private void InsertAddedItems(NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
int index = e.NewStartingIndex;
int nextItemIndex = index;
if (!HasChildren)
{
//first child, should be in the treeitem place
nextItemIndex = -1;
}
else if (index == 0)
{
nextItemIndex = -1;
}
else if (index == Children.Count)
{
nextItemIndex = ContainerList.IndexOf(this) + CountVisibleDescendatns();
}
else
{
var nextItem = Children[index];
nextItemIndex = ContainerList.IndexOf(nextItem) - 1;
}
var newChildren = new List <LiteTreeViewItemViewModel>();
foreach (object obj in e.NewItems)
{
newChildren.Add(AddChild(obj, index));
index++;
}
FillTreeList(ContainerList, newChildren, ref nextItemIndex);
}
}