QList <QGraphicsItem *>list = scene()->items(event->scenePos());
// only allow group move if we click over an item in the group
foreach(const QGraphicsItem *item, list) {
QList <QGraphicsItem *>list = scene()->items(event->scenePos());
// only allow group move if we click over an item in the group
foreach(const QGraphicsItem *item, list) {