public IMemento Restore()
{
var memento = new NotifyCollectionChangeMemento
{
List = List,
Action = GetInvertedAction(Action),
OldIndex = NewIndex,
OldValue = NewValue,
NewIndex = OldIndex,
NewValue = OldValue
};
switch (Action)
{
case NotifyCollectionChangeAction.Add:
List.RemoveAt(NewIndex);
break;
case NotifyCollectionChangeAction.Remove:
List.Insert(OldIndex, OldValue);
break;
case NotifyCollectionChangeAction.Replace:
throw new NotImplementedException();
}
return(memento);
}
private void LogCollectionChanged(NotifyCollectionChangeMemento memento, NotifyCollectionChangingEventArgs e)
{
if (!EventSettings.EnableLogging)
return;
if (InEditableObjectAction())
{
if (e.Action == NotifyCollectionChangeAction.Replace)
{
log.DebugFormat("adding collection change to edit action {0}: index:{1} {2} -> {3}", memento.Action,
memento.Index, memento.OldValue ?? "null", memento.NewValue ?? "null");
}
else
{
log.DebugFormat("adding collection change to edit action {0}: index:{1} {2}", memento.Action,
memento.Index, memento.NewValue ?? "null");
}
}
else
{
if (e.Action == NotifyCollectionChangeAction.Replace)
{
log.DebugFormat("saving undo for collection change {0}: index:{1} {2} -> {3}", memento.Action,
memento.Index, memento.OldValue ?? "null", memento.NewValue ?? "null");
}
else
{
log.DebugFormat("saving undo for collection change {0}: index: {1} {2}", memento.Action,
memento.Index, memento.NewValue ?? "null");
}
}
}
