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<a name="sec-menus-popup"></a>Popup Menus</h2></div></div></div>
<p>
<code class="classname">Menus</code> are normally just added to a window, but they can
also be displayed temporarily as the result of a mouse button click. For
instance, a context menu might be displayed when the user clicks their right
mouse button.
</p>
<p>For instance:
</p>
<pre class="programlisting">
Glib::ustring ui_info =
"<interface>"
" <menu id='menu-examplepopup'>"
" <section>"
" <item>"
" <attribute name='label' translatable='yes'>Edit</attribute>"
" <attribute name='action'>examplepopup.edit</attribute>"
" </item>"
" <item>"
" <attribute name='label' translatable='yes'>Process</attribute>"
" <attribute name='action'>examplepopup.process</attribute>"
" </item>"
" <item>"
" <attribute name='label' translatable='yes'>Remove</attribute>"
" <attribute name='action'>examplepopup.remove</attribute>"
" </item>"
" </section>"
" </menu>"
"</interface>";
m_refBuilder->add_from_string(ui_info);
Glib::RefPtr<Glib::Object> object = m_refBuilder->get_object("menu-examplepopup");
Glib::RefPtr<Gio::Menu> gmenu = Glib::RefPtr<Gio::Menu>::cast_dynamic(object);
m_pMenuPopup = new Gtk::Menu(gmenu);
</pre>
<p>
To show the popup menu, use <code class="classname">Gtk::Menu</code>'s
<code class="methodname">popup()</code> method, providing the button identifier and the
time of activation, as provided by the <code class="literal">button_press_event</code>
signal, which you will need to handle anyway. For instance:
</p>
<pre class="programlisting">
bool ExampleWindow::on_button_press_event(GdkEventButton* event)
{
if( (event->type == GDK_BUTTON_PRESS) && (event->button == 3) )
{
if(!m_pMenuPopup->get_attach_widget())
m_pMenuPopup->attach_to_widget(*this);
m_pMenuPopup->popup(event->button, event->time);
return true; //It has been handled.
}
else
return false;
}
</pre>
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