aboutsummaryrefslogtreecommitdiffstats
path: root/XMonad/Layout/MouseResizableTile.hs
blob: 8c0b7f85fc875858af7d87173fbdf0b2057a5737 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
{-# 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
        io . flip lowerWindow draggerWin =<< asks display
        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