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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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   &#160;<span id="projectnumber">3.2.1</span>
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<a href="#pub-methods">Public Member Functions</a> &#124;
<a href="#pub-static-methods">Static Public Member Functions</a>  </div>
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<div class="title">Wt::WTimer Class Reference</div>  </div>
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<!-- doxytag: class="Wt::WTimer" --><!-- doxytag: inherits="Wt::WObject" -->
<p>A utility class which provides timer signals and single-shot timers.  
 <a href="classWt_1_1WTimer.html#details">More...</a></p>

<p><code>#include &lt;Wt/WTimer&gt;</code></p>
<div class="dynheader">
Inheritance diagram for Wt::WTimer:</div>
<div class="dyncontent">
<div class="center"><img src="classWt_1_1WTimer__inherit__graph.png" border="0" usemap="#Wt_1_1WTimer_inherit__map" alt="Inheritance graph"/></div>
<map name="Wt_1_1WTimer_inherit__map" id="Wt_1_1WTimer_inherit__map">
<area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="5,5,101,32"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>

<p><a href="classWt_1_1WTimer-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1fb659aac40b49b3ec7631d558884847"></a><!-- doxytag: member="Wt::WTimer::WTimer" ref="a1fb659aac40b49b3ec7631d558884847" args="(WObject *parent=0)" -->
&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#a1fb659aac40b49b3ec7631d558884847">WTimer</a> (<a class="el" href="classWt_1_1WObject.html">WObject</a> *parent=0)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Construct a new timer with the given parent. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a6b983b4aa0a3594cad4a236f5a4acd0b"></a><!-- doxytag: member="Wt::WTimer::~WTimer" ref="a6b983b4aa0a3594cad4a236f5a4acd0b" args="()" -->
&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#a6b983b4aa0a3594cad4a236f5a4acd0b">~WTimer</a> ()</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Destuctor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3aedc0ad65a5d57bea4b805a92d7736d"></a><!-- doxytag: member="Wt::WTimer::interval" ref="a3aedc0ad65a5d57bea4b805a92d7736d" args="() const " -->
int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#a3aedc0ad65a5d57bea4b805a92d7736d">interval</a> () const </td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the interval (msec). <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3a4070540a6b0e10bf1ee7bd607334fc"></a><!-- doxytag: member="Wt::WTimer::setInterval" ref="a3a4070540a6b0e10bf1ee7bd607334fc" args="(int msec)" -->
void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#a3a4070540a6b0e10bf1ee7bd607334fc">setInterval</a> (int msec)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Sets the interval (msec). <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aeabde106e48ea67e10c4043609b85493"></a><!-- doxytag: member="Wt::WTimer::isActive" ref="aeabde106e48ea67e10c4043609b85493" args="() const " -->
bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#aeabde106e48ea67e10c4043609b85493">isActive</a> () const </td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns if the timer is running. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a61dd8a5ac6fc6d9bd995e08ff7fae83c"></a><!-- doxytag: member="Wt::WTimer::isSingleShot" ref="a61dd8a5ac6fc6d9bd995e08ff7fae83c" args="() const " -->
bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#a61dd8a5ac6fc6d9bd995e08ff7fae83c">isSingleShot</a> () const </td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Is this timer set to fire only once. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#a92ae68d15de600174afdd2e443397604">setSingleShot</a> (bool singleShot)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Configures this timer to fire only once.  <a href="#a92ae68d15de600174afdd2e443397604"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#ae167fbd3eb981a2fce52e9a4b3b6e0af">start</a> ()</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Starts the timer.  <a href="#ae167fbd3eb981a2fce52e9a4b3b6e0af"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#a73c5d1b882af4835384ccdc07a650e34">stop</a> ()</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Stops the timer.  <a href="#a73c5d1b882af4835384ccdc07a650e34"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classWt_1_1EventSignal.html">EventSignal</a>&lt; <a class="el" href="classWt_1_1WMouseEvent.html">WMouseEvent</a> &gt; &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#a2a66c6a51df2b0ab42258abf2ebd0399">timeout</a> ()</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Signal emitted when the timer timeouts.  <a href="#a2a66c6a51df2b0ab42258abf2ebd0399"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr><td class="memTemplParams" colspan="2">template&lt;class T , class V &gt; </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">static void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#ac35c02164f78de697258197c5c9202c9">singleShot</a> (int msec, T *receiver, void(V::*method)())</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">This static function calls a slot after a given time interval.  <a href="#ac35c02164f78de697258197c5c9202c9"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template&lt;class F &gt; </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">static void&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1WTimer.html#ae0aa0f3402520831531f03f76056e63c">singleShot</a> (int msec, const F &amp;f)</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">This static function calls a function after a given time interval.  <a href="#ae0aa0f3402520831531f03f76056e63c"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A utility class which provides timer signals and single-shot timers. </p>
<p>To use a timer, create a WTimer instance, set the timer interval using <a class="el" href="classWt_1_1WTimer.html#a3a4070540a6b0e10bf1ee7bd607334fc" title="Sets the interval (msec).">setInterval()</a> and connect a slot to the timeout signal. Then, start the timer using <a class="el" href="classWt_1_1WTimer.html#ae167fbd3eb981a2fce52e9a4b3b6e0af" title="Starts the timer.">start()</a>. An active timer may be cancelled at any time using <a class="el" href="classWt_1_1WTimer.html#a73c5d1b882af4835384ccdc07a650e34" title="Stops the timer.">stop()</a>.</p>
<p>By default, a timer will continue to generate events until you <a class="el" href="classWt_1_1WTimer.html#a73c5d1b882af4835384ccdc07a650e34" title="Stops the timer.">stop()</a> it. To create a timer that will fire only once, use <a class="el" href="classWt_1_1WTimer.html#a92ae68d15de600174afdd2e443397604" title="Configures this timer to fire only once.">setSingleShot()</a>. There is also a convience static method <a class="el" href="classWt_1_1WTimer.html#ac35c02164f78de697258197c5c9202c9" title="This static function calls a slot after a given time interval.">singleShot()</a>.</p>
<p>When connecting stateless slot implementations to the timeout signal, these stateless slot implementations will be used as for any other signal (when Ajax is available).</p>
<p>In clients without (enabled) JavaScript support, the minimum resolution of the timer is one second (1000 milli-seconds), and it is probably wise to use timers sparingly.</p>
<p>A <a class="el" href="classWt_1_1WTimer.html" title="A utility class which provides timer signals and single-shot timers.">WTimer</a> is only usable inside of a Wt event loop. If you want to create a timer outside the Wt event loop, take a look at asio deadline_timer.</p>
<p>Timers are one way to provide updates of a web page without the user generating an event. Alternatively you may consider server-initiated updates, see <a class="el" href="classWt_1_1WApplication.html#ad9631ca64e68d30d40cb49c90e55223d" title="Enables server-initiated updates.">WApplication::enableUpdates()</a>.</p>
<p>Usage example: </p>
<div class="fragment"><pre class="fragment"> <span class="comment">// setup a timer which calls MyClass::timeout() every 2 seconds, until timer-&gt;stop() is called.</span>
 <a class="code" href="classWt_1_1WTimer.html" title="A utility class which provides timer signals and single-shot timers.">Wt::WTimer</a> *timer = <span class="keyword">new</span> <a class="code" href="classWt_1_1WTimer.html#a1fb659aac40b49b3ec7631d558884847" title="Construct a new timer with the given parent.">Wt::WTimer</a>();
 timer-&gt;<a class="code" href="classWt_1_1WTimer.html#a3a4070540a6b0e10bf1ee7bd607334fc" title="Sets the interval (msec).">setInterval</a>(2000);
 timer-&gt;<a class="code" href="classWt_1_1WTimer.html#a2a66c6a51df2b0ab42258abf2ebd0399" title="Signal emitted when the timer timeouts.">timeout</a>().connect(<span class="keyword">this</span>, &amp;MyClass::timeout);
 timer-&gt;<a class="code" href="classWt_1_1WTimer.html#ae167fbd3eb981a2fce52e9a4b3b6e0af" title="Starts the timer.">start</a>();
</pre></div> </div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a92ae68d15de600174afdd2e443397604"></a><!-- doxytag: member="Wt::WTimer::setSingleShot" ref="a92ae68d15de600174afdd2e443397604" args="(bool singleShot)" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void Wt::WTimer::setSingleShot </td>
          <td>(</td>
          <td class="paramtype">bool&#160;</td>
          <td class="paramname"><em>singleShot</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Configures this timer to fire only once. </p>
<p>A Timer is by default not single shot, and will fire continuously, until it is stopped.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WTimer.html#ac35c02164f78de697258197c5c9202c9" title="This static function calls a slot after a given time interval.">singleShot()</a> </dd></dl>

</div>
</div>
<a class="anchor" id="ac35c02164f78de697258197c5c9202c9"></a><!-- doxytag: member="Wt::WTimer::singleShot" ref="ac35c02164f78de697258197c5c9202c9" args="(int msec, T *receiver, void(V::*method)())" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;class T , class V &gt; </div>
      <table class="memname">
        <tr>
          <td class="memname">void Wt::WTimer::singleShot </td>
          <td>(</td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>msec</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">T *&#160;</td>
          <td class="paramname"><em>receiver</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">void(V::*)()&#160;</td>
          <td class="paramname"><em>method</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td><code> [static]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>This static function calls a slot after a given time interval. </p>
<p>For example, the following code will call this-&gt;doSome() after 2 seconds: </p>
<div class="fragment"><pre class="fragment">   <a class="code" href="classWt_1_1WTimer.html#ac35c02164f78de697258197c5c9202c9" title="This static function calls a slot after a given time interval.">WTimer::singleShot</a>(2000, <span class="keyword">this</span>, &amp;MyClass::doSome);
</pre></div> 
</div>
</div>
<a class="anchor" id="ae0aa0f3402520831531f03f76056e63c"></a><!-- doxytag: member="Wt::WTimer::singleShot" ref="ae0aa0f3402520831531f03f76056e63c" args="(int msec, const F &amp;f)" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;class F &gt; </div>
      <table class="memname">
        <tr>
          <td class="memname">void Wt::WTimer::singleShot </td>
          <td>(</td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>msec</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const F &amp;&#160;</td>
          <td class="paramname"><em>f</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td><code> [static]</code></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>This static function calls a function after a given time interval. </p>
<p>This variant of the overloaded <a class="el" href="classWt_1_1WTimer.html#ac35c02164f78de697258197c5c9202c9" title="This static function calls a slot after a given time interval.">singleShot()</a> method supports a template function object (which supports operator ()). </p>

</div>
</div>
<a class="anchor" id="ae167fbd3eb981a2fce52e9a4b3b6e0af"></a><!-- doxytag: member="Wt::WTimer::start" ref="ae167fbd3eb981a2fce52e9a4b3b6e0af" args="()" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void Wt::WTimer::start </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>Starts the timer. </p>
<p>The timer will be <a class="el" href="classWt_1_1WTimer.html#aeabde106e48ea67e10c4043609b85493" title="Returns if the timer is running.">isActive()</a>, until either the interval has elapsed, after which the timeout signal is activated, or until <a class="el" href="classWt_1_1WTimer.html#a73c5d1b882af4835384ccdc07a650e34" title="Stops the timer.">stop()</a> is called. </p>

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<a class="anchor" id="a73c5d1b882af4835384ccdc07a650e34"></a><!-- doxytag: member="Wt::WTimer::stop" ref="a73c5d1b882af4835384ccdc07a650e34" args="()" -->
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          <td class="memname">void Wt::WTimer::stop </td>
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<p>Stops the timer. </p>
<p>You may stop the timer during its <a class="el" href="classWt_1_1WTimer.html#a2a66c6a51df2b0ab42258abf2ebd0399" title="Signal emitted when the timer timeouts.">timeout()</a>, or cancel a running timer at any other time.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WTimer.html#ae167fbd3eb981a2fce52e9a4b3b6e0af" title="Starts the timer.">start()</a> </dd></dl>

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<a class="anchor" id="a2a66c6a51df2b0ab42258abf2ebd0399"></a><!-- doxytag: member="Wt::WTimer::timeout" ref="a2a66c6a51df2b0ab42258abf2ebd0399" args="()" -->
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          <td class="memname"><a class="el" href="classWt_1_1EventSignal.html">EventSignal</a>&lt; <a class="el" href="classWt_1_1WMouseEvent.html">WMouseEvent</a> &gt; &amp; Wt::WTimer::timeout </td>
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<p>Signal emitted when the timer timeouts. </p>
<p>The WMouseEvent does not provide any meaningful information but is an implementation artefact. </p>

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