private void EnsureImplicitAnimations()
{
if (_implicitAnimations == null)
{
var compositor = ElementComposition.GetElementVisual(this) !.Compositor;
var offsetAnimation = compositor.CreateVector3KeyFrameAnimation();
offsetAnimation.Target = "Offset";
offsetAnimation.InsertExpressionKeyFrame(1.0f, "this.FinalValue");
offsetAnimation.Duration = TimeSpan.FromMilliseconds(400);
var rotationAnimation = compositor.CreateScalarKeyFrameAnimation();
rotationAnimation.Target = "RotationAngle";
rotationAnimation.InsertKeyFrame(.5f, 0.160f);
rotationAnimation.InsertKeyFrame(1f, 0f);
rotationAnimation.Duration = TimeSpan.FromMilliseconds(400);
var animationGroup = compositor.CreateAnimationGroup();
animationGroup.Add(offsetAnimation);
animationGroup.Add(rotationAnimation);
_implicitAnimations = compositor.CreateImplicitAnimationCollection();
_implicitAnimations["Offset"] = animationGroup;
}
}
public static void SetEnableAnimations(Border border, bool value)
{
var page = border.FindAncestorOfType <CompositionPage>();
if (page == null)
{
border.AttachedToVisualTree += delegate { SetEnableAnimations(border, true); };
return;
}
if (ElementComposition.GetElementVisual(page) == null)
{
return;
}
page.EnsureImplicitAnimations();
if (border.GetVisualParent() is Visual visualParent &&
ElementComposition.GetElementVisual(visualParent) is CompositionVisual compositionVisual)
{
compositionVisual.ImplicitAnimations = page._implicitAnimations;
}
}