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<title>XMonad/Layout/DraggingVisualizer.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable, TypeSynonymInstances, MultiParamTypeClasses, FlexibleContexts #-}</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.DraggingVisualizer</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'>-- License : BSD3-style (see LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : jan.vornberger@informatik.uni-oldenburg.de</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : not portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- A helper module to visualize the process of dragging a window by</span>
<a name="line-13"></a><span class='hs-comment'>-- making it follow the mouse cursor. See "XMonad.Layout.WindowSwitcherDecoration"</span>
<a name="line-14"></a><span class='hs-comment'>-- for a module that makes use of this.</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'>DraggingVisualizer</span>
<a name="line-19"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>draggingVisualizer</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-conid'>DraggingVisualizerMsg</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-conid'>DraggingVisualizer</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-25"></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'>LayoutModifier</span>
<a name="line-26"></a>
<a name="line-27"></a><a name="DraggingVisualizer"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DraggingVisualizer</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DraggingVisualizer</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</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-layout'>)</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Read</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-layout'>)</span>
<a name="line-28"></a><a name="draggingVisualizer"></a><span class='hs-definition'>draggingVisualizer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-conid'>Window</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>l</span> <span class='hs-conid'>Window</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>DraggingVisualizer</span> <span class='hs-varid'>l</span> <span class='hs-conid'>Window</span>
<a name="line-29"></a><span class='hs-definition'>draggingVisualizer</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DraggingVisualizer</span> <span class='hs-conid'>Nothing</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="DraggingVisualizerMsg"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DraggingVisualizerMsg</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DraggingWindow</span> <span class='hs-conid'>Window</span> <span class='hs-conid'>Rectangle</span>
<a name="line-32"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DraggingStopped</span>
<a name="line-33"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>)</span>
<a name="line-34"></a><a name="instance%20Message%20DraggingVisualizerMsg%20instance%20LayoutModifier%20DraggingVisualizer%20Window"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Message</span> <span class='hs-conid'>DraggingVisualizerMsg</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="instance%20LayoutModifier%20DraggingVisualizer%20Window"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutModifier</span> <span class='hs-conid'>DraggingVisualizer</span> <span class='hs-conid'>Window</span> <span class='hs-keyword'>where</span>
<a name="line-37"></a> <span class='hs-varid'>modifierDescription</span> <span class='hs-layout'>(</span><span class='hs-conid'>DraggingVisualizer</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"DraggingVisualizer"</span>
<a name="line-38"></a> <span class='hs-varid'>pureModifier</span> <span class='hs-layout'>(</span><span class='hs-conid'>DraggingVisualizer</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>dragged</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>draggedWin</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>wrs</span> <span class='hs-keyglyph'>=</span>
<a name="line-39"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>draggedWin</span> <span class='hs-varop'>`elem`</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>wrs</span><span class='hs-layout'>)</span>
<a name="line-40"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>dragged</span> <span class='hs-conop'>:</span> <span class='hs-varid'>rest</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-41"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-varid'>wrs</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DraggingVisualizer</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-keyword'>where</span>
<a name="line-43"></a> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>w</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'>w</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>draggedWin</span><span class='hs-layout'>)</span> <span class='hs-varid'>wrs</span>
<a name="line-44"></a> <span class='hs-varid'>pureModifier</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>wrs</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>wrs</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-45"></a>
<a name="line-46"></a> <span class='hs-varid'>pureMess</span> <span class='hs-layout'>(</span><span class='hs-conid'>DraggingVisualizer</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>of</span>
<a name="line-47"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>DraggingWindow</span> <span class='hs-varid'>w</span> <span class='hs-varid'>rect</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DraggingVisualizer</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>rect</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>DraggingStopped</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DraggingVisualizer</span> <span class='hs-conid'>Nothing</span>
<a name="line-49"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
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