Sharing same data class through diferent qmlRegisterTypes

  • Hi all.

    I've an app running Qt 5.2.1 where I have several qmlRegisterType classes working.
    All of them need the same data, and they have indeed the same, with a singleton class.

    I know it's not the best way to do it.
    And my question is how can I pass a reference of my class to all qml register types?

    I tryed adding an int to QQmlApplicationEngine as contextProperty, and can read it on QML.
    But I need to pass a reference of my object, from main.cpp (I think), to QML side and then... how can I pass this reference to C++ side?
    How should be the C++ constructor of these qmlRegisterTypes?
    How I should initialize qmlRegisterTypes in QML to get my class reference as argument?

    Am I wrong? Or is there another better way to do it?

    My register types inherit from QObject or QQuickPaintedItem:

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