xenial-performance-6792

readme.md

xenial-performance-6792

Created with <3 with dartpad.dev.

main.dart

import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: darkBlue,
      ),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CustomScrollView(slivers: [
      SliverMainAxisGroup(
        slivers: [
          SliverToBoxAdapter(
            child: Padding(
              padding: const EdgeInsets.all(16.0),
              child: Text(
                'Hello, World!',
                style: TextStyle(fontSize: 12),
              ),
            ),
          ),
          SliverPersistentHeader(
            pinned: true,
            floating: false,
            delegate: HeaderDelegate(ListTile(
              tileColor: darkBlue,
                title: Text('Look at these numbers'),
              ),
            ),
          ),
          SliverList.builder(
              itemCount: 200,
              itemBuilder: (context, index) {
                return ListTile(title: Text(index.toString()));
              }),
          SliverToBoxAdapter(
            child: Divider(
              height: 2,
              thickness: 1,
              color: Colors.grey.shade300,
            ),
          ),
          SliverToBoxAdapter(
            child: Padding(
              padding:
                  const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8),
              child: Text('Hello Again!',
                  style: Theme.of(context).textTheme.bodySmall),
            ),
          ),
        ],
      )
    ]);
  }
}

class HeaderDelegate extends SliverPersistentHeaderDelegate {
  const HeaderDelegate(this.child);

  final Widget child;

  @override
  Widget build(
      BuildContext context, double shrinkOffset, bool overlapsContent) {
    return child;
  }

  @override
  double get maxExtent => minExtent;

  @override
  double get minExtent => 48;

  @override
  bool shouldRebuild(covariant SliverPersistentHeaderDelegate oldDelegate) =>
      false;
}