osu-lazer/osu.Game/Graphics/Containers/OsuHoverContainer.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 OpenTK.Graphics;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Input;

namespace osu.Game.Graphics.Containers
{
    public class OsuHoverContainer : OsuClickableContainer
    {
        private Color4 hoverColour;
        private Color4 unhoverColour;

        protected override bool OnHover(InputState state)
        {
            this.FadeColour(hoverColour, 500, Easing.OutQuint);
            return base.OnHover(state);
        }

        protected override void OnHoverLost(InputState state)
        {
            this.FadeColour(unhoverColour, 500, Easing.OutQuint);
            base.OnHoverLost(state);
        }

        [BackgroundDependencyLoader]
        private void load(OsuColour colours)
        {
            hoverColour = colours.Yellow;
            unhoverColour = Colour;
        }
    }
}