private void AddToSubgroups(object item, CollectionViewGroupInternal group, int level, bool loading)
{
object groupName = this.GetGroupName(item, group.GroupBy, level);
if (groupName == CollectionViewGroupRoot.UseAsItemDirectly)
{
if (loading)
{
group.Add(item);
}
else
{
int index1 = group.Insert(item, item, this.ActiveComparer);
int index2 = group.LeafIndexFromItem(item, index1);
this.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item, index2));
}
}
else
{
ICollection collection;
if ((collection = groupName as ICollection) == null)
{
this.AddToSubgroup(item, group, level, groupName, loading);
}
else
{
foreach (object name in (IEnumerable)collection)
{
this.AddToSubgroup(item, group, level, name, loading);
}
}
}
}
private void AddToSubgroup(object item, CollectionViewGroupInternal group, int level, object name, bool loading)
{
int index = 0;
for (int count = group.Items.Count; index < count; ++index)
{
CollectionViewGroupInternal group1 = group.Items[index] as CollectionViewGroupInternal;
if (group1 != null && group.GroupBy.NamesMatch(group1.Name, name))
{
group.LastIndex = index;
this.AddToSubgroups(item, group1, level + 1, loading);
return;
}
}
CollectionViewGroupInternal group2 = new CollectionViewGroupInternal(name, group);
this.InitializeGroup(group2, level + 1);
if (loading)
{
group.Add((object)group2);
group.LastIndex = index;
}
else
{
group.Insert((object)group2, item, this.ActiveComparer);
}
this.AddToSubgroups(item, group2, level + 1, loading);
}
private void InitializeGroup(CollectionViewGroupInternal group, int level)
{
GroupDescription groupDescription = level < this.GroupDescriptions.Count ? this.GroupDescriptions[level] : (GroupDescription)null;
group.GroupBy = groupDescription;
ObservableCollection <object> observableCollection = groupDescription != null ? groupDescription.GroupNames : (ObservableCollection <object>)null;
if (observableCollection != null)
{
int index = 0;
for (int count = observableCollection.Count; index < count; ++index)
{
CollectionViewGroupInternal group1 = new CollectionViewGroupInternal(observableCollection[index], group);
this.InitializeGroup(group1, level + 1);
group.Add((object)group1);
}
}
group.LastIndex = 0;
}