osu-lazer/osu.Game/Graphics/UserInterface/OsuEnumDropdown.cs

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using System;

namespace osu.Game.Graphics.UserInterface
{
    public class OsuEnumDropdown<T> : OsuDropdown<T>
    {
        public OsuEnumDropdown()
        {
            if (!typeof(T).IsEnum)
                throw new InvalidOperationException("OsuEnumDropdown only supports enums as the generic type argument");

            Items = (T[])Enum.GetValues(typeof(T));
        }
    }
}