The problem is solved please check this https://forum.qt.io/topic/113640/solved-why-q-window-events-are-eaten-by-qml-item thanks

Hi and welcome to devnet, Please take a look at the Qt Quick Scene Graph chapter of Qt's documentation. You have there the explanation on how it's working and what you can use these signals for. There's also the Scene Graph - OpenGL Under QML example that shows how to use beforeRendering . Hope it helps

Hey.... how did you solved this probleam??. I''m also facing the same issue - white screen. Thanks.

@thorbjorn : Thanks! Very useful answer (unlike the docs, which are really lacking on this :) ). I'll use the QQmlApplicationEngine way.

Great tip! No, using QQuickWidget seems to solve the problem!

Hi @AmalRaj and Welcome, Whenever you create an item using QQmlComponent and create you must set it a visual parent using setParentItem. For that you will need to cast it to QQuickItem otherwise it wont be displayed QQmlComponent component(&engine, QUrl(QStringLiteral("qrc:/Game.qml"))); QQuickItem *object = qobject_cast<QQuickItem*>(component.create()); Then try setting its properties. P.S: The forum use markdown syntax. So while posting code surround it with ``` (3 backticks) so that it appears more readable. I have edited it this time.

I just did some more experiments and it seems that if I subclass QQuickView and put debug outputs in the focusInEvent and focusOutEvent handlers, there are cases in which clicking any element in the QML structure gives the quickview focus, but in other cases (e.g. when I click on one of the "border" widgets, not necessarily its own one, and then back into it) it doesn't get focus. How is that possible?

@ileonte Uh, i must use Qt5.3.1, coz our project demands this version....I think i have to read file to get target text string. Anyway, thank you~ :)

@xumuk As said earlier it is a limitation. But if you still need it you should have a look at the 2nd and 3rd paragraph in the link which I posted earlier. Basically you will have to do this: QQuickWidget *wd = new QQuickWidget(this); wd->setAttribute(Qt::WA_AlwaysStackOnTop); wd->setClearColor(Qt::transparent); //and the opacity can be set in QML istelf for eg. for a Rectangle Rectangle { width: 300 height: 300 color: "green" opacity: 0.5 } If you load this QML in the QQuickWIdget and put a QWidget in background it should be visible.