nested_scroll_view.1.dart 1.66 KB
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// 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';

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/// Flutter code sample for [NestedScrollView].
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void main() => runApp(const NestedScrollViewExampleApp());
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class NestedScrollViewExampleApp extends StatelessWidget {
  const NestedScrollViewExampleApp({super.key});
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  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
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      home: NestedScrollViewExample(),
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    );
  }
}

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class NestedScrollViewExample extends StatelessWidget {
  const NestedScrollViewExample({super.key});
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  @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,
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            headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
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              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')),
                  );
                })));
  }
}