private void OnMainPageLoaded(object sender, RoutedEventArgs e)
{
var compositor = this.Visual().Compositor;
// Set implicit animations for all Rectangles inside the StackPanel.
foreach (var element in Container.Children)
{
var rectangle = element as Rectangle;
rectangle?.Visual().EnableImplicitAnimation(VisualPropertyType.Offset, delay: 0.0f * Container.Children.IndexOf(rectangle));
}
var originalOffsetYOfMyRectangle = MyRectangle.OffsetY(Container);
var hideOpacityAnimation = compositor.CreateScalarKeyFrameAnimation();
hideOpacityAnimation.InsertKeyFrame(1.0f, 0.0f);
hideOpacityAnimation.Duration = TimeSpan.FromMilliseconds(800);
hideOpacityAnimation.Target = "Opacity";
var hideOffsetAnimation = compositor.CreateVector3KeyFrameAnimation();
// 24.0f here is the left Margin of MyRectangle.
// -24.0f here is how much we want to move MyRectangle up.
hideOffsetAnimation.InsertKeyFrame(1.0f, new Vector3(24.0f, originalOffsetYOfMyRectangle - 24.0f, 0.0f));
hideOffsetAnimation.Duration = TimeSpan.FromMilliseconds(800);
hideOffsetAnimation.Target = "Offset";
var hideAnimationGroup = compositor.CreateAnimationGroup();
hideAnimationGroup.Add(hideOpacityAnimation);
hideAnimationGroup.Add(hideOffsetAnimation);
ElementCompositionPreview.SetImplicitHideAnimation(MyRectangle, hideAnimationGroup);
var showOpacityAnimation = compositor.CreateScalarKeyFrameAnimation();
showOpacityAnimation.InsertKeyFrame(1.0f, 1.0f);
showOpacityAnimation.Duration = TimeSpan.FromMilliseconds(800);
showOpacityAnimation.Target = "Opacity";
var showOffsetAnimation = compositor.CreateVector3KeyFrameAnimation();
showOffsetAnimation.InsertKeyFrame(1.0f, new Vector3(24.0f, originalOffsetYOfMyRectangle, 0.0f));
showOffsetAnimation.Duration = TimeSpan.FromMilliseconds(800);
showOffsetAnimation.Target = "Offset";
var showAnimationGroup = compositor.CreateAnimationGroup();
showAnimationGroup.Add(showOpacityAnimation);
showAnimationGroup.Add(showOffsetAnimation);
ElementCompositionPreview.SetImplicitShowAnimation(MyRectangle, showAnimationGroup);
}