Folded card effect - Flutter

Question

I want to make an effect as shown below, I have added a Card and a Container in a Stack to show the upper badge. But I am not sure what or which widget to use for that upper left corner of the badge.

Can anyone guide me on how to achieve that effect.

My current state:

Answer 1

use a CustomPaint for the triangle part and composite with your text in a Row

class TrianglePainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    Paint paint = Paint()
      ..color = Colors.grey
      ..strokeWidth = 2.0;
    Path path = Path();
    path.moveTo(0.0, size.height);
    path.lineTo(size.width, 0.0);
    path.lineTo(size.width, size.height);
    canvas.drawPath(path, paint);
  }

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

and in your Row

Row(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: <Widget>[
           SizedBox(
             height: 8.0,
             width: 5.0,
             child: CustomPaint(
               painter: TrianglePainter(),
             ),
           ),
           Container(
             decoration: BoxDecoration(
                 color: Colors.red,
                 borderRadius: BorderRadius.only(
                     topRight: Radius.circular(6.0),
                     bottomLeft: Radius.circular(6.0))),
             width: 120.0,
             height: 30.0,
             child: Center(
               child: Text(
                 'Customer Replay',
                style: TextStyle(color: Colors.white),
               ),
             ),
           ),
         ],
        ),