private void RemoveItemFromSubgroupsByExhaustiveSearch(CollectionViewGroupInternal group, object item)
{
if (!this.RemoveFromGroupDirectly(group, item))
{
return;
}
for (int index = group.Items.Count - 1; index >= 0; --index)
{
CollectionViewGroupInternal group1 = group.Items[index] as CollectionViewGroupInternal;
if (group1 != null)
{
this.RemoveItemFromSubgroupsByExhaustiveSearch(group1, item);
}
}
}
private void RemoveEmptyGroup(CollectionViewGroupInternal group)
{
CollectionViewGroupInternal parent = group.Parent;
if (parent == null)
{
return;
}
GroupDescription groupBy = parent.GroupBy;
if (parent.ProtectedItems.IndexOf((object)group) < groupBy.GroupNames.Count)
{
return;
}
parent.Remove((object)group, false);
}
internal int LeafIndexFromItem(object item, int index)
{
int num = 0;
CollectionViewGroupInternal viewGroupInternal1 = this;
while (viewGroupInternal1 != null)
{
int index1 = 0;
for (int count = viewGroupInternal1.Items.Count; index1 < count && (index >= 0 || !object.Equals(item, viewGroupInternal1.Items[index1])) && index != index1; ++index1)
{
CollectionViewGroupInternal viewGroupInternal2 = viewGroupInternal1.Items[index1] as CollectionViewGroupInternal;
num += viewGroupInternal2 == null ? 1 : viewGroupInternal2.ItemCount;
}
item = (object)viewGroupInternal1;
viewGroupInternal1 = viewGroupInternal1.Parent;
index = -1;
}
return(num);
}
private bool RemoveFromSubgroup(object item, CollectionViewGroupInternal group, int level, object name)
{
bool flag = false;
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))
{
if (this.RemoveFromSubgroups(item, group1, level + 1))
{
flag = true;
}
return(flag);
}
}
return(true);
}
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;
}
protected void ChangeCounts(object item, int delta)
{
bool flag = !(item is CollectionViewGroup);
for (CollectionViewGroupInternal group = this; group != null; group = group.parentGroup)
{
group.FullCount += delta;
if (flag)
{
CollectionViewGroupInternal viewGroupInternal = group;
int num = viewGroupInternal.ProtectedItemCount + delta;
viewGroupInternal.ProtectedItemCount = num;
if (group.ProtectedItemCount == 0)
{
this.RemoveEmptyGroup(group);
}
}
}
++this.version;
}
public LeafEnumerator(CollectionViewGroupInternal group)
{
this.group = group;
this.DoReset();
}
internal CollectionViewGroupInternal(object name, CollectionViewGroupInternal parent)
: base(name)
{
this.parentGroup = parent;
}