private static void OnEnableIndexingChanged(DependencyObject depObj, DependencyPropertyChangedEventArgs e)
{
if (e.NewValue != null && e.NewValue is INotifyCollectionChanged)
{
ItemsControl control = depObj as ItemsControl;
if (control != null)
{
((INotifyCollectionChanged)e.NewValue).CollectionChanged += (sender, args) =>
{
var list = e.NewValue as IList;
if (args.Action == NotifyCollectionChangedAction.Move)
{
IndexManager.Move(list, args.OldStartingIndex, args.NewStartingIndex);
}
else if (args.Action == NotifyCollectionChangedAction.Add)
{
IndexManager.Add(list);
}
else if (args.Action == NotifyCollectionChangedAction.Remove)
{
IndexManager.Remove(list, args.OldStartingIndex);
}
};
}
}
}
