static QGraphicsWidget *createItem(const QSizeF &minimum = QSizeF(100.0, 100.0), const QSizeF &preferred = QSize(150.0, 100.0), const QSizeF &maximum = QSizeF(200.0, 100.0), const QString &name = QString()) { QGraphicsWidget *w = new RectWidget; w->setMinimumSize(minimum); w->setPreferredSize(preferred); w->setMaximumSize(maximum); w->setData(0, name); return w; }