Qt creator 创建鼠标右键菜单 (不新建类)

界面

步骤

1. 打开你的界面文件并选中你要添加右键的控件，选择“CustomContextMenu”

   

2. 右键选择“转到槽...” -> customContextMenuRequested
   
3. 插入下面代码即可

   void MainWindow::on_listWidget_customContextMenuRequested(const QPoint &pos)
   {
       static QMenu *qMenu = NULL;
       if (qMenu == NULL)
       {
           qMenu = new QMenu(ui->listWidget);
           QAction* closePaneAction = new QAction("&Close",this);
           connect(closePaneAction, SIGNAL(triggered()), this, SLOT(close()));
   
           qMenu->addAction(closePaneAction);
       }
   
       qMenu->exec(QCursor::pos()); //在鼠标点击的位置显示鼠标右键菜单
   }