private void bindChildAnimation(View child, int index, long duration)
{
bool expanded = mExpanded;
int centerX = Width / 2;
int centerY = Height / 2;
int radius = expanded ? 0 : mRadius;
int childCount = ChildCount;
float perDegrees = (mToDegrees - mFromDegrees) / (childCount - 1);
Rect frame = computeChildFrame(centerX, centerY, radius, mFromDegrees + index * perDegrees, mChildSize);
int toXDelta = frame.Left - child.Left;
int toYDelta = frame.Top - child.Top;
IInterpolator interpolator;
if (mExpanded)
interpolator = new AccelerateInterpolator();
else
interpolator = new OvershootInterpolator(1.5f);
long startOffset = computeStartOffset(childCount, mExpanded, index, 0.1f, duration, interpolator);
Animation animation = mExpanded ? createShrinkAnimation(0, toXDelta, 0, toYDelta, startOffset, duration,
interpolator) : createExpandAnimation(0, toXDelta, 0, toYDelta, startOffset, duration, interpolator);
bool isLast = getTransformedIndex(expanded, childCount, index) == childCount - 1;
var animationListener = new AnimationListener(isLast);
animationListener.OnAnimationEndEvent += () =>
{
PostDelayed(new Action(
() =>
{
onAllAnimationsEnd();
}), 0);
};
animation.SetAnimationListener(animationListener);
child.Animation = animation;
}
private async void OnRequestOnboardingPage(OnboardingViewModel oVm)
{
_viewModel = oVm;
AnimationInitUI();
BindEvents();
var mainAnimatorSet = new AnimatorSet();
var appNameLayoutFinalTopSpace = TypedValue.ApplyDimension(ComplexUnitType.Dip, 55.0f, Application.Context.Resources.DisplayMetrics);
var decelerateInterpolator = new DecelerateInterpolator(1.0f);
var appNameLayoutAnimator = new ValueAnimator();
appNameLayoutAnimator.SetDuration(750);
appNameLayoutAnimator.SetInterpolator(decelerateInterpolator);
appNameLayoutAnimator.SetFloatValues(_appNameLayout.GetY(), appNameLayoutFinalTopSpace);
appNameLayoutAnimator.Update += (o, args) => { _appNameLayout.SetY((float)args.Animation.AnimatedValue); };
var whatAccountsAnimator = new ValueAnimator();
whatAccountsAnimator.SetDuration(750);
whatAccountsAnimator.SetInterpolator(decelerateInterpolator);
whatAccountsAnimator.SetFloatValues(0.0f, 1.0f);
whatAccountsAnimator.Update += (o, args) => { _whatAccounts.Alpha = (float)args.Animation.AnimatedValue; };
var appNameAnimationSet = new AnimatorSet();
appNameAnimationSet.PlayTogether(appNameLayoutAnimator, whatAccountsAnimator);
var socialButtonsAnimatorSet = new AnimatorSet();
var overshootInterpolator = new OvershootInterpolator(3f);
var facebookButtonAnimator = new ValueAnimator();
facebookButtonAnimator.SetDuration(500);
facebookButtonAnimator.SetInterpolator(overshootInterpolator);
facebookButtonAnimator.SetFloatValues(_facebookButton.GetY() + _facebookButton.Height, _facebookButton.GetY());
facebookButtonAnimator.Update += (o, args) =>
{
_facebookButton.SetY((float)args.Animation.AnimatedValue);
_facebookButton.Alpha = args.Animation.AnimatedFraction;
};
var twitterButtonAnimator = new ValueAnimator();
twitterButtonAnimator.SetDuration(500);
twitterButtonAnimator.SetInterpolator(overshootInterpolator);
twitterButtonAnimator.SetFloatValues(_facebookButton.GetY() + _facebookButton.Height, _facebookButton.GetY());
twitterButtonAnimator.Update += (o, args) =>
{
_twitterButton.SetY((float)args.Animation.AnimatedValue);
_twitterButton.Alpha = args.Animation.AnimatedFraction;
};
socialButtonsAnimatorSet.PlaySequentially(facebookButtonAnimator, twitterButtonAnimator);
socialButtonsAnimatorSet.StartDelay = 500;
var letsGoButtonAnimator = new ValueAnimator();
letsGoButtonAnimator.SetDuration(500);
letsGoButtonAnimator.SetInterpolator(decelerateInterpolator);
letsGoButtonAnimator.SetFloatValues(0.0f, 1.0f);
letsGoButtonAnimator.Update += (sender, args) =>
{
_goButton.Alpha = (float)args.Animation.AnimatedValue;
};
mainAnimatorSet.PlaySequentially(appNameAnimationSet, socialButtonsAnimatorSet, letsGoButtonAnimator);
await _viewModel.DidLoad();
await Task.Delay(2000);
mainAnimatorSet.Start();
await _viewModel.DidAppear();
}