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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"><title>GtkExpander</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="GTK+ Reference Manual"><link rel="up" href="LayoutContainers.html" title="Layout Containers"><link rel="prev" href="GtkTable.html" title="GtkTable"><link rel="next" href="Ornaments.html" title="Ornaments"><meta name="generator" content="GTK-Doc V1.9 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="part" href="gtk.html" title="Part I. GTK+ Overview"><link rel="part" href="gtkbase.html" title="Part II. GTK+ Core Reference"><link rel="part" href="gtkobjects.html" title="Part III. GTK+ Widgets and Objects"><link rel="chapter" href="ch01.html" title="Object Hierarchy"><link rel="chapter" href="ch02.html" title="Widget Gallery"><link rel="chapter" href="WindowWidgets.html" 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height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GTK+ Reference Manual</th><td><a accesskey="n" href="Ornaments.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr><tr><td colspan="5" class="shortcuts"><nobr><a href="#id4107940" class="shortcut">Top</a>  |  <a href="#id4108626" class="shortcut">Description</a>  |  <a href="#id4108333" class="shortcut">Object Hierarchy</a>  |  <a href="#id4108394" class="shortcut">Implemented Interfaces</a>  |  <a href="#id4108424" class="shortcut">Properties</a>  |  <a href="#id4108546" class="shortcut">Style Properties</a>  |  <a href="#id4108597" class="shortcut">Signals</a></nobr></td></tr></table><div class="refentry" lang="en"><a name="GtkExpander"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><a name="id4107940"></a><span class="refentrytitle">GtkExpander</span></h2><p>GtkExpander — A container which can hide its child</p></td><td valign="top" align="right"></td></tr></table></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">#include <gtk/gtk.h> <a class="link" href="GtkExpander.html#GtkExpander-struct">GtkExpander</a>;<a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>* <a class="link" href="GtkExpander.html#gtk-expander-new">gtk_expander_new</a> (const <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar">gchar</a> *label);<a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>* <a class="link" href="GtkExpander.html#gtk-expander-new-with-mnemonic">gtk_expander_new_with_mnemonic</a> (const <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar">gchar</a> *label);void <a class="link" href="GtkExpander.html#gtk-expander-set-expanded">gtk_expander_set_expanded</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> expanded);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="GtkExpander.html#gtk-expander-get-expanded">gtk_expander_get_expanded</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander);void <a class="link" href="GtkExpander.html#gtk-expander-set-spacing">gtk_expander_set_spacing</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> spacing);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> <a class="link" href="GtkExpander.html#gtk-expander-get-spacing">gtk_expander_get_spacing</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander);void <a class="link" href="GtkExpander.html#gtk-expander-set-label">gtk_expander_set_label</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander, const <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar">gchar</a> *label);const <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar">gchar</a>* <a class="link" href="GtkExpander.html#gtk-expander-get-label">gtk_expander_get_label</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander);void <a class="link" href="GtkExpander.html#gtk-expander-set-use-underline">gtk_expander_set_use_underline</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> use_underline);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="GtkExpander.html#gtk-expander-get-use-underline">gtk_expander_get_use_underline</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander);void <a class="link" href="GtkExpander.html#gtk-expander-set-use-markup">gtk_expander_set_use_markup</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander, <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> use_markup);<ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> <a class="link" href="GtkExpander.html#gtk-expander-get-use-markup">gtk_expander_get_use_markup</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander);void <a class="link" href="GtkExpander.html#gtk-expander-set-label-widget">gtk_expander_set_label_widget</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander, <a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a> *label_widget);<a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>* <a class="link" href="GtkExpander.html#gtk-expander-get-label-widget">gtk_expander_get_label_widget</a> (<a class="link" href="GtkExpander.html" title="GtkExpander">GtkExpander</a> *expander);</pre></div><div class="refsect1" lang="en"><a name="id4108333"></a><h2>Object Hierarchy</h2><pre class="synopsis"> <ahref="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a> +----<ahref="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> +----<a class="link" href="GtkObject.html" title="GtkObject">GtkObject</a> +----<a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a> +----<a class="link" href="GtkContainer.html" title="GtkContainer">GtkContainer</a> +----<a class="link" href="GtkBin.html" title="GtkBin">GtkBin</a> +----GtkExpander</pre></div><div class="refsect1" lang="en"><a name="id4108394"></a><h2>Implemented Interfaces</h2><p>GtkExpander implements AtkImplementorIface and <a class="link" href="gtk-gtkbuildable.html#GtkBuildable">GtkBuildable</a>.</p></div><div class="refsect1" lang="en"><a name="id4108424"></a><h2>Properties</h2><pre class="synopsis"> "<a class="link" href="GtkExpander.html#GtkExpander--expanded">expanded</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> : Read / Write / Construct "<a class="link" href="GtkExpander.html#GtkExpander--label">label</a>" <ahref="/usr/share/gtk-doc/html/gobject/gobject-Standard-Parameter-and-Value-Types.html#gchararray">gchararray</a> : Read / Write / Construct "<a class="link" href="GtkExpander.html#GtkExpander--label-widget">label-widget</a>" <a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a> : Read / Write "<a class="link" href="GtkExpander.html#GtkExpander--spacing">spacing</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> : Read / Write "<a class="link" href="GtkExpander.html#GtkExpander--use-markup">use-markup</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> : Read / Write / Construct "<a class="link" href="GtkExpander.html#GtkExpander--use-underline">use-underline</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean">gboolean</a> : Read / Write / Construct</pre></div><div class="refsect1" lang="en"><a name="id4108546"></a><h2>Style Properties</h2><pre class="synopsis"> "<a class="link" href="GtkExpander.html#GtkExpander--expander-size">expander-size</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> : Read "<a class="link" href="GtkExpander.html#GtkExpander--expander-spacing">expander-spacing</a>" <ahref="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint">gint</a> : Read</pre></div><div class="refsect1" lang="en"><a name="id4108597"></a><h2>Signals</h2><pre class="synopsis"> "<a class="link" href="GtkExpander.html#GtkExpander-activate">activate</a>" : Run Last / Action</pre></div><div class="refsect1" lang="en"><a name="id4108626"></a><h2>Description</h2><p>A <a class="link" href="GtkExpander.html" title="GtkExpander"><span class="type">GtkExpander</span></a> allows the user to hide or show its child by clicking on an expander triangle similar to the triangles used in a <a class="link" href="GtkTreeView.html" title="GtkTreeView"><span class="type">GtkTreeView</span></a>.</p><p>Normally you use an expander as you would use any other descendantof <a class="link" href="GtkBin.html" title="GtkBin"><span class="type">GtkBin</span></a>; you create the child widget and use <a class="link" href="GtkContainer.html#gtk-container-add"><code class="function">gtk_container_add()</code></a> to add it to the expander. When the expander is toggled, it will take care of showing and hiding the child automatically.</p><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="expander-special-usage"></a>Special Usage</h2></div></div></div><p>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 <a class="link" href="GtkExpander.html" title="GtkExpander"><span class="type">GtkExpander</span></a> but do not add a child to it. The expander widget has an <code class="literal">expanded</code> property which can be used to monitor its expansion state. You should watch this property with a signal connection as follows:</p><a name="expander-callback-example"></a><pre class="programlisting">expander = gtk_expander_new_with_mnemonic ("_More Options");g_signal_connect (expander, "notify::expanded", G_CALLBACK (expander_callback), NULL);...static voidexpander_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 */ }}</pre></div><div class="refsect2" lang="en"><a name="GtkExpander-BUILDER-UI"></a><h3>GtkExpander as GtkBuildable</h3><p>The GtkExpander implementation of the GtkBuildable interface supports placing a child in the label position by specifying"label" as the "type" attribute of a <child> element.A normal content child can be specified without specifying a <child> type attribute.</p><div class="example"><a name="id4108754"></a><p class="title"><b>Example 37. A UI definition fragment with GtkExpander</b></p><div class="example-contents"><pre class="programlisting"><object class="GtkExpander"> <child type="label"> <object class="GtkLabel" id="expander-label"/> </child> <child> <object class="GtkEntry" id="expander-content"/> </child></object></pre></div></div><br class="example-break"></div></div><div class="refsect1" lang="en"><a name="id4108768"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id4108783"></a><h3><a name="GtkExpander-struct"></a>GtkExpander</h3><a class="indexterm" name="id4108796"></a><pre class="programlisting">typedef struct _GtkExpander GtkExpander;</pre><p></p></div><hr>⌨️ 快捷键说明
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