qwindowkit 基于MainWindow示例代码新增QVideoWidget后导致标题栏无法拖动窗口

After adding a QVideoWidget object to the QWKExample_MainWindow project, I encountered an issue where clicking and dragging the title bar does not move the window. The code is as follows:

MainWindow::MainWindow(QWidget *parent) 
: QMainWindow(parent), m_videoWidget(new QVideoWidget(this)), m_player(new QMediaPlayer(this)) {
    installWindowAgent();

    //auto clockWidget = new ClockWidget();
    //clockWidget->setObjectName(QStringLiteral("clock-widget"));
    //clockWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    //setCentralWidget(clockWidget);

    setCentralWidget(m_videoWidget);
    m_player->setVideoOutput(m_videoWidget);

    loadStyleSheet(Dark);

    setWindowTitle(tr("Example MainWindow"));
    resize(800, 600);
}

After invoking the QMediaPlayer::setVideoOutput interface, there are issues with the window's title bar area, as well as problems with window rendering. However, if you resize the window vertically by dragging the top or bottom borders, the mouse can once again move the window by dragging the title bar area. I encountered the same issue with a simple custom frameless window implementation I had developed earlier. I haven't identified the specific cause yet and hope you can provide a solution.

Jan 28 '24 12:01 LeoLei8060

I just tested the FramelessHelper library and found that adding QVideoWidget does not cause this issue. I'm curious about the differences in the underlying implementations of the two libraries.

Jan 28 '24 13:01 LeoLei8060

FramelessHelper has many workarounds but they are not quite related the "frameless" keyword, so we removed many of them in this new project. But some of them may fix some weird issues. And QVideoWidget internally is embeding a QWindow into the QWidget to display video images, this embeded QWindow may cause issues such as confuse our native event handling logic.