static UIElement GetClosest(
ItemsControl itemsControl,
List<DependencyObject> items,
Point position,
Orientation searchDirection)
{
UIElement closest = null;
var closestDistance = double.MaxValue;
foreach (var i in items)
{
var uiElement = i as UIElement;
if (uiElement != null)
{
if (!itemsControl.IsAncestorOf(uiElement))
continue;
var p = uiElement.TransformToAncestor(itemsControl).Transform(new Point(0, 0));
var distance = double.MaxValue;
if (itemsControl is TreeView)
{
var xDiff = position.X - p.X;
var yDiff = position.Y - p.Y;
var hyp = Math.Sqrt(Math.Pow(xDiff, 2d) + Math.Pow(yDiff, 2d));
distance = Math.Abs(hyp);
}
else
{
switch (searchDirection)
{
case Orientation.Horizontal:
distance = Math.Abs(position.X - p.X);
break;
case Orientation.Vertical:
distance = Math.Abs(position.Y - p.Y);
break;
}
}
if (distance < closestDistance)
{
closest = uiElement;
closestDistance = distance;
}
}
}
return closest;
}