Alternative to ItemContainerGenerator with LongListSelector in WP8? - windows-phone-8

Question

is there an alternative to ItemContainerGenerator when working with a grouped LongListSelector?
I have a context menu on every ListBoxItem. One option is "delete item". This works fine with the following code (not really neat, but it works; better ways to implement?):
private void deleteItem(object sender, RoutedEventArgs e)
{
ViewModel drink = (sender as FrameworkElement).DataContext as ViewModel;
for (int i = 0; i < LLSGroups.Count; i++)
{
if (LLSGroups[i].Remove(drink))
break;
}
}
I'd like to animate the item upon deletion. Therefore I need the FrameworkElement of that ListBoxItem. With a usual ListBox it works with
FrameworkElement element = (MyList.ItemContainerGenerator.ContainerFromItem(((MenuItem)sender).DataContext) as ListBoxItem) as FrameworkElement;
The Problem: LongListSelectors do not implement ItemContainerGenerator. How do I get the FrameworkElement for the animation?
Best Regards,
Marc

Answer 1

I build a workaround with the VisualTreeHelper: The input consists of the element which should be searched through and the element I like to find.
private FrameworkElement SearchVisualTree(DependencyObject targetElement, DependencyObject comp)
{
FrameworkElement res = null;
var count = VisualTreeHelper.GetChildrenCount(targetElement);
if (count == 0)
return res;
for (int i = 0; i < count; i++)
{
var child = VisualTreeHelper.GetChild(targetElement, i);
if ((child as FrameworkElement).DataContext == (comp as FrameworkElement).DataContext)
{
res = child as FrameworkElement;
return res;
}
else
{
res = SearchVisualTree(child, comp);
if (res != null)
return res;
}
}
return res;
}
The call looks like this:
FrameworkElement element = SearchVisualTree(myList, (sender as FrameworkElement));
This works fine for manipulations on a visiual list element =)