private DataGridCollectionViewGroup CreateSubGroup(object groupName, int level, ObservableCollection <GroupDescription> groupByList,
List <GroupSortComparer> groupSortComparers)
{
// If sortComparers is null, we are in massive group creation, no order check.
var group = new DataGridCollectionViewGroup(groupName, this, m_nextSubGroupUnsortedIndex);
var dataGridGroupDescription = groupByList[level] as DataGridGroupDescription;
if (dataGridGroupDescription != null)
{
group.GroupByName = dataGridGroupDescription.PropertyName;
}
unchecked
{
m_nextSubGroupUnsortedIndex++;
}
int index;
if (groupSortComparers == null)
{
Debug.Assert(this.ProtectedItemCount == this.ProtectedItems.Count);
index = this.ProtectedItemCount;
}
else
{
index = this.BinarySearchGroup(group, groupSortComparers[level]);
if (index < 0)
{
index = ~index;
}
}
level++;
if (level < groupByList.Count)
{
group.SetSubGroupBy(groupByList[level]);
group.CreateFixedGroupNames(level, groupByList, groupSortComparers);
}
this.InsertGroup(index, group);
return(group);
}
private DataGridCollectionViewGroup CreateSubGroup( object groupName, int level, ObservableCollection<GroupDescription> groupByList, GroupSortComparer[] groupSortComparers )
{
// If sortComparers is null, we are in massive group creation, no order check.
DataGridCollectionViewGroup group = new DataGridCollectionViewGroup( groupName, this, m_nextSubGroupUnsortedIndex );
unchecked
{
m_nextSubGroupUnsortedIndex++;
}
int index;
if( groupSortComparers == null )
{
Debug.Assert( this.ProtectedItemCount == this.ProtectedItems.Count );
index = this.ProtectedItemCount;
}
else
{
index = this.BinarySearchGroup( group, groupSortComparers[ level ] );
if( index < 0 )
index = ~index;
}
level++;
if( level < groupByList.Count )
{
group.SetSubGroupBy( groupByList[ level ] );
group.CreateFixedGroupNames( level, groupByList, groupSortComparers );
}
this.InsertGroup( index, group );
return group;
}
