int main()
{
   key_press_event.connect((e) => {
      switch (e.keyval)
      {
      case Gdk.Key.@0:
         if ((e.state & Gdk.ModifierType.CONTROL_MASK) != 0)
         {
            action_zoom_default_font();
            return(true);
         }

         break;

      case Gdk.Key.@1:           //alt+[1-8]
      case Gdk.Key.@7:
      case Gdk.Key.@8:
         if (((e.state & Gdk.ModifierType.MOD1_MASK) != 0) && settings.alt_changes_tab)
         {
            var i = e.keyval - 49;
            if (i > notebook.n_tabs - 1)
            {
               return(false);
            }

            notebook.current = notebook.get_tab_by_index((int)i);
            return(true);
         }

         break;

      default:
         assert_not_reached();
      }

      return(false);
   });

   return(0);
}