[Interest] QML: onLoaded signal for QQuickWindow or QQmlApplicationEngine

ruslan ruslan at khvmntk.ru
Mon Jan 12 07:17:17 CET 2015

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;
QQuickWindow *rootObject = qobject_cast<QQuickWindow *>(p_engine.rootObjects().first());

QImage image = rootObject->grabWindow();

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();

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

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