data Point = Point !Int !Int deriving (Show, Eq)
-type Color = Gtk.Color
+-- A color, with RGB values from 0 to 1
+data Color = Color Double Double Double deriving (Show, Eq)
-- Create a Color from Red, Green and Blue values. The inputs should be
-- between 0 and 255 (inclusive).
rgb :: Int -> Int -> Int -> Color
-rgb r g b = Gtk.Color (conv r) (conv g) (conv b)
- where conv = fromInteger . toInteger . (*256)
+rgb r g b = Color (conv r) (conv g) (conv b)
+ where conv = (/256) . fromIntegral
-- | Some predefined colours
red = rgb 0xff 0 0
testProg = Main
{ initialState = 1
, initialRequests = [GfxText red (pt 0 0) "foo", GfxText blue (pt 100 100) "bar"]
- , eventHandler = \s e -> (s+1,[GfxText green (pt 50 50) $ show (s,e)])
+ , eventHandler = \s e -> (s+1,[GfxText green (pt 50 (50 + 10 * s)) $ show (s,e)])
, windowWidth = 200
, windowHeight = 200
}
data IState = forall s. IS
- { {-sFrame :: Frame ()
- , sPanel :: Panel ()
- , buffer :: MemoryDC ()
- , -}postponed :: IORef [Request]
+ { window :: Gtk.Window
+ , buffer :: IORef Cairo.Surface
+ , postponed :: IORef [Request]
, usrState :: IORef s
, usrProg :: TinaStep s
}
runTina Main {..} = do
usrState <- newIORef initialState
postponed <- newIORef (GfxText (rgb 0 0 0) (pt 50 50) "foo" : GfxClear :initialRequests)
- let state = IS { usrProg = eventHandler, .. }
- runGUI {-(sz windowWidth windowHeight) -}state
+ let state = IS { window = undefined, buffer = undefined, usrProg = eventHandler, .. }
+ runGUI windowWidth windowHeight state
-runGUI :: {-Size ->-} IState -> IO ()
-runGUI s = do
+runGUI :: Int -> Int -> IState -> IO ()
+runGUI w h (IS { .. }) = do
-- Init GTK.
Gtk.initGUI
-- Create a window, which will make the mainloop terminated when
-- it is closed.
window <- Gtk.windowNew
+
Gtk.set window [ Gtk.containerBorderWidth := 10
- , Gtk.windowTitle := "FP Practicum" ]
+ , Gtk.windowTitle := "FP Practicum"
+ , Gtk.windowDefaultWidth := w
+ , Gtk.windowDefaultHeight := h
+ ]
Gtk.onDestroy window Gtk.mainQuit
+ -- Create a buffer to draw on (name the actual buffer buffer', so we
+ -- can use IS { .. } syntax below to pack the state. Using a record update
+ -- wouldn't work, probably because Cairo.Surface contains an existential
+ -- type...
+ -- We put the buffer in an IORef, so we can change it for a new one
+ -- later on (on window resizes).
+ buffer' <- Cairo.createImageSurface Cairo.FormatARGB32 w h
+ buffer <- newIORef buffer'
+
+ -- Repack state
+ let state = IS { .. }
+
+ -- Register events
+ Gtk.on window Gtk.exposeEvent $ onExpose buffer
+ Gtk.on window Gtk.configureEvent $ onResize buffer
+ Gtk.on window Gtk.keyPressEvent $ onKeyDown state
+
+ -- Process any initial requests
+ processPostponed state
+
-- Show the window and start the Gtk mainloop.
Gtk.widgetShowAll window
Gtk.mainGUI
+-- | Called when a key is pressed.
+onKeyDown :: IState -> EventM.EventM EventM.EKey Bool
+onKeyDown s = do
+ keyval <- EventM.eventKeyVal
+ case Gtk.keyToChar keyval of
+ Just c -> liftIO $ post s (KeyIn c)
+ Nothing -> return ()
+ return True -- No clue what this means
+
+-- | Called when (part of) the window should be redrawn. Copy the given surface
+-- to the exposed window on an expose event.
+onExpose :: IORef Cairo.Surface -> EventM.EventM EventM.EExpose Bool
+onExpose buffer = do
+ current_buffer <- liftIO $ readIORef buffer
+ dw <- EventM.eventWindow
+ -- Copy the buffer to the window
+ liftIO $ Gtk.renderWithDrawable dw $ do
+ Cairo.setSourceSurface current_buffer 0 0
+ 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
-}
+-- | 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
-}
winHandler _ _ = Nothing
+gfxHandler s req = case gfxHandler' req of
+ Nothing -> Nothing
+ Just render -> Just $ do
+ buf <- readIORef (buffer s)
+ Cairo.renderWith buf render
+ Gtk.widgetQueueDraw (window s)
+
{-
gfxHandler IS {..} (GfxLines col ps) = Just $ polyline buffer ps [penColor := col] >> dirtyPts sPanel ps
gfxHandler IS {..} (GfxPolygon col ps) = Just $ polygon buffer ps [penColor := col, brushColor := col] >> dirtyPts sPanel ps
gfxHandler IS {..} (GfxEllipse col rt) = Just $ ellipse buffer rt [penColor := col, brushKind := BrushTransparent] >> dirtyRect sPanel rt
gfxHandler IS {..} (GfxDisc col rt) = Just $ ellipse buffer rt [penColor := col, brushColor := col] >> dirtyRect sPanel rt
gfxHandler IS {..} (GfxFont st sz) = Just $ buffer `set` [ fontSize := sz, fontFace := st ]
-gfxHandler IS {..} GfxClear = Just $ dcClear buffer >> windowRefresh sPanel False
gfxHandler IS {..} (GfxPicture fd pt) = Just $ bitmapCreateFromFile fd >>= \bm -> drawBitmap buffer bm pt False [] >> bitmapGetSize bm >>= dirtyRect' sPanel pt
-}
-gfxHandler _ _ = Nothing
+-- | 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' 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 ()
+setSourceColor (Color r g b) =
+ Cairo.setSourceRGB r g b
{-
dirtyPts :: Window a -> [Point] -> IO ()
projects / matthijs / projects / fpprac.git / blobdiff