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{-# LANGUAGE TypeFamilies #-}
module Phi.Widgets.AlphaBox ( alphaBox
) where
import Phi.Types
import Phi.Widget
import Control.Monad
import Graphics.Rendering.Cairo
data AlphaBoxState = AlphaBoxState [WidgetState] deriving Show
data AlphaBox = AlphaBox Double [Widget] deriving Show
instance WidgetClass AlphaBox where
type WidgetData AlphaBox = AlphaBoxState
initWidget (AlphaBox _ widgets) phi disp = liftM AlphaBoxState $ mapM (createWidgetState phi disp) widgets
minSize (AlphaBox _ _) (AlphaBoxState widgetStates) height screen =
sum (map (\(WidgetState {stateWidget = w, statePrivateData = priv}) -> minSize w priv height screen) widgetStates)
weight (AlphaBox _ widgets) = sum (map (\(Widget w) -> weight w) widgets)
layout (AlphaBox _ _) (AlphaBoxState widgetStates) width height screen = AlphaBoxState $ layoutWidgets widgetStates 0 0 width height screen
render (AlphaBox alpha _) (AlphaBoxState widgetStates) w h screen = do
renderWithSimilarSurface ContentColorAlpha w h $ \surface -> do
renderWith surface $ do
renderWidgets widgetStates screen
setOperator OperatorDestIn
setSourceRGBA 0 0 0 alpha
paint
withPatternForSurface surface setSource
paint
handleMessage _ (AlphaBoxState widgetStates) m = AlphaBoxState $ handleMessageWidgets m widgetStates
alphaBox :: Double -> [Widget] -> Widget
alphaBox alpha = Widget . AlphaBox alpha
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