build method

  1. @override
Widget build(
  1. BuildContext context,
  2. Animation<double> primaryAnimation,
  3. Animation<double> secondaryAnimation,
  4. Widget child,
)

Implementation

@override
Widget build(BuildContext context, Animation<double> primaryAnimation,
    Animation<double> secondaryAnimation, Widget child) {
  var exitAnimation = secondaryAnimation as ProxyAnimation;

  double width = MediaQuery.of(context).size.width;

  if (!exitAnimation.isDismissed) {
    var animation = CurvedAnimation(parent: secondaryAnimation, curve: curve);

    return Transform(
      transform: Matrix4.identity()..translate(-width * animation.value),
      child: child,
    );
  } else {
    var animation = CurvedAnimation(parent: primaryAnimation, curve: curve);

    return ClipRect(
        clipper: ParallaxClipper(value: animation.value),
        child: Transform(
          transform: Matrix4.identity()
            ..translate(width * offset * (1.0 - animation.value)),
          child: child,
        ));
  }
}