中的QGraphicsItem

Question

連接專用插槽到的QAction在接下來的代碼中，我試圖添加動作到的ContextMenuEvent一個的QGraphicsItem

但問題是槽「調整（）」是從來沒有所謂

void Rect::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) 
{ 
    QMenu * menu = new QMenu(); 
     QAction *resizeAction = menu->addAction("Resize?"); 
     connect(resizeAction, SIGNAL(triggered()), this, SLOT(resize())); 
     menu->exec(event->screenPos()); 
     delete menu; 

} 

編輯:: 類「矩形」的頭文件

class Rect: public QObject,public QGraphicsItem 
    { 

    public: 
     enum { Type = UserType + 4 }; 
     Rect(int x,int y,QString s,QColor myRectangleColor, 
      QGraphicsItem *parent = 0, QGraphicsScene *scene = 0); 
     Rect(); 
     int type() const 
     { return Type; } 
     QPainterPath shape() const; 
     QRectF my_rect; 

     virtual QRectF boundingRect() const; 
     virtual void paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget); 

    protected: 

     virtual void mouseMoveEvent (QGraphicsSceneMouseEvent * event) 
     virtual void mousePressEvent (QGraphicsSceneMouseEvent * event); 
     virtual void mouseReleaseEvent (QGraphicsSceneMouseEvent * event); 

     virtual void mouseMoveEvent(QGraphicsSceneDragDropEvent *event); 
     virtual void mousePressEvent(QGraphicsSceneDragDropEvent *event); 
     virtual bool sceneEventFilter (QGraphicsItem * watched, QEvent * event) ; 
     virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent *event); 


    private: 
     private slots: 
     void resize(); 
     void MoveUpFun(); 
    }; 

Answer 1

我是對我的評論：你錯過了你們班Q_OBJECT宏。