/// <summary>
/// Creates observable sequence from <paramref name="source"/> ListChanged events.
/// </summary>
public static IObservable <NotifyListChangedEventArgs <T> > AsObservable <T>(this INotifyListChanged <T> source)
{
return(Observable.FromEventPattern <NotifyListChangedEventArgs <T> >(
h => source.ListChanged += h,
h => source.ListChanged -= h
).Select(e => e.EventArgs));
}
/// <summary>
/// Creates observable sequence from <paramref name="source"/> ListChanged events and selects the current snapshot of the list (<see cref="NotifyListChangedEventArgs{T}.Items"/>).
/// </summary>
public static IObservable <IList <T> > AsItemsBehaviorObservable <T>(this INotifyListChanged <T> source)
{
return(source.AsBehaviorObservable().Select(e => e.Items));
}
/// <summary>
/// Creates observable sequence from <paramref name="source"/> ListChanged events.
/// Observable will start with <see cref="NotifyListChangedAction.Reset"/> notification containing current snapshot of items.
/// </summary>
public static IObservable <NotifyListChangedEventArgs <T> > AsBehaviorObservable <T>(this INotifyListChanged <T> source)
{
return(Observable.Defer(() =>
{
var items = source.GetSnapshot();
return Observable.Return(new NotifyListChangedEventArgs <T>(NotifyListChangedAction.Reset, items, items));
})
.Concat(
source.AsObservable()
));
}
