Flutter TextField上仅左上角的边框

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('TextField with Left Top Border')),
        body: Center(
          child: LeftTopBorderTextField(),
        ),
      ),
    );
  }
}

class LeftTopBorderTextField extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        border: Border(
          top: BorderSide(width: 1.0, color: Colors.black),
          left: BorderSide(width: 1.0, color: Colors.black),
        ),
      ),
      child: TextField(
        decoration: InputDecoration(
          border: InputBorder.none, // 移除TextField默认的边框
          hintText: 'Enter text here',
        ),
      ),
    );
  }
}