private void OnSourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
void Add(TKey key, TValue value)
{
_view[key] = _selector(value);
if (value is INotifyPropertyChanged o)
{
o.PropertyChanged -= OnSourceItemPropertyChanged;
o.PropertyChanged += OnSourceItemPropertyChanged;
}
}
void AddRange(IEnumerable enumerable)
{
foreach (var(key, value) in enumerable.OfType <KeyValuePair <TKey, TValue> >())
{
Add(key, value);
}
}
void Remove(TKey key, TValue value)
{
if (_view.ContainsKey(key))
{
_view.Remove(key);
}
if (value is INotifyPropertyChanged o)
{
o.PropertyChanged -= OnSourceItemPropertyChanged;
}
}
void RemoveRange(IEnumerable enumerable)
{
foreach (var(key, value) in enumerable.OfType <KeyValuePair <TKey, TValue> >())
{
Remove(key, value);
}
}
if (e.Action == NotifyCollectionChangedAction.Add)
{
AddRange(e.NewItems);
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
RemoveRange(e.OldItems);
}
else if (e.Action == NotifyCollectionChangedAction.Replace)
{
RemoveRange(e.OldItems);
AddRange(e.NewItems);
}
else if (e.Action == NotifyCollectionChangedAction.Reset)
{
foreach (var(key, value) in _dictionary)
{
Remove(key, _dictionary[key]);
}
_view.Clear();
}
else if (e.Action == NotifyCollectionChangedAction.Move)
{
}
}