import 'package:flutter/material.dart';

class OverlayElevation {
  static const e1 = OverlayElevation._(0.05);
  static const e2 = OverlayElevation._(0.07);
  static const e3 = OverlayElevation._(0.08);
  static const e4 = OverlayElevation._(0.09);
  static const e6 = OverlayElevation._(0.11);

  static const values = [e1, e2, e3, e4, e6];

  const OverlayElevation._(this._opacity);

  final double _opacity;

  int get ordinal => values.indexOf(this);

  Color merge(Color fg, Color bg) {
    return Color.alphaBlend(fg.withOpacity(_opacity), bg);
  }
}

void foo() {
  blah(OverlayElevation.e4);
}

void blah(OverlayElevation e) {
  final color = e.merge(Colors.red, Colors.blue);
  print(color.value.toRadixString(16));
}