int IndexOf(object item)
{
if (Grouping)
{
return(RootGroup.IndexOfSubtree(item));
}
else
{
return(ActiveList.IndexOf(item));
}
}
public override object AddNew()
{
ThrowIfDeferred();
if (ItemConstructor == null)
{
throw new InvalidOperationException("The underlying collection does not support adding new items");
}
if (SourceCollection.IsFixedSize)
{
throw new InvalidOperationException("The source collection is of fixed size");
}
// If there's an existing AddNew or Edit, we commit it. Commit the edit first because
// we're not allowed CommitNew if we're in the middle of an edit.
if (IsEditingItem)
{
CommitEdit();
}
if (IsAddingNew)
{
CommitNew();
}
var newObject = ItemConstructor.Invoke(null);
// FIXME: I need to check the ordering on the events when the source is INCC
CurrentAddItem = newObject;
IsAddingNew = true;
if (Grouping)
{
RootGroup.AddItem(newObject, false, SourceCollection);
HandleRootGroupCollectionChanged(RootGroup, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, newObject, RootGroup.IndexOfSubtree(newObject)));
}
AddToSourceCollection(newObject);
MoveCurrentTo(newObject);
if (newObject is IEditableObject)
{
((IEditableObject)newObject).BeginEdit();
}
UpdateCanAddNewAndRemove();
return(newObject);
}