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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE TypeSynonymInstances, FlexibleContexts, FlexibleInstances, MultiParamTypeClasses, UndecidableInstances, PatternGuards, DeriveDataTypeable, ScopedTypeVariables #-}</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.LayoutBuilderP</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) 2009 Anders Engstrom <ankaan@gmail.com>, 2011 Ilya Portnov <portnov84@rambler.ru></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 : Ilya Portnov <portnov84@rambler.ru></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : unportable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- A layout combinator that sends windows matching given predicate to one rectangle</span>
<a name="line-13"></a><span class='hs-comment'>-- and the rest to another.</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-16"></a>
<a name="line-17"></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'>LayoutBuilderP</span> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-conid'>LayoutP</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-19"></a> <span class='hs-varid'>layoutP</span><span class='hs-layout'>,</span> <span class='hs-varid'>layoutAll</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>relBox</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>absBox</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-comment'>-- * Overloading ways to select windows</span>
<a name="line-22"></a> <span class='hs-comment'>-- $selectWin</span>
<a name="line-23"></a> <span class='hs-conid'>Predicate</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'>Proxy</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-25"></a>
<a name="line-26"></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-27"></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'>isJust</span><span class='hs-layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-30"></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-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span><span class='hs-varop'>.</span><span class='hs-conid'>WindowProperties</span>
<a name="line-32"></a>
<a name="line-33"></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'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>LayoutBuilder</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-comment'>-- $selectWin</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- 'Predicate' exists because layouts are required to be serializable, and</span>
<a name="line-38"></a><span class='hs-comment'>-- "XMonad.Util.WindowProperties" is not sufficient (for example it does not</span>
<a name="line-39"></a><span class='hs-comment'>-- allow using regular expressions).</span>
<a name="line-40"></a><span class='hs-comment'>--</span>
<a name="line-41"></a><span class='hs-comment'>-- compare "XMonad.Util.Invisible"</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="Predicate"></a><span class='hs-comment'>-- | Type class for predicates. This enables us to manage not only Windows,</span>
<a name="line-44"></a><a name="Predicate"></a><span class='hs-comment'>-- but any objects, for which instance Predicate is defined.</span>
<a name="line-45"></a><a name="Predicate"></a><span class='hs-comment'>--</span>
<a name="line-46"></a><a name="Predicate"></a><span class='hs-comment'>-- Another instance exists in XMonad.Util.WindowPropertiesRE in xmonad-extras</span>
<a name="line-47"></a><a name="Predicate"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>w</span> <span class='hs-keyword'>where</span>
<a name="line-48"></a> <span class='hs-varid'>alwaysTrue</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>p</span> <span class='hs-comment'>-- ^ A predicate that is always True.</span>
<a name="line-49"></a> <span class='hs-varid'>checkPredicate</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- ^ Check if given object (window or smth else) matches that predicate</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="Proxy"></a><span class='hs-comment'>-- | Contains no actual data, but is needed to help select the correct instance</span>
<a name="line-52"></a><a name="Proxy"></a><span class='hs-comment'>-- of 'Predicate'</span>
<a name="line-53"></a><a name="Proxy"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Proxy</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="LayoutP"></a><span class='hs-comment'>-- | Data type for our layout.</span>
<a name="line-56"></a><a name="LayoutP"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-57"></a> <span class='hs-conid'>LayoutP</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>p</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>SubBox</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>SubBox</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l1</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-58"></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-59"></a>
<a name="line-60"></a><a name="layoutP"></a><span class='hs-comment'>-- | Use the specified layout in the described area windows that match given predicate and send the rest of the windows to the next layout in the chain.</span>
<a name="line-61"></a><span class='hs-comment'>-- It is possible to supply an alternative area that will then be used instead, if there are no windows to send to the next layout.</span>
<a name="line-62"></a><span class='hs-definition'>layoutP</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span> <span class='hs-varid'>a</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'>LayoutClass</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l3</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-63"></a> <span class='hs-varid'>p</span>
<a name="line-64"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>SubBox</span> <span class='hs-comment'>-- ^ The box to place the windows in</span>
<a name="line-65"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>SubBox</span> <span class='hs-comment'>-- ^ Possibly an alternative box that is used when this layout handles all windows that are left</span>
<a name="line-66"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ The layout to use in the specified area</span>
<a name="line-67"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>l3</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ Where to send the remaining windows</span>
<a name="line-68"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>l3</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ The resulting layout</span>
<a name="line-69"></a><span class='hs-definition'>layoutP</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>next</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LayoutP</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span>
<a name="line-70"></a>
<a name="line-71"></a><a name="layoutAll"></a><span class='hs-comment'>-- | Use the specified layout in the described area for all remaining windows.</span>
<a name="line-72"></a><span class='hs-definition'>layoutAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span> <span class='hs-varid'>a</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'>LayoutClass</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-73"></a> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>SubBox</span> <span class='hs-comment'>-- ^ The box to place the windows in</span>
<a name="line-74"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ The layout to use in the specified area</span>
<a name="line-75"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-conid'>Full</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ The resulting layout</span>
<a name="line-76"></a><span class='hs-definition'>layoutAll</span> <span class='hs-varid'>box</span> <span class='hs-varid'>sub</span> <span class='hs-keyglyph'>=</span>
<a name="line-77"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>alwaysTrue</span> <span class='hs-layout'>(</span><span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-78"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>LayoutP</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>a</span> <span class='hs-varid'>box</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>sub</span> <span class='hs-conid'>Nothing</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="instance%20LayoutClass%20(LayoutP%20p%20l1%20l2)%20w"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-81"></a> <span class='hs-conid'>LayoutClass</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span> <span class='hs-keyword'>where</span>
<a name="line-82"></a>
<a name="line-83"></a> <span class='hs-comment'>-- | Update window locations.</span>
<a name="line-84"></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-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>rect</span>
<a name="line-85"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>subs</span><span class='hs-layout'>,</span><span class='hs-varid'>nexts</span><span class='hs-layout'>,</span><span class='hs-varid'>subf'</span><span class='hs-layout'>,</span><span class='hs-varid'>nextf'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>splitStack</span> <span class='hs-varid'>s</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span>
<a name="line-86"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>selBox</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>nextf'</span>
<a name="line-87"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>box</span>
<a name="line-88"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>box</span> <span class='hs-varid'>id</span> <span class='hs-varid'>mbox</span>
<a name="line-89"></a>
<a name="line-90"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sublist</span><span class='hs-layout'>,</span><span class='hs-varid'>sub'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handle</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>subs</span> <span class='hs-varop'>$</span> <span class='hs-varid'>calcArea</span> <span class='hs-varid'>selBox</span> <span class='hs-varid'>rect</span>
<a name="line-91"></a>
<a name="line-92"></a> <span class='hs-layout'>(</span><span class='hs-varid'>nextlist</span><span class='hs-layout'>,</span><span class='hs-varid'>next'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-keyword'>of</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-93"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>res</span><span class='hs-layout'>,</span><span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handle</span> <span class='hs-varid'>n</span> <span class='hs-varid'>nexts</span> <span class='hs-varid'>rect</span>
<a name="line-94"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>res</span><span class='hs-layout'>,</span><span class='hs-conid'>Just</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-95"></a>
<a name="line-96"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>sublist</span><span class='hs-varop'>++</span><span class='hs-varid'>nextlist</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf'</span> <span class='hs-varid'>nextf'</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-varid'>sub'</span> <span class='hs-varid'>next'</span> <span class='hs-layout'>)</span>
<a name="line-97"></a> <span class='hs-keyword'>where</span>
<a name="line-98"></a> <span class='hs-varid'>handle</span> <span class='hs-varid'>l</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>res</span><span class='hs-layout'>,</span><span class='hs-varid'>ml</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Workspace</span> <span class='hs-str'>""</span> <span class='hs-varid'>l</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-99"></a> <span class='hs-varid'>l'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>l</span> <span class='hs-varid'>id</span> <span class='hs-varid'>ml</span>
<a name="line-100"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>res</span><span class='hs-layout'>,</span><span class='hs-varid'>l'</span><span class='hs-layout'>)</span>
<a name="line-101"></a>
<a name="line-102"></a> <span class='hs-comment'>-- | Propagate messages.</span>
<a name="line-103"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-104"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>IncMasterN</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</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-varid'>sendFocus</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-105"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Shrink</span><span class='hs-layout'>)</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-varid'>sendFocus</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-106"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Expand</span><span class='hs-layout'>)</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-varid'>sendFocus</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-107"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sendBoth</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-108"></a>
<a name="line-109"></a> <span class='hs-comment'>-- | Descriptive name for layout.</span>
<a name="line-110"></a> <span class='hs-varid'>description</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"layoutP "</span><span class='hs-varop'>++</span> <span class='hs-varid'>description</span> <span class='hs-varid'>sub</span> <span class='hs-varop'>++</span><span class='hs-str'>" "</span><span class='hs-varop'>++</span> <span class='hs-varid'>description</span> <span class='hs-varid'>next</span>
<a name="line-111"></a> <span class='hs-varid'>description</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>sub</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"layoutP "</span><span class='hs-varop'>++</span> <span class='hs-varid'>description</span> <span class='hs-varid'>sub</span>
<a name="line-112"></a>
<a name="line-113"></a>
<a name="line-114"></a><a name="sendSub"></a><span class='hs-definition'>sendSub</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>a</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'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-115"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SomeMessage</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'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-116"></a><span class='hs-definition'>sendSub</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-117"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>sub'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>m</span>
<a name="line-118"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>sub'</span>
<a name="line-119"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-layout'>(</span><span class='hs-varid'>maybe</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>id</span> <span class='hs-varid'>sub'</span><span class='hs-layout'>)</span> <span class='hs-varid'>next</span>
<a name="line-120"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Nothing</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="sendBoth"></a><span class='hs-definition'>sendBoth</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>a</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'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-123"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SomeMessage</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'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-124"></a><span class='hs-definition'>sendBoth</span> <span class='hs-varid'>l</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sendSub</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-125"></a><span class='hs-definition'>sendBoth</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-126"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>sub'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>m</span>
<a name="line-127"></a> <span class='hs-varid'>next'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>next</span> <span class='hs-varid'>m</span>
<a name="line-128"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>sub'</span> <span class='hs-varop'>||</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>next'</span>
<a name="line-129"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-layout'>(</span><span class='hs-varid'>maybe</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>id</span> <span class='hs-varid'>sub'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>next</span> <span class='hs-varid'>id</span> <span class='hs-varid'>next'</span><span class='hs-layout'>)</span>
<a name="line-130"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Nothing</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="sendNext"></a><span class='hs-definition'>sendNext</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>a</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'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-133"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SomeMessage</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'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-134"></a><span class='hs-definition'>sendNext</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-135"></a><span class='hs-definition'>sendNext</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-varid'>sub</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-136"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>next'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>next</span> <span class='hs-varid'>m</span>
<a name="line-137"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isJust</span> <span class='hs-varid'>next'</span>
<a name="line-138"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>box</span> <span class='hs-varid'>mbox</span> <span class='hs-varid'>sub</span> <span class='hs-varid'>next'</span>
<a name="line-139"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Nothing</span>
<a name="line-140"></a>
<a name="line-141"></a><a name="sendFocus"></a><span class='hs-definition'>sendFocus</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>a</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'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-142"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SomeMessage</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'>LayoutP</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-143"></a><span class='hs-definition'>sendFocus</span> <span class='hs-varid'>l</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>LayoutP</span> <span class='hs-varid'>subf</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</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'>do</span> <span class='hs-varid'>foc</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>isFocus</span> <span class='hs-varid'>subf</span>
<a name="line-144"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>foc</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>sendSub</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-145"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>sendNext</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
<a name="line-146"></a>
<a name="line-147"></a><a name="isFocus"></a><span class='hs-definition'>isFocus</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</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-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>Bool</span>
<a name="line-148"></a><span class='hs-definition'>isFocus</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-149"></a><span class='hs-definition'>isFocus</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>ms</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>stack</span> <span class='hs-varop'>.</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>workspace</span> <span class='hs-varop'>.</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>current</span><span class='hs-layout'>)</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>gets</span> <span class='hs-varid'>windowset</span>
<a name="line-150"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>maybe</span> <span class='hs-conid'>False</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-varid'>show</span> <span class='hs-varid'>w</span> <span class='hs-varop'>==</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>focus</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>ms</span>
<a name="line-151"></a>
<a name="line-152"></a>
<a name="line-153"></a><a name="splitBy"></a><span class='hs-comment'>-- | Split given list of objects (i.e. windows) using predicate.</span>
<a name="line-154"></a><span class='hs-definition'>splitBy</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>w</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>w</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>w</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-155"></a><span class='hs-definition'>splitBy</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>ws</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldM</span> <span class='hs-varid'>step</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>ws</span>
<a name="line-156"></a> <span class='hs-keyword'>where</span>
<a name="line-157"></a> <span class='hs-varid'>step</span> <span class='hs-layout'>(</span><span class='hs-varid'>good</span><span class='hs-layout'>,</span> <span class='hs-varid'>bad</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-158"></a> <span class='hs-varid'>ok</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPredicate</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>w</span>
<a name="line-159"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>ok</span>
<a name="line-160"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-conop'>:</span><span class='hs-varid'>good</span><span class='hs-layout'>,</span> <span class='hs-varid'>bad</span><span class='hs-layout'>)</span>
<a name="line-161"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-varid'>good</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-conop'>:</span><span class='hs-varid'>bad</span><span class='hs-layout'>)</span>
<a name="line-162"></a>
<a name="line-163"></a><a name="splitStack"></a><span class='hs-definition'>splitStack</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Predicate</span> <span class='hs-varid'>p</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>w</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-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>w</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'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-164"></a><span class='hs-definition'>splitStack</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-165"></a><span class='hs-definition'>splitStack</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>subf</span> <span class='hs-varid'>nextf</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-166"></a> <span class='hs-keyword'>let</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-167"></a> <span class='hs-layout'>(</span><span class='hs-varid'>good</span><span class='hs-layout'>,</span> <span class='hs-varid'>other</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>splitBy</span> <span class='hs-varid'>prop</span> <span class='hs-varid'>ws</span>
<a name="line-168"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>subf'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foc</span> <span class='hs-varid'>good</span> <span class='hs-varid'>subf</span>
<a name="line-169"></a> <span class='hs-varid'>nextf'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foc</span> <span class='hs-varid'>other</span> <span class='hs-varid'>nextf</span>
<a name="line-170"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span> <span class='hs-varid'>differentiate'</span> <span class='hs-varid'>subf'</span> <span class='hs-varid'>good</span>
<a name="line-171"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>differentiate'</span> <span class='hs-varid'>nextf'</span> <span class='hs-varid'>other</span>
<a name="line-172"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>subf'</span>
<a name="line-173"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>nextf'</span>
<a name="line-174"></a> <span class='hs-layout'>)</span>
<a name="line-175"></a> <span class='hs-keyword'>where</span>
<a name="line-176"></a> <span class='hs-varid'>foc</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-177"></a> <span class='hs-varid'>foc</span> <span class='hs-varid'>l</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>focus</span> <span class='hs-varid'>s</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>l</span>
<a name="line-178"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>focus</span> <span class='hs-varid'>s</span>
<a name="line-179"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>maybe</span> <span class='hs-conid'>False</span> <span class='hs-layout'>(</span><span class='hs-varop'>`elem`</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span>
<a name="line-180"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>f</span>
<a name="line-181"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>head</span> <span class='hs-varid'>l</span>
<a name="line-182"></a>
<a name="line-183"></a><a name="calcArea"></a><span class='hs-definition'>calcArea</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>SubBox</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-184"></a><span class='hs-definition'>calcArea</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>SubBox</span> <span class='hs-varid'>xpos</span> <span class='hs-varid'>ypos</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span><span class='hs-layout'>)</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'>rect_x</span> <span class='hs-varid'>rect</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>xpos'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>rect_y</span> <span class='hs-varid'>rect</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>ypos'</span><span class='hs-layout'>)</span> <span class='hs-varid'>width'</span> <span class='hs-varid'>height'</span>
<a name="line-185"></a> <span class='hs-keyword'>where</span>
<a name="line-186"></a> <span class='hs-varid'>xpos'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>calc</span> <span class='hs-conid'>False</span> <span class='hs-varid'>xpos</span> <span class='hs-varop'>$</span> <span class='hs-varid'>rect_width</span> <span class='hs-varid'>rect</span>
<a name="line-187"></a> <span class='hs-varid'>ypos'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>calc</span> <span class='hs-conid'>False</span> <span class='hs-varid'>ypos</span> <span class='hs-varop'>$</span> <span class='hs-varid'>rect_height</span> <span class='hs-varid'>rect</span>
<a name="line-188"></a> <span class='hs-varid'>width'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>calc</span> <span class='hs-conid'>True</span> <span class='hs-varid'>width</span> <span class='hs-varop'>$</span> <span class='hs-varid'>rect_width</span> <span class='hs-varid'>rect</span> <span class='hs-comment'>-</span> <span class='hs-varid'>xpos'</span>
<a name="line-189"></a> <span class='hs-varid'>height'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>calc</span> <span class='hs-conid'>True</span> <span class='hs-varid'>height</span> <span class='hs-varop'>$</span> <span class='hs-varid'>rect_height</span> <span class='hs-varid'>rect</span> <span class='hs-comment'>-</span> <span class='hs-varid'>ypos'</span>
<a name="line-190"></a>
<a name="line-191"></a> <span class='hs-varid'>calc</span> <span class='hs-varid'>zneg</span> <span class='hs-varid'>val</span> <span class='hs-varid'>tot</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>min</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>tot</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span>
<a name="line-192"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>val</span> <span class='hs-keyword'>of</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>Rel</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>floor</span> <span class='hs-varop'>$</span> <span class='hs-varid'>v</span> <span class='hs-varop'>*</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>tot</span>
<a name="line-193"></a> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>Abs</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>if</span> <span class='hs-varid'>v</span><span class='hs-varop'><</span><span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-layout'>(</span><span class='hs-varid'>zneg</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>v</span><span class='hs-varop'>==</span><span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-194"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>tot</span><span class='hs-layout'>)</span><span class='hs-varop'>+</span><span class='hs-varid'>v</span>
<a name="line-195"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>v</span>
<a name="line-196"></a>
<a name="line-197"></a><a name="differentiate'"></a><span class='hs-definition'>differentiate'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>q</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span>
<a name="line-198"></a><span class='hs-definition'>differentiate'</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-199"></a><span class='hs-definition'>differentiate'</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>differentiate</span> <span class='hs-varid'>w</span>
<a name="line-200"></a><span class='hs-definition'>differentiate'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span>
<a name="line-201"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>f</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-layout'>{</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>focus</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span>
<a name="line-202"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>up</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>$</span> <span class='hs-varid'>takeWhile</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span>
<a name="line-203"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>down</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tail</span> <span class='hs-varop'>$</span> <span class='hs-varid'>dropWhile</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span>
<a name="line-204"></a> <span class='hs-layout'>}</span>
<a name="line-205"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>differentiate</span> <span class='hs-varid'>w</span>
<a name="line-206"></a>
<a name="line-207"></a><a name="instance%20Predicate%20Property%20Window"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Predicate</span> <span class='hs-conid'>Property</span> <span class='hs-conid'>Window</span> <span class='hs-keyword'>where</span>
<a name="line-208"></a> <span class='hs-varid'>alwaysTrue</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Const</span> <span class='hs-conid'>True</span>
<a name="line-209"></a> <span class='hs-varid'>checkPredicate</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hasProperty</span>
<a name="line-210"></a>
</pre></body>
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