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{-# LANGUAGE ExistentialQuantification, StandaloneDeriving, FlexibleContexts, MultiParamTypeClasses, FunctionalDependencies #-}
module Phi.Widget ( Display(..)
, withDisplay
, getAtoms
, getScreenWindows
, getScreens
, unionArea
, Widget(..)
, WidgetClass(..)
, WidgetState(..)
, separator
, createWidgetState
, layoutWidgets
, renderWidgets
, handleMessageWidgets
) where
import Control.Arrow
import Control.Arrow.Transformer
import Control.CacheArrow
import Control.Concurrent.MVar
import Control.Monad
import Control.Monad.IO.Class
import Data.Traversable hiding (forM)
import qualified Graphics.X11.Xlib as Xlib
import Graphics.Rendering.Cairo
import Phi.Phi
import Phi.X11.Atoms
data Display = Display !(MVar Xlib.Display) !Atoms ![(Xlib.Rectangle, Xlib.Window)]
withDisplay :: MonadIO m => Display -> (Xlib.Display -> m a) -> m a
withDisplay (Display dispvar _ _) f = do
disp <- liftIO $ takeMVar dispvar
a <- f disp
liftIO $ putMVar dispvar disp
return a
getAtoms :: Display -> Atoms
getAtoms (Display _ atoms _) = atoms
getScreenWindows :: Display -> [(Xlib.Rectangle, Xlib.Window)]
getScreenWindows (Display _ _ screenWindows) = screenWindows
getScreens :: Display -> [Xlib.Rectangle]
getScreens = map fst . getScreenWindows
unionArea :: Xlib.Rectangle -> Xlib.Rectangle -> Int
unionArea a b = fromIntegral $ uw*uh
where
uw = max 0 $ (min ax2 bx2) - (max ax1 bx1)
uh = max 0 $ (min ay2 by2) - (max ay1 by1)
Xlib.Rectangle ax1 ay1 aw ah = a
Xlib.Rectangle bx1 by1 bw bh = b
ax2 = ax1 + fromIntegral aw
ay2 = ay1 + fromIntegral ah
bx2 = bx1 + fromIntegral bw
by2 = by1 + fromIntegral bh
class (Show a, Eq a, Eq d) => WidgetClass a d | a -> d where
initWidget :: a -> Phi -> Display -> IO d
minSize :: a -> d -> Int -> Xlib.Rectangle -> Int
weight :: a -> Float
weight _ = 0
layout :: a -> d -> Int -> Int -> Xlib.Rectangle -> d
layout _ priv _ _ _ = priv
render :: a -> d -> Int -> Int -> Int -> Int -> Xlib.Rectangle -> Render ()
handleMessage :: a -> d -> Message -> d
handleMessage _ priv _ = priv
data Widget = forall a d. WidgetClass a d => Widget !a
deriving instance Show Widget
instance Eq Widget where
_ == _ = False
data WidgetState = forall a d. WidgetClass a d =>
WidgetState { stateWidget :: !a
, stateX :: !Int
, stateY :: !Int
, stateWidth :: !Int
, stateHeight :: !Int
, statePrivateData :: !d
, stateRender :: !(CacheArrow (Kleisli IO) (a, d, Int, Int, Int, Int, Xlib.Rectangle) Surface)
}
instance Eq WidgetState where
_ == _ = False
createStateRender :: WidgetClass a d => CacheArrow (Kleisli IO) (a, d, Int, Int, Int, Int, Xlib.Rectangle) Surface
createStateRender = lift . Kleisli $ \(widget, state, x, y, w, h, screen) -> do
surface <- createImageSurface FormatARGB32 w h
renderWith surface $ do
setOperator OperatorClear
paint
setOperator OperatorOver
render widget state x y w h screen
return surface
createWidgetState :: Phi -> Display -> Widget -> IO WidgetState
createWidgetState phi disp (Widget w) = do
priv <- initWidget w phi disp
return WidgetState { stateWidget = w
, stateX = 0
, stateY = 0
, stateWidth = 0
, stateHeight = 0
, statePrivateData = priv
, stateRender = createStateRender
}
layoutWidgets :: [WidgetState] -> Int -> Int -> Int -> Int -> Xlib.Rectangle -> [WidgetState]
layoutWidgets widgets x y width height screen = snd $ mapAccumL layoutWidgetAndX x widgets
where
sizesum = sum $ map (\(WidgetState {stateWidget = w, statePrivateData = priv} ) -> nneg $ minSize w priv height screen) widgets
wsum = let wsum = sum $ map (\(WidgetState {stateWidget = w} ) -> nneg . weight $ w) widgets
in if wsum > 0 then wsum else 1
surplus = width - sizesum
layoutWidgetAndX wX state = let lw = layoutWidget wX state
in (wX + stateWidth lw, lw)
layoutWidget wX state = case state of
WidgetState {stateWidget = w, statePrivateData = priv, stateRender = render} ->
let wWidth = floor $ (fromIntegral $ minSize w priv height screen) + (fromIntegral surplus)*(nneg $ weight w)/wsum
priv' = layout w priv wWidth height screen
in WidgetState w wX y wWidth height priv' render
nneg :: (Num a, Ord a) => a -> a
nneg x = max 0 x
renderWidgets :: [WidgetState] -> Xlib.Rectangle -> Int -> Int -> Render [WidgetState]
renderWidgets widgets screen winX winY = forM widgets $ \(WidgetState widget x y w h priv render) -> do
(surface, render') <- liftIO $ runKleisli (runCache render) (widget, priv, winX+x, winY+y, w, h, screen)
save
translate (fromIntegral x) (fromIntegral y)
withPatternForSurface surface setSource
paint
restore
return $ WidgetState widget x y w h priv render'
handleMessageWidgets :: Message -> [WidgetState] -> [WidgetState]
handleMessageWidgets message = map handleMessageWidget
where
handleMessageWidget (WidgetState w x y width height priv render) = WidgetState w x y width height (handleMessage w priv message) render
data Separator = Separator Int Float deriving (Show, Eq)
instance WidgetClass Separator () where
initWidget _ _ _ = return ()
minSize (Separator s _) _ _ _ = s
weight (Separator _ w) = w
render _ _ _ _ _ _ _ = return ()
separator :: Int -> Float -> Widget
separator s w = Widget $ Separator s w
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