private void HandleItemAdded(int newStartingIndex, object newItem)
{
if (_filter != null && !_filter(newItem))
{
return;
}
if (_sortDescriptions.Any())
{
_sortProperties.Clear();
newStartingIndex = _view.BinarySearch(newItem, this);
if (newStartingIndex < 0)
{
newStartingIndex = ~newStartingIndex;
}
}
else if (_filter != null)
{
if (_sourceList == null)
{
HandleSourceChanged();
return;
}
var visibleBelowIndex = 0;
for (int i = newStartingIndex; i < _sourceList.Count; i++)
{
if (!_filter(_sourceList[i]))
{
visibleBelowIndex++;
}
}
newStartingIndex = _view.Count - visibleBelowIndex;
}
_view.Insert(newStartingIndex, newItem);
if (newStartingIndex <= _index)
{
_index++;
}
var e = new VectorChangedEventArgs(CollectionChange.ItemInserted, newStartingIndex, newItem);
OnVectorChanged(e);
}
private void HandleItemRemoved(int oldStartingIndex, object oldItem)
{
if (_filter != null && !_filter(oldItem))
{
return;
}
if (oldStartingIndex < 0 || oldStartingIndex >= _view.Count || !Equals(_view[oldStartingIndex], oldItem))
{
oldStartingIndex = _view.IndexOf(oldItem);
}
if (oldStartingIndex < 0)
{
return;
}
_view.RemoveAt(oldStartingIndex);
if (oldStartingIndex <= _index)
{
_index--;
}
var e = new VectorChangedEventArgs(CollectionChange.ItemRemoved, oldStartingIndex, oldItem);
OnVectorChanged(e);
}
