QT DocketWidget

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    m_edit = new QTextEdit(this);
    setCentralWidget(m_edit);


    m_d1 = new QDockWidget("d1 dockwidget",this);
    m_d1->setAllowedAreas(Qt::LeftDockWidgetArea|Qt::RightDockWidgetArea);

    QListWidget* custom =  new QListWidget(m_d1);
    custom->addItems(QStringList()
                     << "aa"
                     << "bbb");
    m_d1->setWidget(custom);
    addDockWidget(Qt::LeftDockWidgetArea, m_d1);


    m_d2 = new QDockWidget("d2 dockwidget",this);
    m_d2->setAllowedAreas(Qt::LeftDockWidgetArea|Qt::RightDockWidgetArea);

    Form* f =  new Form(this);

    /*
    QListWidget* custom2 =  new QListWidget(m_d2);
    custom2->addItems(QStringList()
                     << "111"
                     << "222");
    m_d2->setWidget(custom2);*/
    m_d2->setWidget(f);
    addDockWidget(Qt::LeftDockWidgetArea, m_d2);


    QMenu *dockmenu = menuBar()->addMenu(tr("&Dock"));
#if 0
    QAction *dock1 = new QAction( tr("&Dock1 Show"), this);
    QAction *dock2 = new QAction(tr("&Dock2 Show"), this);

    dockmenu->addAction(dock1);
    dockmenu->addAction(dock2);

    connect(dock1,&QAction::triggered,[=](){
        m_d1->show();
        qDebug()<<"dock1";
    });
    connect(dock2,&QAction::triggered,[=](){
        m_d2->show();
         qDebug()<<"dock2";
    });
#else
    dockmenu->addAction(m_d1->toggleViewAction());
    dockmenu->addAction(m_d2->toggleViewAction());
#endif
}