How to update current QQuickItem's transform with c++?

[tracyma]

QQucikItem has a updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData * data) interface,
Can i use the data->transformNode as current item's transform?
i'am trying something like:

QSGNode *BaseItem::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData * data)
{
    QSGTransformNode *transformNode = data->transformNode;

    if ( move )
    {
        qDebug()<< "move...";
        QMatrix4x4 rotationMatrix;
        rotationMatrix.translate(width()/2, height()/2);
        rotationMatrix.rotate(20, QVector3D(0,0,1));
        rotationMatrix.translate(-width()/2, -height()/2);
        transformNode->setMatrix( rotationMatrix * transformNode->matrix() );
        transformNode->markDirty( QSGNode::DirtyMatrix );
    }

    return oldNode;
}

the item does not get rotated.

[tracyma]

ok, when i periodically call this->update() , it works