Header-Body-Footer2.dart

import 'package:flutter/material.dart';

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomScrollView(
        slivers: [
          SliverAppBar(
              expandedHeight: 100.0,
              floating: true,
              pinned: false,
              snap: false,
              flexibleSpace: const FlexibleSpaceBar(
                title: Text('Available seats'),
              ),
              actions: <Widget>[
                IconButton(
                  icon: const Icon(Icons.add_circle),
                  tooltip: 'Add new entry',
                  onPressed: () {},
                ),
              ]),
          SliverList(
            delegate: SliverChildListDelegate(
              [
                // Container(
                //   width: double.infinity,
                //   height: 50,
                //   color: Colors.orangeAccent,
                //   child: Center(
                //     child: Text(
                //       'Header',
                //       style: TextStyle(color: Colors.white, letterSpacing: 4),
                //     ),
                //   ),
                // ),
                ListView.builder(
                  shrinkWrap: true,
                  itemCount: 100,
                  itemBuilder: (BuildContext context, int index) {
                    return ListTile(
                      title: Center(child: Text('$index')),
                    );
                  },
                ),
              ],
            ),
          ),
          SliverFillRemaining(
            hasScrollBody: false,
            child: Align(
              alignment: Alignment.bottomCenter,
              child: Container(
                width: double.infinity,
                height: 50,
                color: Colors.blueAccent,
                child: Center(
                  child: Text(
                    'Footer',
                    style: TextStyle(color: Colors.white, letterSpacing: 4),
                  ),
                ),
              ),
            ),
          )
        ],
      ),
    );
  }
}