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<!-- ##### SECTION Title ##### -->
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<!-- ##### SECTION Short_Description ##### -->
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A container which can hide its child
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<!-- ##### SECTION Long_Description ##### -->
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A #GtkExpander allows the user to hide or show its child by clicking
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on an expander triangle similar to the triangles used in a #GtkTreeView.
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Normally you use an expander as you would use any other descendant
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of #GtkBin; you create the child widget and use gtk_container_add()
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to add it to the expander. When the expander is toggled, it will take
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care of showing and hiding the child automatically.
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<section id="expander-special-usage">
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<title>Special Usage</title>
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There are situations in which you may prefer to show and hide the
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expanded widget yourself, such as when you want to actually create
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the widget at expansion time. In this case, create a #GtkExpander
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but do not add a child to it. The expander widget has an
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<literal>expanded</literal> property which can be used to monitor
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its expansion state. You should watch this property with a signal
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connection as follows:
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<programlisting id="expander-callback-example">
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expander = gtk_expander_new_with_mnemonic ("_More Options");
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g_signal_connect (expander, "notify::expanded",
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G_CALLBACK (expander_callback), NULL);
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expander_callback (GObject *object,
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GParamSpec *param_spec,
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GtkExpander *expander;
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expander = GTK_EXPANDER (object);
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if (gtk_expander_get_expanded (expander))
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/* Show or create widgets */
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/* Hide or destroy widgets */
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<refsect2 id="GtkExpander-BUILDER-UI">
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<title>GtkExpander as GtkBuildable</title>
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The GtkExpander implementation of the GtkBuildable interface
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supports placing a child in the label position by specifying
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"label" as the "type" attribute of a <child> element.
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A normal content child can be specified without specifying
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a <child> type attribute.
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<title>A UI definition fragment with GtkExpander</title>
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<programlisting><
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docs/reference/gtk/tmpl/gtkexpander.sgml
