summaryrefslogtreecommitdiffstats
path: root/lib/Phi/Widgets/Taskbar.hs
blob: f0a81967d7b39153a30bb02b8fc38664a8c28d94 (plain)
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
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
{-# LANGUAGE MultiParamTypeClasses, DeriveDataTypeable, TypeSynonymInstances, FlexibleInstances #-}

module Phi.Widgets.Taskbar ( IconStyle
                           , idIconStyle
                           , desaturateIconStyle
                           , TaskStyle(..)
                           , DesktopStyle(..)
                           , TaskbarConfig(..)
                           , defaultTaskbarConfig
                           , Taskbar
                           , taskbar
                           ) where

import Control.Arrow
import Control.Concurrent
import Control.Monad
import Control.Monad.State.Strict
import Control.Monad.Trans

import Data.Array.MArray
import Data.Bits
import Data.Char
import Data.Function
import Data.IORef
import Data.List
import Data.Maybe
import Data.Typeable
import Data.Unique
import Data.Word
import qualified Data.Accessor.Basic as A
import qualified Data.Accessor.Container as AC
import qualified Data.Map as M

import Foreign.C.Types

import Graphics.Rendering.Cairo
import Graphics.Rendering.Pango.Cairo
import Graphics.Rendering.Pango.Enums (PangoRectangle(..))
import Graphics.Rendering.Pango.Layout
import Graphics.Rendering.Pango.Font

import Graphics.XHB
import Graphics.XHB.Gen.Xproto

import Codec.Binary.UTF8.String

import Phi.Phi
import Phi.Types
import Phi.Border
import Phi.Widget
import Phi.X11.Atoms
import Phi.X11.Util


newtype IconStyle = IconStyle { withIconStyle :: Surface -> Render () }
instance Eq IconStyle where
  _ == _ = True

idIconStyle :: IconStyle
idIconStyle = IconStyle $ flip withPatternForSurface setSource

desaturateIconStyle :: Double -> IconStyle
desaturateIconStyle v = IconStyle $ \icon -> do
  w <- imageSurfaceGetWidth icon
  h <- imageSurfaceGetHeight icon
  
  renderWithSimilarSurface ContentColorAlpha w h $ \surface -> do
    renderWith surface $ do
      setOperator OperatorAdd
      withPatternForSurface icon setSource
      paint
      
      setSourceRGB 0 0 0
      paint
      
      setOperator OperatorHslSaturation
      setSourceRGBA 0 0 0 (1-v)
      paint
      
      setOperator OperatorDestIn
      withPatternForSurface icon setSource
      paint
    
    withPatternForSurface surface setSource


downscaled :: Double -> Surface -> Render ()
downscaled s surface = do
  case True of
    _ | s < 0.5 -> do
      w <- imageSurfaceGetWidth surface
      h <- imageSurfaceGetHeight surface
      
      renderWithSimilarSurface ContentColorAlpha (ceiling (fromIntegral w*s)) (ceiling (fromIntegral h*s)) $ \surface' -> do
        renderWith surface' $ do
          scale 0.5 0.5
          downscaled (2*s) surface
          paint
        withPatternForSurface surface' setSource
      
      | otherwise -> do
      scale s s
      withPatternForSurface surface setSource


data TaskStyle = TaskStyle { taskFont      :: !String
                           , taskColor     :: !Color
                           , taskBorder    :: !BorderConfig
                           , taskIconStyle :: !IconStyle
                           } deriving Eq

data DesktopStyle = DesktopStyle { desktopFont       :: !String
                                 , desktopLabelWidth :: !Int
                                 , desktopLabelGap   :: !Int
                                 , desktopColor      :: !Color
                                 , desktopBorder     :: !BorderConfig
                                 }

data TaskbarConfig = TaskbarConfig { taskMaxSize      :: !Int
                                   , normalTaskStyle  :: !TaskStyle
                                   , activeTaskStyle  :: !TaskStyle
                                   , desktopStyle     :: !(Maybe (DesktopStyle, DesktopStyle))
                                   }

defaultStyle :: TaskStyle
defaultStyle = TaskStyle { taskFont = "Sans 8"
                         , taskColor = (0, 0, 0, 1)
                         , taskBorder = defaultBorderConfig { backgroundColor = (0.75, 0.75, 0.75, 1) }
                         , taskIconStyle = idIconStyle
                         }

defaultTaskbarConfig :: TaskbarConfig
defaultTaskbarConfig = TaskbarConfig { taskMaxSize = 200
                                     , normalTaskStyle = defaultStyle
                                     , activeTaskStyle = defaultStyle {taskBorder = defaultBorderConfig { borderColor = (1, 1, 1, 1) }}
                                     , desktopStyle = Nothing
                                     }

data Taskbar = Taskbar TaskbarConfig

data TaskbarState = TaskbarState { taskbarScreens           :: ![RECTANGLE]
                                 , taskbarActiveWindow      :: !WINDOW
                                 , taskbarDesktopCount      :: !Int
                                 , taskbarCurrentDesktop    :: !Int
                                 , taskbarDesktopNames      :: ![String]
                                 , taskbarWindows           :: ![WINDOW]
                                 , taskbarWindowStates      :: !(M.Map WINDOW WindowState)
                                 } deriving Eq

data Icon = Icon !Unique !Int !Surface
instance Eq Icon where (Icon a _ _) == (Icon b _ _) = a == b
instance Show Icon where show (Icon _ size _) = "Icon { size = " ++ (show size) ++ " }"

createIcon :: Int -> Surface -> IO Icon
createIcon size surface = do
  id <- newUnique
  return $ Icon id size surface


data WindowState = WindowState { windowTitle    :: !String
                               , windowDesktop  :: !Int
                               , windowVisible  :: !Bool
                               , windowIcons    :: ![Icon]
                               , windowGeometry :: !RECTANGLE
                               } deriving (Eq, Show)

data WindowCache = WindowCache { createScaledIconCached :: !(IOCache ([Icon], Int) (Maybe Icon))
                               , renderWindowCached     :: !(IOCache (String, Maybe Icon, TaskStyle, Int, Int) Surface)
                               }

createScaledIconCached' = A.fromSetGet (\a cache -> cache {createScaledIconCached = a}) createScaledIconCached
renderWindowCached' = A.fromSetGet (\a cache -> cache {renderWindowCached = a}) renderWindowCached


newtype DesktopCache = DesktopCache (IOCache () ())

emptyWindowCache :: WindowCache
emptyWindowCache = WindowCache { createScaledIconCached = createIOCache createScaledIcon
                               , renderWindowCached     = createIOCache doRenderWindow
                               }

data TaskbarCache = TaskbarCache { desktopCaches :: !(M.Map Int DesktopCache)
                                 , windowCaches  :: !(M.Map WINDOW WindowCache)
                                 }

-- substitute for the liftT function in Data.Accessor.MonadState that uses the strict StateT variant
liftT :: (Monad m) => A.T r s -> StateT s m a -> StateT r m a
liftT f m = do
  s0 <- gets $ A.get f
  (a,s1) <- lift $ runStateT m s0
  modify $ A.set f s1
  return a

liftIOStateT :: (MonadIO m) => StateT s IO a -> StateT s m a
liftIOStateT m = do 
  s0 <- get
  (a,s1) <- liftIO $ runStateT m s0
  put s1
  return a

cached :: (MonadIO m, Eq a) => A.T s (IOCache a b) -> a -> StateT s m b
cached t = liftT t . liftIOStateT . runIOCache

data TaskbarMessage = WindowListUpdate ![WINDOW] !(M.Map WINDOW WindowState)
                    | DesktopCountUpdate !Int
                    | CurrentDesktopUpdate !Int
                    | DesktopNamesUpdate ![String]
                    | ActiveWindowUpdate !WINDOW
                    deriving (Typeable, Show)

instance Widget Taskbar TaskbarState (M.Map WINDOW WindowCache) where
  initWidget (Taskbar _) phi dispvar screens = do
    phi' <- dupPhi phi
    forkIO $ taskbarRunner phi' dispvar
    
    return $ TaskbarState (map fst screens) (fromXid xidNone) 0 (-1) [] [] M.empty
  
  initCache _ = M.empty
    
  minSize _ _ _ _ = 0
  weight _ = 1
  
  render (Taskbar config) TaskbarState { taskbarScreens = screens
                                       , taskbarActiveWindow = activeWindow
                                       , taskbarDesktopCount = desktopCount
                                       , taskbarCurrentDesktop = currentDesktop
                                       , taskbarDesktopNames = desktopNames
                                       , taskbarWindows = windows
                                       , taskbarWindowStates = windowStates
                                       } _ _ w h screen = do
    let windowScreen w = maximumBy (compare `on` unionArea (windowGeometry w)) screens
        screenWindows  = filter ((== Just screen) . fmap windowScreen . flip M.lookup windowStates) windows
        desktopNumbers = take desktopCount $ zip [0..] (desktopNames ++ repeat "")
        desktops       = map (\desktop -> (desktop, filter (fromMaybe False . fmap (windowOnDesktop . fst $ desktop) . flip M.lookup windowStates) screenWindows)) desktopNumbers
        
        windowCount    = sum $ map (length . snd) $ desktops
        
        dstyle d       = fmap (if d == currentDesktop then snd else fst) $ desktopStyle config
        dlabelwidth d  = fromMaybe 0 $ fmap desktopLabelWidth $ dstyle d
        gap d ds       = if null (snd $ desktops !! d) then 0 else desktopLabelGap ds
        dleftwidth d   = fromMaybe 0 $ fmap (\ds@DesktopStyle {desktopBorder = border}
                                             -> (borderLeft $ margin border) + (borderWidth border) + (borderLeft $ padding border)
                                                + dlabelwidth d + gap d ds) $ dstyle d
        dwidth d       = fromMaybe 0 $ fmap (\ds@DesktopStyle {desktopBorder = border}
                                             -> (borderH $ margin border) + 2*(borderWidth border) + (borderH $ padding border)
                                                + dlabelwidth d + gap d ds) $ dstyle d
        
        desktopsWidth  = sum $ map (dwidth . fst) desktopNumbers
        windowWidth    = if windowCount == 0 then 0 else min (taskMaxSize config) ((w - desktopsWidth) `div` windowCount)
    
    surface <- liftIO $ createImageSurface FormatARGB32 w h
    cache <- liftM (M.filterWithKey $ \w _ -> elem w windows) get
    cache' <- renderWith surface $ flip execStateT cache $ do
      lift $ do
        setOperator OperatorClear
        paint
        
        setOperator OperatorOver
      
      flip (flip foldM_ 0) desktops $ \nwindows (desktop, desktopWindows) -> do
        let dstyle' = dstyle (fst desktop)
            dx = dleftwidth (fst desktop) + (sum $ map dwidth $ take (fst desktop) [0..]) + nwindows*windowWidth
        
        case dstyle' of
          Just ds -> do
            let (r, g, b, a) = desktopColor ds
            lift $ do
              save
              drawBorder (desktopBorder ds) (dx - dleftwidth (fst desktop)) 0 (dwidth (fst desktop) + windowWidth * length desktopWindows) h
              clip
              
              setSourceRGBA r g b a
              renderText (desktopFont ds) (fromIntegral (dx - dlabelwidth (fst desktop) - gap (fst desktop) ds)) 0 (dlabelwidth (fst desktop)) h $ snd desktop
              
              restore
            
            forM_ (zip [0..] desktopWindows) $ \(i, window) -> do
              let style = (if window == activeWindow then activeTaskStyle else normalTaskStyle) config
                  h' = h - (borderV $ margin $ desktopBorder ds) - 2*(borderWidth $ desktopBorder ds) - (borderV $ padding $ desktopBorder ds)
                  mstate = M.lookup window windowStates
                  x = dx + i*windowWidth
                  y = (borderTop $ margin $ desktopBorder ds) + (borderWidth $ desktopBorder ds) + (borderTop $ padding $ desktopBorder ds)
              
              case mstate of
                Just state -> do
                  windowSurface <- liftT (AC.mapDefault emptyWindowCache window) . liftIOStateT $ renderWindow state style windowWidth h'
                  lift $ do
                    save
                    translate (fromIntegral $ x - 5) (fromIntegral $ y - 5)
                    withPatternForSurface windowSurface setSource
                    paint
                    restore
            
                Nothing -> return ()
        
          _ -> return ()
      
        return $ nwindows + length desktopWindows
    put cache'
    
    return [(True, SurfaceSlice 0 surface)]
      
  
  handleMessage _ priv m = case (fromMessage m) of
    Just (WindowListUpdate windows windowStates) -> priv { taskbarWindows = windows
                                                         , taskbarWindowStates = windowStates
                                                         }
    Just (DesktopCountUpdate count) -> priv {taskbarDesktopCount = count}
    Just (CurrentDesktopUpdate current) -> priv {taskbarCurrentDesktop = current}
    Just (DesktopNamesUpdate names) -> priv {taskbarDesktopNames = names}
    Just (ActiveWindowUpdate window) -> priv {taskbarActiveWindow = window}
    _ -> case (fromMessage m) of
      Just (UpdateScreens screens) -> priv {taskbarScreens = map fst screens}
      _ -> priv


renderText :: String -> Int -> Int -> Int -> Int -> String -> Render ()
renderText font x y w h text = do
  layout <- createLayout ""
  (_, PangoRectangle _ _ textWidth textHeight) <- liftIO $ do
    layoutSetMarkup layout $ "<span font='" ++ font ++ "'>" ++ (escapeMarkup text) ++ "</span>"
    layoutSetWidth layout $ Just $ fromIntegral w
    layoutSetEllipsize layout EllipsizeEnd
    
    layoutGetExtents layout
  
  
  moveTo ((fromIntegral x) + ((fromIntegral w) - textWidth)/2) ((fromIntegral y) + ((fromIntegral h) - textHeight)/2)
  showLayout layout

renderWindow :: WindowState -> TaskStyle -> Int -> Int -> StateT WindowCache IO Surface
renderWindow state style w h = do
  let h' = h - (borderV $ margin $ taskBorder style)
  
  scaledIcon <- cached createScaledIconCached' (windowIcons state, h')
  cached renderWindowCached' (windowTitle state, scaledIcon, style, w, h)

doRenderWindow :: (String, Maybe Icon, TaskStyle, Int, Int) -> IO Surface
doRenderWindow (title, scaledIcon, style, w, h) = do
  let (r, g, b, a) = taskColor style
      leftBorder = (borderLeft $ margin $ taskBorder style) + (borderWidth $ taskBorder style) + (borderLeft $ padding $ taskBorder style)
      rightBorder = (borderRight $ margin $ taskBorder style) + (borderWidth $ taskBorder style) + (borderRight $ padding $ taskBorder style)
      h' = h - (borderV $ margin $ taskBorder style)
  
  surface <- createImageSurface FormatARGB32 (w+10) (h+10)
  renderWith surface $ do
    translate 5 5
    
    save
    drawBorder (taskBorder style) 0 0 w h
    clip
    
    setSourceRGBA r g b a
    renderText (taskFont style) (fromIntegral (leftBorder + h' + 3)) 0 (w - leftBorder - h' - 3 - rightBorder) h title
    
    restore
    
    case scaledIcon of
      Just (Icon _ _ icon) -> do
        save
        translate (fromIntegral leftBorder) (fromIntegral . borderTop . margin . taskBorder $ style)
        withIconStyle (taskIconStyle style) icon
        paint
        restore
    
      _ -> return ()
  
  return surface
                

createScaledIcon :: ([Icon], Int) -> IO (Maybe Icon)
createScaledIcon (icons, h) = do
  case bestIcon of
    Just (Icon _ _ icon) -> do
      scaledIcon <- createSimilarSurface icon ContentColorAlpha h h
      renderWith scaledIcon $ do
        imageW <- imageSurfaceGetWidth icon
        imageH <- imageSurfaceGetHeight icon
        
        let scalef = (fromIntegral h)/(fromIntegral $ max imageW imageH)
        
        case () of
          _ | imageH < imageW -> translate 0 (fromIntegral (imageW-imageH)*scalef/2)
            | otherwise -> translate (fromIntegral (imageH-imageW)*scalef/2) 0
        
        downscaled scalef icon
        paint
      fmap Just $ createIcon h scaledIcon
          
    _ -> return Nothing
  
  where
    bestIcon = listToMaybe $ sortBy compareIcons icons
    compareIcons = flip (compare `on` (\(Icon _ size _) -> size))


windowOnDesktop :: Int -> WindowState -> Bool
windowOnDesktop desktop state = (windowVisible state) && (desktop == windowDesktop state)


taskbarRunner :: Phi -> Display -> IO ()
taskbarRunner phi dispvar = do
  (windows, states) <- liftIO $ withDisplay dispvar $ \disp -> do
    (windows, states) <- getWindowStates disp (getAtoms dispvar) M.empty
    desktopCount <- getDesktopCount disp (getAtoms dispvar) 
    current <- getCurrentDesktop disp (getAtoms dispvar) 
    names <- getDesktopNames disp (getAtoms dispvar)
    activeWindow <- getActiveWindow disp (getAtoms dispvar) 
    sendMessage phi $ WindowListUpdate windows states
    sendMessage phi $ DesktopCountUpdate desktopCount
    sendMessage phi $ CurrentDesktopUpdate current
    sendMessage phi $ DesktopNamesUpdate names
    sendMessage phi $ ActiveWindowUpdate activeWindow
    return (windows, states)
  sendMessage phi Repaint
  
  flip evalStateT (windows, states) $ forever $ do
    m <- receiveMessage phi
    case (fromMessage m) of
      Just (XEvent event) ->
        handleEvent phi dispvar event
      _ ->
        return ()


handleEvent :: Phi -> Display -> SomeEvent -> StateT ([WINDOW], M.Map WINDOW WindowState) IO ()
handleEvent phi dispvar event =
  case (fromEvent event) of
    Just e -> handlePropertyNotifyEvent phi dispvar e
    Nothing -> case (fromEvent event) of
      Just e -> handleConfigureNotifyEvent phi dispvar e
      Nothing -> return ()

handlePropertyNotifyEvent :: Phi -> Display -> PropertyNotifyEvent -> StateT ([WINDOW], M.Map WINDOW WindowState) IO ()
handlePropertyNotifyEvent phi dispvar MkPropertyNotifyEvent {atom_PropertyNotifyEvent = atom, window_PropertyNotifyEvent = window} = do
  let atoms = getAtoms dispvar
  
  when (elem atom $ map ($ atoms) [ atom_NET_ACTIVE_WINDOW
                                  , atom_NET_NUMBER_OF_DESKTOPS
                                  , atom_NET_CURRENT_DESKTOP
                                  , atom_NET_DESKTOP_NAMES
                                  , atom_NET_CLIENT_LIST
                                  , atom_NET_WM_ICON
                                  , atomWM_NAME
                                  , atom_NET_WM_NAME
                                  , atom_NET_WM_DESKTOP
                                  , atom_NET_WM_STATE
                                  ]) $ withDisplay dispvar $ \conn -> do
    let rootwin = getRoot conn
    if (window == rootwin)
      then do
      when (atom == atom_NET_ACTIVE_WINDOW atoms) $ do
        activeWindow <- liftIO $ getActiveWindow conn atoms
        sendMessage phi $ ActiveWindowUpdate activeWindow
        sendMessage phi Repaint
      when (atom == atom_NET_NUMBER_OF_DESKTOPS atoms) $ do
        desktopCount <- liftIO $ getDesktopCount conn atoms
        sendMessage phi $ DesktopCountUpdate desktopCount
        sendMessage phi Repaint
      when (atom == atom_NET_CURRENT_DESKTOP atoms) $ do
        current <- liftIO $ getCurrentDesktop conn atoms
        sendMessage phi $ CurrentDesktopUpdate current
        sendMessage phi Repaint
      when (atom == atom_NET_DESKTOP_NAMES atoms) $ do
        names <- liftIO $ getDesktopNames conn atoms
        sendMessage phi $ DesktopNamesUpdate names
        sendMessage phi Repaint
      when (atom == atom_NET_CLIENT_LIST atoms) $ do
        (windows, windowStates) <- get
        (windows', windowStates') <- liftIO $ getWindowStates conn atoms windowStates
        
        when (windows /= windows') $ do
          sendMessage phi $ WindowListUpdate windows' windowStates'
          sendMessage phi Repaint
          put (windows', windowStates')
    
      else do
      (windows, windowStates) <- get
      when (elem window windows) $ do
        case () of
          _ | (atom == atom_NET_WM_ICON atoms) -> do
            icons <- liftIO $ getWindowIcons conn atoms window
            let windowStates' = M.update (\state -> Just state {windowIcons = icons}) window windowStates
            sendMessage phi $ WindowListUpdate windows windowStates'
            sendMessage phi Repaint
            put (windows, windowStates')
        
            | otherwise -> do
            (name, desktop, visible) <- liftIO $ getWindowInfo conn atoms window
            let mwindowState = M.lookup window windowStates
            case mwindowState of
              Just windowState -> do
                let windowState' = windowState {windowTitle = name, windowDesktop = desktop, windowVisible = visible}
            
                when (windowState /= windowState') $ do
                  let windowStates' = M.insert window windowState' windowStates
                  sendMessage phi $ WindowListUpdate windows windowStates'
                  sendMessage phi Repaint
                  put (windows, windowStates')
              Nothing ->
                return ()


handleConfigureNotifyEvent :: Phi -> Display -> ConfigureNotifyEvent -> StateT ([WINDOW], M.Map WINDOW WindowState) IO ()
handleConfigureNotifyEvent phi dispvar MkConfigureNotifyEvent {window_ConfigureNotifyEvent = window} = do
  (windows, windowStates) <- get
  when (elem window windows) $ withDisplay dispvar $ \conn -> do
    let geom = fmap windowGeometry . M.lookup window $ windowStates
    geom' <- liftIO $ getWindowGeometry conn window
    when (geom /= (Just geom')) $ do
      let windowStates' = M.update (\state -> Just state {windowGeometry = geom'}) window windowStates
      sendMessage phi $ WindowListUpdate windows windowStates'
      sendMessage phi Repaint
      put (windows, windowStates')


getDesktopCount :: Connection -> Atoms -> IO Int
getDesktopCount conn atoms =
  liftM (fromIntegral . fromMaybe 0 . join . fmap listToMaybe) $ getProperty32 conn (getRoot conn) (atom_NET_NUMBER_OF_DESKTOPS atoms)

getCurrentDesktop :: Connection -> Atoms -> IO Int
getCurrentDesktop conn atoms =
  liftM (fromIntegral . fromMaybe (-1) . join . fmap listToMaybe) $ getProperty32 conn (getRoot conn) (atom_NET_CURRENT_DESKTOP atoms)

getDesktopNames :: Connection -> Atoms -> IO [String]
getDesktopNames conn atoms =
  liftM (map (decode . map fromIntegral) . break' . fromMaybe []) $ getProperty8 conn (getRoot conn) (atom_NET_DESKTOP_NAMES atoms)
  where
    break' l = case dropWhile (== 0) l of
      [] -> []
      l' -> w : break' l''
        where (w, l'') = break (== 0) l'

getActiveWindow :: Connection -> Atoms -> IO WINDOW
getActiveWindow conn atoms =
  liftM (fromXid . toXid . fromMaybe 0 . join . fmap listToMaybe) $ getProperty32 conn (getRoot conn) (atom_NET_ACTIVE_WINDOW atoms)

getWindowStates :: Connection -> Atoms -> M.Map WINDOW WindowState -> IO ([WINDOW], M.Map WINDOW WindowState)
getWindowStates conn atoms windowStates = do
  windows <- getWindowList conn atoms
  
  let windowStates' = map (\w -> (w, M.lookup w windowStates)) windows
  
  newWindowStates <- mapM getWindowState' windowStates'
  
  return (windows, M.fromList newWindowStates)
    where
      getWindowState' (window, Just windowState) = return (window, windowState) 
      getWindowState' (window, Nothing) = do
        changeWindowAttributes conn window $ toValueParam [(CWEventMask, toMask [EventMaskPropertyChange, EventMaskStructureNotify])]
        windowState <- getWindowState conn atoms window
        return (window, windowState)

getWindowState :: Connection -> Atoms -> WINDOW -> IO WindowState
getWindowState conn atoms window = do
  (name, workspace, visible) <- getWindowInfo conn atoms window
  icons <- getWindowIcons conn atoms window
  geom <- getWindowGeometry conn window
  
  return $ WindowState { windowTitle = name 
                       , windowDesktop = workspace 
                       , windowVisible = visible 
                       , windowIcons = icons
                       , windowGeometry = geom
                       }

getWindowInfo :: Connection -> Atoms -> WINDOW -> IO (String, Int, Bool)
getWindowInfo conn atoms window = do
  netwmname <- liftM (fmap (decode . map fromIntegral)) $ getProperty8 conn window (atom_NET_WM_NAME atoms)
  wmname <- case netwmname of
    Just name -> return name
    Nothing -> liftM (map unsignedChr . fromMaybe []) $ getProperty8 conn window (atom_NET_WM_NAME atoms)
  
  workspace <- liftM (fromIntegral . fromMaybe 0xFFFFFFFF . join . fmap listToMaybe) $ getProperty32 conn window (atom_NET_WM_DESKTOP atoms)
  visible <- showWindow conn atoms window
  
  return (wmname, workspace, visible)
    where
      unsignedChr = chr . fromIntegral

getWindowIcons :: Connection -> Atoms -> WINDOW -> IO [Icon]
getWindowIcons conn atoms window = getProperty32 conn window (atom_NET_WM_ICON atoms) >>= readIcons . fromMaybe []


readIcons :: [Word32] -> IO [Icon]
readIcons (width:height:iconData) = do
  if ((fromIntegral $ length iconData) < (width*height)) then return [] else do
    let (thisIcon, rest) = splitAt (fromIntegral (width*height)) iconData
    surface <- createImageSurface FormatARGB32 (fromIntegral width) (fromIntegral height)
    surfaceData <- imageSurfaceGetPixels surface :: IO (SurfaceData Int Word32)
    forM_ (zip thisIcon [0..]) $ \(e, i) -> writeArray surfaceData i $ premultiply $ fromIntegral e
    
    surfaceMarkDirty surface
    
    liftM2 (:) (createIcon (fromIntegral $ max width height) surface) (readIcons rest)

readIcons _ = return []

premultiply :: Word32 -> Word32
premultiply c = a .|. r .|. g .|. b
  where
    amask = 0xFF000000
    rmask = 0x00FF0000
    gmask = 0x0000FF00
    bmask = 0x000000FF
    
    a = c .&. amask
    pm mask = (((c .&. mask) * (a `shiftR` 24)) `div` 0xFF) .&. mask
    
    r = pm rmask
    g = pm gmask
    b = pm bmask


getWindowGeometry :: Connection -> WINDOW -> IO RECTANGLE
getWindowGeometry conn window =
  getGeometry conn (fromXid . toXid $ window) >>= getReply >>= return . ((const $ MkRECTANGLE 0 0 0 0) ||| (\(MkGetGeometryReply _ _ x y width height _) -> MkRECTANGLE x y width height))

showWindow :: Connection -> Atoms -> WINDOW -> IO Bool
showWindow conn atoms window = do
  states <- liftM (map (fromXid . toXid) . fromMaybe []) $ getProperty32 conn window (atom_NET_WM_STATE atoms)
  transientFor <- liftM (map fromIntegral . fromMaybe []) $ getProperty32 conn window (atomWM_TRANSIENT_FOR atoms)
  windowType <- liftM (fromMaybe (atom_NET_WM_WINDOW_TYPE_NORMAL atoms) . fmap (fromXid . toXid) . join . fmap listToMaybe) $
                getProperty32 conn window (atom_NET_WM_STATE atoms)
  
  return $ not $ or [ elem (atom_NET_WM_STATE_SKIP_TASKBAR atoms) states 
                    , transientFor /= [] && transientFor /= [0]
                    , elem windowType $ map ($ atoms) [ atom_NET_WM_WINDOW_TYPE_DOCK 
                                                      , atom_NET_WM_WINDOW_TYPE_DESKTOP 
                                                      , atom_NET_WM_WINDOW_TYPE_TOOLBAR 
                                                      , atom_NET_WM_WINDOW_TYPE_MENU 
                                                      , atom_NET_WM_WINDOW_TYPE_SPLASH
                                                      ]
                    ]


getWindowList :: Connection -> Atoms -> IO [WINDOW]
getWindowList conn atoms = liftM (map (fromXid . toXid) . join . maybeToList) $ getProperty32 conn (getRoot conn) (atom_NET_CLIENT_LIST atoms)

taskbar :: TaskbarConfig -> Taskbar
taskbar = Taskbar