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<div class="chapter" lang="en">
<div class="titlepage"><div><div><h2 class="title">
<a name="gtk-migrating-GtkComboBox"></a>Migrating from GtkOptionMenu and GtkCombo to GtkComboBox and
GtkComboBoxEntry</h2></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="gtk-migrating-GtkComboBox.html#migrating-GtkOptionMenu">Migrating from GtkOptionMenu to GtkComboBox</a></span></dt>
<dt><span class="section"><a href="migrating-GtkCombo.html">Migrating from GtkCombo to GtkComboBoxEntry</a></span></dt>
<dt><span class="section"><a href="new-features-GtkComboBox.html">New features</a></span></dt>
</dl></div>
<p>
Prior to 2.4, GTK+ offered two widgets for the task of selecting one
item from a list of options. <a href="GtkOptionMenu.html" title="GtkOptionMenu"><span class="type">GtkOptionMenu</span></a> presents the list of
options as a menu while <a href="GtkCombo.html" title="GtkCombo"><span class="type">GtkCombo</span></a> presents them in a Windows-style list
popup. The only difference between the two is that a <a href="GtkCombo.html" title="GtkCombo"><span class="type">GtkCombo</span></a> allows to
manually edit the selected value, while the <a href="GtkOptionMenu.html" title="GtkOptionMenu"><span class="type">GtkOptionMenu</span></a> does not.
</p>
<p>
In GTK+ 2.4, a unified API for list selection was introduced, with
<a href="GtkComboBox.html" title="GtkComboBox"><span class="type">GtkComboBox</span></a> for the non-editable case and <a href="GtkComboBoxEntry.html" title="GtkComboBoxEntry"><span class="type">GtkComboBoxEntry</span></a> for the
editable case.
The selection of the display style — menu or list —
is no longer done at the API level, but has been made themeable via
the style property
GtkComboBox::appearance.
</p>
<div class="section" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="migrating-GtkOptionMenu"></a>Migrating from GtkOptionMenu to GtkComboBox</h2></div></div></div>
<p>
Here is an example of a simple, but typical use of
<span class="type">GtkOptionMenu:</span>
</p>
<div class="informalexample"><pre class="programlisting">
GtkWidget *option_menu, *menu, *menu_item;
option_menu = gtk_option_menu_new ();
menu = gtk_menu_new ();
menu_item = gtk_menu_item_new_with_label ("First Item");
gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);
gtk_widget_show (menu_item);
menu_item = gtk_menu_item_new_with_label ("Second Item");
gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);
gtk_widget_show (menu_item);
menu_item = gtk_menu_item_new_with_label ("Third Item");
gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);
gtk_widget_show (menu_item);
gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);
</pre></div>
<p>
In order to react to the user's selection, connect to the "changed"
signal on the option menu and use <a href="GtkOptionMenu.html#gtk-option-menu-get-history"><code class="function">gtk_option_menu_get_history()</code></a>
to retrieve the index of the selected item.
</p>
<p>
And here is how it would be done with a <span class="type">GtkComboBox:</span>
</p>
<div class="informalexample"><pre class="programlisting">
GtkWidget *combo_box;
combo_box = gtk_combo_box_new_text ();
gtk_combo_box_append_text (GTK_COMBO_BOX (combo_box), "First Item");
gtk_combo_box_append_text (GTK_COMBO_BOX (combo_box), "Second Item");
gtk_combo_box_append_text (GTK_COMBO_BOX (combo_box), "Third Item");
</pre></div>
<p>
In order to react to the user's selection, connect to the "changed"
signal on the combo box and use <a href="GtkComboBox.html#gtk-combo-box-get-active"><code class="function">gtk_combo_box_get_active()</code></a>
to retrieve the index of the selected item.
</p>
<p>
A slightly more complex example involving images:
</p>
<div class="informalexample"><pre class="programlisting">
GtkWidget *option_menu, *menu, *menu_item;
option_menu = gtk_option_menu_new ();
menu = gtk_menu_new ();
menu_item = gtk_image_menu_item_new_with_label ("First Item");
gtk_image_menu_item_set_image (gtk_image_new_from_pixbuf (pixbuf1));
gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);
gtk_widget_show (menu_item);
menu_item = gtk_image_menu_item_new_with_label ("Second Item");
gtk_image_menu_item_set_image (gtk_image_new_from_pixbuf (pixbuf2));
gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);
gtk_widget_show (menu_item);
menu_item = gtk_image_menu_item_new_with_label ("Third Item");
gtk_image_menu_item_set_image (gtk_image_new_from_pixbuf (pixbuf3));
gtk_menu_shell_append (GTK_MENU_SHELL (menu), menu_item);
gtk_widget_show (menu_item);
gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);
</pre></div>
<p>
</p>
<p>
can be done using a <a href="GtkComboBox.html" title="GtkComboBox"><span class="type">GtkComboBox</span></a> as follows:
</p>
<div class="informalexample"><pre class="programlisting">
GtkListStore *store;
GtkTreeIter iter;
GtkCellRenderer *renderer;
GtkWidget *combo_box;
store = gtk_list_store_new (2, GDK_TYPE_PIXBUF, G_TYPE_STRING);
gtk_list_store_append (store, &iter);
gtk_list_store_set (store, &iter, 0, pixbuf1, 1, "First Item", -1);
gtk_list_store_append (store, &iter);
gtk_list_store_set (store, &iter, 0, pixbuf2, 1, "Second Item", -1);
gtk_list_store_append (store, &iter);
gtk_list_store_set (store, &iter, 0, pixbuf3, 1, "Third Item", -1);
combo_box = gtk_combo_box_new_with_model (GTK_TREE_MODEL (store));
renderer = gtk_cell_renderer_pixbuf_new ();
gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (combo_box), renderer, FALSE);
gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (combo_box), renderer,
"pixbuf", 0,
NULL);
renderer = gtk_cell_renderer_text_new ();
gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (combo_box), renderer, TRUE);
gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (combo_box), renderer,
"text", 1,
NULL);
</pre></div>
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