aboutsummaryrefslogtreecommitdiffstats
path: root/XMonad/Layout/Decoration.hs
blob: 72051fe0e29b0a43937eeefe3dc65505ac227fb3 (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
273
274
275
276
277
278
279
280
281
282
{-# OPTIONS_GHC -fglasgow-exts #-} -- for deriving Typeable
{-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses, PatternGuards, TypeSynonymInstances #-}

-----------------------------------------------------------------------------
-- |
-- Module      :  XMonad.Layout.Decoration
-- Copyright   :  (c) 2007 Andrea Rossato
-- License     :  BSD-style (see xmonad/LICENSE)
--
-- Maintainer  :  andrea.rossato@unibz.it
-- Stability   :  unstable
-- Portability :  unportable
--
-- A layout modifier and a class for easily creating decorated
-- layouts.
-----------------------------------------------------------------------------

module XMonad.Layout.Decoration
    ( -- * Usage:
      -- $usage
      decoration
    , Decoration
    , DecorationStyle (..)
    , DecorationMsg (..)
    , Theme (..), defaultTheme
    , shrinkText, CustomShrink ( CustomShrink )
    , Shrinker (..), DefaultShrinker
    , module XMonad.Layout.LayoutModifier
    , isDecoration, fi, lookFor
    ) where

import Data.Maybe
import Data.List

import XMonad
import qualified XMonad.StackSet as W
import XMonad.Hooks.UrgencyHook
import XMonad.Layout.LayoutModifier
import XMonad.Layout.WindowArranger (WindowArrangerMsg (..), diff, listFromList)
import XMonad.Util.NamedWindows (getName)
import XMonad.Util.Invisible
import XMonad.Util.XUtils
import XMonad.Util.Font

-- $usage
-- For usage examples you can see "XMonad.Layout.SimpleDecoration",
-- "XMonad.Layout.Tabbed", "XMonad.Layout.DwmStyle",

decoration :: (DecorationStyle ds a, Shrinker s) => s -> Theme -> ds a
           -> l a -> ModifiedLayout (Decoration ds s) l a
decoration s t ds = ModifiedLayout (Decoration (I Nothing) s t ds)

data Theme =
    Theme { activeColor         :: String
          , inactiveColor       :: String
          , urgentColor         :: String
          , activeBorderColor   :: String
          , inactiveBorderColor :: String
          , urgentBorderColor   :: String
          , activeTextColor     :: String
          , inactiveTextColor   :: String
          , urgentTextColor     :: String
          , fontName            :: String
          , decoWidth           :: Dimension
          , decoHeight          :: Dimension
          } deriving (Show, Read)

defaultTheme :: Theme
defaultTheme =
    Theme { activeColor         = "#999999"
          , inactiveColor       = "#666666"
          , urgentColor         = "#FFFF00"
          , activeBorderColor   = "#FFFFFF"
          , inactiveBorderColor = "#BBBBBB"
          , urgentBorderColor   = "##00FF00"
          , activeTextColor     = "#FFFFFF"
          , inactiveTextColor   = "#BFBFBF"
          , urgentTextColor     = "#FF0000"
          , fontName            = "-misc-fixed-*-*-*-*-10-*-*-*-*-*-*-*"
          , decoWidth           = 200
          , decoHeight          = 20
          }

data DecorationMsg = SetTheme Theme deriving ( Typeable )
instance Message DecorationMsg

type DecoWin = (Window,Maybe Rectangle)
type OrigWin = (Window,Rectangle)
data DecorationState =
    DS { decos :: [(OrigWin,DecoWin)]
       , font  :: XMonadFont
       }

data Decoration ds s a =
    Decoration (Invisible Maybe DecorationState) s Theme (ds a)
    deriving (Show, Read)

class (Read (ds a), Show (ds a)) => DecorationStyle ds a where
    describeDeco :: ds a -> String
    describeDeco ds = show ds

    decorateFirst :: ds a -> Bool
    decorateFirst _ = True

    shrink :: ds a -> Rectangle -> Rectangle -> Rectangle
    shrink _ (Rectangle _ _ _ dh) (Rectangle x y w h) = Rectangle x (y + fi dh) w (h - dh)

    decoEventHook :: ds a -> DecorationState -> Event -> X ()
    decoEventHook _ (DS dwrs@(((_,r),(dw,_)):_) _) ButtonEvent { ev_window     = ew
                                                               , ev_event_type = et
                                                               , ev_x_root     = ex
                                                               , ev_y_root     = ey }
        | et == buttonPress
        , ew == dw = mouseDrag (\x y -> do
                                  let rect = Rectangle (x - (fi ex - rect_x r))
                                                       (y - (fi ey - rect_y r))
                                                       (rect_width  r)
                                                       (rect_height r)
                                  sendMessage (SetGeometry rect)) (return ())
        | et == buttonPress
        , Just ((mainw,_),_) <- lookFor ew dwrs = focus mainw
    decoEventHook _ _ _ = return ()

    pureDecoration :: ds a -> Dimension -> Dimension -> Rectangle
                   -> W.Stack a -> [(a,Rectangle)] -> (a,Rectangle) -> Maybe Rectangle
    pureDecoration _ _ h _ _ _ (_,Rectangle x y w _) = Just $ Rectangle x y w h

    decorate :: ds a -> Dimension -> Dimension -> Rectangle
             -> W.Stack a -> [(a,Rectangle)] -> (a,Rectangle) -> X (Maybe Rectangle)
    decorate ds w h r s ars ar = return $ pureDecoration ds w h r s ars ar

instance (DecorationStyle ds Window, Shrinker s) => LayoutModifier (Decoration ds s) Window where
    redoLayout (Decoration st sh t ds) sc stack wrs
        | decorate_first   = do whenIJust st releaseResources
                                return (wrs, Just $ Decoration (I Nothing) sh t ds)
        | I Nothing  <- st = initState t wrs >>= processState
        | I (Just s) <- st = do let dwrs  = decos s
                                    (d,a) = curry diff (get_ws dwrs) ws
                                    toDel = todel d dwrs
                                    toAdd = toadd a wrs
                                deleteWindows (getDWs toDel)
                                ndwrs <- createDecos t toAdd
                                processState (s {decos = ndwrs ++ del_dwrs d dwrs })
        | otherwise        = return (wrs, Nothing)

        where
          ws        = map fst wrs
          del_dwrs  = listFromList get_w notElem
          get_w     = fst . fst
          get_ws    = map get_w
          find_dw i = fst . snd . flip (!!) i
          todel   d = filter (flip elem d . get_w)
          toadd   a = filter (flip elem a . fst  )

          -- We drop any windows that are *precisely* stacked underneath
          -- another window: these must be intended to be tabbed!
          insert_dwr otherRs (((w,r),(dw,Just dr)):zzz)
              | r `elem` otherRs = (dw,dr):insert_dwr otherRs zzz
              | otherwise = (dw,dr):(w, shrink ds dr r):insert_dwr (r:otherRs)  zzz
          insert_dwr otherRs (((w,r),(_ ,Nothing)):zzz) = (w,r):insert_dwr (r:otherRs) zzz
          insert_dwr _ [] = []

          resync _         [] = return []
          resync d ((w,r):xs) = case  w `elemIndex` get_ws d of
                                  Just i  -> do dr   <- decorate ds (decoWidth t) (decoHeight t) sc stack wrs (w,r)
                                                dwrs <- resync d xs
                                                return $ ((w,r),(find_dw i d, dr)) : dwrs
                                  Nothing -> resync d xs

          decorate_first = length wrs == 1 && (not . decorateFirst $ ds)
          processState s = do ndwrs <- resync (decos s) wrs
                              showWindows (getDWs ndwrs)
                              updateDecos sh t (font s) ndwrs
                              return (insert_dwr [] ndwrs, Just (Decoration (I (Just (s {decos = ndwrs}))) sh t ds))

    handleMess (Decoration (I (Just s@(DS {decos = dwrs}))) sh t ds) m
        | Just e <- fromMessage m :: Maybe Event = do decoEventHook ds s e
                                                      handleEvent sh t s e
                                                      return Nothing
        | Just Hide             <- fromMessage m = do hideWindows (getDWs dwrs)
                                                      return Nothing
        | Just (SetTheme nt)    <- fromMessage m = do releaseResources s
                                                      return $ Just $ Decoration (I Nothing) sh nt ds
        | Just ReleaseResources <- fromMessage m = do releaseResources s
                                                      return $ Just $ Decoration (I Nothing) sh t  ds
    handleMess _ _ = return Nothing

    emptyLayoutMod (Decoration (I (Just (DS dwrs f))) sh t ds) _ _ = do
        deleteWindows (getDWs dwrs)
        releaseXMF f
        return ([], Just $ Decoration (I Nothing) sh t ds)
    emptyLayoutMod _ _ _  = return ([], Nothing)

    modifierDescription (Decoration _ _ _ ds) = describeDeco ds

handleEvent :: Shrinker s => s -> Theme -> DecorationState -> Event -> X ()
handleEvent sh t (DS dwrs fs) e
    | PropertyEvent {ev_window = w} <- e, w `elem` (map (fst . fst) dwrs) = updateDecos sh t fs dwrs
    | ExposeEvent   {ev_window = w} <- e, w `elem` (map (fst . snd) dwrs) = updateDecos sh t fs dwrs
handleEvent _ _ _ _ = return ()

lookFor :: Window -> [(OrigWin,DecoWin)] -> Maybe (OrigWin,DecoWin)
lookFor w ((x,(w',y)):zs) | w == w' = Just (x,(w',y))
                          | otherwise = lookFor w zs
lookFor _ [] = Nothing

getDWs :: [(OrigWin,DecoWin)] -> [Window]
getDWs = map (fst . snd)

initState ::  Theme -> [(Window,Rectangle)] -> X DecorationState
initState t wrs = do
  fs   <- initXMF (fontName t)
  dwrs <- createDecos t wrs
  return $ DS dwrs fs

releaseResources :: DecorationState -> X ()
releaseResources s = do
  deleteWindows (getDWs $ decos s)
  releaseXMF    (font s)

createDecos :: Theme -> [(Window,Rectangle)] -> X [(OrigWin,DecoWin)]
createDecos _ [] = return []
createDecos t (wr:wrs) = do
  let rect = Rectangle 0 0 1 1
      mask = Just (exposureMask .|. buttonPressMask)
  dw   <- createNewWindow rect mask (inactiveColor t) True
  dwrs <- createDecos t wrs
  return ((wr,(dw,Nothing)):dwrs)

updateDecos :: Shrinker s => s -> Theme -> XMonadFont -> [(OrigWin, DecoWin)] -> X ()
updateDecos s t f = mapM_ $ updateDeco s t f

updateDeco :: Shrinker s => s -> Theme -> XMonadFont -> (OrigWin, DecoWin) -> X ()
updateDeco sh t fs ((w,_),(dw,Just (Rectangle _ _ wh ht))) = do
  nw  <- getName w
  ur  <- readUrgents
  dpy <- asks display
  let focusColor win ic ac uc = (maybe ic (\focusw -> case () of
                                                       _ | focusw == win -> ac
                                                         | win `elem` ur -> uc
                                                         | otherwise     -> ic) . W.peek)
                                `fmap` gets windowset
  (bc,borderc,tc) <- focusColor w
                     (inactiveColor t, inactiveBorderColor t, inactiveTextColor t)
                     (activeColor   t, activeBorderColor   t, activeTextColor   t)
                     (urgentColor   t, urgentBorderColor   t, urgentTextColor   t)
  let s  = shrinkIt sh
  name <- shrinkWhile s (\n -> do
                                size <- io $ textWidthXMF dpy fs n
                                return $ size > fromIntegral wh - fromIntegral (ht `div` 2)) (show nw)
  paintAndWrite dw fs wh ht 1 bc borderc tc bc AlignCenter name
updateDeco _ _ _ (_,(w,Nothing)) = hideWindow w

isDecoration :: Window -> X Bool
isDecoration w = withDisplay (io . flip getWindowAttributes w) >>= return . wa_override_redirect

shrinkWhile :: (String -> [String]) -> (String -> X Bool) -> String -> X String
shrinkWhile sh p x = sw $ sh x
    where sw [n] = return n
          sw [] = return ""
          sw (n:ns) = do
                        cond <- p n
                        if cond
                          then sw ns
                          else return n

data CustomShrink = CustomShrink
instance Show CustomShrink where show _ = ""
instance Read CustomShrink where readsPrec _ s = [(CustomShrink,s)]

class (Read s, Show s) => Shrinker s where
    shrinkIt :: s -> String -> [String]

data DefaultShrinker = DefaultShrinker
instance Show DefaultShrinker where show _ = ""
instance Read DefaultShrinker where readsPrec _ s = [(DefaultShrinker,s)]
instance Shrinker DefaultShrinker where
    shrinkIt _ "" = [""]
    shrinkIt s cs = cs : shrinkIt s (init cs)

shrinkText :: DefaultShrinker
shrinkText = DefaultShrinker