void AddInSubtree(StandardCollectionViewGroup group, object item, CultureInfo culture, IList <GroupDescription> descriptions, bool allowSorting)
{
int depth = group.Depth;
if (group.IsBottomLevel)
{
group.AddItem(item, allowSorting, WrappedList);
CollectionChanged.Raise(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item, IndexOfSubtree(item)));
}
else
{
var desc = descriptions [group.Depth];
var groupNames = desc.GroupNameFromItem(item, group.Depth, culture);
if (groupNames is IList)
{
foreach (var name in (IList)groupNames)
{
AddInSubtree(group, item, culture, descriptions, allowSorting, name);
}
}
else
{
AddInSubtree(group, item, culture, descriptions, allowSorting, groupNames);
}
}
}
void AddInSubtree(StandardCollectionViewGroup group, object item, CultureInfo culture, IList <GroupDescription> descriptions, bool allowSorting, object name)
{
bool added = false;
foreach (StandardCollectionViewGroup g in group.Items)
{
var desc = descriptions [group.Depth];
if (desc.NamesMatch(g.Name, name))
{
AddInSubtree(g, item, culture, descriptions, allowSorting);
added = true;
}
}
if (!added)
{
int depth = group.Depth + 1;
var g = new StandardCollectionViewGroup(group, name, depth, depth == descriptions.Count, group.Sorters);
group.AddItem(g, allowSorting, WrappedList);
AddInSubtree(g, item, culture, descriptions, allowSorting);
}
}
bool IndexOfSubtree(StandardCollectionViewGroup group, object item, ref int index)
{
for (int i = 0; i < group.Items.Count; i++)
{
var v = group.Items [i];
if (v == item)
{
return(true);;
}
else if (v is StandardCollectionViewGroup)
{
if (IndexOfSubtree((StandardCollectionViewGroup)v, item, ref index))
{
return(true);
}
}
else
{
index++;
}
}
return(false);
}
bool RemoveInSubtree(StandardCollectionViewGroup group, object item, ref int index)
{
// The same item can exist in multiple groups. We need to remove it from every group
// and emit the CollectionChanged event with the correct index.
bool removed = false;
for (int i = 0; i < group.Items.Count; i++)
{
var groupItem = group.Items [i];
if (groupItem is StandardCollectionViewGroup)
{
var subGroup = (StandardCollectionViewGroup)groupItem;
removed |= RemoveInSubtree(subGroup, item, ref index);
if (subGroup.Items.Count == 0)
{
i--;
group.RemoveItem(subGroup);
}
}
else if (groupItem == item)
{
// If we remove the item, the next item we check will be at
// the same index, so do not increment it here.
removed = true;
group.RemoveItem(item);
i--;
CollectionChanged.Raise(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item, index));
}
else
{
// We only need to increment the index if we do *not* remove the item.
index++;
}
}
return(removed);
}
public RootCollectionViewGroup(IList wrappedList, StandardCollectionViewGroup parent, object name, int depth, bool isBottomLevel, SortDescriptionCollection sorters)
: base(parent, name, depth, isBottomLevel, sorters)
{
WrappedList = wrappedList;
}
