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EMF Element Binding to TreeViewer [message #1806175]

Sun, 05 May 2019 00:14

Parsa Pourali

Messages: 210
Registered: February 2014

Senior Member

Hello,

I am using the below code snippet to show the model contents in a treeviewer. This works fine as I give the whole eResource as the input! However, I need to show only some part of the model, so I don't wanna start from the root of the model! I tried to give the element as the input but it doesn't work when I input an element in treeviewer's setinput (). Any idea would be appreciated.

Thanks,
Parsa

		composedAdapterFactory = new ComposedAdapterFactory(ComposedAdapterFactory.Descriptor.Registry.INSTANCE);
		composedAdapterFactory.addAdapterFactory(new ResourceItemProviderAdapterFactory());
		composedAdapterFactory.addAdapterFactory(new FormlItemProviderAdapterFactory());
		composedAdapterFactory.addAdapterFactory(new ReflectiveItemProviderAdapterFactory());

		Tree tree = new Tree(this, SWT.SINGLE);
		TreeViewer tv = new TreeViewer(tree);
		tv.setContentProvider(new AdapterFactoryContentProvider(composedAdapterFactory));
		tv.setLabelProvider(new AdapterFactoryLabelProvider(composedAdapterFactory));

           //HOW TO GIVE AN ELEMENT AND NOT THE RESOURCE HERE ?
		tv.setInput(FPC_SingletonData.getCurrentRoleable().eResource());

[Updated on: Sun, 05 May 2019 00:15]

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Re: EMF Element Binding to TreeViewer [message #1806177 is a reply to message #1806175]

Sun, 05 May 2019 03:03

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

I'm not sure what you mean by "it doesn't work" but likely the issue is that the input object x itself is not displayed in the tree but only result of the content provider's getElements(x). So if x is a resource, as in your case, resource.getContents() are shown in the tree. A handy trick is to use viewer.setInput(new ItemProvider(Collections.singleton(x))), so that x itself is displayed in the viewer.

Ed Merks
Professional Support: https://www.macromodeling.com/

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