public void NotifyValueWillBeRemoved <T>(ITrackableCollection <T> trackableCollection, T removed)
{
AssertNotLocked();
if (!_isEnabled)
{
return;
}
var list = trackableCollection as IList <T>;
if (list != null)
{
var index = list.IndexOf(removed);
if (index == -1)
{
return;
}
_changeHistory.Push(() => trackableCollection.InsertWithoutTracking(removed, index));
return;
}
if (trackableCollection.Contains(removed))
{
_changeHistory.Push(() => trackableCollection.AddWithoutTracking(removed));
}
}
public void NotifyCollectionWillBeCleared <T>(ITrackableCollection <T> trackableCollection)
{
AssertNotLocked();
if (!_isEnabled)
{
return;
}
var elements = trackableCollection.ToList();
if (elements.Count == 0)
{
return;
}
_changeHistory.Push(() =>
{
foreach (var element in elements)
{
trackableCollection.AddWithoutTracking(element);
}
});
}