QListWidget中右键单击Item出现菜单

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()));    

menu_white()和menu_black()是AddressbookWidget中的成员函数，这里面实现了右键单击菜单后点击菜单所要实现的功能（what to do....）。