X-Git-Url: https://git.stderr.nl/gitweb?p=matthijs%2Fprojects%2Ffpprac.git;a=blobdiff_plain;f=FPPrac.hs;h=7e5a6914225519e0d3056b50344467794f405091;hp=fcbf33e15c00def5e1ada934f01a03d24b340cdc;hb=34b8f3ca223d5404d5f298e5fe9eb41c4002f0cb;hpb=8b21eea5d5be2a1ac267693382e77b772a10d73a

diff --git a/FPPrac.hs b/FPPrac.hs
index fcbf33e..7e5a691 100644
--- a/FPPrac.hs
+++ b/FPPrac.hs
@@ -162,8 +162,9 @@ runGUI w h (IS { .. }) = do
 	buffer' <- Cairo.createImageSurface Cairo.FormatARGB32 w h
 	buffer <- newIORef buffer'
 
-	-- Register the expose event
+	-- Register events
 	Gtk.on window Gtk.exposeEvent $ onExpose buffer
+	Gtk.on window Gtk.configureEvent $ onResize buffer
 
 	-- Repack state
 	let state = IS { .. }
@@ -187,6 +188,32 @@ onExpose buffer = do
 		Cairo.paint
 	return True -- No clue what this means
 
+-- | Called when the window is resized. Resize the given buffer if needed.
+onResize :: IORef Cairo.Surface -> EventM.EventM EventM.EConfigure Bool
+onResize buffer = do
+	-- Get the current buffer and see if it's still big enough
+	current_buffer <- liftIO $ readIORef buffer
+	sw <- Cairo.imageSurfaceGetWidth current_buffer
+	sh <- Cairo.imageSurfaceGetHeight current_buffer
+	-- Get the current drawwindow and its size
+	dw <- EventM.eventWindow
+	(w, h) <- liftIO $ Gtk.drawableGetSize dw
+	when (w > sw || h > sh) $ liftIO $ do
+		-- Buffer is too small, expand it.
+		new_buffer <- Cairo.createImageSurface Cairo.FormatARGB32 w h
+		-- Fill it with white and copy the old buffer
+		Cairo.renderWith new_buffer $ do
+			Cairo.setSourceRGB 1 1 1
+			Cairo.paint
+			Cairo.setSourceSurface current_buffer 0 0
+			Cairo.paint
+		-- Clean up the old buffer
+		Cairo.surfaceFinish current_buffer
+		-- Store and return the new buffer
+		writeIORef buffer new_buffer
+	return True -- No clue what this means
+				
+
 {-
 runGUI s IS {..} = do
 	sFrame <- frame
@@ -236,6 +263,8 @@ transKey _ _ = return ()
 
 -}
 
+-- | Handlers for various requests.
+miscHandler, winHandler, gfxHandler :: IState -> Request -> Maybe (IO ())
 {-
 miscHandler s@IS {..} (FRead  fn     ) = Just $ readFile fn >>= post s . FileContents fn
 miscHandler   IS {..} (FWrite fn cnts) = Just $ writeFile fn cnts
@@ -261,7 +290,7 @@ winHandler s@IS {..} (WinMenu      ms) = Just $ mkMenu >>= \ms' -> sFrame `set`
 -}
 winHandler _        _                = Nothing
 
-gfxHandler s req = case gfxHandler' s req of
+gfxHandler s req = case gfxHandler' req of
 	Nothing -> Nothing
 	Just render -> Just $ do
 		buf <- readIORef (buffer s)
@@ -278,12 +307,19 @@ gfxHandler IS {..} (GfxDisc      col rt)    = Just $ ellipse buffer rt [penColor
 gfxHandler IS {..} (GfxFont      st  sz)    = Just $ buffer `set` [ fontSize := sz, fontFace := st ]
 gfxHandler IS {..} (GfxPicture   fd  pt)    = Just $ bitmapCreateFromFile fd >>= \bm -> drawBitmap buffer bm pt False [] >> bitmapGetSize bm >>= dirtyRect' sPanel pt
 -}
-gfxHandler' IS {..} (GfxText      col (Point x y) st) = Just $ do
+-- | Helper function for gfxHanlder
+gfxHandler' :: Request -> Maybe (Cairo.Render ())
+gfxHandler' (GfxText col (Point x y) st) = Just $ do
+	-- Set the source color, move to the requested position and draw the
+	-- text
 	setSourceColor col
 	Cairo.moveTo (fromIntegral x) (fromIntegral y)
 	Cairo.showText st 
-gfxHandler' IS {..}  GfxClear                = Just $ Cairo.setSourceRGB 1 1 1 >> Cairo.paint
-gfxHandler' _        _                       = Nothing
+gfxHandler' GfxClear = Just $ do
+	-- Set the source to white and paint the entire surface with it
+	Cairo.setSourceRGB 1 1 1
+	Cairo.paint
+gfxHandler' _ = Nothing
 
 -- | Sets the source to a pattern fill of the given color
 setSourceColor :: Color -> Cairo.Render ()