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{-# LANGUAGE CPP #-}
------------------------------------------------------------------------------
-- |
-- Module: Xmobar.App.X11EventLoop
-- Copyright: (c) 2018, 2020, 2022, 2023 Jose Antonio Ortega Ruiz
-- License: BSD3-style (see LICENSE)
--
-- Maintainer: jao@gnu.org
-- Stability: unstable
-- Portability: portable
-- Created: Sat Nov 24, 2018 19:40
--
--
-- Event loop
--
------------------------------------------------------------------------------
module Xmobar.X11.Loop (x11Loop) where
import Prelude hiding (lookup)
import Control.Concurrent as Concurrent
import Control.Concurrent.STM as STM
import Control.Monad as MR
import Control.Monad.Reader as MR
import Data.Bits (Bits((.|.)))
import Data.List.NonEmpty (NonEmpty((:|)))
import qualified Data.List.NonEmpty as NE
import qualified Data.Map as Map
import qualified Graphics.X11.Xlib as X11
import qualified Graphics.X11.Xlib.Extras as X11x
import qualified Graphics.X11.Xinerama as Xinerama
import qualified Graphics.X11.Xrandr as Xrandr
import qualified Xmobar.Config.Types as C
import qualified Xmobar.Config.Template as CT
import qualified Xmobar.Run.Actions as A
import qualified Xmobar.Run.Loop as L
import qualified Xmobar.System.Utils as U
import qualified Xmobar.System.Signal as S
import qualified Xmobar.Draw.Types as D
import qualified Xmobar.X11.Types as T
import qualified Xmobar.X11.Text as Text
import qualified Xmobar.X11.Draw as Draw
import qualified Xmobar.X11.Bitmap as Bitmap
import qualified Xmobar.X11.Window as W
#ifndef THREADED_RUNTIME
import qualified Xmobar.X11.Events as E
#endif
runX :: T.XConf -> T.X a -> IO a
runX xc f = MR.runReaderT f xc
-- | Starts the main event loop thread
x11Loop :: C.Config -> IO ()
x11Loop conf = do
X11.initThreads
d <- X11.openDisplay ""
fs <- Text.initFont d (C.font conf)
fl <- mapM (Text.initFont d) (C.additionalFonts conf)
(r,w) <- W.createWin d fs conf
L.loop conf (startLoop (T.XConf d r w (fs :| fl) Map.empty conf))
startLoop :: T.XConf -> STM.TMVar S.SignalType -> STM.TVar [String] -> IO ()
startLoop xcfg sig tv = do
U.forkThread "X event handler" (eventLoop (T.display xcfg) (T.window xcfg) sig)
signalLoop xcfg [] sig tv
-- | Translates X11 events received by w to signals handled by signalLoop
eventLoop :: X11.Display -> X11.Window -> STM.TMVar S.SignalType -> IO ()
eventLoop dpy w signalv =
X11.allocaXEvent $ \e -> do
let root = X11.defaultRootWindow dpy
m = X11.exposureMask .|. X11.structureNotifyMask .|. X11.buttonPressMask
Xrandr.xrrSelectInput dpy root X11.rrScreenChangeNotifyMask
X11.selectInput dpy w m
MR.forever $ do
#ifdef THREADED_RUNTIME
X11.nextEvent dpy e
#else
E.nextEvent' dpy e
#endif
ev <- X11x.getEvent e
let send = STM.atomically . STM.putTMVar signalv
case ev of
X11x.ConfigureEvent {} -> send S.Reposition
X11x.RRScreenChangeNotifyEvent {} -> send S.Reposition
X11x.ExposeEvent {} -> send S.Wakeup
X11x.ButtonEvent {} -> send (S.Action b p)
where (b, p) = (X11x.ev_button ev, fromIntegral $ X11x.ev_x ev)
_ -> return ()
-- | Continuously wait for a signal from a thread or an interrupt handler.
-- The list of actions provides the positions of clickable rectangles,
-- and there is a mutable variable for received signals and the list
-- of strings updated by running monitors.
signalLoop ::
T.XConf -> D.Actions -> STM.TMVar S.SignalType -> STM.TVar [String] -> IO ()
signalLoop xc@(T.XConf d r w fs is cfg) actions signalv strs = do
typ <- STM.atomically $ STM.takeTMVar signalv
case typ of
S.Wakeup -> wakeup
S.Action button x -> runActions actions button x >> loopOn
S.Reposition -> reposWindow cfg
S.ChangeScreen -> updateConfigPosition d cfg >>= reposWindow
S.Hide t -> hiderev t S.Hide W.hideWindow
S.Reveal t -> hiderev t S.Reveal (W.showWindow r cfg)
S.Toggle t -> toggle t
S.TogglePersistent -> updateCfg $ cfg {C.persistent = not $ C.persistent cfg}
S.SetAlpha a -> updateCfg $ cfg {C.alpha = a}
where
loopOn' xc' = signalLoop xc' actions signalv strs
loopOn = loopOn' xc
updateCfg cfg' = loopOn' (xc {T.config = cfg'})
wakeup = do
segs <- parseSegments cfg strs
xc' <- updateIconCache xc segs
actions' <- runX xc' (Draw.draw segs)
signalLoop xc' actions' signalv strs
hiderev t sign op
| t == 0 = MR.unless (C.persistent cfg) (op d w) >> loopOn
| otherwise = do
MR.void $ Concurrent.forkIO
$ Concurrent.threadDelay (t*100*1000) >>
STM.atomically (STM.putTMVar signalv $ sign 0)
loopOn
toggle t = do
ismapped <- W.isMapped d w
let s = if ismapped then S.Hide t else S.Reveal t
STM.atomically (STM.putTMVar signalv s)
loopOn
reposWindow rcfg = do
r' <- W.repositionWin d w (NE.head fs) rcfg
signalLoop (T.XConf d r' w fs is rcfg) actions signalv strs
parseSegments :: C.Config -> STM.TVar [String] -> IO [[C.Segment]]
parseSegments conf v = do
s <- STM.readTVarIO v
let l:c:r:_ = s ++ repeat ""
return $ map (CT.parseString conf) [l, c, r]
updateIconCache :: T.XConf -> [[C.Segment]] -> IO T.XConf
updateIconCache xc@(T.XConf d _ w _ c cfg) segs = do
let paths = [p | (C.Icon p, _, _, _) <- concat segs]
c' <- Bitmap.updateCache d w c (C.iconRoot cfg) paths
return $ xc {T.iconCache = c'}
updateConfigPosition :: X11.Display -> C.Config -> IO C.Config
updateConfigPosition disp cfg =
case C.position cfg of
C.OnScreen n o -> do
srs <- Xinerama.getScreenInfo disp
return (if n == length srs
then (cfg {C.position = C.OnScreen 1 o})
else (cfg {C.position = C.OnScreen (n+1) o}))
o -> return (cfg {C.position = C.OnScreen 1 o})
runActions :: D.Actions -> A.Button -> X11.Position -> IO ()
runActions actions button pos =
mapM_ A.runAction $
filter (\(A.Spawn b _) -> button `elem` b) $
concatMap (\(a,_,_) -> a) $
filter (\(_, from, to) -> pos' >= from && pos' <= to) actions
where pos' = fromIntegral pos
|
