debouce example

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MyWidget();
  }
}

class MyWidget extends StatefulWidget {
  State<MyWidget> createState() => MyState();
}

class MyState extends State<MyWidget> with TickerProviderStateMixin {
  AnimationController controller;
  Animation animation;

  void initState() {
    super.initState();
    controller =
        AnimationController(vsync: this, duration: Duration(seconds: 1))
          ..forward();
    animation = Tween(begin: 1.0, end: 0.0)
        .chain(CurveTween(curve: const Interval(0.5, 1.0)))
        .animate(controller.view);
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
        animation: animation,
        builder: (_, __) {
          print(animation.value);
          return Container();
        });
  }
}

Output:
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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1
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1
0.9992000000000001
0.965838
0.93249
0.899116
0.8657699999999999
0.832414
0.79905
0.7656799999999999
0.7323299999999999
0.698958
0.6656120000000001
0.63225
0.5988800000000001
0.5655300000000001
0.5321720000000001
0.49881
0.465468
0.4320759999999999
0.398722
0.3653599999999999
0.331998
0.298654
0.265312
0.23195199999999994
0.19856800000000008
0.1652260000000001
0.09851199999999993
0.03179200000000004
0