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EMF Providers dynamically [message #1047537]

Tue, 23 April 2013 06:52

Eclipse User

Hi,

I have an EMF model which is used in a TreeViewer. On right click on tree, by default EMF provides the list of possible children. I want to modify this child list (show only few children) based on some conditions dynamically. Similarly the property descriptors list also need to be modified. What is the best possible way to achieve this?

Dynamic behavior is because the conditions are added based on the user inputs.

Thanks.
Dhanya

Re: EMF Providers dynamically [message #1047755 is a reply to message #1047537]

Tue, 23 April 2013 11:53

Eclipse User

Dhanya,

You'd need to specialize the generated item provider(s) that produce
these things.

On 23/04/2013 2:46 PM, Dhanya M wrote:
> Hi,
>
> I have an EMF model which is used in a TreeViewer. On right click on
> tree, by default EMF provides the list of possible children. I want to
> modify this child list (show only few children) based on some
> conditions dynamically. Similarly the property descriptors list also
> need to be modified. What is the best possible way to achieve this?
>
> Dynamic behavior is because the conditions are added based on the user
> inputs.
>
> Thanks.
> Dhanya

Re: EMF Providers dynamically [message #1048130 is a reply to message #1047755]

Wed, 24 April 2013 00:46

Eclipse User

Currently what i have done is modify each providers newChildDescriptors collection in collectNewChildDescriptors(..) method. Is that the correct approach?

Re: EMF Providers dynamically [message #1048161 is a reply to message #1048130]

Wed, 24 April 2013 01:48

Eclipse User

Dhanya,

Those are responsible for the choices the context menus, so yes, if you
want to modify that too, that's how you'd do it...

On 24/04/2013 6:46 AM, Dhanya M wrote:
> Currently what i have done is modify each providers
> newChildDescriptors collection in collectNewChildDescriptors(..)
> method. Is that the correct approach?

Re: EMF Providers dynamically [message #1048175 is a reply to message #1047537]

Wed, 24 April 2013 02:08

Eclipse User

Thanks.

Also is there a possibility to restrict the enumerators values in Properties view?
Eg: If I have an Enumerator with values A,B,C,D and I want to show only A and B based on some conditions in the properties view, is it possible?

Re: EMF Providers dynamically [message #1048225 is a reply to message #1048175]

Wed, 24 April 2013 03:33

Eclipse User

Dhanya,

Yes, you can specialize the property descriptor's getChoiceOfValues.

On 24/04/2013 8:08 AM, Dhanya M wrote:
> Thanks.
>
> Also is there a possibility to restrict the enumerators values in
> Properties view?
> Eg: If I have an Enumerator with values A,B,C,D and I want to show
> only A and B based on some conditions in the properties view, is it
> possible?

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