[news.eclipse.platform] Re: ObservabelList question and databinding

["Boris Bokowski" <Boris_Bokowski@xxxxxxxxxx>]

"Joel Gregoire" <joelgreg@xxxxxxxxx> wrote in message 
news:eab73a79d102c7a08d3d51168fdca717$1@xxxxxxxxxxxxxxxxxx
> I've been playing with Observables for a while and I'm wondering if I'm 
> missing something. Is it possible to detect a change in one of the items 
> within an ObservableList?? I can surely detect additions and removals but 
> I can't detect a change of an item.

> targetObservableList.addListChangeListener( new ListChangeListener() );
>stephane.setMonth( new Month("50") );

An observable list only notifies about changes to itself (the list), not 
about changes to objects contained in the list. You could try the following:

IObservableSet targetAsSet = new ListToSetAdapter(targetObservableList);
IObservableMap monthMap = BeansObservables.observeMap(targetAsSet, 
Person.class, "month");
monthMap.addMapChangeListener(new IMapChangeListener(){
  public void handleMapChange(MapChangeEvent event) {
    for(Iterator it = event.diff.getChangedKeys().iterator(); 
it.hasNext(); ) {
      Object key = it.next();
      System.out.println("changed month of " + key + " from " + 
event.diff.getOldValue(key) + " to " + event.diff.getNewValue(key));
    }
  }
});

Boris