我可以在CustomPaint中使用画布在Flutter中绘制自定义方框阴影吗？

import 'package:flutter/material.dart';

class CustomBoxShadowPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final rect = Rect.fromLTWH(0, 0, size.width, size.height);
    final paint = Paint()
      ..color = Colors.white
      ..style = PaintingStyle.fill
      ..maskFilter = MaskFilter.blur(BlurStyle.normal, 10);

    canvas.drawRect(rect, paint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return false;
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CustomPaint(
      painter: CustomBoxShadowPainter(),
      child: Container(
        width: 200,
        height: 200,
      ),
    );
  }
}