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96 lines
3.2 KiB
Haskell
96 lines
3.2 KiB
Haskell
-----------------------------------------------------------------------------
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-- |
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-- Module : XMonadContrib.UpdatePointer
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-- Copyright : (c) Robert Marlow <robreim@bobturf.org>
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-- License : BSD3-style (see LICENSE)
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--
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-- Maintainer : Robert Marlow <robreim@bobturf.org>
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-- Stability : stable
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-- Portability : portable
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--
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-- Causes the pointer to follow whichever window focus changes to. Compliments
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-- the idea of switching focus as the mouse crosses window boundaries to
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-- keep the mouse near the currently focused window
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--
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-----------------------------------------------------------------------------
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module XMonad.Actions.UpdatePointer
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(
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-- * Usage
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-- $usage
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updatePointer
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, PointerPosition (..)
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)
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where
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import XMonad
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import Control.Monad
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import XMonad.StackSet (member, peek, screenDetail, current)
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-- $usage
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-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
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--
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-- > import XMonad
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-- > import XMonad.Actions.UpdatePointer
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--
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-- Enable it by including it in your logHook definition. Eg:
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--
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-- > logHook = updatePointer Nearest
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--
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-- which will move the pointer to the nearest point of a newly focused window, or
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--
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-- > logHook = updatePointer (Relative 0.5 0.5)
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--
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-- which will move the pointer to the center of a newly focused window.
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--
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-- To use this with an existing logHook, use >> :
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--
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-- > logHook = dynamicLog
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-- > >> updatePointer (Relative 1 1)
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--
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-- which moves the pointer to the bottom-right corner of the focused window.
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data PointerPosition = Nearest | Relative Rational Rational
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-- | Update the pointer's location to the currently focused
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-- window or empty screen unless it's already there, or unless the user was changing
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-- focus with the mouse
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updatePointer :: PointerPosition -> X ()
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updatePointer p = do
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ws <- gets windowset
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dpy <- asks display
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rect <- case peek ws of
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Nothing -> return $ (screenRect . screenDetail .current) ws
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Just w -> windowAttributesToRectangle `fmap` io (getWindowAttributes dpy w)
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root <- asks theRoot
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mouseIsMoving <- asks mouseFocused
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(_sameRoot,_,currentWindow,rootx,rooty,_,_,_) <- io $ queryPointer dpy root
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unless (pointWithin (fi rootx) (fi rooty) rect
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|| mouseIsMoving
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|| not (currentWindow `member` ws || currentWindow == none)) $
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case p of
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Nearest -> do
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let x = moveWithin (fi rootx) (rect_x rect) (fi (rect_x rect) + fi (rect_width rect))
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y = moveWithin (fi rooty) (rect_y rect) (fi (rect_y rect) + fi (rect_height rect))
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io $ warpPointer dpy none root 0 0 0 0 x y
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Relative h v ->
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io $ warpPointer dpy none root 0 0 0 0
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(rect_x rect + fraction h (rect_width rect))
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(rect_y rect + fraction v (rect_height rect))
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where fraction x y = floor (x * fromIntegral y)
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windowAttributesToRectangle :: WindowAttributes -> Rectangle
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windowAttributesToRectangle wa = Rectangle (fi (wa_x wa)) (fi (wa_y wa))
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(fi (wa_width wa)) (fi (wa_height wa))
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moveWithin :: Ord a => a -> a -> a -> a
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moveWithin now lower upper =
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if now < lower
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then lower
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else if now > upper
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then upper
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else now
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fi :: (Num b, Integral a) => a -> b
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fi = fromIntegral
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