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authorMokosha <>2018-10-10 06:44:00 (GMT)
committerhdiff <hdiff@hdiff.luite.com>2018-10-10 06:44:00 (GMT)
commitbb31a06382842cba022ecf7f3ccf05ef4b3e437d (patch)
treeb92a580297fb720a69aa6bb25fed9bbcb724ef69
parent521940ba7e04923a31f20ece583b938ae3f3a639 (diff)
version 0.0.0.30.0.0.3
-rw-r--r--lib/Yoga.hs4
-rw-r--r--yoga.cabal16
-rwxr-xr-xyoga/Utils.cpp70
-rwxr-xr-xyoga/Utils.h148
-rwxr-xr-xyoga/YGConfig.cpp22
-rwxr-xr-xyoga/YGConfig.h24
-rwxr-xr-x[-rw-r--r--]yoga/YGEnums.cpp454
-rwxr-xr-x[-rw-r--r--]yoga/YGEnums.h312
-rwxr-xr-xyoga/YGFloatOptional.cpp84
-rwxr-xr-xyoga/YGFloatOptional.h44
-rwxr-xr-xyoga/YGLayout.cpp63
-rwxr-xr-xyoga/YGLayout.h44
-rwxr-xr-x[-rw-r--r--]yoga/YGMacros.h88
-rwxr-xr-xyoga/YGNode.cpp554
-rwxr-xr-xyoga/YGNode.h273
-rwxr-xr-x[-rw-r--r--]yoga/YGNodePrint.cpp451
-rwxr-xr-x[-rw-r--r--]yoga/YGNodePrint.h46
-rwxr-xr-xyoga/YGStyle.cpp100
-rwxr-xr-x[-rw-r--r--]yoga/Yoga-internal.h350
-rwxr-xr-x[-rw-r--r--]yoga/Yoga.cpp7849
-rwxr-xr-x[-rw-r--r--]yoga/Yoga.h745
21 files changed, 7015 insertions, 4726 deletions
diff --git a/lib/Yoga.hs b/lib/Yoga.hs
index a8ba69f..6310da8 100644
--- a/lib/Yoga.hs
+++ b/lib/Yoga.hs
@@ -476,8 +476,8 @@ foldRenderTree parentInfo (Container x children) ptr f = do
(result, y, cs) <- renderNodeWithChildren parentInfo x children ptr f
return $ (result, Container y cs)
foldRenderTree parentInfo (Leaf x) ptr f = do
- (result, y, []) <- renderNodeWithChildren parentInfo x [] ptr f
- return $ (result, Leaf y)
+ (result, y, cs) <- renderNodeWithChildren parentInfo x [] ptr f
+ return $ cs `seq` (result, Leaf y)
-- | Renders a layout with the user-supplied function. For each return value
-- of type '(b, c)', we append the first result to the output of the previous
diff --git a/yoga.cabal b/yoga.cabal
index 273a1ef..62adbab 100644
--- a/yoga.cabal
+++ b/yoga.cabal
@@ -2,7 +2,7 @@
-- see http://haskell.org/cabal/users-guide/
name: yoga
-version: 0.0.0.2
+version: 0.0.0.3
synopsis: Bindings to Facebook's Yoga layout library
description: The <https://facebook.github.com/yoga Yoga> library from
<https://facebook.github.com/ Facebook> is a fast layout engine
@@ -50,11 +50,23 @@ library
YGNodePrint.h
Yoga.h
Yoga-internal.h
+ YGConfig.h
+ YGFloatOptional.h
+ YGLayout.h
+ YGNode.h
+ Utils.h
+
c-sources: yoga/YGNodePrint.cpp
yoga/Yoga.cpp
yoga/YGEnums.cpp
+ yoga/YGConfig.cpp
+ yoga/YGFloatOptional.cpp
+ yoga/YGLayout.cpp
+ yoga/YGNode.cpp
+ yoga/YGStyle.cpp
+ yoga/Utils.cpp
- cc-options: -Dnullptr=NULL
+ cc-options: -Dnullptr=0
extra-libraries: stdc++
exposed-modules:
diff --git a/yoga/Utils.cpp b/yoga/Utils.cpp
new file mode 100755
index 0000000..fa21a55
--- /dev/null
+++ b/yoga/Utils.cpp
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#include "Utils.h"
+
+using namespace facebook;
+
+YGFlexDirection YGFlexDirectionCross(
+ const YGFlexDirection flexDirection,
+ const YGDirection direction) {
+ return YGFlexDirectionIsColumn(flexDirection)
+ ? YGResolveFlexDirection(YGFlexDirectionRow, direction)
+ : YGFlexDirectionColumn;
+}
+
+float YGFloatMax(const float a, const float b) {
+ if (!yoga::isUndefined(a) && !yoga::isUndefined(b)) {
+ return fmaxf(a, b);
+ }
+ return yoga::isUndefined(a) ? b : a;
+}
+
+float YGFloatMin(const float a, const float b) {
+ if (!yoga::isUndefined(a) && !yoga::isUndefined(b)) {
+ return fminf(a, b);
+ }
+
+ return yoga::isUndefined(a) ? b : a;
+}
+
+bool YGValueEqual(const YGValue a, const YGValue b) {
+ if (a.unit != b.unit) {
+ return false;
+ }
+
+ if (a.unit == YGUnitUndefined ||
+ (yoga::isUndefined(a.value) && yoga::isUndefined(b.value))) {
+ return true;
+ }
+
+ return fabs(a.value - b.value) < 0.0001f;
+}
+
+bool YGFloatsEqual(const float a, const float b) {
+ if (!yoga::isUndefined(a) && !yoga::isUndefined(b)) {
+ return fabs(a - b) < 0.0001f;
+ }
+ return yoga::isUndefined(a) && yoga::isUndefined(b);
+}
+
+float YGFloatSanitize(const float& val) {
+ return yoga::isUndefined(val) ? 0 : val;
+}
+
+float YGUnwrapFloatOptional(const YGFloatOptional& op) {
+ return op.isUndefined() ? YGUndefined : op.getValue();
+}
+
+YGFloatOptional YGFloatOptionalMax(
+ const YGFloatOptional& op1,
+ const YGFloatOptional& op2) {
+ if (!op1.isUndefined() && !op2.isUndefined()) {
+ return op1.getValue() > op2.getValue() ? op1 : op2;
+ }
+ return op1.isUndefined() ? op2 : op1;
+}
diff --git a/yoga/Utils.h b/yoga/Utils.h
new file mode 100755
index 0000000..e538cad
--- /dev/null
+++ b/yoga/Utils.h
@@ -0,0 +1,148 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+#include "YGNode.h"
+#include "Yoga-internal.h"
+
+// This struct is an helper model to hold the data for step 4 of flexbox
+// algo, which is collecting the flex items in a line.
+//
+// - itemsOnLine: Number of items which can fit in a line considering the
+// available Inner dimension, the flex items computed flexbasis and their
+// margin. It may be different than the difference between start and end
+// indicates because we skip over absolute-positioned items.
+//
+// - sizeConsumedOnCurrentLine: It is accumulation of the dimensions and margin
+// of all the children on the current line. This will be used in order to either
+// set the dimensions of the node if none already exist or to compute the
+// remaining space left for the flexible children.
+//
+// - totalFlexGrowFactors: total flex grow factors of flex items which are to be
+// layed in the current line
+//
+// - totalFlexShrinkFactors: total flex shrink factors of flex items which are
+// to be layed in the current line
+//
+// - endOfLineIndex: Its the end index of the last flex item which was examined
+// and it may or may not be part of the current line(as it may be absolutely
+// positioned or inculding it may have caused to overshoot availableInnerDim)
+//
+// - relativeChildren: Maintain a vector of the child nodes that can shrink
+// and/or grow.
+
+struct YGCollectFlexItemsRowValues {
+ uint32_t itemsOnLine;
+ float sizeConsumedOnCurrentLine;
+ float totalFlexGrowFactors;
+ float totalFlexShrinkScaledFactors;
+ uint32_t endOfLineIndex;
+ std::vector<YGNodeRef> relativeChildren;
+ float remainingFreeSpace;
+ // The size of the mainDim for the row after considering size, padding, margin
+ // and border of flex items. This is used to calculate maxLineDim after going
+ // through all the rows to decide on the main axis size of owner.
+ float mainDim;
+ // The size of the crossDim for the row after considering size, padding,
+ // margin and border of flex items. Used for calculating containers crossSize.
+ float crossDim;
+};
+
+bool YGValueEqual(const YGValue a, const YGValue b);
+
+// This custom float equality function returns true if either absolute
+// difference between two floats is less than 0.0001f or both are undefined.
+bool YGFloatsEqual(const float a, const float b);
+
+// We need custom max function, since we want that, if one argument is
+// YGUndefined then the max funtion should return the other argument as the max
+// value. We wouldn't have needed a custom max function if YGUndefined was NAN
+// as fmax has the same behaviour, but with NAN we cannot use `-ffast-math`
+// compiler flag.
+float YGFloatMax(const float a, const float b);
+
+YGFloatOptional YGFloatOptionalMax(
+ const YGFloatOptional& op1,
+ const YGFloatOptional& op2);
+
+// We need custom min function, since we want that, if one argument is
+// YGUndefined then the min funtion should return the other argument as the min
+// value. We wouldn't have needed a custom min function if YGUndefined was NAN
+// as fmin has the same behaviour, but with NAN we cannot use `-ffast-math`
+// compiler flag.
+float YGFloatMin(const float a, const float b);
+
+// This custom float comparision function compares the array of float with
+// YGFloatsEqual, as the default float comparision operator will not work(Look
+// at the comments of YGFloatsEqual function).
+template <std::size_t size>
+bool YGFloatArrayEqual(
+ const std::array<float, size>& val1,
+ const std::array<float, size>& val2) {
+ bool areEqual = true;
+ for (std::size_t i = 0; i < size && areEqual; ++i) {
+ areEqual = YGFloatsEqual(val1[i], val2[i]);
+ }
+ return areEqual;
+}
+
+// This function returns 0 if YGFloatIsUndefined(val) is true and val otherwise
+float YGFloatSanitize(const float& val);
+
+// This function unwraps optional and returns YGUndefined if not defined or
+// op.value otherwise
+// TODO: Get rid off this function
+float YGUnwrapFloatOptional(const YGFloatOptional& op);
+
+YGFlexDirection YGFlexDirectionCross(
+ const YGFlexDirection flexDirection,
+ const YGDirection direction);
+
+inline bool YGFlexDirectionIsRow(const YGFlexDirection flexDirection) {
+ return flexDirection == YGFlexDirectionRow ||
+ flexDirection == YGFlexDirectionRowReverse;
+}
+
+inline YGFloatOptional YGResolveValue(const YGValue value, const float ownerSize) {
+ switch (value.unit) {
+ case YGUnitUndefined:
+ case YGUnitAuto:
+ return YGFloatOptional();
+ case YGUnitPoint:
+ return YGFloatOptional(value.value);
+ case YGUnitPercent:
+ return YGFloatOptional(
+ static_cast<float>(value.value * ownerSize * 0.01));
+ }
+ return YGFloatOptional();
+}
+
+inline bool YGFlexDirectionIsColumn(const YGFlexDirection flexDirection) {
+ return flexDirection == YGFlexDirectionColumn ||
+ flexDirection == YGFlexDirectionColumnReverse;
+}
+
+inline YGFlexDirection YGResolveFlexDirection(
+ const YGFlexDirection flexDirection,
+ const YGDirection direction) {
+ if (direction == YGDirectionRTL) {
+ if (flexDirection == YGFlexDirectionRow) {
+ return YGFlexDirectionRowReverse;
+ } else if (flexDirection == YGFlexDirectionRowReverse) {
+ return YGFlexDirectionRow;
+ }
+ }
+
+ return flexDirection;
+}
+
+static inline YGFloatOptional YGResolveValueMargin(
+ const YGValue value,
+ const float ownerSize) {
+ return value.unit == YGUnitAuto ? YGFloatOptional(0)
+ : YGResolveValue(value, ownerSize);
+}
diff --git a/yoga/YGConfig.cpp b/yoga/YGConfig.cpp
new file mode 100755
index 0000000..646f8d9
--- /dev/null
+++ b/yoga/YGConfig.cpp
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#include "YGConfig.h"
+
+const std::array<bool, YGExperimentalFeatureCount>
+ kYGDefaultExperimentalFeatures = {{false}};
+
+YGConfig::YGConfig(YGLogger logger)
+ : experimentalFeatures(kYGDefaultExperimentalFeatures),
+ useWebDefaults(false),
+ useLegacyStretchBehaviour(false),
+ shouldDiffLayoutWithoutLegacyStretchBehaviour(false),
+ pointScaleFactor(1.0f),
+ logger(logger),
+ cloneNodeCallback(nullptr),
+ context(nullptr),
+ printTree(false) {}
diff --git a/yoga/YGConfig.h b/yoga/YGConfig.h
new file mode 100755
index 0000000..3718133
--- /dev/null
+++ b/yoga/YGConfig.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#pragma once
+#include "Yoga-internal.h"
+#include "Yoga.h"
+
+struct YGConfig {
+ std::array<bool, YGExperimentalFeatureCount> experimentalFeatures;
+ bool useWebDefaults;
+ bool useLegacyStretchBehaviour;
+ bool shouldDiffLayoutWithoutLegacyStretchBehaviour;
+ float pointScaleFactor;
+ YGLogger logger;
+ YGCloneNodeFunc cloneNodeCallback;
+ void* context;
+ bool printTree;
+
+ YGConfig(YGLogger logger);
+};
diff --git a/yoga/YGEnums.cpp b/yoga/YGEnums.cpp
index 7479c75..5f8ef9a 100644..100755
--- a/yoga/YGEnums.cpp
+++ b/yoga/YGEnums.cpp
@@ -1,228 +1,226 @@
-/**
- * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-#include "YGEnums.h"
-
-const char *YGAlignToString(const YGAlign value){
- switch(value){
- case YGAlignAuto:
- return "auto";
- case YGAlignFlexStart:
- return "flex-start";
- case YGAlignCenter:
- return "center";
- case YGAlignFlexEnd:
- return "flex-end";
- case YGAlignStretch:
- return "stretch";
- case YGAlignBaseline:
- return "baseline";
- case YGAlignSpaceBetween:
- return "space-between";
- case YGAlignSpaceAround:
- return "space-around";
- }
- return "unknown";
-}
-
-const char *YGDimensionToString(const YGDimension value){
- switch(value){
- case YGDimensionWidth:
- return "width";
- case YGDimensionHeight:
- return "height";
- }
- return "unknown";
-}
-
-const char *YGDirectionToString(const YGDirection value){
- switch(value){
- case YGDirectionInherit:
- return "inherit";
- case YGDirectionLTR:
- return "ltr";
- case YGDirectionRTL:
- return "rtl";
- }
- return "unknown";
-}
-
-const char *YGDisplayToString(const YGDisplay value){
- switch(value){
- case YGDisplayFlex:
- return "flex";
- case YGDisplayNone:
- return "none";
- }
- return "unknown";
-}
-
-const char *YGEdgeToString(const YGEdge value){
- switch(value){
- case YGEdgeLeft:
- return "left";
- case YGEdgeTop:
- return "top";
- case YGEdgeRight:
- return "right";
- case YGEdgeBottom:
- return "bottom";
- case YGEdgeStart:
- return "start";
- case YGEdgeEnd:
- return "end";
- case YGEdgeHorizontal:
- return "horizontal";
- case YGEdgeVertical:
- return "vertical";
- case YGEdgeAll:
- return "all";
- }
- return "unknown";
-}
-
-const char *YGExperimentalFeatureToString(const YGExperimentalFeature value){
- switch(value){
- case YGExperimentalFeatureWebFlexBasis:
- return "web-flex-basis";
- }
- return "unknown";
-}
-
-const char *YGFlexDirectionToString(const YGFlexDirection value){
- switch(value){
- case YGFlexDirectionColumn:
- return "column";
- case YGFlexDirectionColumnReverse:
- return "column-reverse";
- case YGFlexDirectionRow:
- return "row";
- case YGFlexDirectionRowReverse:
- return "row-reverse";
- }
- return "unknown";
-}
-
-const char *YGJustifyToString(const YGJustify value){
- switch(value){
- case YGJustifyFlexStart:
- return "flex-start";
- case YGJustifyCenter:
- return "center";
- case YGJustifyFlexEnd:
- return "flex-end";
- case YGJustifySpaceBetween:
- return "space-between";
- case YGJustifySpaceAround:
- return "space-around";
- case YGJustifySpaceEvenly:
- return "space-evenly";
- }
- return "unknown";
-}
-
-const char *YGLogLevelToString(const YGLogLevel value){
- switch(value){
- case YGLogLevelError:
- return "error";
- case YGLogLevelWarn:
- return "warn";
- case YGLogLevelInfo:
- return "info";
- case YGLogLevelDebug:
- return "debug";
- case YGLogLevelVerbose:
- return "verbose";
- case YGLogLevelFatal:
- return "fatal";
- }
- return "unknown";
-}
-
-const char *YGMeasureModeToString(const YGMeasureMode value){
- switch(value){
- case YGMeasureModeUndefined:
- return "undefined";
- case YGMeasureModeExactly:
- return "exactly";
- case YGMeasureModeAtMost:
- return "at-most";
- }
- return "unknown";
-}
-
-const char *YGNodeTypeToString(const YGNodeType value){
- switch(value){
- case YGNodeTypeDefault:
- return "default";
- case YGNodeTypeText:
- return "text";
- }
- return "unknown";
-}
-
-const char *YGOverflowToString(const YGOverflow value){
- switch(value){
- case YGOverflowVisible:
- return "visible";
- case YGOverflowHidden:
- return "hidden";
- case YGOverflowScroll:
- return "scroll";
- }
- return "unknown";
-}
-
-const char *YGPositionTypeToString(const YGPositionType value){
- switch(value){
- case YGPositionTypeRelative:
- return "relative";
- case YGPositionTypeAbsolute:
- return "absolute";
- }
- return "unknown";
-}
-
-const char *YGPrintOptionsToString(const YGPrintOptions value){
- switch(value){
- case YGPrintOptionsLayout:
- return "layout";
- case YGPrintOptionsStyle:
- return "style";
- case YGPrintOptionsChildren:
- return "children";
- }
- return "unknown";
-}
-
-const char *YGUnitToString(const YGUnit value){
- switch(value){
- case YGUnitUndefined:
- return "undefined";
- case YGUnitPoint:
- return "point";
- case YGUnitPercent:
- return "percent";
- case YGUnitAuto:
- return "auto";
- }
- return "unknown";
-}
-
-const char *YGWrapToString(const YGWrap value){
- switch(value){
- case YGWrapNoWrap:
- return "no-wrap";
- case YGWrapWrap:
- return "wrap";
- case YGWrapWrapReverse:
- return "wrap-reverse";
- }
- return "unknown";
-}
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "YGEnums.h"
+
+const char *YGAlignToString(const YGAlign value){
+ switch(value){
+ case YGAlignAuto:
+ return "auto";
+ case YGAlignFlexStart:
+ return "flex-start";
+ case YGAlignCenter:
+ return "center";
+ case YGAlignFlexEnd:
+ return "flex-end";
+ case YGAlignStretch:
+ return "stretch";
+ case YGAlignBaseline:
+ return "baseline";
+ case YGAlignSpaceBetween:
+ return "space-between";
+ case YGAlignSpaceAround:
+ return "space-around";
+ }
+ return "unknown";
+}
+
+const char *YGDimensionToString(const YGDimension value){
+ switch(value){
+ case YGDimensionWidth:
+ return "width";
+ case YGDimensionHeight:
+ return "height";
+ }
+ return "unknown";
+}
+
+const char *YGDirectionToString(const YGDirection value){
+ switch(value){
+ case YGDirectionInherit:
+ return "inherit";
+ case YGDirectionLTR:
+ return "ltr";
+ case YGDirectionRTL:
+ return "rtl";
+ }
+ return "unknown";
+}
+
+const char *YGDisplayToString(const YGDisplay value){
+ switch(value){
+ case YGDisplayFlex:
+ return "flex";
+ case YGDisplayNone:
+ return "none";
+ }
+ return "unknown";
+}
+
+const char *YGEdgeToString(const YGEdge value){
+ switch(value){
+ case YGEdgeLeft:
+ return "left";
+ case YGEdgeTop:
+ return "top";
+ case YGEdgeRight:
+ return "right";
+ case YGEdgeBottom:
+ return "bottom";
+ case YGEdgeStart:
+ return "start";
+ case YGEdgeEnd:
+ return "end";
+ case YGEdgeHorizontal:
+ return "horizontal";
+ case YGEdgeVertical:
+ return "vertical";
+ case YGEdgeAll:
+ return "all";
+ }
+ return "unknown";
+}
+
+const char *YGExperimentalFeatureToString(const YGExperimentalFeature value){
+ switch(value){
+ case YGExperimentalFeatureWebFlexBasis:
+ return "web-flex-basis";
+ }
+ return "unknown";
+}
+
+const char *YGFlexDirectionToString(const YGFlexDirection value){
+ switch(value){
+ case YGFlexDirectionColumn:
+ return "column";
+ case YGFlexDirectionColumnReverse:
+ return "column-reverse";
+ case YGFlexDirectionRow:
+ return "row";
+ case YGFlexDirectionRowReverse:
+ return "row-reverse";
+ }
+ return "unknown";
+}
+
+const char *YGJustifyToString(const YGJustify value){
+ switch(value){
+ case YGJustifyFlexStart:
+ return "flex-start";
+ case YGJustifyCenter:
+ return "center";
+ case YGJustifyFlexEnd:
+ return "flex-end";
+ case YGJustifySpaceBetween:
+ return "space-between";
+ case YGJustifySpaceAround:
+ return "space-around";
+ case YGJustifySpaceEvenly:
+ return "space-evenly";
+ }
+ return "unknown";
+}
+
+const char *YGLogLevelToString(const YGLogLevel value){
+ switch(value){
+ case YGLogLevelError:
+ return "error";
+ case YGLogLevelWarn:
+ return "warn";
+ case YGLogLevelInfo:
+ return "info";
+ case YGLogLevelDebug:
+ return "debug";
+ case YGLogLevelVerbose:
+ return "verbose";
+ case YGLogLevelFatal:
+ return "fatal";
+ }
+ return "unknown";
+}
+
+const char *YGMeasureModeToString(const YGMeasureMode value){
+ switch(value){
+ case YGMeasureModeUndefined:
+ return "undefined";
+ case YGMeasureModeExactly:
+ return "exactly";
+ case YGMeasureModeAtMost:
+ return "at-most";
+ }
+ return "unknown";
+}
+
+const char *YGNodeTypeToString(const YGNodeType value){
+ switch(value){
+ case YGNodeTypeDefault:
+ return "default";
+ case YGNodeTypeText:
+ return "text";
+ }
+ return "unknown";
+}
+
+const char *YGOverflowToString(const YGOverflow value){
+ switch(value){
+ case YGOverflowVisible:
+ return "visible";
+ case YGOverflowHidden:
+ return "hidden";
+ case YGOverflowScroll:
+ return "scroll";
+ }
+ return "unknown";
+}
+
+const char *YGPositionTypeToString(const YGPositionType value){
+ switch(value){
+ case YGPositionTypeRelative:
+ return "relative";
+ case YGPositionTypeAbsolute:
+ return "absolute";
+ }
+ return "unknown";
+}
+
+const char *YGPrintOptionsToString(const YGPrintOptions value){
+ switch(value){
+ case YGPrintOptionsLayout:
+ return "layout";
+ case YGPrintOptionsStyle:
+ return "style";
+ case YGPrintOptionsChildren:
+ return "children";
+ }
+ return "unknown";
+}
+
+const char *YGUnitToString(const YGUnit value){
+ switch(value){
+ case YGUnitUndefined:
+ return "undefined";
+ case YGUnitPoint:
+ return "point";
+ case YGUnitPercent:
+ return "percent";
+ case YGUnitAuto:
+ return "auto";
+ }
+ return "unknown";
+}
+
+const char *YGWrapToString(const YGWrap value){
+ switch(value){
+ case YGWrapNoWrap:
+ return "no-wrap";
+ case YGWrapWrap:
+ return "wrap";
+ case YGWrapWrapReverse:
+ return "wrap-reverse";
+ }
+ return "unknown";
+}
diff --git a/yoga/YGEnums.h b/yoga/YGEnums.h
index 113536c..db55528 100644..100755
--- a/yoga/YGEnums.h
+++ b/yoga/YGEnums.h
@@ -1,157 +1,155 @@
-/**
- * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-#pragma once
-
-#include "YGMacros.h"
-
-YG_EXTERN_C_BEGIN
-
-#define YGAlignCount 8
-typedef YG_ENUM_BEGIN(YGAlign) {
- YGAlignAuto,
- YGAlignFlexStart,
- YGAlignCenter,
- YGAlignFlexEnd,
- YGAlignStretch,
- YGAlignBaseline,
- YGAlignSpaceBetween,
- YGAlignSpaceAround,
-} YG_ENUM_END(YGAlign);
-WIN_EXPORT const char *YGAlignToString(const YGAlign value);
-
-#define YGDimensionCount 2
-typedef YG_ENUM_BEGIN(YGDimension) {
- YGDimensionWidth,
- YGDimensionHeight,
-} YG_ENUM_END(YGDimension);
-WIN_EXPORT const char *YGDimensionToString(const YGDimension value);
-
-#define YGDirectionCount 3
-typedef YG_ENUM_BEGIN(YGDirection) {
- YGDirectionInherit,
- YGDirectionLTR,
- YGDirectionRTL,
-} YG_ENUM_END(YGDirection);
-WIN_EXPORT const char *YGDirectionToString(const YGDirection value);
-
-#define YGDisplayCount 2
-typedef YG_ENUM_BEGIN(YGDisplay) {
- YGDisplayFlex,
- YGDisplayNone,
-} YG_ENUM_END(YGDisplay);
-WIN_EXPORT const char *YGDisplayToString(const YGDisplay value);
-
-#define YGEdgeCount 9
-typedef YG_ENUM_BEGIN(YGEdge) {
- YGEdgeLeft,
- YGEdgeTop,
- YGEdgeRight,
- YGEdgeBottom,
- YGEdgeStart,
- YGEdgeEnd,
- YGEdgeHorizontal,
- YGEdgeVertical,
- YGEdgeAll,
-} YG_ENUM_END(YGEdge);
-WIN_EXPORT const char *YGEdgeToString(const YGEdge value);
-
-#define YGExperimentalFeatureCount 1
-typedef YG_ENUM_BEGIN(YGExperimentalFeature) {
- YGExperimentalFeatureWebFlexBasis,
-} YG_ENUM_END(YGExperimentalFeature);
-WIN_EXPORT const char *YGExperimentalFeatureToString(const YGExperimentalFeature value);
-
-#define YGFlexDirectionCount 4
-typedef YG_ENUM_BEGIN(YGFlexDirection) {
- YGFlexDirectionColumn,
- YGFlexDirectionColumnReverse,
- YGFlexDirectionRow,
- YGFlexDirectionRowReverse,
-} YG_ENUM_END(YGFlexDirection);
-WIN_EXPORT const char *YGFlexDirectionToString(const YGFlexDirection value);
-
-#define YGJustifyCount 6
-typedef YG_ENUM_BEGIN(YGJustify){
- YGJustifyFlexStart,
- YGJustifyCenter,
- YGJustifyFlexEnd,
- YGJustifySpaceBetween,
- YGJustifySpaceAround,
- YGJustifySpaceEvenly,
-} YG_ENUM_END(YGJustify);
-WIN_EXPORT const char *YGJustifyToString(const YGJustify value);
-
-#define YGLogLevelCount 6
-typedef YG_ENUM_BEGIN(YGLogLevel) {
- YGLogLevelError,
- YGLogLevelWarn,
- YGLogLevelInfo,
- YGLogLevelDebug,
- YGLogLevelVerbose,
- YGLogLevelFatal,
-} YG_ENUM_END(YGLogLevel);
-WIN_EXPORT const char *YGLogLevelToString(const YGLogLevel value);
-
-#define YGMeasureModeCount 3
-typedef YG_ENUM_BEGIN(YGMeasureMode) {
- YGMeasureModeUndefined,
- YGMeasureModeExactly,
- YGMeasureModeAtMost,
-} YG_ENUM_END(YGMeasureMode);
-WIN_EXPORT const char *YGMeasureModeToString(const YGMeasureMode value);
-
-#define YGNodeTypeCount 2
-typedef YG_ENUM_BEGIN(YGNodeType) {
- YGNodeTypeDefault,
- YGNodeTypeText,
-} YG_ENUM_END(YGNodeType);
-WIN_EXPORT const char *YGNodeTypeToString(const YGNodeType value);
-
-#define YGOverflowCount 3
-typedef YG_ENUM_BEGIN(YGOverflow) {
- YGOverflowVisible,
- YGOverflowHidden,
- YGOverflowScroll,
-} YG_ENUM_END(YGOverflow);
-WIN_EXPORT const char *YGOverflowToString(const YGOverflow value);
-
-#define YGPositionTypeCount 2
-typedef YG_ENUM_BEGIN(YGPositionType) {
- YGPositionTypeRelative,
- YGPositionTypeAbsolute,
-} YG_ENUM_END(YGPositionType);
-WIN_EXPORT const char *YGPositionTypeToString(const YGPositionType value);
-
-#define YGPrintOptionsCount 3
-typedef YG_ENUM_BEGIN(YGPrintOptions) {
- YGPrintOptionsLayout = 1,
- YGPrintOptionsStyle = 2,
- YGPrintOptionsChildren = 4,
-} YG_ENUM_END(YGPrintOptions);
-WIN_EXPORT const char *YGPrintOptionsToString(const YGPrintOptions value);
-
-#define YGUnitCount 4
-typedef YG_ENUM_BEGIN(YGUnit) {
- YGUnitUndefined,
- YGUnitPoint,
- YGUnitPercent,
- YGUnitAuto,
-} YG_ENUM_END(YGUnit);
-WIN_EXPORT const char *YGUnitToString(const YGUnit value);
-
-#define YGWrapCount 3
-typedef YG_ENUM_BEGIN(YGWrap) {
- YGWrapNoWrap,
- YGWrapWrap,
- YGWrapWrapReverse,
-} YG_ENUM_END(YGWrap);
-WIN_EXPORT const char *YGWrapToString(const YGWrap value);
-
-YG_EXTERN_C_END
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include "YGMacros.h"
+
+YG_EXTERN_C_BEGIN
+
+#define YGAlignCount 8
+typedef YG_ENUM_BEGIN(YGAlign) {
+ YGAlignAuto,
+ YGAlignFlexStart,
+ YGAlignCenter,
+ YGAlignFlexEnd,
+ YGAlignStretch,
+ YGAlignBaseline,
+ YGAlignSpaceBetween,
+ YGAlignSpaceAround,
+} YG_ENUM_END(YGAlign);
+WIN_EXPORT const char *YGAlignToString(const YGAlign value);
+
+#define YGDimensionCount 2
+typedef YG_ENUM_BEGIN(YGDimension) {
+ YGDimensionWidth,
+ YGDimensionHeight,
+} YG_ENUM_END(YGDimension);
+WIN_EXPORT const char *YGDimensionToString(const YGDimension value);
+
+#define YGDirectionCount 3
+typedef YG_ENUM_BEGIN(YGDirection) {
+ YGDirectionInherit,
+ YGDirectionLTR,
+ YGDirectionRTL,
+} YG_ENUM_END(YGDirection);
+WIN_EXPORT const char *YGDirectionToString(const YGDirection value);
+
+#define YGDisplayCount 2
+typedef YG_ENUM_BEGIN(YGDisplay) {
+ YGDisplayFlex,
+ YGDisplayNone,
+} YG_ENUM_END(YGDisplay);
+WIN_EXPORT const char *YGDisplayToString(const YGDisplay value);
+
+#define YGEdgeCount 9
+typedef YG_ENUM_BEGIN(YGEdge) {
+ YGEdgeLeft,
+ YGEdgeTop,
+ YGEdgeRight,
+ YGEdgeBottom,
+ YGEdgeStart,
+ YGEdgeEnd,
+ YGEdgeHorizontal,
+ YGEdgeVertical,
+ YGEdgeAll,
+} YG_ENUM_END(YGEdge);
+WIN_EXPORT const char *YGEdgeToString(const YGEdge value);
+
+#define YGExperimentalFeatureCount 1
+typedef YG_ENUM_BEGIN(YGExperimentalFeature) {
+ YGExperimentalFeatureWebFlexBasis,
+} YG_ENUM_END(YGExperimentalFeature);
+WIN_EXPORT const char *YGExperimentalFeatureToString(const YGExperimentalFeature value);
+
+#define YGFlexDirectionCount 4
+typedef YG_ENUM_BEGIN(YGFlexDirection) {
+ YGFlexDirectionColumn,
+ YGFlexDirectionColumnReverse,
+ YGFlexDirectionRow,
+ YGFlexDirectionRowReverse,
+} YG_ENUM_END(YGFlexDirection);
+WIN_EXPORT const char *YGFlexDirectionToString(const YGFlexDirection value);
+
+#define YGJustifyCount 6
+typedef YG_ENUM_BEGIN(YGJustify){
+ YGJustifyFlexStart,
+ YGJustifyCenter,
+ YGJustifyFlexEnd,
+ YGJustifySpaceBetween,
+ YGJustifySpaceAround,
+ YGJustifySpaceEvenly,
+} YG_ENUM_END(YGJustify);
+WIN_EXPORT const char *YGJustifyToString(const YGJustify value);
+
+#define YGLogLevelCount 6
+typedef YG_ENUM_BEGIN(YGLogLevel) {
+ YGLogLevelError,
+ YGLogLevelWarn,
+ YGLogLevelInfo,
+ YGLogLevelDebug,
+ YGLogLevelVerbose,
+ YGLogLevelFatal,
+} YG_ENUM_END(YGLogLevel);
+WIN_EXPORT const char *YGLogLevelToString(const YGLogLevel value);
+
+#define YGMeasureModeCount 3
+typedef YG_ENUM_BEGIN(YGMeasureMode) {
+ YGMeasureModeUndefined,
+ YGMeasureModeExactly,
+ YGMeasureModeAtMost,
+} YG_ENUM_END(YGMeasureMode);
+WIN_EXPORT const char *YGMeasureModeToString(const YGMeasureMode value);
+
+#define YGNodeTypeCount 2
+typedef YG_ENUM_BEGIN(YGNodeType) {
+ YGNodeTypeDefault,
+ YGNodeTypeText,
+} YG_ENUM_END(YGNodeType);
+WIN_EXPORT const char *YGNodeTypeToString(const YGNodeType value);
+
+#define YGOverflowCount 3
+typedef YG_ENUM_BEGIN(YGOverflow) {
+ YGOverflowVisible,
+ YGOverflowHidden,
+ YGOverflowScroll,
+} YG_ENUM_END(YGOverflow);
+WIN_EXPORT const char *YGOverflowToString(const YGOverflow value);
+
+#define YGPositionTypeCount 2
+typedef YG_ENUM_BEGIN(YGPositionType) {
+ YGPositionTypeRelative,
+ YGPositionTypeAbsolute,
+} YG_ENUM_END(YGPositionType);
+WIN_EXPORT const char *YGPositionTypeToString(const YGPositionType value);
+
+#define YGPrintOptionsCount 3
+typedef YG_ENUM_BEGIN(YGPrintOptions) {
+ YGPrintOptionsLayout = 1,
+ YGPrintOptionsStyle = 2,
+ YGPrintOptionsChildren = 4,
+} YG_ENUM_END(YGPrintOptions);
+WIN_EXPORT const char *YGPrintOptionsToString(const YGPrintOptions value);
+
+#define YGUnitCount 4
+typedef YG_ENUM_BEGIN(YGUnit) {
+ YGUnitUndefined,
+ YGUnitPoint,
+ YGUnitPercent,
+ YGUnitAuto,
+} YG_ENUM_END(YGUnit);
+WIN_EXPORT const char *YGUnitToString(const YGUnit value);
+
+#define YGWrapCount 3
+typedef YG_ENUM_BEGIN(YGWrap) {
+ YGWrapNoWrap,
+ YGWrapWrap,
+ YGWrapWrapReverse,
+} YG_ENUM_END(YGWrap);
+WIN_EXPORT const char *YGWrapToString(const YGWrap value);
+
+YG_EXTERN_C_END
diff --git a/yoga/YGFloatOptional.cpp b/yoga/YGFloatOptional.cpp
new file mode 100755
index 0000000..c7ade6a
--- /dev/null
+++ b/yoga/YGFloatOptional.cpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#include "YGFloatOptional.h"
+#include <cstdlib>
+#include <iostream>
+#include "Yoga.h"
+#include "Yoga-internal.h"
+
+using namespace facebook;
+
+YGFloatOptional::YGFloatOptional(float value) {
+ if (yoga::isUndefined(value)) {
+ isUndefined_ = true;
+ value_ = 0;
+ } else {
+ value_ = value;
+ isUndefined_ = false;
+ }
+}
+
+float YGFloatOptional::getValue() const {
+ if (isUndefined_) {
+ // Abort, accessing a value of an undefined float optional
+ std::cerr << "Tried to get value of an undefined YGFloatOptional\n";
+ std::exit(EXIT_FAILURE);
+ }
+ return value_;
+}
+
+bool YGFloatOptional::operator==(const YGFloatOptional& op) const {
+ if (isUndefined_ == op.isUndefined()) {
+ return isUndefined_ || value_ == op.getValue();
+ }
+ return false;
+}
+
+bool YGFloatOptional::operator!=(const YGFloatOptional& op) const {
+ return !(*this == op);
+}
+
+bool YGFloatOptional::operator==(float val) const {
+ if (yoga::isUndefined(val) == isUndefined_) {
+ return isUndefined_ || val == value_;
+ }
+ return false;
+}
+
+bool YGFloatOptional::operator!=(float val) const {
+ return !(*this == val);
+}
+
+YGFloatOptional YGFloatOptional::operator+(const YGFloatOptional& op) {
+ if (!isUndefined_ && !op.isUndefined_) {
+ return YGFloatOptional(value_ + op.value_);
+ }
+ return YGFloatOptional();
+}
+
+bool YGFloatOptional::operator>(const YGFloatOptional& op) const {
+ if (isUndefined_ || op.isUndefined_) {
+ return false;
+ }
+ return value_ > op.value_;
+}
+
+bool YGFloatOptional::operator<(const YGFloatOptional& op) const {
+ if (isUndefined_ || op.isUndefined_) {
+ return false;
+ }
+ return value_ < op.value_;
+}
+
+bool YGFloatOptional::operator>=(const YGFloatOptional& op) const {
+ return *this == op || *this > op;
+}
+
+bool YGFloatOptional::operator<=(const YGFloatOptional& op) const {
+ return *this == op || *this < op;
+}
diff --git a/yoga/YGFloatOptional.h b/yoga/YGFloatOptional.h
new file mode 100755
index 0000000..00acc31
--- /dev/null
+++ b/yoga/YGFloatOptional.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#pragma once
+
+struct YGFloatOptional {
+ private:
+ float value_;
+ bool isUndefined_;
+
+ public:
+ explicit YGFloatOptional(float value);
+ explicit YGFloatOptional() : value_(0), isUndefined_(true) {}
+
+ // Program will terminate if the value of an undefined is accessed. Please
+ // make sure to check if the optional is defined before calling this function.
+ // To check if float optional is defined, use `isUndefined()`.
+ float getValue() const;
+
+ // Sets the value of float optional, and thus isUndefined is assigned false.
+ void setValue(float val) {
+ value_ = val;
+ isUndefined_ = false;
+ }
+
+ bool isUndefined() const {
+ return isUndefined_;
+ }
+
+ YGFloatOptional operator+(const YGFloatOptional& op);
+ bool operator>(const YGFloatOptional& op) const;
+ bool operator<(const YGFloatOptional& op) const;
+ bool operator>=(const YGFloatOptional& op) const;
+ bool operator<=(const YGFloatOptional& op) const;
+ bool operator==(const YGFloatOptional& op) const;
+ bool operator!=(const YGFloatOptional& op) const;
+
+ bool operator==(float val) const;
+ bool operator!=(float val) const;
+};
diff --git a/yoga/YGLayout.cpp b/yoga/YGLayout.cpp
new file mode 100755
index 0000000..fea7015
--- /dev/null
+++ b/yoga/YGLayout.cpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#include "YGLayout.h"
+#include "Utils.h"
+
+using namespace facebook;
+
+const std::array<float, 2> kYGDefaultDimensionValues = {
+ {YGUndefined, YGUndefined}};
+
+YGLayout::YGLayout()
+ : position(),
+ dimensions(kYGDefaultDimensionValues),
+ margin(),
+ border(),
+ padding(),
+ direction(YGDirectionInherit),
+ computedFlexBasisGeneration(0),
+ computedFlexBasis(YGFloatOptional()),
+ hadOverflow(false),
+ generationCount(0),
+ lastOwnerDirection((YGDirection)-1),
+ nextCachedMeasurementsIndex(0),
+ cachedMeasurements(),
+ measuredDimensions(kYGDefaultDimensionValues),
+ cachedLayout(YGCachedMeasurement()),
+ didUseLegacyFlag(false),
+ doesLegacyStretchFlagAffectsLayout(false) {}
+
+bool YGLayout::operator==(YGLayout layout) const {
+ bool isEqual = YGFloatArrayEqual(position, layout.position) &&
+ YGFloatArrayEqual(dimensions, layout.dimensions) &&
+ YGFloatArrayEqual(margin, layout.margin) &&
+ YGFloatArrayEqual(border, layout.border) &&
+ YGFloatArrayEqual(padding, layout.padding) &&
+ direction == layout.direction && hadOverflow == layout.hadOverflow &&
+ lastOwnerDirection == layout.lastOwnerDirection &&
+ nextCachedMeasurementsIndex == layout.nextCachedMeasurementsIndex &&
+ cachedLayout == layout.cachedLayout &&
+ computedFlexBasis == layout.computedFlexBasis;
+
+ for (uint32_t i = 0; i < YG_MAX_CACHED_RESULT_COUNT && isEqual; ++i) {
+ isEqual = isEqual && cachedMeasurements[i] == layout.cachedMeasurements[i];
+ }
+
+ if (!yoga::isUndefined(measuredDimensions[0]) ||
+ !yoga::isUndefined(layout.measuredDimensions[0])) {
+ isEqual =
+ isEqual && (measuredDimensions[0] == layout.measuredDimensions[0]);
+ }
+ if (!yoga::isUndefined(measuredDimensions[1]) ||
+ !yoga::isUndefined(layout.measuredDimensions[1])) {
+ isEqual =
+ isEqual && (measuredDimensions[1] == layout.measuredDimensions[1]);
+ }
+
+ return isEqual;
+}
diff --git a/yoga/YGLayout.h b/yoga/YGLayout.h
new file mode 100755
index 0000000..22f2a1e
--- /dev/null
+++ b/yoga/YGLayout.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#pragma once
+#include "YGFloatOptional.h"
+#include "Yoga-internal.h"
+
+struct YGLayout {
+ std::array<float, 4> position;
+ std::array<float, 2> dimensions;
+ std::array<float, 6> margin;
+ std::array<float, 6> border;
+ std::array<float, 6> padding;
+ YGDirection direction;
+
+ uint32_t computedFlexBasisGeneration;
+ YGFloatOptional computedFlexBasis;
+ bool hadOverflow;
+
+ // Instead of recomputing the entire layout every single time, we
+ // cache some information to break early when nothing changed
+ uint32_t generationCount;
+ YGDirection lastOwnerDirection;
+
+ uint32_t nextCachedMeasurementsIndex;
+ std::array<YGCachedMeasurement, YG_MAX_CACHED_RESULT_COUNT>
+ cachedMeasurements;
+ std::array<float, 2> measuredDimensions;
+
+ YGCachedMeasurement cachedLayout;
+ bool didUseLegacyFlag;
+ bool doesLegacyStretchFlagAffectsLayout;
+
+ YGLayout();
+
+ bool operator==(YGLayout layout) const;
+ bool operator!=(YGLayout layout) const {
+ return !(*this == layout);
+ }
+};
diff --git a/yoga/YGMacros.h b/yoga/YGMacros.h
index 48f257a..0aafdca 100644..100755
--- a/yoga/YGMacros.h
+++ b/yoga/YGMacros.h
@@ -1,47 +1,41 @@
-/**
- * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-#pragma once
-
-#ifdef __cplusplus
-#define YG_EXTERN_C_BEGIN extern "C" {
-#define YG_EXTERN_C_END }
-#else
-#define YG_EXTERN_C_BEGIN
-#define YG_EXTERN_C_END
-#endif
-
-#ifdef _WINDLL
-#define WIN_EXPORT __declspec(dllexport)
-#else
-#define WIN_EXPORT
-#endif
-
-#ifdef WINARMDLL
-#define WIN_STRUCT(type) type *
-#define WIN_STRUCT_REF(value) &value
-#else
-#define WIN_STRUCT(type) type
-#define WIN_STRUCT_REF(value) value
-#endif
-
-#ifndef FB_ASSERTIONS_ENABLED
-#define FB_ASSERTIONS_ENABLED 1
-#endif
-
-#ifdef NS_ENUM
-// Cannot use NSInteger as NSInteger has a different size than int (which is the default type of a
-// enum).
-// Therefor when linking the Yoga C library into obj-c the header is a missmatch for the Yoga ABI.
-#define YG_ENUM_BEGIN(name) NS_ENUM(int, name)
-#define YG_ENUM_END(name)
-#else
-#define YG_ENUM_BEGIN(name) enum name
-#define YG_ENUM_END(name) name
-#endif
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+#define YG_EXTERN_C_BEGIN extern "C" {
+#define YG_EXTERN_C_END }
+#else
+#define YG_EXTERN_C_BEGIN
+#define YG_EXTERN_C_END
+#endif
+
+#ifdef _WINDLL
+#define WIN_EXPORT __declspec(dllexport)
+#else
+#define WIN_EXPORT
+#endif
+
+#ifdef WINARMDLL
+#define WIN_STRUCT(type) type *
+#define WIN_STRUCT_REF(value) &value
+#else
+#define WIN_STRUCT(type) type
+#define WIN_STRUCT_REF(value) value
+#endif
+
+#ifdef NS_ENUM
+// Cannot use NSInteger as NSInteger has a different size than int (which is the default type of a
+// enum).
+// Therefor when linking the Yoga C library into obj-c the header is a missmatch for the Yoga ABI.
+#define YG_ENUM_BEGIN(name) NS_ENUM(int, name)
+#define YG_ENUM_END(name)
+#else
+#define YG_ENUM_BEGIN(name) enum name
+#define YG_ENUM_END(name) name
+#endif
diff --git a/yoga/YGNode.cpp b/yoga/YGNode.cpp
new file mode 100755
index 0000000..987474d
--- /dev/null
+++ b/yoga/YGNode.cpp
@@ -0,0 +1,554 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#include "YGNode.h"
+#include <iostream>
+#include "Utils.h"
+
+using namespace facebook;
+
+YGFloatOptional YGNode::getLeadingPosition(
+ const YGFlexDirection& axis,
+ const float& axisSize) const {
+ if (YGFlexDirectionIsRow(axis)) {
+ const YGValue* leadingPosition =
+ YGComputedEdgeValue(style_.position, YGEdgeStart, &YGValueUndefined);
+ if (leadingPosition->unit != YGUnitUndefined) {
+ return YGResolveValue(*leadingPosition, axisSize);
+ }
+ }
+
+ const YGValue* leadingPosition =
+ YGComputedEdgeValue(style_.position, leading[axis], &YGValueUndefined);
+
+ return leadingPosition->unit == YGUnitUndefined
+ ? YGFloatOptional(0)
+ : YGResolveValue(*leadingPosition, axisSize);
+}
+
+YGFloatOptional YGNode::getTrailingPosition(
+ const YGFlexDirection& axis,
+ const float& axisSize) const {
+ if (YGFlexDirectionIsRow(axis)) {
+ const YGValue* trailingPosition =
+ YGComputedEdgeValue(style_.position, YGEdgeEnd, &YGValueUndefined);
+ if (trailingPosition->unit != YGUnitUndefined) {
+ return YGResolveValue(*trailingPosition, axisSize);
+ }
+ }
+
+ const YGValue* trailingPosition =
+ YGComputedEdgeValue(style_.position, trailing[axis], &YGValueUndefined);
+
+ return trailingPosition->unit == YGUnitUndefined
+ ? YGFloatOptional(0)
+ : YGResolveValue(*trailingPosition, axisSize);
+}
+
+bool YGNode::isLeadingPositionDefined(const YGFlexDirection& axis) const {
+ return (YGFlexDirectionIsRow(axis) &&
+ YGComputedEdgeValue(style_.position, YGEdgeStart, &YGValueUndefined)
+ ->unit != YGUnitUndefined) ||
+ YGComputedEdgeValue(style_.position, leading[axis], &YGValueUndefined)
+ ->unit != YGUnitUndefined;
+}
+
+bool YGNode::isTrailingPosDefined(const YGFlexDirection& axis) const {
+ return (YGFlexDirectionIsRow(axis) &&
+ YGComputedEdgeValue(style_.position, YGEdgeEnd, &YGValueUndefined)
+ ->unit != YGUnitUndefined) ||
+ YGComputedEdgeValue(style_.position, trailing[axis], &YGValueUndefined)
+ ->unit != YGUnitUndefined;
+}
+
+YGFloatOptional YGNode::getLeadingMargin(
+ const YGFlexDirection& axis,
+ const float& widthSize) const {
+ if (YGFlexDirectionIsRow(axis) &&
+ style_.margin[YGEdgeStart].unit != YGUnitUndefined) {
+ return YGResolveValueMargin(style_.margin[YGEdgeStart], widthSize);
+ }
+
+ return YGResolveValueMargin(
+ *YGComputedEdgeValue(style_.margin, leading[axis], &YGValueZero),
+ widthSize);
+}
+
+YGFloatOptional YGNode::getTrailingMargin(
+ const YGFlexDirection& axis,
+ const float& widthSize) const {
+ if (YGFlexDirectionIsRow(axis) &&
+ style_.margin[YGEdgeEnd].unit != YGUnitUndefined) {
+ return YGResolveValueMargin(style_.margin[YGEdgeEnd], widthSize);
+ }
+
+ return YGResolveValueMargin(
+ *YGComputedEdgeValue(style_.margin, trailing[axis], &YGValueZero),
+ widthSize);
+}
+
+YGFloatOptional YGNode::getMarginForAxis(
+ const YGFlexDirection& axis,
+ const float& widthSize) const {
+ return getLeadingMargin(axis, widthSize) + getTrailingMargin(axis, widthSize);
+}
+
+// Setters
+
+void YGNode::setMeasureFunc(YGMeasureFunc measureFunc) {
+ if (measureFunc == nullptr) {
+ measure_ = nullptr;
+ // TODO: t18095186 Move nodeType to opt-in function and mark appropriate
+ // places in Litho
+ nodeType_ = YGNodeTypeDefault;
+ } else {
+ YGAssertWithNode(
+ this,
+ children_.size() == 0,
+ "Cannot set measure function: Nodes with measure functions cannot have children.");
+ measure_ = measureFunc;
+ // TODO: t18095186 Move nodeType to opt-in function and mark appropriate
+ // places in Litho
+ setNodeType(YGNodeTypeText);
+ }
+
+ measure_ = measureFunc;
+}
+
+void YGNode::replaceChild(YGNodeRef child, uint32_t index) {
+ children_[index] = child;
+}
+
+void YGNode::replaceChild(YGNodeRef oldChild, YGNodeRef newChild) {
+ std::replace(children_.begin(), children_.end(), oldChild, newChild);
+}
+
+void YGNode::insertChild(YGNodeRef child, uint32_t index) {
+ children_.insert(children_.begin() + index, child);
+}
+
+void YGNode::setDirty(bool isDirty) {
+ if (isDirty == isDirty_) {
+ return;
+ }
+ isDirty_ = isDirty;
+ if (isDirty && dirtied_) {
+ dirtied_(this);
+ }
+}
+
+bool YGNode::removeChild(YGNodeRef child) {
+ std::vector<YGNodeRef>::iterator p =
+ std::find(children_.begin(), children_.end(), child);
+ if (p != children_.end()) {
+ children_.erase(p);
+ return true;
+ }
+ return false;
+}
+
+void YGNode::removeChild(uint32_t index) {
+ children_.erase(children_.begin() + index);
+}
+
+void YGNode::setLayoutDirection(YGDirection direction) {
+ layout_.direction = direction;
+}
+
+void YGNode::setLayoutMargin(float margin, int index) {
+ layout_.margin[index] = margin;
+}
+
+void YGNode::setLayoutBorder(float border, int index) {
+ layout_.border[index] = border;
+}
+
+void YGNode::setLayoutPadding(float padding, int index) {
+ layout_.padding[index] = padding;
+}
+
+void YGNode::setLayoutLastOwnerDirection(YGDirection direction) {
+ layout_.lastOwnerDirection = direction;
+}
+
+void YGNode::setLayoutComputedFlexBasis(
+ const YGFloatOptional& computedFlexBasis) {
+ layout_.computedFlexBasis = computedFlexBasis;
+}
+
+void YGNode::setLayoutPosition(float position, int index) {
+ layout_.position[index] = position;
+}
+
+void YGNode::setLayoutComputedFlexBasisGeneration(
+ uint32_t computedFlexBasisGeneration) {
+ layout_.computedFlexBasisGeneration = computedFlexBasisGeneration;
+}
+
+void YGNode::setLayoutMeasuredDimension(float measuredDimension, int index) {
+ layout_.measuredDimensions[index] = measuredDimension;
+}
+
+void YGNode::setLayoutHadOverflow(bool hadOverflow) {
+ layout_.hadOverflow = hadOverflow;
+}
+
+void YGNode::setLayoutDimension(float dimension, int index) {
+ layout_.dimensions[index] = dimension;
+}
+
+// If both left and right are defined, then use left. Otherwise return
+// +left or -right depending on which is defined.
+YGFloatOptional YGNode::relativePosition(
+ const YGFlexDirection& axis,
+ const float& axisSize) const {
+ if (isLeadingPositionDefined(axis)) {
+ return getLeadingPosition(axis, axisSize);
+ }
+
+ YGFloatOptional trailingPosition = getTrailingPosition(axis, axisSize);
+ if (!trailingPosition.isUndefined()) {
+ trailingPosition.setValue(-1 * trailingPosition.getValue());
+ }
+ return trailingPosition;
+}
+
+void YGNode::setPosition(
+ const YGDirection direction,
+ const float mainSize,
+ const float crossSize,
+ const float ownerWidth) {
+ /* Root nodes should be always layouted as LTR, so we don't return negative
+ * values. */
+ const YGDirection directionRespectingRoot =
+ owner_ != nullptr ? direction : YGDirectionLTR;
+ const YGFlexDirection mainAxis =
+ YGResolveFlexDirection(style_.flexDirection, directionRespectingRoot);
+ const YGFlexDirection crossAxis =
+ YGFlexDirectionCross(mainAxis, directionRespectingRoot);
+
+ const YGFloatOptional relativePositionMain =
+ relativePosition(mainAxis, mainSize);
+ const YGFloatOptional relativePositionCross =
+ relativePosition(crossAxis, crossSize);
+
+ setLayoutPosition(
+ YGUnwrapFloatOptional(
+ getLeadingMargin(mainAxis, ownerWidth) + relativePositionMain),
+ leading[mainAxis]);
+ setLayoutPosition(
+ YGUnwrapFloatOptional(
+ getTrailingMargin(mainAxis, ownerWidth) + relativePositionMain),
+ trailing[mainAxis]);
+ setLayoutPosition(
+ YGUnwrapFloatOptional(
+ getLeadingMargin(crossAxis, ownerWidth) + relativePositionCross),
+ leading[crossAxis]);
+ setLayoutPosition(
+ YGUnwrapFloatOptional(
+ getTrailingMargin(crossAxis, ownerWidth) + relativePositionCross),
+ trailing[crossAxis]);
+}
+
+YGNode& YGNode::operator=(const YGNode& node) {
+ if (&node == this) {
+ return *this;
+ }
+
+ for (auto child : children_) {
+ delete child;
+ }
+
+ context_ = node.getContext();
+ print_ = node.getPrintFunc();
+ hasNewLayout_ = node.getHasNewLayout();
+ nodeType_ = node.getNodeType();
+ measure_ = node.getMeasure();
+ baseline_ = node.getBaseline();
+ dirtied_ = node.getDirtied();
+ style_ = node.style_;
+ layout_ = node.layout_;
+ lineIndex_ = node.getLineIndex();
+ owner_ = node.getOwner();
+ children_ = node.getChildren();
+ config_ = node.getConfig();
+ isDirty_ = node.isDirty();
+ resolvedDimensions_ = node.getResolvedDimensions();
+
+ return *this;
+}
+
+YGValue YGNode::marginLeadingValue(const YGFlexDirection axis) const {
+ if (YGFlexDirectionIsRow(axis) &&
+ style_.margin[YGEdgeStart].unit != YGUnitUndefined) {
+ return style_.margin[YGEdgeStart];
+ } else {
+ return style_.margin[leading[axis]];
+ }
+}
+
+YGValue YGNode::marginTrailingValue(const YGFlexDirection axis) const {
+ if (YGFlexDirectionIsRow(axis) &&
+ style_.margin[YGEdgeEnd].unit != YGUnitUndefined) {
+ return style_.margin[YGEdgeEnd];
+ } else {
+ return style_.margin[trailing[axis]];
+ }
+}
+
+YGValue YGNode::resolveFlexBasisPtr() const {
+ YGValue flexBasis = style_.flexBasis;
+ if (flexBasis.unit != YGUnitAuto && flexBasis.unit != YGUnitUndefined) {
+ return flexBasis;
+ }
+ if (!style_.flex.isUndefined() && style_.flex.getValue() > 0.0f) {
+ return config_->useWebDefaults ? YGValueAuto : YGValueZero;
+ }
+ return YGValueAuto;
+}
+
+void YGNode::resolveDimension() {
+ for (uint32_t dim = YGDimensionWidth; dim < YGDimensionCount; dim++) {
+ if (getStyle().maxDimensions[dim].unit != YGUnitUndefined &&
+ YGValueEqual(
+ getStyle().maxDimensions[dim], style_.minDimensions[dim])) {
+ resolvedDimensions_[dim] = style_.maxDimensions[dim];
+ } else {
+ resolvedDimensions_[dim] = style_.dimensions[dim];
+ }
+ }
+}
+
+YGDirection YGNode::resolveDirection(const YGDirection ownerDirection) {
+ if (style_.direction == YGDirectionInherit) {
+ return ownerDirection > YGDirectionInherit ? ownerDirection
+ : YGDirectionLTR;
+ } else {
+ return style_.direction;
+ }
+}
+
+void YGNode::clearChildren() {
+ children_.clear();
+ children_.shrink_to_fit();
+}
+
+// Other Methods
+
+void YGNode::cloneChildrenIfNeeded() {
+ // YGNodeRemoveChild in yoga.cpp has a forked variant of this algorithm
+ // optimized for deletions.
+
+ const uint32_t childCount = static_cast<uint32_t>(children_.size());
+ if (childCount == 0) {
+ // This is an empty set. Nothing to clone.
+ return;
+ }
+
+ const YGNodeRef firstChild = children_.front();
+ if (firstChild->getOwner() == this) {
+ // If the first child has this node as its owner, we assume that it is
+ // already unique. We can do this because if we have it has a child, that
+ // means that its owner was at some point cloned which made that subtree
+ // immutable. We also assume that all its sibling are cloned as well.
+ return;
+ }
+
+ const YGCloneNodeFunc cloneNodeCallback = config_->cloneNodeCallback;
+ for (uint32_t i = 0; i < childCount; ++i) {
+ const YGNodeRef oldChild = children_[i];
+ YGNodeRef newChild = nullptr;
+ if (cloneNodeCallback) {
+ newChild = cloneNodeCallback(oldChild, this, i);
+ }
+ if (newChild == nullptr) {
+ newChild = YGNodeClone(oldChild);
+ }
+ replaceChild(newChild, i);
+ newChild->setOwner(this);
+ }
+}
+
+void YGNode::markDirtyAndPropogate() {
+ if (!isDirty_) {
+ setDirty(true);
+ setLayoutComputedFlexBasis(YGFloatOptional());
+ if (owner_) {
+ owner_->markDirtyAndPropogate();
+ }
+ }
+}
+
+void YGNode::markDirtyAndPropogateDownwards() {
+ isDirty_ = true;
+ for_each(children_.begin(), children_.end(), [](YGNodeRef childNode) {
+ childNode->markDirtyAndPropogateDownwards();
+ });
+}
+
+float YGNode::resolveFlexGrow() {
+ // Root nodes flexGrow should always be 0
+ if (owner_ == nullptr) {
+ return 0.0;
+ }
+ if (!style_.flexGrow.isUndefined()) {
+ return style_.flexGrow.getValue();
+ }
+ if (!style_.flex.isUndefined() && style_.flex.getValue() > 0.0f) {
+ return style_.flex.getValue();
+ }
+ return kDefaultFlexGrow;
+}
+
+float YGNode::resolveFlexShrink() {
+ if (owner_ == nullptr) {
+ return 0.0;
+ }
+ if (!style_.flexShrink.isUndefined()) {
+ return style_.flexShrink.getValue();
+ }
+ if (!config_->useWebDefaults && !style_.flex.isUndefined() &&
+ style_.flex.getValue() < 0.0f) {
+ return -style_.flex.getValue();
+ }
+ return config_->useWebDefaults ? kWebDefaultFlexShrink : kDefaultFlexShrink;
+}
+
+bool YGNode::isNodeFlexible() {
+ return (
+ (style_.positionType == YGPositionTypeRelative) &&
+ (resolveFlexGrow() != 0 || resolveFlexShrink() != 0));
+}
+
+float YGNode::getLeadingBorder(const YGFlexDirection& axis) const {
+ if (YGFlexDirectionIsRow(axis) &&
+ style_.border[YGEdgeStart].unit != YGUnitUndefined &&
+ !yoga::isUndefined(style_.border[YGEdgeStart].value) &&
+ style_.border[YGEdgeStart].value >= 0.0f) {
+ return style_.border[YGEdgeStart].value;
+ }
+
+ float computedEdgeValue =
+ YGComputedEdgeValue(style_.border, leading[axis], &YGValueZero)->value;
+ return YGFloatMax(computedEdgeValue, 0.0f);
+}
+
+float YGNode::getTrailingBorder(const YGFlexDirection& flexDirection) const {
+ if (YGFlexDirectionIsRow(flexDirection) &&
+ style_.border[YGEdgeEnd].unit != YGUnitUndefined &&
+ !yoga::isUndefined(style_.border[YGEdgeEnd].value) &&
+ style_.border[YGEdgeEnd].value >= 0.0f) {
+ return style_.border[YGEdgeEnd].value;
+ }
+
+ float computedEdgeValue =
+ YGComputedEdgeValue(style_.border, trailing[flexDirection], &YGValueZero)
+ ->value;
+ return YGFloatMax(computedEdgeValue, 0.0f);
+}
+
+YGFloatOptional YGNode::getLeadingPadding(
+ const YGFlexDirection& axis,
+ const float& widthSize) const {
+ const YGFloatOptional& paddingEdgeStart =
+ YGResolveValue(style_.padding[YGEdgeStart], widthSize);
+ if (YGFlexDirectionIsRow(axis) &&
+ style_.padding[YGEdgeStart].unit != YGUnitUndefined &&
+ !paddingEdgeStart.isUndefined() && paddingEdgeStart.getValue() > 0.0f) {
+ return paddingEdgeStart;
+ }
+
+ YGFloatOptional resolvedValue = YGResolveValue(
+ *YGComputedEdgeValue(style_.padding, leading[axis], &YGValueZero),
+ widthSize);
+ return YGFloatOptionalMax(resolvedValue, YGFloatOptional(0.0f));
+}
+
+YGFloatOptional YGNode::getTrailingPadding(
+ const YGFlexDirection& axis,
+ const float& widthSize) const {
+ if (YGFlexDirectionIsRow(axis) &&
+ style_.padding[YGEdgeEnd].unit != YGUnitUndefined &&
+ !YGResolveValue(style_.padding[YGEdgeEnd], widthSize).isUndefined() &&
+ YGResolveValue(style_.padding[YGEdgeEnd], widthSize).getValue() >= 0.0f) {
+ return YGResolveValue(style_.padding[YGEdgeEnd], widthSize);
+ }
+
+ YGFloatOptional resolvedValue = YGResolveValue(
+ *YGComputedEdgeValue(style_.padding, trailing[axis], &YGValueZero),
+ widthSize);
+
+ return YGFloatOptionalMax(resolvedValue, YGFloatOptional(0.0f));
+}
+
+YGFloatOptional YGNode::getLeadingPaddingAndBorder(
+ const YGFlexDirection& axis,
+ const float& widthSize) const {
+ return getLeadingPadding(axis, widthSize) +
+ YGFloatOptional(getLeadingBorder(axis));
+}
+
+YGFloatOptional YGNode::getTrailingPaddingAndBorder(
+ const YGFlexDirection& axis,
+ const float& widthSize) const {
+ return getTrailingPadding(axis, widthSize) +
+ YGFloatOptional(getTrailingBorder(axis));
+}
+
+bool YGNode::didUseLegacyFlag() {
+ bool didUseLegacyFlag = layout_.didUseLegacyFlag;
+ if (didUseLegacyFlag) {
+ return true;
+ }
+ for (const auto& child : children_) {
+ if (child->layout_.didUseLegacyFlag) {
+ didUseLegacyFlag = true;
+ break;
+ }
+ }
+ return didUseLegacyFlag;
+}
+
+void YGNode::setAndPropogateUseLegacyFlag(bool useLegacyFlag) {
+ config_->useLegacyStretchBehaviour = useLegacyFlag;
+ for_each(children_.begin(), children_.end(), [=](YGNodeRef childNode) {
+ childNode->getConfig()->useLegacyStretchBehaviour = useLegacyFlag;
+ });
+}
+
+void YGNode::setLayoutDoesLegacyFlagAffectsLayout(
+ bool doesLegacyFlagAffectsLayout) {
+ layout_.doesLegacyStretchFlagAffectsLayout = doesLegacyFlagAffectsLayout;
+}
+
+void YGNode::setLayoutDidUseLegacyFlag(bool didUseLegacyFlag) {
+ layout_.didUseLegacyFlag = didUseLegacyFlag;
+}
+
+bool YGNode::isLayoutTreeEqualToNode(const YGNode& node) const {
+ if (children_.size() != node.children_.size()) {
+ return false;
+ }
+ if (layout_ != node.layout_) {
+ return false;
+ }
+ if (children_.size() == 0) {
+ return true;
+ }
+
+ bool isLayoutTreeEqual = true;
+ YGNodeRef otherNodeChildren = nullptr;
+ for (std::vector<YGNodeRef>::size_type i = 0; i < children_.size(); ++i) {
+ otherNodeChildren = node.children_[i];
+ isLayoutTreeEqual =
+ children_[i]->isLayoutTreeEqualToNode(*otherNodeChildren);
+ if (!isLayoutTreeEqual) {
+ return false;
+ }
+ }
+ return isLayoutTreeEqual;
+}
diff --git a/yoga/YGNode.h b/yoga/YGNode.h
new file mode 100755
index 0000000..d771aad
--- /dev/null
+++ b/yoga/YGNode.h
@@ -0,0 +1,273 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#pragma once
+#include <stdio.h>
+#include "YGConfig.h"
+#include "YGLayout.h"
+#include "YGStyle.h"
+#include "Yoga-internal.h"
+
+struct YGNode {
+ private:
+ void* context_ = nullptr;
+ YGPrintFunc print_ = nullptr;
+ bool hasNewLayout_ = true;
+ YGNodeType nodeType_ = YGNodeTypeDefault;
+ YGMeasureFunc measure_ = nullptr;
+ YGBaselineFunc baseline_ = nullptr;
+ YGDirtiedFunc dirtied_ = nullptr;
+ YGStyle style_ = {};
+ YGLayout layout_ = {};
+ uint32_t lineIndex_ = 0;
+ YGNodeRef owner_ = nullptr;
+ YGVector children_ = {};
+ YGConfigRef config_ = nullptr;
+ bool isDirty_ = false;
+ std::array<YGValue, 2> resolvedDimensions_ = {
+ {YGValueUndefined, YGValueUndefined}};
+
+ YGFloatOptional relativePosition(
+ const YGFlexDirection& axis,
+ const float& axisSize) const;
+
+ public:
+ YGNode() = default;
+ ~YGNode() = default; // cleanup of owner/children relationships in YGNodeFree
+ explicit YGNode(const YGConfigRef newConfig) : config_(newConfig){};
+ YGNode(const YGNode& node) = default;
+ YGNode& operator=(const YGNode& node);
+
+ // Getters
+ void* getContext() const {
+ return context_;
+ }
+
+ YGPrintFunc getPrintFunc() const {
+ return print_;
+ }
+
+ bool getHasNewLayout() const {
+ return hasNewLayout_;
+ }
+
+ YGNodeType getNodeType() const {
+ return nodeType_;
+ }
+
+ YGMeasureFunc getMeasure() const {
+ return measure_;
+ }
+
+ YGBaselineFunc getBaseline() const {
+ return baseline_;
+ }
+
+ YGDirtiedFunc getDirtied() const {
+ return dirtied_;
+ }
+
+ // For Performance reasons passing as reference.
+ YGStyle& getStyle() {
+ return style_;
+ }
+
+ const YGStyle& getStyle() const {
+ return style_;
+ }
+
+ // For Performance reasons passing as reference.
+ YGLayout& getLayout() {
+ return layout_;
+ }
+
+ const YGLayout& getLayout() const {
+ return layout_;
+ }
+
+ uint32_t getLineIndex() const {
+ return lineIndex_;
+ }
+
+ // returns the YGNodeRef that owns this YGNode. An owner is used to identify
+ // the YogaTree that a YGNode belongs to.
+ // This method will return the parent of the YGNode when a YGNode only belongs
+ // to one YogaTree or nullptr when the YGNode is shared between two or more
+ // YogaTrees.
+ YGNodeRef getOwner() const {
+ return owner_;
+ }
+
+ // Deprecated, use getOwner() instead.
+ YGNodeRef getParent() const {
+ return getOwner();
+ }
+
+ const YGVector& getChildren() const {
+ return children_;
+ }
+
+ YGNodeRef getChild(uint32_t index) const {
+ return children_.at(index);
+ }
+
+ YGConfigRef getConfig() const {
+ return config_;
+ }
+
+ bool isDirty() const {
+ return isDirty_;
+ }
+
+ std::array<YGValue, 2> getResolvedDimensions() const {
+ return resolvedDimensions_;
+ }
+
+ YGValue getResolvedDimension(int index) const {
+ return resolvedDimensions_[index];
+ }
+
+ // Methods related to positions, margin, padding and border
+ YGFloatOptional getLeadingPosition(
+ const YGFlexDirection& axis,
+ const float& axisSize) const;
+ bool isLeadingPositionDefined(const YGFlexDirection& axis) const;
+ bool isTrailingPosDefined(const YGFlexDirection& axis) const;
+ YGFloatOptional getTrailingPosition(
+ const YGFlexDirection& axis,
+ const float& axisSize) const;
+ YGFloatOptional getLeadingMargin(
+ const YGFlexDirection& axis,
+ const float& widthSize) const;
+ YGFloatOptional getTrailingMargin(
+ const YGFlexDirection& axis,
+ const float& widthSize) const;
+ float getLeadingBorder(const YGFlexDirection& flexDirection) const;
+ float getTrailingBorder(const YGFlexDirection& flexDirection) const;
+ YGFloatOptional getLeadingPadding(
+ const YGFlexDirection& axis,
+ const float& widthSize) const;
+ YGFloatOptional getTrailingPadding(
+ const YGFlexDirection& axis,
+ const float& widthSize) const;
+ YGFloatOptional getLeadingPaddingAndBorder(
+ const YGFlexDirection& axis,
+ const float& widthSize) const;
+ YGFloatOptional getTrailingPaddingAndBorder(
+ const YGFlexDirection& axis,
+ const float& widthSize) const;
+ YGFloatOptional getMarginForAxis(
+ const YGFlexDirection& axis,
+ const float& widthSize) const;
+ // Setters
+
+ void setContext(void* context) {
+ context_ = context;
+ }
+
+ void setPrintFunc(YGPrintFunc printFunc) {
+ print_ = printFunc;
+ }
+
+ void setHasNewLayout(bool hasNewLayout) {
+ hasNewLayout_ = hasNewLayout;
+ }
+
+ void setNodeType(YGNodeType nodeType) {
+ nodeType_ = nodeType;
+ }
+
+ void setStyleFlexDirection(YGFlexDirection direction) {
+ style_.flexDirection = direction;
+ }
+
+ void setStyleAlignContent(YGAlign alignContent) {
+ style_.alignContent = alignContent;
+ }
+
+ void setMeasureFunc(YGMeasureFunc measureFunc);
+
+ void setBaseLineFunc(YGBaselineFunc baseLineFunc) {
+ baseline_ = baseLineFunc;
+ }
+
+ void setDirtiedFunc(YGDirtiedFunc dirtiedFunc) {
+ dirtied_ = dirtiedFunc;
+ }
+
+ void setStyle(const YGStyle& style) {
+ style_ = style;
+ }
+
+ void setLayout(const YGLayout& layout) {
+ layout_ = layout;
+ }
+
+ void setLineIndex(uint32_t lineIndex) {
+ lineIndex_ = lineIndex;
+ }
+
+ void setOwner(YGNodeRef owner) {
+ owner_ = owner;
+ }
+
+ void setChildren(const YGVector& children) {
+ children_ = children;
+ }
+
+ // TODO: rvalue override for setChildren
+
+ void setConfig(YGConfigRef config) {
+ config_ = config;
+ }
+
+ void setDirty(bool isDirty);
+ void setLayoutLastOwnerDirection(YGDirection direction);
+ void setLayoutComputedFlexBasis(const YGFloatOptional& computedFlexBasis);
+ void setLayoutComputedFlexBasisGeneration(
+ uint32_t computedFlexBasisGeneration);
+ void setLayoutMeasuredDimension(float measuredDimension, int index);
+ void setLayoutHadOverflow(bool hadOverflow);
+ void setLayoutDimension(float dimension, int index);
+ void setLayoutDirection(YGDirection direction);
+ void setLayoutMargin(float margin, int index);
+ void setLayoutBorder(float border, int index);
+ void setLayoutPadding(float padding, int index);
+ void setLayoutPosition(float position, int index);
+ void setPosition(
+ const YGDirection direction,
+ const float mainSize,
+ const float crossSize,
+ const float ownerWidth);
+ void setAndPropogateUseLegacyFlag(bool useLegacyFlag);
+ void setLayoutDoesLegacyFlagAffectsLayout(bool doesLegacyFlagAffectsLayout);
+ void setLayoutDidUseLegacyFlag(bool didUseLegacyFlag);
+ void markDirtyAndPropogateDownwards();
+
+ // Other methods
+ YGValue marginLeadingValue(const YGFlexDirection axis) const;
+ YGValue marginTrailingValue(const YGFlexDirection axis) const;
+ YGValue resolveFlexBasisPtr() const;
+ void resolveDimension();
+ YGDirection resolveDirection(const YGDirection ownerDirection);
+ void clearChildren();
+ /// Replaces the occurrences of oldChild with newChild
+ void replaceChild(YGNodeRef oldChild, YGNodeRef newChild);
+ void replaceChild(YGNodeRef child, uint32_t index);
+ void insertChild(YGNodeRef child, uint32_t index);
+ /// Removes the first occurrence of child
+ bool removeChild(YGNodeRef child);
+ void removeChild(uint32_t index);
+
+ void cloneChildrenIfNeeded();
+ void markDirtyAndPropogate();
+ float resolveFlexGrow();
+ float resolveFlexShrink();
+ bool isNodeFlexible();
+ bool didUseLegacyFlag();
+ bool isLayoutTreeEqualToNode(const YGNode& node) const;
+};
diff --git a/yoga/YGNodePrint.cpp b/yoga/YGNodePrint.cpp
index 38fd80e..cd11bec 100644..100755
--- a/yoga/YGNodePrint.cpp
+++ b/yoga/YGNodePrint.cpp
@@ -1,220 +1,231 @@
-/*
- * Copyright (c) 2017-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-#include "YGNodePrint.h"
-#include <stdarg.h>
-#include "YGEnums.h"
-#include "Yoga-internal.h"
-
-namespace facebook {
-namespace yoga {
-typedef std::string string;
-
-static void indent(string* base, uint32_t level) {
- for (uint32_t i = 0; i < level; ++i) {
- base->append(" ");
- }
-}
-
-static bool areFourValuesEqual(const YGValue four[4]) {
- return YGValueEqual(four[0], four[1]) && YGValueEqual(four[0], four[2]) &&
- YGValueEqual(four[0], four[3]);
-}
-
-static void appendFormatedString(string* str, const char* fmt, ...) {
- char buffer[1024];
- va_list args;
- va_start(args, fmt);
- va_list argsCopy;
- va_copy(argsCopy, args);
- va_end(args);
- vsnprintf(buffer, 1024, fmt, argsCopy);
- va_end(argsCopy);
- string result = string(buffer);
- str->append(result);
-}
-
-static void
-appendFloatIfNotUndefined(string* base, const string key, const float num) {
- if (!YGFloatIsUndefined(num)) {
- appendFormatedString(base, "%s: %g; ", key.c_str(), num);
- }
-}
-
-static void appendNumberIfNotUndefined(
- string* base,
- const string key,
- const YGValue* const number) {
- if (number->unit != YGUnitUndefined) {
- if (number->unit == YGUnitAuto) {
- base->append(key + ": auto; ");
- } else {
- string unit = number->unit == YGUnitPoint ? "px" : "%%";
- appendFormatedString(
- base, "%s: %g%s; ", key.c_str(), number->value, unit.c_str());
- }
- }
-}
-
-static void appendNumberIfNotAuto(
- string* base,
- const string key,
- const YGValue* const number) {
- if (number->unit != YGUnitAuto) {
- appendNumberIfNotUndefined(base, key, number);
- }
-}
-
-static void appendNumberIfNotZero(
- string* base,
- const string str,
- const YGValue* const number) {
- if (!YGFloatsEqual(number->value, 0)) {
- appendNumberIfNotUndefined(base, str, number);
- }
-}
-
-static void appendEdges(string* base, const string key, const YGValue* edges) {
- if (areFourValuesEqual(edges)) {
- appendNumberIfNotZero(base, key, &edges[YGEdgeLeft]);
- } else {
- for (int edge = YGEdgeLeft; edge != YGEdgeAll; ++edge) {
- string str = key + "-" + YGEdgeToString(static_cast<YGEdge>(edge));
- appendNumberIfNotZero(base, str, &edges[edge]);
- }
- }
-}
-
-static void appendEdgeIfNotUndefined(
- string* base,
- const string str,
- const YGValue* edges,
- const YGEdge edge) {
- appendNumberIfNotUndefined(
- base, str, YGComputedEdgeValue(edges, edge, &YGValueUndefined));
-}
-
-void YGNodeToString(
- std::string* str,
- YGNodeRef node,
- YGPrintOptions options,
- uint32_t level) {
- indent(str, level);
- appendFormatedString(str, "<div ");
- if (node->print != nullptr) {
- node->print(node);
- }
-
- if (options & YGPrintOptionsLayout) {
- appendFormatedString(str, "layout=\"");
- appendFormatedString(
- str, "width: %g; ", node->layout.dimensions[YGDimensionWidth]);
- appendFormatedString(
- str, "height: %g; ", node->layout.dimensions[YGDimensionHeight]);
- appendFormatedString(str, "top: %g; ", node->layout.position[YGEdgeTop]);
- appendFormatedString(str, "left: %g;", node->layout.position[YGEdgeLeft]);
- appendFormatedString(str, "\" ");
- }
-
- if (options & YGPrintOptionsStyle) {
- appendFormatedString(str, "style=\"");
- if (node->style.flexDirection != gYGNodeDefaults.style.flexDirection) {
- appendFormatedString(
- str,
- "flex-direction: %s; ",
- YGFlexDirectionToString(node->style.flexDirection));
- }
- if (node->style.justifyContent != gYGNodeDefaults.style.justifyContent) {
- appendFormatedString(
- str,
- "justify-content: %s; ",
- YGJustifyToString(node->style.justifyContent));
- }
- if (node->style.alignItems != gYGNodeDefaults.style.alignItems) {
- appendFormatedString(
- str, "align-items: %s; ", YGAlignToString(node->style.alignItems));
- }
- if (node->style.alignContent != gYGNodeDefaults.style.alignContent) {
- appendFormatedString(
- str,
- "align-content: %s; ",
- YGAlignToString(node->style.alignContent));
- }
- if (node->style.alignSelf != gYGNodeDefaults.style.alignSelf) {
- appendFormatedString(
- str, "align-self: %s; ", YGAlignToString(node->style.alignSelf));
- }
- appendFloatIfNotUndefined(str, "flex-grow", node->style.flexGrow);
- appendFloatIfNotUndefined(str, "flex-shrink", node->style.flexShrink);
- appendNumberIfNotAuto(str, "flex-basis", &node->style.flexBasis);
- appendFloatIfNotUndefined(str, "flex", node->style.flex);
-
- if (node->style.flexWrap != gYGNodeDefaults.style.flexWrap) {
- appendFormatedString(
- str, "flexWrap: %s; ", YGWrapToString(node->style.flexWrap));
- }
-
- if (node->style.overflow != gYGNodeDefaults.style.overflow) {
- appendFormatedString(
- str, "overflow: %s; ", YGOverflowToString(node->style.overflow));
- }
-
- if (node->style.display != gYGNodeDefaults.style.display) {
- appendFormatedString(
- str, "display: %s; ", YGDisplayToString(node->style.display));
- }
- appendEdges(str, "margin", node->style.margin);
- appendEdges(str, "padding", node->style.padding);
- appendEdges(str, "border", node->style.border);
-
- appendNumberIfNotAuto(
- str, "width", &node->style.dimensions[YGDimensionWidth]);
- appendNumberIfNotAuto(
- str, "height", &node->style.dimensions[YGDimensionHeight]);
- appendNumberIfNotAuto(
- str, "max-width", &node->style.maxDimensions[YGDimensionWidth]);
- appendNumberIfNotAuto(
- str, "max-height", &node->style.maxDimensions[YGDimensionHeight]);
- appendNumberIfNotAuto(
- str, "min-width", &node->style.minDimensions[YGDimensionWidth]);
- appendNumberIfNotAuto(
- str, "min-height", &node->style.minDimensions[YGDimensionHeight]);
-
- if (node->style.positionType != gYGNodeDefaults.style.positionType) {
- appendFormatedString(
- str,
- "position: %s; ",
- YGPositionTypeToString(node->style.positionType));
- }
-
- appendEdgeIfNotUndefined(str, "left", node->style.position, YGEdgeLeft);
- appendEdgeIfNotUndefined(str, "right", node->style.position, YGEdgeRight);
- appendEdgeIfNotUndefined(str, "top", node->style.position, YGEdgeTop);
- appendEdgeIfNotUndefined(str, "bottom", node->style.position, YGEdgeBottom);
- appendFormatedString(str, "\" ");
-
- if (node->measure != nullptr) {
- appendFormatedString(str, "has-custom-measure=\"true\"");
- }
- }
- appendFormatedString(str, ">");
-
- const uint32_t childCount = node->children.size();
- if (options & YGPrintOptionsChildren && childCount > 0) {
- for (uint32_t i = 0; i < childCount; i++) {
- appendFormatedString(str, "\n");
- YGNodeToString(str, YGNodeGetChild(node, i), options, level + 1);
- }
- appendFormatedString(str, "\n");
- indent(str, level);
- }
- appendFormatedString(str, "</div>");
-}
-} // namespace yoga
-} // namespace facebook
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "YGNodePrint.h"
+#include <stdarg.h>
+#include "YGEnums.h"
+#include "YGNode.h"
+#include "Yoga-internal.h"
+
+namespace facebook {
+namespace yoga {
+typedef std::string string;
+
+static void indent(string* base, uint32_t level) {
+ for (uint32_t i = 0; i < level; ++i) {
+ base->append(" ");
+ }
+}
+
+static bool areFourValuesEqual(const std::array<YGValue, YGEdgeCount>& four) {
+ return YGValueEqual(four[0], four[1]) && YGValueEqual(four[0], four[2]) &&
+ YGValueEqual(four[0], four[3]);
+}
+
+static void appendFormatedString(string* str, const char* fmt, ...) {
+ va_list args;
+ va_start(args, fmt);
+ va_list argsCopy;
+ va_copy(argsCopy, args);
+ std::vector<char> buf(1 + vsnprintf(NULL, 0, fmt, args));
+ va_end(args);
+ vsnprintf(buf.data(), buf.size(), fmt, argsCopy);
+ va_end(argsCopy);
+ string result = string(buf.begin(), buf.end() - 1);
+ str->append(result);
+}
+
+static void appendFloatOptionalIfDefined(
+ string* base,
+ const string key,
+ const YGFloatOptional num) {
+ if (!num.isUndefined()) {
+ appendFormatedString(base, "%s: %g; ", key.c_str(), num.getValue());
+ }
+}
+
+static void appendNumberIfNotUndefined(
+ string* base,
+ const string key,
+ const YGValue number) {
+ if (number.unit != YGUnitUndefined) {
+ if (number.unit == YGUnitAuto) {
+ base->append(key + ": auto; ");
+ } else {
+ string unit = number.unit == YGUnitPoint ? "px" : "%%";
+ appendFormatedString(
+ base, "%s: %g%s; ", key.c_str(), number.value, unit.c_str());
+ }
+ }
+}
+
+static void
+appendNumberIfNotAuto(string* base, const string& key, const YGValue number) {
+ if (number.unit != YGUnitAuto) {
+ appendNumberIfNotUndefined(base, key, number);
+ }
+}
+
+static void
+appendNumberIfNotZero(string* base, const string& str, const YGValue number) {
+
+ if (number.unit == YGUnitAuto) {
+ base->append(str + ": auto; ");
+ } else if (!YGFloatsEqual(number.value, 0)) {
+ appendNumberIfNotUndefined(base, str, number);
+ }
+}
+
+static void appendEdges(
+ string* base,
+ const string& key,
+ const std::array<YGValue, YGEdgeCount>& edges) {
+ if (areFourValuesEqual(edges)) {
+ appendNumberIfNotZero(base, key, edges[YGEdgeLeft]);
+ } else {
+ for (int edge = YGEdgeLeft; edge != YGEdgeAll; ++edge) {
+ string str = key + "-" + YGEdgeToString(static_cast<YGEdge>(edge));
+ appendNumberIfNotZero(base, str, edges[edge]);
+ }
+ }
+}
+
+static void appendEdgeIfNotUndefined(
+ string* base,
+ const string& str,
+ const std::array<YGValue, YGEdgeCount>& edges,
+ const YGEdge edge) {
+ appendNumberIfNotUndefined(
+ base, str, *YGComputedEdgeValue(edges, edge, &YGValueUndefined));
+}
+
+void YGNodeToString(
+ std::string* str,
+ YGNodeRef node,
+ YGPrintOptions options,
+ uint32_t level) {
+ indent(str, level);
+ appendFormatedString(str, "<div ");
+ if (node->getPrintFunc() != nullptr) {
+ node->getPrintFunc()(node);
+ }
+
+ if (options & YGPrintOptionsLayout) {
+ appendFormatedString(str, "layout=\"");
+ appendFormatedString(
+ str, "width: %g; ", node->getLayout().dimensions[YGDimensionWidth]);
+ appendFormatedString(
+ str, "height: %g; ", node->getLayout().dimensions[YGDimensionHeight]);
+ appendFormatedString(
+ str, "top: %g; ", node->getLayout().position[YGEdgeTop]);
+ appendFormatedString(
+ str, "left: %g;", node->getLayout().position[YGEdgeLeft]);
+ appendFormatedString(str, "\" ");
+ }
+
+ if (options & YGPrintOptionsStyle) {
+ appendFormatedString(str, "style=\"");
+ if (node->getStyle().flexDirection != YGNode().getStyle().flexDirection) {
+ appendFormatedString(
+ str,
+ "flex-direction: %s; ",
+ YGFlexDirectionToString(node->getStyle().flexDirection));
+ }
+ if (node->getStyle().justifyContent != YGNode().getStyle().justifyContent) {
+ appendFormatedString(
+ str,
+ "justify-content: %s; ",
+ YGJustifyToString(node->getStyle().justifyContent));
+ }
+ if (node->getStyle().alignItems != YGNode().getStyle().alignItems) {
+ appendFormatedString(
+ str,
+ "align-items: %s; ",
+ YGAlignToString(node->getStyle().alignItems));
+ }
+ if (node->getStyle().alignContent != YGNode().getStyle().alignContent) {
+ appendFormatedString(
+ str,
+ "align-content: %s; ",
+ YGAlignToString(node->getStyle().alignContent));
+ }
+ if (node->getStyle().alignSelf != YGNode().getStyle().alignSelf) {
+ appendFormatedString(
+ str, "align-self: %s; ", YGAlignToString(node->getStyle().alignSelf));
+ }
+ appendFloatOptionalIfDefined(str, "flex-grow", node->getStyle().flexGrow);
+ appendFloatOptionalIfDefined(
+ str, "flex-shrink", node->getStyle().flexShrink);
+ appendNumberIfNotAuto(str, "flex-basis", node->getStyle().flexBasis);
+ appendFloatOptionalIfDefined(str, "flex", node->getStyle().flex);
+
+ if (node->getStyle().flexWrap != YGNode().getStyle().flexWrap) {
+ appendFormatedString(
+ str, "flexWrap: %s; ", YGWrapToString(node->getStyle().flexWrap));
+ }
+
+ if (node->getStyle().overflow != YGNode().getStyle().overflow) {
+ appendFormatedString(
+ str, "overflow: %s; ", YGOverflowToString(node->getStyle().overflow));
+ }
+
+ if (node->getStyle().display != YGNode().getStyle().display) {
+ appendFormatedString(
+ str, "display: %s; ", YGDisplayToString(node->getStyle().display));
+ }
+ appendEdges(str, "margin", node->getStyle().margin);
+ appendEdges(str, "padding", node->getStyle().padding);
+ appendEdges(str, "border", node->getStyle().border);
+
+ appendNumberIfNotAuto(
+ str, "width", node->getStyle().dimensions[YGDimensionWidth]);
+ appendNumberIfNotAuto(
+ str, "height", node->getStyle().dimensions[YGDimensionHeight]);
+ appendNumberIfNotAuto(
+ str, "max-width", node->getStyle().maxDimensions[YGDimensionWidth]);
+ appendNumberIfNotAuto(
+ str, "max-height", node->getStyle().maxDimensions[YGDimensionHeight]);
+ appendNumberIfNotAuto(
+ str, "min-width", node->getStyle().minDimensions[YGDimensionWidth]);
+ appendNumberIfNotAuto(
+ str, "min-height", node->getStyle().minDimensions[YGDimensionHeight]);
+
+ if (node->getStyle().positionType != YGNode().getStyle().positionType) {
+ appendFormatedString(
+ str,
+ "position: %s; ",
+ YGPositionTypeToString(node->getStyle().positionType));
+ }
+
+ appendEdgeIfNotUndefined(
+ str, "left", node->getStyle().position, YGEdgeLeft);
+ appendEdgeIfNotUndefined(
+ str, "right", node->getStyle().position, YGEdgeRight);
+ appendEdgeIfNotUndefined(str, "top", node->getStyle().position, YGEdgeTop);
+ appendEdgeIfNotUndefined(
+ str, "bottom", node->getStyle().position, YGEdgeBottom);
+ appendFormatedString(str, "\" ");
+
+ if (node->getMeasure() != nullptr) {
+ appendFormatedString(str, "has-custom-measure=\"true\"");
+ }
+ }
+ appendFormatedString(str, ">");
+
+ const uint32_t childCount = static_cast<uint32_t>(node->getChildren().size());
+ if (options & YGPrintOptionsChildren && childCount > 0) {
+ for (uint32_t i = 0; i < childCount; i++) {
+ appendFormatedString(str, "\n");
+ YGNodeToString(str, YGNodeGetChild(node, i), options, level + 1);
+ }
+ appendFormatedString(str, "\n");
+ indent(str, level);
+ }
+ appendFormatedString(str, "</div>");
+}
+} // namespace yoga
+} // namespace facebook
diff --git a/yoga/YGNodePrint.h b/yoga/YGNodePrint.h
index 6a9adb3..a4f24cb 100644..100755
--- a/yoga/YGNodePrint.h
+++ b/yoga/YGNodePrint.h
@@ -1,24 +1,22 @@
-/**
- * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-#pragma once
-#include <string>
-
-#include "Yoga.h"
-
-namespace facebook {
-namespace yoga {
-
-void YGNodeToString(
- std::string* str,
- YGNodeRef node,
- YGPrintOptions options,
- uint32_t level);
-
-} // namespace yoga
-} // namespace facebook
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+#pragma once
+#include <string>
+
+#include "Yoga.h"
+
+namespace facebook {
+namespace yoga {
+
+void YGNodeToString(
+ std::string* str,
+ YGNodeRef node,
+ YGPrintOptions options,
+ uint32_t level);
+
+} // namespace yoga
+} // namespace facebook
diff --git a/yoga/YGStyle.cpp b/yoga/YGStyle.cpp
new file mode 100755
index 0000000..44fd9e5
--- /dev/null
+++ b/yoga/YGStyle.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#include "YGStyle.h"
+
+const YGValue kYGValueUndefined = {0, YGUnitUndefined};
+
+const YGValue kYGValueAuto = {0, YGUnitAuto};
+
+const std::array<YGValue, YGEdgeCount> kYGDefaultEdgeValuesUnit = {
+ {kYGValueUndefined,
+ kYGValueUndefined,
+ kYGValueUndefined,
+ kYGValueUndefined,
+ kYGValueUndefined,
+ kYGValueUndefined,
+ kYGValueUndefined,
+ kYGValueUndefined,
+ kYGValueUndefined}};
+
+const std::array<YGValue, 2> kYGDefaultDimensionValuesAutoUnit = {
+ {kYGValueAuto, kYGValueAuto}};
+
+const std::array<YGValue, 2> kYGDefaultDimensionValuesUnit = {
+ {kYGValueUndefined, kYGValueUndefined}};
+
+YGStyle::YGStyle()
+ : direction(YGDirectionInherit),
+ flexDirection(YGFlexDirectionColumn),
+ justifyContent(YGJustifyFlexStart),
+ alignContent(YGAlignFlexStart),
+ alignItems(YGAlignStretch),
+ alignSelf(YGAlignAuto),
+ positionType(YGPositionTypeRelative),
+ flexWrap(YGWrapNoWrap),
+ overflow(YGOverflowVisible),
+ display(YGDisplayFlex),
+ flex(YGFloatOptional()),
+ flexGrow(YGFloatOptional()),
+ flexShrink(YGFloatOptional()),
+ flexBasis(kYGValueAuto),
+ margin(kYGDefaultEdgeValuesUnit),
+ position(kYGDefaultEdgeValuesUnit),
+ padding(kYGDefaultEdgeValuesUnit),
+ border(kYGDefaultEdgeValuesUnit),
+ dimensions(kYGDefaultDimensionValuesAutoUnit),
+ minDimensions(kYGDefaultDimensionValuesUnit),
+ maxDimensions(kYGDefaultDimensionValuesUnit),
+ aspectRatio(YGFloatOptional()) {}
+
+// Yoga specific properties, not compatible with flexbox specification
+bool YGStyle::operator==(const YGStyle& style) {
+ bool areNonFloatValuesEqual = direction == style.direction &&
+ flexDirection == style.flexDirection &&
+ justifyContent == style.justifyContent &&
+ alignContent == style.alignContent && alignItems == style.alignItems &&
+ alignSelf == style.alignSelf && positionType == style.positionType &&
+ flexWrap == style.flexWrap && overflow == style.overflow &&
+ display == style.display && YGValueEqual(flexBasis, style.flexBasis) &&
+ YGValueArrayEqual(margin, style.margin) &&
+ YGValueArrayEqual(position, style.position) &&
+ YGValueArrayEqual(padding, style.padding) &&
+ YGValueArrayEqual(border, style.border) &&
+ YGValueArrayEqual(dimensions, style.dimensions) &&
+ YGValueArrayEqual(minDimensions, style.minDimensions) &&
+ YGValueArrayEqual(maxDimensions, style.maxDimensions);
+
+ areNonFloatValuesEqual =
+ areNonFloatValuesEqual && flex.isUndefined() == style.flex.isUndefined();
+ if (areNonFloatValuesEqual && !flex.isUndefined() &&
+ !style.flex.isUndefined()) {
+ areNonFloatValuesEqual =
+ areNonFloatValuesEqual && flex.getValue() == style.flex.getValue();
+ }
+
+ areNonFloatValuesEqual = areNonFloatValuesEqual &&
+ flexGrow.isUndefined() == style.flexGrow.isUndefined();
+ if (areNonFloatValuesEqual && !flexGrow.isUndefined()) {
+ areNonFloatValuesEqual = areNonFloatValuesEqual &&
+ flexGrow.getValue() == style.flexGrow.getValue();
+ }
+
+ areNonFloatValuesEqual = areNonFloatValuesEqual &&
+ flexShrink.isUndefined() == style.flexShrink.isUndefined();
+ if (areNonFloatValuesEqual && !style.flexShrink.isUndefined()) {
+ areNonFloatValuesEqual = areNonFloatValuesEqual &&
+ flexShrink.getValue() == style.flexShrink.getValue();
+ }
+
+ if (!(aspectRatio.isUndefined() && style.aspectRatio.isUndefined())) {
+ areNonFloatValuesEqual = areNonFloatValuesEqual &&
+ aspectRatio.getValue() == style.aspectRatio.getValue();
+ }
+
+ return areNonFloatValuesEqual;
+}
diff --git a/yoga/Yoga-internal.h b/yoga/Yoga-internal.h
index 96c41a5..0e02646 100644..100755
--- a/yoga/Yoga-internal.h
+++ b/yoga/Yoga-internal.h
@@ -1,230 +1,120 @@
-/**
- * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-#pragma once
-#include <vector>
-
-#include "Yoga.h"
-
-typedef std::vector<YGNodeRef> YGVector;
-
-YG_EXTERN_C_BEGIN
-
-WIN_EXPORT float YGRoundValueToPixelGrid(const float value,
- const float pointScaleFactor,
- const bool forceCeil,
- const bool forceFloor);
-
-YG_EXTERN_C_END
-
-typedef struct YGCachedMeasurement {
- float availableWidth;
- float availableHeight;
- YGMeasureMode widthMeasureMode;
- YGMeasureMode heightMeasureMode;
-
- float computedWidth;
- float computedHeight;
-} YGCachedMeasurement;
-
-// This value was chosen based on empiracle data. Even the most complicated
-// layouts should not require more than 16 entries to fit within the cache.
-#define YG_MAX_CACHED_RESULT_COUNT 16
-
-typedef struct YGLayout {
- float position[4];
- float dimensions[2];
- float margin[6];
- float border[6];
- float padding[6];
- YGDirection direction;
-
- uint32_t computedFlexBasisGeneration;
- float computedFlexBasis;
- bool hadOverflow;
-
- // Instead of recomputing the entire layout every single time, we
- // cache some information to break early when nothing changed
- uint32_t generationCount;
- YGDirection lastParentDirection;
-
- uint32_t nextCachedMeasurementsIndex;
- YGCachedMeasurement cachedMeasurements[YG_MAX_CACHED_RESULT_COUNT];
- float measuredDimensions[2];
-
- YGCachedMeasurement cachedLayout;
-} YGLayout;
-
-typedef struct YGStyle {
- YGDirection direction;
- YGFlexDirection flexDirection;
- YGJustify justifyContent;
- YGAlign alignContent;
- YGAlign alignItems;
- YGAlign alignSelf;
- YGPositionType positionType;
- YGWrap flexWrap;
- YGOverflow overflow;
- YGDisplay display;
- float flex;
- float flexGrow;
- float flexShrink;
- YGValue flexBasis;
- YGValue margin[YGEdgeCount];
- YGValue position[YGEdgeCount];
- YGValue padding[YGEdgeCount];
- YGValue border[YGEdgeCount];
- YGValue dimensions[2];
- YGValue minDimensions[2];
- YGValue maxDimensions[2];
-
- // Yoga specific properties, not compatible with flexbox specification
- float aspectRatio;
-} YGStyle;
-
-typedef struct YGConfig {
- bool experimentalFeatures[YGExperimentalFeatureCount + 1];
- bool useWebDefaults;
- bool useLegacyStretchBehaviour;
- float pointScaleFactor;
- YGLogger logger;
- YGNodeClonedFunc cloneNodeCallback;
- void* context;
-} YGConfig;
-
-typedef struct YGNode {
- YGStyle style;
- YGLayout layout;
- uint32_t lineIndex;
-
- YGNodeRef parent;
- YGVector children;
-
- struct YGNode* nextChild;
-
- YGMeasureFunc measure;
- YGBaselineFunc baseline;
- YGPrintFunc print;
- YGConfigRef config;
- void* context;
-
- bool isDirty;
- bool hasNewLayout;
- YGNodeType nodeType;
-
- YGValue const* resolvedDimensions[2];
-} YGNode;
-
-#define YG_UNDEFINED_VALUES \
- { .value = YGUndefined, .unit = YGUnitUndefined }
-
-#define YG_AUTO_VALUES \
- { .value = YGUndefined, .unit = YGUnitAuto }
-
-#define YG_DEFAULT_EDGE_VALUES_UNIT \
- { \
- [YGEdgeLeft] = YG_UNDEFINED_VALUES, [YGEdgeTop] = YG_UNDEFINED_VALUES, \
- [YGEdgeRight] = YG_UNDEFINED_VALUES, [YGEdgeBottom] = YG_UNDEFINED_VALUES, \
- [YGEdgeStart] = YG_UNDEFINED_VALUES, [YGEdgeEnd] = YG_UNDEFINED_VALUES, \
- [YGEdgeHorizontal] = YG_UNDEFINED_VALUES, \
- [YGEdgeVertical] = YG_UNDEFINED_VALUES, [YGEdgeAll] = YG_UNDEFINED_VALUES, \
- }
-
-#define YG_DEFAULT_DIMENSION_VALUES \
- { [YGDimensionWidth] = YGUndefined, [YGDimensionHeight] = YGUndefined, }
-
-#define YG_DEFAULT_DIMENSION_VALUES_UNIT \
- { \
- [YGDimensionWidth] = YG_UNDEFINED_VALUES, \
- [YGDimensionHeight] = YG_UNDEFINED_VALUES, \
- }
-
-#define YG_DEFAULT_DIMENSION_VALUES_AUTO_UNIT \
- { [YGDimensionWidth] = YG_AUTO_VALUES, [YGDimensionHeight] = YG_AUTO_VALUES, }
-
-static const float kDefaultFlexGrow = 0.0f;
-static const float kDefaultFlexShrink = 0.0f;
-static const float kWebDefaultFlexShrink = 1.0f;
-
-static const YGStyle gYGNodeStyleDefaults = {
- .direction = YGDirectionInherit,
- .flexDirection = YGFlexDirectionColumn,
- .justifyContent = YGJustifyFlexStart,
- .alignContent = YGAlignFlexStart,
- .alignItems = YGAlignStretch,
- .alignSelf = YGAlignAuto,
- .positionType = YGPositionTypeRelative,
- .flexWrap = YGWrapNoWrap,
- .overflow = YGOverflowVisible,
- .display = YGDisplayFlex,
- .flex = YGUndefined,
- .flexGrow = YGUndefined,
- .flexShrink = YGUndefined,
- .flexBasis = YG_AUTO_VALUES,
- .margin = YG_DEFAULT_EDGE_VALUES_UNIT,
- .position = YG_DEFAULT_EDGE_VALUES_UNIT,
- .padding = YG_DEFAULT_EDGE_VALUES_UNIT,
- .border = YG_DEFAULT_EDGE_VALUES_UNIT,
- .dimensions = YG_DEFAULT_DIMENSION_VALUES_AUTO_UNIT,
- .minDimensions = YG_DEFAULT_DIMENSION_VALUES_UNIT,
- .maxDimensions = YG_DEFAULT_DIMENSION_VALUES_UNIT,
- .aspectRatio = YGUndefined,
-};
-
-static const YGLayout gYGNodeLayoutDefaults = {
- .position = {},
- .dimensions = YG_DEFAULT_DIMENSION_VALUES,
- .margin = {},
- .border = {},
- .padding = {},
- .direction = YGDirectionInherit,
- .computedFlexBasisGeneration = 0,
- .computedFlexBasis = YGUndefined,
- .hadOverflow = false,
- .generationCount = 0,
- .lastParentDirection = (YGDirection)-1,
- .nextCachedMeasurementsIndex = 0,
- .cachedMeasurements = {},
- .measuredDimensions = YG_DEFAULT_DIMENSION_VALUES,
- .cachedLayout =
- {
- .availableWidth = 0,
- .availableHeight = 0,
- .widthMeasureMode = (YGMeasureMode)-1,
- .heightMeasureMode = (YGMeasureMode)-1,
- .computedWidth = -1,
- .computedHeight = -1,
- },
-};
-
-static const YGNode gYGNodeDefaults = {
- .style = gYGNodeStyleDefaults,
- .layout = gYGNodeLayoutDefaults,
- .lineIndex = 0,
- .parent = nullptr,
- .children = YGVector(),
- .nextChild = nullptr,
- .measure = nullptr,
- .baseline = nullptr,
- .print = nullptr,
- .config = nullptr,
- .context = nullptr,
- .isDirty = false,
- .hasNewLayout = true,
- .nodeType = YGNodeTypeDefault,
- .resolvedDimensions = {[YGDimensionWidth] = &YGValueUndefined,
- [YGDimensionHeight] = &YGValueUndefined},
-};
-
-extern bool YGFloatsEqual(const float a, const float b);
-extern bool YGValueEqual(const YGValue a, const YGValue b);
-extern const YGValue* YGComputedEdgeValue(
- const YGValue edges[YGEdgeCount],
- const YGEdge edge,
- const YGValue* const defaultValue);
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#pragma once
+#include <algorithm>
+#include <array>
+#include <cmath>
+#include <vector>
+#include "Yoga.h"
+
+using YGVector = std::vector<YGNodeRef>;
+
+YG_EXTERN_C_BEGIN
+
+WIN_EXPORT float YGRoundValueToPixelGrid(
+ const float value,
+ const float pointScaleFactor,
+ const bool forceCeil,
+ const bool forceFloor);
+
+YG_EXTERN_C_END
+
+namespace facebook {
+namespace yoga {
+
+inline bool isUndefined(float value) {
+ // Value of a float in the case of it being not defined is 10.1E20. Earlier
+ // it used to be NAN, the benefit of which was that if NAN is involved in any
+ // mathematical expression the result was NAN. But since we want to have
+ // `-ffast-math` flag being used by compiler which assumes that the floating
+ // point values are not NAN and Inf, we represent YGUndefined as 10.1E20. But
+ // now if YGUndefined is involved in any mathematical operations this
+ // value(10.1E20) would change. So the following check makes sure that if the
+ // value is outside a range (-10E8, 10E8) then it is undefined.
+ return value >= 10E8 || value <= -10E8;
+}
+
+} // namespace yoga
+} // namespace facebook
+
+using namespace facebook;
+
+extern const std::array<YGEdge, 4> trailing;
+extern const std::array<YGEdge, 4> leading;
+extern bool YGValueEqual(const YGValue a, const YGValue b);
+extern const YGValue YGValueUndefined;
+extern const YGValue YGValueAuto;
+extern const YGValue YGValueZero;
+
+template <std::size_t size>
+bool YGValueArrayEqual(
+ const std::array<YGValue, size> val1,
+ const std::array<YGValue, size> val2) {
+ bool areEqual = true;
+ for (uint32_t i = 0; i < size && areEqual; ++i) {
+ areEqual = YGValueEqual(val1[i], val2[i]);
+ }
+ return areEqual;
+}
+
+struct YGCachedMeasurement {
+ float availableWidth;
+ float availableHeight;
+ YGMeasureMode widthMeasureMode;
+ YGMeasureMode heightMeasureMode;
+
+ float computedWidth;
+ float computedHeight;
+
+ YGCachedMeasurement()
+ : availableWidth(0),
+ availableHeight(0),
+ widthMeasureMode((YGMeasureMode)-1),
+ heightMeasureMode((YGMeasureMode)-1),
+ computedWidth(-1),
+ computedHeight(-1) {}
+
+ bool operator==(YGCachedMeasurement measurement) const {
+ bool isEqual = widthMeasureMode == measurement.widthMeasureMode &&
+ heightMeasureMode == measurement.heightMeasureMode;
+
+ if (!yoga::isUndefined(availableWidth) ||
+ !yoga::isUndefined(measurement.availableWidth)) {
+ isEqual = isEqual && availableWidth == measurement.availableWidth;
+ }
+ if (!yoga::isUndefined(availableHeight) ||
+ !yoga::isUndefined(measurement.availableHeight)) {
+ isEqual = isEqual && availableHeight == measurement.availableHeight;
+ }
+ if (!yoga::isUndefined(computedWidth) ||
+ !yoga::isUndefined(measurement.computedWidth)) {
+ isEqual = isEqual && computedWidth == measurement.computedWidth;
+ }
+ if (!yoga::isUndefined(computedHeight) ||
+ !yoga::isUndefined(measurement.computedHeight)) {
+ isEqual = isEqual && computedHeight == measurement.computedHeight;
+ }
+
+ return isEqual;
+ }
+};
+
+// This value was chosen based on empiracle data. Even the most complicated
+// layouts should not require more than 16 entries to fit within the cache.
+#define YG_MAX_CACHED_RESULT_COUNT 16
+
+static const float kDefaultFlexGrow = 0.0f;
+static const float kDefaultFlexShrink = 0.0f;
+static const float kWebDefaultFlexShrink = 1.0f;
+
+extern bool YGFloatsEqual(const float a, const float b);
+extern bool YGValueEqual(const YGValue a, const YGValue b);
+extern const YGValue* YGComputedEdgeValue(
+ const std::array<YGValue, YGEdgeCount>& edges,
+ const YGEdge edge,
+ const YGValue* const defaultValue);
diff --git a/yoga/Yoga.cpp b/yoga/Yoga.cpp
index 897b640..6d146c3 100644..100755
--- a/yoga/Yoga.cpp
+++ b/yoga/Yoga.cpp
@@ -1,3533 +1,4316 @@
-/**
- * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-#include "Yoga.h"
-#include <string.h>
-#include <algorithm>
-#include "YGNodePrint.h"
-#include "Yoga-internal.h"
-
-#ifdef _MSC_VER
-#include <float.h>
-#ifndef isnan
-#define isnan _isnan
-#endif
-#ifndef __cplusplus
-#define inline __inline
-#endif
-
-/* define fmaxf if < VC12 */
-#if _MSC_VER < 1800
-__forceinline const float fmaxf(const float a, const float b) {
- return (a > b) ? a : b;
-}
-#endif
-#endif
-
-#ifdef ANDROID
-static int YGAndroidLog(const YGConfigRef config,
- const YGNodeRef node,
- YGLogLevel level,
- const char *format,
- va_list args);
-#else
-static int YGDefaultLog(const YGConfigRef config,
- const YGNodeRef node,
- YGLogLevel level,
- const char *format,
- va_list args);
-#endif
-
-static YGConfig gYGConfigDefaults = {
- .experimentalFeatures =
- {
- [YGExperimentalFeatureWebFlexBasis] = false,
- },
- .useWebDefaults = false,
- .useLegacyStretchBehaviour = false,
- .pointScaleFactor = 1.0f,
-#ifdef ANDROID
- .logger = &YGAndroidLog,
-#else
- .logger = &YGDefaultLog,
-#endif
- .cloneNodeCallback = nullptr,
- .context = nullptr,
-};
-
-static void YGNodeMarkDirtyInternal(const YGNodeRef node);
-
-static YGValue YGValueZero = {.value = 0, .unit = YGUnitPoint};
-
-static bool YGNodeListDelete(YGVector& list, const YGNodeRef node) {
- std::vector<YGNodeRef>::iterator p =
- std::find(list.begin(), list.end(), node);
- if (p != list.end()) {
- list.erase(p);
- return true;
- }
- return false;
-}
-
-#ifdef ANDROID
-#include <android/log.h>
-static int YGAndroidLog(const YGConfigRef config,
- const YGNodeRef node,
- YGLogLevel level,
- const char *format,
- va_list args) {
- int androidLevel = YGLogLevelDebug;
- switch (level) {
- case YGLogLevelFatal:
- androidLevel = ANDROID_LOG_FATAL;
- break;
- case YGLogLevelError:
- androidLevel = ANDROID_LOG_ERROR;
- break;
- case YGLogLevelWarn:
- androidLevel = ANDROID_LOG_WARN;
- break;
- case YGLogLevelInfo:
- androidLevel = ANDROID_LOG_INFO;
- break;
- case YGLogLevelDebug:
- androidLevel = ANDROID_LOG_DEBUG;
- break;
- case YGLogLevelVerbose:
- androidLevel = ANDROID_LOG_VERBOSE;
- break;
- }
- const int result = __android_log_vprint(androidLevel, "yoga", format, args);
- return result;
-}
-#else
-#define YG_UNUSED(x) (void)(x);
-
-static int YGDefaultLog(const YGConfigRef config,
- const YGNodeRef node,
- YGLogLevel level,
- const char *format,
- va_list args) {
- YG_UNUSED(config);
- YG_UNUSED(node);
- switch (level) {
- case YGLogLevelError:
- case YGLogLevelFatal:
- return vfprintf(stderr, format, args);
- case YGLogLevelWarn:
- case YGLogLevelInfo:
- case YGLogLevelDebug:
- case YGLogLevelVerbose:
- default:
- return vprintf(format, args);
- }
-}
-
-#undef YG_UNUSED
-#endif
-
-bool YGFloatIsUndefined(const float value) {
- return isnan(value);
-}
-
-const YGValue* YGComputedEdgeValue(
- const YGValue edges[YGEdgeCount],
- const YGEdge edge,
- const YGValue* const defaultValue) {
- if (edges[edge].unit != YGUnitUndefined) {
- return &edges[edge];
- }
-
- if ((edge == YGEdgeTop || edge == YGEdgeBottom) &&
- edges[YGEdgeVertical].unit != YGUnitUndefined) {
- return &edges[YGEdgeVertical];
- }
-
- if ((edge == YGEdgeLeft || edge == YGEdgeRight || edge == YGEdgeStart || edge == YGEdgeEnd) &&
- edges[YGEdgeHorizontal].unit != YGUnitUndefined) {
- return &edges[YGEdgeHorizontal];
- }
-
- if (edges[YGEdgeAll].unit != YGUnitUndefined) {
- return &edges[YGEdgeAll];
- }
-
- if (edge == YGEdgeStart || edge == YGEdgeEnd) {
- return &YGValueUndefined;
- }
-
- return defaultValue;
-}
-
-static inline float YGResolveValue(const YGValue *const value, const float parentSize) {
- switch (value->unit) {
- case YGUnitUndefined:
- case YGUnitAuto:
- return YGUndefined;
- case YGUnitPoint:
- return value->value;
- case YGUnitPercent:
- return value->value * parentSize / 100.0f;
- }
- return YGUndefined;
-}
-
-static inline float YGResolveValueMargin(const YGValue *const value, const float parentSize) {
- return value->unit == YGUnitAuto ? 0 : YGResolveValue(value, parentSize);
-}
-
-int32_t gNodeInstanceCount = 0;
-int32_t gConfigInstanceCount = 0;
-
-WIN_EXPORT YGNodeRef YGNodeNewWithConfig(const YGConfigRef config) {
- const YGNodeRef node = (const YGNodeRef)malloc(sizeof(YGNode));
- YGAssertWithConfig(
- config, node != nullptr, "Could not allocate memory for node");
- gNodeInstanceCount++;
-
- memcpy(node, &gYGNodeDefaults, sizeof(YGNode));
- if (config->useWebDefaults) {
- node->style.flexDirection = YGFlexDirectionRow;
- node->style.alignContent = YGAlignStretch;
- }
- node->config = config;
- return node;
-}
-
-YGNodeRef YGNodeNew(void) {
- return YGNodeNewWithConfig(&gYGConfigDefaults);
-}
-
-YGNodeRef YGNodeClone(YGNodeRef oldNode) {
- YGNodeRef node = new YGNode(*oldNode);
- YGAssertWithConfig(
- oldNode->config, node != nullptr, "Could not allocate memory for node");
- gNodeInstanceCount++;
- node->parent = nullptr;
- return node;
-}
-
-void YGNodeFree(const YGNodeRef node) {
- if (node->parent) {
- YGNodeListDelete(node->parent->children, node);
- node->parent = nullptr;
- }
-
- const uint32_t childCount = YGNodeGetChildCount(node);
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef child = YGNodeGetChild(node, i);
- child->parent = nullptr;
- }
-
- YGVector().swap(node->children);
- free(node);
- gNodeInstanceCount--;
-}
-
-void YGNodeFreeRecursive(const YGNodeRef root) {
- while (YGNodeGetChildCount(root) > 0) {
- const YGNodeRef child = YGNodeGetChild(root, 0);
- if (child->parent != root) {
- // Don't free shared nodes that we don't own.
- break;
- }
- YGNodeRemoveChild(root, child);
- YGNodeFreeRecursive(child);
- }
- YGNodeFree(root);
-}
-
-void YGNodeReset(const YGNodeRef node) {
- YGAssertWithNode(node,
- YGNodeGetChildCount(node) == 0,
- "Cannot reset a node which still has children attached");
- YGAssertWithNode(
- node,
- node->parent == nullptr,
- "Cannot reset a node still attached to a parent");
-
- YGVector().swap(node->children);
-
- const YGConfigRef config = node->config;
- memcpy(node, &gYGNodeDefaults, sizeof(YGNode));
- if (config->useWebDefaults) {
- node->style.flexDirection = YGFlexDirectionRow;
- node->style.alignContent = YGAlignStretch;
- }
- node->config = config;
-}
-
-int32_t YGNodeGetInstanceCount(void) {
- return gNodeInstanceCount;
-}
-
-int32_t YGConfigGetInstanceCount(void) {
- return gConfigInstanceCount;
-}
-
-// Export only for C#
-YGConfigRef YGConfigGetDefault() {
- return &gYGConfigDefaults;
-}
-
-YGConfigRef YGConfigNew(void) {
- const YGConfigRef config = (const YGConfigRef)malloc(sizeof(YGConfig));
- YGAssert(config != nullptr, "Could not allocate memory for config");
-
- gConfigInstanceCount++;
- memcpy(config, &gYGConfigDefaults, sizeof(YGConfig));
- return config;
-}
-
-void YGConfigFree(const YGConfigRef config) {
- free(config);
- gConfigInstanceCount--;
-}
-
-void YGConfigCopy(const YGConfigRef dest, const YGConfigRef src) {
- memcpy(dest, src, sizeof(YGConfig));
-}
-
-static void YGNodeMarkDirtyInternal(const YGNodeRef node) {
- if (!node->isDirty) {
- node->isDirty = true;
- node->layout.computedFlexBasis = YGUndefined;
- if (node->parent) {
- YGNodeMarkDirtyInternal(node->parent);
- }
- }
-}
-
-void YGNodeSetMeasureFunc(const YGNodeRef node, YGMeasureFunc measureFunc) {
- if (measureFunc == nullptr) {
- node->measure = nullptr;
- // TODO: t18095186 Move nodeType to opt-in function and mark appropriate places in Litho
- node->nodeType = YGNodeTypeDefault;
- } else {
- YGAssertWithNode(
- node,
- YGNodeGetChildCount(node) == 0,
- "Cannot set measure function: Nodes with measure functions cannot have children.");
- node->measure = measureFunc;
- // TODO: t18095186 Move nodeType to opt-in function and mark appropriate places in Litho
- node->nodeType = YGNodeTypeText;
- }
-}
-
-YGMeasureFunc YGNodeGetMeasureFunc(const YGNodeRef node) {
- return node->measure;
-}
-
-void YGNodeSetBaselineFunc(const YGNodeRef node, YGBaselineFunc baselineFunc) {
- node->baseline = baselineFunc;
-}
-
-YGBaselineFunc YGNodeGetBaselineFunc(const YGNodeRef node) {
- return node->baseline;
-}
-
-static void YGCloneChildrenIfNeeded(const YGNodeRef parent) {
- // YGNodeRemoveChild has a forked variant of this algorithm optimized for deletions.
- const uint32_t childCount = YGNodeGetChildCount(parent);
- if (childCount == 0) {
- // This is an empty set. Nothing to clone.
- return;
- }
-
- const YGNodeRef firstChild = YGNodeGetChild(parent, 0);
- if (firstChild->parent == parent) {
- // If the first child has this node as its parent, we assume that it is already unique.
- // We can do this because if we have it has a child, that means that its parent was at some
- // point cloned which made that subtree immutable.
- // We also assume that all its sibling are cloned as well.
- return;
- }
-
- const YGNodeClonedFunc cloneNodeCallback = parent->config->cloneNodeCallback;
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef oldChild = parent->children[i];
- const YGNodeRef newChild = YGNodeClone(oldChild);
- parent->children[i] = newChild;
- newChild->parent = parent;
- if (cloneNodeCallback) {
- cloneNodeCallback(oldChild, newChild, parent, i);
- }
- }
-}
-
-void YGNodeInsertChild(const YGNodeRef node, const YGNodeRef child, const uint32_t index) {
- YGAssertWithNode(
- node,
- child->parent == nullptr,
- "Child already has a parent, it must be removed first.");
- YGAssertWithNode(
- node,
- node->measure == nullptr,
- "Cannot add child: Nodes with measure functions cannot have children.");
-
- YGCloneChildrenIfNeeded(node);
- node->children.insert(node->children.begin() + index, child);
- child->parent = node;
- YGNodeMarkDirtyInternal(node);
-}
-
-void YGNodeRemoveChild(const YGNodeRef parent, const YGNodeRef excludedChild) {
- // This algorithm is a forked variant from YGCloneChildrenIfNeeded that excludes a child.
- const uint32_t childCount = YGNodeGetChildCount(parent);
-
- if (childCount == 0) {
- // This is an empty set. Nothing to remove.
- return;
- }
- const YGNodeRef firstChild = YGNodeGetChild(parent, 0);
- if (firstChild->parent == parent) {
- // If the first child has this node as its parent, we assume that it is already unique.
- // We can now try to delete a child in this list.
- if (YGNodeListDelete(parent->children, excludedChild)) {
- excludedChild->layout = gYGNodeDefaults.layout; // layout is no longer valid
- excludedChild->parent = nullptr;
- YGNodeMarkDirtyInternal(parent);
- }
- return;
- }
- // Otherwise we have to clone the node list except for the child we're trying to delete.
- // We don't want to simply clone all children, because then the host will need to free
- // the clone of the child that was just deleted.
- const YGNodeClonedFunc cloneNodeCallback = parent->config->cloneNodeCallback;
- uint32_t nextInsertIndex = 0;
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef oldChild = parent->children[i];
- if (excludedChild == oldChild) {
- // Ignore the deleted child. Don't reset its layout or parent since it is still valid
- // in the other parent. However, since this parent has now changed, we need to mark it
- // as dirty.
- YGNodeMarkDirtyInternal(parent);
- continue;
- }
- const YGNodeRef newChild = YGNodeClone(oldChild);
- parent->children[nextInsertIndex] = newChild;
- newChild->parent = parent;
- if (cloneNodeCallback) {
- cloneNodeCallback(oldChild, newChild, parent, nextInsertIndex);
- }
- nextInsertIndex++;
- }
- while (nextInsertIndex < childCount) {
- parent->children.erase(parent->children.begin() + nextInsertIndex);
- nextInsertIndex++;
- }
-}
-
-void YGNodeRemoveAllChildren(const YGNodeRef parent) {
- const uint32_t childCount = YGNodeGetChildCount(parent);
- if (childCount == 0) {
- // This is an empty set already. Nothing to do.
- return;
- }
- const YGNodeRef firstChild = YGNodeGetChild(parent, 0);
- if (firstChild->parent == parent) {
- // If the first child has this node as its parent, we assume that this child set is unique.
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef oldChild = YGNodeGetChild(parent, i);
- oldChild->layout = gYGNodeDefaults.layout; // layout is no longer valid
- oldChild->parent = nullptr;
- }
- YGVector().swap(parent->children);
- YGNodeMarkDirtyInternal(parent);
- return;
- }
- // Otherwise, we are not the owner of the child set. We don't have to do anything to clear it.
- parent->children = YGVector();
- YGNodeMarkDirtyInternal(parent);
-}
-
-YGNodeRef YGNodeGetChild(const YGNodeRef node, const uint32_t index) {
- if (index < node->children.size()) {
- return node->children[index];
- }
- return nullptr;
-}
-
-YGNodeRef YGNodeGetParent(const YGNodeRef node) {
- return node->parent;
-}
-
-uint32_t YGNodeGetChildCount(const YGNodeRef node) {
- return node->children.size();
-}
-
-void YGNodeMarkDirty(const YGNodeRef node) {
- YGAssertWithNode(
- node,
- node->measure != nullptr,
- "Only leaf nodes with custom measure functions"
- "should manually mark themselves as dirty");
-
- YGNodeMarkDirtyInternal(node);
-}
-
-bool YGNodeIsDirty(const YGNodeRef node) {
- return node->isDirty;
-}
-
-void YGNodeCopyStyle(const YGNodeRef dstNode, const YGNodeRef srcNode) {
- if (memcmp(&dstNode->style, &srcNode->style, sizeof(YGStyle)) != 0) {
- memcpy(&dstNode->style, &srcNode->style, sizeof(YGStyle));
- YGNodeMarkDirtyInternal(dstNode);
- }
-}
-
-static inline float YGResolveFlexGrow(const YGNodeRef node) {
- // Root nodes flexGrow should always be 0
- if (node->parent == nullptr) {
- return 0.0;
- }
- if (!YGFloatIsUndefined(node->style.flexGrow)) {
- return node->style.flexGrow;
- }
- if (!YGFloatIsUndefined(node->style.flex) && node->style.flex > 0.0f) {
- return node->style.flex;
- }
- return kDefaultFlexGrow;
-}
-
-float YGNodeStyleGetFlexGrow(const YGNodeRef node) {
- return YGFloatIsUndefined(node->style.flexGrow) ? kDefaultFlexGrow : node->style.flexGrow;
-}
-
-float YGNodeStyleGetFlexShrink(const YGNodeRef node) {
- return YGFloatIsUndefined(node->style.flexShrink)
- ? (node->config->useWebDefaults ? kWebDefaultFlexShrink : kDefaultFlexShrink)
- : node->style.flexShrink;
-}
-
-static inline float YGNodeResolveFlexShrink(const YGNodeRef node) {
- // Root nodes flexShrink should always be 0
- if (node->parent == nullptr) {
- return 0.0;
- }
- if (!YGFloatIsUndefined(node->style.flexShrink)) {
- return node->style.flexShrink;
- }
- if (!node->config->useWebDefaults && !YGFloatIsUndefined(node->style.flex) &&
- node->style.flex < 0.0f) {
- return -node->style.flex;
- }
- return node->config->useWebDefaults ? kWebDefaultFlexShrink : kDefaultFlexShrink;
-}
-
-static inline const YGValue *YGNodeResolveFlexBasisPtr(const YGNodeRef node) {
- if (node->style.flexBasis.unit != YGUnitAuto && node->style.flexBasis.unit != YGUnitUndefined) {
- return &node->style.flexBasis;
- }
- if (!YGFloatIsUndefined(node->style.flex) && node->style.flex > 0.0f) {
- return node->config->useWebDefaults ? &YGValueAuto : &YGValueZero;
- }
- return &YGValueAuto;
-}
-
-#define YG_NODE_PROPERTY_IMPL(type, name, paramName, instanceName) \
- void YGNodeSet##name(const YGNodeRef node, type paramName) { \
- node->instanceName = paramName; \
- } \
- \
- type YGNodeGet##name(const YGNodeRef node) { \
- return node->instanceName; \
- }
-
-#define YG_NODE_STYLE_PROPERTY_SETTER_IMPL(type, name, paramName, instanceName) \
- void YGNodeStyleSet##name(const YGNodeRef node, const type paramName) { \
- if (node->style.instanceName != paramName) { \
- node->style.instanceName = paramName; \
- YGNodeMarkDirtyInternal(node); \
- } \
- }
-
-#define YG_NODE_STYLE_PROPERTY_SETTER_UNIT_IMPL( \
- type, name, paramName, instanceName) \
- void YGNodeStyleSet##name(const YGNodeRef node, const type paramName) { \
- YGValue value = { \
- .value = paramName, \
- .unit = YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
- }; \
- if ((node->style.instanceName.value != value.value && \
- value.unit != YGUnitUndefined) || \
- node->style.instanceName.unit != value.unit) { \
- node->style.instanceName = value; \
- YGNodeMarkDirtyInternal(node); \
- } \
- } \
- \
- void YGNodeStyleSet##name##Percent( \
- const YGNodeRef node, const type paramName) { \
- YGValue value = { \
- .value = paramName, \
- .unit = \
- YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPercent, \
- }; \
- if ((node->style.instanceName.value != value.value && \
- value.unit != YGUnitUndefined) || \
- node->style.instanceName.unit != value.unit) { \
- node->style.instanceName = value; \
- YGNodeMarkDirtyInternal(node); \
- } \
- }
-
-#define YG_NODE_STYLE_PROPERTY_SETTER_UNIT_AUTO_IMPL( \
- type, name, paramName, instanceName) \
- void YGNodeStyleSet##name(const YGNodeRef node, const type paramName) { \
- YGValue value = { \
- .value = paramName, \
- .unit = YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
- }; \
- if ((node->style.instanceName.value != value.value && \
- value.unit != YGUnitUndefined) || \
- node->style.instanceName.unit != value.unit) { \
- node->style.instanceName = value; \
- YGNodeMarkDirtyInternal(node); \
- } \
- } \
- \
- void YGNodeStyleSet##name##Percent( \
- const YGNodeRef node, const type paramName) { \
- if (node->style.instanceName.value != paramName || \
- node->style.instanceName.unit != YGUnitPercent) { \
- node->style.instanceName.value = paramName; \
- node->style.instanceName.unit = \
- YGFloatIsUndefined(paramName) ? YGUnitAuto : YGUnitPercent; \
- YGNodeMarkDirtyInternal(node); \
- } \
- } \
- \
- void YGNodeStyleSet##name##Auto(const YGNodeRef node) { \
- if (node->style.instanceName.unit != YGUnitAuto) { \
- node->style.instanceName.value = YGUndefined; \
- node->style.instanceName.unit = YGUnitAuto; \
- YGNodeMarkDirtyInternal(node); \
- } \
- }
-
-#define YG_NODE_STYLE_PROPERTY_IMPL(type, name, paramName, instanceName) \
- YG_NODE_STYLE_PROPERTY_SETTER_IMPL(type, name, paramName, instanceName) \
- \
- type YGNodeStyleGet##name(const YGNodeRef node) { \
- return node->style.instanceName; \
- }
-
-#define YG_NODE_STYLE_PROPERTY_UNIT_IMPL(type, name, paramName, instanceName) \
- YG_NODE_STYLE_PROPERTY_SETTER_UNIT_IMPL(float, name, paramName, instanceName) \
- \
- type YGNodeStyleGet##name(const YGNodeRef node) { \
- return node->style.instanceName; \
- }
-
-#define YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(type, name, paramName, instanceName) \
- YG_NODE_STYLE_PROPERTY_SETTER_UNIT_AUTO_IMPL(float, name, paramName, instanceName) \
- \
- type YGNodeStyleGet##name(const YGNodeRef node) { \
- return node->style.instanceName; \
- }
-
-#define YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO_IMPL(type, name, instanceName) \
- void YGNodeStyleSet##name##Auto(const YGNodeRef node, const YGEdge edge) { \
- if (node->style.instanceName[edge].unit != YGUnitAuto) { \
- node->style.instanceName[edge].value = YGUndefined; \
- node->style.instanceName[edge].unit = YGUnitAuto; \
- YGNodeMarkDirtyInternal(node); \
- } \
- }
-
-#define YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL( \
- type, name, paramName, instanceName) \
- void YGNodeStyleSet##name( \
- const YGNodeRef node, const YGEdge edge, const float paramName) { \
- YGValue value = { \
- .value = paramName, \
- .unit = YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
- }; \
- if ((node->style.instanceName[edge].value != value.value && \
- value.unit != YGUnitUndefined) || \
- node->style.instanceName[edge].unit != value.unit) { \
- node->style.instanceName[edge] = value; \
- YGNodeMarkDirtyInternal(node); \
- } \
- } \
- \
- void YGNodeStyleSet##name##Percent( \
- const YGNodeRef node, const YGEdge edge, const float paramName) { \
- YGValue value = { \
- .value = paramName, \
- .unit = \
- YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPercent, \
- }; \
- if ((node->style.instanceName[edge].value != value.value && \
- value.unit != YGUnitUndefined) || \
- node->style.instanceName[edge].unit != value.unit) { \
- node->style.instanceName[edge] = value; \
- YGNodeMarkDirtyInternal(node); \
- } \
- } \
- \
- WIN_STRUCT(type) \
- YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge) { \
- return WIN_STRUCT_REF(node->style.instanceName[edge]); \
- }
-
-#define YG_NODE_STYLE_EDGE_PROPERTY_IMPL(type, name, paramName, instanceName) \
- void YGNodeStyleSet##name( \
- const YGNodeRef node, const YGEdge edge, const float paramName) { \
- YGValue value = { \
- .value = paramName, \
- .unit = YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
- }; \
- if ((node->style.instanceName[edge].value != value.value && \
- value.unit != YGUnitUndefined) || \
- node->style.instanceName[edge].unit != value.unit) { \
- node->style.instanceName[edge] = value; \
- YGNodeMarkDirtyInternal(node); \
- } \
- } \
- \
- float YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge) { \
- return node->style.instanceName[edge].value; \
- }
-
-#define YG_NODE_LAYOUT_PROPERTY_IMPL(type, name, instanceName) \
- type YGNodeLayoutGet##name(const YGNodeRef node) { \
- return node->layout.instanceName; \
- }
-
-#define YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(type, name, instanceName) \
- type YGNodeLayoutGet##name(const YGNodeRef node, const YGEdge edge) { \
- YGAssertWithNode( \
- node, \
- edge <= YGEdgeEnd, \
- "Cannot get layout properties of multi-edge shorthands"); \
- \
- if (edge == YGEdgeLeft) { \
- if (node->layout.direction == YGDirectionRTL) { \
- return node->layout.instanceName[YGEdgeEnd]; \
- } else { \
- return node->layout.instanceName[YGEdgeStart]; \
- } \
- } \
- \
- if (edge == YGEdgeRight) { \
- if (node->layout.direction == YGDirectionRTL) { \
- return node->layout.instanceName[YGEdgeStart]; \
- } else { \
- return node->layout.instanceName[YGEdgeEnd]; \
- } \
- } \
- \
- return node->layout.instanceName[edge]; \
- }
-
-YG_NODE_PROPERTY_IMPL(void *, Context, context, context);
-YG_NODE_PROPERTY_IMPL(YGPrintFunc, PrintFunc, printFunc, print);
-YG_NODE_PROPERTY_IMPL(bool, HasNewLayout, hasNewLayout, hasNewLayout);
-YG_NODE_PROPERTY_IMPL(YGNodeType, NodeType, nodeType, nodeType);
-
-YG_NODE_STYLE_PROPERTY_IMPL(YGDirection, Direction, direction, direction);
-YG_NODE_STYLE_PROPERTY_IMPL(YGFlexDirection, FlexDirection, flexDirection, flexDirection);
-YG_NODE_STYLE_PROPERTY_IMPL(YGJustify, JustifyContent, justifyContent, justifyContent);
-YG_NODE_STYLE_PROPERTY_IMPL(YGAlign, AlignContent, alignContent, alignContent);
-YG_NODE_STYLE_PROPERTY_IMPL(YGAlign, AlignItems, alignItems, alignItems);
-YG_NODE_STYLE_PROPERTY_IMPL(YGAlign, AlignSelf, alignSelf, alignSelf);
-YG_NODE_STYLE_PROPERTY_IMPL(YGPositionType, PositionType, positionType, positionType);
-YG_NODE_STYLE_PROPERTY_IMPL(YGWrap, FlexWrap, flexWrap, flexWrap);
-YG_NODE_STYLE_PROPERTY_IMPL(YGOverflow, Overflow, overflow, overflow);
-YG_NODE_STYLE_PROPERTY_IMPL(YGDisplay, Display, display, display);
-
-YG_NODE_STYLE_PROPERTY_IMPL(float, Flex, flex, flex);
-YG_NODE_STYLE_PROPERTY_SETTER_IMPL(float, FlexGrow, flexGrow, flexGrow);
-YG_NODE_STYLE_PROPERTY_SETTER_IMPL(float, FlexShrink, flexShrink, flexShrink);
-YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(YGValue, FlexBasis, flexBasis, flexBasis);
-
-YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Position, position, position);
-YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Margin, margin, margin);
-YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Margin, margin);
-YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Padding, padding, padding);
-YG_NODE_STYLE_EDGE_PROPERTY_IMPL(float, Border, border, border);
-
-YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Width, width, dimensions[YGDimensionWidth]);
-YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Height, height, dimensions[YGDimensionHeight]);
-YG_NODE_STYLE_PROPERTY_UNIT_IMPL(YGValue, MinWidth, minWidth, minDimensions[YGDimensionWidth]);
-YG_NODE_STYLE_PROPERTY_UNIT_IMPL(YGValue, MinHeight, minHeight, minDimensions[YGDimensionHeight]);
-YG_NODE_STYLE_PROPERTY_UNIT_IMPL(YGValue, MaxWidth, maxWidth, maxDimensions[YGDimensionWidth]);
-YG_NODE_STYLE_PROPERTY_UNIT_IMPL(YGValue, MaxHeight, maxHeight, maxDimensions[YGDimensionHeight]);
-
-// Yoga specific properties, not compatible with flexbox specification
-YG_NODE_STYLE_PROPERTY_IMPL(float, AspectRatio, aspectRatio, aspectRatio);
-
-YG_NODE_LAYOUT_PROPERTY_IMPL(float, Left, position[YGEdgeLeft]);
-YG_NODE_LAYOUT_PROPERTY_IMPL(float, Top, position[YGEdgeTop]);
-YG_NODE_LAYOUT_PROPERTY_IMPL(float, Right, position[YGEdgeRight]);
-YG_NODE_LAYOUT_PROPERTY_IMPL(float, Bottom, position[YGEdgeBottom]);
-YG_NODE_LAYOUT_PROPERTY_IMPL(float, Width, dimensions[YGDimensionWidth]);
-YG_NODE_LAYOUT_PROPERTY_IMPL(float, Height, dimensions[YGDimensionHeight]);
-YG_NODE_LAYOUT_PROPERTY_IMPL(YGDirection, Direction, direction);
-YG_NODE_LAYOUT_PROPERTY_IMPL(bool, HadOverflow, hadOverflow);
-
-YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Margin, margin);
-YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Border, border);
-YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Padding, padding);
-
-uint32_t gCurrentGenerationCount = 0;
-
-bool YGLayoutNodeInternal(const YGNodeRef node,
- const float availableWidth,
- const float availableHeight,
- const YGDirection parentDirection,
- const YGMeasureMode widthMeasureMode,
- const YGMeasureMode heightMeasureMode,
- const float parentWidth,
- const float parentHeight,
- const bool performLayout,
- const char *reason,
- const YGConfigRef config);
-
-bool YGValueEqual(const YGValue a, const YGValue b) {
- if (a.unit != b.unit) {
- return false;
- }
-
- if (a.unit == YGUnitUndefined) {
- return true;
- }
-
- return fabs(a.value - b.value) < 0.0001f;
-}
-
-static inline void YGResolveDimensions(YGNodeRef node) {
- for (uint32_t dim = YGDimensionWidth; dim < YGDimensionCount; dim++) {
- if (node->style.maxDimensions[dim].unit != YGUnitUndefined &&
- YGValueEqual(node->style.maxDimensions[dim], node->style.minDimensions[dim])) {
- node->resolvedDimensions[dim] = &node->style.maxDimensions[dim];
- } else {
- node->resolvedDimensions[dim] = &node->style.dimensions[dim];
- }
- }
-}
-
-bool YGFloatsEqual(const float a, const float b) {
- if (YGFloatIsUndefined(a)) {
- return YGFloatIsUndefined(b);
- }
- return fabs(a - b) < 0.0001f;
-}
-
-static void YGNodePrintInternal(const YGNodeRef node,
- const YGPrintOptions options) {
- std::string str;
- facebook::yoga::YGNodeToString(&str, node, options, 0);
- YGLog(node, YGLogLevelDebug, str.c_str());
-}
-
-void YGNodePrint(const YGNodeRef node, const YGPrintOptions options) {
- YGNodePrintInternal(node, options);
-}
-
-static const YGEdge leading[4] = {
- [YGFlexDirectionColumn] = YGEdgeTop,
- [YGFlexDirectionColumnReverse] = YGEdgeBottom,
- [YGFlexDirectionRow] = YGEdgeLeft,
- [YGFlexDirectionRowReverse] = YGEdgeRight,
-};
-static const YGEdge trailing[4] = {
- [YGFlexDirectionColumn] = YGEdgeBottom,
- [YGFlexDirectionColumnReverse] = YGEdgeTop,
- [YGFlexDirectionRow] = YGEdgeRight,
- [YGFlexDirectionRowReverse] = YGEdgeLeft,
-};
-static const YGEdge pos[4] = {
- [YGFlexDirectionColumn] = YGEdgeTop,
- [YGFlexDirectionColumnReverse] = YGEdgeBottom,
- [YGFlexDirectionRow] = YGEdgeLeft,
- [YGFlexDirectionRowReverse] = YGEdgeRight,
-};
-static const YGDimension dim[4] = {
- [YGFlexDirectionColumn] = YGDimensionHeight,
- [YGFlexDirectionColumnReverse] = YGDimensionHeight,
- [YGFlexDirectionRow] = YGDimensionWidth,
- [YGFlexDirectionRowReverse] = YGDimensionWidth,
-};
-
-static inline bool YGFlexDirectionIsRow(const YGFlexDirection flexDirection) {
- return flexDirection == YGFlexDirectionRow || flexDirection == YGFlexDirectionRowReverse;
-}
-
-static inline bool YGFlexDirectionIsColumn(const YGFlexDirection flexDirection) {
- return flexDirection == YGFlexDirectionColumn || flexDirection == YGFlexDirectionColumnReverse;
-}
-
-static inline float YGNodeLeadingMargin(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- if (YGFlexDirectionIsRow(axis) && node->style.margin[YGEdgeStart].unit != YGUnitUndefined) {
- return YGResolveValueMargin(&node->style.margin[YGEdgeStart], widthSize);
- }
-
- return YGResolveValueMargin(YGComputedEdgeValue(node->style.margin, leading[axis], &YGValueZero),
- widthSize);
-}
-
-static float YGNodeTrailingMargin(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- if (YGFlexDirectionIsRow(axis) && node->style.margin[YGEdgeEnd].unit != YGUnitUndefined) {
- return YGResolveValueMargin(&node->style.margin[YGEdgeEnd], widthSize);
- }
-
- return YGResolveValueMargin(YGComputedEdgeValue(node->style.margin, trailing[axis], &YGValueZero),
- widthSize);
-}
-
-static float YGNodeLeadingPadding(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- if (YGFlexDirectionIsRow(axis) && node->style.padding[YGEdgeStart].unit != YGUnitUndefined &&
- YGResolveValue(&node->style.padding[YGEdgeStart], widthSize) >= 0.0f) {
- return YGResolveValue(&node->style.padding[YGEdgeStart], widthSize);
- }
-
- return fmaxf(YGResolveValue(YGComputedEdgeValue(node->style.padding, leading[axis], &YGValueZero),
- widthSize),
- 0.0f);
-}
-
-static float YGNodeTrailingPadding(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- if (YGFlexDirectionIsRow(axis) && node->style.padding[YGEdgeEnd].unit != YGUnitUndefined &&
- YGResolveValue(&node->style.padding[YGEdgeEnd], widthSize) >= 0.0f) {
- return YGResolveValue(&node->style.padding[YGEdgeEnd], widthSize);
- }
-
- return fmaxf(YGResolveValue(YGComputedEdgeValue(node->style.padding, trailing[axis], &YGValueZero),
- widthSize),
- 0.0f);
-}
-
-static float YGNodeLeadingBorder(const YGNodeRef node, const YGFlexDirection axis) {
- if (YGFlexDirectionIsRow(axis) && node->style.border[YGEdgeStart].unit != YGUnitUndefined &&
- node->style.border[YGEdgeStart].value >= 0.0f) {
- return node->style.border[YGEdgeStart].value;
- }
-
- return fmaxf(YGComputedEdgeValue(node->style.border, leading[axis], &YGValueZero)->value, 0.0f);
-}
-
-static float YGNodeTrailingBorder(const YGNodeRef node, const YGFlexDirection axis) {
- if (YGFlexDirectionIsRow(axis) && node->style.border[YGEdgeEnd].unit != YGUnitUndefined &&
- node->style.border[YGEdgeEnd].value >= 0.0f) {
- return node->style.border[YGEdgeEnd].value;
- }
-
- return fmaxf(YGComputedEdgeValue(node->style.border, trailing[axis], &YGValueZero)->value, 0.0f);
-}
-
-static inline float YGNodeLeadingPaddingAndBorder(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- return YGNodeLeadingPadding(node, axis, widthSize) + YGNodeLeadingBorder(node, axis);
-}
-
-static inline float YGNodeTrailingPaddingAndBorder(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- return YGNodeTrailingPadding(node, axis, widthSize) + YGNodeTrailingBorder(node, axis);
-}
-
-static inline float YGNodeMarginForAxis(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- return YGNodeLeadingMargin(node, axis, widthSize) + YGNodeTrailingMargin(node, axis, widthSize);
-}
-
-static inline float YGNodePaddingAndBorderForAxis(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- return YGNodeLeadingPaddingAndBorder(node, axis, widthSize) +
- YGNodeTrailingPaddingAndBorder(node, axis, widthSize);
-}
-
-static inline YGAlign YGNodeAlignItem(const YGNodeRef node, const YGNodeRef child) {
- const YGAlign align =
- child->style.alignSelf == YGAlignAuto ? node->style.alignItems : child->style.alignSelf;
- if (align == YGAlignBaseline && YGFlexDirectionIsColumn(node->style.flexDirection)) {
- return YGAlignFlexStart;
- }
- return align;
-}
-
-static inline YGDirection YGNodeResolveDirection(const YGNodeRef node,
- const YGDirection parentDirection) {
- if (node->style.direction == YGDirectionInherit) {
- return parentDirection > YGDirectionInherit ? parentDirection : YGDirectionLTR;
- } else {
- return node->style.direction;
- }
-}
-
-static float YGBaseline(const YGNodeRef node) {
- if (node->baseline != nullptr) {
- const float baseline = node->baseline(node,
- node->layout.measuredDimensions[YGDimensionWidth],
- node->layout.measuredDimensions[YGDimensionHeight]);
- YGAssertWithNode(node,
- !YGFloatIsUndefined(baseline),
- "Expect custom baseline function to not return NaN");
- return baseline;
- }
-
- YGNodeRef baselineChild = nullptr;
- const uint32_t childCount = YGNodeGetChildCount(node);
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef child = YGNodeGetChild(node, i);
- if (child->lineIndex > 0) {
- break;
- }
- if (child->style.positionType == YGPositionTypeAbsolute) {
- continue;
- }
- if (YGNodeAlignItem(node, child) == YGAlignBaseline) {
- baselineChild = child;
- break;
- }
-
- if (baselineChild == nullptr) {
- baselineChild = child;
- }
- }
-
- if (baselineChild == nullptr) {
- return node->layout.measuredDimensions[YGDimensionHeight];
- }
-
- const float baseline = YGBaseline(baselineChild);
- return baseline + baselineChild->layout.position[YGEdgeTop];
-}
-
-static inline YGFlexDirection YGResolveFlexDirection(const YGFlexDirection flexDirection,
- const YGDirection direction) {
- if (direction == YGDirectionRTL) {
- if (flexDirection == YGFlexDirectionRow) {
- return YGFlexDirectionRowReverse;
- } else if (flexDirection == YGFlexDirectionRowReverse) {
- return YGFlexDirectionRow;
- }
- }
-
- return flexDirection;
-}
-
-static YGFlexDirection YGFlexDirectionCross(const YGFlexDirection flexDirection,
- const YGDirection direction) {
- return YGFlexDirectionIsColumn(flexDirection)
- ? YGResolveFlexDirection(YGFlexDirectionRow, direction)
- : YGFlexDirectionColumn;
-}
-
-static inline bool YGNodeIsFlex(const YGNodeRef node) {
- return (node->style.positionType == YGPositionTypeRelative &&
- (YGResolveFlexGrow(node) != 0 || YGNodeResolveFlexShrink(node) != 0));
-}
-
-static bool YGIsBaselineLayout(const YGNodeRef node) {
- if (YGFlexDirectionIsColumn(node->style.flexDirection)) {
- return false;
- }
- if (node->style.alignItems == YGAlignBaseline) {
- return true;
- }
- const uint32_t childCount = YGNodeGetChildCount(node);
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef child = YGNodeGetChild(node, i);
- if (child->style.positionType == YGPositionTypeRelative &&
- child->style.alignSelf == YGAlignBaseline) {
- return true;
- }
- }
-
- return false;
-}
-
-static inline float YGNodeDimWithMargin(const YGNodeRef node,
- const YGFlexDirection axis,
- const float widthSize) {
- return node->layout.measuredDimensions[dim[axis]] + YGNodeLeadingMargin(node, axis, widthSize) +
- YGNodeTrailingMargin(node, axis, widthSize);
-}
-
-static inline bool YGNodeIsStyleDimDefined(const YGNodeRef node,
- const YGFlexDirection axis,
- const float parentSize) {
- return !(node->resolvedDimensions[dim[axis]]->unit == YGUnitAuto ||
- node->resolvedDimensions[dim[axis]]->unit == YGUnitUndefined ||
- (node->resolvedDimensions[dim[axis]]->unit == YGUnitPoint &&
- node->resolvedDimensions[dim[axis]]->value < 0.0f) ||
- (node->resolvedDimensions[dim[axis]]->unit == YGUnitPercent &&
- (node->resolvedDimensions[dim[axis]]->value < 0.0f || YGFloatIsUndefined(parentSize))));
-}
-
-static inline bool YGNodeIsLayoutDimDefined(const YGNodeRef node, const YGFlexDirection axis) {
- const float value = node->layout.measuredDimensions[dim[axis]];
- return !YGFloatIsUndefined(value) && value >= 0.0f;
-}
-
-static inline bool YGNodeIsLeadingPosDefined(const YGNodeRef node, const YGFlexDirection axis) {
- return (YGFlexDirectionIsRow(axis) &&
- YGComputedEdgeValue(node->style.position, YGEdgeStart, &YGValueUndefined)->unit !=
- YGUnitUndefined) ||
- YGComputedEdgeValue(node->style.position, leading[axis], &YGValueUndefined)->unit !=
- YGUnitUndefined;
-}
-
-static inline bool YGNodeIsTrailingPosDefined(const YGNodeRef node, const YGFlexDirection axis) {
- return (YGFlexDirectionIsRow(axis) &&
- YGComputedEdgeValue(node->style.position, YGEdgeEnd, &YGValueUndefined)->unit !=
- YGUnitUndefined) ||
- YGComputedEdgeValue(node->style.position, trailing[axis], &YGValueUndefined)->unit !=
- YGUnitUndefined;
-}
-
-static float YGNodeLeadingPosition(const YGNodeRef node,
- const YGFlexDirection axis,
- const float axisSize) {
- if (YGFlexDirectionIsRow(axis)) {
- const YGValue *leadingPosition =
- YGComputedEdgeValue(node->style.position, YGEdgeStart, &YGValueUndefined);
- if (leadingPosition->unit != YGUnitUndefined) {
- return YGResolveValue(leadingPosition, axisSize);
- }
- }
-
- const YGValue *leadingPosition =
- YGComputedEdgeValue(node->style.position, leading[axis], &YGValueUndefined);
-
- return leadingPosition->unit == YGUnitUndefined ? 0.0f
- : YGResolveValue(leadingPosition, axisSize);
-}
-
-static float YGNodeTrailingPosition(const YGNodeRef node,
- const YGFlexDirection axis,
- const float axisSize) {
- if (YGFlexDirectionIsRow(axis)) {
- const YGValue *trailingPosition =
- YGComputedEdgeValue(node->style.position, YGEdgeEnd, &YGValueUndefined);
- if (trailingPosition->unit != YGUnitUndefined) {
- return YGResolveValue(trailingPosition, axisSize);
- }
- }
-
- const YGValue *trailingPosition =
- YGComputedEdgeValue(node->style.position, trailing[axis], &YGValueUndefined);
-
- return trailingPosition->unit == YGUnitUndefined ? 0.0f
- : YGResolveValue(trailingPosition, axisSize);
-}
-
-static float YGNodeBoundAxisWithinMinAndMax(const YGNodeRef node,
- const YGFlexDirection axis,
- const float value,
- const float axisSize) {
- float min = YGUndefined;
- float max = YGUndefined;
-
- if (YGFlexDirectionIsColumn(axis)) {
- min = YGResolveValue(&node->style.minDimensions[YGDimensionHeight], axisSize);
- max = YGResolveValue(&node->style.maxDimensions[YGDimensionHeight], axisSize);
- } else if (YGFlexDirectionIsRow(axis)) {
- min = YGResolveValue(&node->style.minDimensions[YGDimensionWidth], axisSize);
- max = YGResolveValue(&node->style.maxDimensions[YGDimensionWidth], axisSize);
- }
-
- float boundValue = value;
-
- if (!YGFloatIsUndefined(max) && max >= 0.0f && boundValue > max) {
- boundValue = max;
- }
-
- if (!YGFloatIsUndefined(min) && min >= 0.0f && boundValue < min) {
- boundValue = min;
- }
-
- return boundValue;
-}
-
-static inline YGValue *YGMarginLeadingValue(const YGNodeRef node, const YGFlexDirection axis) {
- if (YGFlexDirectionIsRow(axis) && node->style.margin[YGEdgeStart].unit != YGUnitUndefined) {
- return &node->style.margin[YGEdgeStart];
- } else {
- return &node->style.margin[leading[axis]];
- }
-}
-
-static inline YGValue *YGMarginTrailingValue(const YGNodeRef node, const YGFlexDirection axis) {
- if (YGFlexDirectionIsRow(axis) && node->style.margin[YGEdgeEnd].unit != YGUnitUndefined) {
- return &node->style.margin[YGEdgeEnd];
- } else {
- return &node->style.margin[trailing[axis]];
- }
-}
-
-// Like YGNodeBoundAxisWithinMinAndMax but also ensures that the value doesn't go
-// below the
-// padding and border amount.
-static inline float YGNodeBoundAxis(const YGNodeRef node,
- const YGFlexDirection axis,
- const float value,
- const float axisSize,
- const float widthSize) {
- return fmaxf(YGNodeBoundAxisWithinMinAndMax(node, axis, value, axisSize),
- YGNodePaddingAndBorderForAxis(node, axis, widthSize));
-}
-
-static void YGNodeSetChildTrailingPosition(const YGNodeRef node,
- const YGNodeRef child,
- const YGFlexDirection axis) {
- const float size = child->layout.measuredDimensions[dim[axis]];
- child->layout.position[trailing[axis]] =
- node->layout.measuredDimensions[dim[axis]] - size - child->layout.position[pos[axis]];
-}
-
-// If both left and right are defined, then use left. Otherwise return
-// +left or -right depending on which is defined.
-static float YGNodeRelativePosition(const YGNodeRef node,
- const YGFlexDirection axis,
- const float axisSize) {
- return YGNodeIsLeadingPosDefined(node, axis) ? YGNodeLeadingPosition(node, axis, axisSize)
- : -YGNodeTrailingPosition(node, axis, axisSize);
-}
-
-static void YGConstrainMaxSizeForMode(const YGNodeRef node,
- const enum YGFlexDirection axis,
- const float parentAxisSize,
- const float parentWidth,
- YGMeasureMode *mode,
- float *size) {
- const float maxSize = YGResolveValue(&node->style.maxDimensions[dim[axis]], parentAxisSize) +
- YGNodeMarginForAxis(node, axis, parentWidth);
- switch (*mode) {
- case YGMeasureModeExactly:
- case YGMeasureModeAtMost:
- *size = (YGFloatIsUndefined(maxSize) || *size < maxSize) ? *size : maxSize;
- break;
- case YGMeasureModeUndefined:
- if (!YGFloatIsUndefined(maxSize)) {
- *mode = YGMeasureModeAtMost;
- *size = maxSize;
- }
- break;
- }
-}
-
-static void YGNodeSetPosition(const YGNodeRef node,
- const YGDirection direction,
- const float mainSize,
- const float crossSize,
- const float parentWidth) {
- /* Root nodes should be always layouted as LTR, so we don't return negative values. */
- const YGDirection directionRespectingRoot =
- node->parent != nullptr ? direction : YGDirectionLTR;
- const YGFlexDirection mainAxis =
- YGResolveFlexDirection(node->style.flexDirection, directionRespectingRoot);
- const YGFlexDirection crossAxis = YGFlexDirectionCross(mainAxis, directionRespectingRoot);
-
- const float relativePositionMain = YGNodeRelativePosition(node, mainAxis, mainSize);
- const float relativePositionCross = YGNodeRelativePosition(node, crossAxis, crossSize);
-
- node->layout.position[leading[mainAxis]] =
- YGNodeLeadingMargin(node, mainAxis, parentWidth) + relativePositionMain;
- node->layout.position[trailing[mainAxis]] =
- YGNodeTrailingMargin(node, mainAxis, parentWidth) + relativePositionMain;
- node->layout.position[leading[crossAxis]] =
- YGNodeLeadingMargin(node, crossAxis, parentWidth) + relativePositionCross;
- node->layout.position[trailing[crossAxis]] =
- YGNodeTrailingMargin(node, crossAxis, parentWidth) + relativePositionCross;
-}
-
-static void YGNodeComputeFlexBasisForChild(const YGNodeRef node,
- const YGNodeRef child,
- const float width,
- const YGMeasureMode widthMode,
- const float height,
- const float parentWidth,
- const float parentHeight,
- const YGMeasureMode heightMode,
- const YGDirection direction,
- const YGConfigRef config) {
- const YGFlexDirection mainAxis = YGResolveFlexDirection(node->style.flexDirection, direction);
- const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
- const float mainAxisSize = isMainAxisRow ? width : height;
- const float mainAxisParentSize = isMainAxisRow ? parentWidth : parentHeight;
-
- float childWidth;
- float childHeight;
- YGMeasureMode childWidthMeasureMode;
- YGMeasureMode childHeightMeasureMode;
-
- const float resolvedFlexBasis =
- YGResolveValue(YGNodeResolveFlexBasisPtr(child), mainAxisParentSize);
- const bool isRowStyleDimDefined = YGNodeIsStyleDimDefined(child, YGFlexDirectionRow, parentWidth);
- const bool isColumnStyleDimDefined =
- YGNodeIsStyleDimDefined(child, YGFlexDirectionColumn, parentHeight);
-
- if (!YGFloatIsUndefined(resolvedFlexBasis) && !YGFloatIsUndefined(mainAxisSize)) {
- if (YGFloatIsUndefined(child->layout.computedFlexBasis) ||
- (YGConfigIsExperimentalFeatureEnabled(child->config, YGExperimentalFeatureWebFlexBasis) &&
- child->layout.computedFlexBasisGeneration != gCurrentGenerationCount)) {
- child->layout.computedFlexBasis =
- fmaxf(resolvedFlexBasis, YGNodePaddingAndBorderForAxis(child, mainAxis, parentWidth));
- }
- } else if (isMainAxisRow && isRowStyleDimDefined) {
- // The width is definite, so use that as the flex basis.
- child->layout.computedFlexBasis =
- fmaxf(YGResolveValue(child->resolvedDimensions[YGDimensionWidth], parentWidth),
- YGNodePaddingAndBorderForAxis(child, YGFlexDirectionRow, parentWidth));
- } else if (!isMainAxisRow && isColumnStyleDimDefined) {
- // The height is definite, so use that as the flex basis.
- child->layout.computedFlexBasis =
- fmaxf(YGResolveValue(child->resolvedDimensions[YGDimensionHeight], parentHeight),
- YGNodePaddingAndBorderForAxis(child, YGFlexDirectionColumn, parentWidth));
- } else {
- // Compute the flex basis and hypothetical main size (i.e. the clamped
- // flex basis).
- childWidth = YGUndefined;
- childHeight = YGUndefined;
- childWidthMeasureMode = YGMeasureModeUndefined;
- childHeightMeasureMode = YGMeasureModeUndefined;
-
- const float marginRow = YGNodeMarginForAxis(child, YGFlexDirectionRow, parentWidth);
- const float marginColumn = YGNodeMarginForAxis(child, YGFlexDirectionColumn, parentWidth);
-
- if (isRowStyleDimDefined) {
- childWidth =
- YGResolveValue(child->resolvedDimensions[YGDimensionWidth], parentWidth) + marginRow;
- childWidthMeasureMode = YGMeasureModeExactly;
- }
- if (isColumnStyleDimDefined) {
- childHeight =
- YGResolveValue(child->resolvedDimensions[YGDimensionHeight], parentHeight) + marginColumn;
- childHeightMeasureMode = YGMeasureModeExactly;
- }
-
- // The W3C spec doesn't say anything about the 'overflow' property,
- // but all major browsers appear to implement the following logic.
- if ((!isMainAxisRow && node->style.overflow == YGOverflowScroll) ||
- node->style.overflow != YGOverflowScroll) {
- if (YGFloatIsUndefined(childWidth) && !YGFloatIsUndefined(width)) {
- childWidth = width;
- childWidthMeasureMode = YGMeasureModeAtMost;
- }
- }
-
- if ((isMainAxisRow && node->style.overflow == YGOverflowScroll) ||
- node->style.overflow != YGOverflowScroll) {
- if (YGFloatIsUndefined(childHeight) && !YGFloatIsUndefined(height)) {
- childHeight = height;
- childHeightMeasureMode = YGMeasureModeAtMost;
- }
- }
-
- if (!YGFloatIsUndefined(child->style.aspectRatio)) {
- if (!isMainAxisRow && childWidthMeasureMode == YGMeasureModeExactly) {
- childHeight = (childWidth - marginRow) / child->style.aspectRatio;
- childHeightMeasureMode = YGMeasureModeExactly;
- } else if (isMainAxisRow && childHeightMeasureMode == YGMeasureModeExactly) {
- childWidth = (childHeight - marginColumn) * child->style.aspectRatio;
- childWidthMeasureMode = YGMeasureModeExactly;
- }
- }
-
- // If child has no defined size in the cross axis and is set to stretch,
- // set the cross
- // axis to be measured exactly with the available inner width
-
- const bool hasExactWidth = !YGFloatIsUndefined(width) && widthMode == YGMeasureModeExactly;
- const bool childWidthStretch = YGNodeAlignItem(node, child) == YGAlignStretch &&
- childWidthMeasureMode != YGMeasureModeExactly;
- if (!isMainAxisRow && !isRowStyleDimDefined && hasExactWidth && childWidthStretch) {
- childWidth = width;
- childWidthMeasureMode = YGMeasureModeExactly;
- if (!YGFloatIsUndefined(child->style.aspectRatio)) {
- childHeight = (childWidth - marginRow) / child->style.aspectRatio;
- childHeightMeasureMode = YGMeasureModeExactly;
- }
- }
-
- const bool hasExactHeight = !YGFloatIsUndefined(height) && heightMode == YGMeasureModeExactly;
- const bool childHeightStretch = YGNodeAlignItem(node, child) == YGAlignStretch &&
- childHeightMeasureMode != YGMeasureModeExactly;
- if (isMainAxisRow && !isColumnStyleDimDefined && hasExactHeight && childHeightStretch) {
- childHeight = height;
- childHeightMeasureMode = YGMeasureModeExactly;
-
- if (!YGFloatIsUndefined(child->style.aspectRatio)) {
- childWidth = (childHeight - marginColumn) * child->style.aspectRatio;
- childWidthMeasureMode = YGMeasureModeExactly;
- }
- }
-
- YGConstrainMaxSizeForMode(
- child, YGFlexDirectionRow, parentWidth, parentWidth, &childWidthMeasureMode, &childWidth);
- YGConstrainMaxSizeForMode(child,
- YGFlexDirectionColumn,
- parentHeight,
- parentWidth,
- &childHeightMeasureMode,
- &childHeight);
-
- // Measure the child
- YGLayoutNodeInternal(child,
- childWidth,
- childHeight,
- direction,
- childWidthMeasureMode,
- childHeightMeasureMode,
- parentWidth,
- parentHeight,
- false,
- "measure",
- config);
-
- child->layout.computedFlexBasis =
- fmaxf(child->layout.measuredDimensions[dim[mainAxis]],
- YGNodePaddingAndBorderForAxis(child, mainAxis, parentWidth));
- }
-
- child->layout.computedFlexBasisGeneration = gCurrentGenerationCount;
-}
-
-static void YGNodeAbsoluteLayoutChild(const YGNodeRef node,
- const YGNodeRef child,
- const float width,
- const YGMeasureMode widthMode,
- const float height,
- const YGDirection direction,
- const YGConfigRef config) {
- const YGFlexDirection mainAxis = YGResolveFlexDirection(node->style.flexDirection, direction);
- const YGFlexDirection crossAxis = YGFlexDirectionCross(mainAxis, direction);
- const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
-
- float childWidth = YGUndefined;
- float childHeight = YGUndefined;
- YGMeasureMode childWidthMeasureMode = YGMeasureModeUndefined;
- YGMeasureMode childHeightMeasureMode = YGMeasureModeUndefined;
-
- const float marginRow = YGNodeMarginForAxis(child, YGFlexDirectionRow, width);
- const float marginColumn = YGNodeMarginForAxis(child, YGFlexDirectionColumn, width);
-
- if (YGNodeIsStyleDimDefined(child, YGFlexDirectionRow, width)) {
- childWidth = YGResolveValue(child->resolvedDimensions[YGDimensionWidth], width) + marginRow;
- } else {
- // If the child doesn't have a specified width, compute the width based
- // on the left/right
- // offsets if they're defined.
- if (YGNodeIsLeadingPosDefined(child, YGFlexDirectionRow) &&
- YGNodeIsTrailingPosDefined(child, YGFlexDirectionRow)) {
- childWidth = node->layout.measuredDimensions[YGDimensionWidth] -
- (YGNodeLeadingBorder(node, YGFlexDirectionRow) +
- YGNodeTrailingBorder(node, YGFlexDirectionRow)) -
- (YGNodeLeadingPosition(child, YGFlexDirectionRow, width) +
- YGNodeTrailingPosition(child, YGFlexDirectionRow, width));
- childWidth = YGNodeBoundAxis(child, YGFlexDirectionRow, childWidth, width, width);
- }
- }
-
- if (YGNodeIsStyleDimDefined(child, YGFlexDirectionColumn, height)) {
- childHeight =
- YGResolveValue(child->resolvedDimensions[YGDimensionHeight], height) + marginColumn;
- } else {
- // If the child doesn't have a specified height, compute the height
- // based on the top/bottom
- // offsets if they're defined.
- if (YGNodeIsLeadingPosDefined(child, YGFlexDirectionColumn) &&
- YGNodeIsTrailingPosDefined(child, YGFlexDirectionColumn)) {
- childHeight = node->layout.measuredDimensions[YGDimensionHeight] -
- (YGNodeLeadingBorder(node, YGFlexDirectionColumn) +
- YGNodeTrailingBorder(node, YGFlexDirectionColumn)) -
- (YGNodeLeadingPosition(child, YGFlexDirectionColumn, height) +
- YGNodeTrailingPosition(child, YGFlexDirectionColumn, height));
- childHeight = YGNodeBoundAxis(child, YGFlexDirectionColumn, childHeight, height, width);
- }
- }
-
- // Exactly one dimension needs to be defined for us to be able to do aspect ratio
- // calculation. One dimension being the anchor and the other being flexible.
- if (YGFloatIsUndefined(childWidth) ^ YGFloatIsUndefined(childHeight)) {
- if (!YGFloatIsUndefined(child->style.aspectRatio)) {
- if (YGFloatIsUndefined(childWidth)) {
- childWidth = marginRow + (childHeight - marginColumn) * child->style.aspectRatio;
- } else if (YGFloatIsUndefined(childHeight)) {
- childHeight = marginColumn + (childWidth - marginRow) / child->style.aspectRatio;
- }
- }
- }
-
- // If we're still missing one or the other dimension, measure the content.
- if (YGFloatIsUndefined(childWidth) || YGFloatIsUndefined(childHeight)) {
- childWidthMeasureMode =
- YGFloatIsUndefined(childWidth) ? YGMeasureModeUndefined : YGMeasureModeExactly;
- childHeightMeasureMode =
- YGFloatIsUndefined(childHeight) ? YGMeasureModeUndefined : YGMeasureModeExactly;
-
- // If the size of the parent is defined then try to constrain the absolute child to that size
- // as well. This allows text within the absolute child to wrap to the size of its parent.
- // This is the same behavior as many browsers implement.
- if (!isMainAxisRow && YGFloatIsUndefined(childWidth) && widthMode != YGMeasureModeUndefined &&
- width > 0) {
- childWidth = width;
- childWidthMeasureMode = YGMeasureModeAtMost;
- }
-
- YGLayoutNodeInternal(child,
- childWidth,
- childHeight,
- direction,
- childWidthMeasureMode,
- childHeightMeasureMode,
- childWidth,
- childHeight,
- false,
- "abs-measure",
- config);
- childWidth = child->layout.measuredDimensions[YGDimensionWidth] +
- YGNodeMarginForAxis(child, YGFlexDirectionRow, width);
- childHeight = child->layout.measuredDimensions[YGDimensionHeight] +
- YGNodeMarginForAxis(child, YGFlexDirectionColumn, width);
- }
-
- YGLayoutNodeInternal(child,
- childWidth,
- childHeight,
- direction,
- YGMeasureModeExactly,
- YGMeasureModeExactly,
- childWidth,
- childHeight,
- true,
- "abs-layout",
- config);
-
- if (YGNodeIsTrailingPosDefined(child, mainAxis) && !YGNodeIsLeadingPosDefined(child, mainAxis)) {
- child->layout.position[leading[mainAxis]] =
- node->layout.measuredDimensions[dim[mainAxis]] -
- child->layout.measuredDimensions[dim[mainAxis]] - YGNodeTrailingBorder(node, mainAxis) -
- YGNodeTrailingMargin(child, mainAxis, width) -
- YGNodeTrailingPosition(child, mainAxis, isMainAxisRow ? width : height);
- } else if (!YGNodeIsLeadingPosDefined(child, mainAxis) &&
- node->style.justifyContent == YGJustifyCenter) {
- child->layout.position[leading[mainAxis]] = (node->layout.measuredDimensions[dim[mainAxis]] -
- child->layout.measuredDimensions[dim[mainAxis]]) /
- 2.0f;
- } else if (!YGNodeIsLeadingPosDefined(child, mainAxis) &&
- node->style.justifyContent == YGJustifyFlexEnd) {
- child->layout.position[leading[mainAxis]] = (node->layout.measuredDimensions[dim[mainAxis]] -
- child->layout.measuredDimensions[dim[mainAxis]]);
- }
-
- if (YGNodeIsTrailingPosDefined(child, crossAxis) &&
- !YGNodeIsLeadingPosDefined(child, crossAxis)) {
- child->layout.position[leading[crossAxis]] =
- node->layout.measuredDimensions[dim[crossAxis]] -
- child->layout.measuredDimensions[dim[crossAxis]] - YGNodeTrailingBorder(node, crossAxis) -
- YGNodeTrailingMargin(child, crossAxis, width) -
- YGNodeTrailingPosition(child, crossAxis, isMainAxisRow ? height : width);
- } else if (!YGNodeIsLeadingPosDefined(child, crossAxis) &&
- YGNodeAlignItem(node, child) == YGAlignCenter) {
- child->layout.position[leading[crossAxis]] =
- (node->layout.measuredDimensions[dim[crossAxis]] -
- child->layout.measuredDimensions[dim[crossAxis]]) /
- 2.0f;
- } else if (!YGNodeIsLeadingPosDefined(child, crossAxis) &&
- ((YGNodeAlignItem(node, child) == YGAlignFlexEnd) ^
- (node->style.flexWrap == YGWrapWrapReverse))) {
- child->layout.position[leading[crossAxis]] = (node->layout.measuredDimensions[dim[crossAxis]] -
- child->layout.measuredDimensions[dim[crossAxis]]);
- }
-}
-
-static void YGNodeWithMeasureFuncSetMeasuredDimensions(const YGNodeRef node,
- const float availableWidth,
- const float availableHeight,
- const YGMeasureMode widthMeasureMode,
- const YGMeasureMode heightMeasureMode,
- const float parentWidth,
- const float parentHeight) {
- YGAssertWithNode(
- node,
- node->measure != nullptr,
- "Expected node to have custom measure function");
-
- const float paddingAndBorderAxisRow =
- YGNodePaddingAndBorderForAxis(node, YGFlexDirectionRow, availableWidth);
- const float paddingAndBorderAxisColumn =
- YGNodePaddingAndBorderForAxis(node, YGFlexDirectionColumn, availableWidth);
- const float marginAxisRow = YGNodeMarginForAxis(node, YGFlexDirectionRow, availableWidth);
- const float marginAxisColumn = YGNodeMarginForAxis(node, YGFlexDirectionColumn, availableWidth);
-
- // We want to make sure we don't call measure with negative size
- const float innerWidth = YGFloatIsUndefined(availableWidth)
- ? availableWidth
- : fmaxf(0, availableWidth - marginAxisRow - paddingAndBorderAxisRow);
- const float innerHeight =
- YGFloatIsUndefined(availableHeight)
- ? availableHeight
- : fmaxf(0, availableHeight - marginAxisColumn - paddingAndBorderAxisColumn);
-
- if (widthMeasureMode == YGMeasureModeExactly && heightMeasureMode == YGMeasureModeExactly) {
- // Don't bother sizing the text if both dimensions are already defined.
- node->layout.measuredDimensions[YGDimensionWidth] = YGNodeBoundAxis(
- node, YGFlexDirectionRow, availableWidth - marginAxisRow, parentWidth, parentWidth);
- node->layout.measuredDimensions[YGDimensionHeight] = YGNodeBoundAxis(
- node, YGFlexDirectionColumn, availableHeight - marginAxisColumn, parentHeight, parentWidth);
- } else {
- // Measure the text under the current constraints.
- const YGSize measuredSize =
- node->measure(node, innerWidth, widthMeasureMode, innerHeight, heightMeasureMode);
-
- node->layout.measuredDimensions[YGDimensionWidth] =
- YGNodeBoundAxis(node,
- YGFlexDirectionRow,
- (widthMeasureMode == YGMeasureModeUndefined ||
- widthMeasureMode == YGMeasureModeAtMost)
- ? measuredSize.width + paddingAndBorderAxisRow
- : availableWidth - marginAxisRow,
- parentWidth,
- parentWidth);
- node->layout.measuredDimensions[YGDimensionHeight] =
- YGNodeBoundAxis(node,
- YGFlexDirectionColumn,
- (heightMeasureMode == YGMeasureModeUndefined ||
- heightMeasureMode == YGMeasureModeAtMost)
- ? measuredSize.height + paddingAndBorderAxisColumn
- : availableHeight - marginAxisColumn,
- parentHeight,
- parentWidth);
- }
-}
-
-// For nodes with no children, use the available values if they were provided,
-// or the minimum size as indicated by the padding and border sizes.
-static void YGNodeEmptyContainerSetMeasuredDimensions(const YGNodeRef node,
- const float availableWidth,
- const float availableHeight,
- const YGMeasureMode widthMeasureMode,
- const YGMeasureMode heightMeasureMode,
- const float parentWidth,
- const float parentHeight) {
- const float paddingAndBorderAxisRow =
- YGNodePaddingAndBorderForAxis(node, YGFlexDirectionRow, parentWidth);
- const float paddingAndBorderAxisColumn =
- YGNodePaddingAndBorderForAxis(node, YGFlexDirectionColumn, parentWidth);
- const float marginAxisRow = YGNodeMarginForAxis(node, YGFlexDirectionRow, parentWidth);
- const float marginAxisColumn = YGNodeMarginForAxis(node, YGFlexDirectionColumn, parentWidth);
-
- node->layout.measuredDimensions[YGDimensionWidth] =
- YGNodeBoundAxis(node,
- YGFlexDirectionRow,
- (widthMeasureMode == YGMeasureModeUndefined ||
- widthMeasureMode == YGMeasureModeAtMost)
- ? paddingAndBorderAxisRow
- : availableWidth - marginAxisRow,
- parentWidth,
- parentWidth);
- node->layout.measuredDimensions[YGDimensionHeight] =
- YGNodeBoundAxis(node,
- YGFlexDirectionColumn,
- (heightMeasureMode == YGMeasureModeUndefined ||
- heightMeasureMode == YGMeasureModeAtMost)
- ? paddingAndBorderAxisColumn
- : availableHeight - marginAxisColumn,
- parentHeight,
- parentWidth);
-}
-
-static bool YGNodeFixedSizeSetMeasuredDimensions(const YGNodeRef node,
- const float availableWidth,
- const float availableHeight,
- const YGMeasureMode widthMeasureMode,
- const YGMeasureMode heightMeasureMode,
- const float parentWidth,
- const float parentHeight) {
- if ((widthMeasureMode == YGMeasureModeAtMost && availableWidth <= 0.0f) ||
- (heightMeasureMode == YGMeasureModeAtMost && availableHeight <= 0.0f) ||
- (widthMeasureMode == YGMeasureModeExactly && heightMeasureMode == YGMeasureModeExactly)) {
- const float marginAxisColumn = YGNodeMarginForAxis(node, YGFlexDirectionColumn, parentWidth);
- const float marginAxisRow = YGNodeMarginForAxis(node, YGFlexDirectionRow, parentWidth);
-
- node->layout.measuredDimensions[YGDimensionWidth] =
- YGNodeBoundAxis(node,
- YGFlexDirectionRow,
- YGFloatIsUndefined(availableWidth) ||
- (widthMeasureMode == YGMeasureModeAtMost && availableWidth < 0.0f)
- ? 0.0f
- : availableWidth - marginAxisRow,
- parentWidth,
- parentWidth);
-
- node->layout.measuredDimensions[YGDimensionHeight] =
- YGNodeBoundAxis(node,
- YGFlexDirectionColumn,
- YGFloatIsUndefined(availableHeight) ||
- (heightMeasureMode == YGMeasureModeAtMost && availableHeight < 0.0f)
- ? 0.0f
- : availableHeight - marginAxisColumn,
- parentHeight,
- parentWidth);
-
- return true;
- }
-
- return false;
-}
-
-static void YGZeroOutLayoutRecursivly(const YGNodeRef node) {
- memset(&(node->layout), 0, sizeof(YGLayout));
- node->hasNewLayout = true;
- YGCloneChildrenIfNeeded(node);
- const uint32_t childCount = YGNodeGetChildCount(node);
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef child = node->children[i];
- YGZeroOutLayoutRecursivly(child);
- }
-}
-
-//
-// This is the main routine that implements a subset of the flexbox layout
-// algorithm
-// described in the W3C YG documentation: https://www.w3.org/TR/YG3-flexbox/.
-//
-// Limitations of this algorithm, compared to the full standard:
-// * Display property is always assumed to be 'flex' except for Text nodes,
-// which
-// are assumed to be 'inline-flex'.
-// * The 'zIndex' property (or any form of z ordering) is not supported. Nodes
-// are
-// stacked in document order.
-// * The 'order' property is not supported. The order of flex items is always
-// defined
-// by document order.
-// * The 'visibility' property is always assumed to be 'visible'. Values of
-// 'collapse'
-// and 'hidden' are not supported.
-// * There is no support for forced breaks.
-// * It does not support vertical inline directions (top-to-bottom or
-// bottom-to-top text).
-//
-// Deviations from standard:
-// * Section 4.5 of the spec indicates that all flex items have a default
-// minimum
-// main size. For text blocks, for example, this is the width of the widest
-// word.
-// Calculating the minimum width is expensive, so we forego it and assume a
-// default
-// minimum main size of 0.
-// * Min/Max sizes in the main axis are not honored when resolving flexible
-// lengths.
-// * The spec indicates that the default value for 'flexDirection' is 'row',
-// but
-// the algorithm below assumes a default of 'column'.
-//
-// Input parameters:
-// - node: current node to be sized and layed out
-// - availableWidth & availableHeight: available size to be used for sizing
-// the node
-// or YGUndefined if the size is not available; interpretation depends on
-// layout
-// flags
-// - parentDirection: the inline (text) direction within the parent
-// (left-to-right or
-// right-to-left)
-// - widthMeasureMode: indicates the sizing rules for the width (see below
-// for explanation)
-// - heightMeasureMode: indicates the sizing rules for the height (see below
-// for explanation)
-// - performLayout: specifies whether the caller is interested in just the
-// dimensions
-// of the node or it requires the entire node and its subtree to be layed
-// out
-// (with final positions)
-//
-// Details:
-// This routine is called recursively to lay out subtrees of flexbox
-// elements. It uses the
-// information in node.style, which is treated as a read-only input. It is
-// responsible for
-// setting the layout.direction and layout.measuredDimensions fields for the
-// input node as well
-// as the layout.position and layout.lineIndex fields for its child nodes.
-// The
-// layout.measuredDimensions field includes any border or padding for the
-// node but does
-// not include margins.
-//
-// The spec describes four different layout modes: "fill available", "max
-// content", "min
-// content",
-// and "fit content". Of these, we don't use "min content" because we don't
-// support default
-// minimum main sizes (see above for details). Each of our measure modes maps
-// to a layout mode
-// from the spec (https://www.w3.org/TR/YG3-sizing/#terms):
-// - YGMeasureModeUndefined: max content
-// - YGMeasureModeExactly: fill available
-// - YGMeasureModeAtMost: fit content
-//
-// When calling YGNodelayoutImpl and YGLayoutNodeInternal, if the caller passes
-// an available size of
-// undefined then it must also pass a measure mode of YGMeasureModeUndefined
-// in that dimension.
-//
-static void YGNodelayoutImpl(const YGNodeRef node,
- const float availableWidth,
- const float availableHeight,
- const YGDirection parentDirection,
- const YGMeasureMode widthMeasureMode,
- const YGMeasureMode heightMeasureMode,
- const float parentWidth,
- const float parentHeight,
- const bool performLayout,
- const YGConfigRef config) {
- YGAssertWithNode(node,
- YGFloatIsUndefined(availableWidth) ? widthMeasureMode == YGMeasureModeUndefined
- : true,
- "availableWidth is indefinite so widthMeasureMode must be "
- "YGMeasureModeUndefined");
- YGAssertWithNode(node,
- YGFloatIsUndefined(availableHeight) ? heightMeasureMode == YGMeasureModeUndefined
- : true,
- "availableHeight is indefinite so heightMeasureMode must be "
- "YGMeasureModeUndefined");
-
- // Set the resolved resolution in the node's layout.
- const YGDirection direction = YGNodeResolveDirection(node, parentDirection);
- node->layout.direction = direction;
-
- const YGFlexDirection flexRowDirection = YGResolveFlexDirection(YGFlexDirectionRow, direction);
- const YGFlexDirection flexColumnDirection =
- YGResolveFlexDirection(YGFlexDirectionColumn, direction);
-
- node->layout.margin[YGEdgeStart] = YGNodeLeadingMargin(node, flexRowDirection, parentWidth);
- node->layout.margin[YGEdgeEnd] = YGNodeTrailingMargin(node, flexRowDirection, parentWidth);
- node->layout.margin[YGEdgeTop] = YGNodeLeadingMargin(node, flexColumnDirection, parentWidth);
- node->layout.margin[YGEdgeBottom] = YGNodeTrailingMargin(node, flexColumnDirection, parentWidth);
-
- node->layout.border[YGEdgeStart] = YGNodeLeadingBorder(node, flexRowDirection);
- node->layout.border[YGEdgeEnd] = YGNodeTrailingBorder(node, flexRowDirection);
- node->layout.border[YGEdgeTop] = YGNodeLeadingBorder(node, flexColumnDirection);
- node->layout.border[YGEdgeBottom] = YGNodeTrailingBorder(node, flexColumnDirection);
-
- node->layout.padding[YGEdgeStart] = YGNodeLeadingPadding(node, flexRowDirection, parentWidth);
- node->layout.padding[YGEdgeEnd] = YGNodeTrailingPadding(node, flexRowDirection, parentWidth);
- node->layout.padding[YGEdgeTop] = YGNodeLeadingPadding(node, flexColumnDirection, parentWidth);
- node->layout.padding[YGEdgeBottom] =
- YGNodeTrailingPadding(node, flexColumnDirection, parentWidth);
-
- if (node->measure) {
- YGNodeWithMeasureFuncSetMeasuredDimensions(node,
- availableWidth,
- availableHeight,
- widthMeasureMode,
- heightMeasureMode,
- parentWidth,
- parentHeight);
- return;
- }
-
- const uint32_t childCount = node->children.size();
- if (childCount == 0) {
- YGNodeEmptyContainerSetMeasuredDimensions(node,
- availableWidth,
- availableHeight,
- widthMeasureMode,
- heightMeasureMode,
- parentWidth,
- parentHeight);
- return;
- }
-
- // If we're not being asked to perform a full layout we can skip the algorithm if we already know
- // the size
- if (!performLayout && YGNodeFixedSizeSetMeasuredDimensions(node,
- availableWidth,
- availableHeight,
- widthMeasureMode,
- heightMeasureMode,
- parentWidth,
- parentHeight)) {
- return;
- }
-
- // At this point we know we're going to perform work. Ensure that each child has a mutable copy.
- YGCloneChildrenIfNeeded(node);
-
- // Reset layout flags, as they could have changed.
- node->layout.hadOverflow = false;
-
- // STEP 1: CALCULATE VALUES FOR REMAINDER OF ALGORITHM
- const YGFlexDirection mainAxis = YGResolveFlexDirection(node->style.flexDirection, direction);
- const YGFlexDirection crossAxis = YGFlexDirectionCross(mainAxis, direction);
- const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
- const YGJustify justifyContent = node->style.justifyContent;
- const bool isNodeFlexWrap = node->style.flexWrap != YGWrapNoWrap;
-
- const float mainAxisParentSize = isMainAxisRow ? parentWidth : parentHeight;
- const float crossAxisParentSize = isMainAxisRow ? parentHeight : parentWidth;
-
- YGNodeRef firstAbsoluteChild = nullptr;
- YGNodeRef currentAbsoluteChild = nullptr;
-
- const float leadingPaddingAndBorderMain =
- YGNodeLeadingPaddingAndBorder(node, mainAxis, parentWidth);
- const float trailingPaddingAndBorderMain =
- YGNodeTrailingPaddingAndBorder(node, mainAxis, parentWidth);
- const float leadingPaddingAndBorderCross =
- YGNodeLeadingPaddingAndBorder(node, crossAxis, parentWidth);
- const float paddingAndBorderAxisMain = YGNodePaddingAndBorderForAxis(node, mainAxis, parentWidth);
- const float paddingAndBorderAxisCross =
- YGNodePaddingAndBorderForAxis(node, crossAxis, parentWidth);
-
- YGMeasureMode measureModeMainDim = isMainAxisRow ? widthMeasureMode : heightMeasureMode;
- YGMeasureMode measureModeCrossDim = isMainAxisRow ? heightMeasureMode : widthMeasureMode;
-
- const float paddingAndBorderAxisRow =
- isMainAxisRow ? paddingAndBorderAxisMain : paddingAndBorderAxisCross;
- const float paddingAndBorderAxisColumn =
- isMainAxisRow ? paddingAndBorderAxisCross : paddingAndBorderAxisMain;
-
- const float marginAxisRow = YGNodeMarginForAxis(node, YGFlexDirectionRow, parentWidth);
- const float marginAxisColumn = YGNodeMarginForAxis(node, YGFlexDirectionColumn, parentWidth);
-
- // STEP 2: DETERMINE AVAILABLE SIZE IN MAIN AND CROSS DIRECTIONS
- const float minInnerWidth =
- YGResolveValue(&node->style.minDimensions[YGDimensionWidth], parentWidth) -
- paddingAndBorderAxisRow;
- const float maxInnerWidth =
- YGResolveValue(&node->style.maxDimensions[YGDimensionWidth], parentWidth) -
- paddingAndBorderAxisRow;
- const float minInnerHeight =
- YGResolveValue(&node->style.minDimensions[YGDimensionHeight], parentHeight) -
- paddingAndBorderAxisColumn;
- const float maxInnerHeight =
- YGResolveValue(&node->style.maxDimensions[YGDimensionHeight], parentHeight) -
- paddingAndBorderAxisColumn;
- const float minInnerMainDim = isMainAxisRow ? minInnerWidth : minInnerHeight;
- const float maxInnerMainDim = isMainAxisRow ? maxInnerWidth : maxInnerHeight;
-
- // Max dimension overrides predefined dimension value; Min dimension in turn overrides both of the
- // above
- float availableInnerWidth = availableWidth - marginAxisRow - paddingAndBorderAxisRow;
- if (!YGFloatIsUndefined(availableInnerWidth)) {
- // We want to make sure our available width does not violate min and max constraints
- availableInnerWidth = fmaxf(fminf(availableInnerWidth, maxInnerWidth), minInnerWidth);
- }
-
- float availableInnerHeight = availableHeight - marginAxisColumn - paddingAndBorderAxisColumn;
- if (!YGFloatIsUndefined(availableInnerHeight)) {
- // We want to make sure our available height does not violate min and max constraints
- availableInnerHeight = fmaxf(fminf(availableInnerHeight, maxInnerHeight), minInnerHeight);
- }
-
- float availableInnerMainDim = isMainAxisRow ? availableInnerWidth : availableInnerHeight;
- const float availableInnerCrossDim = isMainAxisRow ? availableInnerHeight : availableInnerWidth;
-
- // If there is only one child with flexGrow + flexShrink it means we can set the
- // computedFlexBasis to 0 instead of measuring and shrinking / flexing the child to exactly
- // match the remaining space
- YGNodeRef singleFlexChild = nullptr;
- if (measureModeMainDim == YGMeasureModeExactly) {
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef child = YGNodeGetChild(node, i);
- if (singleFlexChild) {
- if (YGNodeIsFlex(child)) {
- // There is already a flexible child, abort.
- singleFlexChild = nullptr;
- break;
- }
- } else if (YGResolveFlexGrow(child) > 0.0f && YGNodeResolveFlexShrink(child) > 0.0f) {
- singleFlexChild = child;
- }
- }
- }
-
- float totalOuterFlexBasis = 0;
-
- // STEP 3: DETERMINE FLEX BASIS FOR EACH ITEM
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef child = node->children[i];
- if (child->style.display == YGDisplayNone) {
- YGZeroOutLayoutRecursivly(child);
- child->hasNewLayout = true;
- child->isDirty = false;
- continue;
- }
- YGResolveDimensions(child);
- if (performLayout) {
- // Set the initial position (relative to the parent).
- const YGDirection childDirection = YGNodeResolveDirection(child, direction);
- YGNodeSetPosition(child,
- childDirection,
- availableInnerMainDim,
- availableInnerCrossDim,
- availableInnerWidth);
- }
-
- // Absolute-positioned children don't participate in flex layout. Add them
- // to a list that we can process later.
- if (child->style.positionType == YGPositionTypeAbsolute) {
- // Store a private linked list of absolutely positioned children
- // so that we can efficiently traverse them later.
- if (firstAbsoluteChild == nullptr) {
- firstAbsoluteChild = child;
- }
- if (currentAbsoluteChild != nullptr) {
- currentAbsoluteChild->nextChild = child;
- }
- currentAbsoluteChild = child;
- child->nextChild = nullptr;
- } else {
- if (child == singleFlexChild) {
- child->layout.computedFlexBasisGeneration = gCurrentGenerationCount;
- child->layout.computedFlexBasis = 0;
- } else {
- YGNodeComputeFlexBasisForChild(node,
- child,
- availableInnerWidth,
- widthMeasureMode,
- availableInnerHeight,
- availableInnerWidth,
- availableInnerHeight,
- heightMeasureMode,
- direction,
- config);
- }
- }
-
- totalOuterFlexBasis +=
- child->layout.computedFlexBasis + YGNodeMarginForAxis(child, mainAxis, availableInnerWidth);
- ;
- }
-
- const bool flexBasisOverflows = measureModeMainDim == YGMeasureModeUndefined
- ? false
- : totalOuterFlexBasis > availableInnerMainDim;
- if (isNodeFlexWrap && flexBasisOverflows && measureModeMainDim == YGMeasureModeAtMost) {
- measureModeMainDim = YGMeasureModeExactly;
- }
-
- // STEP 4: COLLECT FLEX ITEMS INTO FLEX LINES
-
- // Indexes of children that represent the first and last items in the line.
- uint32_t startOfLineIndex = 0;
- uint32_t endOfLineIndex = 0;
-
- // Number of lines.
- uint32_t lineCount = 0;
-
- // Accumulated cross dimensions of all lines so far.
- float totalLineCrossDim = 0;
-
- // Max main dimension of all the lines.
- float maxLineMainDim = 0;
-
- for (; endOfLineIndex < childCount; lineCount++, startOfLineIndex = endOfLineIndex) {
- // Number of items on the currently line. May be different than the
- // difference
- // between start and end indicates because we skip over absolute-positioned
- // items.
- uint32_t itemsOnLine = 0;
-
- // sizeConsumedOnCurrentLine is accumulation of the dimensions and margin
- // of all the children on the current line. This will be used in order to
- // either set the dimensions of the node if none already exist or to compute
- // the remaining space left for the flexible children.
- float sizeConsumedOnCurrentLine = 0;
- float sizeConsumedOnCurrentLineIncludingMinConstraint = 0;
-
- float totalFlexGrowFactors = 0;
- float totalFlexShrinkScaledFactors = 0;
-
- // Maintain a linked list of the child nodes that can shrink and/or grow.
- YGNodeRef firstRelativeChild = nullptr;
- YGNodeRef currentRelativeChild = nullptr;
-
- // Add items to the current line until it's full or we run out of items.
- for (uint32_t i = startOfLineIndex; i < childCount; i++, endOfLineIndex++) {
- const YGNodeRef child = node->children[i];
- if (child->style.display == YGDisplayNone) {
- continue;
- }
- child->lineIndex = lineCount;
-
- if (child->style.positionType != YGPositionTypeAbsolute) {
- const float childMarginMainAxis = YGNodeMarginForAxis(child, mainAxis, availableInnerWidth);
- const float flexBasisWithMaxConstraints =
- fminf(YGResolveValue(&child->style.maxDimensions[dim[mainAxis]], mainAxisParentSize),
- child->layout.computedFlexBasis);
- const float flexBasisWithMinAndMaxConstraints =
- fmaxf(YGResolveValue(&child->style.minDimensions[dim[mainAxis]], mainAxisParentSize),
- flexBasisWithMaxConstraints);
-
- // If this is a multi-line flow and this item pushes us over the
- // available size, we've
- // hit the end of the current line. Break out of the loop and lay out
- // the current line.
- if (sizeConsumedOnCurrentLineIncludingMinConstraint + flexBasisWithMinAndMaxConstraints +
- childMarginMainAxis >
- availableInnerMainDim &&
- isNodeFlexWrap && itemsOnLine > 0) {
- break;
- }
-
- sizeConsumedOnCurrentLineIncludingMinConstraint +=
- flexBasisWithMinAndMaxConstraints + childMarginMainAxis;
- sizeConsumedOnCurrentLine += flexBasisWithMinAndMaxConstraints + childMarginMainAxis;
- itemsOnLine++;
-
- if (YGNodeIsFlex(child)) {
- totalFlexGrowFactors += YGResolveFlexGrow(child);
-
- // Unlike the grow factor, the shrink factor is scaled relative to the child dimension.
- totalFlexShrinkScaledFactors +=
- -YGNodeResolveFlexShrink(child) * child->layout.computedFlexBasis;
- }
-
- // Store a private linked list of children that need to be layed out.
- if (firstRelativeChild == nullptr) {
- firstRelativeChild = child;
- }
- if (currentRelativeChild != nullptr) {
- currentRelativeChild->nextChild = child;
- }
- currentRelativeChild = child;
- child->nextChild = nullptr;
- }
- }
-
- // The total flex factor needs to be floored to 1.
- if (totalFlexGrowFactors > 0 && totalFlexGrowFactors < 1) {
- totalFlexGrowFactors = 1;
- }
-
- // The total flex shrink factor needs to be floored to 1.
- if (totalFlexShrinkScaledFactors > 0 && totalFlexShrinkScaledFactors < 1) {
- totalFlexShrinkScaledFactors = 1;
- }
-
- // If we don't need to measure the cross axis, we can skip the entire flex
- // step.
- const bool canSkipFlex = !performLayout && measureModeCrossDim == YGMeasureModeExactly;
-
- // In order to position the elements in the main axis, we have two
- // controls. The space between the beginning and the first element
- // and the space between each two elements.
- float leadingMainDim = 0;
- float betweenMainDim = 0;
-
- // STEP 5: RESOLVING FLEXIBLE LENGTHS ON MAIN AXIS
- // Calculate the remaining available space that needs to be allocated.
- // If the main dimension size isn't known, it is computed based on
- // the line length, so there's no more space left to distribute.
-
- bool sizeBasedOnContent = false;
- // If we don't measure with exact main dimension we want to ensure we don't violate min and max
- if (measureModeMainDim != YGMeasureModeExactly) {
- if (!YGFloatIsUndefined(minInnerMainDim) && sizeConsumedOnCurrentLine < minInnerMainDim) {
- availableInnerMainDim = minInnerMainDim;
- } else if (!YGFloatIsUndefined(maxInnerMainDim) &&
- sizeConsumedOnCurrentLine > maxInnerMainDim) {
- availableInnerMainDim = maxInnerMainDim;
- } else {
- if (!node->config->useLegacyStretchBehaviour &&
- (totalFlexGrowFactors == 0 || YGResolveFlexGrow(node) == 0)) {
- // If we don't have any children to flex or we can't flex the node itself,
- // space we've used is all space we need. Root node also should be shrunk to minimum
- availableInnerMainDim = sizeConsumedOnCurrentLine;
- }
- sizeBasedOnContent = !node->config->useLegacyStretchBehaviour;
- }
- }
-
- float remainingFreeSpace = 0;
- if (!sizeBasedOnContent && !YGFloatIsUndefined(availableInnerMainDim)) {
- remainingFreeSpace = availableInnerMainDim - sizeConsumedOnCurrentLine;
- } else if (sizeConsumedOnCurrentLine < 0) {
- // availableInnerMainDim is indefinite which means the node is being sized based on its
- // content.
- // sizeConsumedOnCurrentLine is negative which means the node will allocate 0 points for
- // its content. Consequently, remainingFreeSpace is 0 - sizeConsumedOnCurrentLine.
- remainingFreeSpace = -sizeConsumedOnCurrentLine;
- }
-
- const float originalRemainingFreeSpace = remainingFreeSpace;
- float deltaFreeSpace = 0;
-
- if (!canSkipFlex) {
- float childFlexBasis;
- float flexShrinkScaledFactor;
- float flexGrowFactor;
- float baseMainSize;
- float boundMainSize;
-
- // Do two passes over the flex items to figure out how to distribute the
- // remaining space.
- // The first pass finds the items whose min/max constraints trigger,
- // freezes them at those
- // sizes, and excludes those sizes from the remaining space. The second
- // pass sets the size
- // of each flexible item. It distributes the remaining space amongst the
- // items whose min/max
- // constraints didn't trigger in pass 1. For the other items, it sets
- // their sizes by forcing
- // their min/max constraints to trigger again.
- //
- // This two pass approach for resolving min/max constraints deviates from
- // the spec. The
- // spec (https://www.w3.org/TR/YG-flexbox-1/#resolve-flexible-lengths)
- // describes a process
- // that needs to be repeated a variable number of times. The algorithm
- // implemented here
- // won't handle all cases but it was simpler to implement and it mitigates
- // performance
- // concerns because we know exactly how many passes it'll do.
-
- // First pass: detect the flex items whose min/max constraints trigger
- float deltaFlexShrinkScaledFactors = 0;
- float deltaFlexGrowFactors = 0;
- currentRelativeChild = firstRelativeChild;
- while (currentRelativeChild != nullptr) {
- childFlexBasis =
- fminf(YGResolveValue(&currentRelativeChild->style.maxDimensions[dim[mainAxis]],
- mainAxisParentSize),
- fmaxf(YGResolveValue(&currentRelativeChild->style.minDimensions[dim[mainAxis]],
- mainAxisParentSize),
- currentRelativeChild->layout.computedFlexBasis));
-
- if (remainingFreeSpace < 0) {
- flexShrinkScaledFactor = -YGNodeResolveFlexShrink(currentRelativeChild) * childFlexBasis;
-
- // Is this child able to shrink?
- if (flexShrinkScaledFactor != 0) {
- baseMainSize =
- childFlexBasis +
- remainingFreeSpace / totalFlexShrinkScaledFactors * flexShrinkScaledFactor;
- boundMainSize = YGNodeBoundAxis(currentRelativeChild,
- mainAxis,
- baseMainSize,
- availableInnerMainDim,
- availableInnerWidth);
- if (baseMainSize != boundMainSize) {
- // By excluding this item's size and flex factor from remaining,
- // this item's
- // min/max constraints should also trigger in the second pass
- // resulting in the
- // item's size calculation being identical in the first and second
- // passes.
- deltaFreeSpace -= boundMainSize - childFlexBasis;
- deltaFlexShrinkScaledFactors -= flexShrinkScaledFactor;
- }
- }
- } else if (remainingFreeSpace > 0) {
- flexGrowFactor = YGResolveFlexGrow(currentRelativeChild);
-
- // Is this child able to grow?
- if (flexGrowFactor != 0) {
- baseMainSize =
- childFlexBasis + remainingFreeSpace / totalFlexGrowFactors * flexGrowFactor;
- boundMainSize = YGNodeBoundAxis(currentRelativeChild,
- mainAxis,
- baseMainSize,
- availableInnerMainDim,
- availableInnerWidth);
-
- if (baseMainSize != boundMainSize) {
- // By excluding this item's size and flex factor from remaining,
- // this item's
- // min/max constraints should also trigger in the second pass
- // resulting in the
- // item's size calculation being identical in the first and second
- // passes.
- deltaFreeSpace -= boundMainSize - childFlexBasis;
- deltaFlexGrowFactors -= flexGrowFactor;
- }
- }
- }
-
- currentRelativeChild = currentRelativeChild->nextChild;
- }
-
- totalFlexShrinkScaledFactors += deltaFlexShrinkScaledFactors;
- totalFlexGrowFactors += deltaFlexGrowFactors;
- remainingFreeSpace += deltaFreeSpace;
-
- // Second pass: resolve the sizes of the flexible items
- deltaFreeSpace = 0;
- currentRelativeChild = firstRelativeChild;
- while (currentRelativeChild != nullptr) {
- childFlexBasis =
- fminf(YGResolveValue(&currentRelativeChild->style.maxDimensions[dim[mainAxis]],
- mainAxisParentSize),
- fmaxf(YGResolveValue(&currentRelativeChild->style.minDimensions[dim[mainAxis]],
- mainAxisParentSize),
- currentRelativeChild->layout.computedFlexBasis));
- float updatedMainSize = childFlexBasis;
-
- if (remainingFreeSpace < 0) {
- flexShrinkScaledFactor = -YGNodeResolveFlexShrink(currentRelativeChild) * childFlexBasis;
- // Is this child able to shrink?
- if (flexShrinkScaledFactor != 0) {
- float childSize;
-
- if (totalFlexShrinkScaledFactors == 0) {
- childSize = childFlexBasis + flexShrinkScaledFactor;
- } else {
- childSize =
- childFlexBasis +
- (remainingFreeSpace / totalFlexShrinkScaledFactors) * flexShrinkScaledFactor;
- }
-
- updatedMainSize = YGNodeBoundAxis(currentRelativeChild,
- mainAxis,
- childSize,
- availableInnerMainDim,
- availableInnerWidth);
- }
- } else if (remainingFreeSpace > 0) {
- flexGrowFactor = YGResolveFlexGrow(currentRelativeChild);
-
- // Is this child able to grow?
- if (flexGrowFactor != 0) {
- updatedMainSize =
- YGNodeBoundAxis(currentRelativeChild,
- mainAxis,
- childFlexBasis +
- remainingFreeSpace / totalFlexGrowFactors * flexGrowFactor,
- availableInnerMainDim,
- availableInnerWidth);
- }
- }
-
- deltaFreeSpace -= updatedMainSize - childFlexBasis;
-
- const float marginMain =
- YGNodeMarginForAxis(currentRelativeChild, mainAxis, availableInnerWidth);
- const float marginCross =
- YGNodeMarginForAxis(currentRelativeChild, crossAxis, availableInnerWidth);
-
- float childCrossSize;
- float childMainSize = updatedMainSize + marginMain;
- YGMeasureMode childCrossMeasureMode;
- YGMeasureMode childMainMeasureMode = YGMeasureModeExactly;
-
- if (!YGFloatIsUndefined(currentRelativeChild->style.aspectRatio)) {
- childCrossSize =
- isMainAxisRow
- ? (childMainSize - marginMain) / currentRelativeChild->style.aspectRatio
- : (childMainSize - marginMain) * currentRelativeChild->style.aspectRatio;
- childCrossMeasureMode = YGMeasureModeExactly;
-
- childCrossSize += marginCross;
- } else if (!YGFloatIsUndefined(availableInnerCrossDim) &&
- !YGNodeIsStyleDimDefined(currentRelativeChild,
- crossAxis,
- availableInnerCrossDim) &&
- measureModeCrossDim == YGMeasureModeExactly &&
- !(isNodeFlexWrap && flexBasisOverflows) &&
- YGNodeAlignItem(node, currentRelativeChild) == YGAlignStretch &&
- YGMarginLeadingValue(currentRelativeChild, crossAxis)->unit != YGUnitAuto &&
- YGMarginTrailingValue(currentRelativeChild, crossAxis)->unit != YGUnitAuto) {
- childCrossSize = availableInnerCrossDim;
- childCrossMeasureMode = YGMeasureModeExactly;
- } else if (!YGNodeIsStyleDimDefined(currentRelativeChild,
- crossAxis,
- availableInnerCrossDim)) {
- childCrossSize = availableInnerCrossDim;
- childCrossMeasureMode =
- YGFloatIsUndefined(childCrossSize) ? YGMeasureModeUndefined : YGMeasureModeAtMost;
- } else {
- childCrossSize = YGResolveValue(currentRelativeChild->resolvedDimensions[dim[crossAxis]],
- availableInnerCrossDim) +
- marginCross;
- const bool isLoosePercentageMeasurement =
- currentRelativeChild->resolvedDimensions[dim[crossAxis]]->unit == YGUnitPercent &&
- measureModeCrossDim != YGMeasureModeExactly;
- childCrossMeasureMode = YGFloatIsUndefined(childCrossSize) || isLoosePercentageMeasurement
- ? YGMeasureModeUndefined
- : YGMeasureModeExactly;
- }
-
- YGConstrainMaxSizeForMode(currentRelativeChild,
- mainAxis,
- availableInnerMainDim,
- availableInnerWidth,
- &childMainMeasureMode,
- &childMainSize);
- YGConstrainMaxSizeForMode(currentRelativeChild,
- crossAxis,
- availableInnerCrossDim,
- availableInnerWidth,
- &childCrossMeasureMode,
- &childCrossSize);
-
- const bool requiresStretchLayout =
- !YGNodeIsStyleDimDefined(currentRelativeChild, crossAxis, availableInnerCrossDim) &&
- YGNodeAlignItem(node, currentRelativeChild) == YGAlignStretch &&
- YGMarginLeadingValue(currentRelativeChild, crossAxis)->unit != YGUnitAuto &&
- YGMarginTrailingValue(currentRelativeChild, crossAxis)->unit != YGUnitAuto;
-
- const float childWidth = isMainAxisRow ? childMainSize : childCrossSize;
- const float childHeight = !isMainAxisRow ? childMainSize : childCrossSize;
-
- const YGMeasureMode childWidthMeasureMode =
- isMainAxisRow ? childMainMeasureMode : childCrossMeasureMode;
- const YGMeasureMode childHeightMeasureMode =
- !isMainAxisRow ? childMainMeasureMode : childCrossMeasureMode;
-
- // Recursively call the layout algorithm for this child with the updated
- // main size.
- YGLayoutNodeInternal(currentRelativeChild,
- childWidth,
- childHeight,
- direction,
- childWidthMeasureMode,
- childHeightMeasureMode,
- availableInnerWidth,
- availableInnerHeight,
- performLayout && !requiresStretchLayout,
- "flex",
- config);
- node->layout.hadOverflow |= currentRelativeChild->layout.hadOverflow;
-
- currentRelativeChild = currentRelativeChild->nextChild;
- }
- }
-
- remainingFreeSpace = originalRemainingFreeSpace + deltaFreeSpace;
- node->layout.hadOverflow |= (remainingFreeSpace < 0);
-
- // STEP 6: MAIN-AXIS JUSTIFICATION & CROSS-AXIS SIZE DETERMINATION
-
- // At this point, all the children have their dimensions set in the main
- // axis.
- // Their dimensions are also set in the cross axis with the exception of
- // items
- // that are aligned "stretch". We need to compute these stretch values and
- // set the final positions.
-
- // If we are using "at most" rules in the main axis. Calculate the remaining space when
- // constraint by the min size defined for the main axis.
-
- if (measureModeMainDim == YGMeasureModeAtMost && remainingFreeSpace > 0) {
- if (node->style.minDimensions[dim[mainAxis]].unit != YGUnitUndefined &&
- YGResolveValue(&node->style.minDimensions[dim[mainAxis]], mainAxisParentSize) >= 0) {
- remainingFreeSpace =
- fmaxf(0,
- YGResolveValue(&node->style.minDimensions[dim[mainAxis]], mainAxisParentSize) -
- (availableInnerMainDim - remainingFreeSpace));
- } else {
- remainingFreeSpace = 0;
- }
- }
-
- int numberOfAutoMarginsOnCurrentLine = 0;
- for (uint32_t i = startOfLineIndex; i < endOfLineIndex; i++) {
- const YGNodeRef child = node->children[i];
- if (child->style.positionType == YGPositionTypeRelative) {
- if (YGMarginLeadingValue(child, mainAxis)->unit == YGUnitAuto) {
- numberOfAutoMarginsOnCurrentLine++;
- }
- if (YGMarginTrailingValue(child, mainAxis)->unit == YGUnitAuto) {
- numberOfAutoMarginsOnCurrentLine++;
- }
- }
- }
-
- if (numberOfAutoMarginsOnCurrentLine == 0) {
- switch (justifyContent) {
- case YGJustifyCenter:
- leadingMainDim = remainingFreeSpace / 2;
- break;
- case YGJustifyFlexEnd:
- leadingMainDim = remainingFreeSpace;
- break;
- case YGJustifySpaceBetween:
- if (itemsOnLine > 1) {
- betweenMainDim = fmaxf(remainingFreeSpace, 0) / (itemsOnLine - 1);
- } else {
- betweenMainDim = 0;
- }
- break;
- case YGJustifySpaceEvenly:
- // Space is distributed evenly across all elements
- betweenMainDim = remainingFreeSpace / (itemsOnLine + 1);
- leadingMainDim = betweenMainDim;
- break;
- case YGJustifySpaceAround:
- // Space on the edges is half of the space between elements
- betweenMainDim = remainingFreeSpace / itemsOnLine;
- leadingMainDim = betweenMainDim / 2;
- break;
- case YGJustifyFlexStart:
- break;
- }
- }
-
- float mainDim = leadingPaddingAndBorderMain + leadingMainDim;
- float crossDim = 0;
-
- for (uint32_t i = startOfLineIndex; i < endOfLineIndex; i++) {
- const YGNodeRef child = node->children[i];
- if (child->style.display == YGDisplayNone) {
- continue;
- }
- if (child->style.positionType == YGPositionTypeAbsolute &&
- YGNodeIsLeadingPosDefined(child, mainAxis)) {
- if (performLayout) {
- // In case the child is position absolute and has left/top being
- // defined, we override the position to whatever the user said
- // (and margin/border).
- child->layout.position[pos[mainAxis]] =
- YGNodeLeadingPosition(child, mainAxis, availableInnerMainDim) +
- YGNodeLeadingBorder(node, mainAxis) +
- YGNodeLeadingMargin(child, mainAxis, availableInnerWidth);
- }
- } else {
- // Now that we placed the element, we need to update the variables.
- // We need to do that only for relative elements. Absolute elements
- // do not take part in that phase.
- if (child->style.positionType == YGPositionTypeRelative) {
- if (YGMarginLeadingValue(child, mainAxis)->unit == YGUnitAuto) {
- mainDim += remainingFreeSpace / numberOfAutoMarginsOnCurrentLine;
- }
-
- if (performLayout) {
- child->layout.position[pos[mainAxis]] += mainDim;
- }
-
- if (YGMarginTrailingValue(child, mainAxis)->unit == YGUnitAuto) {
- mainDim += remainingFreeSpace / numberOfAutoMarginsOnCurrentLine;
- }
-
- if (canSkipFlex) {
- // If we skipped the flex step, then we can't rely on the
- // measuredDims because
- // they weren't computed. This means we can't call YGNodeDimWithMargin.
- mainDim += betweenMainDim + YGNodeMarginForAxis(child, mainAxis, availableInnerWidth) +
- child->layout.computedFlexBasis;
- crossDim = availableInnerCrossDim;
- } else {
- // The main dimension is the sum of all the elements dimension plus the spacing.
- mainDim += betweenMainDim + YGNodeDimWithMargin(child, mainAxis, availableInnerWidth);
-
- // The cross dimension is the max of the elements dimension since
- // there can only be one element in that cross dimension.
- crossDim = fmaxf(crossDim, YGNodeDimWithMargin(child, crossAxis, availableInnerWidth));
- }
- } else if (performLayout) {
- child->layout.position[pos[mainAxis]] +=
- YGNodeLeadingBorder(node, mainAxis) + leadingMainDim;
- }
- }
- }
-
- mainDim += trailingPaddingAndBorderMain;
-
- float containerCrossAxis = availableInnerCrossDim;
- if (measureModeCrossDim == YGMeasureModeUndefined ||
- measureModeCrossDim == YGMeasureModeAtMost) {
- // Compute the cross axis from the max cross dimension of the children.
- containerCrossAxis = YGNodeBoundAxis(node,
- crossAxis,
- crossDim + paddingAndBorderAxisCross,
- crossAxisParentSize,
- parentWidth) -
- paddingAndBorderAxisCross;
- }
-
- // If there's no flex wrap, the cross dimension is defined by the container.
- if (!isNodeFlexWrap && measureModeCrossDim == YGMeasureModeExactly) {
- crossDim = availableInnerCrossDim;
- }
-
- // Clamp to the min/max size specified on the container.
- crossDim = YGNodeBoundAxis(node,
- crossAxis,
- crossDim + paddingAndBorderAxisCross,
- crossAxisParentSize,
- parentWidth) -
- paddingAndBorderAxisCross;
-
- // STEP 7: CROSS-AXIS ALIGNMENT
- // We can skip child alignment if we're just measuring the container.
- if (performLayout) {
- for (uint32_t i = startOfLineIndex; i < endOfLineIndex; i++) {
- const YGNodeRef child = node->children[i];
- if (child->style.display == YGDisplayNone) {
- continue;
- }
- if (child->style.positionType == YGPositionTypeAbsolute) {
- // If the child is absolutely positioned and has a
- // top/left/bottom/right
- // set, override all the previously computed positions to set it
- // correctly.
- const bool isChildLeadingPosDefined = YGNodeIsLeadingPosDefined(child, crossAxis);
- if (isChildLeadingPosDefined) {
- child->layout.position[pos[crossAxis]] =
- YGNodeLeadingPosition(child, crossAxis, availableInnerCrossDim) +
- YGNodeLeadingBorder(node, crossAxis) +
- YGNodeLeadingMargin(child, crossAxis, availableInnerWidth);
- }
- // If leading position is not defined or calculations result in Nan, default to border + margin
- if (!isChildLeadingPosDefined || YGFloatIsUndefined(child->layout.position[pos[crossAxis]])) {
- child->layout.position[pos[crossAxis]] =
- YGNodeLeadingBorder(node, crossAxis) +
- YGNodeLeadingMargin(child, crossAxis, availableInnerWidth);
- }
- } else {
- float leadingCrossDim = leadingPaddingAndBorderCross;
-
- // For a relative children, we're either using alignItems (parent) or
- // alignSelf (child) in order to determine the position in the cross
- // axis
- const YGAlign alignItem = YGNodeAlignItem(node, child);
-
- // If the child uses align stretch, we need to lay it out one more
- // time, this time
- // forcing the cross-axis size to be the computed cross size for the
- // current line.
- if (alignItem == YGAlignStretch &&
- YGMarginLeadingValue(child, crossAxis)->unit != YGUnitAuto &&
- YGMarginTrailingValue(child, crossAxis)->unit != YGUnitAuto) {
- // If the child defines a definite size for its cross axis, there's
- // no need to stretch.
- if (!YGNodeIsStyleDimDefined(child, crossAxis, availableInnerCrossDim)) {
- float childMainSize = child->layout.measuredDimensions[dim[mainAxis]];
- float childCrossSize =
- !YGFloatIsUndefined(child->style.aspectRatio)
- ? ((YGNodeMarginForAxis(child, crossAxis, availableInnerWidth) +
- (isMainAxisRow ? childMainSize / child->style.aspectRatio
- : childMainSize * child->style.aspectRatio)))
- : crossDim;
-
- childMainSize += YGNodeMarginForAxis(child, mainAxis, availableInnerWidth);
-
- YGMeasureMode childMainMeasureMode = YGMeasureModeExactly;
- YGMeasureMode childCrossMeasureMode = YGMeasureModeExactly;
- YGConstrainMaxSizeForMode(child,
- mainAxis,
- availableInnerMainDim,
- availableInnerWidth,
- &childMainMeasureMode,
- &childMainSize);
- YGConstrainMaxSizeForMode(child,
- crossAxis,
- availableInnerCrossDim,
- availableInnerWidth,
- &childCrossMeasureMode,
- &childCrossSize);
-
- const float childWidth = isMainAxisRow ? childMainSize : childCrossSize;
- const float childHeight = !isMainAxisRow ? childMainSize : childCrossSize;
-
- const YGMeasureMode childWidthMeasureMode =
- YGFloatIsUndefined(childWidth) ? YGMeasureModeUndefined : YGMeasureModeExactly;
- const YGMeasureMode childHeightMeasureMode =
- YGFloatIsUndefined(childHeight) ? YGMeasureModeUndefined : YGMeasureModeExactly;
-
- YGLayoutNodeInternal(child,
- childWidth,
- childHeight,
- direction,
- childWidthMeasureMode,
- childHeightMeasureMode,
- availableInnerWidth,
- availableInnerHeight,
- true,
- "stretch",
- config);
- }
- } else {
- const float remainingCrossDim =
- containerCrossAxis - YGNodeDimWithMargin(child, crossAxis, availableInnerWidth);
-
- if (YGMarginLeadingValue(child, crossAxis)->unit == YGUnitAuto &&
- YGMarginTrailingValue(child, crossAxis)->unit == YGUnitAuto) {
- leadingCrossDim += fmaxf(0.0f, remainingCrossDim / 2);
- } else if (YGMarginTrailingValue(child, crossAxis)->unit == YGUnitAuto) {
- // No-Op
- } else if (YGMarginLeadingValue(child, crossAxis)->unit == YGUnitAuto) {
- leadingCrossDim += fmaxf(0.0f, remainingCrossDim);
- } else if (alignItem == YGAlignFlexStart) {
- // No-Op
- } else if (alignItem == YGAlignCenter) {
- leadingCrossDim += remainingCrossDim / 2;
- } else {
- leadingCrossDim += remainingCrossDim;
- }
- }
- // And we apply the position
- child->layout.position[pos[crossAxis]] += totalLineCrossDim + leadingCrossDim;
- }
- }
- }
-
- totalLineCrossDim += crossDim;
- maxLineMainDim = fmaxf(maxLineMainDim, mainDim);
- }
-
- // STEP 8: MULTI-LINE CONTENT ALIGNMENT
- if (performLayout && (lineCount > 1 || YGIsBaselineLayout(node)) &&
- !YGFloatIsUndefined(availableInnerCrossDim)) {
- const float remainingAlignContentDim = availableInnerCrossDim - totalLineCrossDim;
-
- float crossDimLead = 0;
- float currentLead = leadingPaddingAndBorderCross;
-
- switch (node->style.alignContent) {
- case YGAlignFlexEnd:
- currentLead += remainingAlignContentDim;
- break;
- case YGAlignCenter:
- currentLead += remainingAlignContentDim / 2;
- break;
- case YGAlignStretch:
- if (availableInnerCrossDim > totalLineCrossDim) {
- crossDimLead = remainingAlignContentDim / lineCount;
- }
- break;
- case YGAlignSpaceAround:
- if (availableInnerCrossDim > totalLineCrossDim) {
- currentLead += remainingAlignContentDim / (2 * lineCount);
- if (lineCount > 1) {
- crossDimLead = remainingAlignContentDim / lineCount;
- }
- } else {
- currentLead += remainingAlignContentDim / 2;
- }
- break;
- case YGAlignSpaceBetween:
- if (availableInnerCrossDim > totalLineCrossDim && lineCount > 1) {
- crossDimLead = remainingAlignContentDim / (lineCount - 1);
- }
- break;
- case YGAlignAuto:
- case YGAlignFlexStart:
- case YGAlignBaseline:
- break;
- }
-
- uint32_t endIndex = 0;
- for (uint32_t i = 0; i < lineCount; i++) {
- const uint32_t startIndex = endIndex;
- uint32_t ii;
-
- // compute the line's height and find the endIndex
- float lineHeight = 0;
- float maxAscentForCurrentLine = 0;
- float maxDescentForCurrentLine = 0;
- for (ii = startIndex; ii < childCount; ii++) {
- const YGNodeRef child = node->children[ii];
- if (child->style.display == YGDisplayNone) {
- continue;
- }
- if (child->style.positionType == YGPositionTypeRelative) {
- if (child->lineIndex != i) {
- break;
- }
- if (YGNodeIsLayoutDimDefined(child, crossAxis)) {
- lineHeight = fmaxf(lineHeight,
- child->layout.measuredDimensions[dim[crossAxis]] +
- YGNodeMarginForAxis(child, crossAxis, availableInnerWidth));
- }
- if (YGNodeAlignItem(node, child) == YGAlignBaseline) {
- const float ascent =
- YGBaseline(child) +
- YGNodeLeadingMargin(child, YGFlexDirectionColumn, availableInnerWidth);
- const float descent =
- child->layout.measuredDimensions[YGDimensionHeight] +
- YGNodeMarginForAxis(child, YGFlexDirectionColumn, availableInnerWidth) - ascent;
- maxAscentForCurrentLine = fmaxf(maxAscentForCurrentLine, ascent);
- maxDescentForCurrentLine = fmaxf(maxDescentForCurrentLine, descent);
- lineHeight = fmaxf(lineHeight, maxAscentForCurrentLine + maxDescentForCurrentLine);
- }
- }
- }
- endIndex = ii;
- lineHeight += crossDimLead;
-
- if (performLayout) {
- for (ii = startIndex; ii < endIndex; ii++) {
- const YGNodeRef child = node->children[ii];
- if (child->style.display == YGDisplayNone) {
- continue;
- }
- if (child->style.positionType == YGPositionTypeRelative) {
- switch (YGNodeAlignItem(node, child)) {
- case YGAlignFlexStart: {
- child->layout.position[pos[crossAxis]] =
- currentLead + YGNodeLeadingMargin(child, crossAxis, availableInnerWidth);
- break;
- }
- case YGAlignFlexEnd: {
- child->layout.position[pos[crossAxis]] =
- currentLead + lineHeight -
- YGNodeTrailingMargin(child, crossAxis, availableInnerWidth) -
- child->layout.measuredDimensions[dim[crossAxis]];
- break;
- }
- case YGAlignCenter: {
- float childHeight = child->layout.measuredDimensions[dim[crossAxis]];
- child->layout.position[pos[crossAxis]] =
- currentLead + (lineHeight - childHeight) / 2;
- break;
- }
- case YGAlignStretch: {
- child->layout.position[pos[crossAxis]] =
- currentLead + YGNodeLeadingMargin(child, crossAxis, availableInnerWidth);
-
- // Remeasure child with the line height as it as been only measured with the
- // parents height yet.
- if (!YGNodeIsStyleDimDefined(child, crossAxis, availableInnerCrossDim)) {
- const float childWidth =
- isMainAxisRow ? (child->layout.measuredDimensions[YGDimensionWidth] +
- YGNodeMarginForAxis(child, mainAxis, availableInnerWidth))
- : lineHeight;
-
- const float childHeight =
- !isMainAxisRow ? (child->layout.measuredDimensions[YGDimensionHeight] +
- YGNodeMarginForAxis(child, crossAxis, availableInnerWidth))
- : lineHeight;
-
- if (!(YGFloatsEqual(childWidth,
- child->layout.measuredDimensions[YGDimensionWidth]) &&
- YGFloatsEqual(childHeight,
- child->layout.measuredDimensions[YGDimensionHeight]))) {
- YGLayoutNodeInternal(child,
- childWidth,
- childHeight,
- direction,
- YGMeasureModeExactly,
- YGMeasureModeExactly,
- availableInnerWidth,
- availableInnerHeight,
- true,
- "multiline-stretch",
- config);
- }
- }
- break;
- }
- case YGAlignBaseline: {
- child->layout.position[YGEdgeTop] =
- currentLead + maxAscentForCurrentLine - YGBaseline(child) +
- YGNodeLeadingPosition(child, YGFlexDirectionColumn, availableInnerCrossDim);
- break;
- }
- case YGAlignAuto:
- case YGAlignSpaceBetween:
- case YGAlignSpaceAround:
- break;
- }
- }
- }
- }
-
- currentLead += lineHeight;
- }
- }
-
- // STEP 9: COMPUTING FINAL DIMENSIONS
- node->layout.measuredDimensions[YGDimensionWidth] = YGNodeBoundAxis(
- node, YGFlexDirectionRow, availableWidth - marginAxisRow, parentWidth, parentWidth);
- node->layout.measuredDimensions[YGDimensionHeight] = YGNodeBoundAxis(
- node, YGFlexDirectionColumn, availableHeight - marginAxisColumn, parentHeight, parentWidth);
-
- // If the user didn't specify a width or height for the node, set the
- // dimensions based on the children.
- if (measureModeMainDim == YGMeasureModeUndefined ||
- (node->style.overflow != YGOverflowScroll && measureModeMainDim == YGMeasureModeAtMost)) {
- // Clamp the size to the min/max size, if specified, and make sure it
- // doesn't go below the padding and border amount.
- node->layout.measuredDimensions[dim[mainAxis]] =
- YGNodeBoundAxis(node, mainAxis, maxLineMainDim, mainAxisParentSize, parentWidth);
- } else if (measureModeMainDim == YGMeasureModeAtMost &&
- node->style.overflow == YGOverflowScroll) {
- node->layout.measuredDimensions[dim[mainAxis]] = fmaxf(
- fminf(availableInnerMainDim + paddingAndBorderAxisMain,
- YGNodeBoundAxisWithinMinAndMax(node, mainAxis, maxLineMainDim, mainAxisParentSize)),
- paddingAndBorderAxisMain);
- }
-
- if (measureModeCrossDim == YGMeasureModeUndefined ||
- (node->style.overflow != YGOverflowScroll && measureModeCrossDim == YGMeasureModeAtMost)) {
- // Clamp the size to the min/max size, if specified, and make sure it
- // doesn't go below the padding and border amount.
- node->layout.measuredDimensions[dim[crossAxis]] =
- YGNodeBoundAxis(node,
- crossAxis,
- totalLineCrossDim + paddingAndBorderAxisCross,
- crossAxisParentSize,
- parentWidth);
- } else if (measureModeCrossDim == YGMeasureModeAtMost &&
- node->style.overflow == YGOverflowScroll) {
- node->layout.measuredDimensions[dim[crossAxis]] =
- fmaxf(fminf(availableInnerCrossDim + paddingAndBorderAxisCross,
- YGNodeBoundAxisWithinMinAndMax(node,
- crossAxis,
- totalLineCrossDim + paddingAndBorderAxisCross,
- crossAxisParentSize)),
- paddingAndBorderAxisCross);
- }
-
- // As we only wrapped in normal direction yet, we need to reverse the positions on wrap-reverse.
- if (performLayout && node->style.flexWrap == YGWrapWrapReverse) {
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef child = YGNodeGetChild(node, i);
- if (child->style.positionType == YGPositionTypeRelative) {
- child->layout.position[pos[crossAxis]] = node->layout.measuredDimensions[dim[crossAxis]] -
- child->layout.position[pos[crossAxis]] -
- child->layout.measuredDimensions[dim[crossAxis]];
- }
- }
- }
-
- if (performLayout) {
- // STEP 10: SIZING AND POSITIONING ABSOLUTE CHILDREN
- for (currentAbsoluteChild = firstAbsoluteChild;
- currentAbsoluteChild != nullptr;
- currentAbsoluteChild = currentAbsoluteChild->nextChild) {
- YGNodeAbsoluteLayoutChild(node,
- currentAbsoluteChild,
- availableInnerWidth,
- isMainAxisRow ? measureModeMainDim : measureModeCrossDim,
- availableInnerHeight,
- direction,
- config);
- }
-
- // STEP 11: SETTING TRAILING POSITIONS FOR CHILDREN
- const bool needsMainTrailingPos =
- mainAxis == YGFlexDirectionRowReverse || mainAxis == YGFlexDirectionColumnReverse;
- const bool needsCrossTrailingPos =
- crossAxis == YGFlexDirectionRowReverse || crossAxis == YGFlexDirectionColumnReverse;
-
- // Set trailing position if necessary.
- if (needsMainTrailingPos || needsCrossTrailingPos) {
- for (uint32_t i = 0; i < childCount; i++) {
- const YGNodeRef child = node->children[i];
- if (child->style.display == YGDisplayNone) {
- continue;
- }
- if (needsMainTrailingPos) {
- YGNodeSetChildTrailingPosition(node, child, mainAxis);
- }
-
- if (needsCrossTrailingPos) {
- YGNodeSetChildTrailingPosition(node, child, crossAxis);
- }
- }
- }
- }
-}
-
-uint32_t gDepth = 0;
-bool gPrintTree = false;
-bool gPrintChanges = false;
-bool gPrintSkips = false;
-
-static const char *spacer = " ";
-
-static const char *YGSpacer(const unsigned long level) {
- const size_t spacerLen = strlen(spacer);
- if (level > spacerLen) {
- return &spacer[0];
- } else {
- return &spacer[spacerLen - level];
- }
-}
-
-static const char *YGMeasureModeName(const YGMeasureMode mode, const bool performLayout) {
- const char *kMeasureModeNames[YGMeasureModeCount] = {"UNDEFINED", "EXACTLY", "AT_MOST"};
- const char *kLayoutModeNames[YGMeasureModeCount] = {"LAY_UNDEFINED",
- "LAY_EXACTLY",
- "LAY_AT_"
- "MOST"};
-
- if (mode >= YGMeasureModeCount) {
- return "";
- }
-
- return performLayout ? kLayoutModeNames[mode] : kMeasureModeNames[mode];
-}
-
-static inline bool YGMeasureModeSizeIsExactAndMatchesOldMeasuredSize(YGMeasureMode sizeMode,
- float size,
- float lastComputedSize) {
- return sizeMode == YGMeasureModeExactly && YGFloatsEqual(size, lastComputedSize);
-}
-
-static inline bool YGMeasureModeOldSizeIsUnspecifiedAndStillFits(YGMeasureMode sizeMode,
- float size,
- YGMeasureMode lastSizeMode,
- float lastComputedSize) {
- return sizeMode == YGMeasureModeAtMost && lastSizeMode == YGMeasureModeUndefined &&
- (size >= lastComputedSize || YGFloatsEqual(size, lastComputedSize));
-}
-
-static inline bool YGMeasureModeNewMeasureSizeIsStricterAndStillValid(YGMeasureMode sizeMode,
- float size,
- YGMeasureMode lastSizeMode,
- float lastSize,
- float lastComputedSize) {
- return lastSizeMode == YGMeasureModeAtMost && sizeMode == YGMeasureModeAtMost &&
- lastSize > size && (lastComputedSize <= size || YGFloatsEqual(size, lastComputedSize));
-}
-
-float YGRoundValueToPixelGrid(const float value,
- const float pointScaleFactor,
- const bool forceCeil,
- const bool forceFloor) {
- float scaledValue = value * pointScaleFactor;
- float fractial = fmodf(scaledValue, 1.0);
- if (YGFloatsEqual(fractial, 0)) {
- // First we check if the value is already rounded
- scaledValue = scaledValue - fractial;
- } else if (YGFloatsEqual(fractial, 1.0)) {
- scaledValue = scaledValue - fractial + 1.0;
- } else if (forceCeil) {
- // Next we check if we need to use forced rounding
- scaledValue = scaledValue - fractial + 1.0f;
- } else if (forceFloor) {
- scaledValue = scaledValue - fractial;
- } else {
- // Finally we just round the value
- scaledValue = scaledValue - fractial +
- (fractial > 0.5f || YGFloatsEqual(fractial, 0.5f) ? 1.0f : 0.0f);
- }
- return scaledValue / pointScaleFactor;
-}
-
-bool YGNodeCanUseCachedMeasurement(const YGMeasureMode widthMode,
- const float width,
- const YGMeasureMode heightMode,
- const float height,
- const YGMeasureMode lastWidthMode,
- const float lastWidth,
- const YGMeasureMode lastHeightMode,
- const float lastHeight,
- const float lastComputedWidth,
- const float lastComputedHeight,
- const float marginRow,
- const float marginColumn,
- const YGConfigRef config) {
- if (lastComputedHeight < 0 || lastComputedWidth < 0) {
- return false;
- }
- bool useRoundedComparison =
- config != nullptr && config->pointScaleFactor != 0;
- const float effectiveWidth =
- useRoundedComparison ? YGRoundValueToPixelGrid(width, config->pointScaleFactor, false, false)
- : width;
- const float effectiveHeight =
- useRoundedComparison ? YGRoundValueToPixelGrid(height, config->pointScaleFactor, false, false)
- : height;
- const float effectiveLastWidth =
- useRoundedComparison
- ? YGRoundValueToPixelGrid(lastWidth, config->pointScaleFactor, false, false)
- : lastWidth;
- const float effectiveLastHeight =
- useRoundedComparison
- ? YGRoundValueToPixelGrid(lastHeight, config->pointScaleFactor, false, false)
- : lastHeight;
-
- const bool hasSameWidthSpec =
- lastWidthMode == widthMode && YGFloatsEqual(effectiveLastWidth, effectiveWidth);
- const bool hasSameHeightSpec =
- lastHeightMode == heightMode && YGFloatsEqual(effectiveLastHeight, effectiveHeight);
-
- const bool widthIsCompatible =
- hasSameWidthSpec || YGMeasureModeSizeIsExactAndMatchesOldMeasuredSize(widthMode,
- width - marginRow,
- lastComputedWidth) ||
- YGMeasureModeOldSizeIsUnspecifiedAndStillFits(widthMode,
- width - marginRow,
- lastWidthMode,
- lastComputedWidth) ||
- YGMeasureModeNewMeasureSizeIsStricterAndStillValid(
- widthMode, width - marginRow, lastWidthMode, lastWidth, lastComputedWidth);
-
- const bool heightIsCompatible =
- hasSameHeightSpec || YGMeasureModeSizeIsExactAndMatchesOldMeasuredSize(heightMode,
- height - marginColumn,
- lastComputedHeight) ||
- YGMeasureModeOldSizeIsUnspecifiedAndStillFits(heightMode,
- height - marginColumn,
- lastHeightMode,
- lastComputedHeight) ||
- YGMeasureModeNewMeasureSizeIsStricterAndStillValid(
- heightMode, height - marginColumn, lastHeightMode, lastHeight, lastComputedHeight);
-
- return widthIsCompatible && heightIsCompatible;
-}
-
-//
-// This is a wrapper around the YGNodelayoutImpl function. It determines
-// whether the layout request is redundant and can be skipped.
-//
-// Parameters:
-// Input parameters are the same as YGNodelayoutImpl (see above)
-// Return parameter is true if layout was performed, false if skipped
-//
-bool YGLayoutNodeInternal(const YGNodeRef node,
- const float availableWidth,
- const float availableHeight,
- const YGDirection parentDirection,
- const YGMeasureMode widthMeasureMode,
- const YGMeasureMode heightMeasureMode,
- const float parentWidth,
- const float parentHeight,
- const bool performLayout,
- const char *reason,
- const YGConfigRef config) {
- YGLayout *layout = &node->layout;
-
- gDepth++;
-
- const bool needToVisitNode =
- (node->isDirty && layout->generationCount != gCurrentGenerationCount) ||
- layout->lastParentDirection != parentDirection;
-
- if (needToVisitNode) {
- // Invalidate the cached results.
- layout->nextCachedMeasurementsIndex = 0;
- layout->cachedLayout.widthMeasureMode = (YGMeasureMode) -1;
- layout->cachedLayout.heightMeasureMode = (YGMeasureMode) -1;
- layout->cachedLayout.computedWidth = -1;
- layout->cachedLayout.computedHeight = -1;
- }
-
- YGCachedMeasurement* cachedResults = nullptr;
-
- // Determine whether the results are already cached. We maintain a separate
- // cache for layouts and measurements. A layout operation modifies the
- // positions
- // and dimensions for nodes in the subtree. The algorithm assumes that each
- // node
- // gets layed out a maximum of one time per tree layout, but multiple
- // measurements
- // may be required to resolve all of the flex dimensions.
- // We handle nodes with measure functions specially here because they are the
- // most
- // expensive to measure, so it's worth avoiding redundant measurements if at
- // all possible.
- if (node->measure) {
- const float marginAxisRow = YGNodeMarginForAxis(node, YGFlexDirectionRow, parentWidth);
- const float marginAxisColumn = YGNodeMarginForAxis(node, YGFlexDirectionColumn, parentWidth);
-
- // First, try to use the layout cache.
- if (YGNodeCanUseCachedMeasurement(widthMeasureMode,
- availableWidth,
- heightMeasureMode,
- availableHeight,
- layout->cachedLayout.widthMeasureMode,
- layout->cachedLayout.availableWidth,
- layout->cachedLayout.heightMeasureMode,
- layout->cachedLayout.availableHeight,
- layout->cachedLayout.computedWidth,
- layout->cachedLayout.computedHeight,
- marginAxisRow,
- marginAxisColumn,
- config)) {
- cachedResults = &layout->cachedLayout;
- } else {
- // Try to use the measurement cache.
- for (uint32_t i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
- if (YGNodeCanUseCachedMeasurement(widthMeasureMode,
- availableWidth,
- heightMeasureMode,
- availableHeight,
- layout->cachedMeasurements[i].widthMeasureMode,
- layout->cachedMeasurements[i].availableWidth,
- layout->cachedMeasurements[i].heightMeasureMode,
- layout->cachedMeasurements[i].availableHeight,
- layout->cachedMeasurements[i].computedWidth,
- layout->cachedMeasurements[i].computedHeight,
- marginAxisRow,
- marginAxisColumn,
- config)) {
- cachedResults = &layout->cachedMeasurements[i];
- break;
- }
- }
- }
- } else if (performLayout) {
- if (YGFloatsEqual(layout->cachedLayout.availableWidth, availableWidth) &&
- YGFloatsEqual(layout->cachedLayout.availableHeight, availableHeight) &&
- layout->cachedLayout.widthMeasureMode == widthMeasureMode &&
- layout->cachedLayout.heightMeasureMode == heightMeasureMode) {
- cachedResults = &layout->cachedLayout;
- }
- } else {
- for (uint32_t i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
- if (YGFloatsEqual(layout->cachedMeasurements[i].availableWidth, availableWidth) &&
- YGFloatsEqual(layout->cachedMeasurements[i].availableHeight, availableHeight) &&
- layout->cachedMeasurements[i].widthMeasureMode == widthMeasureMode &&
- layout->cachedMeasurements[i].heightMeasureMode == heightMeasureMode) {
- cachedResults = &layout->cachedMeasurements[i];
- break;
- }
- }
- }
-
- if (!needToVisitNode && cachedResults != nullptr) {
- layout->measuredDimensions[YGDimensionWidth] = cachedResults->computedWidth;
- layout->measuredDimensions[YGDimensionHeight] = cachedResults->computedHeight;
-
- if (gPrintChanges && gPrintSkips) {
- YGLog(node, YGLogLevelVerbose, "%s%d.{[skipped] ", YGSpacer(gDepth), gDepth);
- if (node->print) {
- node->print(node);
- }
- YGLog(
- node,
- YGLogLevelVerbose,
- "wm: %s, hm: %s, aw: %f ah: %f => d: (%f, %f) %s\n",
- YGMeasureModeName(widthMeasureMode, performLayout),
- YGMeasureModeName(heightMeasureMode, performLayout),
- availableWidth,
- availableHeight,
- cachedResults->computedWidth,
- cachedResults->computedHeight,
- reason);
- }
- } else {
- if (gPrintChanges) {
- YGLog(
- node,
- YGLogLevelVerbose,
- "%s%d.{%s",
- YGSpacer(gDepth),
- gDepth,
- needToVisitNode ? "*" : "");
- if (node->print) {
- node->print(node);
- }
- YGLog(
- node,
- YGLogLevelVerbose,
- "wm: %s, hm: %s, aw: %f ah: %f %s\n",
- YGMeasureModeName(widthMeasureMode, performLayout),
- YGMeasureModeName(heightMeasureMode, performLayout),
- availableWidth,
- availableHeight,
- reason);
- }
-
- YGNodelayoutImpl(node,
- availableWidth,
- availableHeight,
- parentDirection,
- widthMeasureMode,
- heightMeasureMode,
- parentWidth,
- parentHeight,
- performLayout,
- config);
-
- if (gPrintChanges) {
- YGLog(
- node,
- YGLogLevelVerbose,
- "%s%d.}%s",
- YGSpacer(gDepth),
- gDepth,
- needToVisitNode ? "*" : "");
- if (node->print) {
- node->print(node);
- }
- YGLog(
- node,
- YGLogLevelVerbose,
- "wm: %s, hm: %s, d: (%f, %f) %s\n",
- YGMeasureModeName(widthMeasureMode, performLayout),
- YGMeasureModeName(heightMeasureMode, performLayout),
- layout->measuredDimensions[YGDimensionWidth],
- layout->measuredDimensions[YGDimensionHeight],
- reason);
- }
-
- layout->lastParentDirection = parentDirection;
-
- if (cachedResults == nullptr) {
- if (layout->nextCachedMeasurementsIndex == YG_MAX_CACHED_RESULT_COUNT) {
- if (gPrintChanges) {
- YGLog(node, YGLogLevelVerbose, "Out of cache entries!\n");
- }
- layout->nextCachedMeasurementsIndex = 0;
- }
-
- YGCachedMeasurement *newCacheEntry;
- if (performLayout) {
- // Use the single layout cache entry.
- newCacheEntry = &layout->cachedLayout;
- } else {
- // Allocate a new measurement cache entry.
- newCacheEntry = &layout->cachedMeasurements[layout->nextCachedMeasurementsIndex];
- layout->nextCachedMeasurementsIndex++;
- }
-
- newCacheEntry->availableWidth = availableWidth;
- newCacheEntry->availableHeight = availableHeight;
- newCacheEntry->widthMeasureMode = widthMeasureMode;
- newCacheEntry->heightMeasureMode = heightMeasureMode;
- newCacheEntry->computedWidth = layout->measuredDimensions[YGDimensionWidth];
- newCacheEntry->computedHeight = layout->measuredDimensions[YGDimensionHeight];
- }
- }
-
- if (performLayout) {
- node->layout.dimensions[YGDimensionWidth] = node->layout.measuredDimensions[YGDimensionWidth];
- node->layout.dimensions[YGDimensionHeight] = node->layout.measuredDimensions[YGDimensionHeight];
- node->hasNewLayout = true;
- node->isDirty = false;
- }
-
- gDepth--;
- layout->generationCount = gCurrentGenerationCount;
- return (needToVisitNode || cachedResults == nullptr);
-}
-
-void YGConfigSetPointScaleFactor(const YGConfigRef config, const float pixelsInPoint) {
- YGAssertWithConfig(config, pixelsInPoint >= 0.0f, "Scale factor should not be less than zero");
-
- // We store points for Pixel as we will use it for rounding
- if (pixelsInPoint == 0.0f) {
- // Zero is used to skip rounding
- config->pointScaleFactor = 0.0f;
- } else {
- config->pointScaleFactor = pixelsInPoint;
- }
-}
-
-static void YGRoundToPixelGrid(const YGNodeRef node,
- const float pointScaleFactor,
- const float absoluteLeft,
- const float absoluteTop) {
- if (pointScaleFactor == 0.0f) {
- return;
- }
-
- const float nodeLeft = node->layout.position[YGEdgeLeft];
- const float nodeTop = node->layout.position[YGEdgeTop];
-
- const float nodeWidth = node->layout.dimensions[YGDimensionWidth];
- const float nodeHeight = node->layout.dimensions[YGDimensionHeight];
-
- const float absoluteNodeLeft = absoluteLeft + nodeLeft;
- const float absoluteNodeTop = absoluteTop + nodeTop;
-
- const float absoluteNodeRight = absoluteNodeLeft + nodeWidth;
- const float absoluteNodeBottom = absoluteNodeTop + nodeHeight;
-
- // If a node has a custom measure function we never want to round down its size as this could
- // lead to unwanted text truncation.
- const bool textRounding = node->nodeType == YGNodeTypeText;
-
- node->layout.position[YGEdgeLeft] =
- YGRoundValueToPixelGrid(nodeLeft, pointScaleFactor, false, textRounding);
- node->layout.position[YGEdgeTop] =
- YGRoundValueToPixelGrid(nodeTop, pointScaleFactor, false, textRounding);
-
- // We multiply dimension by scale factor and if the result is close to the whole number, we don't
- // have any fraction
- // To verify if the result is close to whole number we want to check both floor and ceil numbers
- const bool hasFractionalWidth = !YGFloatsEqual(fmodf(nodeWidth * pointScaleFactor, 1.0), 0) &&
- !YGFloatsEqual(fmodf(nodeWidth * pointScaleFactor, 1.0), 1.0);
- const bool hasFractionalHeight = !YGFloatsEqual(fmodf(nodeHeight * pointScaleFactor, 1.0), 0) &&
- !YGFloatsEqual(fmodf(nodeHeight * pointScaleFactor, 1.0), 1.0);
-
- node->layout.dimensions[YGDimensionWidth] =
- YGRoundValueToPixelGrid(absoluteNodeRight,
- pointScaleFactor,
- (textRounding && hasFractionalWidth),
- (textRounding && !hasFractionalWidth)) -
- YGRoundValueToPixelGrid(absoluteNodeLeft, pointScaleFactor, false, textRounding);
- node->layout.dimensions[YGDimensionHeight] =
- YGRoundValueToPixelGrid(absoluteNodeBottom,
- pointScaleFactor,
- (textRounding && hasFractionalHeight),
- (textRounding && !hasFractionalHeight)) -
- YGRoundValueToPixelGrid(absoluteNodeTop, pointScaleFactor, false, textRounding);
-
- const uint32_t childCount = node->children.size();
- for (uint32_t i = 0; i < childCount; i++) {
- YGRoundToPixelGrid(YGNodeGetChild(node, i), pointScaleFactor, absoluteNodeLeft, absoluteNodeTop);
- }
-}
-
-void YGNodeCalculateLayout(const YGNodeRef node,
- const float parentWidth,
- const float parentHeight,
- const YGDirection parentDirection) {
- // Increment the generation count. This will force the recursive routine to
- // visit
- // all dirty nodes at least once. Subsequent visits will be skipped if the
- // input
- // parameters don't change.
- gCurrentGenerationCount++;
-
- YGResolveDimensions(node);
-
- float width = YGUndefined;
- YGMeasureMode widthMeasureMode = YGMeasureModeUndefined;
- if (YGNodeIsStyleDimDefined(node, YGFlexDirectionRow, parentWidth)) {
- width = YGResolveValue(node->resolvedDimensions[dim[YGFlexDirectionRow]], parentWidth) +
- YGNodeMarginForAxis(node, YGFlexDirectionRow, parentWidth);
- widthMeasureMode = YGMeasureModeExactly;
- } else if (YGResolveValue(&node->style.maxDimensions[YGDimensionWidth], parentWidth) >= 0.0f) {
- width = YGResolveValue(&node->style.maxDimensions[YGDimensionWidth], parentWidth);
- widthMeasureMode = YGMeasureModeAtMost;
- } else {
- width = parentWidth;
- widthMeasureMode = YGFloatIsUndefined(width) ? YGMeasureModeUndefined : YGMeasureModeExactly;
- }
-
- float height = YGUndefined;
- YGMeasureMode heightMeasureMode = YGMeasureModeUndefined;
- if (YGNodeIsStyleDimDefined(node, YGFlexDirectionColumn, parentHeight)) {
- height = YGResolveValue(node->resolvedDimensions[dim[YGFlexDirectionColumn]], parentHeight) +
- YGNodeMarginForAxis(node, YGFlexDirectionColumn, parentWidth);
- heightMeasureMode = YGMeasureModeExactly;
- } else if (YGResolveValue(&node->style.maxDimensions[YGDimensionHeight], parentHeight) >= 0.0f) {
- height = YGResolveValue(&node->style.maxDimensions[YGDimensionHeight], parentHeight);
- heightMeasureMode = YGMeasureModeAtMost;
- } else {
- height = parentHeight;
- heightMeasureMode = YGFloatIsUndefined(height) ? YGMeasureModeUndefined : YGMeasureModeExactly;
- }
-
- if (YGLayoutNodeInternal(node,
- width,
- height,
- parentDirection,
- widthMeasureMode,
- heightMeasureMode,
- parentWidth,
- parentHeight,
- true,
- "initial",
- node->config)) {
- YGNodeSetPosition(node, node->layout.direction, parentWidth, parentHeight, parentWidth);
- YGRoundToPixelGrid(node, node->config->pointScaleFactor, 0.0f, 0.0f);
-
- if (gPrintTree) {
- YGNodePrint(
- node,
- (YGPrintOptions)(
- YGPrintOptionsLayout | YGPrintOptionsChildren |
- YGPrintOptionsStyle));
- }
- }
-}
-
-void YGConfigSetLogger(const YGConfigRef config, YGLogger logger) {
- if (logger != nullptr) {
- config->logger = logger;
- } else {
-#ifdef ANDROID
- config->logger = &YGAndroidLog;
-#else
- config->logger = &YGDefaultLog;
-#endif
- }
-}
-
-static void YGVLog(const YGConfigRef config,
- const YGNodeRef node,
- YGLogLevel level,
- const char *format,
- va_list args) {
- const YGConfigRef logConfig = config != nullptr ? config : &gYGConfigDefaults;
- logConfig->logger(logConfig, node, level, format, args);
-
- if (level == YGLogLevelFatal) {
- abort();
- }
-}
-
-void YGLogWithConfig(const YGConfigRef config, YGLogLevel level, const char *format, ...) {
- va_list args;
- va_start(args, format);
- YGVLog(config, nullptr, level, format, args);
- va_end(args);
-}
-
-void YGLog(const YGNodeRef node, YGLogLevel level, const char *format, ...) {
- va_list args;
- va_start(args, format);
- YGVLog(node == nullptr ? nullptr : node->config, node, level, format, args);
- va_end(args);
-}
-
-void YGAssert(const bool condition, const char *message) {
- if (!condition) {
- YGLog(nullptr, YGLogLevelFatal, "%s\n", message);
- }
-}
-
-void YGAssertWithNode(const YGNodeRef node, const bool condition, const char *message) {
- if (!condition) {
- YGLog(node, YGLogLevelFatal, "%s\n", message);
- }
-}
-
-void YGAssertWithConfig(const YGConfigRef config, const bool condition, const char *message) {
- if (!condition) {
- YGLogWithConfig(config, YGLogLevelFatal, "%s\n", message);
- }
-}
-
-void YGConfigSetExperimentalFeatureEnabled(const YGConfigRef config,
- const YGExperimentalFeature feature,
- const bool enabled) {
- config->experimentalFeatures[feature] = enabled;
-}
-
-inline bool YGConfigIsExperimentalFeatureEnabled(const YGConfigRef config,
- const YGExperimentalFeature feature) {
- return config->experimentalFeatures[feature];
-}
-
-void YGConfigSetUseWebDefaults(const YGConfigRef config, const bool enabled) {
- config->useWebDefaults = enabled;
-}
-
-void YGConfigSetUseLegacyStretchBehaviour(const YGConfigRef config,
- const bool useLegacyStretchBehaviour) {
- config->useLegacyStretchBehaviour = useLegacyStretchBehaviour;
-}
-
-bool YGConfigGetUseWebDefaults(const YGConfigRef config) {
- return config->useWebDefaults;
-}
-
-void YGConfigSetContext(const YGConfigRef config, void *context) {
- config->context = context;
-}
-
-void *YGConfigGetContext(const YGConfigRef config) {
- return config->context;
-}
-
-void YGConfigSetNodeClonedFunc(const YGConfigRef config, const YGNodeClonedFunc callback) {
- config->cloneNodeCallback = callback;
-}
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+
+#include "Yoga.h"
+#include <float.h>
+#include <string.h>
+#include <algorithm>
+#include "Utils.h"
+#include "YGNode.h"
+#include "YGNodePrint.h"
+#include "Yoga-internal.h"
+#ifdef _MSC_VER
+#include <float.h>
+
+/* define fmaxf if < VC12 */
+#if _MSC_VER < 1800
+__forceinline const float fmaxf(const float a, const float b) {
+ if (!YGFloatIsUndefined(a) && !YGFloatIsUndefined(b)) {
+ return (a > b) ? a : b;
+ }
+ return YGFloatIsUndefined(a) ? b : a;
+}
+#endif
+#endif
+
+#ifdef ANDROID
+static int YGAndroidLog(
+ const YGConfigRef config,
+ const YGNodeRef node,
+ YGLogLevel level,
+ const char* format,
+ va_list args);
+#else
+static int YGDefaultLog(
+ const YGConfigRef config,
+ const YGNodeRef node,
+ YGLogLevel level,
+ const char* format,
+ va_list args);
+#endif
+
+const YGValue YGValueZero = {0, YGUnitPoint};
+const YGValue YGValueUndefined = {YGUndefined, YGUnitUndefined};
+const YGValue YGValueAuto = {YGUndefined, YGUnitAuto};
+
+bool operator==(const YGValue& lhs, const YGValue& rhs) {
+ if ((lhs.unit == YGUnitUndefined && rhs.unit == YGUnitUndefined) ||
+ (lhs.unit == YGUnitAuto && rhs.unit == YGUnitAuto)) {
+ return true;
+ }
+
+ return lhs.unit == rhs.unit && lhs.value == rhs.value;
+}
+
+bool operator!=(const YGValue& lhs, const YGValue& rhs) {
+ return !(lhs == rhs);
+}
+
+#ifdef ANDROID
+#include <android/log.h>
+static int YGAndroidLog(
+ const YGConfigRef config,
+ const YGNodeRef node,
+ YGLogLevel level,
+ const char* format,
+ va_list args) {
+ int androidLevel = YGLogLevelDebug;
+ switch (level) {
+ case YGLogLevelFatal:
+ androidLevel = ANDROID_LOG_FATAL;
+ break;
+ case YGLogLevelError:
+ androidLevel = ANDROID_LOG_ERROR;
+ break;
+ case YGLogLevelWarn:
+ androidLevel = ANDROID_LOG_WARN;
+ break;
+ case YGLogLevelInfo:
+ androidLevel = ANDROID_LOG_INFO;
+ break;
+ case YGLogLevelDebug:
+ androidLevel = ANDROID_LOG_DEBUG;
+ break;
+ case YGLogLevelVerbose:
+ androidLevel = ANDROID_LOG_VERBOSE;
+ break;
+ }
+ const int result = __android_log_vprint(androidLevel, "yoga", format, args);
+ return result;
+}
+#else
+#define YG_UNUSED(x) (void)(x);
+
+static int YGDefaultLog(
+ const YGConfigRef config,
+ const YGNodeRef node,
+ YGLogLevel level,
+ const char* format,
+ va_list args) {
+ YG_UNUSED(config);
+ YG_UNUSED(node);
+ switch (level) {
+ case YGLogLevelError:
+ case YGLogLevelFatal:
+ return vfprintf(stderr, format, args);
+ case YGLogLevelWarn:
+ case YGLogLevelInfo:
+ case YGLogLevelDebug:
+ case YGLogLevelVerbose:
+ default:
+ return vprintf(format, args);
+ }
+}
+
+#undef YG_UNUSED
+#endif
+
+bool YGFloatIsUndefined(const float value) {
+ return facebook::yoga::isUndefined(value);
+}
+
+const YGValue* YGComputedEdgeValue(
+ const std::array<YGValue, YGEdgeCount>& edges,
+ const YGEdge edge,
+ const YGValue* const defaultValue) {
+ if (edges[edge].unit != YGUnitUndefined) {
+ return &edges[edge];
+ }
+
+ if ((edge == YGEdgeTop || edge == YGEdgeBottom) &&
+ edges[YGEdgeVertical].unit != YGUnitUndefined) {
+ return &edges[YGEdgeVertical];
+ }
+
+ if ((edge == YGEdgeLeft || edge == YGEdgeRight || edge == YGEdgeStart ||
+ edge == YGEdgeEnd) &&
+ edges[YGEdgeHorizontal].unit != YGUnitUndefined) {
+ return &edges[YGEdgeHorizontal];
+ }
+
+ if (edges[YGEdgeAll].unit != YGUnitUndefined) {
+ return &edges[YGEdgeAll];
+ }
+
+ if (edge == YGEdgeStart || edge == YGEdgeEnd) {
+ return &YGValueUndefined;
+ }
+
+ return defaultValue;
+}
+
+void* YGNodeGetContext(YGNodeRef node) {
+ return node->getContext();
+}
+
+void YGNodeSetContext(YGNodeRef node, void* context) {
+ return node->setContext(context);
+}
+
+YGMeasureFunc YGNodeGetMeasureFunc(YGNodeRef node) {
+ return node->getMeasure();
+}
+
+void YGNodeSetMeasureFunc(YGNodeRef node, YGMeasureFunc measureFunc) {
+ node->setMeasureFunc(measureFunc);
+}
+
+YGBaselineFunc YGNodeGetBaselineFunc(YGNodeRef node) {
+ return node->getBaseline();
+}
+
+void YGNodeSetBaselineFunc(YGNodeRef node, YGBaselineFunc baselineFunc) {
+ node->setBaseLineFunc(baselineFunc);
+}
+
+YGDirtiedFunc YGNodeGetDirtiedFunc(YGNodeRef node) {
+ return node->getDirtied();
+}
+
+void YGNodeSetDirtiedFunc(YGNodeRef node, YGDirtiedFunc dirtiedFunc) {
+ node->setDirtiedFunc(dirtiedFunc);
+}
+
+YGPrintFunc YGNodeGetPrintFunc(YGNodeRef node) {
+ return node->getPrintFunc();
+}
+
+void YGNodeSetPrintFunc(YGNodeRef node, YGPrintFunc printFunc) {
+ node->setPrintFunc(printFunc);
+}
+
+bool YGNodeGetHasNewLayout(YGNodeRef node) {
+ return node->getHasNewLayout();
+}
+
+void YGConfigSetPrintTreeFlag(YGConfigRef config, bool enabled) {
+ config->printTree = enabled;
+}
+
+void YGNodeSetHasNewLayout(YGNodeRef node, bool hasNewLayout) {
+ node->setHasNewLayout(hasNewLayout);
+}
+
+YGNodeType YGNodeGetNodeType(YGNodeRef node) {
+ return node->getNodeType();
+}
+
+void YGNodeSetNodeType(YGNodeRef node, YGNodeType nodeType) {
+ return node->setNodeType(nodeType);
+}
+
+bool YGNodeIsDirty(YGNodeRef node) {
+ return node->isDirty();
+}
+
+bool YGNodeLayoutGetDidUseLegacyFlag(const YGNodeRef node) {
+ return node->didUseLegacyFlag();
+}
+
+void YGNodeMarkDirtyAndPropogateToDescendants(const YGNodeRef node) {
+ return node->markDirtyAndPropogateDownwards();
+}
+
+int32_t gNodeInstanceCount = 0;
+int32_t gConfigInstanceCount = 0;
+
+WIN_EXPORT YGNodeRef YGNodeNewWithConfig(const YGConfigRef config) {
+ const YGNodeRef node = new YGNode();
+ YGAssertWithConfig(
+ config, node != nullptr, "Could not allocate memory for node");
+ gNodeInstanceCount++;
+
+ if (config->useWebDefaults) {
+ node->setStyleFlexDirection(YGFlexDirectionRow);
+ node->setStyleAlignContent(YGAlignStretch);
+ }
+ node->setConfig(config);
+ return node;
+}
+
+YGConfigRef YGConfigGetDefault() {
+ static YGConfigRef defaultConfig = YGConfigNew();
+ return defaultConfig;
+}
+
+YGNodeRef YGNodeNew(void) {
+ return YGNodeNewWithConfig(YGConfigGetDefault());
+}
+
+YGNodeRef YGNodeClone(YGNodeRef oldNode) {
+ YGNodeRef node = new YGNode(*oldNode);
+ YGAssertWithConfig(
+ oldNode->getConfig(),
+ node != nullptr,
+ "Could not allocate memory for node");
+ gNodeInstanceCount++;
+ node->setOwner(nullptr);
+ return node;
+}
+
+static YGConfigRef YGConfigClone(const YGConfig& oldConfig) {
+ const YGConfigRef config = new YGConfig(oldConfig);
+ YGAssert(config != nullptr, "Could not allocate memory for config");
+ if (config == nullptr) {
+ abort();
+ }
+ gConfigInstanceCount++;
+ return config;
+}
+
+static YGNodeRef YGNodeDeepClone(YGNodeRef oldNode) {
+ YGNodeRef node = YGNodeClone(oldNode);
+ YGVector vec = YGVector();
+ vec.reserve(oldNode->getChildren().size());
+ YGNodeRef childNode = nullptr;
+ for (auto* item : oldNode->getChildren()) {
+ childNode = YGNodeDeepClone(item);
+ childNode->setOwner(node);
+ vec.push_back(childNode);
+ }
+ node->setChildren(vec);
+
+ if (oldNode->getConfig() != nullptr) {
+ node->setConfig(YGConfigClone(*(oldNode->getConfig())));
+ }
+
+ return node;
+}
+
+void YGNodeFree(const YGNodeRef node) {
+ if (YGNodeRef owner = node->getOwner()) {
+ owner->removeChild(node);
+ node->setOwner(nullptr);
+ }
+
+ const uint32_t childCount = YGNodeGetChildCount(node);
+ for (uint32_t i = 0; i < childCount; i++) {
+ const YGNodeRef child = YGNodeGetChild(node, i);
+ child->setOwner(nullptr);
+ }
+
+ node->clearChildren();
+ delete node;
+ gNodeInstanceCount--;
+}
+
+static void YGConfigFreeRecursive(const YGNodeRef root) {
+ if (root->getConfig() != nullptr) {
+ gConfigInstanceCount--;
+ delete root->getConfig();
+ }
+ // Delete configs recursively for childrens
+ for (auto* child : root->getChildren()) {
+ YGConfigFreeRecursive(child);
+ }
+}
+
+void YGNodeFreeRecursive(const YGNodeRef root) {
+ while (YGNodeGetChildCount(root) > 0) {
+ const YGNodeRef child = YGNodeGetChild(root, 0);
+ if (child->getOwner() != root) {
+ // Don't free shared nodes that we don't own.
+ break;
+ }
+ YGNodeRemoveChild(root, child);
+ YGNodeFreeRecursive(child);
+ }
+ YGNodeFree(root);
+}
+
+void YGNodeReset(const YGNodeRef node) {
+ YGAssertWithNode(
+ node,
+ YGNodeGetChildCount(node) == 0,
+ "Cannot reset a node which still has children attached");
+ YGAssertWithNode(
+ node,
+ node->getOwner() == nullptr,
+ "Cannot reset a node still attached to a owner");
+
+ node->clearChildren();
+
+ const YGConfigRef config = node->getConfig();
+ *node = YGNode();
+ if (config->useWebDefaults) {
+ node->setStyleFlexDirection(YGFlexDirectionRow);
+ node->setStyleAlignContent(YGAlignStretch);
+ }
+ node->setConfig(config);
+}
+
+int32_t YGNodeGetInstanceCount(void) {
+ return gNodeInstanceCount;
+}
+
+int32_t YGConfigGetInstanceCount(void) {
+ return gConfigInstanceCount;
+}
+
+YGConfigRef YGConfigNew(void) {
+#ifdef ANDROID
+ const YGConfigRef config = new YGConfig(YGAndroidLog);
+#else
+ const YGConfigRef config = new YGConfig(YGDefaultLog);
+#endif
+ gConfigInstanceCount++;
+ return config;
+}
+
+void YGConfigFree(const YGConfigRef config) {
+ delete config;
+ gConfigInstanceCount--;
+}
+
+void YGConfigCopy(const YGConfigRef dest, const YGConfigRef src) {
+ memcpy(dest, src, sizeof(YGConfig));
+}
+
+void YGNodeInsertChild(
+ const YGNodeRef node,
+ const YGNodeRef child,
+ const uint32_t index) {
+ YGAssertWithNode(
+ node,
+ child->getOwner() == nullptr,
+ "Child already has a owner, it must be removed first.");
+
+ YGAssertWithNode(
+ node,
+ node->getMeasure() == nullptr,
+ "Cannot add child: Nodes with measure functions cannot have children.");
+
+ node->cloneChildrenIfNeeded();
+ node->insertChild(child, index);
+ YGNodeRef owner = child->getOwner() ? nullptr : node;
+ child->setOwner(owner);
+ node->markDirtyAndPropogate();
+}
+
+void YGNodeInsertSharedChild(
+ const YGNodeRef node,
+ const YGNodeRef child,
+ const uint32_t index) {
+ YGAssertWithNode(
+ node,
+ node->getMeasure() == nullptr,
+ "Cannot add child: Nodes with measure functions cannot have children.");
+
+ node->insertChild(child, index);
+ child->setOwner(nullptr);
+ node->markDirtyAndPropogate();
+}
+
+void YGNodeRemoveChild(const YGNodeRef owner, const YGNodeRef excludedChild) {
+ // This algorithm is a forked variant from cloneChildrenIfNeeded in YGNode
+ // that excludes a child.
+ const uint32_t childCount = YGNodeGetChildCount(owner);
+
+ if (childCount == 0) {
+ // This is an empty set. Nothing to remove.
+ return;
+ }
+ const YGNodeRef firstChild = YGNodeGetChild(owner, 0);
+ if (firstChild->getOwner() == owner) {
+ // If the first child has this node as its owner, we assume that it is
+ // already unique. We can now try to delete a child in this list.
+ if (owner->removeChild(excludedChild)) {
+ excludedChild->setLayout(
+ YGNode().getLayout()); // layout is no longer valid
+ excludedChild->setOwner(nullptr);
+ owner->markDirtyAndPropogate();
+ }
+ return;
+ }
+ // Otherwise we have to clone the node list except for the child we're trying
+ // to delete. We don't want to simply clone all children, because then the
+ // host will need to free the clone of the child that was just deleted.
+ const YGCloneNodeFunc cloneNodeCallback =
+ owner->getConfig()->cloneNodeCallback;
+ uint32_t nextInsertIndex = 0;
+ for (uint32_t i = 0; i < childCount; i++) {
+ const YGNodeRef oldChild = owner->getChild(i);
+ if (excludedChild == oldChild) {
+ // Ignore the deleted child. Don't reset its layout or owner since it is
+ // still valid in the other owner. However, since this owner has now
+ // changed, we need to mark it as dirty.
+ owner->markDirtyAndPropogate();
+ continue;
+ }
+ YGNodeRef newChild = nullptr;
+ if (cloneNodeCallback) {
+ newChild = cloneNodeCallback(oldChild, owner, nextInsertIndex);
+ }
+ if (newChild == nullptr) {
+ newChild = YGNodeClone(oldChild);
+ }
+ owner->replaceChild(newChild, nextInsertIndex);
+ newChild->setOwner(owner);
+
+ nextInsertIndex++;
+ }
+ while (nextInsertIndex < childCount) {
+ owner->removeChild(nextInsertIndex);
+ nextInsertIndex++;
+ }
+}
+
+void YGNodeRemoveAllChildren(const YGNodeRef owner) {
+ const uint32_t childCount = YGNodeGetChildCount(owner);
+ if (childCount == 0) {
+ // This is an empty set already. Nothing to do.
+ return;
+ }
+ const YGNodeRef firstChild = YGNodeGetChild(owner, 0);
+ if (firstChild->getOwner() == owner) {
+ // If the first child has this node as its owner, we assume that this child
+ // set is unique.
+ for (uint32_t i = 0; i < childCount; i++) {
+ const YGNodeRef oldChild = YGNodeGetChild(owner, i);
+ oldChild->setLayout(YGNode().getLayout()); // layout is no longer valid
+ oldChild->setOwner(nullptr);
+ }
+ owner->clearChildren();
+ owner->markDirtyAndPropogate();
+ return;
+ }
+ // Otherwise, we are not the owner of the child set. We don't have to do
+ // anything to clear it.
+ owner->setChildren(YGVector());
+ owner->markDirtyAndPropogate();
+}
+
+static void YGNodeSetChildrenInternal(
+ YGNodeRef const owner,
+ const std::vector<YGNodeRef>& children) {
+ if (!owner) {
+ return;
+ }
+ if (children.size() == 0) {
+ if (YGNodeGetChildCount(owner) > 0) {
+ for (YGNodeRef const child : owner->getChildren()) {
+ child->setLayout(YGLayout());
+ child->setOwner(nullptr);
+ }
+ owner->setChildren(YGVector());
+ owner->markDirtyAndPropogate();
+ }
+ } else {
+ if (YGNodeGetChildCount(owner) > 0) {
+ for (YGNodeRef const oldChild : owner->getChildren()) {
+ // Our new children may have nodes in common with the old children. We
+ // don't reset these common nodes.
+ if (std::find(children.begin(), children.end(), oldChild) ==
+ children.end()) {
+ oldChild->setLayout(YGLayout());
+ oldChild->setOwner(nullptr);
+ }
+ }
+ }
+ owner->setChildren(children);
+ for (YGNodeRef child : children) {
+ child->setOwner(owner);
+ }
+ owner->markDirtyAndPropogate();
+ }
+}
+
+void YGNodeSetChildren(
+ YGNodeRef const owner,
+ const YGNodeRef c[],
+ const uint32_t count) {
+ const YGVector children = {c, c + count};
+ YGNodeSetChildrenInternal(owner, children);
+}
+
+void YGNodeSetChildren(
+ YGNodeRef const owner,
+ const std::vector<YGNodeRef>& children) {
+ YGNodeSetChildrenInternal(owner, children);
+}
+
+YGNodeRef YGNodeGetChild(const YGNodeRef node, const uint32_t index) {
+ if (index < node->getChildren().size()) {
+ return node->getChild(index);
+ }
+ return nullptr;
+}
+
+uint32_t YGNodeGetChildCount(const YGNodeRef node) {
+ return static_cast<uint32_t>(node->getChildren().size());
+}
+
+YGNodeRef YGNodeGetOwner(const YGNodeRef node) {
+ return node->getOwner();
+}
+
+YGNodeRef YGNodeGetParent(const YGNodeRef node) {
+ return node->getOwner();
+}
+
+void YGNodeMarkDirty(const YGNodeRef node) {
+ YGAssertWithNode(
+ node,
+ node->getMeasure() != nullptr,
+ "Only leaf nodes with custom measure functions"
+ "should manually mark themselves as dirty");
+
+ node->markDirtyAndPropogate();
+}
+
+void YGNodeCopyStyle(const YGNodeRef dstNode, const YGNodeRef srcNode) {
+ if (!(dstNode->getStyle() == srcNode->getStyle())) {
+ dstNode->setStyle(srcNode->getStyle());
+ dstNode->markDirtyAndPropogate();
+ }
+}
+
+float YGNodeStyleGetFlexGrow(const YGNodeRef node) {
+ return node->getStyle().flexGrow.isUndefined()
+ ? kDefaultFlexGrow
+ : node->getStyle().flexGrow.getValue();
+}
+
+float YGNodeStyleGetFlexShrink(const YGNodeRef node) {
+ return node->getStyle().flexShrink.isUndefined()
+ ? (node->getConfig()->useWebDefaults ? kWebDefaultFlexShrink
+ : kDefaultFlexShrink)
+ : node->getStyle().flexShrink.getValue();
+}
+
+namespace {
+
+template <typename T, T YGStyle::*P>
+struct StyleProp {
+ static T get(YGNodeRef node) {
+ return node->getStyle().*P;
+ }
+ static void set(YGNodeRef node, T newValue) {
+ if (node->getStyle().*P != newValue) {
+ node->getStyle().*P = newValue;
+ node->markDirtyAndPropogate();
+ }
+ }
+};
+
+struct Value {
+ template <YGUnit U>
+ static YGValue create(float value) {
+ return {
+ YGFloatSanitize(value),
+ YGFloatIsUndefined(value) ? YGUnitUndefined : U,
+ };
+ }
+};
+
+template <YGStyle::Dimensions YGStyle::*P>
+struct DimensionProp {
+ template <YGDimension idx>
+ static WIN_STRUCT(YGValue) get(YGNodeRef node) {
+ YGValue value = (node->getStyle().*P)[idx];
+ if (value.unit == YGUnitUndefined || value.unit == YGUnitAuto) {
+ value.value = YGUndefined;
+ }
+ return WIN_STRUCT_REF(value);
+ }
+
+ template <YGDimension idx, YGUnit U>
+ static void set(YGNodeRef node, float newValue) {
+ YGValue value = Value::create<U>(newValue);
+ if (((node->getStyle().*P)[idx].value != value.value &&
+ value.unit != YGUnitUndefined) ||
+ (node->getStyle().*P)[idx].unit != value.unit) {
+ (node->getStyle().*P)[idx] = value;
+ node->markDirtyAndPropogate();
+ }
+ }
+};
+
+} // namespace
+
+#define YG_NODE_STYLE_PROPERTY_SETTER_UNIT_AUTO_IMPL( \
+ type, name, paramName, instanceName) \
+ void YGNodeStyleSet##name(const YGNodeRef node, const type paramName) { \
+ YGValue value = { \
+ YGFloatSanitize(paramName), \
+ YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
+ }; \
+ if ((node->getStyle().instanceName.value != value.value && \
+ value.unit != YGUnitUndefined) || \
+ node->getStyle().instanceName.unit != value.unit) { \
+ node->getStyle().instanceName = value; \
+ node->markDirtyAndPropogate(); \
+ } \
+ } \
+ \
+ void YGNodeStyleSet##name##Percent( \
+ const YGNodeRef node, const type paramName) { \
+ if (node->getStyle().instanceName.value != YGFloatSanitize(paramName) || \
+ node->getStyle().instanceName.unit != YGUnitPercent) { \
+ node->getStyle().instanceName = YGFloatIsUndefined(paramName) \
+ ? YGValue{0, YGUnitAuto} \
+ : YGValue{paramName, YGUnitPercent}; \
+ node->markDirtyAndPropogate(); \
+ } \
+ } \
+ \
+ void YGNodeStyleSet##name##Auto(const YGNodeRef node) { \
+ if (node->getStyle().instanceName.unit != YGUnitAuto) { \
+ node->getStyle().instanceName = {0, YGUnitAuto}; \
+ node->markDirtyAndPropogate(); \
+ } \
+ }
+
+#define YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL( \
+ type, name, paramName, instanceName) \
+ YG_NODE_STYLE_PROPERTY_SETTER_UNIT_AUTO_IMPL( \
+ float, name, paramName, instanceName) \
+ \
+ type YGNodeStyleGet##name(const YGNodeRef node) { \
+ YGValue value = node->getStyle().instanceName; \
+ if (value.unit == YGUnitUndefined || value.unit == YGUnitAuto) { \
+ value.value = YGUndefined; \
+ } \
+ return value; \
+ }
+
+#define YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO_IMPL(type, name, instanceName) \
+ void YGNodeStyleSet##name##Auto(const YGNodeRef node, const YGEdge edge) { \
+ if (node->getStyle().instanceName[edge].unit != YGUnitAuto) { \
+ node->getStyle().instanceName[edge] = {0, YGUnitAuto}; \
+ node->markDirtyAndPropogate(); \
+ } \
+ }
+
+#define YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL( \
+ type, name, paramName, instanceName) \
+ void YGNodeStyleSet##name( \
+ const YGNodeRef node, const YGEdge edge, const float paramName) { \
+ YGValue value = { \
+ YGFloatSanitize(paramName), \
+ YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
+ }; \
+ if ((node->getStyle().instanceName[edge].value != value.value && \
+ value.unit != YGUnitUndefined) || \
+ node->getStyle().instanceName[edge].unit != value.unit) { \
+ node->getStyle().instanceName[edge] = value; \
+ node->markDirtyAndPropogate(); \
+ } \
+ } \
+ \
+ void YGNodeStyleSet##name##Percent( \
+ const YGNodeRef node, const YGEdge edge, const float paramName) { \
+ YGValue value = { \
+ YGFloatSanitize(paramName), \
+ YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPercent, \
+ }; \
+ if ((node->getStyle().instanceName[edge].value != value.value && \
+ value.unit != YGUnitUndefined) || \
+ node->getStyle().instanceName[edge].unit != value.unit) { \
+ node->getStyle().instanceName[edge] = value; \
+ node->markDirtyAndPropogate(); \
+ } \
+ } \
+ \
+ WIN_STRUCT(type) \
+ YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge) { \
+ YGValue value = node->getStyle().instanceName[edge]; \
+ if (value.unit == YGUnitUndefined || value.unit == YGUnitAuto) { \
+ value.value = YGUndefined; \
+ } \
+ return WIN_STRUCT_REF(value); \
+ }
+
+#define YG_NODE_LAYOUT_PROPERTY_IMPL(type, name, instanceName) \
+ type YGNodeLayoutGet##name(const YGNodeRef node) { \
+ return node->getLayout().instanceName; \
+ }
+
+#define YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(type, name, instanceName) \
+ type YGNodeLayoutGet##name(const YGNodeRef node, const YGEdge edge) { \
+ YGAssertWithNode( \
+ node, \
+ edge <= YGEdgeEnd, \
+ "Cannot get layout properties of multi-edge shorthands"); \
+ \
+ if (edge == YGEdgeLeft) { \
+ if (node->getLayout().direction == YGDirectionRTL) { \
+ return node->getLayout().instanceName[YGEdgeEnd]; \
+ } else { \
+ return node->getLayout().instanceName[YGEdgeStart]; \
+ } \
+ } \
+ \
+ if (edge == YGEdgeRight) { \
+ if (node->getLayout().direction == YGDirectionRTL) { \
+ return node->getLayout().instanceName[YGEdgeStart]; \
+ } else { \
+ return node->getLayout().instanceName[YGEdgeEnd]; \
+ } \
+ } \
+ \
+ return node->getLayout().instanceName[edge]; \
+ }
+
+void YGNodeStyleSetDirection(
+ const YGNodeRef node,
+ const YGDirection direction) {
+ StyleProp<YGDirection, &YGStyle::direction>::set(node, direction);
+}
+YGDirection YGNodeStyleGetDirection(const YGNodeRef node) {
+ return StyleProp<YGDirection, &YGStyle::direction>::get(node);
+}
+
+void YGNodeStyleSetFlexDirection(
+ const YGNodeRef node,
+ const YGFlexDirection flexDirection) {
+ StyleProp<YGFlexDirection, &YGStyle::flexDirection>::set(node, flexDirection);
+}
+YGFlexDirection YGNodeStyleGetFlexDirection(const YGNodeRef node) {
+ return StyleProp<YGFlexDirection, &YGStyle::flexDirection>::get(node);
+}
+
+void YGNodeStyleSetJustifyContent(
+ const YGNodeRef node,
+ const YGJustify justifyContent) {
+ StyleProp<YGJustify, &YGStyle::justifyContent>::set(node, justifyContent);
+}
+YGJustify YGNodeStyleGetJustifyContent(const YGNodeRef node) {
+ return StyleProp<YGJustify, &YGStyle::justifyContent>::get(node);
+}
+
+void YGNodeStyleSetAlignContent(
+ const YGNodeRef node,
+ const YGAlign alignContent) {
+ StyleProp<YGAlign, &YGStyle::alignContent>::set(node, alignContent);
+}
+YGAlign YGNodeStyleGetAlignContent(const YGNodeRef node) {
+ return StyleProp<YGAlign, &YGStyle::alignContent>::get(node);
+}
+
+void YGNodeStyleSetAlignItems(const YGNodeRef node, const YGAlign alignItems) {
+ StyleProp<YGAlign, &YGStyle::alignItems>::set(node, alignItems);
+}
+YGAlign YGNodeStyleGetAlignItems(const YGNodeRef node) {
+ return StyleProp<YGAlign, &YGStyle::alignItems>::get(node);
+}
+
+void YGNodeStyleSetAlignSelf(const YGNodeRef node, const YGAlign alignSelf) {
+ StyleProp<YGAlign, &YGStyle::alignSelf>::set(node, alignSelf);
+}
+YGAlign YGNodeStyleGetAlignSelf(const YGNodeRef node) {
+ return StyleProp<YGAlign, &YGStyle::alignSelf>::get(node);
+}
+
+void YGNodeStyleSetPositionType(
+ const YGNodeRef node,
+ const YGPositionType positionType) {
+ StyleProp<YGPositionType, &YGStyle::positionType>::set(node, positionType);
+}
+YGPositionType YGNodeStyleGetPositionType(const YGNodeRef node) {
+ return StyleProp<YGPositionType, &YGStyle::positionType>::get(node);
+}
+
+void YGNodeStyleSetFlexWrap(const YGNodeRef node, const YGWrap flexWrap) {
+ StyleProp<YGWrap, &YGStyle::flexWrap>::set(node, flexWrap);
+}
+YGWrap YGNodeStyleGetFlexWrap(const YGNodeRef node) {
+ return StyleProp<YGWrap, &YGStyle::flexWrap>::get(node);
+}
+
+void YGNodeStyleSetOverflow(const YGNodeRef node, const YGOverflow overflow) {
+ StyleProp<YGOverflow, &YGStyle::overflow>::set(node, overflow);
+}
+YGOverflow YGNodeStyleGetOverflow(const YGNodeRef node) {
+ return StyleProp<YGOverflow, &YGStyle::overflow>::get(node);
+}
+
+void YGNodeStyleSetDisplay(const YGNodeRef node, const YGDisplay display) {
+ StyleProp<YGDisplay, &YGStyle::display>::set(node, display);
+}
+YGDisplay YGNodeStyleGetDisplay(const YGNodeRef node) {
+ return StyleProp<YGDisplay, &YGStyle::display>::get(node);
+}
+
+// TODO(T26792433): Change the API to accept YGFloatOptional.
+void YGNodeStyleSetFlex(const YGNodeRef node, const float flex) {
+ if (node->getStyle().flex != flex) {
+ node->getStyle().flex =
+ YGFloatIsUndefined(flex) ? YGFloatOptional() : YGFloatOptional(flex);
+ node->markDirtyAndPropogate();
+ }
+}
+
+// TODO(T26792433): Change the API to accept YGFloatOptional.
+float YGNodeStyleGetFlex(const YGNodeRef node) {
+ return node->getStyle().flex.isUndefined() ? YGUndefined
+ : node->getStyle().flex.getValue();
+}
+
+// TODO(T26792433): Change the API to accept YGFloatOptional.
+void YGNodeStyleSetFlexGrow(const YGNodeRef node, const float flexGrow) {
+ if (node->getStyle().flexGrow != flexGrow) {
+ node->getStyle().flexGrow = YGFloatIsUndefined(flexGrow)
+ ? YGFloatOptional()
+ : YGFloatOptional(flexGrow);
+ node->markDirtyAndPropogate();
+ }
+}
+
+// TODO(T26792433): Change the API to accept YGFloatOptional.
+void YGNodeStyleSetFlexShrink(const YGNodeRef node, const float flexShrink) {
+ if (node->getStyle().flexShrink != flexShrink) {
+ node->getStyle().flexShrink = YGFloatIsUndefined(flexShrink)
+ ? YGFloatOptional()
+ : YGFloatOptional(flexShrink);
+ node->markDirtyAndPropogate();
+ }
+}
+
+YGValue YGNodeStyleGetFlexBasis(const YGNodeRef node) {
+ YGValue flexBasis = node->getStyle().flexBasis;
+ if (flexBasis.unit == YGUnitUndefined || flexBasis.unit == YGUnitAuto) {
+ // TODO(T26792433): Get rid off the use of YGUndefined at client side
+ flexBasis.value = YGUndefined;
+ }
+ return flexBasis;
+}
+
+void YGNodeStyleSetFlexBasis(const YGNodeRef node, const float flexBasis) {
+ YGValue value = {
+ YGFloatSanitize(flexBasis),
+ YGFloatIsUndefined(flexBasis) ? YGUnitUndefined : YGUnitPoint,
+ };
+ if ((node->getStyle().flexBasis.value != value.value &&
+ value.unit != YGUnitUndefined) ||
+ node->getStyle().flexBasis.unit != value.unit) {
+ node->getStyle().flexBasis = value;
+ node->markDirtyAndPropogate();
+ }
+}
+
+void YGNodeStyleSetFlexBasisPercent(
+ const YGNodeRef node,
+ const float flexBasisPercent) {
+ if (node->getStyle().flexBasis.value != flexBasisPercent ||
+ node->getStyle().flexBasis.unit != YGUnitPercent) {
+ node->getStyle().flexBasis = YGFloatIsUndefined(flexBasisPercent)
+ ? YGValue{0, YGUnitAuto}
+ : YGValue{flexBasisPercent, YGUnitPercent};
+ node->markDirtyAndPropogate();
+ }
+}
+
+void YGNodeStyleSetFlexBasisAuto(const YGNodeRef node) {
+ if (node->getStyle().flexBasis.unit != YGUnitAuto) {
+ node->getStyle().flexBasis = {0, YGUnitAuto};
+ node->markDirtyAndPropogate();
+ }
+}
+
+YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Position, position, position);
+YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Margin, margin, margin);
+YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Margin, margin);
+YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Padding, padding, padding);
+
+// TODO(T26792433): Change the API to accept YGFloatOptional.
+void YGNodeStyleSetBorder(
+ const YGNodeRef node,
+ const YGEdge edge,
+ const float border) {
+ YGValue value = {
+ YGFloatSanitize(border),
+ YGFloatIsUndefined(border) ? YGUnitUndefined : YGUnitPoint,
+ };
+ if ((node->getStyle().border[edge].value != value.value &&
+ value.unit != YGUnitUndefined) ||
+ node->getStyle().border[edge].unit != value.unit) {
+ node->getStyle().border[edge] = value;
+ node->markDirtyAndPropogate();
+ }
+}
+
+float YGNodeStyleGetBorder(const YGNodeRef node, const YGEdge edge) {
+ if (node->getStyle().border[edge].unit == YGUnitUndefined ||
+ node->getStyle().border[edge].unit == YGUnitAuto) {
+ // TODO(T26792433): Rather than returning YGUndefined, change the api to
+ // return YGFloatOptional.
+ return YGUndefined;
+ }
+
+ return node->getStyle().border[edge].value;
+}
+
+// Yoga specific properties, not compatible with flexbox specification
+
+// TODO(T26792433): Change the API to accept YGFloatOptional.
+float YGNodeStyleGetAspectRatio(const YGNodeRef node) {
+ const YGFloatOptional op = node->getStyle().aspectRatio;
+ return op.isUndefined() ? YGUndefined : op.getValue();
+}
+
+// TODO(T26792433): Change the API to accept YGFloatOptional.
+void YGNodeStyleSetAspectRatio(const YGNodeRef node, const float aspectRatio) {
+ if (node->getStyle().aspectRatio != aspectRatio) {
+ node->getStyle().aspectRatio = YGFloatOptional(aspectRatio);
+ node->markDirtyAndPropogate();
+ }
+}
+
+YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(
+ YGValue,
+ Width,
+ width,
+ dimensions[YGDimensionWidth]);
+YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(
+ YGValue,
+ Height,
+ height,
+ dimensions[YGDimensionHeight]);
+
+void YGNodeStyleSetMinWidth(const YGNodeRef node, const float minWidth) {
+ DimensionProp<&YGStyle::minDimensions>::set<YGDimensionWidth, YGUnitPoint>(
+ node, minWidth);
+}
+void YGNodeStyleSetMinWidthPercent(const YGNodeRef node, const float minWidth) {
+ DimensionProp<&YGStyle::minDimensions>::set<YGDimensionWidth, YGUnitPercent>(
+ node, minWidth);
+}
+YGValue YGNodeStyleGetMinWidth(const YGNodeRef node) {
+ return DimensionProp<&YGStyle::minDimensions>::get<YGDimensionWidth>(node);
+};
+
+void YGNodeStyleSetMinHeight(const YGNodeRef node, const float minHeight) {
+ DimensionProp<&YGStyle::minDimensions>::set<YGDimensionHeight, YGUnitPoint>(
+ node, minHeight);
+}
+void YGNodeStyleSetMinHeightPercent(
+ const YGNodeRef node,
+ const float minHeight) {
+ DimensionProp<&YGStyle::minDimensions>::set<YGDimensionHeight, YGUnitPercent>(
+ node, minHeight);
+}
+YGValue YGNodeStyleGetMinHeight(const YGNodeRef node) {
+ return DimensionProp<&YGStyle::minDimensions>::get<YGDimensionHeight>(node);
+};
+
+void YGNodeStyleSetMaxWidth(const YGNodeRef node, const float maxWidth) {
+ DimensionProp<&YGStyle::maxDimensions>::set<YGDimensionWidth, YGUnitPoint>(
+ node, maxWidth);
+}
+void YGNodeStyleSetMaxWidthPercent(const YGNodeRef node, const float maxWidth) {
+ DimensionProp<&YGStyle::maxDimensions>::set<YGDimensionWidth, YGUnitPercent>(
+ node, maxWidth);
+}
+YGValue YGNodeStyleGetMaxWidth(const YGNodeRef node) {
+ return DimensionProp<&YGStyle::maxDimensions>::get<YGDimensionWidth>(node);
+};
+
+void YGNodeStyleSetMaxHeight(const YGNodeRef node, const float maxHeight) {
+ DimensionProp<&YGStyle::maxDimensions>::set<YGDimensionHeight, YGUnitPoint>(
+ node, maxHeight);
+}
+void YGNodeStyleSetMaxHeightPercent(
+ const YGNodeRef node,
+ const float maxHeight) {
+ DimensionProp<&YGStyle::maxDimensions>::set<YGDimensionHeight, YGUnitPercent>(
+ node, maxHeight);
+}
+YGValue YGNodeStyleGetMaxHeight(const YGNodeRef node) {
+ return DimensionProp<&YGStyle::maxDimensions>::get<YGDimensionHeight>(node);
+};
+
+YG_NODE_LAYOUT_PROPERTY_IMPL(float, Left, position[YGEdgeLeft]);
+YG_NODE_LAYOUT_PROPERTY_IMPL(float, Top, position[YGEdgeTop]);
+YG_NODE_LAYOUT_PROPERTY_IMPL(float, Right, position[YGEdgeRight]);
+YG_NODE_LAYOUT_PROPERTY_IMPL(float, Bottom, position[YGEdgeBottom]);
+YG_NODE_LAYOUT_PROPERTY_IMPL(float, Width, dimensions[YGDimensionWidth]);
+YG_NODE_LAYOUT_PROPERTY_IMPL(float, Height, dimensions[YGDimensionHeight]);
+YG_NODE_LAYOUT_PROPERTY_IMPL(YGDirection, Direction, direction);
+YG_NODE_LAYOUT_PROPERTY_IMPL(bool, HadOverflow, hadOverflow);
+
+YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Margin, margin);
+YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Border, border);
+YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Padding, padding);
+
+bool YGNodeLayoutGetDidLegacyStretchFlagAffectLayout(const YGNodeRef node) {
+ return node->getLayout().doesLegacyStretchFlagAffectsLayout;
+}
+
+uint32_t gCurrentGenerationCount = 0;
+
+bool YGLayoutNodeInternal(
+ const YGNodeRef node,
+ const float availableWidth,
+ const float availableHeight,
+ const YGDirection ownerDirection,
+ const YGMeasureMode widthMeasureMode,
+ const YGMeasureMode heightMeasureMode,
+ const float ownerWidth,
+ const float ownerHeight,
+ const bool performLayout,
+ const char* reason,
+ const YGConfigRef config);
+
+static void YGNodePrintInternal(
+ const YGNodeRef node,
+ const YGPrintOptions options) {
+ std::string str;
+ facebook::yoga::YGNodeToString(&str, node, options, 0);
+ YGLog(node, YGLogLevelDebug, str.c_str());
+}
+
+void YGNodePrint(const YGNodeRef node, const YGPrintOptions options) {
+ YGNodePrintInternal(node, options);
+}
+
+const std::array<YGEdge, 4> leading = {
+ {YGEdgeTop, YGEdgeBottom, YGEdgeLeft, YGEdgeRight}};
+
+const std::array<YGEdge, 4> trailing = {
+ {YGEdgeBottom, YGEdgeTop, YGEdgeRight, YGEdgeLeft}};
+static const std::array<YGEdge, 4> pos = {{
+ YGEdgeTop,
+ YGEdgeBottom,
+ YGEdgeLeft,
+ YGEdgeRight,
+}};
+
+static const std::array<YGDimension, 4> dim = {
+ {YGDimensionHeight, YGDimensionHeight, YGDimensionWidth, YGDimensionWidth}};
+
+static inline float YGNodePaddingAndBorderForAxis(
+ const YGNodeRef node,
+ const YGFlexDirection axis,
+ const float widthSize) {
+ return YGUnwrapFloatOptional(
+ node->getLeadingPaddingAndBorder(axis, widthSize) +
+ node->getTrailingPaddingAndBorder(axis, widthSize));
+}
+
+static inline YGAlign YGNodeAlignItem(
+ const YGNodeRef node,
+ const YGNodeRef child) {
+ const YGAlign align = child->getStyle().alignSelf == YGAlignAuto
+ ? node->getStyle().alignItems
+ : child->getStyle().alignSelf;
+ if (align == YGAlignBaseline &&
+ YGFlexDirectionIsColumn(node->getStyle().flexDirection)) {
+ return YGAlignFlexStart;
+ }
+ return align;
+}
+
+static float YGBaseline(const YGNodeRef node) {
+ if (node->getBaseline() != nullptr) {
+ const float baseline = node->getBaseline()(
+ node,
+ node->getLayout().measuredDimensions[YGDimensionWidth],
+ node->getLayout().measuredDimensions[YGDimensionHeight]);
+ YGAssertWithNode(
+ node,
+ !YGFloatIsUndefined(baseline),
+ "Expect custom baseline function to not return NaN");
+ return baseline;
+ }
+
+ YGNodeRef baselineChild = nullptr;
+ const uint32_t childCount = YGNodeGetChildCount(node);
+ for (uint32_t i = 0; i < childCount; i++) {
+ const YGNodeRef child = YGNodeGetChild(node, i);
+ if (child->getLineIndex() > 0) {
+ break;
+ }
+ if (child->getStyle().positionType == YGPositionTypeAbsolute) {
+ continue;
+ }
+ if (YGNodeAlignItem(node, child) == YGAlignBaseline) {
+ baselineChild = child;
+ break;
+ }
+
+ if (baselineChild == nullptr) {
+ baselineChild = child;
+ }
+ }
+
+ if (baselineChild == nullptr) {
+ return node->getLayout().measuredDimensions[YGDimensionHeight];
+ }
+
+ const float baseline = YGBaseline(baselineChild);
+ return baseline + baselineChild->getLayout().position[YGEdgeTop];
+}
+
+static bool YGIsBaselineLayout(const YGNodeRef node) {
+ if (YGFlexDirectionIsColumn(node->getStyle().flexDirection)) {
+ return false;
+ }
+ if (node->getStyle().alignItems == YGAlignBaseline) {
+ return true;
+ }
+ const uint32_t childCount = YGNodeGetChildCount(node);
+ for (uint32_t i = 0; i < childCount; i++) {
+ const YGNodeRef child = YGNodeGetChild(node, i);
+ if (child->getStyle().positionType == YGPositionTypeRelative &&
+ child->getStyle().alignSelf == YGAlignBaseline) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static inline float YGNodeDimWithMargin(
+ const YGNodeRef node,
+ const YGFlexDirection axis,
+ const float widthSize) {
+ return node->getLayout().measuredDimensions[dim[axis]] +
+ YGUnwrapFloatOptional(
+ node->getLeadingMargin(axis, widthSize) +
+ node->getTrailingMargin(axis, widthSize));
+}
+
+static inline bool YGNodeIsStyleDimDefined(
+ const YGNodeRef node,
+ const YGFlexDirection axis,
+ const float ownerSize) {
+ bool isUndefined =
+ YGFloatIsUndefined(node->getResolvedDimension(dim[axis]).value);
+ return !(
+ node->getResolvedDimension(dim[axis]).unit == YGUnitAuto ||
+ node->getResolvedDimension(dim[axis]).unit == YGUnitUndefined ||
+ (node->getResolvedDimension(dim[axis]).unit == YGUnitPoint &&
+ !isUndefined && node->getResolvedDimension(dim[axis]).value < 0.0f) ||
+ (node->getResolvedDimension(dim[axis]).unit == YGUnitPercent &&
+ !isUndefined &&
+ (node->getResolvedDimension(dim[axis]).value < 0.0f ||
+ YGFloatIsUndefined(ownerSize))));
+}
+
+static inline bool YGNodeIsLayoutDimDefined(
+ const YGNodeRef node,
+ const YGFlexDirection axis) {
+ const float value = node->getLayout().measuredDimensions[dim[axis]];
+ return !YGFloatIsUndefined(value) && value >= 0.0f;
+}
+
+static YGFloatOptional YGNodeBoundAxisWithinMinAndMax(
+ const YGNodeRef node,
+ const YGFlexDirection& axis,
+ const float& value,
+ const float& axisSize) {
+ YGFloatOptional min;
+ YGFloatOptional max;
+
+ if (YGFlexDirectionIsColumn(axis)) {
+ min = YGResolveValue(
+ node->getStyle().minDimensions[YGDimensionHeight], axisSize);
+ max = YGResolveValue(
+ node->getStyle().maxDimensions[YGDimensionHeight], axisSize);
+ } else if (YGFlexDirectionIsRow(axis)) {
+ min = YGResolveValue(
+ node->getStyle().minDimensions[YGDimensionWidth], axisSize);
+ max = YGResolveValue(
+ node->getStyle().maxDimensions[YGDimensionWidth], axisSize);
+ }
+
+ if (!max.isUndefined() && max.getValue() >= 0 && value > max.getValue()) {
+ return max;
+ }
+
+ if (!min.isUndefined() && min.getValue() >= 0 && value < min.getValue()) {
+ return min;
+ }
+
+ return YGFloatOptional(value);
+}
+
+// Like YGNodeBoundAxisWithinMinAndMax but also ensures that the value doesn't
+// go below the padding and border amount.
+static inline float YGNodeBoundAxis(
+ const YGNodeRef node,
+ const YGFlexDirection axis,
+ const float value,
+ const float axisSize,
+ const float widthSize) {
+ return YGFloatMax(
+ YGUnwrapFloatOptional(
+ YGNodeBoundAxisWithinMinAndMax(node, axis, value, axisSize)),
+ YGNodePaddingAndBorderForAxis(node, axis, widthSize));
+}
+
+static void YGNodeSetChildTrailingPosition(
+ const YGNodeRef node,
+ const YGNodeRef child,
+ const YGFlexDirection axis) {
+ const float size = child->getLayout().measuredDimensions[dim[axis]];
+ child->setLayoutPosition(
+ node->getLayout().measuredDimensions[dim[axis]] - size -
+ child->getLayout().position[pos[axis]],
+ trailing[axis]);
+}
+
+static void YGConstrainMaxSizeForMode(
+ const YGNodeRef node,
+ const enum YGFlexDirection axis,
+ const float ownerAxisSize,
+ const float ownerWidth,
+ YGMeasureMode* mode,
+ float* size) {
+ const YGFloatOptional maxSize =
+ YGResolveValue(node->getStyle().maxDimensions[dim[axis]], ownerAxisSize) +
+ YGFloatOptional(node->getMarginForAxis(axis, ownerWidth));
+ switch (*mode) {
+ case YGMeasureModeExactly:
+ case YGMeasureModeAtMost:
+ *size = (maxSize.isUndefined() || *size < maxSize.getValue())
+ ? *size
+ : maxSize.getValue();
+ break;
+ case YGMeasureModeUndefined:
+ if (!maxSize.isUndefined()) {
+ *mode = YGMeasureModeAtMost;
+ *size = maxSize.getValue();
+ }
+ break;
+ }
+}
+
+static void YGNodeComputeFlexBasisForChild(
+ const YGNodeRef node,
+ const YGNodeRef child,
+ const float width,
+ const YGMeasureMode widthMode,
+ const float height,
+ const float ownerWidth,
+ const float ownerHeight,
+ const YGMeasureMode heightMode,
+ const YGDirection direction,
+ const YGConfigRef config) {
+ const YGFlexDirection mainAxis =
+ YGResolveFlexDirection(node->getStyle().flexDirection, direction);
+ const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
+ const float mainAxisSize = isMainAxisRow ? width : height;
+ const float mainAxisownerSize = isMainAxisRow ? ownerWidth : ownerHeight;
+
+ float childWidth;
+ float childHeight;
+ YGMeasureMode childWidthMeasureMode;
+ YGMeasureMode childHeightMeasureMode;
+
+ const YGFloatOptional resolvedFlexBasis =
+ YGResolveValue(child->resolveFlexBasisPtr(), mainAxisownerSize);
+ const bool isRowStyleDimDefined =
+ YGNodeIsStyleDimDefined(child, YGFlexDirectionRow, ownerWidth);
+ const bool isColumnStyleDimDefined =
+ YGNodeIsStyleDimDefined(child, YGFlexDirectionColumn, ownerHeight);
+
+ if (!resolvedFlexBasis.isUndefined() && !YGFloatIsUndefined(mainAxisSize)) {
+ if (child->getLayout().computedFlexBasis.isUndefined() ||
+ (YGConfigIsExperimentalFeatureEnabled(
+ child->getConfig(), YGExperimentalFeatureWebFlexBasis) &&
+ child->getLayout().computedFlexBasisGeneration !=
+ gCurrentGenerationCount)) {
+ const YGFloatOptional& paddingAndBorder = YGFloatOptional(
+ YGNodePaddingAndBorderForAxis(child, mainAxis, ownerWidth));
+ child->setLayoutComputedFlexBasis(
+ YGFloatOptionalMax(resolvedFlexBasis, paddingAndBorder));
+ }
+ } else if (isMainAxisRow && isRowStyleDimDefined) {
+ // The width is definite, so use that as the flex basis.
+ const YGFloatOptional& paddingAndBorder = YGFloatOptional(
+ YGNodePaddingAndBorderForAxis(child, YGFlexDirectionRow, ownerWidth));
+
+ child->setLayoutComputedFlexBasis(YGFloatOptionalMax(
+ YGResolveValue(
+ child->getResolvedDimension(YGDimensionWidth), ownerWidth),
+ paddingAndBorder));
+ } else if (!isMainAxisRow && isColumnStyleDimDefined) {
+ // The height is definite, so use that as the flex basis.
+ const YGFloatOptional& paddingAndBorder =
+ YGFloatOptional(YGNodePaddingAndBorderForAxis(
+ child, YGFlexDirectionColumn, ownerWidth));
+ child->setLayoutComputedFlexBasis(YGFloatOptionalMax(
+ YGResolveValue(
+ child->getResolvedDimension(YGDimensionHeight), ownerHeight),
+ paddingAndBorder));
+ } else {
+ // Compute the flex basis and hypothetical main size (i.e. the clamped
+ // flex basis).
+ childWidth = YGUndefined;
+ childHeight = YGUndefined;
+ childWidthMeasureMode = YGMeasureModeUndefined;
+ childHeightMeasureMode = YGMeasureModeUndefined;
+
+ auto marginRow = YGUnwrapFloatOptional(
+ child->getMarginForAxis(YGFlexDirectionRow, ownerWidth));
+ auto marginColumn = YGUnwrapFloatOptional(
+ child->getMarginForAxis(YGFlexDirectionColumn, ownerWidth));
+
+ if (isRowStyleDimDefined) {
+ childWidth =
+ YGUnwrapFloatOptional(YGResolveValue(
+ child->getResolvedDimension(YGDimensionWidth), ownerWidth)) +
+ marginRow;
+ childWidthMeasureMode = YGMeasureModeExactly;
+ }
+ if (isColumnStyleDimDefined) {
+ childHeight =
+ YGUnwrapFloatOptional(YGResolveValue(
+ child->getResolvedDimension(YGDimensionHeight), ownerHeight)) +
+ marginColumn;
+ childHeightMeasureMode = YGMeasureModeExactly;
+ }
+
+ // The W3C spec doesn't say anything about the 'overflow' property,
+ // but all major browsers appear to implement the following logic.
+ if ((!isMainAxisRow && node->getStyle().overflow == YGOverflowScroll) ||
+ node->getStyle().overflow != YGOverflowScroll) {
+ if (YGFloatIsUndefined(childWidth) && !YGFloatIsUndefined(width)) {
+ childWidth = width;
+ childWidthMeasureMode = YGMeasureModeAtMost;
+ }
+ }
+
+ if ((isMainAxisRow && node->getStyle().overflow == YGOverflowScroll) ||
+ node->getStyle().overflow != YGOverflowScroll) {
+ if (YGFloatIsUndefined(childHeight) && !YGFloatIsUndefined(height)) {
+ childHeight = height;
+ childHeightMeasureMode = YGMeasureModeAtMost;
+ }
+ }
+
+ if (!child->getStyle().aspectRatio.isUndefined()) {
+ if (!isMainAxisRow && childWidthMeasureMode == YGMeasureModeExactly) {
+ childHeight = marginColumn +
+ (childWidth - marginRow) / child->getStyle().aspectRatio.getValue();
+ childHeightMeasureMode = YGMeasureModeExactly;
+ } else if (
+ isMainAxisRow && childHeightMeasureMode == YGMeasureModeExactly) {
+ childWidth = marginRow +
+ (childHeight - marginColumn) *
+ child->getStyle().aspectRatio.getValue();
+ childWidthMeasureMode = YGMeasureModeExactly;
+ }
+ }
+
+ // If child has no defined size in the cross axis and is set to stretch,
+ // set the cross
+ // axis to be measured exactly with the available inner width
+
+ const bool hasExactWidth =
+ !YGFloatIsUndefined(width) && widthMode == YGMeasureModeExactly;
+ const bool childWidthStretch =
+ YGNodeAlignItem(node, child) == YGAlignStretch &&
+ childWidthMeasureMode != YGMeasureModeExactly;
+ if (!isMainAxisRow && !isRowStyleDimDefined && hasExactWidth &&
+ childWidthStretch) {
+ childWidth = width;
+ childWidthMeasureMode = YGMeasureModeExactly;
+ if (!child->getStyle().aspectRatio.isUndefined()) {
+ childHeight =
+ (childWidth - marginRow) / child->getStyle().aspectRatio.getValue();
+ childHeightMeasureMode = YGMeasureModeExactly;
+ }
+ }
+
+ const bool hasExactHeight =
+ !YGFloatIsUndefined(height) && heightMode == YGMeasureModeExactly;
+ const bool childHeightStretch =
+ YGNodeAlignItem(node, child) == YGAlignStretch &&
+ childHeightMeasureMode != YGMeasureModeExactly;
+ if (isMainAxisRow && !isColumnStyleDimDefined && hasExactHeight &&
+ childHeightStretch) {
+ childHeight = height;
+ childHeightMeasureMode = YGMeasureModeExactly;
+
+ if (!child->getStyle().aspectRatio.isUndefined()) {
+ childWidth = (childHeight - marginColumn) *
+ child->getStyle().aspectRatio.getValue();
+ childWidthMeasureMode = YGMeasureModeExactly;
+ }
+ }
+
+ YGConstrainMaxSizeForMode(
+ child,
+ YGFlexDirectionRow,
+ ownerWidth,
+ ownerWidth,
+ &childWidthMeasureMode,
+ &childWidth);
+ YGConstrainMaxSizeForMode(
+ child,
+ YGFlexDirectionColumn,
+ ownerHeight,
+ ownerWidth,
+ &childHeightMeasureMode,
+ &childHeight);
+
+ // Measure the child
+ YGLayoutNodeInternal(
+ child,
+ childWidth,
+ childHeight,
+ direction,
+ childWidthMeasureMode,
+ childHeightMeasureMode,
+ ownerWidth,
+ ownerHeight,
+ false,
+ "measure",
+ config);
+
+ child->setLayoutComputedFlexBasis(YGFloatOptional(YGFloatMax(
+ child->getLayout().measuredDimensions[dim[mainAxis]],
+ YGNodePaddingAndBorderForAxis(child, mainAxis, ownerWidth))));
+ }
+ child->setLayoutComputedFlexBasisGeneration(gCurrentGenerationCount);
+}
+
+static void YGNodeAbsoluteLayoutChild(
+ const YGNodeRef node,
+ const YGNodeRef child,
+ const float width,
+ const YGMeasureMode widthMode,
+ const float height,
+ const YGDirection direction,
+ const YGConfigRef config) {
+ const YGFlexDirection mainAxis =
+ YGResolveFlexDirection(node->getStyle().flexDirection, direction);
+ const YGFlexDirection crossAxis = YGFlexDirectionCross(mainAxis, direction);
+ const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
+
+ float childWidth = YGUndefined;
+ float childHeight = YGUndefined;
+ YGMeasureMode childWidthMeasureMode = YGMeasureModeUndefined;
+ YGMeasureMode childHeightMeasureMode = YGMeasureModeUndefined;
+
+ auto marginRow =
+ YGUnwrapFloatOptional(child->getMarginForAxis(YGFlexDirectionRow, width));
+ auto marginColumn = YGUnwrapFloatOptional(
+ child->getMarginForAxis(YGFlexDirectionColumn, width));
+
+ if (YGNodeIsStyleDimDefined(child, YGFlexDirectionRow, width)) {
+ childWidth = YGUnwrapFloatOptional(YGResolveValue(
+ child->getResolvedDimension(YGDimensionWidth), width)) +
+ marginRow;
+ } else {
+ // If the child doesn't have a specified width, compute the width based
+ // on the left/right
+ // offsets if they're defined.
+ if (child->isLeadingPositionDefined(YGFlexDirectionRow) &&
+ child->isTrailingPosDefined(YGFlexDirectionRow)) {
+ childWidth = node->getLayout().measuredDimensions[YGDimensionWidth] -
+ (node->getLeadingBorder(YGFlexDirectionRow) +
+ node->getTrailingBorder(YGFlexDirectionRow)) -
+ YGUnwrapFloatOptional(
+ child->getLeadingPosition(YGFlexDirectionRow, width) +
+ child->getTrailingPosition(YGFlexDirectionRow, width));
+ childWidth =
+ YGNodeBoundAxis(child, YGFlexDirectionRow, childWidth, width, width);
+ }
+ }
+
+ if (YGNodeIsStyleDimDefined(child, YGFlexDirectionColumn, height)) {
+ childHeight = YGUnwrapFloatOptional(YGResolveValue(
+ child->getResolvedDimension(YGDimensionHeight), height)) +
+ marginColumn;
+ } else {
+ // If the child doesn't have a specified height, compute the height
+ // based on the top/bottom
+ // offsets if they're defined.
+ if (child->isLeadingPositionDefined(YGFlexDirectionColumn) &&
+ child->isTrailingPosDefined(YGFlexDirectionColumn)) {
+ childHeight =
+ node->getLayout().measuredDimensions[YGDimensionHeight] -
+ (node->getLeadingBorder(YGFlexDirectionColumn) +
+ node->getTrailingBorder(YGFlexDirectionColumn)) -
+ YGUnwrapFloatOptional(
+ child->getLeadingPosition(YGFlexDirectionColumn, height) +
+ child->getTrailingPosition(YGFlexDirectionColumn, height));
+ childHeight = YGNodeBoundAxis(
+ child, YGFlexDirectionColumn, childHeight, height, width);
+ }
+ }
+
+ // Exactly one dimension needs to be defined for us to be able to do aspect
+ // ratio calculation. One dimension being the anchor and the other being
+ // flexible.
+ if (YGFloatIsUndefined(childWidth) ^ YGFloatIsUndefined(childHeight)) {
+ if (!child->getStyle().aspectRatio.isUndefined()) {
+ if (YGFloatIsUndefined(childWidth)) {
+ childWidth = marginRow +
+ (childHeight - marginColumn) *
+ child->getStyle().aspectRatio.getValue();
+ } else if (YGFloatIsUndefined(childHeight)) {
+ childHeight = marginColumn +
+ (childWidth - marginRow) / child->getStyle().aspectRatio.getValue();
+ }
+ }
+ }
+
+ // If we're still missing one or the other dimension, measure the content.
+ if (YGFloatIsUndefined(childWidth) || YGFloatIsUndefined(childHeight)) {
+ childWidthMeasureMode = YGFloatIsUndefined(childWidth)
+ ? YGMeasureModeUndefined
+ : YGMeasureModeExactly;
+ childHeightMeasureMode = YGFloatIsUndefined(childHeight)
+ ? YGMeasureModeUndefined
+ : YGMeasureModeExactly;
+
+ // If the size of the owner is defined then try to constrain the absolute
+ // child to that size as well. This allows text within the absolute child to
+ // wrap to the size of its owner. This is the same behavior as many browsers
+ // implement.
+ if (!isMainAxisRow && YGFloatIsUndefined(childWidth) &&
+ widthMode != YGMeasureModeUndefined && !YGFloatIsUndefined(width) &&
+ width > 0) {
+ childWidth = width;
+ childWidthMeasureMode = YGMeasureModeAtMost;
+ }
+
+ YGLayoutNodeInternal(
+ child,
+ childWidth,
+ childHeight,
+ direction,
+ childWidthMeasureMode,
+ childHeightMeasureMode,
+ childWidth,
+ childHeight,
+ false,
+ "abs-measure",
+ config);
+ childWidth = child->getLayout().measuredDimensions[YGDimensionWidth] +
+ YGUnwrapFloatOptional(
+ child->getMarginForAxis(YGFlexDirectionRow, width));
+ childHeight = child->getLayout().measuredDimensions[YGDimensionHeight] +
+ YGUnwrapFloatOptional(
+ child->getMarginForAxis(YGFlexDirectionColumn, width));
+ }
+
+ YGLayoutNodeInternal(
+ child,
+ childWidth,
+ childHeight,
+ direction,
+ YGMeasureModeExactly,
+ YGMeasureModeExactly,
+ childWidth,
+ childHeight,
+ true,
+ "abs-layout",
+ config);
+
+ if (child->isTrailingPosDefined(mainAxis) &&
+ !child->isLeadingPositionDefined(mainAxis)) {
+ child->setLayoutPosition(
+ node->getLayout().measuredDimensions[dim[mainAxis]] -
+ child->getLayout().measuredDimensions[dim[mainAxis]] -
+ node->getTrailingBorder(mainAxis) -
+ YGUnwrapFloatOptional(child->getTrailingMargin(mainAxis, width)) -
+ YGUnwrapFloatOptional(child->getTrailingPosition(
+ mainAxis, isMainAxisRow ? width : height)),
+ leading[mainAxis]);
+ } else if (
+ !child->isLeadingPositionDefined(mainAxis) &&
+ node->getStyle().justifyContent == YGJustifyCenter) {
+ child->setLayoutPosition(
+ (node->getLayout().measuredDimensions[dim[mainAxis]] -
+ child->getLayout().measuredDimensions[dim[mainAxis]]) /
+ 2.0f,
+ leading[mainAxis]);
+ } else if (
+ !child->isLeadingPositionDefined(mainAxis) &&
+ node->getStyle().justifyContent == YGJustifyFlexEnd) {
+ child->setLayoutPosition(
+ (node->getLayout().measuredDimensions[dim[mainAxis]] -
+ child->getLayout().measuredDimensions[dim[mainAxis]]),
+ leading[mainAxis]);
+ }
+
+ if (child->isTrailingPosDefined(crossAxis) &&
+ !child->isLeadingPositionDefined(crossAxis)) {
+ child->setLayoutPosition(
+ node->getLayout().measuredDimensions[dim[crossAxis]] -
+ child->getLayout().measuredDimensions[dim[crossAxis]] -
+ node->getTrailingBorder(crossAxis) -
+ YGUnwrapFloatOptional(child->getTrailingMargin(crossAxis, width)) -
+ YGUnwrapFloatOptional(child->getTrailingPosition(
+ crossAxis, isMainAxisRow ? height : width)),
+ leading[crossAxis]);
+
+ } else if (
+ !child->isLeadingPositionDefined(crossAxis) &&
+ YGNodeAlignItem(node, child) == YGAlignCenter) {
+ child->setLayoutPosition(
+ (node->getLayout().measuredDimensions[dim[crossAxis]] -
+ child->getLayout().measuredDimensions[dim[crossAxis]]) /
+ 2.0f,
+ leading[crossAxis]);
+ } else if (
+ !child->isLeadingPositionDefined(crossAxis) &&
+ ((YGNodeAlignItem(node, child) == YGAlignFlexEnd) ^
+ (node->getStyle().flexWrap == YGWrapWrapReverse))) {
+ child->setLayoutPosition(
+ (node->getLayout().measuredDimensions[dim[crossAxis]] -
+ child->getLayout().measuredDimensions[dim[crossAxis]]),
+ leading[crossAxis]);
+ }
+}
+
+static void YGNodeWithMeasureFuncSetMeasuredDimensions(
+ const YGNodeRef node,
+ const float availableWidth,
+ const float availableHeight,
+ const YGMeasureMode widthMeasureMode,
+ const YGMeasureMode heightMeasureMode,
+ const float ownerWidth,
+ const float ownerHeight) {
+ YGAssertWithNode(
+ node,
+ node->getMeasure() != nullptr,
+ "Expected node to have custom measure function");
+
+ const float paddingAndBorderAxisRow =
+ YGNodePaddingAndBorderForAxis(node, YGFlexDirectionRow, availableWidth);
+ const float paddingAndBorderAxisColumn = YGNodePaddingAndBorderForAxis(
+ node, YGFlexDirectionColumn, availableWidth);
+ const float marginAxisRow = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionRow, availableWidth));
+ const float marginAxisColumn = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionColumn, availableWidth));
+
+ // We want to make sure we don't call measure with negative size
+ const float innerWidth = YGFloatIsUndefined(availableWidth)
+ ? availableWidth
+ : YGFloatMax(0, availableWidth - marginAxisRow - paddingAndBorderAxisRow);
+ const float innerHeight = YGFloatIsUndefined(availableHeight)
+ ? availableHeight
+ : YGFloatMax(
+ 0, availableHeight - marginAxisColumn - paddingAndBorderAxisColumn);
+
+ if (widthMeasureMode == YGMeasureModeExactly &&
+ heightMeasureMode == YGMeasureModeExactly) {
+ // Don't bother sizing the text if both dimensions are already defined.
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionRow,
+ availableWidth - marginAxisRow,
+ ownerWidth,
+ ownerWidth),
+ YGDimensionWidth);
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionColumn,
+ availableHeight - marginAxisColumn,
+ ownerHeight,
+ ownerWidth),
+ YGDimensionHeight);
+ } else {
+ // Measure the text under the current constraints.
+ const YGSize measuredSize = node->getMeasure()(
+ node, innerWidth, widthMeasureMode, innerHeight, heightMeasureMode);
+
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionRow,
+ (widthMeasureMode == YGMeasureModeUndefined ||
+ widthMeasureMode == YGMeasureModeAtMost)
+ ? measuredSize.width + paddingAndBorderAxisRow
+ : availableWidth - marginAxisRow,
+ ownerWidth,
+ ownerWidth),
+ YGDimensionWidth);
+
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionColumn,
+ (heightMeasureMode == YGMeasureModeUndefined ||
+ heightMeasureMode == YGMeasureModeAtMost)
+ ? measuredSize.height + paddingAndBorderAxisColumn
+ : availableHeight - marginAxisColumn,
+ ownerHeight,
+ ownerWidth),
+ YGDimensionHeight);
+ }
+}
+
+// For nodes with no children, use the available values if they were provided,
+// or the minimum size as indicated by the padding and border sizes.
+static void YGNodeEmptyContainerSetMeasuredDimensions(
+ const YGNodeRef node,
+ const float availableWidth,
+ const float availableHeight,
+ const YGMeasureMode widthMeasureMode,
+ const YGMeasureMode heightMeasureMode,
+ const float ownerWidth,
+ const float ownerHeight) {
+ const float paddingAndBorderAxisRow =
+ YGNodePaddingAndBorderForAxis(node, YGFlexDirectionRow, ownerWidth);
+ const float paddingAndBorderAxisColumn =
+ YGNodePaddingAndBorderForAxis(node, YGFlexDirectionColumn, ownerWidth);
+ const float marginAxisRow = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionRow, ownerWidth));
+ const float marginAxisColumn = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionColumn, ownerWidth));
+
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionRow,
+ (widthMeasureMode == YGMeasureModeUndefined ||
+ widthMeasureMode == YGMeasureModeAtMost)
+ ? paddingAndBorderAxisRow
+ : availableWidth - marginAxisRow,
+ ownerWidth,
+ ownerWidth),
+ YGDimensionWidth);
+
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionColumn,
+ (heightMeasureMode == YGMeasureModeUndefined ||
+ heightMeasureMode == YGMeasureModeAtMost)
+ ? paddingAndBorderAxisColumn
+ : availableHeight - marginAxisColumn,
+ ownerHeight,
+ ownerWidth),
+ YGDimensionHeight);
+}
+
+static bool YGNodeFixedSizeSetMeasuredDimensions(
+ const YGNodeRef node,
+ const float availableWidth,
+ const float availableHeight,
+ const YGMeasureMode widthMeasureMode,
+ const YGMeasureMode heightMeasureMode,
+ const float ownerWidth,
+ const float ownerHeight) {
+ if ((!YGFloatIsUndefined(availableWidth) &&
+ widthMeasureMode == YGMeasureModeAtMost && availableWidth <= 0.0f) ||
+ (!YGFloatIsUndefined(availableHeight) &&
+ heightMeasureMode == YGMeasureModeAtMost && availableHeight <= 0.0f) ||
+ (widthMeasureMode == YGMeasureModeExactly &&
+ heightMeasureMode == YGMeasureModeExactly)) {
+ auto marginAxisColumn = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionColumn, ownerWidth));
+ auto marginAxisRow = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionRow, ownerWidth));
+
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionRow,
+ YGFloatIsUndefined(availableWidth) ||
+ (widthMeasureMode == YGMeasureModeAtMost &&
+ availableWidth < 0.0f)
+ ? 0.0f
+ : availableWidth - marginAxisRow,
+ ownerWidth,
+ ownerWidth),
+ YGDimensionWidth);
+
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionColumn,
+ YGFloatIsUndefined(availableHeight) ||
+ (heightMeasureMode == YGMeasureModeAtMost &&
+ availableHeight < 0.0f)
+ ? 0.0f
+ : availableHeight - marginAxisColumn,
+ ownerHeight,
+ ownerWidth),
+ YGDimensionHeight);
+ return true;
+ }
+
+ return false;
+}
+
+static void YGZeroOutLayoutRecursivly(const YGNodeRef node) {
+ memset(&(node->getLayout()), 0, sizeof(YGLayout));
+ node->setHasNewLayout(true);
+ node->cloneChildrenIfNeeded();
+ const uint32_t childCount = YGNodeGetChildCount(node);
+ for (uint32_t i = 0; i < childCount; i++) {
+ const YGNodeRef child = node->getChild(i);
+ YGZeroOutLayoutRecursivly(child);
+ }
+}
+
+static float YGNodeCalculateAvailableInnerDim(
+ const YGNodeRef node,
+ YGFlexDirection axis,
+ float availableDim,
+ float ownerDim) {
+ YGFlexDirection direction =
+ YGFlexDirectionIsRow(axis) ? YGFlexDirectionRow : YGFlexDirectionColumn;
+ YGDimension dimension =
+ YGFlexDirectionIsRow(axis) ? YGDimensionWidth : YGDimensionHeight;
+
+ const float margin =
+ YGUnwrapFloatOptional(node->getMarginForAxis(direction, ownerDim));
+ const float paddingAndBorder =
+ YGNodePaddingAndBorderForAxis(node, direction, ownerDim);
+
+ float availableInnerDim = availableDim - margin - paddingAndBorder;
+ // Max dimension overrides predefined dimension value; Min dimension in turn
+ // overrides both of the above
+ if (!YGFloatIsUndefined(availableInnerDim)) {
+ // We want to make sure our available height does not violate min and max
+ // constraints
+ const YGFloatOptional minDimensionOptional =
+ YGResolveValue(node->getStyle().minDimensions[dimension], ownerDim);
+ const float minInnerDim = minDimensionOptional.isUndefined()
+ ? 0.0f
+ : minDimensionOptional.getValue() - paddingAndBorder;
+
+ const YGFloatOptional maxDimensionOptional =
+ YGResolveValue(node->getStyle().maxDimensions[dimension], ownerDim);
+
+ const float maxInnerDim = maxDimensionOptional.isUndefined()
+ ? FLT_MAX
+ : maxDimensionOptional.getValue() - paddingAndBorder;
+ availableInnerDim =
+ YGFloatMax(YGFloatMin(availableInnerDim, maxInnerDim), minInnerDim);
+ }
+
+ return availableInnerDim;
+}
+
+static void YGNodeComputeFlexBasisForChildren(
+ const YGNodeRef node,
+ const float availableInnerWidth,
+ const float availableInnerHeight,
+ YGMeasureMode widthMeasureMode,
+ YGMeasureMode heightMeasureMode,
+ YGDirection direction,
+ YGFlexDirection mainAxis,
+ const YGConfigRef config,
+ bool performLayout,
+ float& totalOuterFlexBasis) {
+ YGNodeRef singleFlexChild = nullptr;
+ YGVector children = node->getChildren();
+ YGMeasureMode measureModeMainDim =
+ YGFlexDirectionIsRow(mainAxis) ? widthMeasureMode : heightMeasureMode;
+ // If there is only one child with flexGrow + flexShrink it means we can set
+ // the computedFlexBasis to 0 instead of measuring and shrinking / flexing the
+ // child to exactly match the remaining space
+ if (measureModeMainDim == YGMeasureModeExactly) {
+ for (auto child : children) {
+ if (child->isNodeFlexible()) {
+ if (singleFlexChild != nullptr ||
+ YGFloatsEqual(child->resolveFlexGrow(), 0.0f) ||
+ YGFloatsEqual(child->resolveFlexShrink(), 0.0f)) {
+ // There is already a flexible child, or this flexible child doesn't
+ // have flexGrow and flexShrink, abort
+ singleFlexChild = nullptr;
+ break;
+ } else {
+ singleFlexChild = child;
+ }
+ }
+ }
+ }
+
+ for (auto child : children) {
+ child->resolveDimension();
+ if (child->getStyle().display == YGDisplayNone) {
+ YGZeroOutLayoutRecursivly(child);
+ child->setHasNewLayout(true);
+ child->setDirty(false);
+ continue;
+ }
+ if (performLayout) {
+ // Set the initial position (relative to the owner).
+ const YGDirection childDirection = child->resolveDirection(direction);
+ const float mainDim = YGFlexDirectionIsRow(mainAxis)
+ ? availableInnerWidth
+ : availableInnerHeight;
+ const float crossDim = YGFlexDirectionIsRow(mainAxis)
+ ? availableInnerHeight
+ : availableInnerWidth;
+ child->setPosition(
+ childDirection, mainDim, crossDim, availableInnerWidth);
+ }
+
+ if (child->getStyle().positionType == YGPositionTypeAbsolute) {
+ continue;
+ }
+ if (child == singleFlexChild) {
+ child->setLayoutComputedFlexBasisGeneration(gCurrentGenerationCount);
+ child->setLayoutComputedFlexBasis(YGFloatOptional(0));
+ } else {
+ YGNodeComputeFlexBasisForChild(
+ node,
+ child,
+ availableInnerWidth,
+ widthMeasureMode,
+ availableInnerHeight,
+ availableInnerWidth,
+ availableInnerHeight,
+ heightMeasureMode,
+ direction,
+ config);
+ }
+
+ totalOuterFlexBasis += YGUnwrapFloatOptional(
+ child->getLayout().computedFlexBasis +
+ child->getMarginForAxis(mainAxis, availableInnerWidth));
+ }
+}
+
+// This function assumes that all the children of node have their
+// computedFlexBasis properly computed(To do this use
+// YGNodeComputeFlexBasisForChildren function).
+// This function calculates YGCollectFlexItemsRowMeasurement
+static YGCollectFlexItemsRowValues YGCalculateCollectFlexItemsRowValues(
+ const YGNodeRef& node,
+ const YGDirection ownerDirection,
+ const float mainAxisownerSize,
+ const float availableInnerWidth,
+ const float availableInnerMainDim,
+ const uint32_t startOfLineIndex,
+ const uint32_t lineCount) {
+ YGCollectFlexItemsRowValues flexAlgoRowMeasurement = {};
+ flexAlgoRowMeasurement.relativeChildren.reserve(node->getChildren().size());
+
+ float sizeConsumedOnCurrentLineIncludingMinConstraint = 0;
+ const YGFlexDirection mainAxis = YGResolveFlexDirection(
+ node->getStyle().flexDirection, node->resolveDirection(ownerDirection));
+ const bool isNodeFlexWrap = node->getStyle().flexWrap != YGWrapNoWrap;
+
+ // Add items to the current line until it's full or we run out of items.
+ uint32_t endOfLineIndex = startOfLineIndex;
+ for (; endOfLineIndex < node->getChildren().size(); endOfLineIndex++) {
+ const YGNodeRef child = node->getChild(endOfLineIndex);
+ if (child->getStyle().display == YGDisplayNone ||
+ child->getStyle().positionType == YGPositionTypeAbsolute) {
+ continue;
+ }
+ child->setLineIndex(lineCount);
+ const float childMarginMainAxis = YGUnwrapFloatOptional(
+ child->getMarginForAxis(mainAxis, availableInnerWidth));
+ const float flexBasisWithMinAndMaxConstraints =
+ YGUnwrapFloatOptional(YGNodeBoundAxisWithinMinAndMax(
+ child,
+ mainAxis,
+ YGUnwrapFloatOptional(child->getLayout().computedFlexBasis),
+ mainAxisownerSize));
+
+ // If this is a multi-line flow and this item pushes us over the
+ // available size, we've
+ // hit the end of the current line. Break out of the loop and lay out
+ // the current line.
+ if (sizeConsumedOnCurrentLineIncludingMinConstraint +
+ flexBasisWithMinAndMaxConstraints + childMarginMainAxis >
+ availableInnerMainDim &&
+ isNodeFlexWrap && flexAlgoRowMeasurement.itemsOnLine > 0) {
+ break;
+ }
+
+ sizeConsumedOnCurrentLineIncludingMinConstraint +=
+ flexBasisWithMinAndMaxConstraints + childMarginMainAxis;
+ flexAlgoRowMeasurement.sizeConsumedOnCurrentLine +=
+ flexBasisWithMinAndMaxConstraints + childMarginMainAxis;
+ flexAlgoRowMeasurement.itemsOnLine++;
+
+ if (child->isNodeFlexible()) {
+ flexAlgoRowMeasurement.totalFlexGrowFactors += child->resolveFlexGrow();
+
+ // Unlike the grow factor, the shrink factor is scaled relative to the
+ // child dimension.
+ flexAlgoRowMeasurement.totalFlexShrinkScaledFactors +=
+ -child->resolveFlexShrink() *
+ YGUnwrapFloatOptional(child->getLayout().computedFlexBasis);
+ }
+
+ flexAlgoRowMeasurement.relativeChildren.push_back(child);
+ }
+
+ // The total flex factor needs to be floored to 1.
+ if (flexAlgoRowMeasurement.totalFlexGrowFactors > 0 &&
+ flexAlgoRowMeasurement.totalFlexGrowFactors < 1) {
+ flexAlgoRowMeasurement.totalFlexGrowFactors = 1;
+ }
+
+ // The total flex shrink factor needs to be floored to 1.
+ if (flexAlgoRowMeasurement.totalFlexShrinkScaledFactors > 0 &&
+ flexAlgoRowMeasurement.totalFlexShrinkScaledFactors < 1) {
+ flexAlgoRowMeasurement.totalFlexShrinkScaledFactors = 1;
+ }
+ flexAlgoRowMeasurement.endOfLineIndex = endOfLineIndex;
+ return flexAlgoRowMeasurement;
+}
+
+// It distributes the free space to the flexible items and ensures that the size
+// of the flex items abide the min and max constraints. At the end of this
+// function the child nodes would have proper size. Prior using this function
+// please ensure that YGDistributeFreeSpaceFirstPass is called.
+static float YGDistributeFreeSpaceSecondPass(
+ YGCollectFlexItemsRowValues& collectedFlexItemsValues,
+ const YGNodeRef node,
+ const YGFlexDirection mainAxis,
+ const YGFlexDirection crossAxis,
+ const float mainAxisownerSize,
+ const float availableInnerMainDim,
+ const float availableInnerCrossDim,
+ const float availableInnerWidth,
+ const float availableInnerHeight,
+ const bool flexBasisOverflows,
+ const YGMeasureMode measureModeCrossDim,
+ const bool performLayout,
+ const YGConfigRef config) {
+ float childFlexBasis = 0;
+ float flexShrinkScaledFactor = 0;
+ float flexGrowFactor = 0;
+ float deltaFreeSpace = 0;
+ const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
+ const bool isNodeFlexWrap = node->getStyle().flexWrap != YGWrapNoWrap;
+
+ for (auto currentRelativeChild : collectedFlexItemsValues.relativeChildren) {
+ childFlexBasis = YGUnwrapFloatOptional(YGNodeBoundAxisWithinMinAndMax(
+ currentRelativeChild,
+ mainAxis,
+ YGUnwrapFloatOptional(
+ currentRelativeChild->getLayout().computedFlexBasis),
+ mainAxisownerSize));
+ float updatedMainSize = childFlexBasis;
+
+ if (!YGFloatIsUndefined(collectedFlexItemsValues.remainingFreeSpace) &&
+ collectedFlexItemsValues.remainingFreeSpace < 0) {
+ flexShrinkScaledFactor =
+ -currentRelativeChild->resolveFlexShrink() * childFlexBasis;
+ // Is this child able to shrink?
+ if (flexShrinkScaledFactor != 0) {
+ float childSize;
+
+ if (!YGFloatIsUndefined(
+ collectedFlexItemsValues.totalFlexShrinkScaledFactors) &&
+ collectedFlexItemsValues.totalFlexShrinkScaledFactors == 0) {
+ childSize = childFlexBasis + flexShrinkScaledFactor;
+ } else {
+ childSize = childFlexBasis +
+ (collectedFlexItemsValues.remainingFreeSpace /
+ collectedFlexItemsValues.totalFlexShrinkScaledFactors) *
+ flexShrinkScaledFactor;
+ }
+
+ updatedMainSize = YGNodeBoundAxis(
+ currentRelativeChild,
+ mainAxis,
+ childSize,
+ availableInnerMainDim,
+ availableInnerWidth);
+ }
+ } else if (
+ !YGFloatIsUndefined(collectedFlexItemsValues.remainingFreeSpace) &&
+ collectedFlexItemsValues.remainingFreeSpace > 0) {
+ flexGrowFactor = currentRelativeChild->resolveFlexGrow();
+
+ // Is this child able to grow?
+ if (!YGFloatIsUndefined(flexGrowFactor) && flexGrowFactor != 0) {
+ updatedMainSize = YGNodeBoundAxis(
+ currentRelativeChild,
+ mainAxis,
+ childFlexBasis +
+ collectedFlexItemsValues.remainingFreeSpace /
+ collectedFlexItemsValues.totalFlexGrowFactors *
+ flexGrowFactor,
+ availableInnerMainDim,
+ availableInnerWidth);
+ }
+ }
+
+ deltaFreeSpace += updatedMainSize - childFlexBasis;
+
+ const float marginMain = YGUnwrapFloatOptional(
+ currentRelativeChild->getMarginForAxis(mainAxis, availableInnerWidth));
+ const float marginCross = YGUnwrapFloatOptional(
+ currentRelativeChild->getMarginForAxis(crossAxis, availableInnerWidth));
+
+ float childCrossSize;
+ float childMainSize = updatedMainSize + marginMain;
+ YGMeasureMode childCrossMeasureMode;
+ YGMeasureMode childMainMeasureMode = YGMeasureModeExactly;
+
+ if (!currentRelativeChild->getStyle().aspectRatio.isUndefined()) {
+ childCrossSize = isMainAxisRow ? (childMainSize - marginMain) /
+ currentRelativeChild->getStyle().aspectRatio.getValue()
+ : (childMainSize - marginMain) *
+ currentRelativeChild->getStyle().aspectRatio.getValue();
+ childCrossMeasureMode = YGMeasureModeExactly;
+
+ childCrossSize += marginCross;
+ } else if (
+ !YGFloatIsUndefined(availableInnerCrossDim) &&
+ !YGNodeIsStyleDimDefined(
+ currentRelativeChild, crossAxis, availableInnerCrossDim) &&
+ measureModeCrossDim == YGMeasureModeExactly &&
+ !(isNodeFlexWrap && flexBasisOverflows) &&
+ YGNodeAlignItem(node, currentRelativeChild) == YGAlignStretch &&
+ currentRelativeChild->marginLeadingValue(crossAxis).unit !=
+ YGUnitAuto &&
+ currentRelativeChild->marginTrailingValue(crossAxis).unit !=
+ YGUnitAuto) {
+ childCrossSize = availableInnerCrossDim;
+ childCrossMeasureMode = YGMeasureModeExactly;
+ } else if (!YGNodeIsStyleDimDefined(
+ currentRelativeChild, crossAxis, availableInnerCrossDim)) {
+ childCrossSize = availableInnerCrossDim;
+ childCrossMeasureMode = YGFloatIsUndefined(childCrossSize)
+ ? YGMeasureModeUndefined
+ : YGMeasureModeAtMost;
+ } else {
+ childCrossSize =
+ YGUnwrapFloatOptional(YGResolveValue(
+ currentRelativeChild->getResolvedDimension(dim[crossAxis]),
+ availableInnerCrossDim)) +
+ marginCross;
+ const bool isLoosePercentageMeasurement =
+ currentRelativeChild->getResolvedDimension(dim[crossAxis]).unit ==
+ YGUnitPercent &&
+ measureModeCrossDim != YGMeasureModeExactly;
+ childCrossMeasureMode =
+ YGFloatIsUndefined(childCrossSize) || isLoosePercentageMeasurement
+ ? YGMeasureModeUndefined
+ : YGMeasureModeExactly;
+ }
+
+ YGConstrainMaxSizeForMode(
+ currentRelativeChild,
+ mainAxis,
+ availableInnerMainDim,
+ availableInnerWidth,
+ &childMainMeasureMode,
+ &childMainSize);
+ YGConstrainMaxSizeForMode(
+ currentRelativeChild,
+ crossAxis,
+ availableInnerCrossDim,
+ availableInnerWidth,
+ &childCrossMeasureMode,
+ &childCrossSize);
+
+ const bool requiresStretchLayout =
+ !YGNodeIsStyleDimDefined(
+ currentRelativeChild, crossAxis, availableInnerCrossDim) &&
+ YGNodeAlignItem(node, currentRelativeChild) == YGAlignStretch &&
+ currentRelativeChild->marginLeadingValue(crossAxis).unit !=
+ YGUnitAuto &&
+ currentRelativeChild->marginTrailingValue(crossAxis).unit != YGUnitAuto;
+
+ const float childWidth = isMainAxisRow ? childMainSize : childCrossSize;
+ const float childHeight = !isMainAxisRow ? childMainSize : childCrossSize;
+
+ const YGMeasureMode childWidthMeasureMode =
+ isMainAxisRow ? childMainMeasureMode : childCrossMeasureMode;
+ const YGMeasureMode childHeightMeasureMode =
+ !isMainAxisRow ? childMainMeasureMode : childCrossMeasureMode;
+
+ // Recursively call the layout algorithm for this child with the updated
+ // main size.
+ YGLayoutNodeInternal(
+ currentRelativeChild,
+ childWidth,
+ childHeight,
+ node->getLayout().direction,
+ childWidthMeasureMode,
+ childHeightMeasureMode,
+ availableInnerWidth,
+ availableInnerHeight,
+ performLayout && !requiresStretchLayout,
+ "flex",
+ config);
+ node->setLayoutHadOverflow(
+ node->getLayout().hadOverflow |
+ currentRelativeChild->getLayout().hadOverflow);
+ }
+ return deltaFreeSpace;
+}
+
+// It distributes the free space to the flexible items.For those flexible items
+// whose min and max constraints are triggered, those flex item's clamped size
+// is removed from the remaingfreespace.
+static void YGDistributeFreeSpaceFirstPass(
+ YGCollectFlexItemsRowValues& collectedFlexItemsValues,
+ const YGFlexDirection mainAxis,
+ const float mainAxisownerSize,
+ const float availableInnerMainDim,
+ const float availableInnerWidth) {
+ float flexShrinkScaledFactor = 0;
+ float flexGrowFactor = 0;
+ float baseMainSize = 0;
+ float boundMainSize = 0;
+ float deltaFreeSpace = 0;
+
+ for (auto currentRelativeChild : collectedFlexItemsValues.relativeChildren) {
+ float childFlexBasis = YGUnwrapFloatOptional(YGNodeBoundAxisWithinMinAndMax(
+ currentRelativeChild,
+ mainAxis,
+ YGUnwrapFloatOptional(
+ currentRelativeChild->getLayout().computedFlexBasis),
+ mainAxisownerSize));
+
+ if (collectedFlexItemsValues.remainingFreeSpace < 0) {
+ flexShrinkScaledFactor =
+ -currentRelativeChild->resolveFlexShrink() * childFlexBasis;
+
+ // Is this child able to shrink?
+ if (!YGFloatIsUndefined(flexShrinkScaledFactor) &&
+ flexShrinkScaledFactor != 0) {
+ baseMainSize = childFlexBasis +
+ collectedFlexItemsValues.remainingFreeSpace /
+ collectedFlexItemsValues.totalFlexShrinkScaledFactors *
+ flexShrinkScaledFactor;
+ boundMainSize = YGNodeBoundAxis(
+ currentRelativeChild,
+ mainAxis,
+ baseMainSize,
+ availableInnerMainDim,
+ availableInnerWidth);
+ if (!YGFloatIsUndefined(baseMainSize) &&
+ !YGFloatIsUndefined(boundMainSize) &&
+ baseMainSize != boundMainSize) {
+ // By excluding this item's size and flex factor from remaining,
+ // this item's
+ // min/max constraints should also trigger in the second pass
+ // resulting in the
+ // item's size calculation being identical in the first and second
+ // passes.
+ deltaFreeSpace += boundMainSize - childFlexBasis;
+ collectedFlexItemsValues.totalFlexShrinkScaledFactors -=
+ flexShrinkScaledFactor;
+ }
+ }
+ } else if (
+ !YGFloatIsUndefined(collectedFlexItemsValues.remainingFreeSpace) &&
+ collectedFlexItemsValues.remainingFreeSpace > 0) {
+ flexGrowFactor = currentRelativeChild->resolveFlexGrow();
+
+ // Is this child able to grow?
+ if (!YGFloatIsUndefined(flexGrowFactor) && flexGrowFactor != 0) {
+ baseMainSize = childFlexBasis +
+ collectedFlexItemsValues.remainingFreeSpace /
+ collectedFlexItemsValues.totalFlexGrowFactors * flexGrowFactor;
+ boundMainSize = YGNodeBoundAxis(
+ currentRelativeChild,
+ mainAxis,
+ baseMainSize,
+ availableInnerMainDim,
+ availableInnerWidth);
+
+ if (!YGFloatIsUndefined(baseMainSize) &&
+ !YGFloatIsUndefined(boundMainSize) &&
+ baseMainSize != boundMainSize) {
+ // By excluding this item's size and flex factor from remaining,
+ // this item's
+ // min/max constraints should also trigger in the second pass
+ // resulting in the
+ // item's size calculation being identical in the first and second
+ // passes.
+ deltaFreeSpace += boundMainSize - childFlexBasis;
+ collectedFlexItemsValues.totalFlexGrowFactors -= flexGrowFactor;
+ }
+ }
+ }
+ }
+ collectedFlexItemsValues.remainingFreeSpace -= deltaFreeSpace;
+}
+
+// Do two passes over the flex items to figure out how to distribute the
+// remaining space.
+// The first pass finds the items whose min/max constraints trigger,
+// freezes them at those
+// sizes, and excludes those sizes from the remaining space. The second
+// pass sets the size
+// of each flexible item. It distributes the remaining space amongst the
+// items whose min/max
+// constraints didn't trigger in pass 1. For the other items, it sets
+// their sizes by forcing
+// their min/max constraints to trigger again.
+//
+// This two pass approach for resolving min/max constraints deviates from
+// the spec. The
+// spec (https://www.w3.org/TR/YG-flexbox-1/#resolve-flexible-lengths)
+// describes a process
+// that needs to be repeated a variable number of times. The algorithm
+// implemented here
+// won't handle all cases but it was simpler to implement and it mitigates
+// performance
+// concerns because we know exactly how many passes it'll do.
+//
+// At the end of this function the child nodes would have the proper size
+// assigned to them.
+//
+static void YGResolveFlexibleLength(
+ const YGNodeRef node,
+ YGCollectFlexItemsRowValues& collectedFlexItemsValues,
+ const YGFlexDirection mainAxis,
+ const YGFlexDirection crossAxis,
+ const float mainAxisownerSize,
+ const float availableInnerMainDim,
+ const float availableInnerCrossDim,
+ const float availableInnerWidth,
+ const float availableInnerHeight,
+ const bool flexBasisOverflows,
+ const YGMeasureMode measureModeCrossDim,
+ const bool performLayout,
+ const YGConfigRef config) {
+ const float originalFreeSpace = collectedFlexItemsValues.remainingFreeSpace;
+ // First pass: detect the flex items whose min/max constraints trigger
+ YGDistributeFreeSpaceFirstPass(
+ collectedFlexItemsValues,
+ mainAxis,
+ mainAxisownerSize,
+ availableInnerMainDim,
+ availableInnerWidth);
+
+ // Second pass: resolve the sizes of the flexible items
+ const float distributedFreeSpace = YGDistributeFreeSpaceSecondPass(
+ collectedFlexItemsValues,
+ node,
+ mainAxis,
+ crossAxis,
+ mainAxisownerSize,
+ availableInnerMainDim,
+ availableInnerCrossDim,
+ availableInnerWidth,
+ availableInnerHeight,
+ flexBasisOverflows,
+ measureModeCrossDim,
+ performLayout,
+ config);
+
+ collectedFlexItemsValues.remainingFreeSpace =
+ originalFreeSpace - distributedFreeSpace;
+}
+
+static void YGJustifyMainAxis(
+ const YGNodeRef node,
+ YGCollectFlexItemsRowValues& collectedFlexItemsValues,
+ const uint32_t& startOfLineIndex,
+ const YGFlexDirection& mainAxis,
+ const YGFlexDirection& crossAxis,
+ const YGMeasureMode& measureModeMainDim,
+ const YGMeasureMode& measureModeCrossDim,
+ const float& mainAxisownerSize,
+ const float& ownerWidth,
+ const float& availableInnerMainDim,
+ const float& availableInnerCrossDim,
+ const float& availableInnerWidth,
+ const bool& performLayout) {
+ const YGStyle& style = node->getStyle();
+ const float leadingPaddingAndBorderMain = YGUnwrapFloatOptional(
+ node->getLeadingPaddingAndBorder(mainAxis, ownerWidth));
+ const float trailingPaddingAndBorderMain = YGUnwrapFloatOptional(
+ node->getTrailingPaddingAndBorder(mainAxis, ownerWidth));
+ // If we are using "at most" rules in the main axis, make sure that
+ // remainingFreeSpace is 0 when min main dimension is not given
+ if (measureModeMainDim == YGMeasureModeAtMost &&
+ collectedFlexItemsValues.remainingFreeSpace > 0) {
+ if (style.minDimensions[dim[mainAxis]].unit != YGUnitUndefined &&
+ !YGResolveValue(style.minDimensions[dim[mainAxis]], mainAxisownerSize)
+ .isUndefined()) {
+ // This condition makes sure that if the size of main dimension(after
+ // considering child nodes main dim, leading and trailing padding etc)
+ // falls below min dimension, then the remainingFreeSpace is reassigned
+ // considering the min dimension
+
+ // `minAvailableMainDim` denotes minimum available space in which child
+ // can be laid out, it will exclude space consumed by padding and border.
+ const float minAvailableMainDim =
+ YGUnwrapFloatOptional(YGResolveValue(
+ style.minDimensions[dim[mainAxis]], mainAxisownerSize)) -
+ leadingPaddingAndBorderMain - trailingPaddingAndBorderMain;
+ const float occupiedSpaceByChildNodes =
+ availableInnerMainDim - collectedFlexItemsValues.remainingFreeSpace;
+ collectedFlexItemsValues.remainingFreeSpace =
+ YGFloatMax(0, minAvailableMainDim - occupiedSpaceByChildNodes);
+ } else {
+ collectedFlexItemsValues.remainingFreeSpace = 0;
+ }
+ }
+
+ int numberOfAutoMarginsOnCurrentLine = 0;
+ for (uint32_t i = startOfLineIndex;
+ i < collectedFlexItemsValues.endOfLineIndex;
+ i++) {
+ const YGNodeRef child = node->getChild(i);
+ if (child->getStyle().positionType == YGPositionTypeRelative) {
+ if (child->marginLeadingValue(mainAxis).unit == YGUnitAuto) {
+ numberOfAutoMarginsOnCurrentLine++;
+ }
+ if (child->marginTrailingValue(mainAxis).unit == YGUnitAuto) {
+ numberOfAutoMarginsOnCurrentLine++;
+ }
+ }
+ }
+
+ // In order to position the elements in the main axis, we have two
+ // controls. The space between the beginning and the first element
+ // and the space between each two elements.
+ float leadingMainDim = 0;
+ float betweenMainDim = 0;
+ const YGJustify justifyContent = node->getStyle().justifyContent;
+
+ if (numberOfAutoMarginsOnCurrentLine == 0) {
+ switch (justifyContent) {
+ case YGJustifyCenter:
+ leadingMainDim = collectedFlexItemsValues.remainingFreeSpace / 2;
+ break;
+ case YGJustifyFlexEnd:
+ leadingMainDim = collectedFlexItemsValues.remainingFreeSpace;
+ break;
+ case YGJustifySpaceBetween:
+ if (collectedFlexItemsValues.itemsOnLine > 1) {
+ betweenMainDim =
+ YGFloatMax(collectedFlexItemsValues.remainingFreeSpace, 0) /
+ (collectedFlexItemsValues.itemsOnLine - 1);
+ } else {
+ betweenMainDim = 0;
+ }
+ break;
+ case YGJustifySpaceEvenly:
+ // Space is distributed evenly across all elements
+ betweenMainDim = collectedFlexItemsValues.remainingFreeSpace /
+ (collectedFlexItemsValues.itemsOnLine + 1);
+ leadingMainDim = betweenMainDim;
+ break;
+ case YGJustifySpaceAround:
+ // Space on the edges is half of the space between elements
+ betweenMainDim = collectedFlexItemsValues.remainingFreeSpace /
+ collectedFlexItemsValues.itemsOnLine;
+ leadingMainDim = betweenMainDim / 2;
+ break;
+ case YGJustifyFlexStart:
+ break;
+ }
+ }
+
+ collectedFlexItemsValues.mainDim =
+ leadingPaddingAndBorderMain + leadingMainDim;
+ collectedFlexItemsValues.crossDim = 0;
+
+ float maxAscentForCurrentLine = 0;
+ float maxDescentForCurrentLine = 0;
+ bool isNodeBaselineLayout = YGIsBaselineLayout(node);
+ for (uint32_t i = startOfLineIndex;
+ i < collectedFlexItemsValues.endOfLineIndex;
+ i++) {
+ const YGNodeRef child = node->getChild(i);
+ const YGStyle& childStyle = child->getStyle();
+ const YGLayout childLayout = child->getLayout();
+ if (childStyle.display == YGDisplayNone) {
+ continue;
+ }
+ if (childStyle.positionType == YGPositionTypeAbsolute &&
+ child->isLeadingPositionDefined(mainAxis)) {
+ if (performLayout) {
+ // In case the child is position absolute and has left/top being
+ // defined, we override the position to whatever the user said
+ // (and margin/border).
+ child->setLayoutPosition(
+ YGUnwrapFloatOptional(
+ child->getLeadingPosition(mainAxis, availableInnerMainDim)) +
+ node->getLeadingBorder(mainAxis) +
+ YGUnwrapFloatOptional(
+ child->getLeadingMargin(mainAxis, availableInnerWidth)),
+ pos[mainAxis]);
+ }
+ } else {
+ // Now that we placed the element, we need to update the variables.
+ // We need to do that only for relative elements. Absolute elements
+ // do not take part in that phase.
+ if (childStyle.positionType == YGPositionTypeRelative) {
+ if (child->marginLeadingValue(mainAxis).unit == YGUnitAuto) {
+ collectedFlexItemsValues.mainDim +=
+ collectedFlexItemsValues.remainingFreeSpace /
+ numberOfAutoMarginsOnCurrentLine;
+ }
+
+ if (performLayout) {
+ child->setLayoutPosition(
+ childLayout.position[pos[mainAxis]] +
+ collectedFlexItemsValues.mainDim,
+ pos[mainAxis]);
+ }
+
+ if (child->marginTrailingValue(mainAxis).unit == YGUnitAuto) {
+ collectedFlexItemsValues.mainDim +=
+ collectedFlexItemsValues.remainingFreeSpace /
+ numberOfAutoMarginsOnCurrentLine;
+ }
+ bool canSkipFlex =
+ !performLayout && measureModeCrossDim == YGMeasureModeExactly;
+ if (canSkipFlex) {
+ // If we skipped the flex step, then we can't rely on the
+ // measuredDims because
+ // they weren't computed. This means we can't call
+ // YGNodeDimWithMargin.
+ collectedFlexItemsValues.mainDim += betweenMainDim +
+ YGUnwrapFloatOptional(child->getMarginForAxis(
+ mainAxis, availableInnerWidth)) +
+ YGUnwrapFloatOptional(childLayout.computedFlexBasis);
+ collectedFlexItemsValues.crossDim = availableInnerCrossDim;
+ } else {
+ // The main dimension is the sum of all the elements dimension plus
+ // the spacing.
+ collectedFlexItemsValues.mainDim += betweenMainDim +
+ YGNodeDimWithMargin(child, mainAxis, availableInnerWidth);
+
+ if (isNodeBaselineLayout) {
+ // If the child is baseline aligned then the cross dimension is
+ // calculated by adding maxAscent and maxDescent from the baseline.
+ const float ascent = YGBaseline(child) +
+ YGUnwrapFloatOptional(child->getLeadingMargin(
+ YGFlexDirectionColumn, availableInnerWidth));
+ const float descent =
+ child->getLayout().measuredDimensions[YGDimensionHeight] +
+ YGUnwrapFloatOptional(child->getMarginForAxis(
+ YGFlexDirectionColumn, availableInnerWidth)) -
+ ascent;
+
+ maxAscentForCurrentLine =
+ YGFloatMax(maxAscentForCurrentLine, ascent);
+ maxDescentForCurrentLine =
+ YGFloatMax(maxDescentForCurrentLine, descent);
+ } else {
+ // The cross dimension is the max of the elements dimension since
+ // there can only be one element in that cross dimension in the case
+ // when the items are not baseline aligned
+ collectedFlexItemsValues.crossDim = YGFloatMax(
+ collectedFlexItemsValues.crossDim,
+ YGNodeDimWithMargin(child, crossAxis, availableInnerWidth));
+ }
+ }
+ } else if (performLayout) {
+ child->setLayoutPosition(
+ childLayout.position[pos[mainAxis]] +
+ node->getLeadingBorder(mainAxis) + leadingMainDim,
+ pos[mainAxis]);
+ }
+ }
+ }
+ collectedFlexItemsValues.mainDim += trailingPaddingAndBorderMain;
+
+ if (isNodeBaselineLayout) {
+ collectedFlexItemsValues.crossDim =
+ maxAscentForCurrentLine + maxDescentForCurrentLine;
+ }
+}
+
+//
+// This is the main routine that implements a subset of the flexbox layout
+// algorithm
+// described in the W3C YG documentation: https://www.w3.org/TR/YG3-flexbox/.
+//
+// Limitations of this algorithm, compared to the full standard:
+// * Display property is always assumed to be 'flex' except for Text nodes,
+// which
+// are assumed to be 'inline-flex'.
+// * The 'zIndex' property (or any form of z ordering) is not supported. Nodes
+// are
+// stacked in document order.
+// * The 'order' property is not supported. The order of flex items is always
+// defined
+// by document order.
+// * The 'visibility' property is always assumed to be 'visible'. Values of
+// 'collapse'
+// and 'hidden' are not supported.
+// * There is no support for forced breaks.
+// * It does not support vertical inline directions (top-to-bottom or
+// bottom-to-top text).
+//
+// Deviations from standard:
+// * Section 4.5 of the spec indicates that all flex items have a default
+// minimum
+// main size. For text blocks, for example, this is the width of the widest
+// word.
+// Calculating the minimum width is expensive, so we forego it and assume a
+// default
+// minimum main size of 0.
+// * Min/Max sizes in the main axis are not honored when resolving flexible
+// lengths.
+// * The spec indicates that the default value for 'flexDirection' is 'row',
+// but
+// the algorithm below assumes a default of 'column'.
+//
+// Input parameters:
+// - node: current node to be sized and layed out
+// - availableWidth & availableHeight: available size to be used for sizing
+// the node
+// or YGUndefined if the size is not available; interpretation depends on
+// layout
+// flags
+// - ownerDirection: the inline (text) direction within the owner
+// (left-to-right or
+// right-to-left)
+// - widthMeasureMode: indicates the sizing rules for the width (see below
+// for explanation)
+// - heightMeasureMode: indicates the sizing rules for the height (see below
+// for explanation)
+// - performLayout: specifies whether the caller is interested in just the
+// dimensions
+// of the node or it requires the entire node and its subtree to be layed
+// out
+// (with final positions)
+//
+// Details:
+// This routine is called recursively to lay out subtrees of flexbox
+// elements. It uses the
+// information in node.style, which is treated as a read-only input. It is
+// responsible for
+// setting the layout.direction and layout.measuredDimensions fields for the
+// input node as well
+// as the layout.position and layout.lineIndex fields for its child nodes.
+// The
+// layout.measuredDimensions field includes any border or padding for the
+// node but does
+// not include margins.
+//
+// The spec describes four different layout modes: "fill available", "max
+// content", "min
+// content",
+// and "fit content". Of these, we don't use "min content" because we don't
+// support default
+// minimum main sizes (see above for details). Each of our measure modes maps
+// to a layout mode
+// from the spec (https://www.w3.org/TR/YG3-sizing/#terms):
+// - YGMeasureModeUndefined: max content
+// - YGMeasureModeExactly: fill available
+// - YGMeasureModeAtMost: fit content
+//
+// When calling YGNodelayoutImpl and YGLayoutNodeInternal, if the caller
+// passes an available size of undefined then it must also pass a measure
+// mode of YGMeasureModeUndefined in that dimension.
+//
+static void YGNodelayoutImpl(
+ const YGNodeRef node,
+ const float availableWidth,
+ const float availableHeight,
+ const YGDirection ownerDirection,
+ const YGMeasureMode widthMeasureMode,
+ const YGMeasureMode heightMeasureMode,
+ const float ownerWidth,
+ const float ownerHeight,
+ const bool performLayout,
+ const YGConfigRef config) {
+ YGAssertWithNode(
+ node,
+ YGFloatIsUndefined(availableWidth)
+ ? widthMeasureMode == YGMeasureModeUndefined
+ : true,
+ "availableWidth is indefinite so widthMeasureMode must be "
+ "YGMeasureModeUndefined");
+ YGAssertWithNode(
+ node,
+ YGFloatIsUndefined(availableHeight)
+ ? heightMeasureMode == YGMeasureModeUndefined
+ : true,
+ "availableHeight is indefinite so heightMeasureMode must be "
+ "YGMeasureModeUndefined");
+
+ // Set the resolved resolution in the node's layout.
+ const YGDirection direction = node->resolveDirection(ownerDirection);
+ node->setLayoutDirection(direction);
+
+ const YGFlexDirection flexRowDirection =
+ YGResolveFlexDirection(YGFlexDirectionRow, direction);
+ const YGFlexDirection flexColumnDirection =
+ YGResolveFlexDirection(YGFlexDirectionColumn, direction);
+
+ node->setLayoutMargin(
+ YGUnwrapFloatOptional(
+ node->getLeadingMargin(flexRowDirection, ownerWidth)),
+ YGEdgeStart);
+ node->setLayoutMargin(
+ YGUnwrapFloatOptional(
+ node->getTrailingMargin(flexRowDirection, ownerWidth)),
+ YGEdgeEnd);
+ node->setLayoutMargin(
+ YGUnwrapFloatOptional(
+ node->getLeadingMargin(flexColumnDirection, ownerWidth)),
+ YGEdgeTop);
+ node->setLayoutMargin(
+ YGUnwrapFloatOptional(
+ node->getTrailingMargin(flexColumnDirection, ownerWidth)),
+ YGEdgeBottom);
+
+ node->setLayoutBorder(node->getLeadingBorder(flexRowDirection), YGEdgeStart);
+ node->setLayoutBorder(node->getTrailingBorder(flexRowDirection), YGEdgeEnd);
+ node->setLayoutBorder(node->getLeadingBorder(flexColumnDirection), YGEdgeTop);
+ node->setLayoutBorder(
+ node->getTrailingBorder(flexColumnDirection), YGEdgeBottom);
+
+ node->setLayoutPadding(
+ YGUnwrapFloatOptional(
+ node->getLeadingPadding(flexRowDirection, ownerWidth)),
+ YGEdgeStart);
+ node->setLayoutPadding(
+ YGUnwrapFloatOptional(
+ node->getTrailingPadding(flexRowDirection, ownerWidth)),
+ YGEdgeEnd);
+ node->setLayoutPadding(
+ YGUnwrapFloatOptional(
+ node->getLeadingPadding(flexColumnDirection, ownerWidth)),
+ YGEdgeTop);
+ node->setLayoutPadding(
+ YGUnwrapFloatOptional(
+ node->getTrailingPadding(flexColumnDirection, ownerWidth)),
+ YGEdgeBottom);
+
+ if (node->getMeasure() != nullptr) {
+ YGNodeWithMeasureFuncSetMeasuredDimensions(
+ node,
+ availableWidth,
+ availableHeight,
+ widthMeasureMode,
+ heightMeasureMode,
+ ownerWidth,
+ ownerHeight);
+ return;
+ }
+
+ const uint32_t childCount = YGNodeGetChildCount(node);
+ if (childCount == 0) {
+ YGNodeEmptyContainerSetMeasuredDimensions(
+ node,
+ availableWidth,
+ availableHeight,
+ widthMeasureMode,
+ heightMeasureMode,
+ ownerWidth,
+ ownerHeight);
+ return;
+ }
+
+ // If we're not being asked to perform a full layout we can skip the algorithm
+ // if we already know the size
+ if (!performLayout &&
+ YGNodeFixedSizeSetMeasuredDimensions(
+ node,
+ availableWidth,
+ availableHeight,
+ widthMeasureMode,
+ heightMeasureMode,
+ ownerWidth,
+ ownerHeight)) {
+ return;
+ }
+
+ // At this point we know we're going to perform work. Ensure that each child
+ // has a mutable copy.
+ node->cloneChildrenIfNeeded();
+ // Reset layout flags, as they could have changed.
+ node->setLayoutHadOverflow(false);
+
+ // STEP 1: CALCULATE VALUES FOR REMAINDER OF ALGORITHM
+ const YGFlexDirection mainAxis =
+ YGResolveFlexDirection(node->getStyle().flexDirection, direction);
+ const YGFlexDirection crossAxis = YGFlexDirectionCross(mainAxis, direction);
+ const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
+ const bool isNodeFlexWrap = node->getStyle().flexWrap != YGWrapNoWrap;
+
+ const float mainAxisownerSize = isMainAxisRow ? ownerWidth : ownerHeight;
+ const float crossAxisownerSize = isMainAxisRow ? ownerHeight : ownerWidth;
+
+ const float leadingPaddingAndBorderCross = YGUnwrapFloatOptional(
+ node->getLeadingPaddingAndBorder(crossAxis, ownerWidth));
+ const float paddingAndBorderAxisMain =
+ YGNodePaddingAndBorderForAxis(node, mainAxis, ownerWidth);
+ const float paddingAndBorderAxisCross =
+ YGNodePaddingAndBorderForAxis(node, crossAxis, ownerWidth);
+
+ YGMeasureMode measureModeMainDim =
+ isMainAxisRow ? widthMeasureMode : heightMeasureMode;
+ YGMeasureMode measureModeCrossDim =
+ isMainAxisRow ? heightMeasureMode : widthMeasureMode;
+
+ const float paddingAndBorderAxisRow =
+ isMainAxisRow ? paddingAndBorderAxisMain : paddingAndBorderAxisCross;
+ const float paddingAndBorderAxisColumn =
+ isMainAxisRow ? paddingAndBorderAxisCross : paddingAndBorderAxisMain;
+
+ const float marginAxisRow = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionRow, ownerWidth));
+ const float marginAxisColumn = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionColumn, ownerWidth));
+
+ const float minInnerWidth =
+ YGUnwrapFloatOptional(YGResolveValue(
+ node->getStyle().minDimensions[YGDimensionWidth], ownerWidth)) -
+ paddingAndBorderAxisRow;
+ const float maxInnerWidth =
+ YGUnwrapFloatOptional(YGResolveValue(
+ node->getStyle().maxDimensions[YGDimensionWidth], ownerWidth)) -
+ paddingAndBorderAxisRow;
+ const float minInnerHeight =
+ YGUnwrapFloatOptional(YGResolveValue(
+ node->getStyle().minDimensions[YGDimensionHeight], ownerHeight)) -
+ paddingAndBorderAxisColumn;
+ const float maxInnerHeight =
+ YGUnwrapFloatOptional(YGResolveValue(
+ node->getStyle().maxDimensions[YGDimensionHeight], ownerHeight)) -
+ paddingAndBorderAxisColumn;
+
+ const float minInnerMainDim = isMainAxisRow ? minInnerWidth : minInnerHeight;
+ const float maxInnerMainDim = isMainAxisRow ? maxInnerWidth : maxInnerHeight;
+
+ // STEP 2: DETERMINE AVAILABLE SIZE IN MAIN AND CROSS DIRECTIONS
+
+ float availableInnerWidth = YGNodeCalculateAvailableInnerDim(
+ node, YGFlexDirectionRow, availableWidth, ownerWidth);
+ float availableInnerHeight = YGNodeCalculateAvailableInnerDim(
+ node, YGFlexDirectionColumn, availableHeight, ownerHeight);
+
+ float availableInnerMainDim =
+ isMainAxisRow ? availableInnerWidth : availableInnerHeight;
+ const float availableInnerCrossDim =
+ isMainAxisRow ? availableInnerHeight : availableInnerWidth;
+
+ float totalOuterFlexBasis = 0;
+
+ // STEP 3: DETERMINE FLEX BASIS FOR EACH ITEM
+
+ YGNodeComputeFlexBasisForChildren(
+ node,
+ availableInnerWidth,
+ availableInnerHeight,
+ widthMeasureMode,
+ heightMeasureMode,
+ direction,
+ mainAxis,
+ config,
+ performLayout,
+ totalOuterFlexBasis);
+
+ const bool flexBasisOverflows = measureModeMainDim == YGMeasureModeUndefined
+ ? false
+ : totalOuterFlexBasis > availableInnerMainDim;
+ if (isNodeFlexWrap && flexBasisOverflows &&
+ measureModeMainDim == YGMeasureModeAtMost) {
+ measureModeMainDim = YGMeasureModeExactly;
+ }
+ // STEP 4: COLLECT FLEX ITEMS INTO FLEX LINES
+
+ // Indexes of children that represent the first and last items in the line.
+ uint32_t startOfLineIndex = 0;
+ uint32_t endOfLineIndex = 0;
+
+ // Number of lines.
+ uint32_t lineCount = 0;
+
+ // Accumulated cross dimensions of all lines so far.
+ float totalLineCrossDim = 0;
+
+ // Max main dimension of all the lines.
+ float maxLineMainDim = 0;
+ YGCollectFlexItemsRowValues collectedFlexItemsValues;
+ for (; endOfLineIndex < childCount;
+ lineCount++, startOfLineIndex = endOfLineIndex) {
+ collectedFlexItemsValues = YGCalculateCollectFlexItemsRowValues(
+ node,
+ ownerDirection,
+ mainAxisownerSize,
+ availableInnerWidth,
+ availableInnerMainDim,
+ startOfLineIndex,
+ lineCount);
+ endOfLineIndex = collectedFlexItemsValues.endOfLineIndex;
+
+ // If we don't need to measure the cross axis, we can skip the entire flex
+ // step.
+ const bool canSkipFlex =
+ !performLayout && measureModeCrossDim == YGMeasureModeExactly;
+
+ // STEP 5: RESOLVING FLEXIBLE LENGTHS ON MAIN AXIS
+ // Calculate the remaining available space that needs to be allocated.
+ // If the main dimension size isn't known, it is computed based on
+ // the line length, so there's no more space left to distribute.
+
+ bool sizeBasedOnContent = false;
+ // If we don't measure with exact main dimension we want to ensure we don't
+ // violate min and max
+ if (measureModeMainDim != YGMeasureModeExactly) {
+ if (!YGFloatIsUndefined(minInnerMainDim) &&
+ collectedFlexItemsValues.sizeConsumedOnCurrentLine <
+ minInnerMainDim) {
+ availableInnerMainDim = minInnerMainDim;
+ } else if (
+ !YGFloatIsUndefined(maxInnerMainDim) &&
+ collectedFlexItemsValues.sizeConsumedOnCurrentLine >
+ maxInnerMainDim) {
+ availableInnerMainDim = maxInnerMainDim;
+ } else {
+ if (!node->getConfig()->useLegacyStretchBehaviour &&
+ ((YGFloatIsUndefined(
+ collectedFlexItemsValues.totalFlexGrowFactors) &&
+ collectedFlexItemsValues.totalFlexGrowFactors == 0) ||
+ (YGFloatIsUndefined(node->resolveFlexGrow()) &&
+ node->resolveFlexGrow() == 0))) {
+ // If we don't have any children to flex or we can't flex the node
+ // itself, space we've used is all space we need. Root node also
+ // should be shrunk to minimum
+ availableInnerMainDim =
+ collectedFlexItemsValues.sizeConsumedOnCurrentLine;
+ }
+
+ if (node->getConfig()->useLegacyStretchBehaviour) {
+ node->setLayoutDidUseLegacyFlag(true);
+ }
+ sizeBasedOnContent = !node->getConfig()->useLegacyStretchBehaviour;
+ }
+ }
+
+ if (!sizeBasedOnContent && !YGFloatIsUndefined(availableInnerMainDim)) {
+ collectedFlexItemsValues.remainingFreeSpace = availableInnerMainDim -
+ collectedFlexItemsValues.sizeConsumedOnCurrentLine;
+ } else if (collectedFlexItemsValues.sizeConsumedOnCurrentLine < 0) {
+ // availableInnerMainDim is indefinite which means the node is being sized
+ // based on its content. sizeConsumedOnCurrentLine is negative which means
+ // the node will allocate 0 points for its content. Consequently,
+ // remainingFreeSpace is 0 - sizeConsumedOnCurrentLine.
+ collectedFlexItemsValues.remainingFreeSpace =
+ -collectedFlexItemsValues.sizeConsumedOnCurrentLine;
+ }
+
+ if (!canSkipFlex) {
+ YGResolveFlexibleLength(
+ node,
+ collectedFlexItemsValues,
+ mainAxis,
+ crossAxis,
+ mainAxisownerSize,
+ availableInnerMainDim,
+ availableInnerCrossDim,
+ availableInnerWidth,
+ availableInnerHeight,
+ flexBasisOverflows,
+ measureModeCrossDim,
+ performLayout,
+ config);
+ }
+
+ node->setLayoutHadOverflow(
+ node->getLayout().hadOverflow |
+ (collectedFlexItemsValues.remainingFreeSpace < 0));
+
+ // STEP 6: MAIN-AXIS JUSTIFICATION & CROSS-AXIS SIZE DETERMINATION
+
+ // At this point, all the children have their dimensions set in the main
+ // axis.
+ // Their dimensions are also set in the cross axis with the exception of
+ // items
+ // that are aligned "stretch". We need to compute these stretch values and
+ // set the final positions.
+
+ YGJustifyMainAxis(
+ node,
+ collectedFlexItemsValues,
+ startOfLineIndex,
+ mainAxis,
+ crossAxis,
+ measureModeMainDim,
+ measureModeCrossDim,
+ mainAxisownerSize,
+ ownerWidth,
+ availableInnerMainDim,
+ availableInnerCrossDim,
+ availableInnerWidth,
+ performLayout);
+
+ float containerCrossAxis = availableInnerCrossDim;
+ if (measureModeCrossDim == YGMeasureModeUndefined ||
+ measureModeCrossDim == YGMeasureModeAtMost) {
+ // Compute the cross axis from the max cross dimension of the children.
+ containerCrossAxis =
+ YGNodeBoundAxis(
+ node,
+ crossAxis,
+ collectedFlexItemsValues.crossDim + paddingAndBorderAxisCross,
+ crossAxisownerSize,
+ ownerWidth) -
+ paddingAndBorderAxisCross;
+ }
+
+ // If there's no flex wrap, the cross dimension is defined by the container.
+ if (!isNodeFlexWrap && measureModeCrossDim == YGMeasureModeExactly) {
+ collectedFlexItemsValues.crossDim = availableInnerCrossDim;
+ }
+
+ // Clamp to the min/max size specified on the container.
+ collectedFlexItemsValues.crossDim =
+ YGNodeBoundAxis(
+ node,
+ crossAxis,
+ collectedFlexItemsValues.crossDim + paddingAndBorderAxisCross,
+ crossAxisownerSize,
+ ownerWidth) -
+ paddingAndBorderAxisCross;
+
+ // STEP 7: CROSS-AXIS ALIGNMENT
+ // We can skip child alignment if we're just measuring the container.
+ if (performLayout) {
+ for (uint32_t i = startOfLineIndex; i < endOfLineIndex; i++) {
+ const YGNodeRef child = node->getChild(i);
+ if (child->getStyle().display == YGDisplayNone) {
+ continue;
+ }
+ if (child->getStyle().positionType == YGPositionTypeAbsolute) {
+ // If the child is absolutely positioned and has a
+ // top/left/bottom/right set, override
+ // all the previously computed positions to set it correctly.
+ const bool isChildLeadingPosDefined =
+ child->isLeadingPositionDefined(crossAxis);
+ if (isChildLeadingPosDefined) {
+ child->setLayoutPosition(
+ YGUnwrapFloatOptional(child->getLeadingPosition(
+ crossAxis, availableInnerCrossDim)) +
+ node->getLeadingBorder(crossAxis) +
+ YGUnwrapFloatOptional(child->getLeadingMargin(
+ crossAxis, availableInnerWidth)),
+ pos[crossAxis]);
+ }
+ // If leading position is not defined or calculations result in Nan,
+ // default to border + margin
+ if (!isChildLeadingPosDefined ||
+ YGFloatIsUndefined(child->getLayout().position[pos[crossAxis]])) {
+ child->setLayoutPosition(
+ node->getLeadingBorder(crossAxis) +
+ YGUnwrapFloatOptional(child->getLeadingMargin(
+ crossAxis, availableInnerWidth)),
+ pos[crossAxis]);
+ }
+ } else {
+ float leadingCrossDim = leadingPaddingAndBorderCross;
+
+ // For a relative children, we're either using alignItems (owner) or
+ // alignSelf (child) in order to determine the position in the cross
+ // axis
+ const YGAlign alignItem = YGNodeAlignItem(node, child);
+
+ // If the child uses align stretch, we need to lay it out one more
+ // time, this time
+ // forcing the cross-axis size to be the computed cross size for the
+ // current line.
+ if (alignItem == YGAlignStretch &&
+ child->marginLeadingValue(crossAxis).unit != YGUnitAuto &&
+ child->marginTrailingValue(crossAxis).unit != YGUnitAuto) {
+ // If the child defines a definite size for its cross axis, there's
+ // no need to stretch.
+ if (!YGNodeIsStyleDimDefined(
+ child, crossAxis, availableInnerCrossDim)) {
+ float childMainSize =
+ child->getLayout().measuredDimensions[dim[mainAxis]];
+ float childCrossSize =
+ !child->getStyle().aspectRatio.isUndefined()
+ ? ((YGUnwrapFloatOptional(child->getMarginForAxis(
+ crossAxis, availableInnerWidth)) +
+ (isMainAxisRow ? childMainSize /
+ child->getStyle().aspectRatio.getValue()
+ : childMainSize *
+ child->getStyle().aspectRatio.getValue())))
+ : collectedFlexItemsValues.crossDim;
+
+ childMainSize += YGUnwrapFloatOptional(
+ child->getMarginForAxis(mainAxis, availableInnerWidth));
+
+ YGMeasureMode childMainMeasureMode = YGMeasureModeExactly;
+ YGMeasureMode childCrossMeasureMode = YGMeasureModeExactly;
+ YGConstrainMaxSizeForMode(
+ child,
+ mainAxis,
+ availableInnerMainDim,
+ availableInnerWidth,
+ &childMainMeasureMode,
+ &childMainSize);
+ YGConstrainMaxSizeForMode(
+ child,
+ crossAxis,
+ availableInnerCrossDim,
+ availableInnerWidth,
+ &childCrossMeasureMode,
+ &childCrossSize);
+
+ const float childWidth =
+ isMainAxisRow ? childMainSize : childCrossSize;
+ const float childHeight =
+ !isMainAxisRow ? childMainSize : childCrossSize;
+
+ const YGMeasureMode childWidthMeasureMode =
+ YGFloatIsUndefined(childWidth) ? YGMeasureModeUndefined
+ : YGMeasureModeExactly;
+ const YGMeasureMode childHeightMeasureMode =
+ YGFloatIsUndefined(childHeight) ? YGMeasureModeUndefined
+ : YGMeasureModeExactly;
+
+ YGLayoutNodeInternal(
+ child,
+ childWidth,
+ childHeight,
+ direction,
+ childWidthMeasureMode,
+ childHeightMeasureMode,
+ availableInnerWidth,
+ availableInnerHeight,
+ true,
+ "stretch",
+ config);
+ }
+ } else {
+ const float remainingCrossDim = containerCrossAxis -
+ YGNodeDimWithMargin(child, crossAxis, availableInnerWidth);
+
+ if (child->marginLeadingValue(crossAxis).unit == YGUnitAuto &&
+ child->marginTrailingValue(crossAxis).unit == YGUnitAuto) {
+ leadingCrossDim += YGFloatMax(0.0f, remainingCrossDim / 2);
+ } else if (
+ child->marginTrailingValue(crossAxis).unit == YGUnitAuto) {
+ // No-Op
+ } else if (
+ child->marginLeadingValue(crossAxis).unit == YGUnitAuto) {
+ leadingCrossDim += YGFloatMax(0.0f, remainingCrossDim);
+ } else if (alignItem == YGAlignFlexStart) {
+ // No-Op
+ } else if (alignItem == YGAlignCenter) {
+ leadingCrossDim += remainingCrossDim / 2;
+ } else {
+ leadingCrossDim += remainingCrossDim;
+ }
+ }
+ // And we apply the position
+ child->setLayoutPosition(
+ child->getLayout().position[pos[crossAxis]] + totalLineCrossDim +
+ leadingCrossDim,
+ pos[crossAxis]);
+ }
+ }
+ }
+
+ totalLineCrossDim += collectedFlexItemsValues.crossDim;
+ maxLineMainDim =
+ YGFloatMax(maxLineMainDim, collectedFlexItemsValues.mainDim);
+ }
+
+ // STEP 8: MULTI-LINE CONTENT ALIGNMENT
+ // currentLead stores the size of the cross dim
+ if (performLayout && (lineCount > 1 || YGIsBaselineLayout(node))) {
+ float crossDimLead = 0;
+ float currentLead = leadingPaddingAndBorderCross;
+ if (!YGFloatIsUndefined(availableInnerCrossDim)) {
+ const float remainingAlignContentDim =
+ availableInnerCrossDim - totalLineCrossDim;
+ switch (node->getStyle().alignContent) {
+ case YGAlignFlexEnd:
+ currentLead += remainingAlignContentDim;
+ break;
+ case YGAlignCenter:
+ currentLead += remainingAlignContentDim / 2;
+ break;
+ case YGAlignStretch:
+ if (availableInnerCrossDim > totalLineCrossDim) {
+ crossDimLead = remainingAlignContentDim / lineCount;
+ }
+ break;
+ case YGAlignSpaceAround:
+ if (availableInnerCrossDim > totalLineCrossDim) {
+ currentLead += remainingAlignContentDim / (2 * lineCount);
+ if (lineCount > 1) {
+ crossDimLead = remainingAlignContentDim / lineCount;
+ }
+ } else {
+ currentLead += remainingAlignContentDim / 2;
+ }
+ break;
+ case YGAlignSpaceBetween:
+ if (availableInnerCrossDim > totalLineCrossDim && lineCount > 1) {
+ crossDimLead = remainingAlignContentDim / (lineCount - 1);
+ }
+ break;
+ case YGAlignAuto:
+ case YGAlignFlexStart:
+ case YGAlignBaseline:
+ break;
+ }
+ }
+ uint32_t endIndex = 0;
+ for (uint32_t i = 0; i < lineCount; i++) {
+ const uint32_t startIndex = endIndex;
+ uint32_t ii;
+
+ // compute the line's height and find the endIndex
+ float lineHeight = 0;
+ float maxAscentForCurrentLine = 0;
+ float maxDescentForCurrentLine = 0;
+ for (ii = startIndex; ii < childCount; ii++) {
+ const YGNodeRef child = node->getChild(ii);
+ if (child->getStyle().display == YGDisplayNone) {
+ continue;
+ }
+ if (child->getStyle().positionType == YGPositionTypeRelative) {
+ if (child->getLineIndex() != i) {
+ break;
+ }
+ if (YGNodeIsLayoutDimDefined(child, crossAxis)) {
+ lineHeight = YGFloatMax(
+ lineHeight,
+ child->getLayout().measuredDimensions[dim[crossAxis]] +
+ YGUnwrapFloatOptional(child->getMarginForAxis(
+ crossAxis, availableInnerWidth)));
+ }
+ if (YGNodeAlignItem(node, child) == YGAlignBaseline) {
+ const float ascent = YGBaseline(child) +
+ YGUnwrapFloatOptional(child->getLeadingMargin(
+ YGFlexDirectionColumn, availableInnerWidth));
+ const float descent =
+ child->getLayout().measuredDimensions[YGDimensionHeight] +
+ YGUnwrapFloatOptional(child->getMarginForAxis(
+ YGFlexDirectionColumn, availableInnerWidth)) -
+ ascent;
+ maxAscentForCurrentLine =
+ YGFloatMax(maxAscentForCurrentLine, ascent);
+ maxDescentForCurrentLine =
+ YGFloatMax(maxDescentForCurrentLine, descent);
+ lineHeight = YGFloatMax(
+ lineHeight, maxAscentForCurrentLine + maxDescentForCurrentLine);
+ }
+ }
+ }
+ endIndex = ii;
+ lineHeight += crossDimLead;
+
+ if (performLayout) {
+ for (ii = startIndex; ii < endIndex; ii++) {
+ const YGNodeRef child = node->getChild(ii);
+ if (child->getStyle().display == YGDisplayNone) {
+ continue;
+ }
+ if (child->getStyle().positionType == YGPositionTypeRelative) {
+ switch (YGNodeAlignItem(node, child)) {
+ case YGAlignFlexStart: {
+ child->setLayoutPosition(
+ currentLead +
+ YGUnwrapFloatOptional(child->getLeadingMargin(
+ crossAxis, availableInnerWidth)),
+ pos[crossAxis]);
+ break;
+ }
+ case YGAlignFlexEnd: {
+ child->setLayoutPosition(
+ currentLead + lineHeight -
+ YGUnwrapFloatOptional(child->getTrailingMargin(
+ crossAxis, availableInnerWidth)) -
+ child->getLayout().measuredDimensions[dim[crossAxis]],
+ pos[crossAxis]);
+ break;
+ }
+ case YGAlignCenter: {
+ float childHeight =
+ child->getLayout().measuredDimensions[dim[crossAxis]];
+
+ child->setLayoutPosition(
+ currentLead + (lineHeight - childHeight) / 2,
+ pos[crossAxis]);
+ break;
+ }
+ case YGAlignStretch: {
+ child->setLayoutPosition(
+ currentLead +
+ YGUnwrapFloatOptional(child->getLeadingMargin(
+ crossAxis, availableInnerWidth)),
+ pos[crossAxis]);
+
+ // Remeasure child with the line height as it as been only
+ // measured with the owners height yet.
+ if (!YGNodeIsStyleDimDefined(
+ child, crossAxis, availableInnerCrossDim)) {
+ const float childWidth = isMainAxisRow
+ ? (child->getLayout()
+ .measuredDimensions[YGDimensionWidth] +
+ YGUnwrapFloatOptional(child->getMarginForAxis(
+ mainAxis, availableInnerWidth)))
+ : lineHeight;
+
+ const float childHeight = !isMainAxisRow
+ ? (child->getLayout()
+ .measuredDimensions[YGDimensionHeight] +
+ YGUnwrapFloatOptional(child->getMarginForAxis(
+ crossAxis, availableInnerWidth)))
+ : lineHeight;
+
+ if (!(YGFloatsEqual(
+ childWidth,
+ child->getLayout()
+ .measuredDimensions[YGDimensionWidth]) &&
+ YGFloatsEqual(
+ childHeight,
+ child->getLayout()
+ .measuredDimensions[YGDimensionHeight]))) {
+ YGLayoutNodeInternal(
+ child,
+ childWidth,
+ childHeight,
+ direction,
+ YGMeasureModeExactly,
+ YGMeasureModeExactly,
+ availableInnerWidth,
+ availableInnerHeight,
+ true,
+ "multiline-stretch",
+ config);
+ }
+ }
+ break;
+ }
+ case YGAlignBaseline: {
+ child->setLayoutPosition(
+ currentLead + maxAscentForCurrentLine - YGBaseline(child) +
+ YGUnwrapFloatOptional(child->getLeadingPosition(
+ YGFlexDirectionColumn, availableInnerCrossDim)),
+ YGEdgeTop);
+
+ break;
+ }
+ case YGAlignAuto:
+ case YGAlignSpaceBetween:
+ case YGAlignSpaceAround:
+ break;
+ }
+ }
+ }
+ }
+ currentLead += lineHeight;
+ }
+ }
+
+ // STEP 9: COMPUTING FINAL DIMENSIONS
+
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionRow,
+ availableWidth - marginAxisRow,
+ ownerWidth,
+ ownerWidth),
+ YGDimensionWidth);
+
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ YGFlexDirectionColumn,
+ availableHeight - marginAxisColumn,
+ ownerHeight,
+ ownerWidth),
+ YGDimensionHeight);
+
+ // If the user didn't specify a width or height for the node, set the
+ // dimensions based on the children.
+ if (measureModeMainDim == YGMeasureModeUndefined ||
+ (node->getStyle().overflow != YGOverflowScroll &&
+ measureModeMainDim == YGMeasureModeAtMost)) {
+ // Clamp the size to the min/max size, if specified, and make sure it
+ // doesn't go below the padding and border amount.
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node, mainAxis, maxLineMainDim, mainAxisownerSize, ownerWidth),
+ dim[mainAxis]);
+
+ } else if (
+ measureModeMainDim == YGMeasureModeAtMost &&
+ node->getStyle().overflow == YGOverflowScroll) {
+ node->setLayoutMeasuredDimension(
+ YGFloatMax(
+ YGFloatMin(
+ availableInnerMainDim + paddingAndBorderAxisMain,
+ YGUnwrapFloatOptional(YGNodeBoundAxisWithinMinAndMax(
+ node, mainAxis, maxLineMainDim, mainAxisownerSize))),
+ paddingAndBorderAxisMain),
+ dim[mainAxis]);
+ }
+
+ if (measureModeCrossDim == YGMeasureModeUndefined ||
+ (node->getStyle().overflow != YGOverflowScroll &&
+ measureModeCrossDim == YGMeasureModeAtMost)) {
+ // Clamp the size to the min/max size, if specified, and make sure it
+ // doesn't go below the padding and border amount.
+ node->setLayoutMeasuredDimension(
+ YGNodeBoundAxis(
+ node,
+ crossAxis,
+ totalLineCrossDim + paddingAndBorderAxisCross,
+ crossAxisownerSize,
+ ownerWidth),
+ dim[crossAxis]);
+
+ } else if (
+ measureModeCrossDim == YGMeasureModeAtMost &&
+ node->getStyle().overflow == YGOverflowScroll) {
+ node->setLayoutMeasuredDimension(
+ YGFloatMax(
+ YGFloatMin(
+ availableInnerCrossDim + paddingAndBorderAxisCross,
+ YGUnwrapFloatOptional(YGNodeBoundAxisWithinMinAndMax(
+ node,
+ crossAxis,
+ totalLineCrossDim + paddingAndBorderAxisCross,
+ crossAxisownerSize))),
+ paddingAndBorderAxisCross),
+ dim[crossAxis]);
+ }
+
+ // As we only wrapped in normal direction yet, we need to reverse the
+ // positions on wrap-reverse.
+ if (performLayout && node->getStyle().flexWrap == YGWrapWrapReverse) {
+ for (uint32_t i = 0; i < childCount; i++) {
+ const YGNodeRef child = YGNodeGetChild(node, i);
+ if (child->getStyle().positionType == YGPositionTypeRelative) {
+ child->setLayoutPosition(
+ node->getLayout().measuredDimensions[dim[crossAxis]] -
+ child->getLayout().position[pos[crossAxis]] -
+ child->getLayout().measuredDimensions[dim[crossAxis]],
+ pos[crossAxis]);
+ }
+ }
+ }
+
+ if (performLayout) {
+ // STEP 10: SIZING AND POSITIONING ABSOLUTE CHILDREN
+ for (auto child : node->getChildren()) {
+ if (child->getStyle().positionType != YGPositionTypeAbsolute) {
+ continue;
+ }
+ YGNodeAbsoluteLayoutChild(
+ node,
+ child,
+ availableInnerWidth,
+ isMainAxisRow ? measureModeMainDim : measureModeCrossDim,
+ availableInnerHeight,
+ direction,
+ config);
+ }
+
+ // STEP 11: SETTING TRAILING POSITIONS FOR CHILDREN
+ const bool needsMainTrailingPos = mainAxis == YGFlexDirectionRowReverse ||
+ mainAxis == YGFlexDirectionColumnReverse;
+ const bool needsCrossTrailingPos = crossAxis == YGFlexDirectionRowReverse ||
+ crossAxis == YGFlexDirectionColumnReverse;
+
+ // Set trailing position if necessary.
+ if (needsMainTrailingPos || needsCrossTrailingPos) {
+ for (uint32_t i = 0; i < childCount; i++) {
+ const YGNodeRef child = node->getChild(i);
+ if (child->getStyle().display == YGDisplayNone) {
+ continue;
+ }
+ if (needsMainTrailingPos) {
+ YGNodeSetChildTrailingPosition(node, child, mainAxis);
+ }
+
+ if (needsCrossTrailingPos) {
+ YGNodeSetChildTrailingPosition(node, child, crossAxis);
+ }
+ }
+ }
+ }
+}
+
+uint32_t gDepth = 0;
+bool gPrintChanges = false;
+bool gPrintSkips = false;
+
+static const char* spacer =
+ " ";
+
+static const char* YGSpacer(const unsigned long level) {
+ const size_t spacerLen = strlen(spacer);
+ if (level > spacerLen) {
+ return &spacer[0];
+ } else {
+ return &spacer[spacerLen - level];
+ }
+}
+
+static const char* YGMeasureModeName(
+ const YGMeasureMode mode,
+ const bool performLayout) {
+ const char* kMeasureModeNames[YGMeasureModeCount] = {
+ "UNDEFINED", "EXACTLY", "AT_MOST"};
+ const char* kLayoutModeNames[YGMeasureModeCount] = {"LAY_UNDEFINED",
+ "LAY_EXACTLY",
+ "LAY_AT_"
+ "MOST"};
+
+ if (mode >= YGMeasureModeCount) {
+ return "";
+ }
+
+ return performLayout ? kLayoutModeNames[mode] : kMeasureModeNames[mode];
+}
+
+static inline bool YGMeasureModeSizeIsExactAndMatchesOldMeasuredSize(
+ YGMeasureMode sizeMode,
+ float size,
+ float lastComputedSize) {
+ return sizeMode == YGMeasureModeExactly &&
+ YGFloatsEqual(size, lastComputedSize);
+}
+
+static inline bool YGMeasureModeOldSizeIsUnspecifiedAndStillFits(
+ YGMeasureMode sizeMode,
+ float size,
+ YGMeasureMode lastSizeMode,
+ float lastComputedSize) {
+ return sizeMode == YGMeasureModeAtMost &&
+ lastSizeMode == YGMeasureModeUndefined &&
+ (size >= lastComputedSize || YGFloatsEqual(size, lastComputedSize));
+}
+
+static inline bool YGMeasureModeNewMeasureSizeIsStricterAndStillValid(
+ YGMeasureMode sizeMode,
+ float size,
+ YGMeasureMode lastSizeMode,
+ float lastSize,
+ float lastComputedSize) {
+ return lastSizeMode == YGMeasureModeAtMost &&
+ sizeMode == YGMeasureModeAtMost && !YGFloatIsUndefined(lastSize) &&
+ !YGFloatIsUndefined(size) && !YGFloatIsUndefined(lastComputedSize) &&
+ lastSize > size &&
+ (lastComputedSize <= size || YGFloatsEqual(size, lastComputedSize));
+}
+
+float YGRoundValueToPixelGrid(
+ const float value,
+ const float pointScaleFactor,
+ const bool forceCeil,
+ const bool forceFloor) {
+ float scaledValue = value * pointScaleFactor;
+ float fractial = fmodf(scaledValue, 1.0f);
+ if (YGFloatsEqual(fractial, 0)) {
+ // First we check if the value is already rounded
+ scaledValue = scaledValue - fractial;
+ } else if (YGFloatsEqual(fractial, 1.0f)) {
+ scaledValue = scaledValue - fractial + 1.0f;
+ } else if (forceCeil) {
+ // Next we check if we need to use forced rounding
+ scaledValue = scaledValue - fractial + 1.0f;
+ } else if (forceFloor) {
+ scaledValue = scaledValue - fractial;
+ } else {
+ // Finally we just round the value
+ scaledValue = scaledValue - fractial +
+ (!YGFloatIsUndefined(fractial) &&
+ (fractial > 0.5f || YGFloatsEqual(fractial, 0.5f))
+ ? 1.0f
+ : 0.0f);
+ }
+ return (YGFloatIsUndefined(scaledValue) ||
+ YGFloatIsUndefined(pointScaleFactor))
+ ? YGUndefined
+ : scaledValue / pointScaleFactor;
+}
+
+bool YGNodeCanUseCachedMeasurement(
+ const YGMeasureMode widthMode,
+ const float width,
+ const YGMeasureMode heightMode,
+ const float height,
+ const YGMeasureMode lastWidthMode,
+ const float lastWidth,
+ const YGMeasureMode lastHeightMode,
+ const float lastHeight,
+ const float lastComputedWidth,
+ const float lastComputedHeight,
+ const float marginRow,
+ const float marginColumn,
+ const YGConfigRef config) {
+ if ((!YGFloatIsUndefined(lastComputedHeight) && lastComputedHeight < 0) ||
+ (!YGFloatIsUndefined(lastComputedWidth) && lastComputedWidth < 0)) {
+ return false;
+ }
+ bool useRoundedComparison =
+ config != nullptr && config->pointScaleFactor != 0;
+ const float effectiveWidth = useRoundedComparison
+ ? YGRoundValueToPixelGrid(width, config->pointScaleFactor, false, false)
+ : width;
+ const float effectiveHeight = useRoundedComparison
+ ? YGRoundValueToPixelGrid(height, config->pointScaleFactor, false, false)
+ : height;
+ const float effectiveLastWidth = useRoundedComparison
+ ? YGRoundValueToPixelGrid(
+ lastWidth, config->pointScaleFactor, false, false)
+ : lastWidth;
+ const float effectiveLastHeight = useRoundedComparison
+ ? YGRoundValueToPixelGrid(
+ lastHeight, config->pointScaleFactor, false, false)
+ : lastHeight;
+
+ const bool hasSameWidthSpec = lastWidthMode == widthMode &&
+ YGFloatsEqual(effectiveLastWidth, effectiveWidth);
+ const bool hasSameHeightSpec = lastHeightMode == heightMode &&
+ YGFloatsEqual(effectiveLastHeight, effectiveHeight);
+
+ const bool widthIsCompatible =
+ hasSameWidthSpec ||
+ YGMeasureModeSizeIsExactAndMatchesOldMeasuredSize(
+ widthMode, width - marginRow, lastComputedWidth) ||
+ YGMeasureModeOldSizeIsUnspecifiedAndStillFits(
+ widthMode, width - marginRow, lastWidthMode, lastComputedWidth) ||
+ YGMeasureModeNewMeasureSizeIsStricterAndStillValid(
+ widthMode,
+ width - marginRow,
+ lastWidthMode,
+ lastWidth,
+ lastComputedWidth);
+
+ const bool heightIsCompatible =
+ hasSameHeightSpec ||
+ YGMeasureModeSizeIsExactAndMatchesOldMeasuredSize(
+ heightMode, height - marginColumn, lastComputedHeight) ||
+ YGMeasureModeOldSizeIsUnspecifiedAndStillFits(
+ heightMode,
+ height - marginColumn,
+ lastHeightMode,
+ lastComputedHeight) ||
+ YGMeasureModeNewMeasureSizeIsStricterAndStillValid(
+ heightMode,
+ height - marginColumn,
+ lastHeightMode,
+ lastHeight,
+ lastComputedHeight);
+
+ return widthIsCompatible && heightIsCompatible;
+}
+
+//
+// This is a wrapper around the YGNodelayoutImpl function. It determines
+// whether the layout request is redundant and can be skipped.
+//
+// Parameters:
+// Input parameters are the same as YGNodelayoutImpl (see above)
+// Return parameter is true if layout was performed, false if skipped
+//
+bool YGLayoutNodeInternal(
+ const YGNodeRef node,
+ const float availableWidth,
+ const float availableHeight,
+ const YGDirection ownerDirection,
+ const YGMeasureMode widthMeasureMode,
+ const YGMeasureMode heightMeasureMode,
+ const float ownerWidth,
+ const float ownerHeight,
+ const bool performLayout,
+ const char* reason,
+ const YGConfigRef config) {
+ YGLayout* layout = &node->getLayout();
+
+ gDepth++;
+
+ const bool needToVisitNode =
+ (node->isDirty() && layout->generationCount != gCurrentGenerationCount) ||
+ layout->lastOwnerDirection != ownerDirection;
+
+ if (needToVisitNode) {
+ // Invalidate the cached results.
+ layout->nextCachedMeasurementsIndex = 0;
+ layout->cachedLayout.widthMeasureMode = (YGMeasureMode)-1;
+ layout->cachedLayout.heightMeasureMode = (YGMeasureMode)-1;
+ layout->cachedLayout.computedWidth = -1;
+ layout->cachedLayout.computedHeight = -1;
+ }
+
+ YGCachedMeasurement* cachedResults = nullptr;
+
+ // Determine whether the results are already cached. We maintain a separate
+ // cache for layouts and measurements. A layout operation modifies the
+ // positions
+ // and dimensions for nodes in the subtree. The algorithm assumes that each
+ // node
+ // gets layed out a maximum of one time per tree layout, but multiple
+ // measurements
+ // may be required to resolve all of the flex dimensions.
+ // We handle nodes with measure functions specially here because they are the
+ // most
+ // expensive to measure, so it's worth avoiding redundant measurements if at
+ // all possible.
+ if (node->getMeasure() != nullptr) {
+ const float marginAxisRow = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionRow, ownerWidth));
+ const float marginAxisColumn = YGUnwrapFloatOptional(
+ node->getMarginForAxis(YGFlexDirectionColumn, ownerWidth));
+
+ // First, try to use the layout cache.
+ if (YGNodeCanUseCachedMeasurement(
+ widthMeasureMode,
+ availableWidth,
+ heightMeasureMode,
+ availableHeight,
+ layout->cachedLayout.widthMeasureMode,
+ layout->cachedLayout.availableWidth,
+ layout->cachedLayout.heightMeasureMode,
+ layout->cachedLayout.availableHeight,
+ layout->cachedLayout.computedWidth,
+ layout->cachedLayout.computedHeight,
+ marginAxisRow,
+ marginAxisColumn,
+ config)) {
+ cachedResults = &layout->cachedLayout;
+ } else {
+ // Try to use the measurement cache.
+ for (uint32_t i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
+ if (YGNodeCanUseCachedMeasurement(
+ widthMeasureMode,
+ availableWidth,
+ heightMeasureMode,
+ availableHeight,
+ layout->cachedMeasurements[i].widthMeasureMode,
+ layout->cachedMeasurements[i].availableWidth,
+ layout->cachedMeasurements[i].heightMeasureMode,
+ layout->cachedMeasurements[i].availableHeight,
+ layout->cachedMeasurements[i].computedWidth,
+ layout->cachedMeasurements[i].computedHeight,
+ marginAxisRow,
+ marginAxisColumn,
+ config)) {
+ cachedResults = &layout->cachedMeasurements[i];
+ break;
+ }
+ }
+ }
+ } else if (performLayout) {
+ if (YGFloatsEqual(layout->cachedLayout.availableWidth, availableWidth) &&
+ YGFloatsEqual(layout->cachedLayout.availableHeight, availableHeight) &&
+ layout->cachedLayout.widthMeasureMode == widthMeasureMode &&
+ layout->cachedLayout.heightMeasureMode == heightMeasureMode) {
+ cachedResults = &layout->cachedLayout;
+ }
+ } else {
+ for (uint32_t i = 0; i < layout->nextCachedMeasurementsIndex; i++) {
+ if (YGFloatsEqual(
+ layout->cachedMeasurements[i].availableWidth, availableWidth) &&
+ YGFloatsEqual(
+ layout->cachedMeasurements[i].availableHeight, availableHeight) &&
+ layout->cachedMeasurements[i].widthMeasureMode == widthMeasureMode &&
+ layout->cachedMeasurements[i].heightMeasureMode ==
+ heightMeasureMode) {
+ cachedResults = &layout->cachedMeasurements[i];
+ break;
+ }
+ }
+ }
+
+ if (!needToVisitNode && cachedResults != nullptr) {
+ layout->measuredDimensions[YGDimensionWidth] = cachedResults->computedWidth;
+ layout->measuredDimensions[YGDimensionHeight] =
+ cachedResults->computedHeight;
+
+ if (gPrintChanges && gPrintSkips) {
+ YGLog(
+ node,
+ YGLogLevelVerbose,
+ "%s%d.{[skipped] ",
+ YGSpacer(gDepth),
+ gDepth);
+ if (node->getPrintFunc() != nullptr) {
+ node->getPrintFunc()(node);
+ }
+ YGLog(
+ node,
+ YGLogLevelVerbose,
+ "wm: %s, hm: %s, aw: %f ah: %f => d: (%f, %f) %s\n",
+ YGMeasureModeName(widthMeasureMode, performLayout),
+ YGMeasureModeName(heightMeasureMode, performLayout),
+ availableWidth,
+ availableHeight,
+ cachedResults->computedWidth,
+ cachedResults->computedHeight,
+ reason);
+ }
+ } else {
+ if (gPrintChanges) {
+ YGLog(
+ node,
+ YGLogLevelVerbose,
+ "%s%d.{%s",
+ YGSpacer(gDepth),
+ gDepth,
+ needToVisitNode ? "*" : "");
+ if (node->getPrintFunc() != nullptr) {
+ node->getPrintFunc()(node);
+ }
+ YGLog(
+ node,
+ YGLogLevelVerbose,
+ "wm: %s, hm: %s, aw: %f ah: %f %s\n",
+ YGMeasureModeName(widthMeasureMode, performLayout),
+ YGMeasureModeName(heightMeasureMode, performLayout),
+ availableWidth,
+ availableHeight,
+ reason);
+ }
+
+ YGNodelayoutImpl(
+ node,
+ availableWidth,
+ availableHeight,
+ ownerDirection,
+ widthMeasureMode,
+ heightMeasureMode,
+ ownerWidth,
+ ownerHeight,
+ performLayout,
+ config);
+
+ if (gPrintChanges) {
+ YGLog(
+ node,
+ YGLogLevelVerbose,
+ "%s%d.}%s",
+ YGSpacer(gDepth),
+ gDepth,
+ needToVisitNode ? "*" : "");
+ if (node->getPrintFunc() != nullptr) {
+ node->getPrintFunc()(node);
+ }
+ YGLog(
+ node,
+ YGLogLevelVerbose,
+ "wm: %s, hm: %s, d: (%f, %f) %s\n",
+ YGMeasureModeName(widthMeasureMode, performLayout),
+ YGMeasureModeName(heightMeasureMode, performLayout),
+ layout->measuredDimensions[YGDimensionWidth],
+ layout->measuredDimensions[YGDimensionHeight],
+ reason);
+ }
+
+ layout->lastOwnerDirection = ownerDirection;
+
+ if (cachedResults == nullptr) {
+ if (layout->nextCachedMeasurementsIndex == YG_MAX_CACHED_RESULT_COUNT) {
+ if (gPrintChanges) {
+ YGLog(node, YGLogLevelVerbose, "Out of cache entries!\n");
+ }
+ layout->nextCachedMeasurementsIndex = 0;
+ }
+
+ YGCachedMeasurement* newCacheEntry;
+ if (performLayout) {
+ // Use the single layout cache entry.
+ newCacheEntry = &layout->cachedLayout;
+ } else {
+ // Allocate a new measurement cache entry.
+ newCacheEntry =
+ &layout->cachedMeasurements[layout->nextCachedMeasurementsIndex];
+ layout->nextCachedMeasurementsIndex++;
+ }
+
+ newCacheEntry->availableWidth = availableWidth;
+ newCacheEntry->availableHeight = availableHeight;
+ newCacheEntry->widthMeasureMode = widthMeasureMode;
+ newCacheEntry->heightMeasureMode = heightMeasureMode;
+ newCacheEntry->computedWidth =
+ layout->measuredDimensions[YGDimensionWidth];
+ newCacheEntry->computedHeight =
+ layout->measuredDimensions[YGDimensionHeight];
+ }
+ }
+
+ if (performLayout) {
+ node->setLayoutDimension(
+ node->getLayout().measuredDimensions[YGDimensionWidth],
+ YGDimensionWidth);
+ node->setLayoutDimension(
+ node->getLayout().measuredDimensions[YGDimensionHeight],
+ YGDimensionHeight);
+
+ node->setHasNewLayout(true);
+ node->setDirty(false);
+ }
+
+ gDepth--;
+ layout->generationCount = gCurrentGenerationCount;
+ return (needToVisitNode || cachedResults == nullptr);
+}
+
+void YGConfigSetPointScaleFactor(
+ const YGConfigRef config,
+ const float pixelsInPoint) {
+ YGAssertWithConfig(
+ config,
+ pixelsInPoint >= 0.0f,
+ "Scale factor should not be less than zero");
+
+ // We store points for Pixel as we will use it for rounding
+ if (pixelsInPoint == 0.0f) {
+ // Zero is used to skip rounding
+ config->pointScaleFactor = 0.0f;
+ } else {
+ config->pointScaleFactor = pixelsInPoint;
+ }
+}
+
+static void YGRoundToPixelGrid(
+ const YGNodeRef node,
+ const float pointScaleFactor,
+ const float absoluteLeft,
+ const float absoluteTop) {
+ if (pointScaleFactor == 0.0f) {
+ return;
+ }
+
+ const float nodeLeft = node->getLayout().position[YGEdgeLeft];
+ const float nodeTop = node->getLayout().position[YGEdgeTop];
+
+ const float nodeWidth = node->getLayout().dimensions[YGDimensionWidth];
+ const float nodeHeight = node->getLayout().dimensions[YGDimensionHeight];
+
+ const float absoluteNodeLeft = absoluteLeft + nodeLeft;
+ const float absoluteNodeTop = absoluteTop + nodeTop;
+
+ const float absoluteNodeRight = absoluteNodeLeft + nodeWidth;
+ const float absoluteNodeBottom = absoluteNodeTop + nodeHeight;
+
+ // If a node has a custom measure function we never want to round down its
+ // size as this could lead to unwanted text truncation.
+ const bool textRounding = node->getNodeType() == YGNodeTypeText;
+
+ node->setLayoutPosition(
+ YGRoundValueToPixelGrid(nodeLeft, pointScaleFactor, false, textRounding),
+ YGEdgeLeft);
+
+ node->setLayoutPosition(
+ YGRoundValueToPixelGrid(nodeTop, pointScaleFactor, false, textRounding),
+ YGEdgeTop);
+
+ // We multiply dimension by scale factor and if the result is close to the
+ // whole number, we don't have any fraction To verify if the result is close
+ // to whole number we want to check both floor and ceil numbers
+ const bool hasFractionalWidth =
+ !YGFloatsEqual(fmodf(nodeWidth * pointScaleFactor, 1.0), 0) &&
+ !YGFloatsEqual(fmodf(nodeWidth * pointScaleFactor, 1.0), 1.0);
+ const bool hasFractionalHeight =
+ !YGFloatsEqual(fmodf(nodeHeight * pointScaleFactor, 1.0), 0) &&
+ !YGFloatsEqual(fmodf(nodeHeight * pointScaleFactor, 1.0), 1.0);
+
+ node->setLayoutDimension(
+ YGRoundValueToPixelGrid(
+ absoluteNodeRight,
+ pointScaleFactor,
+ (textRounding && hasFractionalWidth),
+ (textRounding && !hasFractionalWidth)) -
+ YGRoundValueToPixelGrid(
+ absoluteNodeLeft, pointScaleFactor, false, textRounding),
+ YGDimensionWidth);
+
+ node->setLayoutDimension(
+ YGRoundValueToPixelGrid(
+ absoluteNodeBottom,
+ pointScaleFactor,
+ (textRounding && hasFractionalHeight),
+ (textRounding && !hasFractionalHeight)) -
+ YGRoundValueToPixelGrid(
+ absoluteNodeTop, pointScaleFactor, false, textRounding),
+ YGDimensionHeight);
+
+ const uint32_t childCount = YGNodeGetChildCount(node);
+ for (uint32_t i = 0; i < childCount; i++) {
+ YGRoundToPixelGrid(
+ YGNodeGetChild(node, i),
+ pointScaleFactor,
+ absoluteNodeLeft,
+ absoluteNodeTop);
+ }
+}
+
+void YGNodeCalculateLayout(
+ const YGNodeRef node,
+ const float ownerWidth,
+ const float ownerHeight,
+ const YGDirection ownerDirection) {
+ // Increment the generation count. This will force the recursive routine to
+ // visit
+ // all dirty nodes at least once. Subsequent visits will be skipped if the
+ // input
+ // parameters don't change.
+ gCurrentGenerationCount++;
+ node->resolveDimension();
+ float width = YGUndefined;
+ YGMeasureMode widthMeasureMode = YGMeasureModeUndefined;
+ if (YGNodeIsStyleDimDefined(node, YGFlexDirectionRow, ownerWidth)) {
+ width = YGUnwrapFloatOptional(
+ YGResolveValue(
+ node->getResolvedDimension(dim[YGFlexDirectionRow]), ownerWidth) +
+ node->getMarginForAxis(YGFlexDirectionRow, ownerWidth));
+ widthMeasureMode = YGMeasureModeExactly;
+ } else if (!YGResolveValue(
+ node->getStyle().maxDimensions[YGDimensionWidth], ownerWidth)
+ .isUndefined()) {
+ width = YGUnwrapFloatOptional(YGResolveValue(
+ node->getStyle().maxDimensions[YGDimensionWidth], ownerWidth));
+ widthMeasureMode = YGMeasureModeAtMost;
+ } else {
+ width = ownerWidth;
+ widthMeasureMode = YGFloatIsUndefined(width) ? YGMeasureModeUndefined
+ : YGMeasureModeExactly;
+ }
+
+ float height = YGUndefined;
+ YGMeasureMode heightMeasureMode = YGMeasureModeUndefined;
+ if (YGNodeIsStyleDimDefined(node, YGFlexDirectionColumn, ownerHeight)) {
+ height = YGUnwrapFloatOptional(
+ YGResolveValue(
+ node->getResolvedDimension(dim[YGFlexDirectionColumn]),
+ ownerHeight) +
+ node->getMarginForAxis(YGFlexDirectionColumn, ownerWidth));
+ heightMeasureMode = YGMeasureModeExactly;
+ } else if (!YGResolveValue(
+ node->getStyle().maxDimensions[YGDimensionHeight],
+ ownerHeight)
+ .isUndefined()) {
+ height = YGUnwrapFloatOptional(YGResolveValue(
+ node->getStyle().maxDimensions[YGDimensionHeight], ownerHeight));
+ heightMeasureMode = YGMeasureModeAtMost;
+ } else {
+ height = ownerHeight;
+ heightMeasureMode = YGFloatIsUndefined(height) ? YGMeasureModeUndefined
+ : YGMeasureModeExactly;
+ }
+ if (YGLayoutNodeInternal(
+ node,
+ width,
+ height,
+ ownerDirection,
+ widthMeasureMode,
+ heightMeasureMode,
+ ownerWidth,
+ ownerHeight,
+ true,
+ "initial",
+ node->getConfig())) {
+ node->setPosition(
+ node->getLayout().direction, ownerWidth, ownerHeight, ownerWidth);
+ YGRoundToPixelGrid(node, node->getConfig()->pointScaleFactor, 0.0f, 0.0f);
+
+ if (node->getConfig()->printTree) {
+ YGNodePrint(
+ node,
+ (YGPrintOptions)(
+ YGPrintOptionsLayout | YGPrintOptionsChildren |
+ YGPrintOptionsStyle));
+ }
+ }
+
+ // We want to get rid off `useLegacyStretchBehaviour` from YGConfig. But we
+ // aren't sure whether client's of yoga have gotten rid off this flag or not.
+ // So logging this in YGLayout would help to find out the call sites depending
+ // on this flag. This check would be removed once we are sure no one is
+ // dependent on this flag anymore. The flag
+ // `shouldDiffLayoutWithoutLegacyStretchBehaviour` in YGConfig will help to
+ // run experiments.
+ if (node->getConfig()->shouldDiffLayoutWithoutLegacyStretchBehaviour &&
+ node->didUseLegacyFlag()) {
+ const YGNodeRef originalNode = YGNodeDeepClone(node);
+ originalNode->resolveDimension();
+ // Recursively mark nodes as dirty
+ originalNode->markDirtyAndPropogateDownwards();
+ gCurrentGenerationCount++;
+ // Rerun the layout, and calculate the diff
+ originalNode->setAndPropogateUseLegacyFlag(false);
+ if (YGLayoutNodeInternal(
+ originalNode,
+ width,
+ height,
+ ownerDirection,
+ widthMeasureMode,
+ heightMeasureMode,
+ ownerWidth,
+ ownerHeight,
+ true,
+ "initial",
+ originalNode->getConfig())) {
+ originalNode->setPosition(
+ originalNode->getLayout().direction,
+ ownerWidth,
+ ownerHeight,
+ ownerWidth);
+ YGRoundToPixelGrid(
+ originalNode,
+ originalNode->getConfig()->pointScaleFactor,
+ 0.0f,
+ 0.0f);
+
+ // Set whether the two layouts are different or not.
+ node->setLayoutDoesLegacyFlagAffectsLayout(
+ !originalNode->isLayoutTreeEqualToNode(*node));
+
+ if (originalNode->getConfig()->printTree) {
+ YGNodePrint(
+ originalNode,
+ (YGPrintOptions)(
+ YGPrintOptionsLayout | YGPrintOptionsChildren |
+ YGPrintOptionsStyle));
+ }
+ }
+ YGConfigFreeRecursive(originalNode);
+ YGNodeFreeRecursive(originalNode);
+ }
+}
+
+void YGConfigSetLogger(const YGConfigRef config, YGLogger logger) {
+ if (logger != nullptr) {
+ config->logger = logger;
+ } else {
+#ifdef ANDROID
+ config->logger = &YGAndroidLog;
+#else
+ config->logger = &YGDefaultLog;
+#endif
+ }
+}
+
+void YGConfigSetShouldDiffLayoutWithoutLegacyStretchBehaviour(
+ const YGConfigRef config,
+ const bool shouldDiffLayout) {
+ config->shouldDiffLayoutWithoutLegacyStretchBehaviour = shouldDiffLayout;
+}
+
+static void YGVLog(
+ const YGConfigRef config,
+ const YGNodeRef node,
+ YGLogLevel level,
+ const char* format,
+ va_list args) {
+ const YGConfigRef logConfig =
+ config != nullptr ? config : YGConfigGetDefault();
+ logConfig->logger(logConfig, node, level, format, args);
+
+ if (level == YGLogLevelFatal) {
+ abort();
+ }
+}
+
+void YGLogWithConfig(
+ const YGConfigRef config,
+ YGLogLevel level,
+ const char* format,
+ ...) {
+ va_list args;
+ va_start(args, format);
+ YGVLog(config, nullptr, level, format, args);
+ va_end(args);
+}
+
+void YGLog(const YGNodeRef node, YGLogLevel level, const char* format, ...) {
+ va_list args;
+ va_start(args, format);
+ YGVLog(
+ node == nullptr ? nullptr : node->getConfig(), node, level, format, args);
+ va_end(args);
+}
+
+void YGAssert(const bool condition, const char* message) {
+ if (!condition) {
+ YGLog(nullptr, YGLogLevelFatal, "%s\n", message);
+ }
+}
+
+void YGAssertWithNode(
+ const YGNodeRef node,
+ const bool condition,
+ const char* message) {
+ if (!condition) {
+ YGLog(node, YGLogLevelFatal, "%s\n", message);
+ }
+}
+
+void YGAssertWithConfig(
+ const YGConfigRef config,
+ const bool condition,
+ const char* message) {
+ if (!condition) {
+ YGLogWithConfig(config, YGLogLevelFatal, "%s\n", message);
+ }
+}
+
+void YGConfigSetExperimentalFeatureEnabled(
+ const YGConfigRef config,
+ const YGExperimentalFeature feature,
+ const bool enabled) {
+ config->experimentalFeatures[feature] = enabled;
+}
+
+inline bool YGConfigIsExperimentalFeatureEnabled(
+ const YGConfigRef config,
+ const YGExperimentalFeature feature) {
+ return config->experimentalFeatures[feature];
+}
+
+void YGConfigSetUseWebDefaults(const YGConfigRef config, const bool enabled) {
+ config->useWebDefaults = enabled;
+}
+
+void YGConfigSetUseLegacyStretchBehaviour(
+ const YGConfigRef config,
+ const bool useLegacyStretchBehaviour) {
+ config->useLegacyStretchBehaviour = useLegacyStretchBehaviour;
+}
+
+bool YGConfigGetUseWebDefaults(const YGConfigRef config) {
+ return config->useWebDefaults;
+}
+
+void YGConfigSetContext(const YGConfigRef config, void* context) {
+ config->context = context;
+}
+
+void* YGConfigGetContext(const YGConfigRef config) {
+ return config->context;
+}
+
+void YGConfigSetCloneNodeFunc(
+ const YGConfigRef config,
+ const YGCloneNodeFunc callback) {
+ config->cloneNodeCallback = callback;
+}
+
+static void YGTraverseChildrenPreOrder(
+ const YGVector& children,
+ const std::function<void(YGNodeRef node)>& f) {
+ for (YGNodeRef node : children) {
+ f(node);
+ YGTraverseChildrenPreOrder(node->getChildren(), f);
+ }
+}
+
+void YGTraversePreOrder(
+ YGNodeRef const node,
+ std::function<void(YGNodeRef node)>&& f) {
+ if (!node) {
+ return;
+ }
+ f(node);
+ YGTraverseChildrenPreOrder(node->getChildren(), f);
+}
diff --git a/yoga/Yoga.h b/yoga/Yoga.h
index 060e43a..f15b4e4 100644..100755
--- a/yoga/Yoga.h
+++ b/yoga/Yoga.h
@@ -1,283 +1,462 @@
-/**
- * Copyright (c) 2014-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-#pragma once
-
-#include <assert.h>
-#include <math.h>
-#include <stdarg.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#ifndef __cplusplus
-#include <stdbool.h>
-#endif
-
-// Not defined in MSVC++
-#ifndef NAN
-static const unsigned long __nan[2] = {0xffffffff, 0x7fffffff};
-#define NAN (*(const float *) __nan)
-#endif
-
-#define YGUndefined NAN
-
-#include "YGEnums.h"
-#include "YGMacros.h"
-
-YG_EXTERN_C_BEGIN
-
-typedef struct YGSize {
- float width;
- float height;
-} YGSize;
-
-typedef struct YGValue {
- float value;
- YGUnit unit;
-} YGValue;
-
-static const YGValue YGValueUndefined = {YGUndefined, YGUnitUndefined};
-static const YGValue YGValueAuto = {YGUndefined, YGUnitAuto};
-
-typedef struct YGConfig *YGConfigRef;
-typedef struct YGNode *YGNodeRef;
-typedef YGSize (*YGMeasureFunc)(YGNodeRef node,
- float width,
- YGMeasureMode widthMode,
- float height,
- YGMeasureMode heightMode);
-typedef float (*YGBaselineFunc)(YGNodeRef node, const float width, const float height);
-typedef void (*YGPrintFunc)(YGNodeRef node);
-typedef int (*YGLogger)(const YGConfigRef config,
- const YGNodeRef node,
- YGLogLevel level,
- const char *format,
- va_list args);
-typedef void (*YGNodeClonedFunc)(YGNodeRef oldNode,
- YGNodeRef newNode,
- YGNodeRef parent,
- int childIndex);
-
-// YGNode
-WIN_EXPORT YGNodeRef YGNodeNew(void);
-WIN_EXPORT YGNodeRef YGNodeNewWithConfig(const YGConfigRef config);
-WIN_EXPORT YGNodeRef YGNodeClone(const YGNodeRef node);
-WIN_EXPORT void YGNodeFree(const YGNodeRef node);
-WIN_EXPORT void YGNodeFreeRecursive(const YGNodeRef node);
-WIN_EXPORT void YGNodeReset(const YGNodeRef node);
-WIN_EXPORT int32_t YGNodeGetInstanceCount(void);
-
-WIN_EXPORT void YGNodeInsertChild(const YGNodeRef node,
- const YGNodeRef child,
- const uint32_t index);
-WIN_EXPORT void YGNodeRemoveChild(const YGNodeRef node, const YGNodeRef child);
-WIN_EXPORT void YGNodeRemoveAllChildren(const YGNodeRef node);
-WIN_EXPORT YGNodeRef YGNodeGetChild(const YGNodeRef node, const uint32_t index);
-WIN_EXPORT YGNodeRef YGNodeGetParent(const YGNodeRef node);
-WIN_EXPORT uint32_t YGNodeGetChildCount(const YGNodeRef node);
-
-WIN_EXPORT void YGNodeCalculateLayout(const YGNodeRef node,
- const float availableWidth,
- const float availableHeight,
- const YGDirection parentDirection);
-
-// Mark a node as dirty. Only valid for nodes with a custom measure function
-// set.
-// YG knows when to mark all other nodes as dirty but because nodes with
-// measure functions
-// depends on information not known to YG they must perform this dirty
-// marking manually.
-WIN_EXPORT void YGNodeMarkDirty(const YGNodeRef node);
-WIN_EXPORT bool YGNodeIsDirty(const YGNodeRef node);
-
-WIN_EXPORT void YGNodePrint(const YGNodeRef node, const YGPrintOptions options);
-
-WIN_EXPORT bool YGFloatIsUndefined(const float value);
-
-WIN_EXPORT bool YGNodeCanUseCachedMeasurement(const YGMeasureMode widthMode,
- const float width,
- const YGMeasureMode heightMode,
- const float height,
- const YGMeasureMode lastWidthMode,
- const float lastWidth,
- const YGMeasureMode lastHeightMode,
- const float lastHeight,
- const float lastComputedWidth,
- const float lastComputedHeight,
- const float marginRow,
- const float marginColumn,
- const YGConfigRef config);
-
-WIN_EXPORT void YGNodeCopyStyle(const YGNodeRef dstNode, const YGNodeRef srcNode);
-
-#define YG_NODE_PROPERTY(type, name, paramName) \
- WIN_EXPORT void YGNodeSet##name(const YGNodeRef node, type paramName); \
- WIN_EXPORT type YGNodeGet##name(const YGNodeRef node);
-
-#define YG_NODE_STYLE_PROPERTY(type, name, paramName) \
- WIN_EXPORT void YGNodeStyleSet##name(const YGNodeRef node, const type paramName); \
- WIN_EXPORT type YGNodeStyleGet##name(const YGNodeRef node);
-
-#define YG_NODE_STYLE_PROPERTY_UNIT(type, name, paramName) \
- WIN_EXPORT void YGNodeStyleSet##name(const YGNodeRef node, const float paramName); \
- WIN_EXPORT void YGNodeStyleSet##name##Percent(const YGNodeRef node, const float paramName); \
- WIN_EXPORT type YGNodeStyleGet##name(const YGNodeRef node);
-
-#define YG_NODE_STYLE_PROPERTY_UNIT_AUTO(type, name, paramName) \
- YG_NODE_STYLE_PROPERTY_UNIT(type, name, paramName) \
- WIN_EXPORT void YGNodeStyleSet##name##Auto(const YGNodeRef node);
-
-#define YG_NODE_STYLE_EDGE_PROPERTY(type, name, paramName) \
- WIN_EXPORT void YGNodeStyleSet##name(const YGNodeRef node, \
- const YGEdge edge, \
- const type paramName); \
- WIN_EXPORT type YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge);
-
-#define YG_NODE_STYLE_EDGE_PROPERTY_UNIT(type, name, paramName) \
- WIN_EXPORT void YGNodeStyleSet##name(const YGNodeRef node, \
- const YGEdge edge, \
- const float paramName); \
- WIN_EXPORT void YGNodeStyleSet##name##Percent(const YGNodeRef node, \
- const YGEdge edge, \
- const float paramName); \
- WIN_EXPORT WIN_STRUCT(type) YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge);
-
-#define YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO(type, name) \
- WIN_EXPORT void YGNodeStyleSet##name##Auto(const YGNodeRef node, const YGEdge edge);
-
-#define YG_NODE_LAYOUT_PROPERTY(type, name) \
- WIN_EXPORT type YGNodeLayoutGet##name(const YGNodeRef node);
-
-#define YG_NODE_LAYOUT_EDGE_PROPERTY(type, name) \
- WIN_EXPORT type YGNodeLayoutGet##name(const YGNodeRef node, const YGEdge edge);
-
-YG_NODE_PROPERTY(void *, Context, context);
-YG_NODE_PROPERTY(YGMeasureFunc, MeasureFunc, measureFunc);
-YG_NODE_PROPERTY(YGBaselineFunc, BaselineFunc, baselineFunc)
-YG_NODE_PROPERTY(YGPrintFunc, PrintFunc, printFunc);
-YG_NODE_PROPERTY(bool, HasNewLayout, hasNewLayout);
-YG_NODE_PROPERTY(YGNodeType, NodeType, nodeType);
-
-YG_NODE_STYLE_PROPERTY(YGDirection, Direction, direction);
-YG_NODE_STYLE_PROPERTY(YGFlexDirection, FlexDirection, flexDirection);
-YG_NODE_STYLE_PROPERTY(YGJustify, JustifyContent, justifyContent);
-YG_NODE_STYLE_PROPERTY(YGAlign, AlignContent, alignContent);
-YG_NODE_STYLE_PROPERTY(YGAlign, AlignItems, alignItems);
-YG_NODE_STYLE_PROPERTY(YGAlign, AlignSelf, alignSelf);
-YG_NODE_STYLE_PROPERTY(YGPositionType, PositionType, positionType);
-YG_NODE_STYLE_PROPERTY(YGWrap, FlexWrap, flexWrap);
-YG_NODE_STYLE_PROPERTY(YGOverflow, Overflow, overflow);
-YG_NODE_STYLE_PROPERTY(YGDisplay, Display, display);
-
-YG_NODE_STYLE_PROPERTY(float, Flex, flex);
-YG_NODE_STYLE_PROPERTY(float, FlexGrow, flexGrow);
-YG_NODE_STYLE_PROPERTY(float, FlexShrink, flexShrink);
-YG_NODE_STYLE_PROPERTY_UNIT_AUTO(YGValue, FlexBasis, flexBasis);
-
-YG_NODE_STYLE_EDGE_PROPERTY_UNIT(YGValue, Position, position);
-YG_NODE_STYLE_EDGE_PROPERTY_UNIT(YGValue, Margin, margin);
-YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO(YGValue, Margin);
-YG_NODE_STYLE_EDGE_PROPERTY_UNIT(YGValue, Padding, padding);
-YG_NODE_STYLE_EDGE_PROPERTY(float, Border, border);
-
-YG_NODE_STYLE_PROPERTY_UNIT_AUTO(YGValue, Width, width);
-YG_NODE_STYLE_PROPERTY_UNIT_AUTO(YGValue, Height, height);
-YG_NODE_STYLE_PROPERTY_UNIT(YGValue, MinWidth, minWidth);
-YG_NODE_STYLE_PROPERTY_UNIT(YGValue, MinHeight, minHeight);
-YG_NODE_STYLE_PROPERTY_UNIT(YGValue, MaxWidth, maxWidth);
-YG_NODE_STYLE_PROPERTY_UNIT(YGValue, MaxHeight, maxHeight);
-
-// Yoga specific properties, not compatible with flexbox specification
-// Aspect ratio control the size of the undefined dimension of a node.
-// Aspect ratio is encoded as a floating point value width/height. e.g. A value of 2 leads to a node
-// with a width twice the size of its height while a value of 0.5 gives the opposite effect.
-//
-// - On a node with a set width/height aspect ratio control the size of the unset dimension
-// - On a node with a set flex basis aspect ratio controls the size of the node in the cross axis if
-// unset
-// - On a node with a measure function aspect ratio works as though the measure function measures
-// the flex basis
-// - On a node with flex grow/shrink aspect ratio controls the size of the node in the cross axis if
-// unset
-// - Aspect ratio takes min/max dimensions into account
-YG_NODE_STYLE_PROPERTY(float, AspectRatio, aspectRatio);
-
-YG_NODE_LAYOUT_PROPERTY(float, Left);
-YG_NODE_LAYOUT_PROPERTY(float, Top);
-YG_NODE_LAYOUT_PROPERTY(float, Right);
-YG_NODE_LAYOUT_PROPERTY(float, Bottom);
-YG_NODE_LAYOUT_PROPERTY(float, Width);
-YG_NODE_LAYOUT_PROPERTY(float, Height);
-YG_NODE_LAYOUT_PROPERTY(YGDirection, Direction);
-YG_NODE_LAYOUT_PROPERTY(bool, HadOverflow);
-
-// Get the computed values for these nodes after performing layout. If they were set using
-// point values then the returned value will be the same as YGNodeStyleGetXXX. However if
-// they were set using a percentage value then the returned value is the computed value used
-// during layout.
-YG_NODE_LAYOUT_EDGE_PROPERTY(float, Margin);
-YG_NODE_LAYOUT_EDGE_PROPERTY(float, Border);
-YG_NODE_LAYOUT_EDGE_PROPERTY(float, Padding);
-
-WIN_EXPORT void YGConfigSetLogger(const YGConfigRef config, YGLogger logger);
-WIN_EXPORT void YGLog(const YGNodeRef node, YGLogLevel level, const char *message, ...);
-WIN_EXPORT void YGLogWithConfig(const YGConfigRef config, YGLogLevel level, const char *format, ...);
-WIN_EXPORT void YGAssert(const bool condition, const char *message);
-WIN_EXPORT void YGAssertWithNode(const YGNodeRef node, const bool condition, const char *message);
-WIN_EXPORT void YGAssertWithConfig(const YGConfigRef config,
- const bool condition,
- const char *message);
-
-// Set this to number of pixels in 1 point to round calculation results
-// If you want to avoid rounding - set PointScaleFactor to 0
-WIN_EXPORT void YGConfigSetPointScaleFactor(const YGConfigRef config, const float pixelsInPoint);
-
-// Yoga previously had an error where containers would take the maximum space possible instead of
-// the minimum
-// like they are supposed to. In practice this resulted in implicit behaviour similar to align-self:
-// stretch;
-// Because this was such a long-standing bug we must allow legacy users to switch back to this
-// behaviour.
-WIN_EXPORT void YGConfigSetUseLegacyStretchBehaviour(const YGConfigRef config,
- const bool useLegacyStretchBehaviour);
-
-// YGConfig
-WIN_EXPORT YGConfigRef YGConfigNew(void);
-WIN_EXPORT void YGConfigFree(const YGConfigRef config);
-WIN_EXPORT void YGConfigCopy(const YGConfigRef dest, const YGConfigRef src);
-WIN_EXPORT int32_t YGConfigGetInstanceCount(void);
-
-WIN_EXPORT void YGConfigSetExperimentalFeatureEnabled(const YGConfigRef config,
- const YGExperimentalFeature feature,
- const bool enabled);
-WIN_EXPORT bool YGConfigIsExperimentalFeatureEnabled(const YGConfigRef config,
- const YGExperimentalFeature feature);
-
-// Using the web defaults is the prefered configuration for new projects.
-// Usage of non web defaults should be considered as legacy.
-WIN_EXPORT void YGConfigSetUseWebDefaults(const YGConfigRef config, const bool enabled);
-WIN_EXPORT bool YGConfigGetUseWebDefaults(const YGConfigRef config);
-
-WIN_EXPORT void YGConfigSetNodeClonedFunc(const YGConfigRef config,
- const YGNodeClonedFunc callback);
-
-// Export only for C#
-WIN_EXPORT YGConfigRef YGConfigGetDefault(void);
-
-WIN_EXPORT void YGConfigSetContext(const YGConfigRef config, void *context);
-WIN_EXPORT void *YGConfigGetContext(const YGConfigRef config);
-
-WIN_EXPORT float YGRoundValueToPixelGrid(
- const float value,
- const float pointScaleFactor,
- const bool forceCeil,
- const bool forceFloor);
-
-YG_EXTERN_C_END
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ *
+ */
+#pragma once
+
+#include <assert.h>
+#include <math.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef __cplusplus
+#include <stdbool.h>
+#endif
+
+/** Large positive number signifies that the property(float) is undefined.
+ *Earlier we used to have YGundefined as NAN, but the downside of this is that
+ *we can't use -ffast-math compiler flag as it assumes all floating-point
+ *calculation involve and result into finite numbers. For more information
+ *regarding -ffast-math compiler flag in clang, have a look at
+ *https://clang.llvm.org/docs/UsersManual.html#cmdoption-ffast-math
+ **/
+#define YGUndefined 10E20F
+
+#include "YGEnums.h"
+#include "YGMacros.h"
+
+YG_EXTERN_C_BEGIN
+
+typedef struct YGSize {
+ float width;
+ float height;
+} YGSize;
+
+typedef struct YGValue {
+ float value;
+ YGUnit unit;
+} YGValue;
+
+extern const YGValue YGValueUndefined;
+extern const YGValue YGValueAuto;
+
+#ifdef __cplusplus
+
+extern bool operator==(const YGValue& lhs, const YGValue& rhs);
+extern bool operator!=(const YGValue& lhs, const YGValue& rhs);
+
+#endif
+
+typedef struct YGConfig* YGConfigRef;
+
+typedef struct YGNode* YGNodeRef;
+
+typedef YGSize (*YGMeasureFunc)(
+ YGNodeRef node,
+ float width,
+ YGMeasureMode widthMode,
+ float height,
+ YGMeasureMode heightMode);
+typedef float (
+ *YGBaselineFunc)(YGNodeRef node, const float width, const float height);
+typedef void (*YGDirtiedFunc)(YGNodeRef node);
+typedef void (*YGPrintFunc)(YGNodeRef node);
+typedef int (*YGLogger)(
+ const YGConfigRef config,
+ const YGNodeRef node,
+ YGLogLevel level,
+ const char* format,
+ va_list args);
+typedef YGNodeRef (
+ *YGCloneNodeFunc)(YGNodeRef oldNode, YGNodeRef owner, int childIndex);
+
+// YGNode
+WIN_EXPORT YGNodeRef YGNodeNew(void);
+WIN_EXPORT YGNodeRef YGNodeNewWithConfig(const YGConfigRef config);
+WIN_EXPORT YGNodeRef YGNodeClone(const YGNodeRef node);
+WIN_EXPORT void YGNodeFree(const YGNodeRef node);
+WIN_EXPORT void YGNodeFreeRecursive(const YGNodeRef node);
+WIN_EXPORT void YGNodeReset(const YGNodeRef node);
+WIN_EXPORT int32_t YGNodeGetInstanceCount(void);
+
+WIN_EXPORT void YGNodeInsertChild(
+ const YGNodeRef node,
+ const YGNodeRef child,
+ const uint32_t index);
+
+// This function inserts the child YGNodeRef as a children of the node received
+// by parameter and set the Owner of the child object to null. This function is
+// expected to be called when using Yoga in persistent mode in order to share a
+// YGNodeRef object as a child of two different Yoga trees. The child YGNodeRef
+// is expected to be referenced from its original owner and from a clone of its
+// original owner.
+WIN_EXPORT void YGNodeInsertSharedChild(
+ const YGNodeRef node,
+ const YGNodeRef child,
+ const uint32_t index);
+WIN_EXPORT void YGNodeRemoveChild(const YGNodeRef node, const YGNodeRef child);
+WIN_EXPORT void YGNodeRemoveAllChildren(const YGNodeRef node);
+WIN_EXPORT YGNodeRef YGNodeGetChild(const YGNodeRef node, const uint32_t index);
+WIN_EXPORT YGNodeRef YGNodeGetOwner(const YGNodeRef node);
+WIN_EXPORT YGNodeRef YGNodeGetParent(const YGNodeRef node);
+WIN_EXPORT uint32_t YGNodeGetChildCount(const YGNodeRef node);
+WIN_EXPORT void YGNodeSetChildren(
+ YGNodeRef const owner,
+ const YGNodeRef children[],
+ const uint32_t count);
+
+WIN_EXPORT void YGNodeCalculateLayout(
+ const YGNodeRef node,
+ const float availableWidth,
+ const float availableHeight,
+ const YGDirection ownerDirection);
+
+// Mark a node as dirty. Only valid for nodes with a custom measure function
+// set.
+// YG knows when to mark all other nodes as dirty but because nodes with
+// measure functions
+// depends on information not known to YG they must perform this dirty
+// marking manually.
+WIN_EXPORT void YGNodeMarkDirty(const YGNodeRef node);
+
+// This function marks the current node and all its descendants as dirty. This
+// function is added to test yoga benchmarks. This function is not expected to
+// be used in production as calling `YGCalculateLayout` will cause the
+// recalculation of each and every node.
+WIN_EXPORT void YGNodeMarkDirtyAndPropogateToDescendants(const YGNodeRef node);
+
+WIN_EXPORT void YGNodePrint(const YGNodeRef node, const YGPrintOptions options);
+
+WIN_EXPORT bool YGFloatIsUndefined(const float value);
+
+WIN_EXPORT bool YGNodeCanUseCachedMeasurement(
+ const YGMeasureMode widthMode,
+ const float width,
+ const YGMeasureMode heightMode,
+ const float height,
+ const YGMeasureMode lastWidthMode,
+ const float lastWidth,
+ const YGMeasureMode lastHeightMode,
+ const float lastHeight,
+ const float lastComputedWidth,
+ const float lastComputedHeight,
+ const float marginRow,
+ const float marginColumn,
+ const YGConfigRef config);
+
+WIN_EXPORT void YGNodeCopyStyle(
+ const YGNodeRef dstNode,
+ const YGNodeRef srcNode);
+
+WIN_EXPORT void* YGNodeGetContext(YGNodeRef node);
+WIN_EXPORT void YGNodeSetContext(YGNodeRef node, void* context);
+void YGConfigSetPrintTreeFlag(YGConfigRef config, bool enabled);
+YGMeasureFunc YGNodeGetMeasureFunc(YGNodeRef node);
+WIN_EXPORT void YGNodeSetMeasureFunc(YGNodeRef node, YGMeasureFunc measureFunc);
+YGBaselineFunc YGNodeGetBaselineFunc(YGNodeRef node);
+void YGNodeSetBaselineFunc(YGNodeRef node, YGBaselineFunc baselineFunc);
+YGDirtiedFunc YGNodeGetDirtiedFunc(YGNodeRef node);
+void YGNodeSetDirtiedFunc(YGNodeRef node, YGDirtiedFunc dirtiedFunc);
+YGPrintFunc YGNodeGetPrintFunc(YGNodeRef node);
+void YGNodeSetPrintFunc(YGNodeRef node, YGPrintFunc printFunc);
+bool YGNodeGetHasNewLayout(YGNodeRef node);
+void YGNodeSetHasNewLayout(YGNodeRef node, bool hasNewLayout);
+YGNodeType YGNodeGetNodeType(YGNodeRef node);
+void YGNodeSetNodeType(YGNodeRef node, YGNodeType nodeType);
+bool YGNodeIsDirty(YGNodeRef node);
+bool YGNodeLayoutGetDidUseLegacyFlag(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetDirection(
+ const YGNodeRef node,
+ const YGDirection direction);
+WIN_EXPORT YGDirection YGNodeStyleGetDirection(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetFlexDirection(
+ const YGNodeRef node,
+ const YGFlexDirection flexDirection);
+WIN_EXPORT YGFlexDirection YGNodeStyleGetFlexDirection(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetJustifyContent(
+ const YGNodeRef node,
+ const YGJustify justifyContent);
+WIN_EXPORT YGJustify YGNodeStyleGetJustifyContent(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetAlignContent(
+ const YGNodeRef node,
+ const YGAlign alignContent);
+WIN_EXPORT YGAlign YGNodeStyleGetAlignContent(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetAlignItems(
+ const YGNodeRef node,
+ const YGAlign alignItems);
+WIN_EXPORT YGAlign YGNodeStyleGetAlignItems(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetAlignSelf(
+ const YGNodeRef node,
+ const YGAlign alignSelf);
+WIN_EXPORT YGAlign YGNodeStyleGetAlignSelf(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetPositionType(
+ const YGNodeRef node,
+ const YGPositionType positionType);
+WIN_EXPORT YGPositionType YGNodeStyleGetPositionType(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetFlexWrap(
+ const YGNodeRef node,
+ const YGWrap flexWrap);
+WIN_EXPORT YGWrap YGNodeStyleGetFlexWrap(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetOverflow(
+ const YGNodeRef node,
+ const YGOverflow overflow);
+WIN_EXPORT YGOverflow YGNodeStyleGetOverflow(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetDisplay(
+ const YGNodeRef node,
+ const YGDisplay display);
+WIN_EXPORT YGDisplay YGNodeStyleGetDisplay(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetFlex(const YGNodeRef node, const float flex);
+WIN_EXPORT float YGNodeStyleGetFlex(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetFlexGrow(
+ const YGNodeRef node,
+ const float flexGrow);
+WIN_EXPORT float YGNodeStyleGetFlexGrow(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetFlexShrink(
+ const YGNodeRef node,
+ const float flexShrink);
+WIN_EXPORT float YGNodeStyleGetFlexShrink(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetFlexBasis(
+ const YGNodeRef node,
+ const float flexBasis);
+WIN_EXPORT void YGNodeStyleSetFlexBasisPercent(
+ const YGNodeRef node,
+ const float flexBasis);
+WIN_EXPORT void YGNodeStyleSetFlexBasisAuto(const YGNodeRef node);
+WIN_EXPORT YGValue YGNodeStyleGetFlexBasis(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetPosition(
+ const YGNodeRef node,
+ const YGEdge edge,
+ const float position);
+WIN_EXPORT void YGNodeStyleSetPositionPercent(
+ const YGNodeRef node,
+ const YGEdge edge,
+ const float position);
+WIN_EXPORT WIN_STRUCT(YGValue)
+ YGNodeStyleGetPosition(const YGNodeRef node, const YGEdge edge);
+
+WIN_EXPORT void YGNodeStyleSetMargin(
+ const YGNodeRef node,
+ const YGEdge edge,
+ const float margin);
+WIN_EXPORT void YGNodeStyleSetMarginPercent(
+ const YGNodeRef node,
+ const YGEdge edge,
+ const float margin);
+WIN_EXPORT void YGNodeStyleSetMarginAuto(
+ const YGNodeRef node,
+ const YGEdge edge);
+WIN_EXPORT YGValue
+YGNodeStyleGetMargin(const YGNodeRef node, const YGEdge edge);
+
+WIN_EXPORT void YGNodeStyleSetPadding(
+ const YGNodeRef node,
+ const YGEdge edge,
+ const float padding);
+WIN_EXPORT void YGNodeStyleSetPaddingPercent(
+ const YGNodeRef node,
+ const YGEdge edge,
+ const float padding);
+WIN_EXPORT YGValue
+YGNodeStyleGetPadding(const YGNodeRef node, const YGEdge edge);
+
+WIN_EXPORT void YGNodeStyleSetBorder(
+ const YGNodeRef node,
+ const YGEdge edge,
+ const float border);
+WIN_EXPORT float YGNodeStyleGetBorder(const YGNodeRef node, const YGEdge edge);
+
+WIN_EXPORT void YGNodeStyleSetWidth(const YGNodeRef node, const float width);
+WIN_EXPORT void YGNodeStyleSetWidthPercent(
+ const YGNodeRef node,
+ const float width);
+WIN_EXPORT void YGNodeStyleSetWidthAuto(const YGNodeRef node);
+WIN_EXPORT YGValue YGNodeStyleGetWidth(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetHeight(const YGNodeRef node, const float height);
+WIN_EXPORT void YGNodeStyleSetHeightPercent(
+ const YGNodeRef node,
+ const float height);
+WIN_EXPORT void YGNodeStyleSetHeightAuto(const YGNodeRef node);
+WIN_EXPORT YGValue YGNodeStyleGetHeight(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetMinWidth(
+ const YGNodeRef node,
+ const float minWidth);
+WIN_EXPORT void YGNodeStyleSetMinWidthPercent(
+ const YGNodeRef node,
+ const float minWidth);
+WIN_EXPORT YGValue YGNodeStyleGetMinWidth(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetMinHeight(
+ const YGNodeRef node,
+ const float minHeight);
+WIN_EXPORT void YGNodeStyleSetMinHeightPercent(
+ const YGNodeRef node,
+ const float minHeight);
+WIN_EXPORT YGValue YGNodeStyleGetMinHeight(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetMaxWidth(
+ const YGNodeRef node,
+ const float maxWidth);
+WIN_EXPORT void YGNodeStyleSetMaxWidthPercent(
+ const YGNodeRef node,
+ const float maxWidth);
+WIN_EXPORT YGValue YGNodeStyleGetMaxWidth(const YGNodeRef node);
+
+WIN_EXPORT void YGNodeStyleSetMaxHeight(
+ const YGNodeRef node,
+ const float maxHeight);
+WIN_EXPORT void YGNodeStyleSetMaxHeightPercent(
+ const YGNodeRef node,
+ const float maxHeight);
+WIN_EXPORT YGValue YGNodeStyleGetMaxHeight(const YGNodeRef node);
+
+// Yoga specific properties, not compatible with flexbox specification
+// Aspect ratio control the size of the undefined dimension of a node.
+// Aspect ratio is encoded as a floating point value width/height. e.g. A value
+// of 2 leads to a node with a width twice the size of its height while a value
+// of 0.5 gives the opposite effect.
+//
+// - On a node with a set width/height aspect ratio control the size of the
+// unset dimension
+// - On a node with a set flex basis aspect ratio controls the size of the node
+// in the cross axis if unset
+// - On a node with a measure function aspect ratio works as though the measure
+// function measures the flex basis
+// - On a node with flex grow/shrink aspect ratio controls the size of the node
+// in the cross axis if unset
+// - Aspect ratio takes min/max dimensions into account
+WIN_EXPORT void YGNodeStyleSetAspectRatio(
+ const YGNodeRef node,
+ const float aspectRatio);
+WIN_EXPORT float YGNodeStyleGetAspectRatio(const YGNodeRef node);
+
+WIN_EXPORT float YGNodeLayoutGetLeft(const YGNodeRef node);
+WIN_EXPORT float YGNodeLayoutGetTop(const YGNodeRef node);
+WIN_EXPORT float YGNodeLayoutGetRight(const YGNodeRef node);
+WIN_EXPORT float YGNodeLayoutGetBottom(const YGNodeRef node);
+WIN_EXPORT float YGNodeLayoutGetWidth(const YGNodeRef node);
+WIN_EXPORT float YGNodeLayoutGetHeight(const YGNodeRef node);
+WIN_EXPORT YGDirection YGNodeLayoutGetDirection(const YGNodeRef node);
+WIN_EXPORT bool YGNodeLayoutGetHadOverflow(const YGNodeRef node);
+bool YGNodeLayoutGetDidLegacyStretchFlagAffectLayout(const YGNodeRef node);
+
+// Get the computed values for these nodes after performing layout. If they were
+// set using point values then the returned value will be the same as
+// YGNodeStyleGetXXX. However if they were set using a percentage value then the
+// returned value is the computed value used during layout.
+WIN_EXPORT float YGNodeLayoutGetMargin(const YGNodeRef node, const YGEdge edge);
+WIN_EXPORT float YGNodeLayoutGetBorder(const YGNodeRef node, const YGEdge edge);
+WIN_EXPORT float YGNodeLayoutGetPadding(
+ const YGNodeRef node,
+ const YGEdge edge);
+
+WIN_EXPORT void YGConfigSetLogger(const YGConfigRef config, YGLogger logger);
+WIN_EXPORT void
+YGLog(const YGNodeRef node, YGLogLevel level, const char* message, ...);
+WIN_EXPORT void YGLogWithConfig(
+ const YGConfigRef config,
+ YGLogLevel level,
+ const char* format,
+ ...);
+WIN_EXPORT void YGAssert(const bool condition, const char* message);
+WIN_EXPORT void YGAssertWithNode(
+ const YGNodeRef node,
+ const bool condition,
+ const char* message);
+WIN_EXPORT void YGAssertWithConfig(
+ const YGConfigRef config,
+ const bool condition,
+ const char* message);
+// Set this to number of pixels in 1 point to round calculation results
+// If you want to avoid rounding - set PointScaleFactor to 0
+WIN_EXPORT void YGConfigSetPointScaleFactor(
+ const YGConfigRef config,
+ const float pixelsInPoint);
+void YGConfigSetShouldDiffLayoutWithoutLegacyStretchBehaviour(
+ const YGConfigRef config,
+ const bool shouldDiffLayout);
+
+// Yoga previously had an error where containers would take the maximum space
+// possible instead of the minimum like they are supposed to. In practice this
+// resulted in implicit behaviour similar to align-self: stretch; Because this
+// was such a long-standing bug we must allow legacy users to switch back to
+// this behaviour.
+WIN_EXPORT void YGConfigSetUseLegacyStretchBehaviour(
+ const YGConfigRef config,
+ const bool useLegacyStretchBehaviour);
+
+// YGConfig
+WIN_EXPORT YGConfigRef YGConfigNew(void);
+WIN_EXPORT void YGConfigFree(const YGConfigRef config);
+WIN_EXPORT void YGConfigCopy(const YGConfigRef dest, const YGConfigRef src);
+WIN_EXPORT int32_t YGConfigGetInstanceCount(void);
+
+WIN_EXPORT void YGConfigSetExperimentalFeatureEnabled(
+ const YGConfigRef config,
+ const YGExperimentalFeature feature,
+ const bool enabled);
+WIN_EXPORT bool YGConfigIsExperimentalFeatureEnabled(
+ const YGConfigRef config,
+ const YGExperimentalFeature feature);
+
+// Using the web defaults is the prefered configuration for new projects.
+// Usage of non web defaults should be considered as legacy.
+WIN_EXPORT void YGConfigSetUseWebDefaults(
+ const YGConfigRef config,
+ const bool enabled);
+WIN_EXPORT bool YGConfigGetUseWebDefaults(const YGConfigRef config);
+
+WIN_EXPORT void YGConfigSetCloneNodeFunc(
+ const YGConfigRef config,
+ const YGCloneNodeFunc callback);
+
+// Export only for C#
+WIN_EXPORT YGConfigRef YGConfigGetDefault(void);
+
+WIN_EXPORT void YGConfigSetContext(const YGConfigRef config, void* context);
+WIN_EXPORT void* YGConfigGetContext(const YGConfigRef config);
+
+WIN_EXPORT float YGRoundValueToPixelGrid(
+ const float value,
+ const float pointScaleFactor,
+ const bool forceCeil,
+ const bool forceFloor);
+
+YG_EXTERN_C_END
+
+#ifdef __cplusplus
+
+#include <functional>
+#include <vector>
+
+// Calls f on each node in the tree including the given node argument.
+extern void YGTraversePreOrder(
+ YGNodeRef const node,
+ std::function<void(YGNodeRef node)>&& f);
+
+extern void YGNodeSetChildren(
+ YGNodeRef const owner,
+ const std::vector<YGNodeRef>& children);
+
+#endif