QPainter + QQuickFramebufferObject

[Tppo]

I asked allready here:
https://forum.qt.io/topic/74083/qpainter-qquickframebufferobject
but nobody answers me.

Is it possible to use QPainter with QQuickFramebufferObject or only with QQuickPaintedItem??? I was set renderTarget flag of QQuickPaintedItem to QQuickPaintedItem::FramebufferObject but updates still work very slow :(

Links:
https://dangelog.wordpress.com/2013/02/10/using-fbos-instead-of-pbuffers-in-qt-5-2/
http://doc.qt.io/qt-5/qtquick-scenegraph-textureinsgnode-example.html

[Tppo]

Or is there a way to draw just over QQuickView?

#include <QQuickView>
#include <QOpenGLContext>
#include <QOpenGLFramebufferObjectFormat>
#include <QOpenGLPaintDevice>
#include <QPainter>

class MyView : public QQuickView {
public:
    MyView() {
        setSurfaceType(QWindow::OpenGLSurface);
    }

protected:
    bool event(QEvent *ev) {
        bool result = QQuickView::event(ev);

// I don't know what type should be here
        if (ev->type() == QEvent::Expose /*?*/) {
            QOpenGLContext context;
            if (!context.create())
                qFatal("Cannot create the requested OpenGL context!");
            context.makeCurrent(this);

            const QRect drawRect(0, 0, 400, 400);
            const QSize drawRectSize = drawRect.size();

            QOpenGLFramebufferObjectFormat fboFormat;
            fboFormat.setSamples(16);
            fboFormat.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);

            QOpenGLFramebufferObject fbo(drawRectSize, fboFormat);
            fbo.bind();

            QOpenGLPaintDevice device(drawRectSize);
            QPainter painter;
            painter.begin(&device);
            painter.setRenderHints(QPainter::Antialiasing | QPainter::HighQualityAntialiasing);

            painter.fillRect(drawRect, Qt::blue);

            painter.end();

            fbo.release();
        }
        return result;
    }
};

Does anyone know what's wrong here?