我的这个类名是AddressbookWidget继承自QWidget

重写void QWidget::contextMenuEvent ( QContextMenuEvent * event )   [virtual protected]

void AddressbookWidget::contextMenuEvent(QContextMenuEvent *){    QMenu *popMenu = new QMenu(personInfo_List);                 //菜单添加在personInfo_List这个对象里面    QAction *towhite = new QAction(tr("到白名单") , personInfo_List);						//右键显示的菜单    QAction *toblack = new QAction(tr("到黑名单") , personInfo_List);    connect(towhite , SIGNAL(triggered(bool)) , this , SLOT(menu_white()));    //右键菜单事件    connect(toblack , SIGNAL(triggered(bool)) , this , SLOT(menu_black()));    //右键菜单事件    if(personInfo_List->itemAt(mapFromGlobal(QCursor::pos())) != NULL)       //mapFromGlobal全局位置的映射    {        popMenu->addAction(towhite);																				 //将菜单标签加载上去显示        popMenu->addAction(toblack);    }    popMenu->exec(QCursor::pos()); //菜单出现的位置为当前鼠标的位置    delete popMenu;    delete towhite;    delete toblack;}

信号和槽的连接

connect(towhite , SIGNAL(triggered(bool)) , this , SLOT(menu_white()));    connect(toblack , SIGNAL(triggered(bool)) , this , SLOT(menu_black()));