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<title>Setting Up the Menu: Panel Applet Reference Manual</title>
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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="getting-started.context-menu.setup"></a>Setting Up the Menu</h2></div></div></div>
<p>
The only part of dealing with a context menu that is specific to applets is how to setup the context menu. Once it is setup, this is really just a matter of using <span class="type">GtkAction</span>.
</p>
<p>
To setup the context menu of the applet, the <a class="link" href="libpanel-applet-Panel-Applet.html#panel-applet-setup-menu-from-file" title="panel_applet_setup_menu_from_file ()"><code class="function">panel_applet_setup_menu_from_file()</code></a> function should be used, with a path to a <a class="link" href="getting-started.context-menu.html#getting-started.context-menu.xml-file" title="Menu XML File">menu XML file</a> and a <span class="type">GtkActionGroup</span> object containing all actions that are used in the menu XML file. The example below shows how to achieve this:
</p>
<div class="example">
<a name="id-1.3.5.4.4"></a><p class="title"><b>Example 3. Hello World applet, with a context menu</b></p>
<div class="example-contents">
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<td class="listing_code"><pre class="programlisting"><span class="gtkdoc ppc">#include <glib/gi18n.h></span>
<span class="gtkdoc ppc">#include <gtk/gtk.h></span>
<span class="gtkdoc ppc">#include <panel-applet.h></span>
<span class="comment">/* This would usually be defined in config.h */</span>
<span class="gtkdoc ppc">#define GETTEXT_PACKAGE</span> <span class="gtkdoc pps">"hello-world"</span><span class="gtkdoc ppc"></span>
<span class="comment">/* This would usually be defined in Makefile.am */</span>
<span class="gtkdoc ppc">#define HELLO_WORLD_UI_DIR</span> <span class="gtkdoc pps">"/usr/share/hello-world"</span><span class="gtkdoc ppc"></span>
<span class="gtkdoc kwb">static void</span> <span class="function">hello_world_applet_prefs</span> <span class="gtkdoc opt">(</span>GtkAction <span class="gtkdoc opt">*</span>action<span class="gtkdoc opt">,</span>
PanelApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">);</span>
<span class="gtkdoc kwb">static void</span> <span class="function">hello_world_applet_say</span> <span class="gtkdoc opt">(</span>GtkAction <span class="gtkdoc opt">*</span>action<span class="gtkdoc opt">,</span>
PanelApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">);</span>
<span class="gtkdoc kwb">static const</span> GtkActionEntry hello_world_menu_actions <span class="gtkdoc opt">[] = {</span>
<span class="gtkdoc opt">{</span> <span class="string">"HelloWorldPrefs"</span><span class="gtkdoc opt">,</span> GTK_STOCK_HELP<span class="gtkdoc opt">,</span> <span class="function"><a href="../glib/glib-I18N.html#N-:CAPS">N_</a></span><span class="gtkdoc opt">(</span><span class="string">"_Preferences"</span><span class="gtkdoc opt">),</span>
NULL<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">,</span>
<span class="function"><a href="../gobject/gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span> <span class="gtkdoc opt">(</span>hello_world_applet_prefs<span class="gtkdoc opt">) },</span>
<span class="gtkdoc opt">{</span> <span class="string">"HelloWorldSay"</span><span class="gtkdoc opt">,</span> GTK_STOCK_ABOUT<span class="gtkdoc opt">,</span> <span class="function"><a href="../glib/glib-I18N.html#N-:CAPS">N_</a></span><span class="gtkdoc opt">(</span><span class="string">"_Say Hello"</span><span class="gtkdoc opt">),</span>
NULL<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">,</span>
<span class="function"><a href="../gobject/gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span> <span class="gtkdoc opt">(</span>hello_world_applet_say<span class="gtkdoc opt">) }</span>
<span class="gtkdoc opt">};</span>
<span class="gtkdoc kwb">static void</span>
<span class="function">hello_world_applet_prefs</span> <span class="gtkdoc opt">(</span>GtkAction <span class="gtkdoc opt">*</span>action<span class="gtkdoc opt">,</span>
PanelApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
GtkWidget <span class="gtkdoc opt">*</span>dialog<span class="gtkdoc opt">;</span>
dialog <span class="gtkdoc opt">=</span> <span class="function"><a href="../gtk3/GtkMessageDialog.html#gtk-message-dialog-new">gtk_message_dialog_new</a></span> <span class="gtkdoc opt">(</span>NULL<span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span>
GTK_MESSAGE_INFO<span class="gtkdoc opt">,</span> GTK_BUTTONS_CLOSE<span class="gtkdoc opt">,</span>
<span class="string">"Preferences"</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="../gobject/gobject-Signals.html#g-signal-connect">g_signal_connect</a></span> <span class="gtkdoc opt">(</span>dialog<span class="gtkdoc opt">,</span> <span class="string">"response"</span><span class="gtkdoc opt">,</span>
<span class="function"><a href="../gobject/gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span> <span class="gtkdoc opt">(</span>gtk_widget_destroy<span class="gtkdoc opt">),</span> NULL<span class="gtkdoc opt">);</span>
<span class="function"><a href="../gtk3/GtkWidget.html#gtk-widget-show">gtk_widget_show</a></span> <span class="gtkdoc opt">(</span>dialog<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc kwb">static void</span>
<span class="function">hello_world_applet_say</span> <span class="gtkdoc opt">(</span>GtkAction <span class="gtkdoc opt">*</span>action<span class="gtkdoc opt">,</span>
PanelApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
GtkWidget <span class="gtkdoc opt">*</span>dialog<span class="gtkdoc opt">;</span>
dialog <span class="gtkdoc opt">=</span> <span class="function"><a href="../gtk3/GtkMessageDialog.html#gtk-message-dialog-new">gtk_message_dialog_new</a></span> <span class="gtkdoc opt">(</span>NULL<span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span>
GTK_MESSAGE_INFO<span class="gtkdoc opt">,</span> GTK_BUTTONS_CLOSE<span class="gtkdoc opt">,</span>
<span class="string">"Hello World!"</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="../gobject/gobject-Signals.html#g-signal-connect">g_signal_connect</a></span> <span class="gtkdoc opt">(</span>dialog<span class="gtkdoc opt">,</span> <span class="string">"response"</span><span class="gtkdoc opt">,</span>
<span class="function"><a href="../gobject/gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span> <span class="gtkdoc opt">(</span>gtk_widget_destroy<span class="gtkdoc opt">),</span> NULL<span class="gtkdoc opt">);</span>
<span class="function"><a href="../gtk3/GtkWidget.html#gtk-widget-show">gtk_widget_show</a></span> <span class="gtkdoc opt">(</span>dialog<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc kwb">static</span> gboolean
<span class="function">hello_world_applet_start</span> <span class="gtkdoc opt">(</span>PanelApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
GtkWidget <span class="gtkdoc opt">*</span>label<span class="gtkdoc opt">;</span>
GtkActionGroup <span class="gtkdoc opt">*</span>action_group<span class="gtkdoc opt">;</span>
gchar <span class="gtkdoc opt">*</span>ui_path<span class="gtkdoc opt">;</span>
label <span class="gtkdoc opt">=</span> <span class="function"><a href="../gtk3/GtkLabel.html#gtk-label-new">gtk_label_new</a></span> <span class="gtkdoc opt">(</span><span class="string">"Hello World"</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="../gtk3/GtkContainer.html#gtk-container-add">gtk_container_add</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_CONTAINER</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">),</span> label<span class="gtkdoc opt">);</span>
action_group <span class="gtkdoc opt">=</span> <span class="function"><a href="../gtk3/GtkActionGroup.html#gtk-action-group-new">gtk_action_group_new</a></span> <span class="gtkdoc opt">(</span><span class="string">"Hello World Applet Actions"</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="../gtk3/GtkActionGroup.html#gtk-action-group-set-translation-domain">gtk_action_group_set_translation_domain</a></span> <span class="gtkdoc opt">(</span>action_group<span class="gtkdoc opt">,</span> GETTEXT_PACKAGE<span class="gtkdoc opt">);</span>
<span class="function"><a href="../gtk3/GtkActionGroup.html#gtk-action-group-add-actions">gtk_action_group_add_actions</a></span> <span class="gtkdoc opt">(</span>action_group<span class="gtkdoc opt">,</span>
hello_world_menu_actions<span class="gtkdoc opt">,</span>
<span class="function"><a href="../glib/glib-Standard-Macros.html#G-N-ELEMENTS:CAPS">G_N_ELEMENTS</a></span> <span class="gtkdoc opt">(</span>hello_world_menu_actions<span class="gtkdoc opt">),</span>
applet<span class="gtkdoc opt">);</span>
ui_path <span class="gtkdoc opt">=</span> <span class="function"><a href="../glib/glib-Miscellaneous-Utility-Functions.html#g-build-filename">g_build_filename</a></span> <span class="gtkdoc opt">(</span>HELLO_WORLD_UI_DIR<span class="gtkdoc opt">,</span> <span class="string">"hello-world-menu.xml"</span><span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
<span class="function"><a href="libpanel-applet-Panel-Applet.html#panel-applet-setup-menu-from-file">panel_applet_setup_menu_from_file</a></span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">,</span> ui_path<span class="gtkdoc opt">,</span> action_group<span class="gtkdoc opt">);</span>
<span class="function"><a href="../glib/glib-Memory-Allocation.html#g-free">g_free</a></span> <span class="gtkdoc opt">(</span>ui_path<span class="gtkdoc opt">);</span>
<span class="function"><a href="../gobject/gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span> <span class="gtkdoc opt">(</span>action_group<span class="gtkdoc opt">);</span>
<span class="function"><a href="../gtk3/GtkWidget.html#gtk-widget-show-all">gtk_widget_show_all</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_WIDGET</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">));</span>
<span class="keyword">return</span> TRUE<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc kwb">static</span> gboolean
<span class="function">hello_world_factory_callback</span> <span class="gtkdoc opt">(</span>PanelApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">,</span>
<span class="gtkdoc kwb">const</span> gchar <span class="gtkdoc opt">*</span>iid<span class="gtkdoc opt">,</span>
gpointer data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
gboolean retval <span class="gtkdoc opt">=</span> FALSE<span class="gtkdoc opt">;</span>
<span class="keyword">if</span> <span class="gtkdoc opt">(</span><span class="function"><a href="../glib/glib-String-Utility-Functions.html#g-strcmp0">g_strcmp0</a></span> <span class="gtkdoc opt">(</span>iid<span class="gtkdoc opt">,</span> <span class="string">"HelloWorldApplet"</span><span class="gtkdoc opt">) ==</span> <span class="number">0</span><span class="gtkdoc opt">)</span>
retval <span class="gtkdoc opt">=</span> <span class="function">hello_world_applet_start</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">);</span>
<span class="keyword">return</span> retval<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="function">PANEL_APPLET_OUT_PROCESS_FACTORY</span> <span class="gtkdoc opt">(</span><span class="string">"HelloWorldFactory"</span><span class="gtkdoc opt">,</span>
PANEL_TYPE_APPLET<span class="gtkdoc opt">,</span>
hello_world_factory_callback<span class="gtkdoc opt">,</span>
NULL<span class="gtkdoc opt">)</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>
Here are the changes compared to the <a class="link" href="getting-started.example.html#getting-started.example.simple" title="Example 1. Hello World applet">simple example</a> with no context menu:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
We define a list of <span class="type">GtkActionEntry</span> entries: <code class="constant">hello_world_menu_actions</code>. This will be used later on to build <span class="type">GtkAction</span> objects, with their label and callback. We obviously implement the callbacks.
</p></li>
<li class="listitem"><p>
We change <code class="function">hello_world_applet_start()</code> to define a <span class="type">GtkActionGroup</span> object, to which we add, with <code class="function">gtk_action_group_add_actions()</code>, <span class="type">GtkAction</span> objects based on the <span class="type">GtkActionEntry</span> entries. Note that the the last argument to <code class="function">gtk_action_group_add_actions()</code> will be passed as user data to the callbacks.
</p></li>
<li class="listitem"><p>
We also change <code class="function">hello_world_applet_start()</code> to add this <span class="type">GtkActionGroup</span> object to the context menu of the applet, by calling <a class="link" href="libpanel-applet-Panel-Applet.html#panel-applet-setup-menu-from-file" title="panel_applet_setup_menu_from_file ()"><code class="function">panel_applet_setup_menu_from_file()</code></a>. This function takes as argument a path to the <a class="link" href="getting-started.context-menu.html#getting-started.context-menu.xml-file" title="Menu XML File">menu XML file</a> that will define how to display the <span class="type">GtkAction</span> objects in the context menu.
</p></li>
</ul></div>
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