osu-lazer/osu.Game/Screens/Edit/Editor.cs

// Copyright (c) 2007-2017 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.Screens;
using osu.Game.Beatmaps;
using osu.Game.Screens.Backgrounds;

namespace osu.Game.Screens.Edit
{
    internal class Editor : ScreenWhiteBox
    {
        private WorkingBeatmap beatmap;
        public Editor(WorkingBeatmap workingBeatmap)
        {
            beatmap = workingBeatmap;
        }

        protected override BackgroundScreen CreateBackground() => new BackgroundScreenCustom(@"Backgrounds/bg4");

        protected override void OnEntering(Screen last)
        {
            base.OnEntering(last);
            Background.Schedule(() => Background.FadeColour(Color4.DarkGray, 500));
            beatmap.Track?.Stop();
        }

        protected override bool OnExiting(Screen next)
        {
            Background.Schedule(() => Background.FadeColour(Color4.White, 500));
            beatmap.Track?.Start();
            return base.OnExiting(next);
        }
    }
}