public static IList <object> GetItems(this Group group)
{
CollectionViewGroup collectionViewGroup = group.CollectionViewGroup;
if (collectionViewGroup == null)
{
return(null);
}
return(collectionViewGroup.GetItems());
}
internal static object GetLastLeafItem(this CollectionViewGroup collectionViewGroup)
{
IList <object> items = collectionViewGroup.GetItems();
if (items.Count == 0)
{
return(null);
}
var item = items[items.Count - 1];
var subGroup = item as CollectionViewGroup;
return((subGroup != null)
? subGroup.GetLastLeafItem()
: item);
}
internal static IEnumerable <object> GetLeafItems(this CollectionViewGroup collectionViewGroup)
{
foreach (var item in collectionViewGroup.GetItems())
{
if (item is CollectionViewGroup)
{
foreach (var subItem in (( CollectionViewGroup )item).GetLeafItems())
{
yield return(subItem);
}
}
else
{
yield return(item);
}
}
}
public GeneratorNode CreateGroupGeneratorNode(
CollectionViewGroup collectionViewGroup,
GeneratorNode parent,
GeneratorNode previous,
GeneratorNode next,
GroupConfiguration groupConfig)
{
Debug.Assert(collectionViewGroup != null, "collectionViewGroup cannot be null for CreateGroupGeneratorNode()");
GroupGeneratorNode node = new GroupGeneratorNode(collectionViewGroup, parent, groupConfig);
if (previous != null)
{
previous.Next = node;
}
node.Previous = previous;
if (next != null)
{
next.Previous = node;
}
node.Next = next;
node.IsExpanded = groupConfig.InitiallyExpanded;
if (collectionViewGroup.IsBottomLevel == false)
{
IList <object> subItems = collectionViewGroup.GetItems();
this.RegisterNodeCollectionChanged(
( INotifyCollectionChanged )subItems,
new NotifyCollectionChangedEventHandler(node.OnCollectionChanged));
node.CollectionChanged += m_groupsChangedHandler;
}
node.ExpansionStateChanged += m_expansionStateChangedHandler;
node.IsExpandedChanging += m_isExpandedChangingHandler;
node.IsExpandedChanged += m_isExpandedChangedHandler;
node.AdjustItemCount(node.ItemCount);
node.BuildNamesTree();
return(node);
}
internal static IEnumerable <CollectionViewGroup> GetSubGroups(this CollectionViewGroup collectionViewGroup)
{
foreach (var item in collectionViewGroup.GetItems())
{
var subGroup = item as CollectionViewGroup;
//No need to check every items, they will be all Groups or not.
if (subGroup == null)
{
break;
}
yield return(subGroup);
foreach (var subSubgroup in subGroup.GetSubGroups())
{
yield return(subGroup);
}
}
}