module XMonad.Layout.MouseResizableTile (
mouseResizableTile,
mouseResizableTileMirrored,
MRTMessage (ShrinkSlave, ExpandSlave)
) where
import XMonad hiding (tile, splitVertically, splitHorizontallyBy)
import qualified XMonad.StackSet as W
import XMonad.Util.XUtils
data MRTMessage = SetMasterFraction Rational
| SetLeftSlaveFraction Int Rational
| SetRightSlaveFraction Int Rational
| ShrinkSlave
| ExpandSlave
deriving Typeable
instance Message MRTMessage
data DraggerInfo = MasterDragger Position Rational
| LeftSlaveDragger Position Rational Int
| RightSlaveDragger Position Rational Int
deriving (Show, Read)
type DraggerWithRect = (Rectangle, Glyph, DraggerInfo)
type DraggerWithWin = (Window, DraggerInfo)
data MouseResizableTile a = MRT { nmaster :: Int,
masterFrac :: Rational,
leftFracs :: [Rational],
rightFracs :: [Rational],
draggers :: [DraggerWithWin],
focusPos :: Int,
numWindows :: Int,
isMirrored :: Bool
} deriving (Show, Read)
mrtFraction :: Rational
mrtFraction = 0.5
mrtDelta :: Rational
mrtDelta = 0.03
mrtDraggerOffset :: Position
mrtDraggerOffset = 3
mrtDraggerSize :: Dimension
mrtDraggerSize = 6
mrtHDoubleArrow :: Glyph
mrtHDoubleArrow = 108
mrtVDoubleArrow :: Glyph
mrtVDoubleArrow = 116
mouseResizableTile :: MouseResizableTile a
mouseResizableTile = MRT 1 mrtFraction [] [] [] 0 0 False
mouseResizableTileMirrored :: MouseResizableTile a
mouseResizableTileMirrored= MRT 1 mrtFraction [] [] [] 0 0 True
instance LayoutClass MouseResizableTile a where
doLayout state sr (W.Stack w l r) =
let wins = reverse l ++ w : r
num = length wins
sr' = mirrorAdjust sr (mirrorRect sr)
(rects, preparedDraggers) = tile (nmaster state) (masterFrac state)
((leftFracs state) ++ repeat mrtFraction)
((rightFracs state) ++ repeat mrtFraction) sr' num
rects' = map (mirrorAdjust id mirrorRect . sanitizeRectangle sr') rects
in do
mapM_ deleteDragger $ draggers state
newDraggers <- mapM (createDragger sr . adjustForMirror (isMirrored state)) preparedDraggers
return (zip wins rects', Just $ state { draggers = newDraggers,
focusPos = length l,
numWindows = length wins })
where
mirrorAdjust a b = if (isMirrored state)
then b
else a
handleMessage state m
| Just (IncMasterN d) <- fromMessage m =
return $ Just $ state { nmaster = max 0 (nmaster state + d) }
| Just (Shrink) <- fromMessage m =
return $ Just $ state { masterFrac = max 0 (masterFrac state mrtDelta) }
| Just (Expand) <- fromMessage m =
return $ Just $ state { masterFrac = min 1 (masterFrac state + mrtDelta) }
| Just ShrinkSlave <- fromMessage m =
return $ Just $ modifySlave state (mrtDelta)
| Just ExpandSlave <- fromMessage m =
return $ Just $ modifySlave state mrtDelta
| Just (SetMasterFraction f) <- fromMessage m =
return $ Just $ state { masterFrac = max 0 (min 1 f) }
| Just (SetLeftSlaveFraction pos f) <- fromMessage m =
return $ Just $ state { leftFracs = replaceAtPos (leftFracs state) pos (max 0 (min 1 f)) }
| Just (SetRightSlaveFraction pos f) <- fromMessage m =
return $ Just $ state { rightFracs = replaceAtPos (rightFracs state) pos (max 0 (min 1 f)) }
| Just e <- fromMessage m :: Maybe Event = handleResize (draggers state) (isMirrored state) e >> return Nothing
| Just Hide <- fromMessage m = releaseResources >> return (Just $ state { draggers = [] })
| Just ReleaseResources <- fromMessage m = releaseResources >> return (Just $ state { draggers = [] })
where releaseResources = mapM_ deleteDragger $ draggers state
handleMessage _ _ = return Nothing
description _ = "MouseResizableTile"
adjustForMirror :: Bool -> DraggerWithRect -> DraggerWithRect
adjustForMirror False dragger = dragger
adjustForMirror True (draggerRect, draggerCursor, draggerInfo) =
(mirrorRect draggerRect, draggerCursor', draggerInfo)
where
draggerCursor' = if (draggerCursor == mrtHDoubleArrow)
then mrtVDoubleArrow
else mrtHDoubleArrow
modifySlave :: MouseResizableTile a -> Rational-> MouseResizableTile a
modifySlave state delta =
let pos = focusPos state
num = numWindows state
nmaster' = nmaster state
leftFracs' = leftFracs state
rightFracs' = rightFracs state
draggersLeft = nmaster' 1
draggersRight = (num nmaster') 1
in if pos < nmaster'
then if draggersLeft > 0
then let draggerPos = min (draggersLeft 1) pos
oldFraction = (leftFracs' ++ repeat mrtFraction) !! draggerPos
in state { leftFracs = replaceAtPos leftFracs' draggerPos
(max 0 (min 1 (oldFraction + delta))) }
else state
else if draggersRight > 0
then let draggerPos = min (draggersRight 1) (pos nmaster')
oldFraction = (rightFracs' ++ repeat mrtFraction) !! draggerPos
in state { rightFracs = replaceAtPos rightFracs' draggerPos
(max 0 (min 1 (oldFraction + delta))) }
else state
replaceAtPos :: (Num t) => [Rational] -> t -> Rational -> [Rational]
replaceAtPos [] 0 x' = [x']
replaceAtPos [] pos x' = mrtFraction : replaceAtPos [] (pos 1) x'
replaceAtPos (_:xs) 0 x' = x' : xs
replaceAtPos (x:xs) pos x' = x : replaceAtPos xs (pos 1 ) x'
sanitizeRectangle :: Rectangle -> Rectangle -> Rectangle
sanitizeRectangle (Rectangle sx sy swh sht) (Rectangle x y wh ht) =
(Rectangle (within 0 (sx + fromIntegral swh) x) (within 0 (sy + fromIntegral sht) y)
(within 1 swh wh) (within 1 sht ht))
within :: (Ord a) => a -> a -> a -> a
within low high a = max low $ min high a
tile :: Int -> Rational -> [Rational] -> [Rational] -> Rectangle -> Int -> ([Rectangle], [DraggerWithRect])
tile nmaster' masterFrac' leftFracs' rightFracs' sr num
| num <= nmaster' = splitVertically (take (num 1) leftFracs') sr True 0
| nmaster' == 0 = splitVertically (take (num 1) rightFracs') sr False 0
| otherwise = (leftRects ++ rightRects, [masterDragger] ++ leftDraggers ++ rightDraggers)
where ((sr1, sr2), masterDragger) = splitHorizontallyBy masterFrac' sr
(leftRects, leftDraggers) = splitVertically (take (nmaster' 1) leftFracs') sr1 True 0
(rightRects, rightDraggers) = splitVertically (take (num nmaster' 1) rightFracs') sr2 False 0
splitVertically :: RealFrac r => [r] -> Rectangle -> Bool -> Int -> ([Rectangle], [DraggerWithRect])
splitVertically [] r _ _ = ([r], [])
splitVertically (f:fx) (Rectangle sx sy sw sh) isLeft num =
let nextRect = Rectangle sx sy sw (smallh (div mrtDraggerSize 2))
(otherRects, otherDragger) = splitVertically fx
(Rectangle sx (sy + fromIntegral smallh + mrtDraggerOffset)
sw (sh smallh (div mrtDraggerSize 2)))
isLeft (num + 1)
draggerRect = Rectangle sx (sy + fromIntegral smallh mrtDraggerOffset) sw mrtDraggerSize
draggerInfo = if isLeft
then LeftSlaveDragger sy (fromIntegral sh) num
else RightSlaveDragger sy (fromIntegral sh) num
nextDragger = (draggerRect, mrtVDoubleArrow, draggerInfo)
in (nextRect : otherRects, nextDragger : otherDragger)
where smallh = floor $ fromIntegral sh * f
splitHorizontallyBy :: RealFrac r => r -> Rectangle -> ((Rectangle, Rectangle), DraggerWithRect)
splitHorizontallyBy f (Rectangle sx sy sw sh) = ((leftHalf, rightHalf), (draggerRect, mrtHDoubleArrow, draggerInfo))
where leftw = floor $ fromIntegral sw * f
leftHalf = Rectangle sx sy (leftw (div mrtDraggerSize 2)) sh
rightHalf = Rectangle (sx + fromIntegral leftw + mrtDraggerOffset) sy
(sw fromIntegral leftw (div mrtDraggerSize 2)) sh
draggerRect = Rectangle (sx + fromIntegral leftw mrtDraggerOffset) sy mrtDraggerSize sh
draggerInfo = MasterDragger sx (fromIntegral sw)
createDragger :: Rectangle -> DraggerWithRect -> X DraggerWithWin
createDragger sr (draggerRect, draggerCursor, draggerInfo) = do
draggerWin <- createInputWindow draggerCursor $ sanitizeRectangle sr draggerRect
return (draggerWin, draggerInfo)
deleteDragger :: DraggerWithWin -> X ()
deleteDragger (draggerWin, _) = deleteWindow draggerWin
handleResize :: [DraggerWithWin] -> Bool -> Event -> X ()
handleResize draggers' isM ButtonEvent { ev_window = ew, ev_event_type = et }
| et == buttonPress = do
case (lookup ew draggers') of
Just (MasterDragger lowerBound range) -> do
mouseDrag (\x y -> do
let axis = chooseAxis isM x y
fraction = fromIntegral (axis lowerBound) / range
sendMessage (SetMasterFraction fraction)) (return ())
Just (LeftSlaveDragger lowerBound range num) -> do
mouseDrag (\x y -> do
let axis = chooseAxis isM y x
fraction = fromIntegral (axis lowerBound) / range
sendMessage (SetLeftSlaveFraction num fraction)) (return ())
Just (RightSlaveDragger lowerBound range num) -> do
mouseDrag (\x y -> do
let axis = chooseAxis isM y x
fraction = fromIntegral (axis lowerBound) / range
sendMessage (SetRightSlaveFraction num fraction)) (return ())
Nothing -> return ()
where
chooseAxis isM' axis1 axis2 = if isM' then axis2 else axis1
handleResize _ _ _ = return ()
createInputWindow :: Glyph -> Rectangle -> X Window
createInputWindow cursorGlyph r = withDisplay $ \d -> do
win <- mkInputWindow d r
io $ selectInput d win (exposureMask .|. buttonPressMask)
cursor <- io $ createFontCursor d cursorGlyph
io $ defineCursor d win cursor
io $ freeCursor d cursor
showWindow win
return win
mkInputWindow :: Display -> Rectangle -> X Window
mkInputWindow d (Rectangle x y w h) = do
rw <- asks theRoot
let screen = defaultScreenOfDisplay d
visual = defaultVisualOfScreen screen
attrmask = cWOverrideRedirect
io $ allocaSetWindowAttributes $
\attributes -> do
set_override_redirect attributes True
createWindow d rw x y w h 0 0 inputOnly visual attrmask attributes