[Vala] [Genie] emulate a mouse click to trigger widget changes

[James Parkinson <jlp765 hotmail com>]

How do you signal another Widget, such as changing a NoteBook Tab when you select a menu item, especially 
when the widgets are defined in a glade xml file ?

In the example code, when you click the menu item, it calls on_menu_change_tab() as the action for that menu 
item.
How can this do the equivalent of  nbMain.set_current_page(4)  without causing a Segment fault on windoze ?




[indent=2]

uses Gtk

exception WinErr
   WinNameMissing

class MainGui : Gtk.Object
  prop  MainWin : Gtk.Window
  prop  nbMain  : Gtk.Notebook
  builder : private Gtk.Builder

  init
    var winXMLName = "window"
    var gladeFName = "mygui.glade"

    try
      builder = new Builder ()

      builder.add_from_file (gladeFName)

      builder.connect_signals (null)
      MainWin = (Gtk.Window) builder.get_object (winXMLName)
      if (MainWin.name != winXMLName) 
        raise new WinErr.WinNameMissing ("Window Glade definition for " + winXMLName + " is missing or failed 
to load!");

      MainWin.destroy.connect(Gtk.main_quit)  // ensure closes properly if NOT closed using the menu
      MainWin.show_all ()

      nbMain = (Gtk.Notebook) builder.get_object ("notebookMain")
      if (nbMain.name != "notebookMain") 
        raise new WinErr.WinNameMissing ("Window Glade definition for notebookMain is missing or failed to 
load!");

    except e:WinErr

      stderr.printf ("Could not load UI: %s\n", e.message)
    except e:Error  

      stderr.printf ("Could not load UI: %s\n", e.message)

  [CCode (cname="G_MODULE_EXPORT on_menu_change_tab")]
  def on_menu_change_tab () 
    stderr.printf ("on_menu_change_tab has been called!\n")
    change_the_tab_somehow()

                                          
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