static gint
gtk_my_draw_widget_button_updown (GtkWidget *widget, GdkEventButton *event)
{
  GtkMyDrawWidget * mdw;
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MY_DRAW_WIDGET (widget), FALSE);
  mdw = GTK_MY_DRAW_WIDGET (widget);

  double pressure;
  if (!gdk_event_get_axis ((GdkEvent *)event, GDK_AXIS_PRESSURE, &pressure)) {
    pressure = (event->state & GDK_BUTTON1_MASK) ? 0.5 : 0;
  }

  if (event->state & GDK_BUTTON1_MASK)
    gtk_my_draw_widget_process_motion_or_button (widget, event->time, event->x, event->y, 0);

  gtk_my_draw_widget_process_motion_or_button (widget, event->time, event->x, event->y, pressure);

  if ((event->state & GDK_BUTTON1_MASK) == 0)
    gtk_my_draw_widget_process_motion_or_button (widget, event->time, event->x, event->y, 0);

  return TRUE;
}