private static IObservable <T> ObserveFullPropertyPathCore <TNotifier, TProperty, T>(this TNotifier source, NotifyingPath <TNotifier, TProperty> notifyingPath, Func <object, PropertyChangedEventArgs, T> create, bool signalInitial = true)
where TNotifier : class, INotifyPropertyChanged
{
if (signalInitial)
{
return(Observable.Return(
create(
notifyingPath.SourceAndValue(source)
.Source,
CachedEventArgs.GetOrCreatePropertyChangedEventArgs(string.Empty)))
.Concat(source.ObserveFullPropertyPathCore(notifyingPath, create, signalInitial: false)));
}
return(Observable.Create <T>(
o =>
{
#pragma warning disable IDISP001 // Dispose created.
var tracker = notifyingPath.CreateTracker(source);
#pragma warning restore IDISP001 // Dispose created.
void Handler(object sender, PropertyChangedEventArgs e) => o.OnNext(create(sender, e));
foreach (var propertyTracker in tracker)
{
propertyTracker.TrackedPropertyChanged += Handler;
}
return Disposable.Create(
() =>
{
foreach (var propertyTracker in tracker)
{
propertyTracker.TrackedPropertyChanged -= Handler;
}
tracker.Dispose();
});
}));
}
