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Added a section about usage when you want to manage the expanded widgets

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2004-02-24  Federico Mena Quintero  <federico@ximian.com>

	* gtk/tmpl/gtkexpander.sgml: Added a section about usage when you
	want to manage the expanded widgets yourself.
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Federico Mena Quintero 2004-02-24 23:09:16 +00:00 committed by Federico Mena Quintero
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commit f65e2a2a1e
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5
docs/reference/ChangeLog
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@ -1,3 +1,8 @@
2004-02-24 Federico Mena Quintero <federico@ximian.com>
* gtk/tmpl/gtkexpander.sgml: Added a section about usage when you
want to manage the expanded widgets yourself.
Tue Feb 24 14:45:03 2004 Owen Taylor <otaylor@redhat.com>
* === Released 2.3.3 ===

50
docs/reference/gtk/tmpl/gtkexpander.sgml
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@ -10,6 +10,56 @@ A #GtkExpander allows the user to hide or show its child by clicking on an expan
the triangles used in a #GtkTreeView.
</para>
<para>
Normally you use an expander as you would use any other descendant
of #GtkBin; you create the child widget and use
gtk_container_add() to add it to the expander. When the expander
is toggled, it will take care of showing and hiding the child
automatically.
</para>
<section id="expander-special-usage">
<title>Special Usage</title>
<para>
There there are situations in which you may prefer to show and
hide the expanded widget yourself, such as when you want to
actually create the widget at expansion time. In this case,
create a #GtkExpander but do not add a child to it. The
expander widget has an <literal>expanded</literal> property
which can be used to monitor its expansion state. You should
watch this property with a signal connection as follows:
</para>
<programlisting id="expander-callback-example">
expander = gtk_expander_new_with_mnemonic ("_More Options");
g_signal_connect (expander, "notify::expanded",
G_CALLBACK (expander_callback), NULL);
...
static void
expander_callback (GObject *object,
GParamSpec *param_spec,
gpointer user_data)
{
GtkExpander *expander;
expander = GTK_EXPANDER (object);
if (gtk_expander_get_expanded (expander))
{
/* Show or create widgets */
}
else
{
/* Hide or destroy widgets */
}
}
</programlisting>
</section>
<!-- ##### SECTION See_Also ##### -->
<para>