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<div class="sect1" title="Signals">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-signals-overview"></a>Signals</h2></div></div></div>
<p>
<span class="application">gtkmm</span>, like most GUI toolkits, is <span class="emphasis"><em>event-driven</em></span>. When an event occurs, such as the press of a mouse
button, the appropriate signal will be <span class="emphasis"><em>emitted</em></span> by the Widget
that was pressed. Each Widget has a different set of signals that it can emit. To make a
button click result in an action, we set up a
<span class="emphasis"><em>signal handler</em></span> to catch the button's "clicked" signal.
</p>
<p><span class="application">gtkmm</span> uses the libsigc++ library to implement signals. Here is an example line of code that connects a Gtk::Button's "clicked" signal with a signal handler called "on_button_clicked":
</p>
<pre class="programlisting">m_button1.signal_clicked().connect( sigc::mem_fun(*this,
&HelloWorld::on_button_clicked) );</pre>
<p>
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<p>For more detailed information about signals, see the <a class="link" href="chapter-signals.html" title="Appendix B. Signals">appendix</a>.</p>
<p>For information about implementing your own signals rather than
just connecting to the existing <span class="application">gtkmm</span> signals, see the <a class="link" href="chapter-custom-signals.html" title="Appendix C. Creating your own signals">appendix</a>.</p>
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