public static IEnumerable <UIElement> ScreenHitTest(Point screenPoint)
{
#if SILVERLIGHT
var uielements = new List <UIElement>();
foreach (var visualRoot in PresentationTreeUtils.EnumerateVisualRoots().OfType <FrameworkElement>())
{
uielements.AddRange(VisualTreeHelper.FindElementsInHostCoordinates(screenPoint, visualRoot));
}
return(uielements);
#else
var uielements = new List <UIElement>();
foreach (var visualRoot in PresentationTreeUtils.EnumerateVisualRoots().OfType <FrameworkElement>().Where(fre => fre.Dispatcher.CheckAccess()))
{
VisualTreeHelper.HitTest(visualRoot, r =>
{
var uie = r as UIElement;
if (uie != null)
{
uielements.Add(uie);
}
return(HitTestFilterBehavior.Continue);
}, result => HitTestResultBehavior.Continue, new PointHitTestParameters(visualRoot.PointFromScreen(screenPoint)));
}
return(uielements.AsEnumerable().Reverse());
#endif
}
public static IEnumerable <UIElement> ScreenHitTest(Rect screenRect)
{
#if SILVERLIGHT
return(VisualTreeHelper.FindElementsInHostCoordinates(screenRect, Application.Current.RootVisual).ToList());
#else
var uielements = new List <UIElement>();
foreach (var visualRoot in PresentationTreeUtils.EnumerateVisualRoots().OfType <FrameworkElement>().Where(fre => fre.Dispatcher.CheckAccess()))
{
if (visualRoot.Dispatcher.CheckAccess() == false)
{
continue;
}
VisualTreeHelper.HitTest(visualRoot, r =>
{
var uie = r as UIElement;
if (uie != null)
{
uielements.Add(uie);
}
return(HitTestFilterBehavior.Continue);
}, result => HitTestResultBehavior.Continue, new GeometryHitTestParameters(new RectangleGeometry(visualRoot.TransformRectToClient(screenRect))));
}
return(uielements.AsEnumerable().Reverse());
#endif
}
public override DependencyObject GetAncestor(DependencyObject dependencyObject)
{
if (dependencyObject == null)
{
return(null);
}
if (_disconnectedTree)
{
var disconnectedParent = PresentationTreeUtils.GetDisconnectedParent(dependencyObject);
if (disconnectedParent != null)
{
return(disconnectedParent);
}
}
return(_firstStrategy.GetAncestor(dependencyObject) ?? _secondStrategy.GetAncestor(dependencyObject));
}
public override DependencyObject GetAncestor(DependencyObject dependencyObject)
{
return(PresentationTreeUtils.GetLogicalParent(dependencyObject));
}