/// <summary>
/// Returns the topmost active input element at a point on an <see cref="IInputElement"/>.
/// </summary>
/// <param name="element">The element to test.</param>
/// <param name="p">The point on <paramref name="element"/>.</param>
/// <returns>The topmost <see cref="IInputElement"/> at the specified position.</returns>
public static IInputElement InputHitTest(this IInputElement element, Point p)
{
return(element.GetInputElementsAt(p).FirstOrDefault());
}
private void SetPointerOver(IPointerDevice device, IInputElement element, Point p)
{
IEnumerable<IInputElement> hits = element.GetInputElementsAt(p);
foreach (var control in this.pointerOvers.Except(hits).ToList())
{
PointerEventArgs e = new PointerEventArgs
{
RoutedEvent = InputElement.PointerLeaveEvent,
Device = device,
OriginalSource = control,
Source = control,
};
this.pointerOvers.Remove(control);
control.RaiseEvent(e);
}
foreach (var control in hits.Except(this.pointerOvers))
{
PointerEventArgs e = new PointerEventArgs
{
RoutedEvent = InputElement.PointerEnterEvent,
Device = device,
OriginalSource = control,
Source = control,
};
this.pointerOvers.Add(control);
control.RaiseEvent(e);
}
}
