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<title>XMonad/Layout/WindowSwitcherDecoration.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}</span>
<a name="line-2"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : XMonad.Layout.WindowSwitcherDecoration</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Jan Vornberger 2009</span>
<a name="line-6"></a><span class='hs-comment'>-- Alejandro Serrano 2010</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD3-style (see LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : jan.vornberger@informatik.uni-oldenburg.de</span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : not portable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- A decoration that allows to switch the position of windows by dragging</span>
<a name="line-14"></a><span class='hs-comment'>-- them onto each other.</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>WindowSwitcherDecoration</span>
<a name="line-19"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Usage:</span>
<a name="line-20"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-21"></a> <span class='hs-varid'>windowSwitcherDecoration</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-varid'>windowSwitcherDecorationWithButtons</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-varid'>windowSwitcherDecorationWithImageButtons</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-conid'>WindowSwitcherDecoration</span><span class='hs-layout'>,</span> <span class='hs-conid'>ImageWindowSwitcherDecoration</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>Decoration</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>DecorationAddons</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>ImageButtonDecoration</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>DraggingVisualizer</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>StackSet</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span><span class='hs-layout'>(</span><span class='hs-conid'>CInt</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-comment'>-- $usage</span>
<a name="line-37"></a><span class='hs-comment'>-- You can use this module with the following in your</span>
<a name="line-38"></a><span class='hs-comment'>-- @~\/.xmonad\/xmonad.hs@:</span>
<a name="line-39"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><span class='hs-comment'>-- > import XMonad.Layout.WindowSwitcherDecoration</span>
<a name="line-41"></a><span class='hs-comment'>-- > import XMonad.Layout.DraggingVisualizer</span>
<a name="line-42"></a><span class='hs-comment'>--</span>
<a name="line-43"></a><span class='hs-comment'>-- Then edit your @layoutHook@ by adding the WindowSwitcherDecoration to</span>
<a name="line-44"></a><span class='hs-comment'>-- your layout:</span>
<a name="line-45"></a><span class='hs-comment'>--</span>
<a name="line-46"></a><span class='hs-comment'>-- > myL = windowSwitcherDecoration shrinkText defaultTheme (draggingVisualizer $ layoutHook defaultConfig)</span>
<a name="line-47"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myL }</span>
<a name="line-48"></a><span class='hs-comment'>--</span>
<a name="line-49"></a><span class='hs-comment'>-- There is also a version of the decoration that contains buttons like</span>
<a name="line-50"></a><span class='hs-comment'>-- "XMonad.Layout.ButtonDecoration". To use that version, you will need to</span>
<a name="line-51"></a><span class='hs-comment'>-- import "XMonad.Layout.DecorationAddons" as well and modify your @layoutHook@</span>
<a name="line-52"></a><span class='hs-comment'>-- in the following way:</span>
<a name="line-53"></a><span class='hs-comment'>--</span>
<a name="line-54"></a><span class='hs-comment'>-- > import XMonad.Layout.DecorationAddons</span>
<a name="line-55"></a><span class='hs-comment'>-- ></span>
<a name="line-56"></a><span class='hs-comment'>-- > myL = windowSwitcherDecorationWithButtons shrinkText defaultThemeWithButtons (draggingVisualizer $ layoutHook defaultConfig)</span>
<a name="line-57"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myL }</span>
<a name="line-58"></a><span class='hs-comment'>--</span>
<a name="line-59"></a><span class='hs-comment'>-- Additionaly, there is a version of the decoration that contains image buttons like</span>
<a name="line-60"></a><span class='hs-comment'>-- "XMonad.Layout.ImageButtonDecoration". To use that version, you will need to</span>
<a name="line-61"></a><span class='hs-comment'>-- import "XMonad.Layout.ImageButtonDecoration" as well and modify your @layoutHook@</span>
<a name="line-62"></a><span class='hs-comment'>-- in the following way:</span>
<a name="line-63"></a><span class='hs-comment'>--</span>
<a name="line-64"></a><span class='hs-comment'>-- > import XMonad.Layout.ImageButtonDecoration</span>
<a name="line-65"></a><span class='hs-comment'>-- ></span>
<a name="line-66"></a><span class='hs-comment'>-- > myL = windowSwitcherDecorationWithImageButtons shrinkText defaultThemeWithImageButtons (draggingVisualizer $ layoutHook defaultConfig)</span>
<a name="line-67"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myL }</span>
<a name="line-68"></a><span class='hs-comment'>--</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="windowSwitcherDecoration"></a><span class='hs-definition'>windowSwitcherDecoration</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Shrinker</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Theme</span>
<a name="line-71"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Decoration</span> <span class='hs-conid'>WindowSwitcherDecoration</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-72"></a><span class='hs-definition'>windowSwitcherDecoration</span> <span class='hs-varid'>s</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decoration</span> <span class='hs-varid'>s</span> <span class='hs-varid'>c</span> <span class='hs-varop'>$</span> <span class='hs-conid'>WSD</span> <span class='hs-conid'>False</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="windowSwitcherDecorationWithButtons"></a><span class='hs-definition'>windowSwitcherDecorationWithButtons</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Shrinker</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Theme</span>
<a name="line-75"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Decoration</span> <span class='hs-conid'>WindowSwitcherDecoration</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-76"></a><span class='hs-definition'>windowSwitcherDecorationWithButtons</span> <span class='hs-varid'>s</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decoration</span> <span class='hs-varid'>s</span> <span class='hs-varid'>c</span> <span class='hs-varop'>$</span> <span class='hs-conid'>WSD</span> <span class='hs-conid'>True</span>
<a name="line-77"></a>
<a name="line-78"></a><a name="WindowSwitcherDecoration"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>WindowSwitcherDecoration</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>WSD</span> <span class='hs-conid'>Bool</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span><span class='hs-layout'>)</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="instance%20DecorationStyle%20WindowSwitcherDecoration%20a"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>DecorationStyle</span> <span class='hs-conid'>WindowSwitcherDecoration</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-81"></a> <span class='hs-varid'>describeDeco</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"WindowSwitcherDeco"</span>
<a name="line-82"></a>
<a name="line-83"></a> <span class='hs-varid'>decorationCatchClicksHook</span> <span class='hs-layout'>(</span><span class='hs-conid'>WSD</span> <span class='hs-varid'>withButtons</span><span class='hs-layout'>)</span> <span class='hs-varid'>mainw</span> <span class='hs-varid'>dFL</span> <span class='hs-varid'>dFR</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>withButtons</span>
<a name="line-84"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>titleBarButtonHandler</span> <span class='hs-varid'>mainw</span> <span class='hs-varid'>dFL</span> <span class='hs-varid'>dFR</span>
<a name="line-85"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-86"></a> <span class='hs-varid'>decorationWhileDraggingHook</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>ex</span> <span class='hs-varid'>ey</span> <span class='hs-layout'>(</span><span class='hs-varid'>mainw</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>handleTiledDraggingInProgress</span> <span class='hs-varid'>ex</span> <span class='hs-varid'>ey</span> <span class='hs-layout'>(</span><span class='hs-varid'>mainw</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-87"></a> <span class='hs-varid'>decorationAfterDraggingHook</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-varid'>mainw</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>decoWin</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>focus</span> <span class='hs-varid'>mainw</span>
<a name="line-88"></a> <span class='hs-varid'>hasCrossed</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleScreenCrossing</span> <span class='hs-varid'>mainw</span> <span class='hs-varid'>decoWin</span>
<a name="line-89"></a> <span class='hs-varid'>unless</span> <span class='hs-varid'>hasCrossed</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>sendMessage</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DraggingStopped</span>
<a name="line-90"></a> <span class='hs-varid'>performWindowSwitching</span> <span class='hs-varid'>mainw</span>
<a name="line-91"></a>
<a name="line-92"></a><span class='hs-comment'>-- Note: the image button code is duplicated from the above</span>
<a name="line-93"></a><span class='hs-comment'>-- because the title bar handle is different</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="windowSwitcherDecorationWithImageButtons"></a><span class='hs-definition'>windowSwitcherDecorationWithImageButtons</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Shrinker</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Theme</span>
<a name="line-96"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Decoration</span> <span class='hs-conid'>ImageWindowSwitcherDecoration</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-97"></a><span class='hs-definition'>windowSwitcherDecorationWithImageButtons</span> <span class='hs-varid'>s</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decoration</span> <span class='hs-varid'>s</span> <span class='hs-varid'>c</span> <span class='hs-varop'>$</span> <span class='hs-conid'>IWSD</span> <span class='hs-conid'>True</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="ImageWindowSwitcherDecoration"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ImageWindowSwitcherDecoration</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IWSD</span> <span class='hs-conid'>Bool</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span><span class='hs-layout'>)</span>
<a name="line-100"></a>
<a name="line-101"></a><a name="instance%20DecorationStyle%20ImageWindowSwitcherDecoration%20a"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>DecorationStyle</span> <span class='hs-conid'>ImageWindowSwitcherDecoration</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-102"></a> <span class='hs-varid'>describeDeco</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"ImageWindowSwitcherDeco"</span>
<a name="line-103"></a>
<a name="line-104"></a> <span class='hs-varid'>decorationCatchClicksHook</span> <span class='hs-layout'>(</span><span class='hs-conid'>IWSD</span> <span class='hs-varid'>withButtons</span><span class='hs-layout'>)</span> <span class='hs-varid'>mainw</span> <span class='hs-varid'>dFL</span> <span class='hs-varid'>dFR</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>withButtons</span>
<a name="line-105"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>imageTitleBarButtonHandler</span> <span class='hs-varid'>mainw</span> <span class='hs-varid'>dFL</span> <span class='hs-varid'>dFR</span>
<a name="line-106"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-107"></a> <span class='hs-varid'>decorationWhileDraggingHook</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>ex</span> <span class='hs-varid'>ey</span> <span class='hs-layout'>(</span><span class='hs-varid'>mainw</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>handleTiledDraggingInProgress</span> <span class='hs-varid'>ex</span> <span class='hs-varid'>ey</span> <span class='hs-layout'>(</span><span class='hs-varid'>mainw</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-108"></a> <span class='hs-varid'>decorationAfterDraggingHook</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-varid'>mainw</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>decoWin</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>focus</span> <span class='hs-varid'>mainw</span>
<a name="line-109"></a> <span class='hs-varid'>hasCrossed</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleScreenCrossing</span> <span class='hs-varid'>mainw</span> <span class='hs-varid'>decoWin</span>
<a name="line-110"></a> <span class='hs-varid'>unless</span> <span class='hs-varid'>hasCrossed</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>sendMessage</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DraggingStopped</span>
<a name="line-111"></a> <span class='hs-varid'>performWindowSwitching</span> <span class='hs-varid'>mainw</span>
<a name="line-112"></a>
<a name="line-113"></a><a name="handleTiledDraggingInProgress"></a><span class='hs-definition'>handleTiledDraggingInProgress</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Window</span><span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-114"></a><span class='hs-definition'>handleTiledDraggingInProgress</span> <span class='hs-varid'>ex</span> <span class='hs-varid'>ey</span> <span class='hs-layout'>(</span><span class='hs-varid'>mainw</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-115"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>rect</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Rectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>fi</span> <span class='hs-varid'>ex</span> <span class='hs-comment'>-</span> <span class='hs-varid'>rect_x</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-116"></a> <span class='hs-layout'>(</span><span class='hs-varid'>y</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>fi</span> <span class='hs-varid'>ey</span> <span class='hs-comment'>-</span> <span class='hs-varid'>rect_y</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-117"></a> <span class='hs-layout'>(</span><span class='hs-varid'>rect_width</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-118"></a> <span class='hs-layout'>(</span><span class='hs-varid'>rect_height</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-119"></a> <span class='hs-varid'>sendMessage</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DraggingWindow</span> <span class='hs-varid'>mainw</span> <span class='hs-varid'>rect</span>
<a name="line-120"></a>
<a name="line-121"></a><a name="performWindowSwitching"></a><span class='hs-definition'>performWindowSwitching</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Window</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-122"></a><span class='hs-definition'>performWindowSwitching</span> <span class='hs-varid'>win</span> <span class='hs-keyglyph'>=</span>
<a name="line-123"></a> <span class='hs-varid'>withDisplay</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-124"></a> <span class='hs-varid'>root</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>asks</span> <span class='hs-varid'>theRoot</span>
<a name="line-125"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>selWin</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-varid'>queryPointer</span> <span class='hs-varid'>d</span> <span class='hs-varid'>root</span>
<a name="line-126"></a> <span class='hs-varid'>ws</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>gets</span> <span class='hs-varid'>windowset</span>
<a name="line-127"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>allWindows</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varid'>ws</span>
<a name="line-128"></a> <span class='hs-comment'>-- do a little double check to be sure</span>
<a name="line-129"></a> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>win</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>allWindows</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span> <span class='hs-layout'>(</span><span class='hs-varid'>selWin</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>allWindows</span><span class='hs-layout'>)</span>
<a name="line-130"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-131"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>allWindowsSwitched</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>switchEntries</span> <span class='hs-varid'>win</span> <span class='hs-varid'>selWin</span><span class='hs-layout'>)</span> <span class='hs-varid'>allWindows</span>
<a name="line-132"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>ls</span><span class='hs-layout'>,</span> <span class='hs-varid'>t</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>break</span> <span class='hs-layout'>(</span><span class='hs-varid'>win</span> <span class='hs-varop'>==</span><span class='hs-layout'>)</span> <span class='hs-varid'>allWindowsSwitched</span>
<a name="line-133"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>newStack</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>ls</span><span class='hs-layout'>)</span> <span class='hs-varid'>rs</span>
<a name="line-134"></a> <span class='hs-varid'>windows</span> <span class='hs-varop'>$</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>modify'</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>newStack</span>
<a name="line-135"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-136"></a> <span class='hs-keyword'>where</span>
<a name="line-137"></a> <span class='hs-varid'>switchEntries</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>x</span>
<a name="line-138"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>b</span>
<a name="line-139"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-140"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
</pre></body>
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