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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_GHC -fglasgow-exts #-}</span> <span class='hs-comment'>-- For deriving Data/Typeable</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, PatternGuards, TypeSynonymInstances #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-comment'>-- --------------------------------------------------------------------------</span>
<a name="line-5"></a><span class='hs-comment'>-- |</span>
<a name="line-6"></a><span class='hs-comment'>-- Module : XMonad.Layout</span>
<a name="line-7"></a><span class='hs-comment'>-- Copyright : (c) Spencer Janssen 2007</span>
<a name="line-8"></a><span class='hs-comment'>-- License : BSD3-style (see LICENSE)</span>
<a name="line-9"></a><span class='hs-comment'>--</span>
<a name="line-10"></a><span class='hs-comment'>-- Maintainer : spencerjanssen@gmail.com</span>
<a name="line-11"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-12"></a><span class='hs-comment'>-- Portability : not portable, Typeable deriving, mtl, posix</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- The collection of core layouts.</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-layout'>(</span>
<a name="line-19"></a> <span class='hs-conid'>Full</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Tall</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Mirror</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-conid'>Resize</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>IncMasterN</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Choose</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>|||</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>ChangeLayout</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-varid'>mirrorRect</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitVertically</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-varid'>splitHorizontally</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitHorizontallyBy</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitVerticallyBy</span><span class='hs-layout'>,</span>
<a name="line-23"></a>
<a name="line-24"></a> <span class='hs-varid'>tile</span>
<a name="line-25"></a>
<a name="line-26"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-27"></a>
<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'>Core</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</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-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-31"></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'>W</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Arrow</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>***</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>second</span><span class='hs-layout'>)</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'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMaybe</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="Resize"></a><span class='hs-comment'>-- | Change the size of the master pane.</span>
<a name="line-39"></a><a name="Resize"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Resize</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Shrink</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Expand</span> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Typeable</span>
<a name="line-40"></a>
<a name="line-41"></a><a name="IncMasterN"></a><span class='hs-comment'>-- | Increase the number of clients in the master pane.</span>
<a name="line-42"></a><a name="IncMasterN"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>IncMasterN</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IncMasterN</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Typeable</span>
<a name="line-43"></a>
<a name="line-44"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Message</span> <span class='hs-conid'>Resize</span>
<a name="line-45"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Message</span> <span class='hs-conid'>IncMasterN</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="Full"></a><span class='hs-comment'>-- | Simple fullscreen mode. Renders the focused window fullscreen.</span>
<a name="line-48"></a><a name="Full"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Full</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Full</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-49"></a>
<a name="line-50"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-conid'>Full</span> <span class='hs-varid'>a</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="Tall"></a><span class='hs-comment'>-- | The builtin tiling mode of xmonad. Supports 'Shrink', 'Expand' and</span>
<a name="line-53"></a><a name="Tall"></a><span class='hs-comment'>-- 'IncMasterN'.</span>
<a name="line-54"></a><a name="Tall"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Tall</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Tall</span> <span class='hs-layout'>{</span> <span class='hs-varid'>tallNMaster</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ The default number of windows in the master pane (default: 1)</span>
<a name="line-55"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tallRatioIncrement</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span> <span class='hs-comment'>-- ^ Percent of screen to increment by when resizing panes (default: 3/100)</span>
<a name="line-56"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tallRatio</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span> <span class='hs-layout'>}</span> <span class='hs-comment'>-- ^ Default proportion of screen occupied by master pane (default: 1/2)</span>
<a name="line-57"></a> <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-58"></a> <span class='hs-comment'>-- TODO should be capped [0..1] ..</span>
<a name="line-59"></a>
<a name="line-60"></a><span class='hs-comment'>-- a nice pure layout, lots of properties for the layout, and its messages, in Properties.hs</span>
<a name="line-61"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-conid'>Tall</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-62"></a> <span class='hs-varid'>pureLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Tall</span> <span class='hs-varid'>nmaster</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>frac</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zip</span> <span class='hs-varid'>ws</span> <span class='hs-varid'>rs</span>
<a name="line-63"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>ws</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>integrate</span> <span class='hs-varid'>s</span>
<a name="line-64"></a> <span class='hs-varid'>rs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tile</span> <span class='hs-varid'>frac</span> <span class='hs-varid'>r</span> <span class='hs-varid'>nmaster</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>ws</span><span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a> <span class='hs-varid'>pureMessage</span> <span class='hs-layout'>(</span><span class='hs-conid'>Tall</span> <span class='hs-varid'>nmaster</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>frac</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-67"></a> <span class='hs-varid'>msum</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>resize</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-68"></a> <span class='hs-layout'>,</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>incmastern</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-69"></a>
<a name="line-70"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>resize</span> <span class='hs-conid'>Shrink</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Tall</span> <span class='hs-varid'>nmaster</span> <span class='hs-varid'>delta</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>frac</span><span class='hs-comment'>-</span><span class='hs-varid'>delta</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-varid'>resize</span> <span class='hs-conid'>Expand</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Tall</span> <span class='hs-varid'>nmaster</span> <span class='hs-varid'>delta</span> <span class='hs-layout'>(</span><span class='hs-varid'>min</span> <span class='hs-num'>1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>frac</span><span class='hs-varop'>+</span><span class='hs-varid'>delta</span><span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-varid'>incmastern</span> <span class='hs-layout'>(</span><span class='hs-conid'>IncMasterN</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Tall</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>nmaster</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>frac</span>
<a name="line-73"></a>
<a name="line-74"></a> <span class='hs-varid'>description</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Tall"</span>
<a name="line-75"></a>
<a name="line-76"></a><a name="tile"></a><span class='hs-comment'>-- | Compute the positions for windows using the default two-pane tiling</span>
<a name="line-77"></a><span class='hs-comment'>-- algorithm.</span>
<a name="line-78"></a><span class='hs-comment'>--</span>
<a name="line-79"></a><span class='hs-comment'>-- The screen is divided into two panes. All clients are</span>
<a name="line-80"></a><span class='hs-comment'>-- then partioned between these two panes. One pane, the master, by</span>
<a name="line-81"></a><span class='hs-comment'>-- convention has the least number of windows in it.</span>
<a name="line-82"></a><span class='hs-definition'>tile</span>
<a name="line-83"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Rational</span> <span class='hs-comment'>-- ^ @frac@, what proportion of the screen to devote to the master area</span>
<a name="line-84"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-comment'>-- ^ @r@, the rectangle representing the screen</span>
<a name="line-85"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ @nmaster@, the number of windows in the master pane</span>
<a name="line-86"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ @n@, the total number of windows to tile</span>
<a name="line-87"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Rectangle</span><span class='hs-keyglyph'>]</span>
<a name="line-88"></a><span class='hs-definition'>tile</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>nmaster</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-varid'>nmaster</span> <span class='hs-varop'>||</span> <span class='hs-varid'>nmaster</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-89"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>n</span> <span class='hs-varid'>r</span>
<a name="line-90"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>nmaster</span> <span class='hs-varid'>r1</span> <span class='hs-varop'>++</span> <span class='hs-varid'>splitVertically</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-varid'>nmaster</span><span class='hs-layout'>)</span> <span class='hs-varid'>r2</span> <span class='hs-comment'>-- two columns</span>
<a name="line-91"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span><span class='hs-layout'>,</span><span class='hs-varid'>r2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitHorizontallyBy</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span>
<a name="line-92"></a>
<a name="line-93"></a><a name="splitVertically"></a><span class='hs-comment'>--</span>
<a name="line-94"></a><span class='hs-comment'>-- Divide the screen vertically into n subrectangles</span>
<a name="line-95"></a><span class='hs-comment'>--</span>
<a name="line-96"></a><span class='hs-definition'>splitVertically</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitHorizontally</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Rectangle</span><span class='hs-keyglyph'>]</span>
<a name="line-97"></a><span class='hs-definition'>splitVertically</span> <span class='hs-varid'>n</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>2</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>r</span><span class='hs-keyglyph'>]</span>
<a name="line-98"></a><span class='hs-definition'>splitVertically</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>sw</span> <span class='hs-varid'>sh</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Rectangle</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>sw</span> <span class='hs-varid'>smallh</span> <span class='hs-conop'>:</span>
<a name="line-99"></a> <span class='hs-varid'>splitVertically</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>sx</span> <span class='hs-layout'>(</span><span class='hs-varid'>sy</span><span class='hs-varop'>+</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>smallh</span><span class='hs-layout'>)</span> <span class='hs-varid'>sw</span> <span class='hs-layout'>(</span><span class='hs-varid'>sh</span><span class='hs-comment'>-</span><span class='hs-varid'>smallh</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>smallh</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sh</span> <span class='hs-varop'>`div`</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span> <span class='hs-comment'>--hmm, this is a fold or map.</span>
<a name="line-101"></a>
<a name="line-102"></a><a name="splitHorizontally"></a><span class='hs-comment'>-- Not used in the core, but exported</span>
<a name="line-103"></a><span class='hs-definition'>splitHorizontally</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>mirrorRect</span> <span class='hs-varop'>.</span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>n</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mirrorRect</span>
<a name="line-104"></a>
<a name="line-105"></a><a name="splitHorizontallyBy"></a><span class='hs-comment'>-- Divide the screen into two rectangles, using a rational to specify the ratio</span>
<a name="line-106"></a><span class='hs-definition'>splitHorizontallyBy</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitVerticallyBy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RealFrac</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span><span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span><span class='hs-layout'>)</span>
<a name="line-107"></a><span class='hs-definition'>splitHorizontallyBy</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>sw</span> <span class='hs-varid'>sh</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-108"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>Rectangle</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>leftw</span> <span class='hs-varid'>sh</span>
<a name="line-109"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>sx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>leftw</span><span class='hs-layout'>)</span> <span class='hs-varid'>sy</span> <span class='hs-layout'>(</span><span class='hs-varid'>sw</span><span class='hs-comment'>-</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>leftw</span><span class='hs-layout'>)</span> <span class='hs-varid'>sh</span><span class='hs-layout'>)</span>
<a name="line-110"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>leftw</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>floor</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>sw</span> <span class='hs-varop'>*</span> <span class='hs-varid'>f</span>
<a name="line-111"></a>
<a name="line-112"></a><a name="splitVerticallyBy"></a><span class='hs-comment'>-- Not used in the core, but exported</span>
<a name="line-113"></a><span class='hs-definition'>splitVerticallyBy</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>mirrorRect</span> <span class='hs-varop'>***</span> <span class='hs-varid'>mirrorRect</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>splitHorizontallyBy</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mirrorRect</span>
<a name="line-114"></a>
<a name="line-115"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-116"></a>
<a name="line-117"></a><a name="Mirror"></a><span class='hs-comment'>-- | Mirror a layout, compute its 90 degree rotated form.</span>
<a name="line-118"></a><a name="Mirror"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Mirror</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Mirror</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</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-119"></a>
<a name="line-120"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LayoutClass</span> <span class='hs-layout'>(</span><span class='hs-conid'>Mirror</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-121"></a> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-conid'>Mirror</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>second</span> <span class='hs-varid'>mirrorRect</span><span class='hs-layout'>)</span> <span class='hs-varop'>***</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Mirror</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-varid'>l</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>mirrorRect</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-123"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-layout'>(</span><span class='hs-conid'>Mirror</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-conid'>Mirror</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>l</span>
<a name="line-124"></a> <span class='hs-varid'>description</span> <span class='hs-layout'>(</span><span class='hs-conid'>Mirror</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Mirror "</span><span class='hs-varop'>++</span> <span class='hs-varid'>description</span> <span class='hs-varid'>l</span>
<a name="line-125"></a>
<a name="line-126"></a><a name="mirrorRect"></a><span class='hs-comment'>-- | Mirror a rectangle.</span>
<a name="line-127"></a><span class='hs-definition'>mirrorRect</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span>
<a name="line-128"></a><span class='hs-definition'>mirrorRect</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>rx</span> <span class='hs-varid'>ry</span> <span class='hs-varid'>rw</span> <span class='hs-varid'>rh</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>ry</span> <span class='hs-varid'>rx</span> <span class='hs-varid'>rh</span> <span class='hs-varid'>rw</span><span class='hs-layout'>)</span>
<a name="line-129"></a>
<a name="line-130"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-131"></a><span class='hs-comment'>-- LayoutClass selection manager</span>
<a name="line-132"></a><span class='hs-comment'>-- Layouts that transition between other layouts</span>
<a name="line-133"></a>
<a name="line-134"></a><a name="ChangeLayout"></a><span class='hs-comment'>-- | Messages to change the current layout.</span>
<a name="line-135"></a><a name="ChangeLayout"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ChangeLayout</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FirstLayout</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>NextLayout</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-136"></a>
<a name="line-137"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Message</span> <span class='hs-conid'>ChangeLayout</span>
<a name="line-138"></a>
<a name="line-139"></a><a name="|||"></a><span class='hs-comment'>-- | The layout choice combinator</span>
<a name="line-140"></a><span class='hs-layout'>(</span><span class='hs-varop'>|||</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <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-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Choose</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span>
<a name="line-141"></a><span class='hs-layout'>(</span><span class='hs-varop'>|||</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Choose</span> <span class='hs-conid'>L</span>
<a name="line-142"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>5</span> <span class='hs-varop'>|||</span>
<a name="line-143"></a>
<a name="line-144"></a><a name="Choose"></a><span class='hs-comment'>-- | A layout that allows users to switch between various layout options.</span>
<a name="line-145"></a><a name="Choose"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Choose</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Choose</span> <span class='hs-conid'>LR</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>a</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-146"></a>
<a name="line-147"></a><a name="LR"></a><span class='hs-comment'>-- | Are we on the left or right sub-layout?</span>
<a name="line-148"></a><a name="LR"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>LR</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>R</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> <span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-149"></a>
<a name="line-150"></a><a name="NextNoWrap"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>NextNoWrap</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NextNoWrap</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-151"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Message</span> <span class='hs-conid'>NextNoWrap</span>
<a name="line-152"></a>
<a name="line-153"></a><a name="handle"></a><span class='hs-comment'>-- | A small wrapper around handleMessage, as it is tedious to write</span>
<a name="line-154"></a><span class='hs-comment'>-- SomeMessage repeatedly.</span>
<a name="line-155"></a><span class='hs-definition'>handle</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Message</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <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-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-156"></a><span class='hs-definition'>handle</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-157"></a>
<a name="line-158"></a><a name="choose"></a><span class='hs-comment'>-- | A smart constructor that takes some potential modifications, returns a</span>
<a name="line-159"></a><span class='hs-comment'>-- new structure if any fields have changed, and performs any necessary cleanup</span>
<a name="line-160"></a><span class='hs-comment'>-- on newly non-visible layouts.</span>
<a name="line-161"></a><span class='hs-definition'>choose</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-162"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Choose</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>-></span> <span class='hs-conid'>LR</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-163"></a><span class='hs-definition'>choose</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>d'</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-varid'>d'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-164"></a><span class='hs-definition'>choose</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-varid'>d</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>d'</span> <span class='hs-varid'>ml</span> <span class='hs-varid'>mr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>lr</span>
<a name="line-165"></a> <span class='hs-keyword'>where</span>
<a name="line-166"></a> <span class='hs-layout'>(</span><span class='hs-varid'>l'</span><span class='hs-layout'>,</span> <span class='hs-varid'>r'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMaybe</span> <span class='hs-varid'>l</span> <span class='hs-varid'>ml</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-varid'>r</span> <span class='hs-varid'>mr</span><span class='hs-layout'>)</span>
<a name="line-167"></a> <span class='hs-varid'>lr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>d'</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-168"></a> <span class='hs-layout'>(</span><span class='hs-conid'>L</span><span class='hs-layout'>,</span> <span class='hs-conid'>R</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>hide</span> <span class='hs-varid'>l'</span> <span class='hs-layout'>,</span> <span class='hs-varid'>return</span> <span class='hs-varid'>r'</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <span class='hs-layout'>(</span><span class='hs-conid'>R</span><span class='hs-layout'>,</span> <span class='hs-conid'>L</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>l'</span><span class='hs-layout'>,</span> <span class='hs-varid'>hide</span> <span class='hs-varid'>r'</span> <span class='hs-layout'>)</span>
<a name="line-170"></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-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>l'</span><span class='hs-layout'>,</span> <span class='hs-varid'>return</span> <span class='hs-varid'>r'</span><span class='hs-layout'>)</span>
<a name="line-171"></a> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM2</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-varid'>d'</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-172"></a> <span class='hs-varid'>hide</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMaybe</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>handle</span> <span class='hs-varid'>x</span> <span class='hs-conid'>Hide</span>
<a name="line-173"></a>
<a name="line-174"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LayoutClass</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-175"></a> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-conid'>L</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-176"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>second</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span> <span class='hs-varop'>$</span> <span class='hs-varid'>flip</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-conid'>L</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-varid'>l</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span>
<a name="line-177"></a> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-conid'>R</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-178"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>second</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Choose</span> <span class='hs-conid'>R</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-varid'>r</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span>
<a name="line-179"></a>
<a name="line-180"></a> <span class='hs-varid'>description</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-conid'>L</span> <span class='hs-varid'>l</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>description</span> <span class='hs-varid'>l</span>
<a name="line-181"></a> <span class='hs-varid'>description</span> <span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-conid'>R</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>description</span> <span class='hs-varid'>r</span>
<a name="line-182"></a>
<a name="line-183"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lr</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>NextLayout</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-184"></a> <span class='hs-varid'>mlr'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handle</span> <span class='hs-varid'>lr</span> <span class='hs-conid'>NextNoWrap</span>
<a name="line-185"></a> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>handle</span> <span class='hs-varid'>lr</span> <span class='hs-conid'>FirstLayout</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Just</span><span class='hs-layout'>)</span> <span class='hs-varid'>mlr'</span>
<a name="line-186"></a>
<a name="line-187"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>c</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-varid'>d</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>NextNoWrap</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-188"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>of</span>
<a name="line-189"></a> <span class='hs-conid'>L</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-190"></a> <span class='hs-varid'>ml</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handle</span> <span class='hs-varid'>l</span> <span class='hs-conid'>NextNoWrap</span>
<a name="line-191"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>ml</span> <span class='hs-keyword'>of</span>
<a name="line-192"></a> <span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>choose</span> <span class='hs-varid'>c</span> <span class='hs-conid'>L</span> <span class='hs-varid'>ml</span> <span class='hs-conid'>Nothing</span>
<a name="line-193"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>choose</span> <span class='hs-varid'>c</span> <span class='hs-conid'>R</span> <span class='hs-conid'>Nothing</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>handle</span> <span class='hs-varid'>r</span> <span class='hs-conid'>FirstLayout</span>
<a name="line-194"></a>
<a name="line-195"></a> <span class='hs-conid'>R</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>choose</span> <span class='hs-varid'>c</span> <span class='hs-conid'>R</span> <span class='hs-conid'>Nothing</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>handle</span> <span class='hs-varid'>r</span> <span class='hs-conid'>NextNoWrap</span>
<a name="line-196"></a>
<a name="line-197"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>c</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>l</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-conid'>Just</span> <span class='hs-conid'>FirstLayout</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-198"></a> <span class='hs-varid'>flip</span> <span class='hs-layout'>(</span><span class='hs-varid'>choose</span> <span class='hs-varid'>c</span> <span class='hs-conid'>L</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>handle</span> <span class='hs-varid'>l</span> <span class='hs-conid'>FirstLayout</span>
<a name="line-199"></a>
<a name="line-200"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>c</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-varid'>d</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>ReleaseResources</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-201"></a> <span class='hs-varid'>join</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM2</span> <span class='hs-layout'>(</span><span class='hs-varid'>choose</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>handle</span> <span class='hs-varid'>l</span> <span class='hs-conid'>ReleaseResources</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>handle</span> <span class='hs-varid'>r</span> <span class='hs-conid'>ReleaseResources</span><span class='hs-layout'>)</span>
<a name="line-202"></a>
<a name="line-203"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>c</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Choose</span> <span class='hs-varid'>d</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-204"></a> <span class='hs-varid'>ml'</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>of</span>
<a name="line-205"></a> <span class='hs-conid'>L</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-206"></a> <span class='hs-conid'>R</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-207"></a> <span class='hs-varid'>mr'</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>of</span>
<a name="line-208"></a> <span class='hs-conid'>L</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-209"></a> <span class='hs-conid'>R</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span>
<a name="line-210"></a> <span class='hs-varid'>choose</span> <span class='hs-varid'>c</span> <span class='hs-varid'>d</span> <span class='hs-varid'>ml'</span> <span class='hs-varid'>mr'</span>
</pre></body>
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