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<h1>synchtimer.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> *  synchtimer.cpp  -  timers which synchronise to time boundaries</span>
<a name="l00003"></a>00003 <span class="comment"> *  Program:  kalarm</span>
<a name="l00004"></a>00004 <span class="comment"> *  Copyright (C) 2004, 2005 by David Jarvie &lt;software@astrojar.org.uk&gt;</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> *  This program is free software; you can redistribute it and/or modify</span>
<a name="l00007"></a>00007 <span class="comment"> *  it under the terms of the GNU General Public License as published by</span>
<a name="l00008"></a>00008 <span class="comment"> *  the Free Software Foundation; either version 2 of the License, or</span>
<a name="l00009"></a>00009 <span class="comment"> *  (at your option) any later version.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> *  This program is distributed in the hope that it will be useful,</span>
<a name="l00012"></a>00012 <span class="comment"> *  but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment"> *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00014"></a>00014 <span class="comment"> *  GNU General Public License for more details.</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> *  You should have received a copy of the GNU General Public License along</span>
<a name="l00017"></a>00017 <span class="comment"> *  with this program; if not, write to the Free Software Foundation, Inc.,</span>
<a name="l00018"></a>00018 <span class="comment"> *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.</span>
<a name="l00019"></a>00019 <span class="comment"> */</span>
<a name="l00020"></a>00020 
<a name="l00021"></a>00021 <span class="preprocessor">#include "kalarm.h"</span>
<a name="l00022"></a>00022 <span class="preprocessor">#include &lt;qtimer.h&gt;</span>
<a name="l00023"></a>00023 <span class="preprocessor">#include &lt;kdebug.h&gt;</span>
<a name="l00024"></a>00024 <span class="preprocessor">#include "synchtimer.moc"</span>
<a name="l00025"></a>00025 
<a name="l00026"></a>00026 
<a name="l00027"></a>00027 <span class="comment">/*=============================================================================</span>
<a name="l00028"></a>00028 <span class="comment">=  Class: SynchTimer</span>
<a name="l00029"></a>00029 <span class="comment">=  Virtual base class for application-wide timer synchronised to a time boundary.</span>
<a name="l00030"></a>00030 <span class="comment">=============================================================================*/</span>
<a name="l00031"></a>00031 
<a name="l00032"></a>00032 SynchTimer::SynchTimer()
<a name="l00033"></a>00033 {
<a name="l00034"></a>00034     mTimer = <span class="keyword">new</span> QTimer(<span class="keyword">this</span>, <span class="stringliteral">"mTimer"</span>);
<a name="l00035"></a>00035 }
<a name="l00036"></a>00036 
<a name="l00037"></a>00037 SynchTimer::~SynchTimer()
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039     <span class="keyword">delete</span> mTimer;
<a name="l00040"></a>00040     mTimer = 0;
<a name="l00041"></a>00041 }
<a name="l00042"></a>00042 
<a name="l00043"></a>00043 <span class="comment">/******************************************************************************</span>
<a name="l00044"></a>00044 <span class="comment">* Connect to the timer. The timer is started if necessary.</span>
<a name="l00045"></a>00045 <span class="comment">*/</span>
<a name="l00046"></a>00046 <span class="keywordtype">void</span> SynchTimer::connecT(QObject* receiver, <span class="keyword">const</span> <span class="keywordtype">char</span>* member)
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048     Connection connection(receiver, member);
<a name="l00049"></a>00049     <span class="keywordflow">if</span> (mConnections.find(connection) != mConnections.end())
<a name="l00050"></a>00050         <span class="keywordflow">return</span>;           <span class="comment">// the slot is already connected, so ignore request</span>
<a name="l00051"></a>00051     connect(mTimer, SIGNAL(timeout()), receiver, member);
<a name="l00052"></a>00052     mConnections.append(connection);
<a name="l00053"></a>00053     <span class="keywordflow">if</span> (!mTimer-&gt;isActive())
<a name="l00054"></a>00054     {
<a name="l00055"></a>00055         connect(mTimer, SIGNAL(timeout()), <span class="keyword">this</span>, SLOT(slotTimer()));
<a name="l00056"></a>00056         start();
<a name="l00057"></a>00057     }
<a name="l00058"></a>00058 }
<a name="l00059"></a>00059 
<a name="l00060"></a>00060 <span class="comment">/******************************************************************************</span>
<a name="l00061"></a>00061 <span class="comment">* Disconnect from the timer. The timer is stopped if no longer needed.</span>
<a name="l00062"></a>00062 <span class="comment">*/</span>
<a name="l00063"></a>00063 <span class="keywordtype">void</span> SynchTimer::disconnecT(QObject* receiver, <span class="keyword">const</span> <span class="keywordtype">char</span>* member)
<a name="l00064"></a>00064 {
<a name="l00065"></a>00065     <span class="keywordflow">if</span> (mTimer)
<a name="l00066"></a>00066     {
<a name="l00067"></a>00067         mTimer-&gt;disconnect(receiver, member);
<a name="l00068"></a>00068         <span class="keywordflow">if</span> (member)
<a name="l00069"></a>00069             mConnections.remove(Connection(receiver, member));
<a name="l00070"></a>00070         <span class="keywordflow">else</span>
<a name="l00071"></a>00071         {
<a name="l00072"></a>00072             <span class="keywordflow">for</span> (QValueList&lt;Connection&gt;::Iterator it = mConnections.begin();  it != mConnections.end();  )
<a name="l00073"></a>00073             {
<a name="l00074"></a>00074                 <span class="keywordflow">if</span> ((*it).receiver == receiver)
<a name="l00075"></a>00075                     it = mConnections.remove(it);
<a name="l00076"></a>00076                 <span class="keywordflow">else</span>
<a name="l00077"></a>00077                     ++it;
<a name="l00078"></a>00078             }
<a name="l00079"></a>00079         }
<a name="l00080"></a>00080         <span class="keywordflow">if</span> (mConnections.isEmpty())
<a name="l00081"></a>00081         {
<a name="l00082"></a>00082             mTimer-&gt;disconnect();
<a name="l00083"></a>00083             mTimer-&gt;stop();
<a name="l00084"></a>00084         }
<a name="l00085"></a>00085     }
<a name="l00086"></a>00086 }
<a name="l00087"></a>00087 
<a name="l00088"></a>00088 
<a name="l00089"></a>00089 <span class="comment">/*=============================================================================</span>
<a name="l00090"></a>00090 <span class="comment">=  Class: MinuteTimer</span>
<a name="l00091"></a>00091 <span class="comment">=  Application-wide timer synchronised to the minute boundary.</span>
<a name="l00092"></a>00092 <span class="comment">=============================================================================*/</span>
<a name="l00093"></a>00093 
<a name="l00094"></a>00094 <a class="code" href="classMinuteTimer.html" title="MinuteTimer is an application-wide timer synchronised to the minute boundary.">MinuteTimer</a>* MinuteTimer::mInstance = 0;
<a name="l00095"></a>00095 
<a name="l00096"></a>00096 <a class="code" href="classMinuteTimer.html" title="MinuteTimer is an application-wide timer synchronised to the minute boundary.">MinuteTimer</a>* MinuteTimer::instance()
<a name="l00097"></a>00097 {
<a name="l00098"></a>00098     <span class="keywordflow">if</span> (!mInstance)
<a name="l00099"></a>00099         mInstance = <span class="keyword">new</span> <a class="code" href="classMinuteTimer.html" title="MinuteTimer is an application-wide timer synchronised to the minute boundary.">MinuteTimer</a>;
<a name="l00100"></a>00100     <span class="keywordflow">return</span> mInstance;
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102 
<a name="l00103"></a>00103 <span class="comment">/******************************************************************************</span>
<a name="l00104"></a>00104 <span class="comment">* Called when the timer triggers, or to start the timer.</span>
<a name="l00105"></a>00105 <span class="comment">* Timers can under some circumstances wander off from the correct trigger time,</span>
<a name="l00106"></a>00106 <span class="comment">* so rather than setting a 1 minute interval, calculate the correct next</span>
<a name="l00107"></a>00107 <span class="comment">* interval each time it triggers.</span>
<a name="l00108"></a>00108 <span class="comment">*/</span>
<a name="l00109"></a>00109 <span class="keywordtype">void</span> MinuteTimer::slotTimer()
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111     kdDebug(5950) &lt;&lt; <span class="stringliteral">"MinuteTimer::slotTimer()"</span> &lt;&lt; endl;
<a name="l00112"></a>00112     <span class="keywordtype">int</span> interval = 62 - QTime::currentTime().second();
<a name="l00113"></a>00113     mTimer-&gt;start(interval * 1000, <span class="keyword">true</span>);     <span class="comment">// execute a single shot</span>
<a name="l00114"></a>00114 }
<a name="l00115"></a>00115 
<a name="l00116"></a>00116 
<a name="l00117"></a>00117 <span class="comment">/*=============================================================================</span>
<a name="l00118"></a>00118 <span class="comment">=  Class: DailyTimer</span>
<a name="l00119"></a>00119 <span class="comment">=  Application-wide timer synchronised to midnight.</span>
<a name="l00120"></a>00120 <span class="comment">=============================================================================*/</span>
<a name="l00121"></a>00121 
<a name="l00122"></a>00122 QValueList&lt;DailyTimer*&gt; DailyTimer::mFixedTimers;
<a name="l00123"></a>00123 
<a name="l00124"></a><a class="code" href="classDailyTimer.html#723fc7a240b88430dfaf2335d4df2ffa">00124</a> <a class="code" href="classDailyTimer.html#723fc7a240b88430dfaf2335d4df2ffa" title="Construct an instance.">DailyTimer::DailyTimer</a>(<span class="keyword">const</span> QTime&amp; timeOfDay, <span class="keywordtype">bool</span> fixed)
<a name="l00125"></a>00125     : mTime(timeOfDay),
<a name="l00126"></a>00126       mFixed(fixed)
<a name="l00127"></a>00127 {
<a name="l00128"></a>00128     <span class="keywordflow">if</span> (fixed)
<a name="l00129"></a>00129         mFixedTimers.append(<span class="keyword">this</span>);
<a name="l00130"></a>00130 }
<a name="l00131"></a>00131 
<a name="l00132"></a>00132 DailyTimer::~DailyTimer()
<a name="l00133"></a>00133 {
<a name="l00134"></a>00134     <span class="keywordflow">if</span> (mFixed)
<a name="l00135"></a>00135         mFixedTimers.remove(<span class="keyword">this</span>);
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137 
<a name="l00138"></a><a class="code" href="classDailyTimer.html#a9527b0e04cd0081f02a9f674d4b2280">00138</a> <a class="code" href="classDailyTimer.html" title="DailyTimer is an application-wide timer synchronised to a specified time of day,...">DailyTimer</a>* <a class="code" href="classDailyTimer.html#a9527b0e04cd0081f02a9f674d4b2280" title="Return the instance which triggers at the specified fixed time of day, optionally...">DailyTimer::fixedInstance</a>(<span class="keyword">const</span> QTime&amp; <a class="code" href="classDailyTimer.html#ad7b5ff4fab7f33b89d7c7315a7bbfb9" title="Return the current time of day at which this variable timer triggers.">timeOfDay</a>, <span class="keywordtype">bool</span> create)
<a name="l00139"></a>00139 {
<a name="l00140"></a>00140     <span class="keywordflow">for</span> (QValueList&lt;DailyTimer*&gt;::Iterator it = mFixedTimers.begin();  it != mFixedTimers.end();  ++it)
<a name="l00141"></a>00141         <span class="keywordflow">if</span> ((*it)-&gt;mTime == timeOfDay)
<a name="l00142"></a>00142             <span class="keywordflow">return</span> *it;
<a name="l00143"></a>00143     <span class="keywordflow">return</span> create ? <span class="keyword">new</span> <a class="code" href="classDailyTimer.html#723fc7a240b88430dfaf2335d4df2ffa" title="Construct an instance.">DailyTimer</a>(timeOfDay, <span class="keyword">true</span>) : 0;
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 
<a name="l00146"></a>00146 <span class="comment">/******************************************************************************</span>
<a name="l00147"></a>00147 <span class="comment">* Disconnect from the timer signal which triggers at the given fixed time of day.</span>
<a name="l00148"></a>00148 <span class="comment">* If there are no remaining connections to that timer, it is destroyed.</span>
<a name="l00149"></a>00149 <span class="comment">*/</span>
<a name="l00150"></a><a class="code" href="classDailyTimer.html#5ca372ed852354a69b2453d98fe560f0">00150</a> <span class="keywordtype">void</span> <a class="code" href="classDailyTimer.html#5ca372ed852354a69b2453d98fe560f0" title="Disconnect from the timer signal which triggers at the given fixed time of day.">DailyTimer::disconnect</a>(<span class="keyword">const</span> QTime&amp; <a class="code" href="classDailyTimer.html#ad7b5ff4fab7f33b89d7c7315a7bbfb9" title="Return the current time of day at which this variable timer triggers.">timeOfDay</a>, QObject* receiver, <span class="keyword">const</span> <span class="keywordtype">char</span>* member)
<a name="l00151"></a>00151 {
<a name="l00152"></a>00152     <a class="code" href="classDailyTimer.html" title="DailyTimer is an application-wide timer synchronised to a specified time of day,...">DailyTimer</a>* timer = <a class="code" href="classDailyTimer.html#a9527b0e04cd0081f02a9f674d4b2280" title="Return the instance which triggers at the specified fixed time of day, optionally...">fixedInstance</a>(timeOfDay, <span class="keyword">false</span>);
<a name="l00153"></a>00153     <span class="keywordflow">if</span> (!timer)
<a name="l00154"></a>00154         <span class="keywordflow">return</span>;
<a name="l00155"></a>00155     timer-&gt;<a class="code" href="classSynchTimer.html#b9b03d0659691f47b5bbf8a037543a9a">disconnecT</a>(receiver, member);
<a name="l00156"></a>00156     <span class="keywordflow">if</span> (!timer-&gt;<a class="code" href="classSynchTimer.html#cb9bcdf0daac6b1a1136c5c5ff44559f">hasConnections</a>())
<a name="l00157"></a>00157         <span class="keyword">delete</span> timer;
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 
<a name="l00160"></a>00160 <span class="comment">/******************************************************************************</span>
<a name="l00161"></a>00161 <span class="comment">* Change the time at which the variable timer triggers.</span>
<a name="l00162"></a>00162 <span class="comment">*/</span>
<a name="l00163"></a><a class="code" href="classDailyTimer.html#9bce14be3656e703a7b1fecfba4bb8b3">00163</a> <span class="keywordtype">void</span> <a class="code" href="classDailyTimer.html#9bce14be3656e703a7b1fecfba4bb8b3" title="Change the time at which this variable timer triggers.">DailyTimer::changeTime</a>(<span class="keyword">const</span> QTime&amp; newTimeOfDay, <span class="keywordtype">bool</span> triggerMissed)
<a name="l00164"></a>00164 {
<a name="l00165"></a>00165     <span class="keywordflow">if</span> (mFixed)
<a name="l00166"></a>00166         <span class="keywordflow">return</span>;
<a name="l00167"></a>00167     <span class="keywordflow">if</span> (mTimer-&gt;isActive())
<a name="l00168"></a>00168     {
<a name="l00169"></a>00169         mTimer-&gt;stop();
<a name="l00170"></a>00170         <span class="keywordtype">bool</span> triggerNow = <span class="keyword">false</span>;
<a name="l00171"></a>00171         <span class="keywordflow">if</span> (triggerMissed)
<a name="l00172"></a>00172         {
<a name="l00173"></a>00173             QTime now = QTime::currentTime();
<a name="l00174"></a>00174             <span class="keywordflow">if</span> (now &gt;= newTimeOfDay  &amp;&amp;  now &lt; mTime)
<a name="l00175"></a>00175             {
<a name="l00176"></a>00176                 <span class="comment">// The trigger time is now earlier and it has already arrived today.</span>
<a name="l00177"></a>00177                 <span class="comment">// Trigger a timer event immediately.</span>
<a name="l00178"></a>00178                 triggerNow = <span class="keyword">true</span>;
<a name="l00179"></a>00179             }
<a name="l00180"></a>00180         }
<a name="l00181"></a>00181         mTime = newTimeOfDay;
<a name="l00182"></a>00182         <span class="keywordflow">if</span> (triggerNow)
<a name="l00183"></a>00183             mTimer-&gt;start(0, <span class="keyword">true</span>);    <span class="comment">// trigger immediately</span>
<a name="l00184"></a>00184         <span class="keywordflow">else</span>
<a name="l00185"></a>00185             start();
<a name="l00186"></a>00186     }
<a name="l00187"></a>00187     <span class="keywordflow">else</span>
<a name="l00188"></a>00188         mTime = newTimeOfDay;
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190 
<a name="l00191"></a>00191 <span class="comment">/******************************************************************************</span>
<a name="l00192"></a>00192 <span class="comment">* Initialise the timer to trigger at the specified time.</span>
<a name="l00193"></a>00193 <span class="comment">* This will either be today or tomorrow, depending on whether the trigger time</span>
<a name="l00194"></a>00194 <span class="comment">* has already passed.</span>
<a name="l00195"></a>00195 <span class="comment">*/</span>
<a name="l00196"></a>00196 <span class="keywordtype">void</span> DailyTimer::start()
<a name="l00197"></a>00197 {
<a name="l00198"></a>00198     <span class="comment">// TIMEZONE = local time</span>
<a name="l00199"></a>00199     QDateTime now = QDateTime::currentDateTime();
<a name="l00200"></a>00200     <span class="comment">// Find out whether to trigger today or tomorrow.</span>
<a name="l00201"></a>00201     <span class="comment">// In preference, use the last trigger date to determine this, since</span>
<a name="l00202"></a>00202     <span class="comment">// that will avoid possible errors due to daylight savings time changes.</span>
<a name="l00203"></a>00203     <span class="keywordtype">bool</span> today;
<a name="l00204"></a>00204     <span class="keywordflow">if</span> (mLastDate.isValid())
<a name="l00205"></a>00205         today = (mLastDate &lt; now.date());
<a name="l00206"></a>00206     <span class="keywordflow">else</span>
<a name="l00207"></a>00207         today = (now.time() &lt; mTime);
<a name="l00208"></a>00208     QDateTime next;
<a name="l00209"></a>00209     <span class="keywordflow">if</span> (today)
<a name="l00210"></a>00210         next = QDateTime(now.date(), mTime);
<a name="l00211"></a>00211     <span class="keywordflow">else</span>
<a name="l00212"></a>00212         next = QDateTime(now.date().addDays(1), mTime);
<a name="l00213"></a>00213     uint interval = next.toTime_t() - now.toTime_t();
<a name="l00214"></a>00214     mTimer-&gt;start(interval * 1000, <span class="keyword">true</span>);    <span class="comment">// execute a single shot</span>
<a name="l00215"></a>00215     kdDebug(5950) &lt;&lt; <span class="stringliteral">"DailyTimer::start(at "</span> &lt;&lt; mTime.hour() &lt;&lt; <span class="stringliteral">":"</span> &lt;&lt; mTime.minute() &lt;&lt; <span class="stringliteral">"): interval = "</span> &lt;&lt; interval/3600 &lt;&lt; <span class="stringliteral">":"</span> &lt;&lt; (interval/60)%60 &lt;&lt; <span class="stringliteral">":"</span> &lt;&lt; interval%60 &lt;&lt; endl;
<a name="l00216"></a>00216 }
<a name="l00217"></a>00217 
<a name="l00218"></a>00218 <span class="comment">/******************************************************************************</span>
<a name="l00219"></a>00219 <span class="comment">* Called when the timer triggers.</span>
<a name="l00220"></a>00220 <span class="comment">* Set the timer to trigger again tomorrow at the specified time.</span>
<a name="l00221"></a>00221 <span class="comment">* Note that if daylight savings time changes occur, this will not be 24 hours</span>
<a name="l00222"></a>00222 <span class="comment">* from now.</span>
<a name="l00223"></a>00223 <span class="comment">*/</span>
<a name="l00224"></a>00224 <span class="keywordtype">void</span> DailyTimer::slotTimer()
<a name="l00225"></a>00225 {
<a name="l00226"></a>00226     <span class="comment">// TIMEZONE = local time</span>
<a name="l00227"></a>00227     QDateTime now = QDateTime::currentDateTime();
<a name="l00228"></a>00228     mLastDate = now.date();
<a name="l00229"></a>00229     QDateTime next = QDateTime(mLastDate.addDays(1), mTime);
<a name="l00230"></a>00230     uint interval = next.toTime_t() - now.toTime_t();
<a name="l00231"></a>00231     mTimer-&gt;start(interval * 1000, <span class="keyword">true</span>);    <span class="comment">// execute a single shot</span>
<a name="l00232"></a>00232     kdDebug(5950) &lt;&lt; <span class="stringliteral">"DailyTimer::slotTimer(at "</span> &lt;&lt; mTime.hour() &lt;&lt; <span class="stringliteral">":"</span> &lt;&lt; mTime.minute() &lt;&lt; <span class="stringliteral">"): interval = "</span> &lt;&lt; interval/3600 &lt;&lt; <span class="stringliteral">":"</span> &lt;&lt; (interval/60)%60 &lt;&lt; <span class="stringliteral">":"</span> &lt;&lt; interval%60 &lt;&lt; endl;
<a name="l00233"></a>00233 }
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