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82 lines
2.5 KiB
Haskell
82 lines
2.5 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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-- $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 (RelativePosition 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 unless it's already there
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updatePointer :: PointerPosition -> X ()
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updatePointer p = withFocused $ \w -> do
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dpy <- asks display
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root <- asks theRoot
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wa <- io $ getWindowAttributes dpy w
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(_sameRoot,_,w',rootx,rooty,_,_,_) <- io $ queryPointer dpy root
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-- Can sameRoot ever be false in this case? I'm going to assume not
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unless (w == w') $
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case p of
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Nearest -> do
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let x = moveWithin rootx (wa_x wa) ((wa_x wa) + (wa_width wa))
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let y = moveWithin rooty (wa_y wa) ((wa_y wa) + (wa_height wa))
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io $ warpPointer dpy none root 0 0 0 0 (fromIntegral x) (fromIntegral y)
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Relative h v ->
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io $ warpPointer dpy none w 0 0 0 0
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(fraction h (wa_width wa)) (fraction v (wa_height wa))
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where fraction x y = floor (x * fromIntegral y)
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moveWithin :: Integral a => a -> a -> a -> a
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moveWithin current lower upper =
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if current < lower
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then lower
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else if current > upper
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then upper
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else current
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