freezer/lib/page_routes/scale_fade.dart

import 'package:flutter/widgets.dart';
import 'package:freezer/page_routes/basic_page_route.dart';

class ScaleFadePageRoute<T> extends BasicPageRoute<T> {
  final WidgetBuilder builder;
  final Curve animationCurve;
  final tween = Tween<double>(begin: 0.975, end: 1.0);

  ScaleFadePageRoute({
    required this.builder,
    this.animationCurve = Curves.linearToEaseOut,
    super.transitionDuration,
    super.maintainState,
    super.settings,
  });

  @override
  Widget buildPage(BuildContext context, Animation<double> animation,
          Animation<double> secondaryAnimation) =>
      builder(context);

  @override
  Widget buildTransitions(BuildContext context, Animation<double> animation,
      Animation<double> secondaryAnimation, Widget child) {
    final a = tween
        .animate(CurvedAnimation(parent: animation, curve: animationCurve));
    return ScaleTransition(scale: a, child: child);
  }
}