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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)
import Graphics.X11.Xlib.Extras
import Graphics.X11.Xinerama
import Graphics.X11.Xrandr
import Control.Arrow ((&&&))
import Control.Monad.Reader
import Control.Concurrent
import Control.Concurrent.STM
import Data.Bits
import Data.Map hiding (foldr, map, filter)
import qualified Data.Map as Map
import Data.List.NonEmpty (NonEmpty(..))
import Data.Maybe (fromJust, isJust)
import qualified Data.List.NonEmpty as NE
import Xmobar.System.Signal
import Xmobar.Config.Types ( persistent
, alpha
, font
, additionalFonts
, textOffset
, textOffsets
, position
, iconRoot
, Config
, Align(..)
, 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 (safeIndex, forkThread)
import Xmobar.Run.Loop (loop)
#ifndef THREADED_RUNTIME
import Xmobar.X11.Events(nextEvent')
#endif
#ifdef XFT
import Graphics.X11.Xft
#endif
runX :: XConf -> X () -> IO ()
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)
let ic = Map.empty
to = textOffset conf
ts = textOffsets conf ++ replicate (length fl) to
#ifdef XFT
xftInitFtLibrary
#endif
(r,w) <- createWin d fs conf
loop conf (startLoop (XConf d r w (fs :| fl) (to :| ts) ic 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
signalLoop :: XConf
-> [([Action], Position, Position)]
-> TMVar SignalType
-> TVar [String]
-> IO ()
signalLoop xc@(XConf d r w fs vos is cfg) as signal tv = do
typ <- atomically $ takeTMVar signal
case typ of
Wakeup -> do
str <- updateString cfg tv
xc' <- updateCache d w is (iconRoot cfg) str >>=
\c -> return xc { iconS = c }
as' <- updateActions xc r str
runX xc' $ drawInWin r str
signalLoop xc' as' signal tv
Reposition ->
reposWindow cfg
ChangeScreen -> do
ncfg <- updateConfigPosition cfg
reposWindow ncfg
Hide t -> hide (t*100*1000)
Reveal t -> reveal (t*100*1000)
Toggle t -> toggle t
TogglePersistent -> signalLoop
xc { config = cfg { persistent = not $ persistent cfg } } as signal tv
SetAlpha a -> signalLoop xc { config = cfg { alpha = a}} as signal tv
Action but x -> action but x
where
isPersistent = not $ persistent cfg
loopOn = signalLoop xc as signal tv
hide t
| t == 0 =
when isPersistent (hideWindow d w) >> loopOn
| otherwise = do
void $ forkIO
$ threadDelay t >> atomically (putTMVar signal $ Hide 0)
loopOn
reveal t
| t == 0 = do
when isPersistent (showWindow r cfg d w)
loopOn
| otherwise = do
void $ forkIO
$ threadDelay t >> atomically (putTMVar signal $ Reveal 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 vos is rcfg) as signal tv
updateConfigPosition ocfg =
case position ocfg of
OnScreen n o -> do
srs <- getScreenInfo d
return (if n == length srs
then
(ocfg {position = OnScreen 1 o})
else
(ocfg {position = OnScreen (n+1) o}))
o -> return (ocfg {position = OnScreen 1 o})
action button x = do
mapM_ runAction $
filter (\(Spawn b _) -> button `elem` b) $
concatMap (\(a,_,_) -> a) $
filter (\(_, from, to) -> x >= from && x <= to) as
loopOn
updateString :: Config -> TVar [String] -> IO [[Segment]]
updateString conf v = do
s <- readTVarIO v
let l:c:r:_ = s ++ repeat ""
liftIO $ mapM (parseString conf) [l, c, r]
updateActions :: XConf -> Rectangle -> [[Segment]]
-> IO [([Action], Position, Position)]
updateActions conf (Rectangle _ _ wid _) ~[left,center,right] = do
let (d,fs) = (display &&& fontListS) conf
strLn :: [Segment] -> IO [(Maybe [Action], Position, Position)]
strLn = liftIO . mapM getCoords
iconW i = maybe 0 Bitmap.width (lookup i $ iconS conf)
getCoords (Text s,_,i,a) =
textWidth d (safeIndex fs i) s >>= \tw -> return (a, 0, fi tw)
getCoords (Icon s,_,_,a) = return (a, 0, fi $ iconW s)
getCoords (Hspace w,_,_,a) = return (a, 0, fi w)
partCoord off xs = map (\(a, x, x') -> (fromJust a, x, x')) $
filter (\(a, _,_) -> isJust a) $
scanl (\(_,_,x') (a,_,w') -> (a, x', x' + w'))
(Nothing, 0, off)
xs
totSLen = foldr (\(_,_,len) -> (+) len) 0
remWidth xs = fi wid - totSLen xs
offs = 1
offset a xs = case a of
C -> (remWidth xs + offs) `div` 2
R -> remWidth xs
L -> offs
fmap concat $ mapM (\(a,xs) ->
(\xs' -> partCoord (offset a xs') xs') <$> strLn xs) $
zip [L,C,R] [left,center,right]
|
