[Interest] QML: onLoaded signal for QQuickWindow or QQmlApplicationEngine

[ruslan]

Hello all!
Is there any way to know when QML data was loaded into engine?
In my QML app I want to make a screenshot after all the source was loaded.

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

QImage image = rootObject->grabWindow();
image.save("window.png","PNG",90);


where data is simple QML file:

import QtQuick 2.3
import QtQuick.Window 2.2

Window {
    visible: true
    width: 360
    height: 360

    Text {
        anchors.centerIn: parent
        text: "Hello, world!"
    }
    MouseArea {
         anchors.fill: parent
         //onClicked: someSingleton.makeScreenshot();
    }

}


But image not saved just because it is empty. If I call 
QQuickWindow::grabWindow() from QML, for example, after clicking at MouseArea 
it works well.

So from this I conclude that  when I call  rootObject->grabWindow()it still not 
loaded completly yet.I've tried to call this function in this way:

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

But the program just hungs up in this slot and no image was saved.






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