Integrating QML and C++

[pirates21]

I create a program in qt creator "Qt widget application" for raspberry pi (cross-compiling). I need to put a QML object in the program and have access to its property (color, height, width, etc.)
Placing qml objects works like this:

          QQuickWidget * view = new QQuickWidget (ui-> centralWidget);
           view-> SetSource (QUrl :: fromLocalFile ( "main.qml"));
           view-> show ();

Unfortunately, here I have no way to change the properties QML in runtime.

How to do it is described here:
https://doc-snapshots.qt.io/qt5-5.9/qtqml-cppintegration-interactqmlfromcpp.html

but I have a problem with embedding this QML object on the form of my application.
I do it this way:

           QQuickView * view = new QQuickView ();
           QWidget * container = QWidget :: createWindowContainer (view, this);
           container-> setMinimumSize (200.400);
           container-> setMaximumSize (200.400);
           container-> setFocusPolicy (Qt :: TabFocus);
           view-> SetSource (QUrl ( "main.qml"));
          layout-> addWidget (container);

Here, unfortunately, I have an error: EGLFS: "OpenGL windows can not be mixed with others."

I'm stuck. I tried dozens of ways. How do I set up a QML object in my application that I can change RUNTIME?

[raven-worx]

@pirates21 said in Integrating QML and C++:

Placing qml objects works like this:
QQuickWidget * view = new QQuickWidget (ui-> centralWidget);
view-> SetSource (QUrl :: fromLocalFile ( "main.qml"));
view-> show ();

Unfortunately, here I have no way to change the properties QML in runtime.

why not?
view->rootObject() gives you the QuickItem* for the item specified in main.qml

qreal height = QQmlProperty(view->rootObject(), "height").read().value<qreal>();
// or
qreal height = view->rootObject()->property("height").value<qreal>();

[pirates21]

It works. Thank you very much! :)