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);
}
private void RemoveFromView(int itemIndex, object item)
{
_view.RemoveAt(itemIndex);
if (itemIndex <= CurrentPosition)
{
CurrentPosition--;
}
var e = new VectorChangedEventArgs(CollectionChange.ItemRemoved, itemIndex, item);
OnVectorChanged(e);
}
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 (var 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 bool HandleItemAdded(int newStartingIndex, object newItem, int?viewIndex = null)
{
if (_filter != null && !_filter(newItem))
{
return(false);
}
var newViewIndex = _view.Count;
if (_sortDescriptions.Any())
{
_sortProperties.Clear();
newViewIndex = _view.BinarySearch(newItem, this);
if (newViewIndex < 0)
{
newViewIndex = ~newViewIndex;
}
}
else if (_filter != null)
{
if (_source == null)
{
HandleSourceChanged();
return(false);
}
if (newStartingIndex == 0 || _view.Count == 0)
{
newViewIndex = 0;
}
else if (newStartingIndex == _source.Count - 1)
{
newViewIndex = _view.Count - 1;
}
else if (viewIndex.HasValue)
{
newViewIndex = viewIndex.Value;
}
else
{
for (int i = 0, j = 0; i < _source.Count; i++)
{
if (i == newStartingIndex)
{
newViewIndex = j;
break;
}
if (_view[j] == _source[i])
{
j++;
}
}
}
}
_view.Insert(newViewIndex, newItem);
if (newViewIndex <= CurrentPosition)
{
CurrentPosition++;
}
var e = new VectorChangedEventArgs(CollectionChange.ItemInserted, newViewIndex, newItem);
OnVectorChanged(e);
return(true);
}