c++ class that adds a drawable qquickitem

spiderdab

..not a good title, I'm sorry..
I'm reading a lot in these days, but couldn't find what I need, but I think it is simpler that I imagine.

I need dynamically created objects, but those objects are both a c++ class and a drawable item.

From instructions taken HERE I can dynamically create qml objects. and it works.

Next I understand that to be able to create the class in runtime, when I need, the right way is to use

qmlRegisterType<MyClass>("myClass", 1, 0, "MyClass");

... and it works too..

I've read that to have the possibility of draw objects, I have to derive my c++ class from QQuickItem, instead of QObject, but I didn't find any example, nor how to implement this.

Can you help me?
Let's say that I have a button. every time I click that I want to add a c++ object class to a QList and draw a Rectangle with information inside. After that object variables are changed in main.cpp, and visualization should change accordingly.

GrecKo

@spiderdab said in c++ class that adds a drawable qquickitem:

Let's say that I have a button. every time I click that I want to add a c++ object class to a QList and draw a Rectangle with information inside. After that object variables are changed in main.cpp, and visualization should change accordingly.

Why do you need a C++ QQuickItem for that?
All that can be done with a c++ model and a view (ListView, Repeater, ...) with delegates in QML.

I would also recommend not to use Qt.createQmlObject or Qt.createComponent from your link (too imperative) and stay on the declarative side by using models and views.

spiderdab

@GrecKo thanks.
Will , in this way, the c++ variables (model?) be visible inside main.cpp?

I'm looking here and here to understand your suggestion.

GrecKo

Yes it can, follow your second link if you want that.

spiderdab

Thank you. I'll go on that way.