public static IDisposable connect_sorted_distinct_mux <T, TResult>(IList <T> source_list, INotifyCollectionChanged source_notifier, IList <TResult> target, Func <T, IEnumerable <TResult> > selector, IComparer <TResult> comparer, IEqualityComparer <TResult> eq_comparer)
{
var ref_count = new RefCountMap <TResult>(eq_comparer);
if (target.Count > 0)
{
target.Clear();
}
foreach (var v in source_list)
{
var r = selector(v);
target.InsertSortedDistinct(r, comparer);
}
return(source_notifier.Subscribe(on_collection_changed));
void on_collection_changed(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
target.InsertSorted(e.NewItems.Cast <T>().SelectMany(selector).Where(ref_count.increment_adds_key), comparer);
break;
case NotifyCollectionChangedAction.Remove:
target.RemoveSorted(e.OldItems.Cast <T>().SelectMany(selector).Where(ref_count.decrement_removes_key), comparer);
break;
case NotifyCollectionChangedAction.Replace:
target.RemoveSorted(e.OldItems.Cast <T>().SelectMany(selector).Where(ref_count.decrement_removes_key), comparer);
target.InsertSorted(e.NewItems.Cast <T>().SelectMany(selector).Where(ref_count.increment_adds_key), comparer);
break;
case NotifyCollectionChangedAction.Reset:
target.Clear();
ref_count.Clear();
target.InsertSorted(source_list.SelectMany(selector).Where(ref_count.increment_adds_key), comparer);
break;
}
}
}
public void Clear()
{
StrokeMap.Clear();
RefCountMap.Clear();
TotalStrokeCount = 0;
}
