diff options
Diffstat (limited to 'MetaTile/Main.hsc')
| -rw-r--r-- | MetaTile/Main.hsc | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/MetaTile/Main.hsc b/MetaTile/Main.hsc new file mode 100644 index 0000000..abdb75c --- /dev/null +++ b/MetaTile/Main.hsc @@ -0,0 +1,433 @@ +{-# LANGUAGE MultiParamTypeClasses, FlexibleContexts, ForeignFunctionInterface #-} +---------------------------------------------------------------------------- +-- | +-- Module : MetaTile.Main +-- Copyright : (c) Spencer Janssen 2007 +-- License : BSD3-style (see LICENSE) +-- +-- Maintainer : spencerjanssen@gmail.com +-- Stability : unstable +-- Portability : not portable, uses mtl, X11, posix +-- +-- metatile, a minimalist, tiling window manager for X11 +-- +----------------------------------------------------------------------------- + +module MetaTile.Main (metatile) where + +import Control.Arrow (second) +import Data.Bits +import Data.List ((\\)) +import Data.Function +import qualified Data.Map as M +import Control.Monad.Reader +import Control.Monad.State +import Data.Maybe (fromMaybe) +import Data.Monoid (getAll) + +import Foreign.C +import Foreign.Ptr + +import System.Environment (getArgs) + +import Graphics.X11.Xlib hiding (refreshKeyboardMapping) +import Graphics.X11.Xlib.Extras +import Graphics.X11.Xlib.Types (Visual(..)) + +import MetaTile.Core +import qualified MetaTile.Config as Default +import MetaTile.StackSet (new, member) +import qualified MetaTile.StackSet as W +import MetaTile.Operations + +import System.IO + +------------------------------------------------------------------------ +-- Locale support + +#include <locale.h> + +foreign import ccall unsafe "locale.h setlocale" + c_setlocale :: CInt -> Ptr CChar -> IO (Ptr CChar) + +------------------------------------------------------------------------ + +-- | +-- The main entry point +-- +metatile :: (LayoutClass l Window, Read (l Window)) => XConfig l -> IO () +metatile initxmc = do + -- setup locale information from environment + withCString "" $ c_setlocale (#const LC_ALL) + -- ignore SIGPIPE and SIGCHLD + installSignalHandlers + -- First, wrap the layout in an existential, to keep things pretty: + let xmc = initxmc { layoutHook = Layout $ layoutHook initxmc } + dpy <- openDisplay "" + let dflt = defaultScreen dpy + + rootw <- rootWindow dpy dflt + + args <- getArgs + + when ("--replace" `elem` args) $ replace dpy dflt rootw + + -- If another WM is running, a BadAccess error will be returned. The + -- default error handler will write the exception to stderr and exit with + -- an error. + selectInput dpy rootw $ rootMask initxmc + + sync dpy False -- sync to ensure all outstanding errors are delivered + + -- turn off the default handler in favor of one that ignores all errors + -- (ugly, I know) + xSetErrorHandler -- in C, I'm too lazy to write the binding: dons + + xinesc <- getCleanedScreenInfo dpy + nbc <- do v <- initColor dpy $ normalBorderColor xmc + ~(Just nbc_) <- initColor dpy $ normalBorderColor Default.def + return (fromMaybe nbc_ v) + + fbc <- do v <- initColor dpy $ focusedBorderColor xmc + ~(Just fbc_) <- initColor dpy $ focusedBorderColor Default.def + return (fromMaybe fbc_ v) + + hSetBuffering stdout NoBuffering + + let layout = layoutHook xmc + lreads = readsLayout layout + initialWinset = new layout (workspaces xmc) $ map SD xinesc + maybeRead reads' s = case reads' s of + [(x, "")] -> Just x + _ -> Nothing + + winset = fromMaybe initialWinset $ do + ("--resume" : s : _) <- return args + ws <- maybeRead reads s + return $ W.mapLayout (fromMaybe layout . maybeRead lreads) ws + extState = fromMaybe M.empty $ do + ("--resume" : _ : dyns : _) <- return args + vals <- maybeRead reads dyns + return . M.fromList . map (second Left) $ vals + + cf = XConf + { display = dpy + , config = xmc + , theRoot = rootw + , normalBorder = nbc + , focusedBorder = fbc + , keyActions = keys xmc xmc + , buttonActions = mouseBindings xmc xmc + , mouseFocused = False + , mousePosition = Nothing + , currentEvent = Nothing } + + st = XState + { windowset = initialWinset + , numberlockMask = 0 + , windowState = M.empty + , dragging = Nothing + , extensibleState = extState + } + allocaXEvent $ \e -> + runX cf st $ do + + setNumlockMask + grabKeys + grabButtons + + io $ sync dpy False + + ws <- io $ scan dpy rootw + + -- bootstrap the windowset, Operations.windows will identify all + -- the windows in winset as new and set initial properties for + -- those windows. Remove all windows that are no longer top-level + -- children of the root, they may have disappeared since + -- restarting. + windows . const . foldr W.delete winset $ W.allWindows winset \\ ws + + -- manage the as-yet-unmanaged windows + mapM_ (\w -> reparent w >> manage w) (ws \\ W.allWindows winset) + + userCode $ startupHook initxmc + + -- main loop, for all you HOF/recursion fans out there. + forever $ prehandle =<< io (nextEvent dpy e >> getEvent e) + + return () + where + -- if the event gives us the position of the pointer, set mousePosition + prehandle e = let mouse = do guard (ev_event_type e `elem` evs) + return (fromIntegral (ev_x_root e) + ,fromIntegral (ev_y_root e)) + in local (\c -> c { mousePosition = mouse, currentEvent = Just e }) (handleWithHook e) + evs = [ keyPress, keyRelease, enterNotify, leaveNotify + , buttonPress, buttonRelease] + + +-- | Runs handleEventHook from the configuration and runs the default handler +-- function if it returned True. +handleWithHook :: Event -> X () +handleWithHook e = do + evHook <- asks (handleEventHook . config) + whenX (userCodeDef True $ getAll `fmap` evHook e) (handle e) + +-- --------------------------------------------------------------------- +-- | Event handler. Map X events onto calls into Operations.hs, which +-- modify our internal model of the window manager state. +-- +-- Events dwm handles that we don't: +-- +-- [ButtonPress] = buttonpress, +-- [Expose] = expose, +-- [PropertyNotify] = propertynotify, +-- +handle :: Event -> X () + +-- run window manager command +handle (KeyEvent {ev_event_type = t, ev_state = m, ev_keycode = code}) + | t == keyPress = withDisplay $ \dpy -> do + s <- io $ keycodeToKeysym dpy code 0 + mClean <- cleanMask m + ks <- asks keyActions + userCodeDef () $ whenJust (M.lookup (mClean, s) ks) id + +-- manage a new window +handle (MapRequestEvent {ev_window = w}) = withDisplay $ \dpy -> do + wa <- io $ getWindowAttributes dpy w -- ignore override windows + -- need to ignore mapping requests by managed windows not on the current workspace + managed <- isClient w + when (not (wa_override_redirect wa) && not managed) $ do + reparent w + manage w + +-- window destroyed, unmanage it +-- window gone, unmanage it +handle (DestroyWindowEvent {ev_window = w}) = do + whenX (isClient w) $ + unmanage w + unparent w + modify (\s -> s { windowState = M.delete w (windowState s)}) + +-- We track expected unmap events in waitingUnmap. We ignore this event unless +-- it is synthetic or we are not expecting an unmap notification from a window. +handle UnmapEvent {ev_window = w, ev_send_event = synthetic, ev_event = we} = whenX (isClient w) $ do + rootw <- asks theRoot + e <- getsWindowState wsWaitingUnmap w + if (synthetic || (e == 0 && we /= rootw)) + then unmanage w >> hideParent w + else when (e > 0) $ modifyWindowState (\ws -> ws { wsWaitingUnmap = e - 1 }) w + +-- set keyboard mapping +handle e@(MappingNotifyEvent {}) = do + io $ refreshKeyboardMapping e + when (ev_request e `elem` [mappingKeyboard, mappingModifier]) $ do + setNumlockMask + grabKeys + +-- handle button release, which may finish dragging. +handle e@(ButtonEvent {ev_event_type = t}) + | t == buttonRelease = do + drag <- gets dragging + case drag of + -- we're done dragging and have released the mouse: + Just (_,f) -> modify (\s -> s { dragging = Nothing }) >> f + Nothing -> broadcastMessage e + +-- handle motionNotify event, which may mean we are dragging. +handle e@(MotionEvent {ev_event_type = _t, ev_x = x, ev_y = y}) = do + drag <- gets dragging + case drag of + Just (d,_) -> d (fromIntegral x) (fromIntegral y) -- we're dragging + Nothing -> broadcastMessage e + +-- click on an unfocused window, makes it focused on this workspace +handle e@(ButtonEvent {ev_window = w,ev_event_type = t,ev_button = b }) + | t == buttonPress = do + -- If it's the root window, then it's something we + -- grabbed in grabButtons. Otherwise, it's click-to-focus. + dpy <- asks display + isr <- isRoot w + m <- cleanMask $ ev_state e + mact <- asks (M.lookup (m, b) . buttonActions) + case mact of + Just act | isr -> act $ ev_subwindow e + _ -> do + focus w + ctf <- asks (clickJustFocuses . config) + unless ctf $ io (allowEvents dpy replayPointer currentTime) + broadcastMessage e -- Always send button events. + +-- entered a normal window: focus it if focusFollowsMouse is set to +-- True in the user's config. +handle e@(CrossingEvent {ev_window = w, ev_event_type = t}) + | t == enterNotify && ev_mode e == notifyNormal + = whenX (asks $ focusFollowsMouse . config) (focus w) + +-- left a window, check if we need to focus root +handle e@(CrossingEvent {ev_event_type = t}) + | t == leaveNotify + = do rootw <- asks theRoot + when (ev_window e == rootw && not (ev_same_screen e)) $ setFocusX rootw + +-- configure a window +handle e@(ConfigureRequestEvent {ev_window = w}) = withDisplay $ \dpy -> do + ws <- gets windowset + + if not (member w ws) + then do io $ configureWindow dpy w (ev_value_mask e) $ WindowChanges + { wc_x = ev_x e + , wc_y = ev_y e + , wc_width = ev_width e + , wc_height = ev_height e + , wc_border_width = 0 + , wc_sibling = ev_above e + , wc_stack_mode = ev_detail e } + else configureClientWindow w + io $ sync dpy False + +-- configuration changes in the root may mean display settings have changed +handle (ConfigureEvent {ev_window = w}) = whenX (isRoot w) rescreen + +-- property notify +handle event@(PropertyEvent { ev_event_type = t, ev_atom = a }) + | t == propertyNotify && a == wM_NAME = asks (logHook . config) >>= userCodeDef () >> + broadcastMessage event + +handle e@ClientMessageEvent { ev_message_type = mt } = do + a <- getAtom "XMONAD_RESTART" + if (mt == a) + then restart "metatile" True + else broadcastMessage e + +handle e = broadcastMessage e -- trace (eventName e) -- ignoring + + +reparent :: Window -> X () +reparent w = withDisplay $ \dpy -> do + rootw <- asks theRoot + p <- asks normalBorder + fMask <- asks (frameMask . config) + noFrame <- getsWindowState ((==none) . wsFrame) w + when noFrame $ do + trace $ "reparent: " ++ show w + frame <- io $ allocaSetWindowAttributes $ \swa -> do + set_background_pixel swa p + set_border_pixel swa p + set_event_mask swa fMask + set_override_redirect swa True + createWindow dpy rootw (-1) (-1) 1 1 0 copyFromParent inputOutput (Visual nullPtr) (cWBackPixel.|.cWBorderPixel.|.cWEventMask.|.cWOverrideRedirect) swa + io $ do + unmapWindow dpy w + addToSaveSet dpy w + reparentWindow dpy w frame 0 0 + modifyWindowState (\ws -> ws { wsFrame = frame }) w + +hideParent :: Window -> X () +hideParent w = withDisplay $ \dpy -> do + frame <- getsWindowState wsFrame w + when (frame /= none) $ io $ unmapWindow dpy frame + +unparent :: Window -> X () +unparent w = withDisplay $ \dpy -> do + frame <- getsWindowState wsFrame w + when (frame /= none) $ do + trace $ "unparent: " ++ show w + io $ destroyWindow dpy frame + modifyWindowState (\ws -> ws { wsFrame = none }) w + +-- --------------------------------------------------------------------- +-- IO stuff. Doesn't require any X state +-- Most of these things run only on startup (bar grabkeys) + +-- | scan for any new windows to manage. If they're already managed, +-- this should be idempotent. +scan :: Display -> Window -> IO [Window] +scan dpy rootw = do + (_, _, ws) <- queryTree dpy rootw + filterM ok ws + -- TODO: scan for windows that are either 'IsViewable' or where WM_STATE == + -- Iconic + where ok w = do wa <- getWindowAttributes dpy w + a <- internAtom dpy "WM_STATE" False + p <- getWindowProperty32 dpy a w + let ic = case p of + Just (3:_) -> True -- 3 for iconified + _ -> False + return $ not (wa_override_redirect wa) + && (wa_map_state wa == waIsViewable || ic) + +setNumlockMask :: X () +setNumlockMask = do + dpy <- asks display + ms <- io $ getModifierMapping dpy + xs <- sequence [ do + ks <- io $ keycodeToKeysym dpy kc 0 + if ks == xK_Num_Lock + then return (setBit 0 (fromIntegral m)) + else return (0 :: KeyMask) + | (m, kcs) <- ms, kc <- kcs, kc /= 0] + modify (\s -> s { numberlockMask = foldr (.|.) 0 xs }) + +-- | Grab the keys back +grabKeys :: X () +grabKeys = do + XConf { display = dpy, theRoot = rootw } <- ask + let grab kc m = io $ grabKey dpy kc m rootw True grabModeAsync grabModeAsync + (minCode, maxCode) = displayKeycodes dpy + allCodes = [fromIntegral minCode .. fromIntegral maxCode] + io $ ungrabKey dpy anyKey anyModifier rootw + ks <- asks keyActions + -- build a map from keysyms to lists of keysyms (doing what + -- XGetKeyboardMapping would do if the X11 package bound it) + syms <- forM allCodes $ \code -> io (keycodeToKeysym dpy code 0) + let keysymMap = M.fromListWith (++) (zip syms [[code] | code <- allCodes]) + keysymToKeycodes sym = M.findWithDefault [] sym keysymMap + forM_ (M.keys ks) $ \(mask,sym) -> + forM_ (keysymToKeycodes sym) $ \kc -> + mapM_ (grab kc . (mask .|.)) =<< extraModifiers + +-- | XXX comment me +grabButtons :: X () +grabButtons = do + XConf { display = dpy, theRoot = rootw } <- ask + let grab button mask = io $ grabButton dpy button mask rootw False buttonPressMask + grabModeAsync grabModeSync none none + io $ ungrabButton dpy anyButton anyModifier rootw + ems <- extraModifiers + ba <- asks buttonActions + mapM_ (\(m,b) -> mapM_ (grab b . (m .|.)) ems) (M.keys $ ba) + +-- | @replace@ to signals compliant window managers to exit. +replace :: Display -> ScreenNumber -> Window -> IO () +replace dpy dflt rootw = do + -- check for other WM + wmSnAtom <- internAtom dpy ("WM_S" ++ show dflt) False + currentWmSnOwner <- xGetSelectionOwner dpy wmSnAtom + when (currentWmSnOwner /= 0) $ do + -- prepare to receive destroyNotify for old WM + selectInput dpy currentWmSnOwner structureNotifyMask + + -- create off-screen window + netWmSnOwner <- allocaSetWindowAttributes $ \attributes -> do + set_override_redirect attributes True + set_event_mask attributes propertyChangeMask + let screen = defaultScreenOfDisplay dpy + visual = defaultVisualOfScreen screen + attrmask = cWOverrideRedirect .|. cWEventMask + createWindow dpy rootw (-100) (-100) 1 1 0 copyFromParent copyFromParent visual attrmask attributes + + -- try to acquire wmSnAtom, this should signal the old WM to terminate + xSetSelectionOwner dpy wmSnAtom netWmSnOwner currentTime + + -- SKIPPED: check if we acquired the selection + -- SKIPPED: send client message indicating that we are now the WM + + -- wait for old WM to go away + fix $ \again -> do + evt <- allocaXEvent $ \event -> do + windowEvent dpy currentWmSnOwner structureNotifyMask event + get_EventType event + + when (evt /= destroyNotify) again |