{-# LANGUAGE DeriveDataTypeable, FlexibleInstances, MultiParamTypeClasses, PatternGuards #-}
----------------------------------------------------------------------------
-- |
-- Module : XMonad.Layout.MouseResizableTile
-- Copyright : (c) Jan Vornberger 2009
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : jan.vornberger@informatik.uni-oldenburg.de
-- Stability : unstable
-- Portability : not portable
--
-- A layout in the spirit of "XMonad.Layout.ResizableTile", but with the option
-- to use the mouse to adjust the layout.
--
-----------------------------------------------------------------------------
module XMonad.Layout.MouseResizableTile (
-- * Usage
-- $usage
mouseResizableTile,
mouseResizableTileMirrored,
MRTMessage (ShrinkSlave, ExpandSlave)
) where
import XMonad hiding (tile, splitVertically, splitHorizontallyBy)
import qualified XMonad.StackSet as W
import XMonad.Util.XUtils
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Layout.MouseResizableTile
--
-- Then edit your @layoutHook@ by adding the MouseResizableTile layout.
-- Either in its normal form or the mirrored version. (The mirror layout modifier
-- will not work correctly here because of the use of the mouse.)
--
-- > myLayout = mouseResizableTile ||| etc..
-- > main = xmonad defaultConfig { layoutHook = myLayout }
--
-- or
--
-- > myLayout = mouseResizableTileMirrored ||| etc..
-- > main = xmonad defaultConfig { layoutHook = myLayout }
--
-- For more detailed instructions on editing the layoutHook see:
--
-- "XMonad.Doc.Extending#Editing_the_layout_hook"
--
-- You may also want to add the following key bindings:
--
-- > , ((modm, xK_u), sendMessage ShrinkSlave) -- %! Shrink a slave area
-- > , ((modm, xK_i), sendMessage ExpandSlave) -- %! Expand a slave area
--
-- For detailed instruction on editing the key binding see:
--
-- "XMonad.Doc.Extending#Editing_key_bindings".
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 - mrtDraggerSize `div` 2) sh
rightHalf = Rectangle (sx + fromIntegral leftw + mrtDraggerOffset) sy
(sw - fromIntegral leftw - mrtDraggerSize `div` 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, Just x <- lookup ew draggers' = case x of
MasterDragger lb r -> mouseDrag' id lb r SetMasterFraction
LeftSlaveDragger lb r num -> mouseDrag' flip lb r (SetLeftSlaveFraction num)
RightSlaveDragger lb r num -> mouseDrag' flip lb r (SetRightSlaveFraction num)
where
chooseAxis isM' axis1 axis2 = if isM' then axis2 else axis1
mouseDrag' flp lowerBound range msg = flip mouseDrag (return ()) $ \x y -> do
let axis = flp (chooseAxis isM) x y
fraction = fromIntegral (axis - lowerBound) / range
sendMessage (msg fraction)
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
