CompletionVM GetExistingCompletionVM(Completion completion)
{
if (completion == null)
{
return(null);
}
var vm = CompletionVM.TryGet(completion);
Debug.Assert(vm != null);
return(vm);
}
void CompletionList_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
int i;
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
Debug.Assert(e.NewItems != null);
i = e.NewStartingIndex;
var newList = new List <CompletionVM>();
foreach (Completion c in e.NewItems)
{
var vm = GetOrCreateVM(c);
newList.Add(vm);
list.Insert(i++, vm);
}
CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, newList, e.NewStartingIndex));
break;
case NotifyCollectionChangedAction.Remove:
Debug.Assert(e.OldItems != null);
var oldList = new List <CompletionVM>();
foreach (Completion c in e.OldItems)
{
var vm = CompletionVM.TryGet(c);
oldList.Add(vm);
Debug.Assert(list[e.OldStartingIndex].Completion == vm?.Completion);
list.RemoveAt(e.OldStartingIndex);
}
CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, oldList, e.NewStartingIndex));
break;
case NotifyCollectionChangedAction.Replace:
throw new NotSupportedException();
case NotifyCollectionChangedAction.Move:
throw new NotSupportedException();
case NotifyCollectionChangedAction.Reset:
ReinitializeList();
CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
break;
default:
Debug.Fail($"Unknown action: {e.Action}");
break;
}
}
CompletionVM GetOrCreateVM(Completion completion) => CompletionVM.TryGet(completion) ?? new CompletionVM(completion, imageMonikerService);