opacityForCard method

@override OpacityAnimation opacityForCard({ required int relativeIndex, })

Implementation

@override
OpacityAnimation opacityForCard({required int relativeIndex}) {
  return (progress) {
    if (relativeIndex == 0) {
      return progress.abs() < 0.5 ? 1.0 : 0.0;
    } else if (relativeIndex == 1) {
      return progress.abs() > 0.5 ? 1.0 : 0.0;
    }

    return 1;
  };
}