import 'dart:ui';

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    debugShowCheckedModeBanner: false,
    home: Scaffold(
      body: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            color: Colors.amber,
            child: SizedBox(
              child: CustomPaint(
                painter: ArrowPainter(),
              ),
              width: 24,
              height: 24,
            ),
          ),
          Text(
            "Hello",
            style: TextStyle(fontSize: 36),
          ),
        ],
      ),
    ),
  ));
}

class ClippingPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final recorder = PictureRecorder();
    final c = Canvas(recorder);
    c.clipRect(Offset.zero & size);
    final picture = recorder.endRecording();
    canvas.drawPicture(picture);
  }

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