virtual void onScrollOffsetChanged(qreal current, qreal previous);
virtual void onVisibleRolesChanged(const QList<QByteArray>& current, const QList<QByteArray>& previous);
virtual void onStyleOptionChanged(const KItemListStyleOption& current, const KItemListStyleOption& previous);
+ virtual void onSupportsItemExpandingChanged(bool supportsExpanding);
virtual void onTransactionBegin();
virtual void onTransactionEnd();
virtual void resizeEvent(QGraphicsSceneResizeEvent* event);