public StandardCollectionViewGroup(StandardCollectionViewGroup parent, object name, int depth, bool isBottomLevel, SortDescriptionCollection sorters)
: base(name)
{
this.isBottomLevel = isBottomLevel;
Depth = depth;
Parent = parent;
Sorters = sorters;
}
public StandardCollectionViewGroup (StandardCollectionViewGroup parent, object name, int depth, bool isBottomLevel, SortDescriptionCollection sorters)
: base (name)
{
this.isBottomLevel = isBottomLevel;
Depth = depth;
Parent = parent;
Sorters = sorters;
}
void AddInSubtree (StandardCollectionViewGroup group, object item, CultureInfo culture, IList<GroupDescription> descriptions, bool allowSorting)
{
int depth = group.Depth;
if (group.IsBottomLevel) {
group.AddItem (item, allowSorting);
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);
AddInSubtree (g, item, culture, descriptions, allowSorting);
}
}
public override void Refresh ()
{
if (IsAddingNew || IsEditingItem)
throw new InvalidOperationException ("Cannot refresh while adding or editing an item");
if (((IDeferRefresh) this).DeferLevel != 0)
return;
if (RootGroup == null)
RootGroup = new StandardCollectionViewGroup (null, null, 0, false, SortDescriptions);
Groups = null;
RootGroup.ClearItems ();
if (ActiveList != SourceCollection) {
filteredList.Clear ();
foreach (var item in SourceCollection)
AddToFiltered (item, false);
if (SortDescriptions.Count > 0)
filteredList.Sort (new PropertyComparer (SortDescriptions));
if (GroupDescriptions.Count > 0 && filteredList.Count > 0) {
foreach (var item in filteredList)
RootGroup.AddInSubtree (item, Culture, GroupDescriptions, false);
Groups = RootGroup.Items;
}
}
IsEmpty = ActiveList.Count == 0;
int index = IndexOf (CurrentItem);
if (index < 0 && CurrentPosition != -1 && !IsEmpty)
index = 0;
RaiseCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction.Reset));
MoveCurrentTo (index, true);
}
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;
}
public RootCollectionViewGroup (StandardCollectionViewGroup parent, object name, int depth, bool isBottomLevel, SortDescriptionCollection sorters)
: base (parent, name, depth, isBottomLevel, sorters)
{
}
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;
}
internal void AddInSubtree (object item, CultureInfo culture, IList<GroupDescription> descriptions, bool allowSorting, object name)
{
bool added = false;
foreach (StandardCollectionViewGroup group in Items) {
var desc = descriptions [Depth];
if (desc.NamesMatch (group.Name, name)) {
group.AddInSubtree (item, culture, descriptions, allowSorting);
added = true;
}
}
if (!added) {
int depth = Depth + 1;
var group = new StandardCollectionViewGroup (this, name, depth, depth == descriptions.Count, Sorters);
AddItem (group, allowSorting);
group.AddInSubtree (item, culture, descriptions, allowSorting);
}
}