VirtualKeyboard unusable on fullscreen windows 10 QQuick app

miguel.angel.orenes

Environment:

Windows 10
Qt5.9.3 MSVC2015 32bit
QCoreApplication configured with AA_UseDesktopOpenGL because of performance matters.
Tablet mode on/off (I can see the issue on both modes)
Touch actions, the issue is not reproducible by mouse events

Problem:
I have a very simple application that on fullscreen where the VirtualKeyboard is unusable:

int main(int argc, char *argv[])
{
    qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
    QCoreApplication::setAttribute(Qt::AA_UseDesktopOpenGL);

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

ApplicationWindow {
    id: mainWindow
    visible: true
    width: 800
    height: 600
    visibility: "FullScreen"
    flags: Qt.Window

    Row{
        TextField{
            text: "Texto 1"
        }
        Button{
            text: "exit"
            onClicked: Qt.quit();
        }
    }

    InputPanel {
        id: inputPanel
        width: mainWindow.width / 2
        x: (mainWindow.width - width) / 2
        y: mainWindow.height

        states: State {
            name: "visible"
            when: inputPanel.active
            PropertyChanges {
                target: inputPanel
                y: mainWindow.height - inputPanel.height
            }
        }
    }
}

When I am selecting the TextField, virtual keyboard appears properly but it is unusable.

I have been playing with the problem and it is provoked because of "windows osk(tabtip)" is launched, but I cannot see because my app is on top, and the "windows osk" is capturing the events.

As more information, If I do not set the AA_UseDesktopOpenGL attribute, just leaving the default one, I can see "Windows osk" over my fullscreen window.

Is there a way to disable the "windows OSK" auto-launch when selecting a text field?
Did anyone see this behaviour before?

Regards.

bokki

Same here!
Weird thing is that in one part of my application, the Qt Virtual Keyboard is functioning properly and in the other part not: When clicking on a QLineEdit, the Virtual Keyboard is shown, but when clicking on the Virtual Keyboard's buttons, there is no response. Even the Caps lock functionality also doesn't work.

Did you find a fix for this yet?