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108 lines
2.7 KiB
C#
108 lines
2.7 KiB
C#
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
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// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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using System;
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using osu.Framework.Allocation;
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using osu.Framework.Audio.Track;
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using osu.Framework.Graphics;
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using osu.Framework.Threading;
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namespace osu.Game.Audio
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{
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public abstract class PreviewTrack : Component
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{
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/// <summary>
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/// Invoked when this <see cref="PreviewTrack"/> has stopped playing.
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/// </summary>
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public event Action Stopped;
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/// <summary>
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/// Invoked when this <see cref="PreviewTrack"/> has started playing.
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/// </summary>
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public event Action Started;
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private Track track;
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private bool wasPlaying;
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[BackgroundDependencyLoader]
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private void load()
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{
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track = GetTrack();
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if (track != null)
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track.Looping = false;
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}
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/// <summary>
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/// Length of the track.
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/// </summary>
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public double Length => track?.Length ?? 0;
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/// <summary>
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/// The current track time.
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/// </summary>
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public double CurrentTime => track?.CurrentTime ?? 0;
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/// <summary>
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/// Whether the track is loaded.
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/// </summary>
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public bool TrackLoaded => track?.IsLoaded ?? false;
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protected override void Update()
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{
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base.Update();
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// Todo: Track currently doesn't signal its completion, so we have to handle it manually
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if (track != null && wasPlaying && track.HasCompleted)
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Stop();
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}
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private ScheduledDelegate startDelegate;
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/// <summary>
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/// Starts playing this <see cref="PreviewTrack"/>.
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/// </summary>
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public void Start() => startDelegate = Schedule(() =>
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{
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if (!IsLoaded)
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return;
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if (track == null)
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return;
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if (wasPlaying)
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return;
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wasPlaying = true;
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track.Restart();
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Started?.Invoke();
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});
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/// <summary>
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/// Stops playing this <see cref="PreviewTrack"/>.
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/// </summary>
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public void Stop()
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{
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startDelegate?.Cancel();
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if (!IsLoaded)
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return;
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if (track == null)
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return;
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if (!wasPlaying)
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return;
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wasPlaying = false;
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track.Stop();
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Stopped?.Invoke();
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}
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/// <summary>
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/// Retrieves the audio track.
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/// </summary>
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protected abstract Track GetTrack();
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}
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}
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