private void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
CollectionChanged?.Invoke(this, e);
if (this.parent == null || (e.Action == NotifyCollectionChangedAction.Remove && HasChildElements) || e.Action == NotifyCollectionChangedAction.Move || e.Action == NotifyCollectionChangedAction.Replace)
{
return;
}
bool isVisible = HasChildElements;
SimpleCollectionView parent = this.parent;
SimpleCollectionView child = this;
if (isVisible)
{
var parents = new Stack <Tuple <SimpleCollectionView, SimpleCollectionView> >();
while (parent != null && !parent.filtered.ContainsKey(child.key))
{
if (parent.Options.Filter != null && !parent.options.Filter(child.item))
{
break;
}
parents.Push(new Tuple <SimpleCollectionView, SimpleCollectionView> (parent, child));
child = parent;
parent = parent.parent;
}
while (parents.Count > 0)
{
var pair = parents.Pop();
pair.Item1.AddFiltered(pair.Item2.key);
}
}
else
{
var parents = new List <Tuple <SimpleCollectionView, SimpleCollectionView> >();
while (parent != null && parent.filtered.ContainsKey(child.key) && !child.HasChildElements)
{
parents.Add(new Tuple <SimpleCollectionView, SimpleCollectionView> (parent, child));
child = parent;
parent = parent.parent;
}
for (int i = 0; i < parents.Count; i++)
{
var pair = parents[i];
pair.Item1.RemoveFiltered(new[] { pair.Item2.key });
}
}
}
private void Reset(bool notify = true)
{
this.arranged.Clear();
this.filtered.Clear();
bool filtering = IsFiltering;
foreach (var sourceItem in this.source.Cast <object>().Select(o => new { Item = o, Key = this.options.DisplaySelector(o) }).OrderBy(e => e.Key, Comparer))
{
Element e = new Element {
Item = sourceItem.Item
};
this.arranged.Add(sourceItem.Key, e);
SimpleCollectionView childView = null;
IEnumerable children = (Options.ChildrenSelector != null) ? this.options.ChildrenSelector(sourceItem.Item) : sourceItem.Item as IEnumerable;
if (Options.ChildOptions != null)
{
if (children == null)
{
throw new InvalidOperationException("ChildOptions specified, but element not enumerable or no selector");
}
childView = new SimpleCollectionView(children, Options.ChildOptions, this, sourceItem.Key, sourceItem.Item);
e.ChildrenView = childView;
}
if (!filtering || this.options.Filter(e.Item))
{
this.filtered.Add(sourceItem.Key, e);
}
}
if (notify)
{
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
}
private SimpleCollectionView(IEnumerable source, SimpleCollectionViewOptions options, SimpleCollectionView parent = null, string key = null, object item = null)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
this.wasFilterNull = (options.Filter == null);
this.source = source;
this.parent = parent;
this.item = item;
this.key = key;
SetOptions(options, notify: false);
var changed = source as INotifyCollectionChanged;
if (changed != null)
{
changed.CollectionChanged += OnSourceCollectionChanged;
}
}
