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{-# LANGUAGE ExistentialQuantification, StandaloneDeriving, MultiParamTypeClasses, FunctionalDependencies, TypeSynonymInstances, FlexibleInstances, TypeFamilies #-}
module Phi.Widget ( Rectangle(..)
, Display(..)
, 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.Monad
import Control.Monad.State.Strict hiding (lift)
import Control.Monad.IO.Class
import Data.Maybe
import Data.Typeable
import Graphics.Rendering.Cairo
import Phi.Phi
import Phi.X11.Atoms
data Rectangle = Rectangle { rect_x :: !Int
, rect_y :: !Int
, rect_width :: !Int
, rect_height :: !Int
} deriving (Show, Eq)
class Display d where
type Window d :: *
unionArea :: Rectangle -> Rectangle -> Int
unionArea a b = uw*uh
where
uw = max 0 $ (min ax2 bx2) - (max ax1 bx1)
uh = max 0 $ (min ay2 by2) - (max ay1 by1)
Rectangle ax1 ay1 aw ah = a
Rectangle bx1 by1 bw bh = b
ax2 = ax1 + aw
ay2 = ay1 + ah
bx2 = bx1 + bw
by2 = by1 + bh
data SurfaceSlice = SurfaceSlice !Int !Surface
class (Eq s, Display d) => Widget w s c d | w -> s, w -> c, w -> d where
initWidget :: w -> Phi -> d -> [(Rectangle, Window d)] -> IO s
initCache :: w -> c
minSize :: w -> s -> Int -> Rectangle -> Int
weight :: w -> Float
weight _ = 0
render :: w -> s -> Int -> Int -> Int -> Int -> Rectangle -> StateT c IO [(Bool, SurfaceSlice)]
handleMessage :: w -> s -> Message -> s
handleMessage _ priv _ = priv
type IOCache = CacheArrow (Kleisli IO)
type RenderCache s = IOCache (s, Int, Int, Int, Int, 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 :: (s -> Int -> Int -> Int -> Int -> Rectangle -> Render ())
-> CacheArrow (Kleisli IO) (s, Int, Int, Int, Int, Rectangle) Surface
createRenderCache f = lift . Kleisli $ \(state, x, y, w, h, screen) -> do
surface <- createImageSurface FormatARGB32 w h
renderWith surface $ do
setOperator OperatorClear
paint
setOperator OperatorOver
f state x y w h screen
return surface
renderCached :: Eq s => s -> Int -> Int -> Int -> Int -> Rectangle -> StateT (RenderCache s) IO [(Bool, SurfaceSlice)]
renderCached state x y w h screen = do
cache <- get
(surf, updated, cache') <- liftIO $ runKleisli (runCache' cache) (state, x, y, w, h, screen)
put cache'
return [(updated, SurfaceSlice 0 surf)]
data CompoundWidget a sa ca b sb cb d = (Widget a sa ca d, Widget b sb cb d) => CompoundWidget !a !b
data CompoundState a sa ca b sb cb d = (Widget a sa ca d, Widget b sb cb d) => CompoundState !sa !sb
deriving instance Eq (CompoundState a sa ca b sb cb d)
data CompoundCache a sa ca b sb cb d = (Widget a sa ca d, Widget b sb cb d) => CompoundCache !ca !cb
instance Display d => Widget (CompoundWidget a sa ca b sb cb d) (CompoundState a sa ca b sb cb d) (CompoundCache a sa ca b sb cb d) d where
initWidget (CompoundWidget a b) phi disp screens = liftM2 CompoundState (initWidget a phi disp screens) (initWidget b phi disp screens)
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
render c@(CompoundWidget a b) s@(CompoundState sa sb) x y w h screen = do
let sizesum = minSize c s h screen
wsum = let wsum = weight c
in if wsum > 0 then wsum else 1
surplus = w - sizesum
xb = floor $ (fromIntegral $ minSize a sa h screen) + (fromIntegral surplus)*(weight' a)/wsum
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) message = CompoundState (handleMessage a sa message) (handleMessage b sb message)
weight' :: (Widget a sa ca d) => a -> Float
weight' = max 0 . weight
(<~>) :: (Widget a sa ca d, Widget b sb cb d) => a -> b -> CompoundWidget a sa ca b sb cb d
a <~> b = CompoundWidget a b
data Separator d = Separator !Int !Float deriving (Show, Eq)
instance Display d => Widget (Separator d) () (RenderCache ()) d where
initWidget _ _ _ _ = return ()
initCache _ = createRenderCache $ \_ _ _ _ _ _ -> do
setOperator OperatorClear
paint
minSize (Separator s _) _ _ _ = s
weight (Separator _ w) = w
render _ = renderCached
separator :: Int -> Float -> Separator d
separator = Separator
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