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{-# LANGUAGE MultiParamTypeClasses, StandaloneDeriving, ExistentialQuantification, FlexibleInstances #-}
module Phi.Border ( BorderWidth(..)
, simpleBorderWidth
, borderH
, borderV
, BorderConfig(..)
, defaultBorderConfig
, drawBorder
, roundRectangle
, Border
, border
) where
import Phi.Types
import Phi.Widget
import Control.Monad
import Control.Monad.State.Strict
import Data.Maybe
import Graphics.Rendering.Cairo
data BorderWidth = BorderWidth { borderTop :: !Int
, borderRight :: !Int
, borderBottom :: !Int
, borderLeft :: !Int
} deriving (Show, Eq)
simpleBorderWidth :: Int -> BorderWidth
simpleBorderWidth w = BorderWidth w w w w
borderH :: BorderWidth -> Int
borderH bw = borderLeft bw + borderRight bw
borderV :: BorderWidth -> Int
borderV bw = borderTop bw + borderBottom bw
data BorderConfig = BorderConfig { margin :: !BorderWidth
, borderWidth :: !Int
, padding :: !BorderWidth
, borderColor :: !Color
, backgroundColor :: !Color
, cornerRadius :: !Int
, borderWeight :: !Float
} deriving (Show, Eq)
defaultBorderConfig = BorderConfig { margin = simpleBorderWidth 0
, borderWidth = 1
, padding = simpleBorderWidth 1
, borderColor = (0, 0, 0, 1)
, backgroundColor = (0, 0, 0, 0)
, cornerRadius = 0
, borderWeight = 1
}
data Border w s c d = (Widget w s c d) => Border !BorderConfig !w
data BorderCache w s c d = (Widget w s c d) => BorderCache !c
instance (Eq s, Display d) => Widget (Border w s c d) s (BorderCache w s c d) d where
initWidget (Border _ w) = initWidget w
initCache (Border _ w) = BorderCache $ initCache w
minSize (Border config w) s height screen =
case True of
_ | childSize == 0 -> 0
| otherwise -> max (borderH m+2*(bw+cr)) (childSize + borderH p + 2*bw + borderH m)
where
childSize = minSize w s height' screen
m = margin config
bw = borderWidth config
p = padding config
cr = cornerRadius config
height' = height - borderV m - 2*bw - borderV p
weight (Border config _) = borderWeight config
render (Border config w) s x y width height screen = case () of
_ | (width > borderH m - 2*bw - borderH p) -> do
border <- liftIO $ createImageSurface FormatARGB32 width height
renderWith border $ do
setOperator OperatorClear
paint
setOperator OperatorOver
drawBorder config 0 0 width height
BorderCache c <- get
(surfaces, c') <- liftIO $ flip runStateT c $ render w s (x+dx) (y+dy) width' height' screen
put $ BorderCache c'
let surfaces' = (True, 0, Nothing):(map (\(updated, SurfaceSlice x surf) -> (updated, x+dx, Just surf)) surfaces)++[(True, width-rightWidth, Nothing)]
surfacesWidths = zipWith (\(updated, x, surf) (_, x', _) -> (updated, x, x'-x, surf)) surfaces' (tail surfaces' ++ [(False, width, Nothing)])
forM surfacesWidths $ \(updated, x, surfWidth, surf) -> do
surf' <- liftIO $ createImageSurface FormatARGB32 surfWidth height
renderWith surf' $ do
setOperator OperatorClear
paint
setOperator OperatorOver
save
translate (fromIntegral (-x)) 0
withPatternForSurface border setSource
paint
restore
case surf of
Just surface -> do
translate 0 (fromIntegral dy)
withPatternForSurface surface setSource
paint
Nothing -> return ()
return (updated, SurfaceSlice x surf')
| otherwise -> do
surface <- liftIO $ createImageSurface FormatARGB32 width height
return [(True, SurfaceSlice 0 surface)]
where
m = margin config
bw = borderWidth config
p = padding config
leftWidth = borderLeft m + bw + borderLeft p
rightWidth = borderRight m + bw + borderRight p
dx = leftWidth
dy = borderTop m + bw + borderTop p
width' = width - borderH m - 2*bw - borderH p
height' = height - borderV m - 2*bw - borderV p
handleMessage (Border _ w) = handleMessage w
drawBorder :: BorderConfig -> Int -> Int -> Int -> Int -> Render ()
drawBorder config dx dy w h = do
roundRectangle x y width height radius
save
setSourceRGBA fr fg fb fa
fillPreserve
setSourceRGBA br bg bb ba
setLineWidth $ fromIntegral bw
strokePreserve
restore
where
m = margin config
bw = borderWidth config
p = padding config
radius = fromIntegral $ cornerRadius config
x = (fromIntegral dx) + (fromIntegral $ borderLeft m) + (fromIntegral bw)/2
y = (fromIntegral dy) + (fromIntegral $ borderTop m) + (fromIntegral bw)/2
width = fromIntegral $ w - borderH m - bw
height = fromIntegral $ h - borderV m - bw
(br, bg, bb, ba) = borderColor config
(fr, fg, fb, fa) = backgroundColor config
roundRectangle :: Double -> Double -> Double -> Double -> Double -> Render ()
roundRectangle x y width height radius = do
newPath
arc (x + width - radius) (y + radius) radius (-pi/2) 0
arc (x + width - radius) (y + height - radius) radius 0 (pi/2)
arc (x + radius) (y + height - radius) radius (pi/2) pi
arc (x + radius) (y + radius) radius pi (pi*3/2)
closePath
border :: (Widget w s c d) => BorderConfig -> w -> Border w s c d
border = Border
|
