[Development] QML: Event which triggers after document was fully loaded

[Ruslan Moukhlynin]

Hello all!
I'm working now at application which loads QML from a string and make 
screenshot of a window.
And I'm surprised that there is no event which triggers when document 
was completly loaded;
I talk about C++ part only.

The simple example:

QByteArray data("import QtQuick 2.3\n\
import QtQuick.Window 2.2\n\
\n\
Window {\n\
visible: true\n\
     width: 360\n\
     height: 360\n\
     Text {\n\
         anchors.centerIn: parent\n\
         text: \"Hello, world!\"\n\
     }\n\
}\n\");

QQmlApplicationEngine engine;
engine.loadData(data);
QQuickWindow *rootObject = qobject_cast<QQuickWindow 
*>(engine.rootObjects().first());

connect(rootObject,&QQuickWindow::afterRendering,[=] () {
     QImage image = rootObject->grabWindow();
     image.save("window.png","PNG",90);
});

The execution hungs up on grabWindow(). All other events from 
QQuickWindow also not works.

I was surpised again when tried to call grabWindow() from QML through 
singleton:

Window {
     ....
     Component.onCompleted: someSingleton.makeScreenshot();
     ....
}

It makes the image but text was not centered. It says that document was 
not really completed yet! Or not?

So I came to conclusion that there is no way to know that a QML data was 
loaded.

/P.S. Sorry for asking this question in development mail list but I've 
asked it in all other places. It look that only Qt developers //can 
clarify////this question./
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