private void AddToSubgroups(object item, CollectionViewGroupInternal group, int level, bool loading)
{
var name = this.GetGroupName(item, group.GroupBy, level);
if (name == UseAsItemDirectly)
{
if (loading)
{
group.Add(item);
}
else
{
var index = group.Insert(item, item, this.ActiveComparer);
var num2 = group.LeafIndexFromItem(item, index);
this.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item, num2));
}
}
else
{
var is2 = name as ICollection;
if (is2 == null)
{
this.AddToSubgroup(item, group, level, name, loading);
}
else
{
foreach (var obj3 in is2)
{
this.AddToSubgroup(item, group, level, obj3, loading);
}
}
}
}
private void AddToSubgroup(object item, CollectionViewGroupInternal group, int level, object name, bool loading)
{
CollectionViewGroupInternal internal2;
var num = this.IsDataInGroupOrder ? group.LastIndex : 0;
var count = group.Items.Count;
while (num < count)
{
internal2 = group.Items[num] as CollectionViewGroupInternal;
if ((internal2 != null) && group.GroupBy.NamesMatch(internal2.Name, name))
{
group.LastIndex = num;
this.AddToSubgroups(item, internal2, level + 1, loading);
return;
}
num++;
}
internal2 = new CollectionViewGroupInternal(name, group);
this.InitializeGroup(internal2, level + 1);
if (loading)
{
group.Add(internal2);
group.LastIndex = num;
}
else
{
group.Insert(internal2, item, this.ActiveComparer);
}
this.AddToSubgroups(item, internal2, level + 1, loading);
}
private void InitializeGroup(CollectionViewGroupInternal group, int level)
{
var groupDescription = this.GetGroupDescription(group, level);
group.GroupBy = groupDescription;
var observables = (groupDescription != null) ? groupDescription.GroupNames : null;
if (observables != null)
{
var num = 0;
var count = observables.Count;
while (num < count)
{
var internal2 = new CollectionViewGroupInternal(observables[num], group);
this.InitializeGroup(internal2, level + 1);
group.Add(internal2);
num++;
}
}
group.LastIndex = 0;
}