Trying to learn about GtkUIManager, and running into a strange
behavior. As an initial experiment, I'm trying to create a menu bar
containing only one menu, which in turn contains only one menu item.
This menu bar is the only element in my top-level window. The code (C+
+) is as follows:
int main (int argc, char* argv[]) {
gtk_init( &argc, &argv );
// Create top-level window and arrange to stop the program when
it closes.
GtkWidget* window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
g_signal_connect( window, "delete-event",
reinterpret_cast<GCallback>(closeMainWindow), NULL );
// Create the UIManager.
static const gchar* const menuDef =
"<ui>\
<menubar name=\"Menus\">\
<menu name=\"File\" action=\"FileMenuAct\">\
<menuitem name=\"Quit\" action=\"QuitAct\"> </
menuitem>\
</menu>\
</menubar>\
</ui>";
static const GtkActionEntry acts[] = { { "FileMenuAct", NULL,
"_File" },
{ "QuitAct", GTK_STOCK_QUIT, "_Quit", "<control>Q", "Exit this program",
reinterpret_cast<GCallback>(menuShutdown) } };
const guint nActs = 2;
GtkActionGroup* menuActions = gtk_action_group_new
( "MenuActions" );
gtk_action_group_add_actions( menuActions, acts, nActs, NULL );
GtkUIManager* menuManager = gtk_ui_manager_new();
gtk_ui_manager_insert_action_group( menuManager, menuActions, 0 );
GError* menuError = 0;
const guint mergeID = gtk_ui_manager_add_ui_from_string
( menuManager, menuDef, -1, &menuError );
if ( mergeID == 0 || menuError != 0 ) {
cerr << "Error: Failed to add menu definitions to menu UI
manager -- " << menuError->message << endl;
g_error_free( menuError );
}
gtk_ui_manager_ensure_update( menuManager );
GtkWidget* menuBar = gtk_ui_manager_get_widget( menuManager, "/
Menus" );
gtk_container_add( reinterpret_cast<GtkContainer*>(window),
menuBar );
// Make everything visible.
gtk_widget_show_all( window );
gtk_main();
return 0;
}
When I run this code, no window appears at all. If I remove the
"gtk_container_add" that adds the menu bar to the main window, the
program displays an empty window as I would expect it to. I'm using
GTk+2 2.6.10 on Mac OS X 10.4.11, running the above program under the
X11 that came with the Mac (which identifies itself as X11 1.1.3 -
XFree86 4.4.0). Does anyone have any thoughts about what I'm doing
wrong? Thanks.
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