QListWidget实现右键菜单

1.生成槽函数

在Qt Creator的UI设计器中右键QListWidget空间，选择”转到槽“，然后选择“customContextMenuRequested(Point)槽”。

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2.更改contextMenuPolicy属性

在QListWidget控件的属性栏内将contextMenuPolicy属性更改为CustomContextMenu。

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3.编辑槽函数

在源文件内找到生成的槽函数，添加一下代码：

	QMenu* popMenu=new QMenu(this);
    QAction* addMusic=new QAction("添加音乐",this);
    QAction* addFolder=new QAction("添加音乐文件夹",this);
    popMenu->addAction(addMusic);//在菜单中添加Action
    popMenu->addAction(addFolder);

 	connect(addMusic,SIGNAL(triggered()),this,SLOT(on_actionMusic_triggered()));//连接槽函数
    connect(addFolder,SIGNAL(triggered()),this,SLOT(on_actionDir_triggered()));

    popMenu->exec(QCursor::pos());//菜单出现在鼠标位置

    delete popMenu;
    delete addMusic;
    delete addFolder;