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EMF and TreeViewer/IDeferredWorkbenchAdapter [message #647647]

Fri, 07 January 2011 09:58

Eclipse User

Hello,

i use EMF to generate MyObject.
There is a class Node which has a 1:n assoziation to itself.

i create a TreeViewer

			final TreeViewer viewer = new TreeViewer(client, SWT.H_SCROLL | SWT.V_SCROLL | SWT.VIRTUAL);
	        AdapterFactory factory = new ProvidermodelItemProviderAdapterFactory();
	        viewer.setLabelProvider(new AdapterFactoryLabelProvider(factory));
	        viewer.setContentProvider(new AdapterFactoryContentProvider(factory));
ProvidermodelFactory.eINSTANCE.createNode();
				for(int j = 0; j<5;j++){
					Node node = ProvidermodelFactory.eINSTANCE.createNode();
					root.getChildren().add(node);
					for(int i = 0 ;i < 100000; i++){
						Node node1 = ProvidermodelFactory.eINSTANCE.createNode();
						node.getChildren().add(node1);
					}
					
					
				}

	        
	        viewer.setInput(root);

If i click + the ui thread is blocked.
How can i use the IDeferredWorkbenchAdapter with EMF? So when i click at + there is a label "Pending".

Thanks

Re: EMF and TreeViewer/IDeferredWorkbenchAdapter [message #647673 is a reply to message #647647]

Fri, 07 January 2011 11:40

Eclipse User

Comments below.

SirWayne wrote:
> Hello,
>
> i use EMF to generate MyObject.
> There is a class Node which has a 1:n assoziation to itself.
>
> i create a TreeViewer
>
>
> final TreeViewer viewer = new TreeViewer(client,
> SWT.H_SCROLL | SWT.V_SCROLL | SWT.VIRTUAL);
> AdapterFactory factory = new
> ProvidermodelItemProviderAdapterFactory();
> viewer.setLabelProvider(new
> AdapterFactoryLabelProvider(factory));
> viewer.setContentProvider(new
> AdapterFactoryContentProvider(factory));
> ProvidermodelFactory.eINSTANCE.createNode();
> for(int j = 0; j<5;j++){
> Node node =
> ProvidermodelFactory.eINSTANCE.createNode();
> root.getChildren().add(node);
> for(int i = 0 ;i < 100000; i++){
That's a lot of children. The user won't have much fun scrolling
through 100,000 items.
> Node node1 =
> ProvidermodelFactory.eINSTANCE.createNode();
> node.getChildren().add(node1);
> }
>
>
> }
>
> viewer.setInput(root);
>
>
> If i click + the ui thread is blocked.
> How can i use the IDeferredWorkbenchAdapter with EMF?
I don't know. I've never used that.
> So when i click at + there is a label "Pending".
Will it really be useful for the user to have to deal with 100,000
items? It seems unlikely...
>
> Thanks

Re: EMF and TreeViewer/IDeferredWorkbenchAdapter [message #647684 is a reply to message #647647]

Fri, 07 January 2011 13:18

Eclipse User

We have to deal with relatively large EMF models all the time. The best way to view these that I know of (without creating custom editors) is the MoDisco Model Browser. It is a mature generic EMF browser/editor with many features; a great piece of EMF ecosystem that deserves more attention than it gets.

The one feature relevant to this discussion is the way it deals with presenting large collections in the tree: it breaks them into ranges e.g. [1..100], [101..200] etc. (and probably uses some heuristics to come up with ranges dynamically based on the size of the collection) which keeps the number of tree nodes that need to be expanded at the same time small. (It also supports selecting any collection/reference and showing objects in a table which also works fine on relatively large models.)

I would guess this is a common way to deal with the issue of visualizing large trees, and one could implement this in a custom tree editor - but there would have to be a very good reason to not use a generic (and highly customizable) viewer/editor available.

[Updated on: Fri, 07 January 2011 13:20] by Moderator

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