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<title>XMonad/Layout/Column.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.Column</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 : 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'>-- Provides Column layout that places all windows in one column. Windows</span>
<a name="line-13"></a><span class='hs-comment'>-- heights are calculated from equation: H1/H2 = H2/H3 = ... = q, where q is</span>
<a name="line-14"></a><span class='hs-comment'>-- given. With Shrink/Expand messages you can change the q value.</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>Column</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-20"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-21"></a> <span class='hs-conid'>Column</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-22"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<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'>W</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-comment'>-- $usage</span>
<a name="line-27"></a><span class='hs-comment'>-- This module defines layot named Column. It places all windows in one</span>
<a name="line-28"></a><span class='hs-comment'>-- column. Windows heights are calculated from equation: H1/H2 = H2/H3 = ... =</span>
<a name="line-29"></a><span class='hs-comment'>-- q, where `q' is given (thus, windows heights are members of geometric</span>
<a name="line-30"></a><span class='hs-comment'>-- progression). With Shrink/Expand messages one can change the `q' value.</span>
<a name="line-31"></a><span class='hs-comment'>--</span>
<a name="line-32"></a><span class='hs-comment'>-- You can use this module by adding folowing in your @xmonad.hs@:</span>
<a name="line-33"></a><span class='hs-comment'>--</span>
<a name="line-34"></a><span class='hs-comment'>-- > import XMonad.Layout.Column</span>
<a name="line-35"></a><span class='hs-comment'>--</span>
<a name="line-36"></a><span class='hs-comment'>-- Then add layouts to your layoutHook:</span>
<a name="line-37"></a><span class='hs-comment'>--</span>
<a name="line-38"></a><span class='hs-comment'>-- > myLayoutHook = Column 1.6 ||| ...</span>
<a name="line-39"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><span class='hs-comment'>-- In this example, each next window will have height 1.6 times less then</span>
<a name="line-41"></a><span class='hs-comment'>-- previous window.</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="Column"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Column</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Column</span> <span class='hs-conid'>Float</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-44"></a>
<a name="line-45"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-conid'>Column</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-46"></a> <span class='hs-varid'>pureLayout</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>columnLayout</span>
<a name="line-47"></a> <span class='hs-varid'>pureMessage</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>columnMessage</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="columnMessage"></a><span class='hs-definition'>columnMessage</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Column</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'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Column</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-50"></a><span class='hs-definition'>columnMessage</span> <span class='hs-layout'>(</span><span class='hs-conid'>Column</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>resize</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>resize</span> <span class='hs-conid'>Shrink</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Column</span> <span class='hs-layout'>(</span><span class='hs-varid'>q</span><span class='hs-comment'>-</span><span class='hs-num'>0.1</span><span class='hs-layout'>)</span>
<a name="line-52"></a> <span class='hs-varid'>resize</span> <span class='hs-conid'>Expand</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Column</span> <span class='hs-layout'>(</span><span class='hs-varid'>q</span><span class='hs-varop'>+</span><span class='hs-num'>0.1</span><span class='hs-layout'>)</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="columnLayout"></a><span class='hs-definition'>columnLayout</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Column</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></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>
<a name="line-55"></a><span class='hs-definition'>columnLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Column</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-varid'>rect</span> <span class='hs-varid'>stack</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zip</span> <span class='hs-varid'>ws</span> <span class='hs-varid'>rects</span>
<a name="line-56"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>ws</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>integrate</span> <span class='hs-varid'>stack</span>
<a name="line-57"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>ws</span>
<a name="line-58"></a> <span class='hs-varid'>heights</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>xn</span> <span class='hs-varid'>n</span> <span class='hs-varid'>rect</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>n</span><span class='hs-keyglyph'>]</span>
<a name="line-59"></a> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>sum</span> <span class='hs-varop'>$</span> <span class='hs-varid'>take</span> <span class='hs-varid'>k</span> <span class='hs-varid'>heights</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-60"></a> <span class='hs-varid'>rects</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>mkRect</span> <span class='hs-varid'>rect</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>zip</span> <span class='hs-varid'>heights</span> <span class='hs-varid'>ys</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="mkRect"></a><span class='hs-definition'>mkRect</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Dimension</span><span class='hs-layout'>,</span><span class='hs-conid'>Position</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span>
<a name="line-63"></a><span class='hs-definition'>mkRect</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span> <span class='hs-varid'>ws</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Rectangle</span> <span class='hs-varid'>xs</span> <span class='hs-layout'>(</span><span class='hs-varid'>ys</span><span class='hs-varop'>+</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-varid'>ws</span> <span class='hs-varid'>h</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="xn"></a><span class='hs-definition'>xn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dimension</span>
<a name="line-66"></a><span class='hs-definition'>xn</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-varid'>q</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>q</span><span class='hs-varop'>==</span><span class='hs-num'>1</span> <span class='hs-keyword'>then</span>
<a name="line-67"></a> <span class='hs-varid'>h</span> <span class='hs-varop'>`div`</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-68"></a> <span class='hs-keyword'>else</span>
<a name="line-69"></a> <span class='hs-varid'>round</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span><span class='hs-varop'>*</span><span class='hs-varid'>q</span><span class='hs-varop'>^</span><span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-varid'>k</span><span class='hs-layout'>)</span><span class='hs-varop'>*</span><span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-comment'>-</span><span class='hs-varid'>q</span><span class='hs-layout'>)</span><span class='hs-varop'>/</span><span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-comment'>-</span><span class='hs-varid'>q</span><span class='hs-varop'>^</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-70"></a>
<a name="line-71"></a>
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