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<title>XMonad/Layout/Spacing.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.Spacing</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) Brent Yorgey</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 : <byorgey@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 : portable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- Add a configurable amount of space around windows.</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'>Spacing</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'>spacing</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</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-layout'>)</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Arrow</span> <span class='hs-layout'>(</span><span class='hs-varid'>second</span><span class='hs-layout'>)</span>
<a name="line-26"></a>
<a name="line-27"></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-28"></a>
<a name="line-29"></a><span class='hs-comment'>-- $usage</span>
<a name="line-30"></a><span class='hs-comment'>-- You can use this module by importing it into your @~\/.xmonad\/xmonad.hs@ file:</span>
<a name="line-31"></a><span class='hs-comment'>--</span>
<a name="line-32"></a><span class='hs-comment'>-- > import XMonad.Layout.Spacing</span>
<a name="line-33"></a><span class='hs-comment'>--</span>
<a name="line-34"></a><span class='hs-comment'>-- and modifying your layoutHook as follows (for example):</span>
<a name="line-35"></a><span class='hs-comment'>--</span>
<a name="line-36"></a><span class='hs-comment'>-- > layoutHook = spacing 2 $ Tall 1 (3/100) (1/2)</span>
<a name="line-37"></a><span class='hs-comment'>-- > -- put a 2px space around every window</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="spacing"></a><span class='hs-comment'>-- | Surround all windows by a certain number of pixels of blank space.</span>
<a name="line-41"></a><span class='hs-definition'>spacing</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</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'>Spacing</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-42"></a><span class='hs-definition'>spacing</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Spacing</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="Spacing"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Spacing</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Spacing</span> <span class='hs-conid'>Int</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-45"></a>
<a name="line-46"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutModifier</span> <span class='hs-conid'>Spacing</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-47"></a>
<a name="line-48"></a> <span class='hs-varid'>pureModifier</span> <span class='hs-layout'>(</span><span class='hs-conid'>Spacing</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>wrs</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>second</span> <span class='hs-varop'>$</span> <span class='hs-varid'>shrinkRect</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varid'>wrs</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-49"></a>
<a name="line-50"></a> <span class='hs-varid'>modifierDescription</span> <span class='hs-layout'>(</span><span class='hs-conid'>Spacing</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"Spacing "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>p</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="shrinkRect"></a><span class='hs-definition'>shrinkRect</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'>Rectangle</span>
<a name="line-53"></a><span class='hs-definition'>shrinkRect</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</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><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Rectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-varop'>+</span><span class='hs-varid'>fi</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-varop'>+</span><span class='hs-varid'>fi</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-varop'>*</span><span class='hs-varid'>fi</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-varop'>*</span><span class='hs-varid'>fi</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>fi</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span> <span class='hs-comment'>-- avoid the DMR</span>
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