manatee-pdfviewer-0.0.8: Manatee/Extension/PdfViewer/PdfView.hs
-- Author: Andy Stewart <lazycat.manatee@gmail.com>
-- Maintainer: Andy Stewart <lazycat.manatee@gmail.com>
--
-- Copyright (C) 2010 Andy Stewart, all rights reserved.
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE DeriveDataTypeable #-}
module Manatee.Extension.PdfViewer.PdfView where
import Control.Applicative
import Control.Arrow
import Control.Concurrent.STM
import Control.Monad.State
import Data.Map (Map)
import Data.Text.Lazy (Text)
import Data.Typeable
import Graphics.Rendering.Cairo
import Graphics.UI.Gtk hiding (Statusbar, statusbarNew, get)
import Graphics.UI.Gtk.Gdk.SerializedEvent
import Graphics.UI.Gtk.Poppler.Document
import Graphics.UI.Gtk.Poppler.Page
import Manatee.Core.PageFrame
import Manatee.Core.PageView
import Manatee.Core.Types
import Manatee.Extension.PdfViewer.PdfBuffer
import Manatee.Toolkit.General.Basic
import Manatee.Toolkit.General.STM
import Manatee.Toolkit.Gtk.Event
import Manatee.Toolkit.Gtk.Gtk
import Paths_manatee_pdfviewer
import System.FilePath
import qualified Data.Map as M
data PdfView =
PdfView {pdfViewPlugId :: TVar PagePlugId
,pdfViewFrame :: PageFrame
,pdfViewView :: DrawingArea
,pdfViewBuffer :: PdfBuffer
,pdfViewPageIndex :: TVar Int
,pdfViewScale :: TVar Double
}
deriving Typeable
instance PageBuffer PdfBuffer where
pageBufferGetName = readTVarIO . pdfBufferPath
pageBufferSetName a = writeTVarIO (pdfBufferPath a)
pageBufferClient = pdfBufferClient
pageBufferCreateView a pId = PageViewWrap <$> pdfViewNew a pId
pageBufferMode = pdfBufferMode
pageBufferPackageName _ = fmap takeFileName getDataDir
instance PageView PdfView where
pageViewBuffer = PageBufferWrap . pdfViewBuffer
pageViewPlugId = pdfViewPlugId
pageViewBox = pageFrameBox . pdfViewFrame
pageViewScrolledWindow = pdfViewScrolledWindow
pageViewFocus = widgetGrabFocus . pdfViewView
pageViewHandleKeyAction = pdfViewHandleKeyAction
-- | New pdf viewer view.
pdfViewNew :: PdfBuffer -> PagePlugId -> IO PdfView
pdfViewNew buffer plugId = do
-- Create plug id.
pId <- newTVarIO plugId
-- Create UI frame.
pFrame <- pageFrameNewWithModeName (pageModeName $ pdfBufferMode buffer)
-- Create view.
view <- drawingAreaNew
scrolledWindowAddWithViewport (pageFrameScrolledWindow pFrame) view
pageIndex <- newTVarIO 0
scale <- newTVarIO 0
let viewer = PdfView pId pFrame view buffer pageIndex scale
-- Redraw signal.
view `on` exposeEvent $ tryEvent $ pdfViewHandleExpose viewer
return viewer
-- | Handle expose signal.
pdfViewHandleExpose :: PdfView -> EventM EExpose ()
pdfViewHandleExpose view@(PdfView {pdfViewBuffer = buffer
,pdfViewScale = viewScale
}) = do
(winWidth, _) <- eventWindowSize
liftIO $ do
let (pageWidth, pageHeight) = pdfBufferPageSize buffer
area = pdfViewView view
-- Init scale and size request.
readTVarIO viewScale
>>= \ value ->
-- Update scale value and area size request when haven't set.
when (value == 0) $ do
-- Update scale value.
let scaleValue = (winWidth / pageWidth)
writeTVarIO viewScale scaleValue
-- Update size request.
widgetSetSizeRequest
area
(truncate winWidth)
(truncate (scaleValue * pageHeight * i2d (pdfBufferNPages buffer)))
-- Draw.
pdfViewDraw view
-- | Draw for viewer.
pdfViewDraw :: PdfView -> IO ()
pdfViewDraw view@(PdfView {pdfViewBuffer = buffer
,pdfViewScale = viewScale
,pdfViewPageIndex = pageIndex
}) = do
-- Init.
let (_, pageHeight) = pdfBufferPageSize buffer
doc = pdfBufferDocument buffer
area = pdfViewView view
-- Get render index range and scale value.
(indexRange, currentIndex) <- pdfViewGetIndexRange view
scaleValue <- readTVarIO viewScale
-- Update page information.
writeTVarIO pageIndex currentIndex
pageFrameUpdateStatusbar
(pdfViewFrame view)
"Page"
("Page (" ++ show (currentIndex + 1) ++ "/" ++ show (pdfBufferNPages buffer) ++ ")")
-- Render page.
forM_ indexRange $ \ index -> do
page <- documentGetPage doc index
drawWindow <- widgetGetDrawWindow area
renderWithDrawable drawWindow $ do
setSourceRGB 1.0 1.0 1.0
translate 0 (scaleValue * pageHeight * i2d index)
scale scaleValue scaleValue
pageRender page
-- | Handle key action.
pdfViewHandleKeyAction :: PdfView -> Text -> SerializedEvent -> IO ()
pdfViewHandleKeyAction view keystoke sEvent =
case M.lookup keystoke pdfViewKeymap of
Just action -> action view
Nothing -> widgetPropagateEvent (pdfViewView view) sEvent
-- | Update adjustment.
pdfViewUpdateAdjustment :: PdfView -> (Double, Double) -> IO ()
pdfViewUpdateAdjustment view (width, height) = do
let sWin = pdfViewScrolledWindow view
hAdj <- scrolledWindowGetHAdjustment sWin
vAdj <- scrolledWindowGetVAdjustment sWin
adjustmentSetUpper hAdj width
adjustmentSetUpper vAdj height
-- | Keymap.
pdfViewKeymap :: Map Text (PdfView -> IO ())
pdfViewKeymap =
M.fromList [("j", pageViewScrollVerticalStep True)
,("k", pageViewScrollVerticalStep False)
,("Down", pageViewScrollVerticalStep True)
,("Up", pageViewScrollVerticalStep False)
,(" ", pageViewScrollVerticalPage True)
,("b", pageViewScrollVerticalPage False)
,("J", pageViewScrollToBottom)
,("K", pageViewScrollToTop)
,("n", pdfViewNextPage)
,("p", pdfViewPrevPage)
,("N", pdfViewLastPage)
,("P", pdfViewFirstPage)
,("g", pdfViewGotoPage)
]
-- | Get index range to render visible are.
pdfViewGetIndexRange :: PdfView -> IO ([Int], Int)
pdfViewGetIndexRange view@(PdfView {pdfViewBuffer = buffer
,pdfViewScale = scale}) = do
vAdj <- scrolledWindowGetVAdjustment $ pdfViewScrolledWindow view
vAdjTop <- adjustmentGetValue vAdj
vAdjSize <- adjustmentGetPageSize vAdj
scaleValue <- readTVarIO scale
let vAdjBottom = vAdjTop + vAdjSize
(_, height) = ((*) scaleValue *** (*) scaleValue) $ pdfBufferPageSize buffer
nPages = pdfBufferNPages buffer
topIndex = truncate $ vAdjTop / height
bottonIndex = truncate $ vAdjBottom / height
startIndex = (\x -> if x < 0 then 0 else x) topIndex
endIndex = (\x -> if x >= nPages then nPages - 1 else x)
$ if vAdjBottom - i2d bottonIndex * height == 0.0
then bottonIndex - 1
else bottonIndex
-- Use point at half of visible area avoid bound value problem.
currIndex = truncate $ (vAdjTop + vAdjSize / 2) / height
return ([startIndex..endIndex], currIndex)
-- | Set page.
pdfViewSetPage :: PdfView -> Int -> IO ()
pdfViewSetPage view@(PdfView {pdfViewBuffer = buffer
,pdfViewScale = viewScale
}) page = do
scaleValue <- readTVarIO viewScale
let (_, height) = pdfBufferPageSize buffer
minIndex = 0
maxIndex = pdfBufferNPages buffer - 1
destIndex <-
if page < minIndex
then do
pageFrameShowOutputbar (pdfViewFrame view) "Out of bound, goto first page." Nothing
return minIndex
else if page > maxIndex
then do
pageFrameShowOutputbar (pdfViewFrame view) "Out of bound, goto last page." Nothing
return maxIndex
else return page
vAdj <- scrolledWindowGetVAdjustment $ pdfViewScrolledWindow view
adjustmentSetValue vAdj (i2d destIndex * height * scaleValue)
-- | View next page.
pdfViewNextPage :: PdfView -> IO ()
pdfViewNextPage view@(PdfView {pdfViewPageIndex = pageIndex}) = do
currentIndex <- readTVarIO pageIndex
pdfViewSetPage view (currentIndex + 1)
-- | View prev page.
pdfViewPrevPage :: PdfView -> IO ()
pdfViewPrevPage view@(PdfView {pdfViewPageIndex = pageIndex}) = do
currentIndex <- readTVarIO pageIndex
pdfViewSetPage view (currentIndex - 1)
-- | First page.
pdfViewFirstPage :: PdfView -> IO ()
pdfViewFirstPage view =
pdfViewSetPage view 0
-- | Last page.
pdfViewLastPage :: PdfView -> IO ()
pdfViewLastPage view@(PdfView {pdfViewBuffer = buffer}) = do
let maxIndex = pdfBufferNPages buffer - 1
pdfViewSetPage view maxIndex
-- | Goto page.
pdfViewGotoPage :: PdfView -> IO ()
pdfViewGotoPage view@(PdfView {pdfViewBuffer = buffer}) = do
let maxPage = pdfBufferNPages buffer
localInteractive view ("nGoto page (1 - " ++ show maxPage ++ ") : ") $ \ [page] -> do
let pageNumber = read page :: Int
pdfViewSetPage view (pageNumber - 1)
-- | Scrolled window.
pdfViewScrolledWindow :: PdfView -> ScrolledWindow
pdfViewScrolledWindow =
pageFrameScrolledWindow . pdfViewFrame