void setupRx(IEnumerable <T> initialContents = null, IScheduler scheduler = null, double resetChangeThreshold = 0.3)
{
if (rxObjectsSetup)
{
return;
}
scheduler = scheduler ?? RxApp.DeferredScheduler;
_inner = _inner ?? new List <T>();
_changing = new Subject <NotifyCollectionChangedEventArgs>();
_changing.Subscribe(raiseCollectionChanging);
_changed = new Subject <NotifyCollectionChangedEventArgs>();
_changed.Subscribe(raiseCollectionChanged);
ResetChangeThreshold = resetChangeThreshold;
_beforeItemsAdded = new Lazy <Subject <T> >(() => new Subject <T>());
_itemsAdded = new Lazy <Subject <T> >(() => new Subject <T>());
_beforeItemsRemoved = new Lazy <Subject <T> >(() => new Subject <T>());
_itemsRemoved = new Lazy <Subject <T> >(() => new Subject <T>());
_itemChanging = new Lazy <Subject <IObservedChange <T, object> > >(() => new Subject <IObservedChange <T, object> >());
_itemChanged = new Lazy <Subject <IObservedChange <T, object> > >(() => new Subject <IObservedChange <T, object> >());
_beforeItemsMoved = new Lazy <Subject <IMoveInfo <T> > >(() => new Subject <IMoveInfo <T> >());
_itemsMoved = new Lazy <Subject <IMoveInfo <T> > >(() => new Subject <IMoveInfo <T> >());
// NB: We have to do this instead of initializing _inner so that
// Collection<T>'s accounting is correct
foreach (var item in initialContents ?? Enumerable.Empty <T>())
{
Add(item);
}
// NB: ObservableCollection has a Secret Handshake with WPF where
// they fire an INPC notification with the token "Item[]". Emulate
// it here
CollectionCountChanging.Select(x => new PropertyChangingEventArgs("Count")).Subscribe(this.raisePropertyChanging);
CollectionCountChanged.Select(x => new PropertyChangedEventArgs("Count")).Subscribe(this.raisePropertyChanged);
Changing.Select(x => new PropertyChangingEventArgs("Item[]")).Subscribe(this.raisePropertyChanging);
Changed.Select(x => new PropertyChangedEventArgs("Item[]")).Subscribe(this.raisePropertyChanged);
rxObjectsSetup = true;
}
