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virtual void removeItem(QGraphicsItem *item) = 0;
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virtual void deleteItem(QGraphicsItem *item);
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virtual void itemChange(const QGraphicsItem *item, QGraphicsItem::GraphicsItemChange, const QVariant &value);
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virtual void itemChange(const QGraphicsItem *item, QGraphicsItem::GraphicsItemChange, const void *const value);
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virtual void prepareBoundingRectChange(const QGraphicsItem *item);
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QGraphicsSceneIndex(QGraphicsSceneIndexPrivate &dd, QGraphicsScene *scene);