Flutter优化组件性能

import 'package:flutter/material.dart';
void main() {
  runApp(MyApp());
}
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: MyHomePage(),
    );
  }
}
class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Demo'),
      ),
      body: ListView.builder(
        itemCount: 10000,
        itemBuilder: (context, index) {
          return OptimizedWidget(index: index);
        },
      ),
    );
  }
}
class OptimizedWidget extends StatelessWidget {
  final int index;
  const OptimizedWidget({Key? key, required this.index}) : super(key: key);
  @override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is OptimizedWidget && runtimeType == other.runtimeType && index == other.index;
  @override
  int get hashCode => index.hashCode;
  @override
  Widget build(BuildContext context) {
    return ListTile(
      leading: CircleAvatar(child: Text('$index')),
      title: Text('Item $index'),
      subtitle: Text('This is the subtitle of item $index'),
    );
  }
}