如何从QGraphicsItem的上下文菜单中运行功能

Question

我试图像这样在我的QGraphicsItem子类中实现上下文菜单：

void ImagePixmapItem::right_clicked(){
    qDebug("Got here!");
}

void ImagePixmapItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event){
    QMenu menu;
    QAction *removeAction = menu.addAction("Remove");
    QAction *markAction = menu.addAction("Mark");
    QAction *selectedAction = menu.exec(event->screenPos());

    connect(selectedAction, SIGNAL(triggered()),this, SLOT(right_clicked()));
}

我在做什么错？文字“在这里！”永远不会被解雇，此外，我如何修改它以知道从菜单中选择了哪个操作？

感谢

Answer 1

当菜单对象超出范围时，将删除QMenu。

尝试一下：

void ImagePixmapItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
    std::auto_ptr<QMenu> menu(new QMenu(address_of_parent_widget));
    QAction *removeAction = menu->addAction("Remove");
    QAction *markAction = menu->addAction("Mark");
    QAction *selectedAction = menu->exec(event->screenPos());
    if ( selectedAction != 0 ) { 
        // see: http://doc.trolltech.com/4.3/qmenu.html#exec-2
        this->right_clicked();
    }
}