animation method

@override List<AnimationController> animation()

Method to init the animation controllers

Implementation

@override
List<AnimationController> animation() {
  var controllers = <AnimationController>[];

  var controller = AnimationController(
      duration: const Duration(milliseconds: 325), vsync: state);

  var translateTween = Tween(begin: 0, end: 0.5).animate(controller);
  var alphaTween = IntTween(begin: 255, end: 122).animate(controller);
  var rotateTween1 = Tween(begin: 0.0, end: 45.0).animate(controller);
  var rotateTween2 = Tween(begin: 0.0, end: -45.0).animate(controller);

  controller.addListener(() {
    translateX = translateTween.value.toDouble();
    alpha = alphaTween.value;
    degrees1 = rotateTween1.value;
    degrees2 = rotateTween2.value;
    postInvalidate();
  });

  controllers.add(controller);
  return controllers;
}