QMainWindows.md

在QMainWindows中动态增加控件

• Note: Creating a main window without a central widget is not supported. You must have a central widget even if it is just a placeholder.

    QWidget * centerWindow = new QWidget ;
    this->setCentralWidget(centerWindow);
    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addWidget(splitter);
    centerWindow->setLayout(mainLayout);
  

• 添加控件

    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
        , ui(new Ui::MainWindow)
    {
        ui->setupUi(this);
    
        QWidget * centerWindow = new QWidget ;
        this->setCentralWidget(centerWindow);
        QVBoxLayout *mainLayout = new QVBoxLayout;
    
        m_videoWidget = new QVideoWidget;
        mainLayout->addWidget(m_videoWidget);
        centerWindow->setLayout(mainLayout);
    
    
        m_mediaPlayer = new QMediaPlayer;
        m_mediaPlayer->setSource(QUrl("D:/Qt515/rxft.mp4"));
    
    
    
        m_mediaPlayer->setVideoOutput(m_videoWidget);
    
        //m_videoWidget->show();
        m_mediaPlayer->play();
    
    
    }