public IDisposable Subscribe(IObserver <ListChange <T> > observer)
{
var mapper = new WhereChangeMapper();
var gate = new object();
return(_source.Subscribe(
Observer.Create <ListChange <T> >(
onNext: change =>
{
lock (gate)
{
var newChanges = new List <ListChange <T> >();
change(
insert: (index, item) => newChanges.AddRange(mapper.Insert(index, item, _predicate(item))),
replace: (index, item) => newChanges.AddRange(mapper.Replace(index, item, _predicate(item))),
remove: index => newChanges.AddRange(mapper.Remove <T>(index)),
clear: () => newChanges.AddRange(mapper.Clear <T>()));
if (newChanges.Count > 0)
{
observer.OnNext(ListChange.Combine(newChanges));
}
}
},
onCompleted: observer.OnCompleted,
onError: observer.OnError)));
}
