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

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using JetBrains.Annotations;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Screens;
using osu.Framework.Threading;
using osu.Game.Beatmaps;
using osu.Game.Screens.Menu;

namespace osu.Game.Screens.Edit
{
    /// <summary>
    /// Transition screen for the editor.
    /// Used to avoid backing out to main menu/song select when switching difficulties from within the editor.
    /// </summary>
    public class EditorLoader : OsuScreen
    {
        public override float BackgroundParallaxAmount => 0.1f;

        public override bool AllowBackButton => false;

        public override bool HideOverlaysOnEnter => true;

        public override bool DisallowExternalBeatmapRulesetChanges => true;

        [Resolved]
        private BeatmapManager beatmapManager { get; set; }

        [CanBeNull]
        private ScheduledDelegate scheduledDifficultySwitch;

        protected override void LogoArriving(OsuLogo logo, bool resuming)
        {
            base.LogoArriving(logo, resuming);
            // the push cannot happen in OnEntering() or similar (even if scheduled), because the transition from main menu will look bad.
            // that is because this screen pushing the editor makes it no longer current, and OsuScreen checks if the screen is current
            // before enqueueing this screen's LogoArriving onto the logo animation sequence.
            logo.Delay(300).Schedule(pushEditor);
        }

        private void pushEditor()
        {
            this.Push(new Editor(this));
            ValidForResume = false;
        }

        public void ScheduleDifficultySwitch(BeatmapInfo beatmapInfo)
        {
            CancelDifficultySwitch();
            scheduledDifficultySwitch = Schedule(() =>
            {
                Beatmap.Value = beatmapManager.GetWorkingBeatmap(beatmapInfo);
                pushEditor();
            });
        }

        public void CancelDifficultySwitch() => scheduledDifficultySwitch?.Cancel();
    }
}