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<title>XMonad/Layout/TwoPane.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}</span>
<a name="line-2"></a>
<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.TwoPane</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) Spencer Janssen <spencerjanssen@gmail.com></span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD3-style (see LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : Spencer Janssen <spencerjanssen@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'>-- A layout that splits the screen horizontally and shows two windows. The</span>
<a name="line-14"></a><span class='hs-comment'>-- left window is always the master window, and the right is either the</span>
<a name="line-15"></a><span class='hs-comment'>-- currently focused window or the second window in layout order.</span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-18"></a>
<a name="line-19"></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'>TwoPane</span> <span class='hs-layout'>(</span>
<a name="line-20"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-21"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-22"></a> <span class='hs-conid'>TwoPane</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-23"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>focus</span><span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>StackSet</span> <span class='hs-layout'>(</span> <span class='hs-varid'>focus</span><span class='hs-layout'>,</span> <span class='hs-varid'>up</span><span class='hs-layout'>,</span> <span class='hs-varid'>down</span><span class='hs-layout'>)</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-comment'>-- $usage</span>
<a name="line-29"></a><span class='hs-comment'>-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:</span>
<a name="line-30"></a><span class='hs-comment'>--</span>
<a name="line-31"></a><span class='hs-comment'>-- > import XMonad.Layout.TwoPane</span>
<a name="line-32"></a><span class='hs-comment'>--</span>
<a name="line-33"></a><span class='hs-comment'>-- Then edit your @layoutHook@ by adding the TwoPane layout:</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>-- > myLayout = TwoPane (3/100) (1/2) ||| Full ||| etc..</span>
<a name="line-36"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myLayout }</span>
<a name="line-37"></a><span class='hs-comment'>--</span>
<a name="line-38"></a><span class='hs-comment'>-- For more detailed instructions on editing the layoutHook see:</span>
<a name="line-39"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><span class='hs-comment'>-- "XMonad.Doc.Extending#Editing_the_layout_hook"</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="TwoPane"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TwoPane</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-43"></a> <span class='hs-conid'>TwoPane</span> <span class='hs-conid'>Rational</span> <span class='hs-conid'>Rational</span>
<a name="line-44"></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-45"></a>
<a name="line-46"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-conid'>TwoPane</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-47"></a> <span class='hs-varid'>doLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>TwoPane</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>split</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'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>arrange</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-keyword'>where</span>
<a name="line-49"></a> <span class='hs-varid'>arrange</span> <span class='hs-varid'>rect</span> <span class='hs-varid'>st</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>up</span> <span class='hs-varid'>st</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-50"></a> <span class='hs-layout'>(</span><span class='hs-varid'>master</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>master</span><span class='hs-layout'>,</span><span class='hs-varid'>left</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>focus</span> <span class='hs-varid'>st</span><span class='hs-layout'>,</span><span class='hs-varid'>right</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-51"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>down</span> <span class='hs-varid'>st</span> <span class='hs-keyword'>of</span>
<a name="line-52"></a> <span class='hs-layout'>(</span><span class='hs-varid'>next</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>focus</span> <span class='hs-varid'>st</span><span class='hs-layout'>,</span><span class='hs-varid'>left</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>next</span><span class='hs-layout'>,</span><span class='hs-varid'>right</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-53"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>focus</span> <span class='hs-varid'>st</span><span class='hs-layout'>,</span> <span class='hs-varid'>rect</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-54"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>left</span><span class='hs-layout'>,</span> <span class='hs-varid'>right</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitHorizontallyBy</span> <span class='hs-varid'>split</span> <span class='hs-varid'>rect</span>
<a name="line-55"></a>
<a name="line-56"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-layout'>(</span><span class='hs-conid'>TwoPane</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>split</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span>
<a name="line-57"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-58"></a> <span class='hs-conid'>Just</span> <span class='hs-conid'>Shrink</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>TwoPane</span> <span class='hs-varid'>delta</span> <span class='hs-layout'>(</span><span class='hs-varid'>split</span> <span class='hs-comment'>-</span> <span class='hs-varid'>delta</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-conid'>Just</span> <span class='hs-conid'>Expand</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>TwoPane</span> <span class='hs-varid'>delta</span> <span class='hs-layout'>(</span><span class='hs-varid'>split</span> <span class='hs-varop'>+</span> <span class='hs-varid'>delta</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-61"></a>
<a name="line-62"></a> <span class='hs-varid'>description</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"TwoPane"</span>
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