import 'package:flutter/material.dart'; class TransparencyPainter extends CustomPainter { @override void paint(Canvas canvas, Size size) { canvas.drawRect( Rect.fromLTWH(0, 0, size.width, size.height), Paint() ..blendMode = BlendMode.clear ..color = const Color(0x00000000), ); } @override bool shouldRepaint(covariant CustomPainter oldDelegate) => false; }