private ReadOnlyFilteredView(IEnumerable <T> source, Func <T, bool> filter, IScheduler scheduler, TimeSpan bufferTime, IReadOnlyList <IObservable <object> > triggers)
{
Ensure.NotNull(source, nameof(source));
Ensure.NotNull(filter, nameof(filter));
this.source = source;
this.Filter = filter;
this.BufferTime = bufferTime;
this.SetSource(this.Filtered());
this.refreshSubscription = FilteredRefresher.Create(this, source, bufferTime, triggers, scheduler, false)
.Subscribe(this.Refresh);
}
/// <summary>
///
/// </summary>
/// <param name="source">The collection to wrap</param>
/// <param name="filter"></param>
/// <param name="bufferTime">The time to defer updates, useful if many triggers fire in short time. Then it will be only one Reset</param>
/// <param name="scheduler">The scheduler used when throttling. The collection changed events are raised on this scheduler</param>
/// <param name="triggers">Triggers when to re evaluate the filter</param>
public FilteredView(
IList <T> source,
Func <T, bool> filter,
TimeSpan bufferTime,
IScheduler scheduler,
params IObservable <object>[] triggers)
: base(source, Filtered(source, filter))
{
if (filter == null)
{
filter = x => true;
}
this.scheduler = scheduler;
this.bufferTime = bufferTime;
this.filter = filter;
if (triggers == null || triggers.Length == 0)
{
this.triggers = new ObservableCollection <IObservable <object> >();
}
else
{
this.triggers = new ObservableCollection <IObservable <object> >(triggers);
}
this.refreshSubscription.Disposable = FilteredRefresher.Create(this, source, bufferTime, triggers, scheduler, false)
.ObserveOn(scheduler ?? Scheduler.Immediate)
.Subscribe(this.Refresh);
var observables = new IObservable <object>[]
{
this.Triggers.ObserveCollectionChanged(false),
this.ObservePropertyChangedSlim(nameof(this.Filter), false),
this.ObservePropertyChangedSlim(nameof(this.BufferTime), false)
};
observables.Merge()
.ThrottleOrDefault(bufferTime, scheduler)
.Subscribe(_ => this.refreshSubscription.Disposable = FilteredRefresher.Create(this, source, bufferTime, triggers, scheduler, true)
.ObserveOn(scheduler ?? Scheduler.Immediate)
.Subscribe(this.Refresh));
}
