// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';

/// Flutter code sample for [NestedScrollView].

void main() => runApp(const NestedScrollViewExampleApp());

class NestedScrollViewExampleApp extends StatelessWidget {
  const NestedScrollViewExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: NestedScrollViewExample(),
    );
  }
}

class NestedScrollViewExample extends StatelessWidget {
  const NestedScrollViewExample({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: NestedScrollView(
            // Setting floatHeaderSlivers to true is required in order to float
            // the outer slivers over the inner scrollable.
            floatHeaderSlivers: true,
            headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
              return <Widget>[
                SliverAppBar(
                  title: const Text('Floating Nested SliverAppBar'),
                  floating: true,
                  expandedHeight: 200.0,
                  forceElevated: innerBoxIsScrolled,
                ),
              ];
            },
            body: ListView.builder(
                padding: const EdgeInsets.all(8),
                itemCount: 30,
                itemBuilder: (BuildContext context, int index) {
                  return SizedBox(
                    height: 50,
                    child: Center(child: Text('Item $index')),
                  );
                })));
  }
}