Qt中右键菜单的生成方式:contextMenuEvent

实现protected contextMenuEvent函数

void MyItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
    QMenu menu;
    QAction *moveAction = menu.addAction("move back");
    QAction *actAction = menu.addAction("test");
    QAction *selectedAction = menu.exec(event->screenPos());
    if(selectedAction == moveAction) {
        setPos(0, 0);
    }
}