/// <summary>
/// Starts an animation for a DependencyProperty. The animation will
/// begin when the next frame is rendered.
/// </summary>
/// <param name="dp">
/// The DependencyProperty to animate.
/// </param>
/// <param name="animation">
/// <para>The AnimationTimeline to used to animate the property.</para>
/// <para>If the AnimationTimeline's BeginTime is null, any current animations
/// will be removed and the current value of the property will be held.</para>
/// <para>If this value is null, all animations will be removed from the property
/// and the property value will revert back to its base value.</para>
/// </param>
/// <param name="handoffBehavior">
/// Specifies how the new animation should interact with any current
/// animations already affecting the property value.
/// </param>
public void BeginAnimation(DependencyProperty dp, AnimationTimeline animation, HandoffBehavior handoffBehavior)
{
if (dp == null)
{
throw new ArgumentNullException("dp");
}
if (!AnimationStorage.IsPropertyAnimatable(this, dp))
{
#pragma warning disable 56506 // Suppress presharp warning: Parameter 'dp' to this public method must be validated: A null-dereference can occur here.
throw new ArgumentException(SR.Get(SRID.Animation_DependencyPropertyIsNotAnimatable, dp.Name, this.GetType()), "dp");
#pragma warning restore 56506
}
if (animation != null &&
!AnimationStorage.IsAnimationValid(dp, animation))
{
throw new ArgumentException(SR.Get(SRID.Animation_AnimationTimelineTypeMismatch, animation.GetType(), dp.Name, dp.PropertyType), "animation");
}
if (!HandoffBehaviorEnum.IsDefined(handoffBehavior))
{
throw new ArgumentException(SR.Get(SRID.Animation_UnrecognizedHandoffBehavior));
}
if (IsSealed)
{
throw new InvalidOperationException(SR.Get(SRID.IAnimatable_CantAnimateSealedDO, dp, this.GetType()));
}
AnimationStorage.BeginAnimation(this, dp, animation, handoffBehavior);
}
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);
}
