Inital commit

21 files changed, 779 insertions, 0 deletions

diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/IMarker.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/IMarker.cs
new file mode 100644
index 0000000..2595cdf
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/IMarker.cs
@@ -0,0 +1,31 @@
+namespace UnityEngine.Timeline
+{
+    /// <summary>
+    /// Interface implemented by markers.
+    /// </summary>
+    /// <remarks>
+    /// A marker is a point in time.
+    /// </remarks>
+    /// <seealso cref="UnityEngine.Timeline.Marker"/>
+    public interface IMarker
+    {
+        /// <summary>
+        /// The time set for the marker, in seconds.
+        /// </summary>
+        double time { get; set; }
+
+        /// <summary>
+        /// The track that contains the marker.
+        /// </summary>
+        TrackAsset parent { get; }
+
+        /// <summary>
+        /// This method is called when the marker is initialized.
+        /// </summary>
+        /// <param name="parent">The track that contains the marker.</param>
+        /// <remarks>
+        /// This method is called after each deserialization of the Timeline Asset.
+        /// </remarks>
+        void Initialize(TrackAsset parent);
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/IMarker.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/IMarker.cs.meta
new file mode 100644
index 0000000..3869cbc
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/IMarker.cs.meta
@@ -0,0 +1,11 @@
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/INotificationOptionProvider.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/INotificationOptionProvider.cs
new file mode 100644
index 0000000..7a23d7d
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/INotificationOptionProvider.cs
@@ -0,0 +1,15 @@
+namespace UnityEngine.Timeline
+{
+    /// <summary>
+    /// Implement this interface to change the behaviour of an INotification.
+    /// </summary>
+    /// This interface must be implemented along with <see cref="UnityEngine.Playables.INotification"/> to modify the default behaviour of a notification.
+    /// <seealso cref="UnityEngine.Timeline.NotificationFlags"/>
+    public interface INotificationOptionProvider
+    {
+        /// <summary>
+        /// The flags that change the triggering behaviour.
+        /// </summary>
+        NotificationFlags flags { get; }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/INotificationOptionProvider.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/INotificationOptionProvider.cs.meta
new file mode 100644
index 0000000..3e59b72
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/INotificationOptionProvider.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Marker.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Marker.cs
new file mode 100644
index 0000000..2f12cd7
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Marker.cs
@@ -0,0 +1,53 @@
+using System;
+
+namespace UnityEngine.Timeline
+{
+    /// <summary>
+    /// Use Marker as a base class when creating a custom marker.
+    /// </summary>
+    /// <remarks>
+    /// A marker is a point in time.
+    /// </remarks>
+    public abstract class Marker : ScriptableObject, IMarker
+    {
+        [SerializeField, TimeField, Tooltip("Time for the marker")] double m_Time;
+
+        /// <inheritdoc/>
+        public TrackAsset parent { get; private set; }
+
+        /// <inheritdoc/>
+        /// <remarks>
+        /// The marker time cannot be negative.
+        /// </remarks>
+        public double time
+        {
+            get { return m_Time; }
+            set { m_Time = Math.Max(value, 0); }
+        }
+
+        void IMarker.Initialize(TrackAsset parentTrack)
+        {
+            // We only really want to update the parent when the object is first deserialized
+            // If not a cloned track would "steal" the source's markers
+            if (parent == null)
+            {
+                parent = parentTrack;
+                try
+                {
+                    OnInitialize(parentTrack);
+                }
+                catch (Exception e)
+                {
+                    Debug.LogError(e.Message, this);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Override this method to receive a callback when the marker is initialized.
+        /// </summary>
+        public virtual void OnInitialize(TrackAsset aPent)
+        {
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Marker.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Marker.cs.meta
new file mode 100644
index 0000000..2bb36b5
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Marker.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerList.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerList.cs
new file mode 100644
index 0000000..4be4fc2
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerList.cs
@@ -0,0 +1,168 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine.Playables;
+
+namespace UnityEngine.Timeline
+{
+    [Serializable]
+    struct MarkerList : ISerializationCallbackReceiver
+    {
+        [SerializeField, HideInInspector] List<ScriptableObject> m_Objects;
+
+        [HideInInspector, NonSerialized] List<IMarker> m_Cache;
+        bool m_CacheDirty;
+        bool m_HasNotifications;
+        public List<IMarker> markers
+        {
+            get
+            {
+                BuildCache();
+                return m_Cache;
+            }
+        }
+
+        public MarkerList(int capacity)
+        {
+            m_Objects = new List<ScriptableObject>(capacity);
+            m_Cache = new List<IMarker>(capacity);
+            m_CacheDirty = true;
+            m_HasNotifications = false;
+        }
+
+        public void Add(ScriptableObject item)
+        {
+            if (item == null)
+                return;
+
+            m_Objects.Add(item);
+            m_CacheDirty = true;
+        }
+
+        public bool Remove(IMarker item)
+        {
+            if (!(item is ScriptableObject))
+                throw new InvalidOperationException("Supplied type must be a ScriptableObject");
+            return Remove((ScriptableObject)item, item.parent.timelineAsset, item.parent);
+        }
+
+        public bool Remove(ScriptableObject item, TimelineAsset timelineAsset, PlayableAsset thingToDirty)
+        {
+            if (!m_Objects.Contains(item)) return false;
+
+            TimelineUndo.PushUndo(thingToDirty, "Delete Marker");
+            m_Objects.Remove(item);
+            m_CacheDirty = true;
+            TimelineUndo.PushDestroyUndo(timelineAsset, thingToDirty, item, "Delete Marker");
+            return true;
+        }
+
+        public void Clear()
+        {
+            m_Objects.Clear();
+            m_CacheDirty = true;
+        }
+
+        public bool Contains(ScriptableObject item)
+        {
+            return m_Objects.Contains(item);
+        }
+
+        public IEnumerable<IMarker> GetMarkers()
+        {
+            return markers;
+        }
+
+        public int Count
+        {
+            get { return markers.Count; }
+        }
+
+        public IMarker this[int idx]
+        {
+            get
+            {
+                return markers[idx];
+            }
+        }
+
+        public List<ScriptableObject> GetRawMarkerList()
+        {
+            return m_Objects;
+        }
+
+        public IMarker CreateMarker(Type type, double time, TrackAsset owner)
+        {
+            if (!typeof(ScriptableObject).IsAssignableFrom(type) || !typeof(IMarker).IsAssignableFrom(type))
+            {
+                throw new InvalidOperationException(
+                    "The requested type needs to inherit from ScriptableObject and implement IMarker");
+            }
+            if (!owner.supportsNotifications && typeof(INotification).IsAssignableFrom(type))
+            {
+                throw new InvalidOperationException(
+                    "Markers implementing the INotification interface cannot be added on tracks that do not support notifications");
+            }
+
+            var markerSO = ScriptableObject.CreateInstance(type);
+            var marker = (IMarker)markerSO;
+            marker.time = time;
+
+            TimelineCreateUtilities.SaveAssetIntoObject(markerSO, owner);
+            TimelineUndo.RegisterCreatedObjectUndo(markerSO, "Create " + type.Name);
+            TimelineUndo.PushUndo(owner, "Create " + type.Name);
+
+            Add(markerSO);
+            marker.Initialize(owner);
+
+            return marker;
+        }
+
+        public bool HasNotifications()
+        {
+            BuildCache();
+            return m_HasNotifications;
+        }
+
+        void ISerializationCallbackReceiver.OnBeforeSerialize()
+        {
+        }
+
+        void ISerializationCallbackReceiver.OnAfterDeserialize()
+        {
+#if UNITY_EDITOR
+            for (int i = m_Objects.Count - 1; i >= 0; i--)
+            {
+                object o = m_Objects[i];
+                if (o == null)
+                {
+                    Debug.LogWarning("Empty marker found while loading timeline. It will be removed.");
+                    m_Objects.RemoveAt(i);
+                }
+            }
+#endif
+            m_CacheDirty = true;
+        }
+
+        void BuildCache()
+        {
+            if (m_CacheDirty)
+            {
+                m_Cache = new List<IMarker>(m_Objects.Count);
+                m_HasNotifications = false;
+                foreach (var o in m_Objects)
+                {
+                    if (o != null)
+                    {
+                        m_Cache.Add(o as IMarker);
+                        if (o is INotification)
+                        {
+                            m_HasNotifications = true;
+                        }
+                    }
+                }
+
+                m_CacheDirty = false;
+            }
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerList.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerList.cs.meta
new file mode 100644
index 0000000..1875712
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerList.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerTrack.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerTrack.cs
new file mode 100644
index 0000000..f64b483
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerTrack.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine.Playables;
+
+namespace UnityEngine.Timeline
+{
+    /// <inheritdoc />
+    /// <summary>
+    /// Use this track to add Markers bound to a GameObject.
+    /// </summary>
+    [Serializable]
+    [TrackBindingType(typeof(GameObject))]
+    [HideInMenu]
+    [ExcludeFromPreset]
+    public class MarkerTrack : TrackAsset
+    {
+        /// <inheritdoc/>
+        public override IEnumerable<PlayableBinding> outputs
+        {
+            get
+            {
+                return this == timelineAsset.markerTrack ?
+                    new List<PlayableBinding> {ScriptPlayableBinding.Create(name, null, typeof(GameObject))} :
+                    base.outputs;
+            }
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerTrack.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerTrack.cs.meta
new file mode 100644
index 0000000..37ca389
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/MarkerTrack.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/SignalTrack.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/SignalTrack.cs
new file mode 100644
index 0000000..7c7bc4e
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/SignalTrack.cs
@@ -0,0 +1,19 @@
+using System;
+
+namespace UnityEngine.Timeline
+{
+    /// <summary>
+    /// Use this track to emit signals to a bound SignalReceiver.
+    /// </summary>
+    /// <remarks>
+    /// This track cannot contain clips.
+    /// </remarks>
+    /// <seealso cref="UnityEngine.Timeline.SignalEmitter"/>
+    /// <seealso cref="UnityEngine.Timeline.SignalReceiver"/>
+    /// <seealso cref="UnityEngine.Timeline.SignalAsset"/>
+    [Serializable]
+    [TrackBindingType(typeof(SignalReceiver))]
+    [TrackColor(0.25f, 0.25f, 0.25f)]
+    [ExcludeFromPreset]
+    public class SignalTrack : MarkerTrack {}
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/SignalTrack.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/SignalTrack.cs.meta
new file mode 100644
index 0000000..3343f84
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/SignalTrack.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals.meta
new file mode 100644
index 0000000..aa956e4
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals.meta
@@ -0,0 +1,8 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/CustomSignalEventDrawer.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/CustomSignalEventDrawer.cs
new file mode 100644
index 0000000..49df674
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/CustomSignalEventDrawer.cs
@@ -0,0 +1,5 @@
+namespace UnityEngine.Timeline
+{
+    //used to tell Signal Handler inspector to use a special drawer for UnityEvent
+    class CustomSignalEventDrawer : PropertyAttribute {}
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/CustomSignalEventDrawer.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/CustomSignalEventDrawer.cs.meta
new file mode 100644
index 0000000..c7c813f
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/CustomSignalEventDrawer.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalAsset.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalAsset.cs
new file mode 100644
index 0000000..d605588
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalAsset.cs
@@ -0,0 +1,22 @@
+using System;
+using UnityEngine;
+
+namespace UnityEngine.Timeline
+{
+    /// <summary>
+    /// An asset representing an emitted signal. A SignalAsset connects a SignalEmitter with a SignalReceiver.
+    /// </summary>
+    /// <seealso cref="UnityEngine.Timeline.SignalEmitter"/>
+    /// <seealso cref="UnityEngine.Timeline.SignalReceiver"/>
+    [AssetFileNameExtension("signal")]
+    public class SignalAsset : ScriptableObject
+    {
+        internal static event Action<SignalAsset> OnEnableCallback;
+
+        void OnEnable()
+        {
+            if (OnEnableCallback != null)
+                OnEnableCallback(this);
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalAsset.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalAsset.cs.meta
new file mode 100644
index 0000000..437f4d3
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalAsset.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalEmitter.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalEmitter.cs
new file mode 100644
index 0000000..d4d4ca9
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalEmitter.cs
@@ -0,0 +1,72 @@
+using System;
+using UnityEngine;
+using UnityEngine.Playables;
+
+namespace UnityEngine.Timeline
+{
+    /// <inheritdoc cref="UnityEngine.Timeline.IMarker" />
+    /// <summary>
+    /// Marker that emits a signal to a SignalReceiver.
+    /// </summary>
+    /// A SignalEmitter emits a notification through the playable system. A SignalEmitter is used with a SignalReceiver and a SignalAsset.
+    /// <seealso cref="UnityEngine.Timeline.SignalAsset"/>
+    /// <seealso cref="UnityEngine.Timeline.SignalReceiver"/>
+    [Serializable]
+    [CustomStyle("SignalEmitter")]
+    [ExcludeFromPreset]
+    public class SignalEmitter : Marker, INotification, INotificationOptionProvider
+    {
+        [SerializeField] bool m_Retroactive;
+        [SerializeField] bool m_EmitOnce;
+        [SerializeField] SignalAsset m_Asset;
+
+        /// <summary>
+        /// Use retroactive to emit the signal if playback starts after the SignalEmitter time.
+        /// </summary>
+        public bool retroactive
+        {
+            get { return m_Retroactive; }
+            set { m_Retroactive = value; }
+        }
+
+        /// <summary>
+        /// Use emitOnce to emit this signal once during loops.
+        /// </summary>
+        public bool emitOnce
+        {
+            get { return m_EmitOnce; }
+            set { m_EmitOnce = value; }
+        }
+
+        /// <summary>
+        /// Asset representing the signal being emitted.
+        /// </summary>
+        public SignalAsset asset
+        {
+            get { return m_Asset; }
+            set { m_Asset = value; }
+        }
+
+        PropertyName INotification.id
+        {
+            get
+            {
+                if (m_Asset != null)
+                {
+                    return new PropertyName(m_Asset.name);
+                }
+                return new PropertyName(string.Empty);
+            }
+        }
+
+        NotificationFlags INotificationOptionProvider.flags
+        {
+            get
+            {
+                return (retroactive ? NotificationFlags.Retroactive : default(NotificationFlags)) |
+                    (emitOnce ? NotificationFlags.TriggerOnce : default(NotificationFlags)) |
+                    NotificationFlags.TriggerInEditMode;
+            }
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalEmitter.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalEmitter.cs.meta
new file mode 100644
index 0000000..f14c8a3
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalEmitter.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalReceiver.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalReceiver.cs
new file mode 100644
index 0000000..4e7564a
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalReceiver.cs
@@ -0,0 +1,248 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Events;
+using UnityEngine.Playables;
+
+namespace UnityEngine.Timeline
+{
+    /// <summary>
+    /// Listens for emitted signals and reacts depending on its defined reactions.
+    /// </summary>
+    /// A SignalReceiver contains a list of reactions. Each reaction is bound to a SignalAsset.
+    /// When a SignalEmitter emits a signal, the SignalReceiver invokes the corresponding reaction.
+    /// <seealso cref="UnityEngine.Timeline.SignalEmitter"/>
+    /// <seealso cref="UnityEngine.Timeline.SignalAsset"/>
+    public class SignalReceiver : MonoBehaviour, INotificationReceiver
+    {
+        [SerializeField]
+        EventKeyValue m_Events = new EventKeyValue();
+
+        /// <summary>
+        /// Called when a notification is sent.
+        /// </summary>
+        public void OnNotify(Playable origin, INotification notification, object context)
+        {
+            var signal = notification as SignalEmitter;
+            if (signal != null && signal.asset != null)
+            {
+                UnityEvent evt;
+                if (m_Events.TryGetValue(signal.asset, out evt) && evt != null)
+                {
+                    evt.Invoke();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Defines a new reaction for a SignalAsset.
+        /// </summary>
+        /// <param name="asset">The SignalAsset for which the reaction is being defined.</param>
+        /// <param name="reaction">The UnityEvent that describes the reaction.</param>
+        /// <exception cref="ArgumentNullException">Thrown when the asset is null.</exception>
+        /// <exception cref="ArgumentException">Thrown when the SignalAsset is already registered with this receiver.</exception>
+        public void AddReaction(SignalAsset asset, UnityEvent reaction)
+        {
+            if (asset == null)
+                throw new ArgumentNullException("asset");
+
+            if (m_Events.signals.Contains(asset))
+                throw new ArgumentException("SignalAsset already used.");
+            m_Events.Append(asset, reaction);
+        }
+
+        /// <summary>
+        /// Appends a null SignalAsset with a reaction specified by the UnityEvent.
+        /// </summary>
+        /// <param name="reaction">The new reaction to be appended.</param>
+        /// <returns>The index of the appended reaction.</returns>
+        /// <remarks>Multiple null assets are valid.</remarks>
+        public int AddEmptyReaction(UnityEvent reaction)
+        {
+            m_Events.Append(null, reaction);
+            return m_Events.events.Count - 1;
+        }
+
+        /// <summary>
+        /// Removes the first occurrence of a SignalAsset.
+        /// </summary>
+        /// <param name="asset">The SignalAsset to be removed.</param>
+        public void Remove(SignalAsset asset)
+        {
+            if (!m_Events.signals.Contains(asset))
+            {
+                throw new ArgumentException("The SignalAsset is not registered with this receiver.");
+            }
+
+            m_Events.Remove(asset);
+        }
+
+        /// <summary>
+        /// Gets a list of all registered SignalAssets.
+        /// </summary>
+        /// <returns>Returns a list of SignalAssets.</returns>
+        public IEnumerable<SignalAsset> GetRegisteredSignals()
+        {
+            return m_Events.signals;
+        }
+
+        /// <summary>
+        /// Gets the first UnityEvent associated with a SignalAsset.
+        /// </summary>
+        /// <param name="key">A SignalAsset defining the signal.</param>
+        /// <returns>Returns the reaction associated with a SignalAsset. Returns null if the signal asset does not exist.</returns>
+        public UnityEvent GetReaction(SignalAsset key)
+        {
+            UnityEvent ret;
+            if (m_Events.TryGetValue(key, out ret))
+            {
+                return ret;
+            }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Returns the count of registered SignalAssets.
+        /// </summary>
+        /// <returns></returns>
+        public int Count()
+        {
+            return m_Events.signals.Count;
+        }
+
+        /// <summary>
+        /// Replaces the SignalAsset associated with a reaction at a specific index.
+        /// </summary>
+        /// <param name="idx">The index of the reaction.</param>
+        /// <param name="newKey">The replacement SignalAsset.</param>
+        /// <exception cref="ArgumentException">Thrown when the replacement SignalAsset is already registered to this SignalReceiver.</exception>
+        /// <remarks>The new SignalAsset can be null.</remarks>
+        public void ChangeSignalAtIndex(int idx, SignalAsset newKey)
+        {
+            if (idx < 0 || idx > m_Events.signals.Count - 1)
+                throw new IndexOutOfRangeException();
+
+            if (m_Events.signals[idx] == newKey)
+                return;
+            var alreadyUsed = m_Events.signals.Contains(newKey);
+            if (newKey == null || m_Events.signals[idx]  == null || !alreadyUsed)
+                m_Events.signals[idx] = newKey;
+
+            if (newKey != null && alreadyUsed)
+                throw new ArgumentException("SignalAsset already used.");
+        }
+
+        /// <summary>
+        /// Removes the SignalAsset and reaction at a specific index.
+        /// </summary>
+        /// <param name="idx">The index of the SignalAsset to be removed.</param>
+        public void RemoveAtIndex(int idx)
+        {
+            if (idx < 0 || idx > m_Events.signals.Count - 1)
+                throw new IndexOutOfRangeException();
+            m_Events.Remove(idx);
+        }
+
+        /// <summary>
+        /// Replaces the reaction at a specific index with a new UnityEvent.
+        /// </summary>
+        /// <param name="idx">The index of the reaction to be replaced.</param>
+        /// <param name="reaction">The replacement reaction.</param>
+        /// <exception cref="ArgumentNullException">Thrown when the replacement reaction is null.</exception>
+        public void ChangeReactionAtIndex(int idx, UnityEvent reaction)
+        {
+            if (idx < 0 || idx > m_Events.events.Count - 1)
+                throw new IndexOutOfRangeException();
+
+            m_Events.events[idx] = reaction;
+        }
+
+        /// <summary>
+        /// Gets the reaction at a specific index.
+        /// </summary>
+        /// <param name="idx">The index of the reaction.</param>
+        /// <returns>Returns a reaction.</returns>
+        public UnityEvent GetReactionAtIndex(int idx)
+        {
+            if (idx < 0 || idx > m_Events.events.Count - 1)
+                throw new IndexOutOfRangeException();
+            return m_Events.events[idx];
+        }
+
+        /// <summary>
+        /// Gets the SignalAsset at a specific index
+        /// </summary>
+        /// <param name="idx">The index of the SignalAsset.</param>
+        /// <returns>Returns a SignalAsset.</returns>
+        public SignalAsset GetSignalAssetAtIndex(int idx)
+        {
+            if (idx < 0 || idx > m_Events.signals.Count - 1)
+                throw new IndexOutOfRangeException();
+            return m_Events.signals[idx];
+        }
+
+        // Required by Unity for the MonoBehaviour to have an enabled state
+        private void OnEnable()
+        {
+        }
+
+        [Serializable]
+        class EventKeyValue
+        {
+            [SerializeField]
+            List<SignalAsset> m_Signals = new List<SignalAsset>();
+
+            [SerializeField, CustomSignalEventDrawer]
+            List<UnityEvent> m_Events = new List<UnityEvent>();
+
+            public bool TryGetValue(SignalAsset key, out UnityEvent value)
+            {
+                var index = m_Signals.IndexOf(key);
+                if (index != -1)
+                {
+                    value = m_Events[index];
+                    return true;
+                }
+
+                value = null;
+                return false;
+            }
+
+            public void Append(SignalAsset key, UnityEvent value)
+            {
+                m_Signals.Add(key);
+                m_Events.Add(value);
+            }
+
+            public void Remove(int idx)
+            {
+                if (idx != -1)
+                {
+                    m_Signals.RemoveAt(idx);
+                    m_Events.RemoveAt(idx);
+                }
+            }
+
+            public void Remove(SignalAsset key)
+            {
+                var idx = m_Signals.IndexOf(key);
+                if (idx != -1)
+                {
+                    m_Signals.RemoveAt(idx);
+                    m_Events.RemoveAt(idx);
+                }
+            }
+
+            public List<SignalAsset> signals
+            {
+                get { return m_Signals; }
+            }
+
+            public List<UnityEvent> events
+            {
+                get { return m_Events; }
+            }
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalReceiver.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalReceiver.cs.meta
new file mode 100644
index 0000000..8d08ff6
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Runtime/Events/Signals/SignalReceiver.cs.meta
@@ -0,0 +1,11 @@
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+  serializedVersion: 2
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