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[EMFForms] How to access an EObject whose EStructuralFeature is being edited [message #1705963]

Thu, 20 August 2015 13:07

Radoslaw Stachowiak

Messages: 3
Registered: November 2014

Junior Member

Hi

I have a model similar to the following:

class A {
    SomeType value;
    AnotherType context;
}
class B {
    A a1;
    A a2;
}

I generate editor with EMFForms for instance of class B and have defined a custom renderer for feature A.value. However, the behavior of the renderer depends on the contents of A.context field. This means, that my renderer needs access to the exact instance of A (either a1 or a2) that this renderer is editing.
In EMFForms 1.5 this was simple. getViewModelContext().getDomainModel() in renderer contains exactly what I needed.
In EMFForms 1.6 that same call always returns instance of B.
My question is: Is there a simple way to access the instance of object being edited in renderer (a1 or a2 in this case)? And I can't use TreeMasterDetail here, because all controls must be visible on screen at the same time. I can think of a couple solutions, but they will probably have a very high chance of stopping working in next EMFForms release.

Best regards
Radek Stachowiak

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Re: [EMFForms] How to access an EObject whose EStructuralFeature is being edited [message #1706024 is a reply to message #1705963]

Fri, 21 August 2015 08:03

Eugen Neufeld

Messages: 174
Registered: May 2015

Senior Member

Hi Radek,
In EMFForms 1.6 we introduced an EMFFormsDatabinding Service.
You can retrieve the currently edited instance in a renderer using it:

final IObservableValue observableValue =getModelValue();
//final EStructuralFeature structuralFeature = (EStructuralFeature) observableValue.getValueType();
final EObject eObject = (EObject) ((IObserving) observableValue).getObserved();

The reason for the more "ugly" code is our attempt to make the emfforms renderer more independent of EMF as a data model.

Cheers,
Eugen

--
Eugen Neufeld

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Re: [EMFForms] How to access an EObject whose EStructuralFeature is being edited [message #1706043 is a reply to message #1706024]

Fri, 21 August 2015 11:11

Radoslaw Stachowiak

Messages: 3
Registered: November 2014

Junior Member

Hi

Thanks for the reply.
I also found this solution in one of EMFForms classes Smile

Radek

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