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{-# LANGUAGE ExistentialQuantification, StandaloneDeriving, MultiParamTypeClasses, FunctionalDependencies, TypeSynonymInstances, FlexibleInstances #-}
module Phi.Widget ( Display(..)
, withDisplay
, getAtoms
, getScreenWindows
, getScreens
, unionArea
, SurfaceSlice(..)
, Widget(..)
, CompoundWidget
, (<~>)
, IOCache
, RenderCache
, createIOCache
, runIOCache
, createRenderCache
, renderCached
, Separator
, separator
) where
import Control.Arrow
import Control.Arrow.Transformer
import Control.CacheArrow
import Control.Concurrent.MVar
import Control.Monad
import Control.Monad.State.Strict hiding (lift)
import Control.Monad.IO.Class
import Data.Maybe
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
data SurfaceSlice = SurfaceSlice !Int !Surface
class Eq s => Widget w s c | w -> s, w -> c where
initWidget :: w -> Phi -> Display -> IO s
initCache :: w -> c
minSize :: w -> s -> Int -> Xlib.Rectangle -> Int
weight :: w -> Float
weight _ = 0
layout :: w -> s -> Int -> Int -> Xlib.Rectangle -> s
layout _ priv _ _ _ = priv
render :: w -> s -> Int -> Int -> Int -> Int -> Xlib.Rectangle -> StateT c IO [(Bool, SurfaceSlice)]
handleMessage :: w -> s -> Message -> s
handleMessage _ priv _ = priv
type IOCache = CacheArrow (Kleisli IO)
type RenderCache w s = IOCache (w, s, Int, Int, Int, Int, Xlib.Rectangle) Surface
createIOCache :: Eq a => (a -> IO b) -> IOCache a b
createIOCache = lift . Kleisli
runIOCache :: Eq a => a -> StateT (IOCache a b) IO b
runIOCache a = do
cache <- get
(b, cache') <- liftIO $ runKleisli (runCache cache) a
put cache'
return b
createRenderCache :: (w -> s -> Int -> Int -> Int -> Int -> Xlib.Rectangle -> Render ())
-> CacheArrow (Kleisli IO) (w, s, Int, Int, Int, Int, Xlib.Rectangle) Surface
createRenderCache f = lift . Kleisli $ \(widget, state, x, y, w, h, screen) -> do
surface <- createImageSurface FormatARGB32 w h
renderWith surface $ do
setOperator OperatorClear
paint
setOperator OperatorOver
f widget state x y w h screen
return surface
renderCached :: (Eq w, Eq s) => w -> s -> Int -> Int -> Int -> Int -> Xlib.Rectangle -> StateT (RenderCache w s) IO [(Bool, SurfaceSlice)]
renderCached widget state x y w h screen = do
cache <- get
(surf, updated, cache') <- liftIO $ runKleisli (runCache' cache) (widget, state, x, y, w, h, screen)
put cache'
return [(updated, SurfaceSlice 0 surf)]
data CompoundWidget a sa ca b sb cb = (Widget a sa ca, Widget b sb cb) => CompoundWidget !a !b
data CompoundState a sa ca b sb cb = (Widget a sa ca, Widget b sb cb) => CompoundState !sa !sb !Int
deriving instance Eq (CompoundState a sa ca b sb cb)
data CompoundCache a sa ca b sb cb = (Widget a sa ca, Widget b sb cb) => CompoundCache !ca !cb
instance Widget (CompoundWidget a sa ca b sb cb) (CompoundState a sa ca b sb cb) (CompoundCache a sa ca b sb cb) where
initWidget (CompoundWidget a b) phi disp = liftM3 CompoundState (initWidget a phi disp) (initWidget b phi disp) (return 0)
initCache (CompoundWidget a b) = CompoundCache (initCache a) (initCache b)
minSize (CompoundWidget a b) (CompoundState da db _) height screen = minSize a da height screen + minSize b db height screen
weight (CompoundWidget a b) = weight' a + weight' b
layout c@(CompoundWidget a b) s@(CompoundState sa sb _) width height screen = CompoundState sa' sb' xb
where
sizesum = minSize c s height screen
wsum = let wsum = weight c
in if wsum > 0 then wsum else 1
surplus = width - sizesum
(xb, sa') = layoutWidget a sa
(_, sb') = layoutWidget b sb
layoutWidget w s = let wWidth = floor $ (fromIntegral $ minSize w s height screen) + (fromIntegral surplus)*(weight' w)/wsum
in (wWidth, layout w s wWidth height screen)
render (CompoundWidget a b) (CompoundState sa sb xb) x y w h screen = do
CompoundCache ca cb <- get
(surfacea, ca') <- liftIO $ flip runStateT ca $ render a sa x y xb h screen
(surfaceb, cb') <- liftIO $ flip runStateT cb $ render b sb (x+xb) y (w-xb) h screen
put $ CompoundCache ca' cb'
return $ surfacea ++ map (\(updated, SurfaceSlice x surface) -> (updated, SurfaceSlice (x+xb) surface)) surfaceb
handleMessage (CompoundWidget a b) (CompoundState sa sb xb) message = CompoundState (handleMessage a sa message) (handleMessage b sb message) xb
weight' :: (Widget a sa ca) => a -> Float
weight' = max 0 . weight
(<~>) :: (Widget a sa ca, Widget b sb cb) => a -> b -> CompoundWidget a sa ca b sb cb
a <~> b = CompoundWidget a b
data Separator = Separator !Int !Float deriving (Show, Eq)
instance Widget Separator () (RenderCache Separator ()) where
initWidget _ _ _ = return ()
initCache _ = createRenderCache $ \_ _ _ _ _ _ _ -> do
setOperator OperatorClear
paint
minSize (Separator s _) _ _ _ = s
weight (Separator _ w) = w
render = renderCached
separator :: Int -> Float -> Separator
separator = Separator
|
