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[databinding] ObservableTreeContentProvider and WritableList used together? [message #522673]

Tue, 23 March 2010 14:59

Marco Vettorello

Messages: 4
Registered: March 2010

Junior Member

Hello everybody,

I'm working in a project where we currently want need to provide a simple view in form of tree of a WritableList.

Since I start using WritableList and TableViewer there was no problem using the ObservableListContentProvider.

Now, that i need to use a TreeViewer, I have problem with the respective ObservableTreeContentProvider.
It need 2 the implementation of an ObservableFactory and a TreeSctureAdvisor.

Inside the WritableList I have either parents and childrens all toghether and at the moment I can't change the implementation of this list.

I really can't understand how to implement the ObservableFactory having this WritableList as unique a model.

Somebody can help me?
Thanks

Marco

[Updated on: Tue, 23 March 2010 15:00]

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Re: ObservableTreeContentProvider and WritableList used together? [message #523350 is a reply to message #522673]

Fri, 26 March 2010 05:03

Matthew Hall

Messages: 368
Registered: July 2009

Senior Member

I'm guessing you're having a problem using the WritableList as both the
input and the IObservableList for the root nodes. You can get around
this by checking whether the element is the input and returning a new
WritableList that is bound to the input.

final DataBindingContext bindingContext = ...
final WritableList input = ...

IObservableFactory childrenFactory = new IObservable() {
public IObservable createObservable(Object element) {
if (element==input) {
IObservableList rootElements = new WritableList();
bindingContext.bindList(rootElements, input);
return rootElements;
}
return BeanProperties.list("children").observe(element);
}
};

Does this help?

Matthew

Marco Vettorello wrote:
> Hello everybody,
>
> I'm working in a project where we currently want need to provide a
> simple view in form of tree of a WritableList.
>
> Since I start using WritableList and TableViewer there was no problem
> using the ObservableListContentProvider.
>
> Now, that i need to use a TreeViewer, I have problem with the respective
> ObservableTreeContentProvider.
> It need 2 the implementation of an ObservableFactory and a
> TreeSctureAdvisor.
>
> Inside the WritableList I have either parents and childrens all
> toghether and at the moment I can't change the implementation of this list.
>
> I really can't understand how to implement the ObservableFactory having
> this WritableList as unique a model.
>
> Somebody can help me?
> Thanks
>
> Marco

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Re: ObservableTreeContentProvider and WritableList used together? [message #523404 is a reply to message #523350]

Fri, 26 March 2010 10:32

Marco Vettorello

Messages: 4
Registered: March 2010

Junior Member

Dear Matthew,

Thanks so much for your help, this partially solve my problem.
your solution put a light on my darkness onside the IObservableFactory.

I managed to change a little bit my Model separating parents and leafs, using inside each parents a WritableList for the children like this:

public IObservable createObservable(final Object element){
  if (element instanceof WritableList) { //parents
    return ModelProvider.getInstance().getGateways(); //writableList
  }
  else if (element instanceof Gateway) { //childrens
    return ((Gateway)element).getChilds(); //writablelist
  }
  return BeanProperties.list("children").observe(element);
 }

This solve my problem on the IObservableFactory, looking for elements and returning childrens WritableList or parents WritableList.

However, did you think I really neccessary to bind my model WritableList to a new one inside the IObservableFactory, or i ca just return my model WritableList?
Thanks for your help!

Marco

[Updated on: Fri, 26 March 2010 10:34]

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Re: ObservableTreeContentProvider and WritableList used together? [message #523591 is a reply to message #523404]

Fri, 26 March 2010 22:54

Matthew Hall

Messages: 368
Registered: July 2009

Senior Member

The only thing for sure is that you shouldn't

Marco Vettorello wrote:
> However, did you think I really neccessary to bind my model WritableList
> to a new one inside the IObservableFactory, or i ca just return my model
> WritableList?

You can try it, I seem to remember there being a problem doing that, but
I don't remember what it was. Give it a try, let me know if it works
for you.

Matthew

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