<?xml version='1.0' encoding='UTF-8'?>
<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="https://gitlab.gnome.org/GNOME/pygobject/blob/master/gi/overrides/Gtk.py">pygobject - Python bindings for GObject Introspection</link></p></item>
    </list>
  </section>
</page>
