private void RemoveGroup(DataGridCollectionViewGroup group)
{
if (group == null)
{
throw new ArgumentNullException("group");
}
Debug.Assert(this == group.m_parent);
// We do not remove group forced in SubGroupBy.GroupNames
if (group.UnsortedIndex < this.SubGroupBy.GroupNames.Count)
{
return;
}
Debug.Assert(!this.IsBottomLevel);
Debug.Assert((group.m_globalRawItemCount == 0) && (group.ProtectedItemCount == 0));
m_subGroups.Remove(DataGridCollectionViewGroup.GetHashKeyFromName(group.Name));
this.ProtectedItemCount--;
this.ProtectedItems.Remove(group);
if ((m_subGroups.Count == 0) && (m_parent != null))
{
m_parent.RemoveGroup(this);
}
}
internal bool Contains(object item)
{
var group = item as DataGridCollectionViewGroup;
if (group != null)
{
//Must make sure the group the group is ref equals, because there can be groups with a null name at more than one level.
DataGridCollectionViewGroup foundGroup;
if (m_subGroups.TryGetValue(DataGridCollectionViewGroup.GetHashKeyFromName(group.Name), out foundGroup))
{
return(foundGroup == group);
}
return(false);
}
DataGridCollectionView collectionView = this.GetCollectionView();
if (collectionView != null)
{
RawItem rawItem = collectionView.GetFirstRawItemFromDataItem(item);
if (rawItem != null)
{
return(rawItem.ParentGroup == this);
}
}
return(false);
}
private void InsertGroup(int index, DataGridCollectionViewGroup group)
{
Debug.Assert(!this.IsBottomLevel);
m_subGroups.Add(DataGridCollectionViewGroup.GetHashKeyFromName(group.Name), group);
this.ProtectedItemCount++;
this.ProtectedItems.Insert(index, group);
}
internal DataGridCollectionViewGroup GetGroup(
RawItem rawItem,
int level,
CultureInfo culture,
ObservableCollection <GroupDescription> groupByList,
List <GroupSortComparer> groupSortComparers)
{
// If sortComparers is null, we are in massive group creation, no order check.
if (this.IsBottomLevel)
{
throw new InvalidOperationException("An attempt was made to get a group for which a GroupDescription has not been provided.");
}
object groupName = m_subGroupBy.GroupNameFromItem(rawItem.DataItem, level, culture);
DataGridCollectionViewGroup group;
if ((m_subGroupBy is DataGridGroupDescription) || (m_subGroupBy is PropertyGroupDescription))
{
m_subGroups.TryGetValue(DataGridCollectionViewGroup.GetHashKeyFromName(groupName), out group);
}
else
{
//If dealing with an unknown GroupDescription type, use the standard method to retrieve a group, in case group retrival is handle differently.
group = null;
foreach (var tempGroup in m_subGroups.Values)
{
if (m_subGroupBy.NamesMatch(tempGroup.Name, groupName))
{
group = tempGroup;
break;
}
}
}
if (group == null)
{
group = this.CreateSubGroup(groupName, level, groupByList, groupSortComparers);
}
return(group);
}
