/// <summary>
/// Returns the set of weak references to the items
/// that must be animated.
/// </summary>
/// <returns>
/// A set of weak references to items sorted by their feathering index.
/// </returns>
private static IList <WeakReference> GetTargetsToAnimate()
{
List <WeakReference> references;
List <WeakReference> targets = new List <WeakReference>();
PhoneApplicationPage page = null;
PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
if (frame != null)
{
page = frame.Content as PhoneApplicationPage;
}
if (page == null)
{
return(null);
}
if (!_pagesToReferences.TryGetValue(page, out references))
{
return(null);
}
foreach (WeakReference r in references)
{
FrameworkElement target = r.Target as FrameworkElement;
// If target is null, skip.
if (target == null)
{
continue;
}
// If target is not on the screen, skip.
if (!IsOnScreen(target))
{
continue;
}
ListBox listBox = r.Target as ListBox;
LongListSelector longListSelector = r.Target as LongListSelector;
Pivot pivot = r.Target as Pivot;
if (listBox != null)
{
// If the target is a ListBox, feather its items individually.
listBox.GetItemsInViewPort(targets);
}
else if (longListSelector != null)
{
#if WP7
// If the target is a LongListSelector, feather its items individually.
ListBox child = longListSelector.GetFirstLogicalChildByType <ListBox>(false);
if (child != null)
{
child.GetItemsInViewPort(targets);
}
#else
longListSelector.GetItemsInViewPort(targets);
#endif
}
else if (pivot != null)
{
// If the target is a Pivot, feather the title and the headers individually.
ContentPresenter title = pivot.GetFirstLogicalChildByType <ContentPresenter>(false);
if (title != null)
{
targets.Add(new WeakReference(title));
}
PivotHeadersControl headers = pivot.GetFirstLogicalChildByType <PivotHeadersControl>(false);
if (headers != null)
{
targets.Add(new WeakReference(headers));
}
}
else
{
// Else, feather the target as a whole.
targets.Add(r);
}
}
return(targets);
}