How to access root context property from instantiated C++ QObject

[don@thegagnes.com]

On the C++ side I do this:

rootContext()->setContextProperty("foo", fooObject);

rootContext()->setContextProperty("foo", fooObject);

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Then in Qml I do this:

Item {
   MyCPlusPlusObject { }
   Text {
      text: foo.someTextProperty
   }
}

Item {
   MyCPlusPlusObject { }
   Text {
      text: foo.someTextProperty
   }
}

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Where MyCPlusPlusObject is a simple QObject based C++ object that is registered with qmlRegisterType. The question is how can I get a hold of the "foo" context property from inside the implementation of MyCPlusPlusObject. I need to somehow get a hold of the root context to get the property out of it.

[anda_skoa]

If you need access to something, why not pass it to the object explicitly?

Cheers,
_

[don@thegagnes.com]

I"m trying to make it be more automatic. There can be many of these cpp objects in the qml. Having to add the property to every one of them is a lot of additional stuff. But if it's the only option then it may be required.

[wysota]

I"m trying to make it be more automatic. There can be many of these cpp objects in the qml. Having to add the property to every one of them is a lot of additional stuff. But if it's the only option then it may be required.

What you want breaks encapsulation so it's best if you manage to avoid such constructs.

[anda_skoa]

I"m trying to make it be more automatic. There can be many of these cpp objects in the qml. Having to add the property to every one of them is a lot of additional stuff. But if it's the only option then it may be required.

Well, aside from the obvious option of making foo a singleton and accessing it through that mechanism independent of its role as a context property, you can easily retrieve the QQmlEngine that has instantiated the instance of your type, see the non-member function documentation that is part of the QQmlEngine ones.

Cheers,
_