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|
-----------------------------------------------------------------------------
-- |
-- Module : Main.hs
-- Copyright : (c) Spencer Janssen 2007
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : sjanssen@cse.unl.edu
-- Stability : unstable
-- Portability : not portable, uses cunning newtype deriving
--
-----------------------------------------------------------------------------
--
-- thunk, a minimal window manager for X11
--
import qualified Data.Map as Map
import Data.Map (Map)
import Data.Sequence as Seq
import qualified Data.Foldable as Fold
import Data.Bits
import Control.Monad.State
import System.IO
import Graphics.X11.Xlib
import Graphics.X11.Xlib.Extras
import System.Process (runCommand)
import System.Exit
import Wm
handler :: Event -> Wm ()
handler (MapRequestEvent {window = w}) = manage w
handler (DestroyWindowEvent {window = w}) = do
modifyWindows (Seq.fromList . filter (/= w) . Fold.toList)
refresh
handler (KeyEvent {event_type = t, state = mod, keycode = code})
| t == keyPress = do
dpy <- getDisplay
sym <- io $ keycodeToKeysym dpy code 0
case filter (\(mod', sym', _) -> mod == mod' && sym == sym') keys of
[] -> return ()
((_, _, act):_) -> act
handler _ = return ()
switch :: Wm ()
switch = do
ws' <- getWindows
case viewl ws' of
EmptyL -> return ()
(w :< ws) -> do
setWindows (ws |> w)
refresh
spawn :: String -> Wm ()
spawn c = do
io $ runCommand c
return ()
keys :: [(KeyMask, KeySym, Wm ())]
keys =
[ (mod1Mask .|. shiftMask, xK_Return, spawn "xterm")
, (controlMask, xK_space, spawn "gmrun")
, (mod1Mask, xK_Tab, switch)
, (mod1Mask .|. shiftMask, xK_q, io $ exitWith ExitSuccess)
]
grabkeys = do
dpy <- getDisplay
root <- io $ rootWindow dpy (defaultScreen dpy)
forM_ keys $ \(mod, sym, _) -> do
code <- io $ keysymToKeycode dpy sym
io $ grabKey dpy code mod root True grabModeAsync grabModeAsync
manage :: Window -> Wm ()
manage w = do
trace "manage"
d <- getDisplay
ws <- getWindows
when (Fold.notElem w ws) $ do
trace "modifying"
modifyWindows (w <|)
io $ mapWindow d w
refresh
refresh :: Wm ()
refresh = do
v <- getWindows
case viewl v of
EmptyL -> return ()
(w :< _) -> do
d <- getDisplay
sw <- getScreenWidth
sh <- getScreenHeight
io $ moveResizeWindow d w 0 0 (fromIntegral sw) (fromIntegral sh)
io $ raiseWindow d w
main = do
dpy <- openDisplay ""
runWm main' (WmState
{ display = dpy
, screenWidth = displayWidth dpy (defaultScreen dpy)
, screenHeight = displayHeight dpy (defaultScreen dpy)
, windows = Seq.empty
})
return ()
main' = do
dpy <- getDisplay
let screen = defaultScreen dpy
io $ do root <- rootWindow dpy screen
selectInput dpy root (substructureRedirectMask .|. substructureNotifyMask)
sync dpy False
grabkeys
loop
loop :: Wm ()
loop = do
dpy <- getDisplay
e <- io $ allocaXEvent $ \ev -> do
nextEvent dpy ev
getEvent ev
handler e
loop
|
