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<title>XMonad/Util/Timer.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : XMonad.Util.Timer</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Andrea Rossato and David Roundy 2007</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (see xmonad/LICENSE)</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : andrea.rossato@unibz.it</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : unportable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- A module for setting up timers</span>
<a name="line-12"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-13"></a>
<a name="line-14"></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'>Timer</span>
<a name="line-15"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Usage</span>
<a name="line-16"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-17"></a> <span class='hs-varid'>startTimer</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>handleTimer</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>TimerId</span>
<a name="line-20"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Unique</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Process</span> <span class='hs-layout'>(</span><span class='hs-varid'>forkProcess</span><span class='hs-layout'>)</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-comment'>-- $usage</span>
<a name="line-29"></a><span class='hs-comment'>-- This module can be used to setup a timer to handle deferred events.</span>
<a name="line-30"></a><span class='hs-comment'>-- See 'XMonad.Layout.ShowWName' for an usage example.</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="TimerId"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>TimerId</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="startTimer"></a><span class='hs-comment'>-- | Start a timer, which will send a ClientMessageEvent after some</span>
<a name="line-35"></a><span class='hs-comment'>-- time (in seconds).</span>
<a name="line-36"></a><span class='hs-definition'>startTimer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Rational</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>TimerId</span>
<a name="line-37"></a><span class='hs-definition'>startTimer</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-38"></a> <span class='hs-varid'>u</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>hashUnique</span> <span class='hs-varop'><$></span> <span class='hs-varid'>newUnique</span>
<a name="line-39"></a> <span class='hs-varid'>forkProcess</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-40"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>openDisplay</span> <span class='hs-str'>""</span>
<a name="line-41"></a> <span class='hs-varid'>rw</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>rootWindow</span> <span class='hs-varid'>d</span> <span class='hs-varop'>$</span> <span class='hs-varid'>defaultScreen</span> <span class='hs-varid'>d</span>
<a name="line-42"></a> <span class='hs-varid'>threadDelay</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-varop'>$</span> <span class='hs-varid'>s</span> <span class='hs-varop'>*</span> <span class='hs-num'>1000000</span><span class='hs-layout'>)</span>
<a name="line-43"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>internAtom</span> <span class='hs-varid'>d</span> <span class='hs-str'>"XMONAD_TIMER"</span> <span class='hs-conid'>False</span>
<a name="line-44"></a> <span class='hs-varid'>allocaXEvent</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-45"></a> <span class='hs-varid'>setEventType</span> <span class='hs-varid'>e</span> <span class='hs-varid'>clientMessage</span>
<a name="line-46"></a> <span class='hs-varid'>setClientMessageEvent</span> <span class='hs-varid'>e</span> <span class='hs-varid'>rw</span> <span class='hs-varid'>a</span> <span class='hs-num'>32</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>currentTime</span>
<a name="line-47"></a> <span class='hs-varid'>sendEvent</span> <span class='hs-varid'>d</span> <span class='hs-varid'>rw</span> <span class='hs-conid'>False</span> <span class='hs-varid'>structureNotifyMask</span> <span class='hs-varid'>e</span>
<a name="line-48"></a> <span class='hs-varid'>sync</span> <span class='hs-varid'>d</span> <span class='hs-conid'>False</span>
<a name="line-49"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>u</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="handleTimer"></a><span class='hs-comment'>-- | Given a 'TimerId' and an 'Event', run an action when the 'Event'</span>
<a name="line-52"></a><span class='hs-comment'>-- has been sent by the timer specified by the 'TimerId'</span>
<a name="line-53"></a><span class='hs-definition'>handleTimer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TimerId</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-54"></a><span class='hs-definition'>handleTimer</span> <span class='hs-varid'>ti</span> <span class='hs-layout'>(</span><span class='hs-conid'>ClientMessageEvent</span> <span class='hs-layout'>{</span><span class='hs-varid'>ev_message_type</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mt</span><span class='hs-layout'>,</span> <span class='hs-varid'>ev_data</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dt</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-55"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>asks</span> <span class='hs-varid'>display</span>
<a name="line-56"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-varid'>internAtom</span> <span class='hs-varid'>d</span> <span class='hs-str'>"XMONAD_TIMER"</span> <span class='hs-conid'>False</span>
<a name="line-57"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>mt</span> <span class='hs-varop'>==</span> <span class='hs-varid'>a</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>dt</span> <span class='hs-varop'>/=</span> <span class='hs-conid'>[]</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>dt</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>ti</span>
<a name="line-58"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>action</span>
<a name="line-59"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-60"></a><span class='hs-definition'>handleTimer</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
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