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<title>XMonad/Layout/CenteredMaster.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances #-}</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.CenteredMaster</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) 2009 Ilya Portnov</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see xmonad/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'>-- Two layout modifiers. centerMaster places master window at center,</span>
<a name="line-13"></a><span class='hs-comment'>-- on top of all other windows, which are managed by base layout.</span>
<a name="line-14"></a><span class='hs-comment'>-- topRightMaster is similar, but places master window in top right corner</span>
<a name="line-15"></a><span class='hs-comment'>-- instead of center.</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'>CenteredMaster</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>
<a name="line-23"></a> <span class='hs-varid'>centerMaster</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-varid'>topRightMaster</span>
<a name="line-25"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<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'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>LayoutModifier</span>
<a name="line-29"></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-30"></a>
<a name="line-31"></a><span class='hs-comment'>-- $usage</span>
<a name="line-32"></a><span class='hs-comment'>-- This module defines two new layout modifiers: centerMaster and topRightMaster.</span>
<a name="line-33"></a><span class='hs-comment'>-- centerMaster places master window at center of screen, on top of others.</span>
<a name="line-34"></a><span class='hs-comment'>-- All other windows in background are managed by base layout.</span>
<a name="line-35"></a><span class='hs-comment'>-- topRightMaster is like centerMaster, but places master window in top right corner instead of center.</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- Yo can use this module by adding folowing in your @xmonad.hs@:</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><span class='hs-comment'>-- > import XMonad.Layout.CenteredMaster</span>
<a name="line-40"></a><span class='hs-comment'>--</span>
<a name="line-41"></a><span class='hs-comment'>-- Then add layouts to your layoutHook:</span>
<a name="line-42"></a><span class='hs-comment'>--</span>
<a name="line-43"></a><span class='hs-comment'>-- > myLayoutHook = centerMaster Grid ||| ...</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="Positioner"></a><span class='hs-comment'>-- | Function that decides where master window should be placed</span>
<a name="line-46"></a><a name="Positioner"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Positioner</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-47"></a>
<a name="line-48"></a><a name="CenteredMaster"></a><span class='hs-comment'>-- | Data type for LayoutModifier</span>
<a name="line-49"></a><a name="CenteredMaster"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>CenteredMaster</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CenteredMaster</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-50"></a>
<a name="line-51"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutModifier</span> <span class='hs-conid'>CenteredMaster</span> <span class='hs-conid'>Window</span> <span class='hs-keyword'>where</span>
<a name="line-52"></a> <span class='hs-varid'>modifyLayout</span> <span class='hs-conid'>CenteredMaster</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>applyPosition</span> <span class='hs-layout'>(</span><span class='hs-varid'>center</span> <span class='hs-layout'>(</span><span class='hs-num'>5</span><span class='hs-varop'>/</span><span class='hs-num'>7</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-num'>5</span><span class='hs-varop'>/</span><span class='hs-num'>7</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="TopRightMaster"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TopRightMaster</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TopRightMaster</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-55"></a>
<a name="line-56"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutModifier</span> <span class='hs-conid'>TopRightMaster</span> <span class='hs-conid'>Window</span> <span class='hs-keyword'>where</span>
<a name="line-57"></a> <span class='hs-varid'>modifyLayout</span> <span class='hs-conid'>TopRightMaster</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>applyPosition</span> <span class='hs-layout'>(</span><span class='hs-varid'>topRight</span> <span class='hs-layout'>(</span><span class='hs-num'>3</span><span class='hs-varop'>/</span><span class='hs-num'>7</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-varop'>/</span><span class='hs-num'>2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="centerMaster"></a><span class='hs-comment'>-- | Modifier that puts master window in center, other windows in background</span>
<a name="line-60"></a><span class='hs-comment'>-- are managed by given layout</span>
<a name="line-61"></a><span class='hs-definition'>centerMaster</span> <span class='hs-keyglyph'>::</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-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>CenteredMaster</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-62"></a><span class='hs-definition'>centerMaster</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>CenteredMaster</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="topRightMaster"></a><span class='hs-comment'>-- | Modifier that puts master window in top right corner, other windows in background</span>
<a name="line-65"></a><span class='hs-comment'>-- are managed by given layout</span>
<a name="line-66"></a><span class='hs-definition'>topRightMaster</span> <span class='hs-keyglyph'>::</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-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>TopRightMaster</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-67"></a><span class='hs-definition'>topRightMaster</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>TopRightMaster</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="applyPosition"></a><span class='hs-comment'>-- | Internal function, doing main job</span>
<a name="line-70"></a><span class='hs-definition'>applyPosition</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'>Eq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-71"></a> <span class='hs-conid'>Positioner</span>
<a name="line-72"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</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-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-73"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span>
<a name="line-74"></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-varid'>a</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-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-75"></a>
<a name="line-76"></a><span class='hs-definition'>applyPosition</span> <span class='hs-varid'>pos</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'>stack</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>W</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'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>integrate'</span> <span class='hs-varop'>$</span> <span class='hs-varid'>stack</span>
<a name="line-79"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>ws</span> <span class='hs-keyword'>then</span>
<a name="line-80"></a> <span class='hs-varid'>runLayout</span> <span class='hs-varid'>wksp</span> <span class='hs-varid'>rect</span>
<a name="line-81"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-82"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>first</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>head</span> <span class='hs-varid'>ws</span>
<a name="line-83"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>other</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>ws</span>
<a name="line-84"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>filtStack</span> <span class='hs-keyglyph'>=</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'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>first</span> <span class='hs-varop'>/=</span><span class='hs-layout'>)</span>
<a name="line-85"></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'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>stack</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filtStack</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-varid'>rect</span>
<a name="line-86"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>first</span><span class='hs-layout'>,</span> <span class='hs-varid'>place</span> <span class='hs-varid'>pos</span> <span class='hs-varid'>other</span> <span class='hs-varid'>rect</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-87"></a>
<a name="line-88"></a><a name="place"></a><span class='hs-comment'>-- | Place master window (it's Rectangle is given), using the given Positioner.</span>
<a name="line-89"></a><span class='hs-comment'>-- If second argument is empty (that is, there is only one window on workspace),</span>
<a name="line-90"></a><span class='hs-comment'>-- place that window fullscreen.</span>
<a name="line-91"></a><span class='hs-definition'>place</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Positioner</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</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-92"></a><span class='hs-definition'>place</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>rect</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rect</span>
<a name="line-93"></a><span class='hs-definition'>place</span> <span class='hs-varid'>pos</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rect</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pos</span> <span class='hs-varid'>rect</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="topRight"></a><span class='hs-comment'>-- | Function that calculates Rectangle at top right corner of given Rectangle</span>
<a name="line-96"></a><span class='hs-definition'>topRight</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</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-97"></a><span class='hs-definition'>topRight</span> <span class='hs-varid'>rx</span> <span class='hs-varid'>ry</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'>x</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>w</span> <span class='hs-varid'>h</span>
<a name="line-98"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>round</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>sw</span> <span class='hs-varop'>*</span> <span class='hs-varid'>rx</span><span class='hs-layout'>)</span>
<a name="line-99"></a> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>round</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>sh</span> <span class='hs-varop'>*</span> <span class='hs-varid'>ry</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>sw</span><span class='hs-comment'>-</span><span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-101"></a>
<a name="line-102"></a><a name="center"></a><span class='hs-comment'>-- | Function that calculates Rectangle at center of given Rectangle.</span>
<a name="line-103"></a><span class='hs-definition'>center</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</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-104"></a><span class='hs-definition'>center</span> <span class='hs-varid'>rx</span> <span class='hs-varid'>ry</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'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>w</span> <span class='hs-varid'>h</span>
<a name="line-105"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>round</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>sw</span> <span class='hs-varop'>*</span> <span class='hs-varid'>rx</span><span class='hs-layout'>)</span>
<a name="line-106"></a> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>round</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>sh</span> <span class='hs-varop'>*</span> <span class='hs-varid'>ry</span><span class='hs-layout'>)</span>
<a name="line-107"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>sw</span><span class='hs-comment'>-</span><span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-varop'>`div`</span> <span class='hs-num'>2</span>
<a name="line-108"></a> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sy</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>sh</span><span class='hs-comment'>-</span><span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-varop'>`div`</span> <span class='hs-num'>2</span>
<a name="line-109"></a>
<a name="line-110"></a>
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