[Glade-users] Getting value from an option menu

[james cameron compaq com (James Cameron)]

Dean Schumacher wrote:
> And since Libglade is generating the interface from Glade's XML file,
> I don't have access to the menu items it creates to be able to connect
> signal handlers myself.

Yes you do.  The widget structure contains pointers to them.

Glade FAQ 4.7 ... it relates does it?

4.7 How do I get the value of a GtkOptionMenu?

Call gtk_menu_get_active() with the GtkOptionMenu's menu to get the
currently selected menu item. You can use g_list_index() to find its
index in the menu:

void
on_button1_clicked                     (GtkButton       *button,
                                        gpointer         user_data)
{
  GtkWidget *option_menu, *menu, *active_item;
  gint active_index;

  option_menu = lookup_widget (GTK_WIDGET (button), "optionmenu1");
  menu = GTK_OPTION_MENU (option_menu)->menu;
  active_item = gtk_menu_get_active (GTK_MENU (menu));
  active_index = g_list_index (GTK_MENU_SHELL (menu)->children,
active_item);

  g_print ("Active index: %i\n", active_index);
}


4.8 How do I get a GtkOptionMenu to call a function when it changes?

Glade doesn't support this at present, but you can set it up manually.

When you create the window, get the option menu and connect to the
"deactivate" signal emitted by its menu:

  window1 = create_window1 ();
  option_menu = lookup_widget (window1, "optionmenu1");
  gtk_signal_connect (GTK_OBJECT (GTK_OPTION_MENU (option_menu)->menu),
                      "deactivate", GTK_SIGNAL_FUNC
(on_option_selected),
                      NULL);


Then add a handler to callbacks.c. You can get the index of the selected
item just like the previous answer:

static void
on_option_selected (GtkMenuShell *menu_shell,
                    gpointer data)
{
  GtkWidget *active_item;
  gint item_index;
  
  active_item = gtk_menu_get_active (GTK_MENU (menu_shell));
  item_index = g_list_index (menu_shell->children, active_item);

  g_print ("In on_option_selected active: %i\n", item_index);
}

-- 
James Cameron                                      (cameron stl dec com)