Track containers 3: list view with children changing content size

main.dart

// List view, first and third changee height of their content.
import 'dart:math';
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;
  MyHomePage({Key? key, required this.title}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  ScrollController _scrollController = ScrollController();

  double _scale(double value, double inLow, double inHigh, double outLow,
      double outHigh) {
    return (((value - inLow) / (inHigh - inLow)) * (outHigh - outLow) + outLow)
        .clamp(min(outLow, outHigh), max(outLow, outHigh));
  }

  Widget _buildContainer(Color color, Color borderColor, double height) =>
      Container(
          height: height,
    width:1000,
          decoration: BoxDecoration(
              color: color, border: Border.all(color: borderColor, width: 8)),
          child: Column(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                RaisedButton(onPressed: () {}, child: Text('foo')),
                RaisedButton(onPressed: () {}, child: Text('foo')),
                RaisedButton(onPressed: () {}, child: Text('foo')),
              ]));

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Column(children: [
          Container(
              color: Color(0x88888888),
              height: 600,
              child: ListView(controller: _scrollController, children: [
                Container(
                    height: 600,
                    child: Align(
                        alignment: Alignment.bottomCenter,
                        child: AnimatedBuilder(
                            animation: _scrollController,
                            builder: (_, __) => _buildContainer(
                                Color(0x88FF0000),
                                Color(0xFFFF0000),
                                _scale(_scrollController.offset, 0, 450, 600,
                                    150))))),
                _buildContainer(Color(0x8800FF00), Color(0xFF00FF00), 300),
                 Container(
                    height: 600,
                    child: Align(
                        alignment: Alignment.topCenter,
                        child: AnimatedBuilder(
                            animation: _scrollController,
                            builder: (_, __) => _buildContainer(
                                Color(0x880000FF),
                                Color(0xFF0000FF),
                                _scale(_scrollController.offset, 450, 900, 150,
                                    600))))),
              ])),
        ]));
  }
}