RoundedRectangleProgress

class RoundedRectangleProgress extends CustomPainter {
  final double currentProgress;
  final BorderRadius borderRadius;
  final Color color;

  RoundedRectangleProgress({
    this.color = Colors.blue,
    this.borderRadius = BorderRadius.zero,
    this.currentProgress = 0,
  });

  @override
  void paint(Canvas canvas, Size size) {
    final rect = Offset.zero & size;
    //1
    final shapeBounds = Rect.fromLTRB(0, 0, size.width, size.height);
    //2
    final paint = Paint()
      ..strokeWidth = 10
      ..color = currentProgress > 288 ? Colors.redAccent : color
      ..style = PaintingStyle.stroke
      ..strokeCap = StrokeCap.square
      ..shader = SweepGradient(
        colors: [
          if (currentProgress > 288) Colors.redAccent else color,
          Colors.white,
        ],
        stops: const [1.0, 1.0],
        startAngle: 0,
        endAngle: vector.radians(currentProgress),
        transform: GradientRotation(vector.radians(-90)),
      ).createShader(rect);
    //3
    //canvas.drawRect(shapeBounds, paint);
    final borderRect =
        borderRadius.resolve(TextDirection.ltr).toRRect(shapeBounds);
    canvas.drawRRect(borderRect, paint);
  }

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