happstack-yui-7372.5.1: bundle/event-flick/event-flick-coverage.js
/*
YUI 3.7.2 (build 5639)
Copyright 2012 Yahoo! Inc. All rights reserved.
Licensed under the BSD License.
http://yuilibrary.com/license/
*/
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YUI.add('event-flick', function (Y, NAME) {
/**
* The gestures module provides gesture events such as "flick", which normalize user interactions
* across touch and mouse or pointer based input devices. This layer can be used by application developers
* to build input device agnostic components which behave the same in response to either touch or mouse based
* interaction.
*
* <p>Documentation for events added by this module can be found in the event document for the <a href="YUI.html#events">YUI</a> global.</p>
*
* @module event-gestures
*/
/**
* Adds support for a "flick" event, which is fired at the end of a touch or mouse based flick gesture, and provides
* velocity of the flick, along with distance and time information.
*
* @module event-gestures
* @submodule event-flick
*/
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var GESTURE_MAP = Y.Event._GESTURE_MAP,
EVENT = {
start: GESTURE_MAP.start,
end: GESTURE_MAP.end,
move: GESTURE_MAP.move
},
START = "start",
END = "end",
MOVE = "move",
OWNER_DOCUMENT = "ownerDocument",
MIN_VELOCITY = "minVelocity",
MIN_DISTANCE = "minDistance",
PREVENT_DEFAULT = "preventDefault",
_FLICK_START = "_fs",
_FLICK_START_HANDLE = "_fsh",
_FLICK_END_HANDLE = "_feh",
_FLICK_MOVE_HANDLE = "_fmh",
NODE_TYPE = "nodeType";
/**
* Sets up a "flick" event, that is fired whenever the user initiates a flick gesture on the node
* where the listener is attached. The subscriber can specify a minimum distance or velocity for
* which the event is to be fired. The subscriber can also specify if there is a particular axis which
* they are interested in - "x" or "y". If no axis is specified, the axis along which there was most distance
* covered is used.
*
* <p>It is recommended that you use Y.bind to set up context and additional arguments for your event handler,
* however if you want to pass the context and arguments as additional signature arguments to "on",
* you need to provide a null value for the configuration object, e.g: <code>node.on("flick", fn, null, context, arg1, arg2, arg3)</code></p>
*
* @event flick
* @for YUI
* @param type {string} "flick"
* @param fn {function} The method the event invokes. It receives an event facade with an e.flick object containing the flick related properties: e.flick.time, e.flick.distance, e.flick.velocity and e.flick.axis, e.flick.start.
* @param cfg {Object} Optional. An object which specifies any of the following:
* <dl>
* <dt>minDistance (in pixels, defaults to 10)</dt>
* <dd>The minimum distance between start and end points, which would qualify the gesture as a flick.</dd>
* <dt>minVelocity (in pixels/ms, defaults to 0)</dt>
* <dd>The minimum velocity which would qualify the gesture as a flick.</dd>
* <dt>preventDefault (defaults to false)</dt>
* <dd>Can be set to true/false to prevent default behavior as soon as the touchstart/touchend or mousedown/mouseup is received so that things like scrolling or text selection can be
* prevented. This property can also be set to a function, which returns true or false, based on the event facade passed to it.</dd>
* <dt>axis (no default)</dt>
* <dd>Can be set to "x" or "y" if you want to constrain the flick velocity and distance to a single axis. If not
* defined, the axis along which the maximum distance was covered is used.</dd>
* </dl>
* @return {EventHandle} the detach handle
*/
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Y.Event.define('flick', {
on: function (node, subscriber, ce) {
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var startHandle = node.on(EVENT[START],
this._onStart,
this,
node,
subscriber,
ce);
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subscriber[_FLICK_START_HANDLE] = startHandle;
},
detach: function (node, subscriber, ce) {
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var startHandle = subscriber[_FLICK_START_HANDLE],
endHandle = subscriber[_FLICK_END_HANDLE];
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if (startHandle) {
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startHandle.detach();
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subscriber[_FLICK_START_HANDLE] = null;
}
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if (endHandle) {
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endHandle.detach();
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subscriber[_FLICK_END_HANDLE] = null;
}
},
processArgs: function(args) {
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var params = (args.length > 3) ? Y.merge(args.splice(3, 1)[0]) : {};
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if (!(MIN_VELOCITY in params)) {
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params[MIN_VELOCITY] = this.MIN_VELOCITY;
}
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if (!(MIN_DISTANCE in params)) {
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params[MIN_DISTANCE] = this.MIN_DISTANCE;
}
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if (!(PREVENT_DEFAULT in params)) {
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params[PREVENT_DEFAULT] = this.PREVENT_DEFAULT;
}
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return params;
},
_onStart: function(e, node, subscriber, ce) {
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var start = true, // always true for mouse
endHandle,
moveHandle,
doc,
preventDefault = subscriber._extra.preventDefault,
origE = e;
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if (e.touches) {
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start = (e.touches.length === 1);
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e = e.touches[0];
}
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if (start) {
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if (preventDefault) {
// preventDefault is a boolean or function
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if (!preventDefault.call || preventDefault(e)) {
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origE.preventDefault();
}
}
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e.flick = {
time : new Date().getTime()
};
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subscriber[_FLICK_START] = e;
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endHandle = subscriber[_FLICK_END_HANDLE];
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doc = (node.get(NODE_TYPE) === 9) ? node : node.get(OWNER_DOCUMENT);
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if (!endHandle) {
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endHandle = doc.on(EVENT[END], Y.bind(this._onEnd, this), null, node, subscriber, ce);
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subscriber[_FLICK_END_HANDLE] = endHandle;
}
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subscriber[_FLICK_MOVE_HANDLE] = doc.once(EVENT[MOVE], Y.bind(this._onMove, this), null, node, subscriber, ce);
}
},
_onMove: function(e, node, subscriber, ce) {
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var start = subscriber[_FLICK_START];
// Start timing from first move.
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if (start && start.flick) {
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start.flick.time = new Date().getTime();
}
},
_onEnd: function(e, node, subscriber, ce) {
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var endTime = new Date().getTime(),
start = subscriber[_FLICK_START],
valid = !!start,
endEvent = e,
startTime,
time,
preventDefault,
params,
xyDistance,
distance,
velocity,
axis,
moveHandle = subscriber[_FLICK_MOVE_HANDLE];
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if (moveHandle) {
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moveHandle.detach();
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delete subscriber[_FLICK_MOVE_HANDLE];
}
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if (valid) {
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if (e.changedTouches) {
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if (e.changedTouches.length === 1 && e.touches.length === 0) {
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endEvent = e.changedTouches[0];
} else {
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valid = false;
}
}
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if (valid) {
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params = subscriber._extra;
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preventDefault = params[PREVENT_DEFAULT];
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if (preventDefault) {
// preventDefault is a boolean or function
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if (!preventDefault.call || preventDefault(e)) {
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e.preventDefault();
}
}
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startTime = start.flick.time;
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endTime = new Date().getTime();
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time = endTime - startTime;
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xyDistance = [
endEvent.pageX - start.pageX,
endEvent.pageY - start.pageY
];
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if (params.axis) {
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axis = params.axis;
} else {
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axis = (Math.abs(xyDistance[0]) >= Math.abs(xyDistance[1])) ? 'x' : 'y';
}
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distance = xyDistance[(axis === 'x') ? 0 : 1];
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velocity = (time !== 0) ? distance/time : 0;
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if (isFinite(velocity) && (Math.abs(distance) >= params[MIN_DISTANCE]) && (Math.abs(velocity) >= params[MIN_VELOCITY])) {
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e.type = "flick";
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e.flick = {
time:time,
distance: distance,
velocity:velocity,
axis: axis,
start : start
};
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ce.fire(e);
}
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subscriber[_FLICK_START] = null;
}
}
},
MIN_VELOCITY : 0,
MIN_DISTANCE : 0,
PREVENT_DEFAULT : false
});
}, '3.7.2', {"requires": ["node-base", "event-touch", "event-synthetic"]});