如何在flutter中构建这种类型的搜索栏？

import 'package:flutter/material.dart';

class CustomSearchBar extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.symmetric(horizontal: 10),
      decoration: BoxDecoration(
        color: Colors.grey[200],
        borderRadius: BorderRadius.circular(10),
      ),
      child: Row(
        children: [
          Expanded(
            child: TextField(
              decoration: InputDecoration(
                hintText: '请输入搜索关键字',
                border: InputBorder.none,
              ),
            ),
          ),
          IconButton(
            icon: Icon(Icons.search),
            onPressed: () {
              // 处理搜索逻辑
            },
          ),
        ],
      ),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Search Bar'),
      ),
      body: Center(
        child: CustomSearchBar(),
      ),
    );
  }
}