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How to create a TransparentWindow, using Qt5, with QtQuick1



  • I'm now using Qt5, but for some reasons I want to use QtQuick1, because there are some problems in my program when using QtQuick2.(mainly because of OpenGL)

    But eventually I still faced problems using QtQuick1. If I set Qt::WA_TranslucentBackground to a QDeclarativeView, the program crashes when executing at app->exec(). My Code is:

    @
    #include <QtWidgets/QApplication>
    #include <QtDeclarative/qdeclarative.h>
    #include <QtDeclarative/qdeclarativeview.h>

    int main(int argc, char *argv[])
    {
    QScopedPointer<QApplication> app(new QApplication(argc, argv));

    QDeclarativeView view;
    view.setSource(QUrl::fromLocalFile("main.qml"));
    QPalette palette = view.palette();
    palette.setColor(QPalette::Base, Qt::transparent);
    view.setPalette(palette);
    //view.setStyleSheet("background:transparent"); //uncomment this line will make the whole window invisible
    //view.setAttribute(Qt::WA_TranslucentBackground); //uncomment this line will make the program crash
    view.setWindowFlags(Qt::FramelessWindowHint);

    view.show();

    return app->exec();
    }
    @

    And my QML file(main.qml):
    @
    import QtQuick 1.1

    Rectangle {
    width: 600
    height: 400
    color: "transparent"
    Image {
    source: "some_pic.png" //it is less than 600 * 400
    }
    }
    @

    My system is Win Xp. Similar code works well when I'm using Qt4.8..

    Any ideas? Thank you :)



  • I have test your example using Qt5 on Ubuntu, and I have no issue to compile and run such a implementation.
    @viewer.setStyleSheet("background:transparent");
    viewer.setAttribute(Qt::WA_TranslucentBackground);@
    are working fine for me.



  • What is we use QGLWidget as viewport. It will be failed


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