public static void AnimatePropertyTo <T, R, AT>(this T element, Expression <Func <T, R> > p, R finalValue, double duration, bool autoReverse)
where T : IAnimatable
where AT : AnimationTimeline
{
AnimationTimeline animation = (AnimationTimeline)Activator.CreateInstance(typeof(AT));
if (animation == null)
{
return;
}
var prop = (p.Body as MemberExpression).Member.Name;
var currentValue = p.Compile()(element);
DependencyPropertyDescriptor dFrom = DependencyPropertyDescriptor.FromName("From", animation.GetType(), animation.GetType());
animation.SetValue(dFrom.DependencyProperty, currentValue);
DependencyPropertyDescriptor dTo = DependencyPropertyDescriptor.FromName("To", animation.GetType(), animation.GetType());
animation.SetValue(dTo.DependencyProperty, finalValue);
animation.Duration = new Duration(TimeSpan.FromSeconds(duration));
animation.AutoReverse = autoReverse;
DependencyPropertyDescriptor d = DependencyPropertyDescriptor.FromName(prop, typeof(T), typeof(T));
element.BeginAnimation(d.DependencyProperty, null);
element.BeginAnimation(d.DependencyProperty, animation);
}
