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<title>XMonad/Layout/PositionStoreFloat.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE TypeSynonymInstances, MultiParamTypeClasses, PatternGuards #-}</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.PositionStoreFloat</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Jan Vornberger 2009</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 : jan.vornberger@informatik.uni-oldenburg.de</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : not portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- A floating layout which has been designed with a dual-head setup</span>
<a name="line-13"></a><span class='hs-comment'>-- in mind. It makes use of "XMonad.Util.PositionStore" as well as</span>
<a name="line-14"></a><span class='hs-comment'>-- "XMonad.Hooks.PositionStoreHooks" . Since there is currently no way</span>
<a name="line-15"></a><span class='hs-comment'>-- to move or resize windows with the keyboard alone in this layout,</span>
<a name="line-16"></a><span class='hs-comment'>-- it is adviced to use it in combination with a decoration such as</span>
<a name="line-17"></a><span class='hs-comment'>-- "XMonad.Layout.NoFrillsDecoration" (to move windows) and the</span>
<a name="line-18"></a><span class='hs-comment'>-- layout modifier "XMonad.Layout.BorderResize" (to resize windows).</span>
<a name="line-19"></a><span class='hs-comment'>--</span>
<a name="line-20"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-21"></a>
<a name="line-22"></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'>PositionStoreFloat</span>
<a name="line-23"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Usage</span>
<a name="line-24"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-25"></a> <span class='hs-varid'>positionStoreFloat</span><span class='hs-layout'>,</span> <span class='hs-conid'>PositionStoreFloat</span>
<a name="line-26"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span><span class='hs-varop'>.</span><span class='hs-conid'>PositionStore</span>
<a name="line-30"></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-31"></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'>WindowArranger</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-layout'>(</span><span class='hs-varid'>when</span><span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span><span class='hs-layout'>(</span><span class='hs-varid'>isJust</span><span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span><span class='hs-layout'>(</span><span class='hs-varid'>nub</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-comment'>-- $usage</span>
<a name="line-37"></a><span class='hs-comment'>-- You can use this module with the following in your @~\/.xmonad\/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.PositionStoreFloat</span>
<a name="line-40"></a><span class='hs-comment'>-- > import XMonad.Layout.NoFrillsDecoration</span>
<a name="line-41"></a><span class='hs-comment'>-- > import XMonad.Layout.BorderResize</span>
<a name="line-42"></a><span class='hs-comment'>--</span>
<a name="line-43"></a><span class='hs-comment'>-- Then edit your @layoutHook@ by adding the PositionStoreFloat layout.</span>
<a name="line-44"></a><span class='hs-comment'>-- Below is a suggestion which uses the mentioned NoFrillsDecoration and</span>
<a name="line-45"></a><span class='hs-comment'>-- BorderResize:</span>
<a name="line-46"></a><span class='hs-comment'>--</span>
<a name="line-47"></a><span class='hs-comment'>-- > myLayouts = floatingDeco $ borderResize $ positionStoreFloat ||| etc..</span>
<a name="line-48"></a><span class='hs-comment'>-- > where floatingDeco l = noFrillsDeco shrinkText defaultTheme l</span>
<a name="line-49"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myLayouts }</span>
<a name="line-50"></a><span class='hs-comment'>--</span>
<a name="line-51"></a><span class='hs-comment'>-- See the documentation of "XMonad.Hooks.PositionStoreHooks" on how</span>
<a name="line-52"></a><span class='hs-comment'>-- to add the support hooks.</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="positionStoreFloat"></a><span class='hs-definition'>positionStoreFloat</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PositionStoreFloat</span> <span class='hs-varid'>a</span>
<a name="line-55"></a><span class='hs-definition'>positionStoreFloat</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PSF</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-56"></a>
<a name="line-57"></a><a name="PositionStoreFloat"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>PositionStoreFloat</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PSF</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>Rectangle</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</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-58"></a><a name="instance%20LayoutClass%20PositionStoreFloat%20Window"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-conid'>PositionStoreFloat</span> <span class='hs-conid'>Window</span> <span class='hs-keyword'>where</span>
<a name="line-59"></a> <span class='hs-varid'>description</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"PSF"</span>
<a name="line-60"></a> <span class='hs-varid'>doLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>PSF</span> <span class='hs-layout'>(</span><span class='hs-varid'>maybeChange</span><span class='hs-layout'>,</span> <span class='hs-varid'>paintOrder</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>sr</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>w</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-61"></a> <span class='hs-varid'>posStore</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getPosStore</span>
<a name="line-62"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>wrs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>w'</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>w'</span><span class='hs-layout'>,</span> <span class='hs-varid'>pSQ</span> <span class='hs-varid'>posStore</span> <span class='hs-varid'>w'</span> <span class='hs-varid'>sr</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>l</span> <span class='hs-varop'>++</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-63"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>focused</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>maybeChange</span> <span class='hs-keyword'>of</span>
<a name="line-64"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>pSQ</span> <span class='hs-varid'>posStore</span> <span class='hs-varid'>w</span> <span class='hs-varid'>sr</span><span class='hs-layout'>)</span>
<a name="line-65"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>changedRect</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>changedRect</span><span class='hs-layout'>)</span>
<a name="line-66"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>wrs'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>focused</span> <span class='hs-conop'>:</span> <span class='hs-varid'>wrs</span>
<a name="line-67"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>paintOrder'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>nub</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span> <span class='hs-conop'>:</span> <span class='hs-varid'>paintOrder</span><span class='hs-layout'>)</span>
<a name="line-68"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>isJust</span> <span class='hs-varid'>maybeChange</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-69"></a> <span class='hs-varid'>updatePositionStore</span> <span class='hs-varid'>focused</span> <span class='hs-varid'>sr</span>
<a name="line-70"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>reorder</span> <span class='hs-varid'>wrs'</span> <span class='hs-varid'>paintOrder'</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PSF</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-varid'>paintOrder'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-keyword'>where</span>
<a name="line-72"></a> <span class='hs-varid'>pSQ</span> <span class='hs-varid'>posStore</span> <span class='hs-varid'>w'</span> <span class='hs-varid'>sr'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>posStoreQuery</span> <span class='hs-varid'>posStore</span> <span class='hs-varid'>w'</span> <span class='hs-varid'>sr'</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-73"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>rect</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>rect</span>
<a name="line-74"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-num'>50</span> <span class='hs-num'>50</span> <span class='hs-num'>200</span> <span class='hs-num'>200</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- should usually not happen</span>
<a name="line-75"></a> <span class='hs-varid'>pureMessage</span> <span class='hs-layout'>(</span><span class='hs-conid'>PSF</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>paintOrder</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-76"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>SetGeometry</span> <span class='hs-varid'>rect</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-77"></a> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PSF</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>rect</span><span class='hs-layout'>,</span> <span class='hs-varid'>paintOrder</span><span class='hs-layout'>)</span>
<a name="line-78"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="updatePositionStore"></a><span class='hs-definition'>updatePositionStore</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-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-81"></a><span class='hs-definition'>updatePositionStore</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>rect</span><span class='hs-layout'>)</span> <span class='hs-varid'>sr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>modifyPosStore</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>ps</span> <span class='hs-keyglyph'>-></span>
<a name="line-82"></a> <span class='hs-varid'>posStoreInsert</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>w</span> <span class='hs-varid'>rect</span> <span class='hs-varid'>sr</span><span class='hs-layout'>)</span>
<a name="line-83"></a>
<a name="line-84"></a><a name="reorder"></a><span class='hs-definition'>reorder</span> <span class='hs-keyglyph'>::</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> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</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-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-85"></a><span class='hs-definition'>reorder</span> <span class='hs-varid'>wrs</span> <span class='hs-varid'>order</span> <span class='hs-keyglyph'>=</span>
<a name="line-86"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ordered</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>pickElem</span> <span class='hs-varid'>wrs</span><span class='hs-layout'>)</span> <span class='hs-varid'>order</span>
<a name="line-87"></a> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span> <span class='hs-varop'>`elem`</span> <span class='hs-varid'>order</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>wrs</span>
<a name="line-88"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>ordered</span> <span class='hs-varop'>++</span> <span class='hs-varid'>rest</span>
<a name="line-89"></a> <span class='hs-keyword'>where</span>
<a name="line-90"></a> <span class='hs-varid'>pickElem</span> <span class='hs-varid'>list</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>e</span> <span class='hs-varid'>list</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-91"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>result</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>result</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-92"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
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