Re: how to cancel an event?

[Carlo Agrusti <carlo-ag libero it>]

kyanh o2 pl ha scritto lo scorso 19/03/2005 16:03:
> Hi,
>
> please help me: for a special purpose, i want to ignore some events. For example, in my multiline text editor, the keys Key Up and Key Down must be ignored in some cases.
>
> I tried but failed. Thank you very much for replying.
You have to write your key_press_event callback, catch the event->keyval 
you wish to treat and stop the signal propagation; something like this:

gboolean on_tvShell_key_press_event (GtkWidget   * widget,
                                     GdkEventKey * event,
                                     gpointer      user_data)
{
  GtkTextBuffer * buffer;
  GtkWidget *     tvShell;
  gboolean        ret = FALSE;
						
  tvShell = lookup_widget (widget, "tvShell");
  buffer  = gtk_text_view_get_buffer (GTK_TEXT_VIEW (tvShell));
									
  switch (event->keyval) {
  case (GDK_Return):
    /* the return key has been hit - are you interested in it?
     */
    ret = FALSE;
    break;

  case (GDK_Up):
    /* the arrow-up key has been hit - let's drop this
     */
    g_signal_stop_emission_by_name (widget, "key-press");
    ret = TRUE;
    break;
  case (GDK_Down):
    ret = FALSE;
    break;
  case (GDK_Escape):
  .
  .
  .
  default:
    ret = FALSE;
    break;
  }
  return (ret);
}