-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Hooks.EwmhDesktops
-- Copyright : (c) 2007, 2008 Joachim Breitner <mail@joachim-breitner.de>
-- License : BSD
--
-- Maintainer : Joachim Breitner <mail@joachim-breitner.de>
-- Stability : unstable
-- Portability : unportable
--
-- Makes xmonad use the EWMH hints to tell panel applications about its
-- workspaces and the windows therein. It also allows the user to interact
-- with xmonad by clicking on panels and window lists.
-----------------------------------------------------------------------------
module XMonad.Hooks.EwmhDesktops (
-- * Usage
-- $usage
ewmh,
ewmhDesktopsStartup,
ewmhDesktopsLogHook,
ewmhDesktopsLogHookCustom,
ewmhDesktopsEventHook
) where
import Codec.Binary.UTF8.String (encode)
import Data.List
import Data.Maybe
import Data.Monoid
import XMonad
import Control.Monad
import qualified XMonad.StackSet as W
import XMonad.Hooks.SetWMName
import XMonad.Util.WorkspaceCompare
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad
-- > import XMonad.Hooks.EwmhDesktops
-- >
-- > main = xmonad $ ewmh defaultConfig
--
-- You may also be interested in 'avoidStruts' from XMonad.Hooks.ManageDocks.
-- | Add EWMH functionality to the given config. See above for an example.
ewmh :: XConfig a -> XConfig a
ewmh c = c { startupHook = startupHook c +++ ewmhDesktopsStartup
, handleEventHook = handleEventHook c +++ ewmhDesktopsEventHook
, logHook = logHook c +++ ewmhDesktopsLogHook }
where x +++ y = mappend x y
-- |
-- Initializes EwmhDesktops and advertises EWMH support to the X
-- server
ewmhDesktopsStartup :: X ()
ewmhDesktopsStartup = setSupported
-- |
-- Notifies pagers and window lists, such as those in the gnome-panel
-- of the current state of workspaces and windows.
ewmhDesktopsLogHook :: X ()
ewmhDesktopsLogHook = ewmhDesktopsLogHookCustom id
-- |
-- Generalized version of ewmhDesktopsLogHook that allows an arbitrary
-- user-specified function to transform the workspace list (post-sorting)
ewmhDesktopsLogHookCustom :: ([WindowSpace] -> [WindowSpace]) -> X ()
ewmhDesktopsLogHookCustom f = withWindowSet $ \s -> do
sort' <- getSortByIndex
let ws = f $ sort' $ W.workspaces s
-- Number of Workspaces
setNumberOfDesktops (length ws)
-- Names thereof
setDesktopNames (map W.tag ws)
-- all windows, with focused windows last
let wins = nub . concatMap (maybe [] (\(W.Stack x l r)-> reverse l ++ r ++ [x]) . W.stack) $ ws
setClientList wins
-- Current desktop
case (elemIndex (W.currentTag s) $ map W.tag ws) of
Nothing -> return ()
Just curr -> do
setCurrentDesktop curr
-- Per window Desktop
-- To make gnome-panel accept our xinerama stuff, we display
-- all visible windows on the current desktop.
forM_ (W.current s : W.visible s) $ \x ->
forM_ (W.integrate' (W.stack (W.workspace x))) $ \win -> do
setWindowDesktop win curr
forM_ (W.hidden s) $ \w ->
case elemIndex (W.tag w) (map W.tag ws) of
Nothing -> return ()
Just wn -> forM_ (W.integrate' (W.stack w)) $ \win -> do
setWindowDesktop win wn
setActiveWindow
return ()
-- |
-- Intercepts messages from pagers and similar applications and reacts on them.
-- Currently supports:
--
-- * _NET_CURRENT_DESKTOP (switching desktops)
--
-- * _NET_WM_DESKTOP (move windows to other desktops)
--
-- * _NET_ACTIVE_WINDOW (activate another window, changing workspace if needed)
--
ewmhDesktopsEventHook :: Event -> X All
ewmhDesktopsEventHook e = handle e >> return (All True)
handle :: Event -> X ()
handle ClientMessageEvent {
ev_window = w,
ev_message_type = mt,
ev_data = d
} = withWindowSet $ \s -> do
sort' <- getSortByIndex
let ws = sort' $ W.workspaces s
a_cd <- getAtom "_NET_CURRENT_DESKTOP"
a_d <- getAtom "_NET_WM_DESKTOP"
a_aw <- getAtom "_NET_ACTIVE_WINDOW"
a_cw <- getAtom "_NET_CLOSE_WINDOW"
a_ignore <- mapM getAtom ["XMONAD_TIMER"]
if mt == a_cd then do
let n = fromIntegral (head d)
if 0 <= n && n < length ws then
windows $ W.view (W.tag (ws !! n))
else trace $ "Bad _NET_CURRENT_DESKTOP with data[0]="++show n
else if mt == a_d then do
let n = fromIntegral (head d)
if 0 <= n && n < length ws then
windows $ W.shiftWin (W.tag (ws !! n)) w
else trace $ "Bad _NET_DESKTOP with data[0]="++show n
else if mt == a_aw then do
windows $ W.focusWindow w
else if mt == a_cw then do
killWindow w
else if mt `elem` a_ignore then do
return ()
else do
-- The Message is unknown to us, but that is ok, not all are meant
-- to be handled by the window manager
return ()
handle _ = return ()
setNumberOfDesktops :: (Integral a) => a -> X ()
setNumberOfDesktops n = withDisplay $ \dpy -> do
a <- getAtom "_NET_NUMBER_OF_DESKTOPS"
c <- getAtom "CARDINAL"
r <- asks theRoot
io $ changeProperty32 dpy r a c propModeReplace [fromIntegral n]
setCurrentDesktop :: (Integral a) => a -> X ()
setCurrentDesktop i = withDisplay $ \dpy -> do
a <- getAtom "_NET_CURRENT_DESKTOP"
c <- getAtom "CARDINAL"
r <- asks theRoot
io $ changeProperty32 dpy r a c propModeReplace [fromIntegral i]
setDesktopNames :: [String] -> X ()
setDesktopNames names = withDisplay $ \dpy -> do
-- Names thereof
r <- asks theRoot
a <- getAtom "_NET_DESKTOP_NAMES"
c <- getAtom "UTF8_STRING"
let names' = map fromIntegral $ concatMap ((++[0]) . encode) names
io $ changeProperty8 dpy r a c propModeReplace names'
setClientList :: [Window] -> X ()
setClientList wins = withDisplay $ \dpy -> do
-- (What order do we really need? Something about age and stacking)
r <- asks theRoot
c <- getAtom "WINDOW"
a <- getAtom "_NET_CLIENT_LIST"
io $ changeProperty32 dpy r a c propModeReplace (fmap fromIntegral wins)
a' <- getAtom "_NET_CLIENT_LIST_STACKING"
io $ changeProperty32 dpy r a' c propModeReplace (fmap fromIntegral wins)
setWindowDesktop :: (Integral a) => Window -> a -> X ()
setWindowDesktop win i = withDisplay $ \dpy -> do
a <- getAtom "_NET_WM_DESKTOP"
c <- getAtom "CARDINAL"
io $ changeProperty32 dpy win a c propModeReplace [fromIntegral i]
setSupported :: X ()
setSupported = withDisplay $ \dpy -> do
r <- asks theRoot
a <- getAtom "_NET_SUPPORTED"
c <- getAtom "ATOM"
supp <- mapM getAtom ["_NET_WM_STATE_HIDDEN"
,"_NET_NUMBER_OF_DESKTOPS"
,"_NET_CLIENT_LIST"
,"_NET_CLIENT_LIST_STACKING"
,"_NET_CURRENT_DESKTOP"
,"_NET_DESKTOP_NAMES"
,"_NET_ACTIVE_WINDOW"
,"_NET_WM_DESKTOP"
,"_NET_WM_STRUT"
]
io $ changeProperty32 dpy r a c propModeReplace (fmap fromIntegral supp)
setWMName "xmonad"
setActiveWindow :: X ()
setActiveWindow = withWindowSet $ \s -> withDisplay $ \dpy -> do
let w = fromMaybe none (W.peek s)
r <- asks theRoot
a <- getAtom "_NET_ACTIVE_WINDOW"
c <- getAtom "WINDOW"
io $ changeProperty32 dpy r a c propModeReplace [fromIntegral w]
