Fullscreen QML application is flickering when hovering or pressing a button



  • I have a fullscreen QML application that should be displaying a dialog.
    Whenever I hover or click on a button the screen flickers like the graphics card was switching modes or something.
    This also happens with a demo application that is started standalone or with qmlscene.

    System: Qt 5.5.0 on Windows 7 SP1 x64 (and x86)

    main.qml:

    import QtQuick 2.4
    import QtQuick.Dialogs 1.2
    import QtQuick.Window 2.2
    import QtQuick.Controls 1.3
    
    ApplicationWindow {
        visible: true
        Rectangle {
            anchors.fill: parent
            Rectangle{
                width: 200
                height: 200
                color: "#00ff00"
                Button{
                    id: mouseArea
                    anchors.fill: parent
                    onClicked: {
                       messageDialog.show("Test")
                    }
                }
            }
        }
    
        MessageDialog {
            id: messageDialog
            title: qsTr("May I have your attention, please?")
    
            function show(caption) {
                messageDialog.text = caption;
                messageDialog.open();
            }
        }
    }
    

    Standalone the application is started using QQuickWindow->showFullScreen() (the same code that is used in qmlscene)

    How do I fix that flickering?
    As a workaround I currently have the application running frameless and 1px smaller in height than the screen. Then no flickering occurs, but this is not really what I want. Is there some hidden setting, that makes this work on windows? (Apparently this is a windows-only problem)



  • Hi,

    wie have the same issue. Anybody else having that issue and can provide a fix/solution/workaround?



  • @AndreasM
    can you try like this

    import QtQuick.Window 2.2
    ApplicationWindow{
        id:windows
        width: Screen.width
        height: Screen.height
    }
    


  • @vishnu
    This leads to the same situation. Qt or windows seems to recognize an application filling the complete screen and makes it fullscreen, if it is borderless. If it is not borderless this does not work as parts of the application go offscreen by the amount of pixels used by the top bar and borders.



  • @D.Fahsig
    I am not sure where is the error but it works for me .May be try reinstalling the Qt with necessary components may fix some times. Good luck
    FYI: i also Qt 5.5 on windows 7 64 bit.



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