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osu-lazer/osu.Game/Screens/Edit/Compose/HitObjectUsageEventBuffer.cs

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// 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.
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#nullable disable
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using System;
using System.Collections.Generic;
using System.Linq;
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using JetBrains.Annotations;
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using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.UI;
namespace osu.Game.Screens.Edit.Compose
{
/// <summary>
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/// Buffers events from the many <see cref="HitObjectContainer"/>s in a nested <see cref="Playfield"/> hierarchy
/// to ensure correct ordering of events.
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/// </summary>
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internal class HitObjectUsageEventBuffer : IDisposable
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{
/// <summary>
/// Invoked when a <see cref="HitObject"/> becomes used by a <see cref="DrawableHitObject"/>.
/// </summary>
/// <remarks>
/// If the ruleset uses pooled objects, this represents the time when the <see cref="HitObject"/>s become alive.
/// </remarks>
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public event Action<HitObject> HitObjectUsageBegan;
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/// <summary>
/// Invoked when a <see cref="HitObject"/> becomes unused by a <see cref="DrawableHitObject"/>.
/// </summary>
/// <remarks>
/// If the ruleset uses pooled objects, this represents the time when the <see cref="HitObject"/>s become dead.
/// </remarks>
public event Action<HitObject> HitObjectUsageFinished;
/// <summary>
/// Invoked when a <see cref="HitObject"/> has been transferred to another <see cref="DrawableHitObject"/>.
/// </summary>
public event Action<HitObject, DrawableHitObject> HitObjectUsageTransferred;
private readonly Playfield playfield;
/// <summary>
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/// Creates a new <see cref="HitObjectUsageEventBuffer"/>.
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/// </summary>
/// <param name="playfield">The most top-level <see cref="Playfield"/>.</param>
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public HitObjectUsageEventBuffer([NotNull] Playfield playfield)
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{
this.playfield = playfield;
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playfield.HitObjectUsageBegan += onHitObjectUsageBegan;
playfield.HitObjectUsageFinished += onHitObjectUsageFinished;
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}
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private readonly List<HitObject> usageFinishedHitObjects = new List<HitObject>();
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private void onHitObjectUsageBegan(HitObject hitObject)
{
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if (usageFinishedHitObjects.Remove(hitObject))
HitObjectUsageTransferred?.Invoke(hitObject, playfield.AllHitObjects.Single(d => d.HitObject == hitObject));
else
HitObjectUsageBegan?.Invoke(hitObject);
}
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private void onHitObjectUsageFinished(HitObject hitObject) => usageFinishedHitObjects.Add(hitObject);
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public void Update()
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{
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foreach (var hitObject in usageFinishedHitObjects)
HitObjectUsageFinished?.Invoke(hitObject);
usageFinishedHitObjects.Clear();
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}
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public void Dispose()
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{
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if (playfield != null)
{
playfield.HitObjectUsageBegan -= onHitObjectUsageBegan;
playfield.HitObjectUsageFinished -= onHitObjectUsageFinished;
}
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}
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}
}