Question

我正在尝试在我的QGraphicsItem子类中实现上下文菜单，如下所示：

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()));
}

我做错了什么？文字“到了！”永远不会被解雇，而且，如何修改它以了解从菜单中选择了哪个动作？

由于

Answer 1

离开范围时删除QMenu。

试试这个：

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();
    }
}

如何从QGraphicsItem中的上下文菜单运行函数

1 个答案: