void setupRx(IEnumerable <T> List = null)
{
_BeforeItemsAdded = new ScheduledSubject <T>(RxApp.DeferredScheduler);
_BeforeItemsRemoved = new ScheduledSubject <T>(RxApp.DeferredScheduler);
aboutToClear = new Subject <int>();
if (List != null)
{
foreach (var v in List)
{
this.Add(v);
}
}
var ocChangedEvent = new Subject <NotifyCollectionChangedEventArgs>();
CollectionChanged += (o, e) => ocChangedEvent.OnNext(e);
_ItemsAdded = ocChangedEvent
.Where(x =>
x.Action == NotifyCollectionChangedAction.Add ||
x.Action == NotifyCollectionChangedAction.Replace)
.SelectMany(x =>
(x.NewItems != null ? x.NewItems.OfType <T>() : Enumerable.Empty <T>())
.ToObservable())
.Multicast(new ScheduledSubject <T>(RxApp.DeferredScheduler))
.PermaRef();
_ItemsRemoved = ocChangedEvent
.Where(x =>
x.Action == NotifyCollectionChangedAction.Remove ||
x.Action == NotifyCollectionChangedAction.Replace)
.SelectMany(x =>
(x.OldItems != null ? x.OldItems.OfType <T>() : Enumerable.Empty <T>())
.ToObservable())
.Multicast(new ScheduledSubject <T>(RxApp.DeferredScheduler))
.PermaRef();
_CollectionCountChanging = Observable.Merge(
_BeforeItemsAdded.Select(_ => this.Count),
_BeforeItemsRemoved.Select(_ => this.Count),
aboutToClear
);
_CollectionCountChanged = ocChangedEvent
.Select(x => this.Count)
.DistinctUntilChanged();
_ItemChanging = new ScheduledSubject <IObservedChange <T, object> >(RxApp.DeferredScheduler);
_ItemChanged = new ScheduledSubject <IObservedChange <T, object> >(RxApp.DeferredScheduler);
// TODO: Fix up this selector nonsense once SL/WP7 gets Covariance
_Changing = Observable.Merge(
_BeforeItemsAdded.Select <T, IObservedChange <object, object> >(x =>
new ObservedChange <object, object>()
{
PropertyName = "Items", Sender = this, Value = this
}),
_BeforeItemsRemoved.Select <T, IObservedChange <object, object> >(x =>
new ObservedChange <object, object>()
{
PropertyName = "Items", Sender = this, Value = this
}),
aboutToClear.Select <int, IObservedChange <object, object> >(x =>
new ObservedChange <object, object>()
{
PropertyName = "Items", Sender = this, Value = this
}),
_ItemChanging.Select <IObservedChange <T, object>, IObservedChange <object, object> >(x =>
new ObservedChange <object, object>()
{
PropertyName = x.PropertyName, Sender = x.Sender, Value = x.Value
}));
_Changed = Observable.Merge(
_ItemsAdded.Select <T, IObservedChange <object, object> >(x =>
new ObservedChange <object, object>()
{
PropertyName = "Items", Sender = this, Value = this
}),
_ItemsRemoved.Select <T, IObservedChange <object, object> >(x =>
new ObservedChange <object, object>()
{
PropertyName = "Items", Sender = this, Value = this
}),
_ItemChanged.Select <IObservedChange <T, object>, IObservedChange <object, object> >(x =>
new ObservedChange <object, object>()
{
PropertyName = x.PropertyName, Sender = x.Sender, Value = x.Value
}));
_ItemsAdded.Subscribe(x => {
this.Log().DebugFormat("Item Added to {0:X} - {1}", this.GetHashCode(), x);
if (propertyChangeWatchers == null)
{
return;
}
addItemToPropertyTracking(x);
});
_ItemsRemoved.Subscribe(x => {
this.Log().DebugFormat("Item removed from {0:X} - {1}", this.GetHashCode(), x);
if (propertyChangeWatchers == null || !propertyChangeWatchers.ContainsKey(x))
{
return;
}
removeItemFromPropertyTracking(x);
});
#if DEBUG
_ItemChanged.Subscribe(x =>
this.Log().DebugFormat("Object {0} changed in collection {1:X}", x, this.GetHashCode()));
#endif
}