QDockWidget

QDockWidget *dock = new QDockWidget(tr("Customers"), this);
//1.设置停靠区域
dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
//2.创建dock内的widget
QListWidget *customerList = new QListWidget(dock);
customerList->addItems( QStringList()<<"Item1"<<"Item2" );
//3.设置widget
dock->setWidget(customerList);
//4.mainwindow添加dock控件
addDockWidget(Qt::RightDockWidgetArea, dock);