internal static IEnumerable <T> GetElementsInHostCoordinates <T>(this UIElement subtree, Point position) where T : UIElement
{
if (subtree == null)
{
return(Enumerable.Empty <T>());
}
var elements = new List <T>(50);
UIElement root = ApplicationHelper.GetRootVisual(subtree);
VisualTreeHelper.HitTest(subtree,
null,
r =>
{
UIElement e = r.VisualHit as UIElement;
var localElements = new List <UIElement>(50);
while (e != null)
{
if (e.Visibility == Visibility.Visible)
{
localElements.Add(e);
}
else
{
localElements.Clear();
}
e = VisualTreeHelper.GetParent(e) as UIElement;
}
elements.AddRange(localElements.OfType <T>());
return(HitTestResultBehavior.Continue);
},
new PointHitTestParameters(position));
return(elements);
}
internal static IEnumerable <T> GetElementsInScreenCoordinates <T>(this FrameworkElement relativeTo, Point mousePosition) where T : UIElement
{
return(GetElementsInScreenCoordinates <T>(mousePosition, ApplicationHelper.GetRootVisual(relativeTo)));
}