From 64498e95a46915843625de96156c9e6ec6e0c0aa Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Mon, 8 May 2023 18:56:29 +0900
Subject: [PATCH] Add an `IAnimationTimeReference` to `DrawableHitObject` to
 synchronise all animations

---
 .../Rulesets/Objects/Drawables/DrawableHitObject.cs  | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs b/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs
index 79fc778287..07c0d1f8a1 100644
--- a/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs
+++ b/osu.Game/Rulesets/Objects/Drawables/DrawableHitObject.cs
@@ -30,7 +30,7 @@ using osuTK.Graphics;
 namespace osu.Game.Rulesets.Objects.Drawables
 {
     [Cached(typeof(DrawableHitObject))]
-    public abstract partial class DrawableHitObject : PoolableDrawableWithLifetime<HitObjectLifetimeEntry>
+    public abstract partial class DrawableHitObject : PoolableDrawableWithLifetime<HitObjectLifetimeEntry>, IAnimationTimeReference
     {
         /// <summary>
         /// Invoked after this <see cref="DrawableHitObject"/>'s applied <see cref="HitObject"/> has had its defaults applied.
@@ -425,11 +425,13 @@ namespace osu.Game.Rulesets.Objects.Drawables
 
             LifetimeEnd = double.MaxValue;
 
-            double transformTime = HitObject.StartTime - InitialLifetimeOffset;
-
             clearExistingStateTransforms();
 
-            using (BeginAbsoluteSequence(transformTime))
+            double initialTransformsTime = HitObject.StartTime - InitialLifetimeOffset;
+
+            AnimationStartTime.Value = initialTransformsTime;
+
+            using (BeginAbsoluteSequence(initialTransformsTime))
                 UpdateInitialTransforms();
 
             using (BeginAbsoluteSequence(StateUpdateTime))
@@ -721,6 +723,8 @@ namespace osu.Game.Rulesets.Objects.Drawables
             if (CurrentSkin != null)
                 CurrentSkin.SourceChanged -= skinSourceChanged;
         }
+
+        public Bindable<double> AnimationStartTime { get; } = new BindableDouble();
     }
 
     public abstract partial class DrawableHitObject<TObject> : DrawableHitObject