Can't resize QWindow

  • I want to create a QWindow which size is 1920*1080 but I can't,the result is here
    alt text

    Here is my test code:

    #include <QGuiApplication>
    #include <QWindow>
    #include <QApplication>
    #include <QDesktopWidget>
    #include <QDebug>
    int main(int argc, char *argv[])
        QApplication a(argc, argv);
        QWindow win;
        qDebug()<<QString("The width of screen is %1 and height is %2").
        qDebug()<<QString("The width of QWindow is %1 and height is %2").
        qDebug()<<QString("The tolerance width of QWindow is %1 and height is %2").
        return a.exec();

    Who can tell me why I can't create a 1920*1080 QWindow?

  • Qt Champions 2017

    Your screen is not big enough.
    So window is re scaled to fit 1366x768
    setFixedSize(1920, 1080);

  • I use the subclass of QWindow rather than QWidget,so it didn't have a setFixedSize function...So using the subclass of QWidget is the only way to solve this problem?

  • Qt Champions 2017

    @MartinChan-0 said in Can't resize QWindow:


    I have not used QWindow as its used for openGL and native windows.
    If you need such features, QWidgets will not work.

    Why do u want the window to be bigger than the MAX screen ?

  • @mrjj
    Firstly,I find a easy way to solve this problem :-) ,you can set a minimum size of a QWindow use


    to set its size.

    Secondly, I use it because I want to generate a 1920*1080 picture ,and I have to use OpenGL to draw it (to do some job like anti-aliasing)

    Thank you @mrjj anyway~

  • Qt Champions 2017

    Ok, that way.
    Well then set Minimum should work just fine.

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