QT-QML application: QQuickWindow to Full Screen: repaint failure ("bad window" in top

[ddonate]

Hi,

I have a Qt/QML application and I have a problem when setting the main window to Full Screen.

It goes Full Screen, but first it seems to be moved to the top-left corner of my screen. Then it changes to Full Screen, BUT this top-left window is there until I repaint my application. For instance, moving it to background and to foreground again.

I hope I am explaining properly...

In my code, I have a QWidget class where I create a QQmlApplicationEngine:

.h file:

QQmlApplicationEngine* m_pAppMainWindow;
    QQuickWindow* m_pQuickWindow;

QQmlApplicationEngine* m_pAppMainWindow;
    QQuickWindow* m_pQuickWindow;

To copy to clipboard, switch view to plain text mode 

.cpp file:

m_pAppMainWindow = new QQmlApplicationEngine();

m_pAppMainWindow = new QQmlApplicationEngine();

To copy to clipboard, switch view to plain text mode 

I use it to get app qml context

QQmlContext* pQmlContext = m_pAppMainWindow->rootContext();

QQmlContext* pQmlContext = m_pAppMainWindow->rootContext();

To copy to clipboard, switch view to plain text mode 

to load the main QML file from resources:

m_pAppMainWindow->load(QUrl("qrc:/qml/ViewMain.qml"));

m_pAppMainWindow->load(QUrl("qrc:/qml/ViewMain.qml"));

To copy to clipboard, switch view to plain text mode 

to set Image providers:

m_pAppMainWindow->addImageProvider(...);

m_pAppMainWindow->addImageProvider(...);

To copy to clipboard, switch view to plain text mode 

and to get QQuickWindow object:

m_pQuickWindow = m_pQuickWindow = qobject_cast<QQuickWindow *>(m_pAppMainWindow->rootObjects()[0]);

m_pQuickWindow = m_pQuickWindow = qobject_cast<QQuickWindow *>(m_pAppMainWindow->rootObjects()[0]);

To copy to clipboard, switch view to plain text mode 

I use the QQuickWindow object to set app window minimum size:

m_pQuickWindow->setMinimumWidth(...)

m_pQuickWindow->setMinimumWidth(...)

To copy to clipboard, switch view to plain text mode 

to get the QML objects to work with:

QObject* pObjViewMain = m_pQuickWindow->findChild<QObject*>("viewMain");

QObject* pObjViewMain = m_pQuickWindow->findChild<QObject*>("viewMain");

To copy to clipboard, switch view to plain text mode 

and to set app in full screen mode (on/off):

m_pQuickWindow->showFullScreen();
or 
m_pQuickWindow->showNormal();

m_pQuickWindow->showFullScreen();
or 
m_pQuickWindow->showNormal();

To copy to clipboard, switch view to plain text mode 

My problem is with this last point, when I enter Full Screen...

Hope anyone can help me

Thanks