QT关于QGraphicsItem的问题?
Warning::Class Butterfly imlements the interface QGraphicsItem but does not list it in Q_INTERFACES ;qobject_cast to QGraphicsItem will not work
[解决办法]
能不能贴出你的关键代码
[解决办法]
QGraphicsItem的paint方法是在item被重绘时调用的,除了调用这个接口函数外,他还需要调用另外几个接口函数,你是不是在类中没有写呀?
需要添加的函数列表:
QRectF boundingRect() const;
QPainterPath shape() const;
virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *item, QWidget *widget);
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
void hoverEnterEvent(QGraphicsSceneHoverEvent * event);
void hoverLeaveEvent(QGraphicsSceneHoverEvent * event);