public static IDisposable connect_item_hooks <T>(IReadOnlyObservableCollection <T> source, Func <T, IDisposable> get_item_hook)
{
var item_hooks = source.Select(get_item_hook).ToList();
return(new CompositeDisposable(
Disposable.wrap_collection(item_hooks),
source.Subscribe((s, e) => CollectionHelper.reflect_change(item_hooks, source, get_item_hook, d => d.Dispose(), e))));
}
/// <summary>
/// Initializes a new instance of the <see cref="TransformingReadOnlyObservableList{TSource, TTarget}" /> class.
/// </summary>
/// <param name="source">The source collection.</param>
/// <param name="selector">The transformation to apply to the items in <paramref name="source" />.</param>
/// <param name="onRemove">The callback to execute when an item is removed from the collection.</param>
/// <param name="targetComparer">
/// A comparer for the list items. This is only used if the source collection is not a list
/// and does not provide index information in its <see cref="NotifyCollectionChangedEventArgs"/> events.
/// </param>
public TransformingReadOnlyObservableList(IReadOnlyObservableCollection <TSource> source,
Func <TSource, TTarget> selector, Action <TTarget> onRemove = null, IEqualityComparer <TTarget> targetComparer = null)
: base(new ObservableCollection <TTarget>(source.Select(selector)))
{
_source = source;
_selector = selector;
_onRemove = onRemove;
_sourceComparer = targetComparer ?? EqualityComparer <TTarget> .Default;
CollectionChangedEventManager.AddListener(source, this);
}