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