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<div class="title">Wt::Signal< A1, A2, A3, A4, A5, A6 > Class Template Reference<div class="ingroups"><a class="el" href="group__signalslot.html">Signal/slot system</a></div></div> </div>
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<!-- doxytag: class="Wt::Signal" --><!-- doxytag: inherits="Wt::SignalBase" -->
<p>A signal that propagates events to listeners.
<a href="classWt_1_1Signal.html#details">More...</a></p>
<p><code>#include <Wt/WSignal></code></p>
<div class="dynheader">
Inheritance diagram for Wt::Signal< A1, A2, A3, A4, A5, A6 >:</div>
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<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<p><a href="classWt_1_1Signal-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"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#aa481062b581f9d2f071bf07b421d87ca">Signal</a> (<a class="el" href="classWt_1_1WObject.html">WObject</a> *sender=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a signal. <a href="#aa481062b581f9d2f071bf07b421d87ca"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae665a336ae3e576bcb372f16c306d4d1"></a><!-- doxytag: member="Wt::Signal::~Signal" ref="ae665a336ae3e576bcb372f16c306d4d1" args="()" -->
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#ae665a336ae3e576bcb372f16c306d4d1">~Signal</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual boost::signals::connection </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a15d1150af031537b492674ee651bf4a3">connect</a> (<a class="el" href="classWt_1_1WObject.html">WObject</a> *target, <a class="el" href="classWt_1_1WObject.html#a6ef714d6ef0060b78c039e729b913aa9">WObject::Method</a> method)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects to a slot. <a href="#a15d1150af031537b492674ee651bf4a3"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class F > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">boost::signals::connection </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a43ead2fe014ed8440f7c0bc5bcb29dae">connect</a> (const F &function)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects to a function. <a href="#a43ead2fe014ed8440f7c0bc5bcb29dae"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class T , class V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">boost::signals::connection </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a46cb10dfd101afe7348601ebf447c4a8">connect</a> (T *target, void(V::*method)())</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects a slot that takes no arguments. <a href="#a46cb10dfd101afe7348601ebf447c4a8"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class T , class V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">boost::signals::connection </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#ad45227d4f4d12f82d31c6645a2a96c73">connect</a> (T *target, void(V::*method)(A1))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects a slot that takes one argument. <a href="#ad45227d4f4d12f82d31c6645a2a96c73"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class T , class V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">boost::signals::connection </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a04fc7780957c0f2f8cb069827c762e1b">connect</a> (T *target, void(V::*method)(A1, A2))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects a slot that takes two arguments. <a href="#a04fc7780957c0f2f8cb069827c762e1b"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class T , class V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">boost::signals::connection </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a55dc3c06b300a23894d6b1144607355b">connect</a> (T *target, void(V::*method)(A1, A2, A3))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects a slot that takes three arguments. <a href="#a55dc3c06b300a23894d6b1144607355b"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class T , class V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">boost::signals::connection </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a660092c952ff06430f59dc1d08107312">connect</a> (T *target, void(V::*method)(A1, A2, A3, A4))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects a slot that takes four arguments. <a href="#a660092c952ff06430f59dc1d08107312"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class T , class V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">boost::signals::connection </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a9e21c152582ceafa80715f8f56b2b199">connect</a> (T *target, void(V::*method)(A1, A2, A3, A4, A5))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects a slot that takes five arguments. <a href="#a9e21c152582ceafa80715f8f56b2b199"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class T , class V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">boost::signals::connection </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a6919b6294bab484324cb16e17c1ae6eb">connect</a> (T *target, void(V::*method)(A1, A2, A3, A4, A5, A6))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Connects a slot that takes six arguments. <a href="#a6919b6294bab484324cb16e17c1ae6eb"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a8d9cf8a1e83634462fe2b492b3beb1c5">emit</a> (A1 a1=NoClass::none, A2 a2=NoClass::none, A3 a3=NoClass::none, A4 a4=NoClass::none, A5 a5=NoClass::none, A6 a6=NoClass::none) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Emits the signal. <a href="#a8d9cf8a1e83634462fe2b492b3beb1c5"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a10c70ce5cafb6170e56e8df36bbb9a7a">operator()</a> (A1 a1=NoClass::none, A2 a2=NoClass::none, A3 a3=NoClass::none, A4 a4=NoClass::none, A5 a5=NoClass::none, A6 a6=NoClass::none) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Emits the signal. <a href="#a10c70ce5cafb6170e56e8df36bbb9a7a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Signal.html#a4a65919846e7d1cedabd0e9acc65563a">isConnected</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns whether this signal is connected. <a href="#a4a65919846e7d1cedabd0e9acc65563a"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><h3>template<typename A1 = NoClass, typename A2 = NoClass, typename A3 = NoClass, typename A4 = NoClass, typename A5 = NoClass, typename A6 = NoClass><br/>
class Wt::Signal< A1, A2, A3, A4, A5, A6 ></h3>
<p>A signal that propagates events to listeners. </p>
<p>Use Signal/slots to let one object (<em>A</em>) listen to events caused by another object (<em>B</em>). In this scenario, object <em>B</em> provides in its public interface access to a signal, to which object <em>A</em> connects one of its member function (which act as slot). Object <em>A</em> can then signal an event (which triggers the connected callback functions), by emitting the signal. Signal/slot is a generalization of the popular observer pattern used in GUIs.</p>
<p>A signal can provide details of the event, using up to 6 parameters. A slot must have a compatible signature to connect to a signal, based on its parameters. A compatible signature provides the same parameters in the member function, or less (leaving out parameters at the end).</p>
<p>The signal automatically disconnects from the slot when the target is deleted. In addition, the signal may be deleted at any time, in particular also while it is being emitted.</p>
<p>The Signal objects integrate with <a class="el" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system.">WObject</a> objects. A Signal requires that the target of a connection, i.e. the object that listens for an event, is a WObject. In addition, every signal may specify one WObject to be the owner of the signal, and a target may find out the sender of a signal emission, using <a class="el" href="classWt_1_1WObject.html#a413deb54de40ee278dd554e4960d58ca" title="Returns the sender of the current slot call.">WObject::sender()</a>.</p>
<div class="fragment"><pre class="fragment"> <span class="keyword">class </span>MyWidget : <span class="keyword">public</span> Wt::WContainerWidget
{
<span class="keyword">public</span>:
MyWidget(<a class="code" href="classWt_1_1WContainerWidget.html" title="A widget that holds and manages child widgets.">Wt::WContainerWidget</a> *parent = 0)
: Wt::WContainerWidget(parent),
done_(this)
{
...
<a class="code" href="classWt_1_1WPushButton.html" title="A widget that represents a push button.">Wt::WPushButton</a> *button = <span class="keyword">new</span> <a class="code" href="classWt_1_1WPushButton.html" title="A widget that represents a push button.">Wt::WPushButton</a>(<span class="stringliteral">"Okay"</span>);
button-><a class="code" href="classWt_1_1WInteractWidget.html#ae11e050cce0d4a8f742afa3ef92bfe8c" title="Event signal emitted when a mouse key was clicked on this widget.">clicked</a>().connect(<span class="keyword">this</span>, &MyWidget::process);
}
<span class="comment">// provide an accessor for the signal</span>
<a class="code" href="classWt_1_1Signal.html" title="A signal that propagates events to listeners.">Wt::Signal<int, std::string></a>& done() { <span class="keywordflow">return</span> done_; }
<span class="keyword">private</span>:
<a class="code" href="classWt_1_1Signal.html" title="A signal that propagates events to listeners.">Wt::Signal<int, std::string></a> done_;
<span class="keywordtype">void</span> process() {
...
done_.<a class="code" href="classWt_1_1Signal.html#a8d9cf8a1e83634462fe2b492b3beb1c5" title="Emits the signal.">emit</a>(42, <span class="stringliteral">"Totally done"</span>); <span class="comment">// emit the signal</span>
}
};
</pre></div><p>This widget could then be used from another class: </p>
<div class="fragment"><pre class="fragment"> <span class="keyword">class </span>GUIClass : <span class="keyword">public</span> Wt::WContainerWidget
{
...
<span class="keyword">private</span>:
<span class="keywordtype">void</span> init() {
MyWidget *widget = <span class="keyword">new</span> MyWidget(<span class="keyword">this</span>);
widget->done().connect(<span class="keyword">this</span>, &GUIClass::whenDone);
}
<span class="keywordtype">void</span> whenDone(<span class="keywordtype">int</span> result, <span class="keyword">const</span> std::string& description) {
...
}
};
</pre></div><p>The <a class="el" href="classWt_1_1WSignalMapper.html" title="A utility class to connect multiple senders to a single slot.">WSignalMapper</a> is a utility class that helps in situations where you want to connect multiple signals to a single slot, and still be identify the sender using some property.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WSignalMapper.html" title="A utility class to connect multiple senders to a single slot.">WSignalMapper</a> </dd></dl>
</div><hr/><h2>Constructor & Destructor Documentation</h2>
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<p>Creates a signal. </p>
<p>The <code>sender</code> is the object that will be identified as <a class="el" href="classWt_1_1WObject.html#a413deb54de40ee278dd554e4960d58ca" title="Returns the sender of the current slot call.">WObject::sender()</a> when executing connected slots may be passed as an argument.</p>
<p>The <code>sender</code> should not be <code>0</code> when you want to map the signal using the <a class="el" href="classWt_1_1WSignalMapper.html" title="A utility class to connect multiple senders to a single slot.">WSignalMapper</a>. </p>
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<hr/><h2>Member Function Documentation</h2>
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<p>Connects to a slot. </p>
<p>Every signal can be connected to a slot which does not take any arguments (and may thus ignore signal arguments). </p>
<p>Implements <a class="el" href="classWt_1_1SignalBase.html#a5161bdd49ba2dee3ddfa085c51e68bdb">Wt::SignalBase</a>.</p>
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<p>Connects to a function. </p>
<p>This variant of the overloaded <a class="el" href="classWt_1_1Signal.html#a15d1150af031537b492674ee651bf4a3" title="Connects to a slot.">connect()</a> method supports a template function object (which supports operator ()).</p>
<p>When the receiver function is an object method, the signal will automatically be disconnected when the object is deleted, as long as the object inherits from <a class="el" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system.">WObject</a> or boost::signals::trackable.</p>
<p>The function may leave up to <em>N</em> parameters unbound (e.g. using boost::bind placeholders _1 to _N) that may be bound to values passed by the signal. </p>
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<p>Connects a slot that takes no arguments. </p>
<p>This is always possible (even when the signal specifies a number of arguments).</p>
<p>The slot is as a <code>method</code> of an object <code>target</code> of class <code>T</code>, which equals class <code>V</code>, or is a base class of class <code>V</code>. Thus, the following statement must return a non-null pointer:</p>
<div class="fragment"><pre class="fragment"> V *v = <span class="keyword">dynamic_cast<</span>V *<span class="keyword">></span>(target);
</pre></div><p>In practice, to facilitate automatic disconnects on deletion of the <code>target</code>, class <code>T</code> must be also be a descendant of <a class="el" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system.">WObject</a>, but this is not enforced by the interface. </p>
<p>Reimplemented from <a class="el" href="classWt_1_1SignalBase.html#ae86c2d643c87d680390577882e7ee4ad">Wt::SignalBase</a>.</p>
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<p>Connects a slot that takes one argument. </p>
<p>This is only possible for signals that take at least one argument.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Signal.html#a15d1150af031537b492674ee651bf4a3" title="Connects to a slot.">connect</a>(T *target, void (V::*method)()) </dd></dl>
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<p>Connects a slot that takes two arguments. </p>
<p>This is only possible for signals that take at least two arguments.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Signal.html#a15d1150af031537b492674ee651bf4a3" title="Connects to a slot.">connect</a>(T *target, void (V::*method)()) </dd></dl>
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<p>Connects a slot that takes three arguments. </p>
<p>This is only possible for signals that take at least three arguments.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Signal.html#a15d1150af031537b492674ee651bf4a3" title="Connects to a slot.">connect</a>(T *target, void (V::*method)()) </dd></dl>
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<p>Connects a slot that takes four arguments. </p>
<p>This is only possible for signals that take at least four arguments.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Signal.html#a15d1150af031537b492674ee651bf4a3" title="Connects to a slot.">connect</a>(T *target, void (V::*method)()) </dd></dl>
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<p>Connects a slot that takes five arguments. </p>
<p>This is only possible for signals that take at least five arguments.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Signal.html#a15d1150af031537b492674ee651bf4a3" title="Connects to a slot.">connect</a>(T *target, void (V::*method)()) </dd></dl>
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<p>Connects a slot that takes six arguments. </p>
<p>This is only possible for signals that take at least six arguments.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Signal.html#a15d1150af031537b492674ee651bf4a3" title="Connects to a slot.">connect</a>(T *target, void (V::*method)()) </dd></dl>
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<p>Emits the signal. </p>
<p>The arguments must exactly match the arguments of the target function.</p>
<p>This will cause all connected slots to be triggered, with the given arguments. </p>
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<p>Returns whether this signal is connected. </p>
<p>Returns true when the signal was connected to to at least one slot. </p>
<p>Implements <a class="el" href="classWt_1_1SignalBase.html#a13a3106be8949b273edc74aa61be14ce">Wt::SignalBase</a>.</p>
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<p>Emits the signal. </p>
<p>This is equivalent to <a class="el" href="classWt_1_1Signal.html#a8d9cf8a1e83634462fe2b492b3beb1c5" title="Emits the signal.">emit()</a>.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1Signal.html#a8d9cf8a1e83634462fe2b492b3beb1c5" title="Emits the signal.">emit</a> </dd></dl>
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