void Add(NotifyCollectionChangedEventArgs args)
{
var startIndex = args.NewStartingIndex > -1 ? args.NewStartingIndex : IndexOf(args.NewItems[0]);
startIndex = AdjustPositionForHeader(startIndex);
var count = args.NewItems.Count;
if (count == 1)
{
_notifier.NotifyItemInserted(this, startIndex);
return;
}
_notifier.NotifyItemRangeInserted(this, startIndex, count);
}
public void NotifyItemRangeInserted(IItemSource group, int localIndex, int count)
{
localIndex = GetAbsolutePosition(group, localIndex);
notifier.NotifyItemRangeInserted(this, localIndex, count);
}