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osu-lazer/osu.Game/Audio/PreviewTrackManager.cs
2018-06-22 12:35:43 +09:00

108 lines
4.0 KiB
C#

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using osu.Framework.Allocation;
using osu.Framework.Audio;
using osu.Framework.Audio.Track;
using osu.Framework.Configuration;
using osu.Framework.Graphics;
using osu.Framework.IO.Stores;
using osu.Game.Beatmaps;
namespace osu.Game.Audio
{
/// <summary>
/// A central store for the retrieval of <see cref="PreviewTrack"/>s.
/// </summary>
public class PreviewTrackManager : Component
{
private readonly BindableDouble muteBindable = new BindableDouble();
private AudioManager audio;
private TrackManager trackManager;
private TrackManagerPreviewTrack current;
[BackgroundDependencyLoader]
private void load(AudioManager audio, FrameworkConfigManager config)
{
trackManager = new TrackManager(new OnlineStore());
this.audio = audio;
audio.AddItem(trackManager);
config.BindWith(FrameworkSetting.VolumeMusic, trackManager.Volume);
}
/// <summary>
/// Retrieves a <see cref="PreviewTrack"/> for a <see cref="BeatmapSetInfo"/>.
/// </summary>
/// <param name="beatmapSetInfo">The <see cref="BeatmapSetInfo"/> to retrieve the preview track for.</param>
/// <returns>The playable <see cref="PreviewTrack"/>.</returns>
public PreviewTrack Get(BeatmapSetInfo beatmapSetInfo)
{
var track = CreatePreviewTrack(beatmapSetInfo, trackManager);
track.Started += () =>
{
current?.Stop();
current = track;
audio.Track.AddAdjustment(AdjustableProperty.Volume, muteBindable);
};
track.Stopped += () =>
{
current = null;
audio.Track.RemoveAdjustment(AdjustableProperty.Volume, muteBindable);
};
return track;
}
/// <summary>
/// Stops any currently playing <see cref="PreviewTrack"/>.
/// </summary>
/// <remarks>
/// Only the immediate owner (an object that implements <see cref="IPreviewTrackOwner"/>) of the playing <see cref="PreviewTrack"/>
/// can globally stop the currently playing <see cref="PreviewTrack"/>. The object holding a reference to the <see cref="PreviewTrack"/>
/// can always stop the <see cref="PreviewTrack"/> themselves through <see cref="PreviewTrack.Stop()"/>.
/// </remarks>
/// <param name="source">The <see cref="IPreviewTrackOwner"/> which may be the owner of the <see cref="PreviewTrack"/>.</param>
public void StopAnyPlaying(IPreviewTrackOwner source)
{
if (current == null || current.Owner != source)
return;
current.Stop();
current = null;
}
/// <summary>
/// Creates the <see cref="TrackManagerPreviewTrack"/>.
/// </summary>
protected virtual TrackManagerPreviewTrack CreatePreviewTrack(BeatmapSetInfo beatmapSetInfo, TrackManager trackManager) => new TrackManagerPreviewTrack(beatmapSetInfo, trackManager);
protected class TrackManagerPreviewTrack : PreviewTrack
{
public IPreviewTrackOwner Owner { get; private set; }
private readonly BeatmapSetInfo beatmapSetInfo;
private readonly TrackManager trackManager;
public TrackManagerPreviewTrack(BeatmapSetInfo beatmapSetInfo, TrackManager trackManager)
{
this.beatmapSetInfo = beatmapSetInfo;
this.trackManager = trackManager;
}
[BackgroundDependencyLoader]
private void load(IPreviewTrackOwner owner)
{
Owner = owner;
}
protected override Track GetTrack() => trackManager.Get($"https://b.ppy.sh/preview/{beatmapSetInfo?.OnlineBeatmapSetID}.mp3");
}
}
}