MessageDialog

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void dialog_response (int response_id) {
	switch (response_id) {
		case Gtk.ResponseType.OK:
			print ("*boom*\n");
			break;
		case Gtk.ResponseType.CANCEL:
			print ("good choice\n");
			break;
		case Gtk.ResponseType.DELETE_EVENT:
			print ("dialog closed or cancelled\n");
			break;
	}

	Gtk.main_quit ();
}

int main (string[] args) {

	Gtk.init (ref args);

	var messagedialog = new Gtk.MessageDialog (null, Gtk.DialogFlags.MODAL, Gtk.MessageType.INFO, Gtk.ButtonsType.OK_CANCEL, "This action will cause the universe to stop existing.");

	messagedialog.response.connect (dialog_response);

 	messagedialog.show ();

	Gtk.main ();

	return 0;
}