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<page xmlns="http://projectmallard.org/1.0/"
xmlns:its="http://www.w3.org/2005/11/its"
xmlns:xi="http://www.w3.org/2001/XInclude"
type="guide" style="task"
id="combobox.py">
<info>
<title type="text">ComboBox (Python)</title>
<link type="guide" xref="beginner.py#menu-combo-toolbar"/>
<link type="seealso" xref="model-view-controller.py"/>
<link type="next" xref="treeview_simple_liststore.py"/>
<revision version="0.1" date="2012-06-02" status="draft"/>
<credit type="author copyright">
<name>Marta Maria Casetti</name>
<email its:translate="no">mmcasetti@gmail.com</email>
<years>2012</years>
</credit>
<desc>A widget used to choose from a list of items</desc>
</info>
<title>ComboBox (one column)</title>
<media type="image" mime="image/png" src="media/combobox.png"/>
<p>This ComboBox prints to the terminal your selection when you change it.</p>
<links type="section" />
<section id="code">
<title>Code used to generate this example</title>
<code mime="text/x-python" style="numbered"><xi:include href="samples/combobox.py" parse="text"><xi:fallback/></xi:include></code>
</section>
<section id="methods">
<title>Useful methods for a ComboBox widget</title>
<p>The ComboBox widget is designed around a <em>Model/View/Controller</em> design: the <em>Model</em> stores the data; the <em>View</em> gets change notifications and displays the content of the model; the <em>Controller</em>, finally, changes the state of the model and notifies the view of these changes. For more information and for a list of useful methods for ComboBox see <link xref="model-view-controller.py" />.</p>
<p>In line 35 the <code>"changed"</code> signal is connected to the callback function <code>on_changed()</code> using <code><var>widget</var>.connect(<var>signal</var>, <var>callback function</var>)</code>. See <link xref="signals-callbacks.py"/> for a more detailed explanation.</p>
</section>
<section id="references">
<title>API References</title>
<p>In this sample we used the following:</p>
<list>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkComboBox.html">GtkComboBox</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkListStore.html">GtkListStore</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkCellRendererText.html">GtkCellRendererText</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkCellLayout.html">GtkCellLayout</link></p></item>
<item><p><link href="http://git.gnome.org/browse/pygobject/tree/gi/overrides/Gtk.py">pygobject - Python bindings for GObject Introspection</link></p></item>
</list>
</section>
</page>
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