public UIElement this[int index]
{
get { return(children[index]); }
set
{
if (children[index] == value)
{
return;
}
NotifyCollectionChangedEventArgs args = NotifyCollectionChangedEventArgs.Replace(children[index], value, index);
if (children[index] != null)
{
ClearChildParent(children[index]);
}
children[index] = value;
if (children[index] != null)
{
SetChildParent(children[index]);
}
CollectionChanged.Raise(this, args);
}
}
private void OnSourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
object[] oldInnerCollection = innerCollection;
innerCollection = TranslateCollection(SourceCollection.Cast <object>(), filterPredicate, sortKeySelector, sortDirection).ToArray();
if (innerCollection.Contains(CurrentItem))
{
SetCurrent(CurrentItem);
}
else
{
SetCurrent(CurrentItemIndex >= oldInnerCollection.Length ? innerCollection.Length : CurrentItemIndex);
}
IEnumerable <object> oldItems = e.OldItems.Intersect(oldInnerCollection).ToArray();
IEnumerable <object> newItems = e.NewItems.Intersect(innerCollection).ToArray();
if (oldItems.Count() > 1 || newItems.Count() > 1)
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Reset(oldInnerCollection, innerCollection));
return;
}
object oldItem = e.OldItems.FirstOrDefault();
int oldIndex = Granular.Compatibility.Array.FindIndex(oldInnerCollection, item => Granular.Compatibility.EqualityComparer <object> .Default.Equals(item, oldItem));
object newItem = e.NewItems.FirstOrDefault();
int newIndex = Granular.Compatibility.Array.FindIndex(innerCollection, item => Granular.Compatibility.EqualityComparer <object> .Default.Equals(item, newItem));
if (oldIndex == -1 && newIndex == -1 || oldItem == newItem && oldIndex == newIndex)
{
return;
}
if (Granular.Compatibility.EqualityComparer <object> .Default.Equals(oldItem, newItem))
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Move(newItem, oldIndex, newIndex));
}
else if (oldIndex == newIndex)
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Replace(oldItem, newItem, newIndex));
}
else
{
if (oldIndex != -1)
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Remove(oldItem, oldIndex));
}
if (newIndex != -1)
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Add(newItem, newIndex));
}
}
}
