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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 mtl, X11, posix
--
-----------------------------------------------------------------------------
--
-- thunk, a minimal window manager for X11
--
import Data.Bits hiding (rotate)
import System.IO
import System.Process (runCommand)
import System.Exit
import Graphics.X11.Xlib
import Graphics.X11.Xlib.Extras
import Control.Monad.State
import W
--
-- let's get underway
--
main :: IO ()
main = do
dpy <- openDisplay ""
let dflt = defaultScreen dpy
initState = WState
{ display = dpy
, screenWidth = displayWidth dpy dflt
, screenHeight = displayHeight dpy dflt
, windows = [] }
runW initState $ do
root <- io $ rootWindow dpy dflt
io $ do selectInput dpy root (substructureRedirectMask .|. substructureNotifyMask)
sync dpy False
registerKeys dpy root
go dpy
return ()
where
-- The main loop
go dpy = forever $ do
e <- io $ allocaXEvent $ \ev -> nextEvent dpy ev >> getEvent ev
handle e
--
-- | grabkeys. Register key commands
--
registerKeys :: Display -> Window -> W ()
registerKeys dpy root =
forM_ keys $ \(mod, sym, _) -> do
kc <- io (keysymToKeycode dpy sym)
io $ grabKey dpy kc mod root True grabModeAsync grabModeAsync
keys :: [(KeyMask, KeySym, W ())]
keys =
[ (mod1Mask .|. shiftMask, xK_Return, spawn "xterm")
, (mod1Mask, xK_p, spawn "exe=`dmenu_path | dmenu` && exec $exe")
, (controlMask, xK_space, spawn "gmrun")
, (mod1Mask, xK_Tab, switch)
, (mod1Mask .|. shiftMask, xK_q, io $ exitWith ExitSuccess)
]
--
-- The event handler
--
handle :: Event -> W ()
handle (MapRequestEvent {window = w}) = manage w
handle (DestroyWindowEvent {window = w}) = do
modifyWindows (filter (/= w))
refresh
handle (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
handle _ = return ()
-- ---------------------------------------------------------------------
-- Managing windows
-- | Modify the current window list with a pure funtion, and refresh
withWindows :: (Windows -> Windows) -> W ()
withWindows f = do
modifyWindows f
refresh
-- | Run an action on the currently focused window
withCurrent :: (Window -> W ()) -> W ()
withCurrent f = do
ws <- getWindows
case ws of
[] -> return ()
(w:_) -> f w
--
-- | refresh. Refresh the currently focused window. Resizes to full
-- screen and raises the window.
--
refresh :: W ()
refresh = withCurrent $ \w -> do
d <- getDisplay
sw <- getScreenWidth
sh <- getScreenHeight
io $ do moveResizeWindow d w 0 0 (fromIntegral sw) (fromIntegral sh)
raiseWindow d w
--
-- | manage. Add a new window to be managed
--
manage :: Window -> W ()
manage w = do
trace "manage"
d <- getDisplay
withWindows $ \ws -> if w `elem` ws then ws else w:ws -- a set
io $ mapWindow d w
--
-- | switch. switch focus to next window in list.
-- The currently focused window is always the head of the list
--
switch :: W ()
switch = withWindows rotate
--
-- | spawn. Launch an external application
--
spawn :: String -> W ()
spawn = io_ . runCommand
|
