Re: casting Gtk::UIManager::get_widget()

["Paul Davis" <pjdavis engineering uiowa edu>]

Sergio,

The reason you're getting errors is because the widget being returned
isn't a CheckButton, its a CheckMenuItem or CheckMenuElem or
something. When doing things like this, I work with the actions
though. Something like this:

Glib::RefPtr< Gtk::Action > act = _ui_manager->get_action( actionName ) ;
Glib::RefPtr< Gtk::ToggleAction > tact =
               Glib::RefPtr< Gtk::ToggleAction >::cast_dynamic( act ) ;

if( tact->get_active() )
{
   //do something
}

HTH,
Paul Davis

On 4/28/07, Sergio Perticone <g4ll0ws gmail com> wrote:
> Hi,
> I've a menu with a checkbutton, how can I check if is it active?
>
> I've tried this way:
>
> void Window::f()
> {
>         Gtk::CheckButton* pCheck =
> static_cast<Gtk::CheckButton*>(refUIManager->get_widget("/Where/Is/CheckButton"));
>
>         if(pCheck && pCheck->get_active()) {
>                // ...
>         }
> }
>
> But at runtime I get this message:
> Gtk-CRITICAL **: gtk_toggle_button_get_active: assertion
> `GTK_IS_TOGGLE_BUTTON (toggle_button)' failed
>
> I've also tried dynamic_cast<>() but `pCheck' becomes NULL.
>
> Thanks,
>
> s.
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