private IEnumerable <IVisual> HitTest(IVisualNode node, Point p, Rect?clip, Func <IVisual, bool> filter)
{
if (filter?.Invoke(node.Visual) != false)
{
var clipped = false;
if (node.ClipToBounds)
{
clip = clip == null ? node.ClipBounds : clip.Value.Intersect(node.ClipBounds);
clipped = !clip.Value.Contains(p);
}
if (node.GeometryClip != null)
{
var controlPoint = Root.Visual.TranslatePoint(p, node.Visual);
clipped = !node.GeometryClip.FillContains(controlPoint);
}
if (!clipped)
{
for (var i = node.Children.Count - 1; i >= 0; --i)
{
foreach (var h in HitTest(node.Children[i], p, clip, filter))
{
yield return(h);
}
}
if (node.HitTest(p) && node.Visual.IsAttachedToVisualTree)
{
yield return(node.Visual);
}
}
}
}
