In the next code ,i am trying to add action to the contextMenuEvent for a QGraphicsItem
but the problem is the slot "resize()" is never called
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;
}
Edit:: The header file of class "Rect"
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();
};
我的评论是正确的:你在课堂上错过了Q_OBJECT
宏。
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