protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
if (this.NativeView == null)
{
return;
}
//Accessing page numbers from the ScrollView abstraction renderer
AnimatedScrollView animatedScrollView = (AnimatedScrollView)Element;
_pages = animatedScrollView.NumberOfPage;
nativeScrollView = (UIScrollView)this.NativeView;
nativeScrollView.ContentSize = new CGSize(_pages * (float)this.NativeView.Frame.Width, (float)this.NativeView.Frame.Height);
//TODO: Put these 2 parameters into the Abstraction renderer
nativeScrollView.PagingEnabled = true;
nativeScrollView.ShowsHorizontalScrollIndicator = false;
//
_isAtEnd = false;
Animator = new Animator();
ScrollView = new UIScrollView(nativeScrollView.Bounds);
ScrollView.Scrolled += (sender, args) =>
{
Animator.Animate(Convert.ToInt32(ScrollView.ContentOffset.X));
_isAtEnd = ScrollView.ContentOffset.X >= MaxContentOffsetXForScrollView(ScrollView);
//animatedScrolledService = ScrollView.Delegate;
if (_isAtEnd && this.RespondsToSelector(new Selector("AnimatedScrollViewControllerDidScrollToEnd:")))
{
//animatedScrolledService.AnimatedScrollViewControllerDidScrollToEnd(this);
}
};
ScrollView.ScrollAnimationEnded += (sender, args) =>
{
//WeakDelegate = scrollView.Delegate;
//animatedScrolledService = ScrollView.Delegate;
if (_isAtEnd && this.RespondsToSelector(new Selector("AnimatedScrollViewControllerDidEndDraggingAtEnd:")))
{
//animatedScrolledService.AnimatedScrollViewControllerDidEndDraggingAtEnd(this);
}
};
nativeScrollView.Add(ScrollView);
}
public XFScrollViewSamplePage()
{
InitializeComponent();
var animatedView = new AnimatedView();
animatedView.BackgroundColor = Color.Black;
animatedView.WidthRequest = 50;
animatedView.HeightRequest = 50;
var scrollView = new AnimatedScrollView();
scrollView.NumberOfPage = 2;
scrollView.Content = new StackLayout
{
Children =
{
animatedView
}
};
//Animations
//var alphaAnimation = new CrossScrollViewAnimations();
//Animator.Add
var alphaAnimation = CrossScrollViewAnimations.Current.AlphaAnimation(animatedView, 1);
var animator = new Animator();
animator.AddAnimation(alphaAnimation);
alphaAnimation.AddKeyFrame(new AnimationFrame()
{
Time = TimeForPage(1),
Alpha = 0.0f
});
alphaAnimation.AddKeyFrame(new AnimationFrame()
{
Time = TimeForPage(2),
Alpha = 1.0f
});
}
