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<title>XMonad/Layout/Master.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances, FlexibleContexts, PatternGuards #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : XMonad.Layout.Master</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) Ismael Carnales, Lukas Mai</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style (see LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : Ismael Carnales <icarnales@gmail.com></span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : unportable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- Layout modfier that adds a master window to another layout.</span>
<a name="line-14"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></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'>Master</span> <span class='hs-layout'>(</span>
<a name="line-17"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-18"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-19"></a>
<a name="line-20"></a> <span class='hs-varid'>mastered</span>
<a name="line-21"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>StackSet</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>LayoutModifier</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-comment'>-- $usage</span>
<a name="line-28"></a><span class='hs-comment'>-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:</span>
<a name="line-29"></a><span class='hs-comment'>--</span>
<a name="line-30"></a><span class='hs-comment'>-- > import XMonad.Layout.Master</span>
<a name="line-31"></a><span class='hs-comment'>--</span>
<a name="line-32"></a><span class='hs-comment'>-- Then edit your @layoutHook@ and add the Master modifier to the layout that</span>
<a name="line-33"></a><span class='hs-comment'>-- you prefer.</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>-- > mastered (1/100) (1/2) $ Grid</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- This will use the left half of your screen for a master window and let</span>
<a name="line-38"></a><span class='hs-comment'>-- Grid manage the right half.</span>
<a name="line-39"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><span class='hs-comment'>-- For more detailed instructions on editing the layoutHook see</span>
<a name="line-41"></a><span class='hs-comment'>-- "XMonad.Doc.Extending#Editing_the_layout_hook".</span>
<a name="line-42"></a><span class='hs-comment'>--</span>
<a name="line-43"></a><span class='hs-comment'>-- Like 'XMonad.Layout.Tall', 'withMaster' supports the</span>
<a name="line-44"></a><span class='hs-comment'>-- 'XMonad.Layout.Shrink' and XMonad.Layout.Expand' messages.</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="AddMaster"></a><span class='hs-comment'>-- | Data type for LayoutModifier which converts given layout to a mastered</span>
<a name="line-47"></a><a name="AddMaster"></a><span class='hs-comment'>-- layout</span>
<a name="line-48"></a><a name="AddMaster"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>AddMaster</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AddMaster</span> <span class='hs-conid'>Rational</span> <span class='hs-conid'>Rational</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><a name="mastered"></a><span class='hs-comment'>-- | Modifier which converts given layout to a mastered one</span>
<a name="line-51"></a><span class='hs-definition'>mastered</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-keyglyph'>=></span>
<a name="line-52"></a> <span class='hs-conid'>Rational</span> <span class='hs-comment'>-- ^ @delta@, the ratio of the screen to resize by</span>
<a name="line-53"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rational</span> <span class='hs-comment'>-- ^ @frac@, what portion of the screen to use for the master window</span>
<a name="line-54"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ the layout to be modified</span>
<a name="line-55"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>AddMaster</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-56"></a><span class='hs-definition'>mastered</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>frac</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-varop'>$</span> <span class='hs-conid'>AddMaster</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>frac</span>
<a name="line-57"></a>
<a name="line-58"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutModifier</span> <span class='hs-conid'>AddMaster</span> <span class='hs-conid'>Window</span> <span class='hs-keyword'>where</span>
<a name="line-59"></a> <span class='hs-varid'>modifyLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>AddMaster</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>frac</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>applyMaster</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>frac</span>
<a name="line-60"></a> <span class='hs-varid'>modifierDescription</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Mastered"</span>
<a name="line-61"></a>
<a name="line-62"></a> <span class='hs-varid'>pureMess</span> <span class='hs-layout'>(</span><span class='hs-conid'>AddMaster</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>frac</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-63"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>Shrink</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>AddMaster</span> <span class='hs-varid'>delta</span> <span class='hs-layout'>(</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-64"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>Expand</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-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>AddMaster</span> <span class='hs-varid'>delta</span> <span class='hs-layout'>(</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-65"></a>
<a name="line-66"></a> <span class='hs-varid'>pureMess</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="applyMaster"></a><span class='hs-comment'>-- | Internal function for adding a master window and let the modified</span>
<a name="line-69"></a><span class='hs-comment'>-- layout handle the rest of the windows</span>
<a name="line-70"></a><span class='hs-definition'>applyMaster</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-conid'>Window</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-71"></a> <span class='hs-conid'>Rational</span>
<a name="line-72"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rational</span>
<a name="line-73"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Workspace</span> <span class='hs-conid'>WorkspaceId</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-conid'>Window</span><span class='hs-layout'>)</span> <span class='hs-conid'>Window</span>
<a name="line-74"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span>
<a name="line-75"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Window</span><span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-conid'>Window</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-76"></a><span class='hs-definition'>applyMaster</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>frac</span> <span class='hs-varid'>wksp</span> <span class='hs-varid'>rect</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-77"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>st</span><span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>stack</span> <span class='hs-varid'>wksp</span>
<a name="line-78"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ws</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>integrate'</span> <span class='hs-varop'>$</span> <span class='hs-varid'>st</span>
<a name="line-79"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>length</span> <span class='hs-varid'>ws</span> <span class='hs-varop'>></span> <span class='hs-num'>1</span> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-80"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>head</span> <span class='hs-varid'>ws</span>
<a name="line-81"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>mr</span><span class='hs-layout'>,</span> <span class='hs-varid'>sr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitHorizontallyBy</span> <span class='hs-varid'>frac</span> <span class='hs-varid'>rect</span>
<a name="line-82"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>nst</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>st</span><span class='hs-varop'>>>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-varop'>/=</span><span class='hs-layout'>)</span>
<a name="line-83"></a> <span class='hs-varid'>wrs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-varid'>wksp</span> <span class='hs-layout'>{</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>stack</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>nst</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-varid'>sr</span>
<a name="line-84"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-varid'>mr</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>wrs</span><span class='hs-layout'>,</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>wrs</span><span class='hs-layout'>)</span>
<a name="line-85"></a>
<a name="line-86"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>runLayout</span> <span class='hs-varid'>wksp</span> <span class='hs-varid'>rect</span>
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