<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>XMonad/Util/PositionStore.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable #-}</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.Util.PositionStore</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) Jan Vornberger 2009</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 : jan.vornberger@informatik.uni-oldenburg.de</span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : not portable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- A utility module to store information about position and size of a window.</span>
<a name="line-14"></a><span class='hs-comment'>-- See "XMonad.Layout.PositionStoreFloat" for a layout that makes use of this.</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'>Util</span><span class='hs-varop'>.</span><span class='hs-conid'>PositionStore</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-varid'>getPosStore</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-varid'>modifyPosStore</span><span class='hs-layout'>,</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-varid'>posStoreInsert</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-varid'>posStoreMove</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-varid'>posStoreQuery</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-varid'>posStoreRemove</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-conid'>PositionStore</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</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'>Util</span><span class='hs-varop'>.</span><span class='hs-conid'>ExtensibleState</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>XS</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>M</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-comment'>-- Store window positions relative to the upper left screen edge</span>
<a name="line-34"></a><span class='hs-comment'>-- and windows sizes as well as positions as fractions of the screen size.</span>
<a name="line-35"></a><span class='hs-comment'>-- This way windows can be easily relocated and scaled when switching screens.</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="PositionStore"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>PositionStore</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PS</span> <span class='hs-layout'>(</span><span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-conid'>Window</span> <span class='hs-conid'>PosStoreRectangle</span><span class='hs-layout'>)</span>
<a name="line-38"></a> <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><span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-39"></a><a name="PosStoreRectangle"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>PosStoreRectangle</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PSRectangle</span> <span class='hs-conid'>Double</span> <span class='hs-conid'>Double</span> <span class='hs-conid'>Dimension</span> <span class='hs-conid'>Dimension</span>
<a name="line-40"></a> <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><span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="instance%20ExtensionClass%20PositionStore"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>ExtensionClass</span> <span class='hs-conid'>PositionStore</span> <span class='hs-keyword'>where</span>
<a name="line-43"></a> <span class='hs-varid'>initialValue</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PS</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span>
<a name="line-44"></a> <span class='hs-varid'>extensionType</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PersistentExtension</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="getPosStore"></a><span class='hs-definition'>getPosStore</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>X</span> <span class='hs-layout'>(</span><span class='hs-conid'>PositionStore</span><span class='hs-layout'>)</span>
<a name="line-47"></a><span class='hs-definition'>getPosStore</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>XS</span><span class='hs-varop'>.</span><span class='hs-varid'>get</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="modifyPosStore"></a><span class='hs-definition'>modifyPosStore</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>PositionStore</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PositionStore</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-50"></a><span class='hs-definition'>modifyPosStore</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>XS</span><span class='hs-varop'>.</span><span class='hs-varid'>modify</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="posStoreInsert"></a><span class='hs-definition'>posStoreInsert</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PositionStore</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Window</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PositionStore</span>
<a name="line-53"></a><span class='hs-definition'>posStoreInsert</span> <span class='hs-layout'>(</span><span class='hs-conid'>PS</span> <span class='hs-varid'>posStoreMap</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</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'>wh</span> <span class='hs-varid'>ht</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>srX</span> <span class='hs-varid'>srY</span> <span class='hs-varid'>srWh</span> <span class='hs-varid'>srHt</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-54"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>offsetX</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-comment'>-</span> <span class='hs-varid'>srX</span>
<a name="line-55"></a> <span class='hs-varid'>offsetY</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span> <span class='hs-comment'>-</span> <span class='hs-varid'>srY</span>
<a name="line-56"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>PS</span> <span class='hs-varop'>$</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>insert</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>PSRectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>offsetX</span> <span class='hs-varop'>/</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>srWh</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>offsetY</span> <span class='hs-varop'>/</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>srHt</span><span class='hs-layout'>)</span>
<a name="line-58"></a> <span class='hs-layout'>(</span><span class='hs-varid'>min</span> <span class='hs-varid'>wh</span> <span class='hs-varid'>srWh</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>min</span> <span class='hs-varid'>ht</span> <span class='hs-varid'>srHt</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>posStoreMap</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="posStoreRemove"></a><span class='hs-definition'>posStoreRemove</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PositionStore</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Window</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PositionStore</span>
<a name="line-61"></a><span class='hs-definition'>posStoreRemove</span> <span class='hs-layout'>(</span><span class='hs-conid'>PS</span> <span class='hs-varid'>posStoreMap</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PS</span> <span class='hs-varop'>$</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>delete</span> <span class='hs-varid'>w</span> <span class='hs-varid'>posStoreMap</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="posStoreQuery"></a><span class='hs-definition'>posStoreQuery</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PositionStore</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Window</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Rectangle</span>
<a name="line-64"></a><span class='hs-definition'>posStoreQuery</span> <span class='hs-layout'>(</span><span class='hs-conid'>PS</span> <span class='hs-varid'>posStoreMap</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>srX</span> <span class='hs-varid'>srY</span> <span class='hs-varid'>srWh</span> <span class='hs-varid'>srHt</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-65"></a> <span class='hs-layout'>(</span><span class='hs-conid'>PSRectangle</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>wh</span> <span class='hs-varid'>ht</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>w</span> <span class='hs-varid'>posStoreMap</span>
<a name="line-66"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>realOffsetX</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>srWh</span> <span class='hs-varop'>*</span> <span class='hs-varid'>x</span>
<a name="line-67"></a> <span class='hs-varid'>realOffsetY</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>srHt</span> <span class='hs-varop'>*</span> <span class='hs-varid'>y</span>
<a name="line-68"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>srX</span> <span class='hs-varop'>+</span> <span class='hs-varid'>round</span> <span class='hs-varid'>realOffsetX</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>srY</span> <span class='hs-varop'>+</span> <span class='hs-varid'>round</span> <span class='hs-varid'>realOffsetY</span><span class='hs-layout'>)</span> <span class='hs-varid'>wh</span> <span class='hs-varid'>ht</span><span class='hs-layout'>)</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="posStoreMove"></a><span class='hs-definition'>posStoreMove</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PositionStore</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Window</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PositionStore</span>
<a name="line-71"></a><span class='hs-definition'>posStoreMove</span> <span class='hs-varid'>posStore</span> <span class='hs-varid'>w</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>oldSr</span> <span class='hs-varid'>newSr</span> <span class='hs-keyglyph'>=</span>
<a name="line-72"></a> <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'>oldSr</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-73"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>posStore</span> <span class='hs-comment'>-- not in store, can't move -> do nothing</span>
<a name="line-74"></a> <span class='hs-conid'>Just</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-varid'>wh</span> <span class='hs-varid'>ht</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>posStoreInsert</span> <span class='hs-varid'>posStore</span> <span class='hs-varid'>w</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'>wh</span> <span class='hs-varid'>ht</span><span class='hs-layout'>)</span> <span class='hs-varid'>newSr</span>
</pre></body>
</html>
