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|
-----------------------------------------------------------------------------
-- |
-- Module : XMonadContrib.UpdatePointer
-- Copyright : (c) Robert Marlow <robreim@bobturf.org>
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : Robert Marlow <robreim@bobturf.org>
-- Stability : stable
-- Portability : portable
--
-- Causes the pointer to follow whichever window focus changes to. Compliments
-- the idea of switching focus as the mouse crosses window boundaries to
-- keep the mouse near the currently focused window
--
-----------------------------------------------------------------------------
module XMonad.Actions.UpdatePointer
(
-- * Usage
-- $usage
updatePointer
, PointerPosition (..)
)
where
import XMonad
import Control.Monad
-- $usage
-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad
-- > import XMonad.Actions.UpdatePointer
--
-- Enable it by including it in your logHook definition. Eg:
--
-- > logHook = updatePointer Nearest
--
-- which will move the pointer to the nearest point of a newly focused window, or
--
-- > logHook = updatePointer (Relative 0.5 0.5)
--
-- which will move the pointer to the center of a newly focused window.
--
-- To use this with an existing logHook, use >> :
--
-- > logHook = dynamicLog
-- > >> updatePointer (Relative 1 1)
--
-- which moves the pointer to the bottom-right corner of the focused window.
data PointerPosition = Nearest | Relative Rational Rational
-- | Update the pointer's location to the currently focused
-- window unless it's already there, or unless the user was changing
-- focus with the mouse
updatePointer :: PointerPosition -> X ()
updatePointer p = withFocused $ \w -> do
dpy <- asks display
root <- asks theRoot
mouseIsMoving <- asks mouseFocused
wa <- io $ getWindowAttributes dpy w
(_sameRoot,_,w',rootx,rooty,_,_,_) <- io $ queryPointer dpy root
-- Can sameRoot ever be false in this case? I'm going to assume not
unless (w == w' || mouseIsMoving) $
case p of
Nearest -> do
let x = moveWithin rootx (wa_x wa) ((wa_x wa) + (wa_width wa))
let y = moveWithin rooty (wa_y wa) ((wa_y wa) + (wa_height wa))
io $ warpPointer dpy none root 0 0 0 0 (fromIntegral x) (fromIntegral y)
Relative h v ->
io $ warpPointer dpy none w 0 0 0 0
(fraction h (wa_width wa)) (fraction v (wa_height wa))
where fraction x y = floor (x * fromIntegral y)
moveWithin :: Integral a => a -> a -> a -> a
moveWithin current lower upper =
if current < lower
then lower
else if current > upper
then upper
else current
|
