private static void OnComparerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CollectionSortBehavior behavior = (CollectionSortBehavior)d;
SortComparer oldComparer = (SortComparer)e.OldValue;
behavior.UnregisterComparer(oldComparer);
SortComparer newComparer = (SortComparer)e.NewValue;
behavior.RegisterComparer(newComparer);
behavior.SortItems();
}
private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CollectionSortBehavior behavior = (CollectionSortBehavior)d;
IEnumerable oldSource = (IEnumerable)e.OldValue;
behavior.UnregisterItemsSource(oldSource);
IEnumerable newSource = (IEnumerable)e.NewValue;
behavior.RegisterItemsSource(newSource);
SortComparer comparer = behavior.Comparer;
if (comparer != null)
{
comparer.ItemsSource = newSource;
}
behavior.SortItems();
}
private void OnItemsChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
{
AddSortedItem(Comparer, SortedItems, e.NewItems[0]);
break;
}
case NotifyCollectionChangedAction.Remove:
{
RemSortedItem(Comparer, SortedItems, e.OldItems[0]);
break;
}
case NotifyCollectionChangedAction.Replace:
{
SortComparer comparer = Comparer;
SortedCollection sorted = SortedItems;
RemSortedItem(comparer, sorted, e.OldItems[0]);
AddSortedItem(comparer, sorted, e.NewItems[0]);
break;
}
case NotifyCollectionChangedAction.Move:
{
// nothing to do
break;
}
case NotifyCollectionChangedAction.Reset:
{
SortItems();
break;
}
}
}