Re: Adding a user signal to a widget

[Hans Oesterholt <hdnews gawab com>]

Thanks for the example.
I've integrated this code in mzgtk2. My derived text-view
class now supports undo.

Best whishes,
Hans



Olexiy Avramchenko schreef:

> Hans Oesterholt wrote:
>
> > Can anyone tell me how to add a user signal of type G_RUN_ACTION to a 
> > widget?
> > - I can't find G_RUN_ACTION in any header file I have.
>
> Use G_SIGNAL_ACTION instead. There was a type in the reference, as I 
> remember.
>
> > - I can't find |gtk_object_class_user_signal_new |in any header file 
> > I have.
>
> It's from gtk+-1.2, use g_signal_new() in GTK2.
>
> The following defines new signal for GtkWindow class with 
> G_SIGNAL_ACTION flag:
>
> -- C
> #include <gtk/gtk.h>
>
> static void
> catcher ()
> {
>   g_print ("signal catched\n");
> }
>
> static void
> emitter (GtkWidget * window)
> {
>   g_signal_emit_by_name (window, "user-signal");
> }
>
> int
> main (int argc, char **argv)
> {
>   GtkWidget *window;
>   GtkWidget *button;
>
>   gtk_init (&argc, &argv);
>
>   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>   gtk_container_set_border_width (GTK_CONTAINER (window), 6);
>   g_signal_connect (window, "delete-event", G_CALLBACK 
> (gtk_main_quit), 0);
>
>   g_signal_new ("user-signal",
>                 gtk_window_get_type (),
>                 G_SIGNAL_ACTION,
>                 0,
>                 NULL, NULL,
>                 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0
>   );
>   g_signal_connect (window, "user-signal", G_CALLBACK (catcher), 0);
>
>   button = gtk_button_new_with_label ("emit");
>   g_signal_connect_swapped (button, "clicked", G_CALLBACK (emitter), 
> window);
>
>   gtk_container_add (GTK_CONTAINER (window), button);
>
>   gtk_widget_show_all (window);
>
>   gtk_main ();
>
>   return 0;
> }
> -- C
>
>     Olexiy