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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
import XMonad.StackSet (member, peek, screenDetail, current)
-- $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 or empty screen unless it's already there, or unless the user was changing
-- focus with the mouse
updatePointer :: PointerPosition -> X ()
updatePointer p = do
ws <- gets windowset
dpy <- asks display
rect <- case peek ws of
Nothing -> return $ (screenRect . screenDetail .current) ws
Just w -> windowAttributesToRectangle `fmap` io (getWindowAttributes dpy w)
root <- asks theRoot
mouseIsMoving <- asks mouseFocused
(_sameRoot,_,currentWindow,rootx,rooty,_,_,_) <- io $ queryPointer dpy root
unless (pointWithin (fi rootx) (fi rooty) rect
|| mouseIsMoving
|| not (currentWindow `member` ws || currentWindow == none)) $
case p of
Nearest -> do
let x = moveWithin (fi rootx) (rect_x rect) (fi (rect_x rect) + fi (rect_width rect))
y = moveWithin (fi rooty) (rect_y rect) (fi (rect_y rect) + fi (rect_height rect))
io $ warpPointer dpy none root 0 0 0 0 x y
Relative h v ->
io $ warpPointer dpy none root 0 0 0 0
(rect_x rect + fraction h (rect_width rect))
(rect_y rect + fraction v (rect_height rect))
where fraction x y = floor (x * fromIntegral y)
windowAttributesToRectangle :: WindowAttributes -> Rectangle
windowAttributesToRectangle wa = Rectangle (fi (wa_x wa)) (fi (wa_y wa))
(fi (wa_width wa)) (fi (wa_height wa))
moveWithin :: Ord a => a -> a -> a -> a
moveWithin now lower upper =
if now < lower
then lower
else if now > upper
then upper
else now
fi :: (Num b, Integral a) => a -> b
fi = fromIntegral
|
