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|
{-# LANGUAGE CPP #-}
------------------------------------------------------------------------------
-- |
-- Module: Xmobar.App.X11EventLoop
-- Copyright: (c) 2018, 2020, 2022 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 Graphics.X11.Xlib hiding (textExtents, textWidth, Segment, Button)
import Graphics.X11.Xlib.Extras
import Graphics.X11.Xinerama
import Graphics.X11.Xrandr
import Control.Monad.Reader
import Control.Concurrent
import Control.Concurrent.STM
import Data.Bits
import qualified Data.Map as Map
import Data.List.NonEmpty (NonEmpty(..))
import qualified Data.List.NonEmpty as NE
import Xmobar.System.Signal
import Xmobar.Config.Types ( persistent
, alpha
, font
, additionalFonts
, position
, iconRoot
, Config
, XPosition(..))
import Xmobar.Run.Actions
import Xmobar.Run.Parsers
import Xmobar.X11.Window
import Xmobar.X11.Text
import Xmobar.X11.Draw
import Xmobar.X11.Bitmap as Bitmap
import Xmobar.X11.Types
import Xmobar.System.Utils (forkThread)
import Xmobar.Run.Loop (loop)
#ifndef THREADED_RUNTIME
import Xmobar.X11.Events(nextEvent')
#endif
runX :: XConf -> X a -> IO a
runX xc f = runReaderT f xc
-- | Starts the main event loop and threads
x11Loop :: Config -> IO ()
x11Loop conf = do
initThreads
d <- openDisplay ""
fs <- initFont d (font conf)
fl <- mapM (initFont d) (additionalFonts conf)
(r,w) <- createWin d fs conf
loop conf (startLoop (XConf d r w (fs :| fl) Map.empty conf))
startLoop :: XConf -> TMVar SignalType -> TVar [String] -> IO ()
startLoop xcfg@(XConf _ _ w _ _ _) sig tv = do
forkThread "X event handler" (x11EventLoop w sig)
signalLoop xcfg [] sig tv
-- | Translates X11 events received by w to signals handled by signalLoop
x11EventLoop :: Window -> TMVar SignalType -> IO ()
x11EventLoop w signal =
allocaXEvent $ \e -> do
dpy <- openDisplay ""
xrrSelectInput dpy (defaultRootWindow dpy) rrScreenChangeNotifyMask
selectInput dpy w (exposureMask .|. structureNotifyMask .|. buttonPressMask)
forever $ do
#ifdef THREADED_RUNTIME
nextEvent dpy e
#else
nextEvent' dpy e
#endif
ev <- getEvent e
case ev of
ConfigureEvent {} -> atomically $ putTMVar signal Reposition
ExposeEvent {} -> atomically $ putTMVar signal Wakeup
RRScreenChangeNotifyEvent {} -> atomically $ putTMVar signal Reposition
ButtonEvent {} -> atomically $
putTMVar signal (Action (ev_button ev) (fi $ 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 :: XConf
-> [([Action], Position, Position)]
-> TMVar SignalType
-> TVar [String]
-> IO ()
signalLoop xc@(XConf d r w fs is cfg) actions signal strs = do
typ <- atomically $ takeTMVar signal
case typ of
Wakeup -> wakeup
Action button x -> runActions actions button x >> loopOn
Reposition -> reposWindow cfg
ChangeScreen -> updateConfigPosition d cfg >>= reposWindow
Hide t -> hiderev t Hide hideWindow
Reveal t -> hiderev t Reveal (showWindow r cfg)
Toggle t -> toggle t
TogglePersistent -> updateCfg $ cfg {persistent = not $ persistent cfg}
SetAlpha a -> updateCfg $ cfg {alpha = a}
where
loopOn' xc' = signalLoop xc' actions signal strs
loopOn = loopOn' xc
updateCfg cfg' = loopOn' (xc {config = cfg'})
wakeup = do
segs <- parseSegments cfg strs
xc' <- updateIconCache xc segs
actions' <- runX xc' $ drawInWin segs
signalLoop xc' actions' signal strs
hiderev t sign op
| t == 0 = unless (persistent cfg) (op d w) >> loopOn
| otherwise = do
void $ forkIO
$ threadDelay (t*100*1000) >>
atomically (putTMVar signal $ sign 0)
loopOn
toggle t = do
ismapped <- isMapped d w
atomically (putTMVar signal $ if ismapped then Hide t else Reveal t)
loopOn
reposWindow rcfg = do
r' <- repositionWin d w (NE.head fs) rcfg
signalLoop (XConf d r' w fs is rcfg) actions signal strs
parseSegments :: Config -> TVar [String] -> IO [[Segment]]
parseSegments conf v = do
s <- readTVarIO v
let l:c:r:_ = s ++ repeat ""
liftIO $ mapM (parseString conf) [l, c, r]
updateIconCache :: XConf -> [[Segment]] -> IO XConf
updateIconCache xc@(XConf d _ w _ c cfg) segs = do
c' <- updateCache d w c (iconRoot cfg) [p | (Icon p, _, _, _) <- concat segs]
return $ xc {iconCache = c'}
updateConfigPosition :: Display -> Config -> IO Config
updateConfigPosition disp cfg =
case position cfg of
OnScreen n o -> do
srs <- getScreenInfo disp
return (if n == length srs
then (cfg {position = OnScreen 1 o})
else (cfg {position = OnScreen (n+1) o}))
o -> return (cfg {position = OnScreen 1 o})
runActions :: [ActionPos] -> Button -> Position -> IO ()
runActions actions button pos =
mapM_ runAction $
filter (\(Spawn b _) -> button `elem` b) $
concatMap (\(a,_,_) -> a) $
filter (\(_, from, to) -> pos >= from && pos <= to) actions
|
