Sliver Scrolling Test

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(home: MyApp()));

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) => Scaffold(
    body: CustomScrollView(
      slivers: <Widget>[
        SliverPersistentHeader(
          delegate: _HeaderDelegate(),
          pinned: true,
        ),
        SliverList(
          delegate: SliverChildBuilderDelegate(
            (_, i) => Text(i.toString(), style: TextStyle(fontSize: 40),),
            childCount: 100,
          ),
 ),],),);
}



class _HeaderDelegate extends SliverPersistentHeaderDelegate {
  @override
  double  minExtent = 80;

  @override
  double maxExtent = 160;

  @override
  Widget build(BuildContext context,double shrinkOffset,bool overlapsContent,) => Container(color: Colors.pink,);
  
  @override
  bool shouldRebuild(_HeaderDelegate oldDelegate) => false;
}