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osu-lazer/osu.Game/Audio/PreviewTrack.cs

105 lines
2.6 KiB
C#

// 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 System;
using osu.Framework.Allocation;
using osu.Framework.Audio.Track;
using osu.Framework.Graphics;
using osu.Framework.Threading;
namespace osu.Game.Audio
{
public abstract class PreviewTrack : Component
{
/// <summary>
/// Invoked when this <see cref="PreviewTrack"/> has stopped playing.
/// </summary>
public event Action Stopped;
/// <summary>
/// Invoked when this <see cref="PreviewTrack"/> has started playing.
/// </summary>
public event Action Started;
private Track track;
private bool hasStarted;
[BackgroundDependencyLoader]
private void load()
{
track = GetTrack();
if (track != null)
track.Completed += () => Schedule(Stop);
}
/// <summary>
/// Length of the track.
/// </summary>
public double Length => track?.Length ?? 0;
/// <summary>
/// The current track time.
/// </summary>
public double CurrentTime => track?.CurrentTime ?? 0;
/// <summary>
/// Whether the track is loaded.
/// </summary>
public bool TrackLoaded => track?.IsLoaded ?? false;
/// <summary>
/// Whether the track is playing.
/// </summary>
public bool IsRunning => track?.IsRunning ?? false;
private ScheduledDelegate startDelegate;
/// <summary>
/// Starts playing this <see cref="PreviewTrack"/>.
/// </summary>
/// <returns>Whether the track is started or already playing.</returns>
public bool Start()
{
if (track == null)
return false;
startDelegate = Schedule(() =>
{
if (hasStarted)
return;
hasStarted = true;
track.Restart();
Started?.Invoke();
});
return true;
}
/// <summary>
/// Stops playing this <see cref="PreviewTrack"/>.
/// </summary>
public void Stop()
{
startDelegate?.Cancel();
if (track == null)
return;
if (!hasStarted)
return;
hasStarted = false;
track.Stop();
Stopped?.Invoke();
}
/// <summary>
/// Retrieves the audio track.
/// </summary>
protected abstract Track GetTrack();
}
}