I have a qt application which uses QGraphicsView and QGraphicsProxyWidget to rotate my widgets. Now I need to tell the system that my orientation has changed.
This can only be done by subclassing QWindow and do the following (view is a QWindow) [1]:

view.reportContentOrientationChange(Qt::LandscapeO rientation);
view.screen()->setOrientationUpdateMask(Qt::LandscapeOrientation );

QWindow is for me new so I was looking for an example and I found this [2].
Now I would like to know how to add widgets to this qwindow example.
I tried many things because I don't know a way to achieve this but was not successful.
Subclassing a qwindow is mostly done for gl or sdl stuff but not for widgets.

Qt Code: 
  1. #include <QtWidgets>
  2. class MyWindow: public QWindow
  3. {
  4. public:
  5.   MyWindow():
  6.   m_update_pending(false)
  7. {
  8.     m_backingStore = new QBackingStore(this);      
  9.     setTitle("QWindow Background Image");
  10.     resize(300,250);
  11. }
  12.  
  13. bool event(QEvent *event)
  14. {
  15.     if (event->type() == QEvent::UpdateRequest) 
  16.     {
  17.         m_update_pending = false;
  18.         renderNow();
  19.         return true;
  20.     }
  21.     return QWindow::event(event);
  22. }
  23.  
  24. void renderLater()
  25. {  
  26.     if (!m_update_pending) 
  27.     {
  28.         m_update_pending = true;
  29.  
  30. 	//Post this event to event queue for later processing
  31.         QCoreApplication::postEvent(this,
  32. 				    new QEvent(QEvent::UpdateRequest));
  33.     }
  34. }
  35.  
  36. void resizeEvent(QResizeEvent *resizeEvent)
  37. {
  38.     m_backingStore->resize(resizeEvent->size());
  39.     if (isExposed())
  40.     {
  41.         renderNow();
  42.     }
  43. }
  44.  
  45. void exposeEvent(QExposeEvent *)
  46. {
  47.     if (isExposed()) 
  48.     {
  49.         renderNow();
  50.     }
  51. }
  52.  
  53. void renderNow()
  54. {
  55.     if (!isExposed())
  56.         return;
  57.  
  58.     QRect rect(0, 0, width(), height());
  59.     m_backingStore->beginPaint(rect);
  60.  
  61.     QPaintDevice *device = m_backingStore->paintDevice();
  62.     QPainter painter(device);
  63.  
  64.     painter.drawPixmap(rect,QPixmap("background.jpg"));
  65.     painter.drawText(QRectF(0, 0, width(), height()),
  66. 		      Qt::AlignCenter, QStringLiteral("QWindow"));
  67.  
  68.     m_backingStore->endPaint();
  69.     m_backingStore->flush(rect);
  70. }
  71.  
  72. private:
  73.     QBackingStore *m_backingStore;
  74.     bool m_update_pending;
  75. };
  76.  
  77. int main(int argc, char *argv[])
  78. {
  79.     QApplication app(argc, argv);       
  80.  
  81.     MyWindow window;   
  82.     window.show();
  83.  
  84.     return app.exec();
  85. }
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Do I need to use a window container? What would be the best way? I have no clue, no starting point, I am lost.
I would be very happy if someone could make a small example showing a qpushbutton or some other widget on that window.
Other hints and tips are also welcome.

[1]:https://lists.sailfishos.org/piperma...ly/004833.html
[2]:http://codeprogress.com/cpp/librarie...ackgroundImage