-----------------------------------------------------------------------------
-- |
-- Module : Hhp
-- Copyright : (c) Andrea Rossato
-- License : BSD3
--
-- Maintainer : Andrea Rossato <andrea.rossato@unibz.it>
-- Stability : unstable
-- Portability : unportable
--
-- Hides the pointer after some inactivity
--
-----------------------------------------------------------------------------
module Main where
import Control.Concurrent
import Control.Exception
import Control.Monad
import Data.Bits
import Graphics.X11.Xlib
import Graphics.X11.Xlib.Extras
import System.Exit
import Utils
main :: IO ()
main = do
dpy <- openDisplay ""
let dflt = defaultScreen dpy
rootw <- rootWindow dpy dflt
waitForMotion dpy rootw
-- hides and grabs the pointer till the user moves it
hidePointer :: Display -> Window -> IO ()
hidePointer d w = do
let em = buttonPressMask .|. pointerMotionMask
cursor <- nullCursor d w
ps <- grabPointer d w False em grabModeAsync
grabModeAsync w cursor currentTime
when (ps /= grabSuccess) $ do
waitASecond 1
hidePointer d w
allocaXEvent $ \e -> do
maskEvent d em e
ungrabPointer d currentTime
waitForMotion d w
-- when the pointer is not moved a timer starts: after ten seconds, if
-- no motion interrupts the timer, the pointer is grabbed and made
-- invisible.
waitForMotion :: Display -> Window -> IO ()
waitForMotion d w = do
mt <- myThreadId
t <- forkIO (timer mt)
mask $ \restore -> do --block deprecated in Control.Exception, replaced with mask (Seth A. Yoder, 5/29/2014)
catch (restore $ stopAndWait t) (const $ hidePointer d w :: SomeException -> IO ())
where
-- interrupt the waiting for motion (and thus hide the pointer)
timer t = do
waitASecond 10
throwTo t (ErrorCall "done")
-- wait for the next motion, and restart the timer (?)
stopAndWait t = do
allocaXEvent $ maskEvent' d pointerMotionMask
-- this seems to just suspend the timer...
throwTo t (ExitSuccess)
waitForMotion d w
-- wait for a timer interrupt to hide the pointer