luojigou_battle/packages/widget/lib/src/battle_background.dart

import 'package:flutter/widgets.dart';

import 'constant.dart';

class BattleBackground extends StatelessWidget {
  const BattleBackground({super.key});

  @override
  Widget build(BuildContext context) {
    return CustomPaint(
      painter: _BattleBackgroundPainter(),
      child: const SizedBox.expand(),
    );
  }
}

class _BattleBackgroundPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = kBoardBackgroundColor
      ..style = PaintingStyle.fill;

    canvas.drawRRect(_getBoardRRect(size), paint);
  }

  RRect _getBoardRRect(Size size) {
    return RRect.fromRectAndRadius(Offset.zero & size, const Radius.circular(8));
  }

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