如何在flutter中构建手绘边框或边框？

import 'package:flutter/material.dart';

class CustomBorderPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = Colors.black
      ..style = PaintingStyle.stroke
      ..strokeWidth = 2.0;

    final path = Path()
      ..moveTo(0, 0)
      ..lineTo(size.width, 0)
      ..lineTo(size.width, size.height)
      ..lineTo(0, size.height)
      ..close();

    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(CustomBorderPainter oldDelegate) => false;
}

class CustomBorderWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CustomPaint(
      painter: CustomBorderPainter(),
      child: Container(
        width: 200,
        height: 200,
        // 添加其他内容
      ),
    );
  }
}

// 在需要使用手绘边框的地方使用CustomBorderWidget