bool QDialog::eventFilter(QObject *target, QEvent *event)
{
    if (target == *SomeQGraphicsScene*)
    {
       if (event->type() == QEvent::GraphicsSceneWheel)
       {
           const QGraphicsSceneWheelEvent * const me = static_cast<const QGraphicsSceneWheelEvent*>(event);
           /* deal with me->delta() */
           return true;
        }
    }
    return false;
}