/// <summary>
/// Measure adorner.
/// </summary>
protected override Size MeasureOverride(Size constraint)
{
Debug.Assert(child != null, "_child should not be null");
if (ReferenceElement != null && AdornedElement != null &&
AdornedElement.IsMeasureValid &&
!AreClose(ReferenceElement.DesiredSize, AdornedElement.DesiredSize))
{
ReferenceElement.InvalidateMeasure();
}
child.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
return(child.DesiredSize);
}
