Dynamicly add c++class instances tu qml objects (not with listview)

[888rok]

Hi guys &girls,
I'm writing an application that tracks the head movement from webcam and paint na image over the face. The problem is how to create and bind c++class instance to qml.
Pseudo c++ code:
@Class FaceItem{
String imagePath;
float scale;
QVector2D position;
QVector3D rotation;
}@

And now how do I create and bind a qml objects like:
@Image{
source:imagePath
x:position.x
y:positon.y
scale:scale
Rotation {axis: Qt.vector3d(0, 0, 1); angle: rotation_.x }
}@

I have tried ListView example (http://qt-project.org/doc/qt-5/qtquick-modelviewsdata-cppmodels.html), but position of list element doesnt work for me, because listview does not permit to overlay two list elements(in my case images).
Thanks for your help!

[jeremy_k]

Have you looked at QQmlEngine::qmlRegisterSingletonType() ?

This would allow you to define a QObject-based class from C++ with properties corresponding to each value to be passed from C++ to QML. Just emit the notify signal when each value is updated.

[888rok]

Thanks for replay.
Yes, I have looked at this approach, but I dont understand how to connect an instance of a c++ class with generated qml item.
Hod do I generate qml items? with javascript?
How do I connect qml to a class instance? Does QQmlContext::setContextProperty work on dynamicly generated qml items?

[jeremy_k]

Can you clarify the flow of the application? I'm not sure what is meant by generating of qml items and dynamically generated qml.

[888rok]

App flow if using ListView example:
@For each frame:

1. when new face is detected
   additem(image, position, rotation)
2. when face is tracked
   setProperty(position,QVector2d)
   setProperty(rotation,QVector3d)@

Hope this clarifies my problem.

[888rok]

Nevermind, I got it working with ListView.
Thank you for you help.

[jeremy_k]

Thanks for clarifying.

Another option is to use Qt.createComponent() and createObject() from javascript. The documentation for createComponent covers usage pretty well. The QML dynamic scene example provides a demonstration.

As long as it works for you, I would stick with the ListView.