private void TrackCollection()
{
var items = Items as ObservableCollection <TItem>;
if (items != null)
{
var collection = items;
_itemsChangedHandler = WeakEvent.RegisterEvent <ObservableCollectionViewBase <TItem>, NotifyCollectionChangedEventHandler, NotifyCollectionChangedEventArgs>(
this,
h => collection.CollectionChanged += h,
h => collection.CollectionChanged -= h,
h => (o, e) => h(o, e),
(subscriber, s, e) => subscriber.OnOriginalCollectionChanged(s, e));
}
}
private void RegisterEvent(INotifyPropertyChanged item)
{
if (_events.ContainsKey(item))
{
return;
}
var handler = WeakEvent.RegisterEvent <ObservableCollectionViewBase <TItem>, PropertyChangedEventHandler, PropertyChangedEventArgs>(
this,
h => item.PropertyChanged += h,
h => item.PropertyChanged -= h,
h => (o, e) => h(o, e),
(subscriber, s, e) => subscriber.Refresh());
_events.Add(item, handler);
}