Inital commit

6 files changed, 812 insertions, 0 deletions

diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimatedParameterExtensions.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimatedParameterExtensions.cs
new file mode 100644
index 0000000..06f5e47
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimatedParameterExtensions.cs
@@ -0,0 +1,150 @@
+using System.Collections.Generic;
+using JetBrains.Annotations;
+using UnityEngine;
+using UnityEngine.Timeline;
+
+namespace UnityEditor.Timeline
+{
+    static class AnimatedParameterExtensions
+    {
+        public static bool HasAnyAnimatableParameters(this ICurvesOwner curvesOwner)
+        {
+            return AnimatedParameterUtility.HasAnyAnimatableParameters(curvesOwner.asset);
+        }
+
+        public static IEnumerable<SerializedProperty> GetAllAnimatableParameters(this ICurvesOwner curvesOwner)
+        {
+            return AnimatedParameterUtility.GetAllAnimatableParameters(curvesOwner.asset);
+        }
+
+        public static bool IsParameterAnimatable(this ICurvesOwner curvesOwner, string parameterName)
+        {
+            return AnimatedParameterUtility.IsParameterAnimatable(curvesOwner.asset, parameterName);
+        }
+
+        public static bool IsParameterAnimated(this ICurvesOwner curvesOwner, string parameterName)
+        {
+            return AnimatedParameterUtility.IsParameterAnimated(curvesOwner.asset, curvesOwner.curves, parameterName);
+        }
+
+        public static EditorCurveBinding GetCurveBinding(this ICurvesOwner curvesOwner, string parameterName)
+        {
+            return AnimatedParameterUtility.GetCurveBinding(curvesOwner.asset, parameterName);
+        }
+
+        public static string GetUniqueRecordedClipName(this ICurvesOwner curvesOwner)
+        {
+            return AnimationTrackRecorder.GetUniqueRecordedClipName(curvesOwner.assetOwner, curvesOwner.defaultCurvesName);
+        }
+
+        public static AnimationCurve GetAnimatedParameter(this ICurvesOwner curvesOwner, string bindingName)
+        {
+            return AnimatedParameterUtility.GetAnimatedParameter(curvesOwner.asset, curvesOwner.curves, bindingName);
+        }
+
+        public static bool AddAnimatedParameterValueAt(this ICurvesOwner curvesOwner, string parameterName, float value, float time)
+        {
+            if (!curvesOwner.IsParameterAnimatable(parameterName))
+                return false;
+
+            if (curvesOwner.curves == null)
+                curvesOwner.CreateCurves(curvesOwner.GetUniqueRecordedClipName());
+
+            var binding = curvesOwner.GetCurveBinding(parameterName);
+            var curve = AnimationUtility.GetEditorCurve(curvesOwner.curves, binding) ?? new AnimationCurve();
+
+            var serializedObject = AnimatedParameterUtility.GetSerializedPlayableAsset(curvesOwner.asset);
+            var property = serializedObject.FindProperty(parameterName);
+
+            bool isStepped = property.propertyType == SerializedPropertyType.Boolean ||
+                property.propertyType == SerializedPropertyType.Integer ||
+                property.propertyType == SerializedPropertyType.Enum;
+
+            CurveEditUtility.AddKeyFrameToCurve(curve, time, curvesOwner.curves.frameRate, value, isStepped);
+            AnimationUtility.SetEditorCurve(curvesOwner.curves, binding, curve);
+
+            return true;
+        }
+
+        public static void SanitizeCurvesData(this ICurvesOwner curvesOwner)
+        {
+            var curves = curvesOwner.curves;
+            if (curves == null)
+                return;
+
+            // Remove any 0-length curves
+            foreach (var binding in AnimationUtility.GetCurveBindings(curves))
+            {
+                var curve = AnimationUtility.GetEditorCurve(curves, binding);
+                if (curve.length == 0)
+                    AnimationUtility.SetEditorCurve(curves, binding, null);
+            }
+
+            // If no curves remain, delete the curves asset
+            if (curves.empty)
+            {
+                var track = curvesOwner.targetTrack;
+                var timeline = track != null ? track.timelineAsset : null;
+                TimelineUndo.PushDestroyUndo(timeline, track, curves, "Delete Parameter Curves");
+            }
+        }
+
+        public static bool AddAnimatedParameter(this ICurvesOwner curvesOwner, string parameterName)
+        {
+            var newBinding = new EditorCurveBinding();
+
+            SerializedProperty property;
+            if (!InternalAddParameter(curvesOwner, parameterName, ref newBinding, out property))
+                return false;
+
+            var duration = (float)curvesOwner.duration;
+            CurveEditUtility.AddKey(curvesOwner.curves, newBinding, property, 0);
+            CurveEditUtility.AddKey(curvesOwner.curves, newBinding, property, duration);
+            return true;
+        }
+
+        public static bool RemoveAnimatedParameter(this ICurvesOwner curvesOwner, string parameterName)
+        {
+            if (!curvesOwner.IsParameterAnimated(parameterName) || curvesOwner.curves == null)
+                return false;
+
+            var binding = curvesOwner.GetCurveBinding(parameterName);
+            AnimationUtility.SetEditorCurve(curvesOwner.curves, binding, null);
+            return true;
+        }
+
+        // Set an animated parameter. Requires the field identifier 'position.x', but will add default curves to all fields
+        public static bool SetAnimatedParameter(this ICurvesOwner curvesOwner, string parameterName, AnimationCurve curve)
+        {
+            // this will add a basic curve for all the related parameters
+            if (!curvesOwner.IsParameterAnimated(parameterName) && !curvesOwner.AddAnimatedParameter(parameterName))
+                return false;
+
+            var binding = curvesOwner.GetCurveBinding(parameterName);
+            AnimationUtility.SetEditorCurve(curvesOwner.curves, binding, curve);
+            return true;
+        }
+
+        static bool InternalAddParameter([NotNull] ICurvesOwner curvesOwner, string parameterName, ref EditorCurveBinding binding, out SerializedProperty property)
+        {
+            property = null;
+
+            if (curvesOwner.IsParameterAnimated(parameterName))
+                return false;
+
+            var serializedObject = AnimatedParameterUtility.GetSerializedPlayableAsset(curvesOwner.asset);
+            if (serializedObject == null)
+                return false;
+
+            property = serializedObject.FindProperty(parameterName);
+            if (property == null || !AnimatedParameterUtility.IsTypeAnimatable(property.propertyType))
+                return false;
+
+            if (curvesOwner.curves == null)
+                curvesOwner.CreateCurves(curvesOwner.GetUniqueRecordedClipName());
+
+            binding = curvesOwner.GetCurveBinding(parameterName);
+            return true;
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimatedParameterExtensions.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimatedParameterExtensions.cs.meta
new file mode 100644
index 0000000..21de3d3
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimatedParameterExtensions.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 7d3aa106cfe752241997b3759bf80163
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimationTrackExtensions.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimationTrackExtensions.cs
new file mode 100644
index 0000000..41677ec
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimationTrackExtensions.cs
@@ -0,0 +1,134 @@
+using System.Linq;
+using UnityEngine;
+using UnityEngine.Timeline;
+
+namespace UnityEditor.Timeline
+{
+    static class AnimationTrackExtensions
+    {
+        public static void ConvertToClipMode(this AnimationTrack track)
+        {
+            if (!track.CanConvertToClipMode())
+                return;
+
+            TimelineUndo.PushUndo(track, "Convert To Clip");
+
+            if (!track.infiniteClip.empty)
+            {
+                var animClip = track.infiniteClip;
+                TimelineUndo.PushUndo(animClip, "Convert To Clip");
+                TimelineUndo.PushUndo(track, "Convert To Clip");
+                var start = AnimationClipCurveCache.Instance.GetCurveInfo(animClip).keyTimes.FirstOrDefault();
+                animClip.ShiftBySeconds(-start);
+
+                track.infiniteClip = null;
+                var clip = track.CreateClip(animClip);
+
+                clip.start = start;
+                clip.preExtrapolationMode = track.infiniteClipPreExtrapolation;
+                clip.postExtrapolationMode = track.infiniteClipPostExtrapolation;
+                clip.recordable = true;
+                if (Mathf.Abs(animClip.length) < TimelineClip.kMinDuration)
+                {
+                    clip.duration = 1;
+                }
+
+                var animationAsset = clip.asset as AnimationPlayableAsset;
+                if (animationAsset)
+                {
+                    animationAsset.position = track.infiniteClipOffsetPosition;
+                    animationAsset.eulerAngles = track.infiniteClipOffsetEulerAngles;
+
+                    // going to / from infinite mode should reset this. infinite mode
+                    animationAsset.removeStartOffset = track.infiniteClipRemoveOffset;
+                    animationAsset.applyFootIK = track.infiniteClipApplyFootIK;
+                    animationAsset.loop = track.infiniteClipLoop;
+
+                    track.infiniteClipOffsetPosition = Vector3.zero;
+                    track.infiniteClipOffsetEulerAngles = Vector3.zero;
+                }
+
+                track.CalculateExtrapolationTimes();
+            }
+
+            track.infiniteClip = null;
+
+            EditorUtility.SetDirty(track);
+        }
+
+        public static void ConvertFromClipMode(this AnimationTrack track, TimelineAsset timeline)
+        {
+            if (!track.CanConvertFromClipMode())
+                return;
+
+            TimelineUndo.PushUndo(track, "Convert From Clip");
+
+            var clip = track.clips[0];
+            var delta = (float)clip.start;
+            track.infiniteClipTimeOffset = 0.0f;
+            track.infiniteClipPreExtrapolation = clip.preExtrapolationMode;
+            track.infiniteClipPostExtrapolation = clip.postExtrapolationMode;
+
+            var animAsset = clip.asset as AnimationPlayableAsset;
+            if (animAsset)
+            {
+                track.infiniteClipOffsetPosition = animAsset.position;
+                track.infiniteClipOffsetEulerAngles = animAsset.eulerAngles;
+                track.infiniteClipRemoveOffset = animAsset.removeStartOffset;
+                track.infiniteClipApplyFootIK = animAsset.applyFootIK;
+                track.infiniteClipLoop = animAsset.loop;
+            }
+
+            // clone it, it may not be in the same asset
+            var animClip = clip.animationClip;
+
+            float scale = (float)clip.timeScale;
+            if (!Mathf.Approximately(scale, 1.0f))
+            {
+                if (!Mathf.Approximately(scale, 0.0f))
+                    scale = 1.0f / scale;
+                animClip.ScaleTime(scale);
+            }
+
+            TimelineUndo.PushUndo(animClip, "Convert From Clip");
+            animClip.ShiftBySeconds(delta);
+
+            // manually delete the clip
+            var asset = clip.asset;
+            clip.asset = null;
+
+            // Remove the clip, remove old assets
+            ClipModifier.Delete(timeline, clip);
+            TimelineUndo.PushDestroyUndo(null, track, asset, "Convert From Clip");
+
+            track.infiniteClip = animClip;
+
+            EditorUtility.SetDirty(track);
+        }
+
+        public static bool CanConvertToClipMode(this AnimationTrack track)
+        {
+            if (track == null || track.inClipMode)
+                return false;
+            return (track.infiniteClip != null && !track.infiniteClip.empty);
+        }
+
+        // Requirements to go from clip mode
+        //  - one clip, recordable, and animation clip belongs to the same asset as the track
+        public static bool CanConvertFromClipMode(this AnimationTrack track)
+        {
+            if ((track == null) ||
+                (!track.inClipMode) ||
+                (track.clips.Length != 1) ||
+                (track.clips[0].start < 0) ||
+                (!track.clips[0].recordable))
+                return false;
+
+            var asset = track.clips[0].asset as AnimationPlayableAsset;
+            if (asset == null)
+                return false;
+
+            return TimelineHelpers.HaveSameContainerAsset(track, asset.clip);
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimationTrackExtensions.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimationTrackExtensions.cs.meta
new file mode 100644
index 0000000..df81151
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/AnimationTrackExtensions.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 5a31542ccf4e8584ca4f60843e9d02d0
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/TrackExtensions.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/TrackExtensions.cs
new file mode 100644
index 0000000..637e239
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/TrackExtensions.cs
@@ -0,0 +1,495 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+using UnityEngine.Timeline;
+using UnityEngine.Playables;
+
+namespace UnityEditor.Timeline
+{
+    // Editor-only extension methods on track assets
+    static class TrackExtensions
+    {
+        public static readonly double kMinOverlapTime = TimeUtility.kTimeEpsilon * 1000;
+
+        public static AnimationClip GetOrCreateClip(this AnimationTrack track)
+        {
+            if (track.infiniteClip == null && !track.inClipMode)
+                track.CreateInfiniteClip(AnimationTrackRecorder.GetUniqueRecordedClipName(track, AnimationTrackRecorder.kRecordClipDefaultName));
+
+            return track.infiniteClip;
+        }
+
+        public static TimelineClip CreateClip(this TrackAsset track, double time)
+        {
+            var attr = track.GetType().GetCustomAttributes(typeof(TrackClipTypeAttribute), true);
+
+            if (attr.Length == 0)
+                return null;
+
+            if (TimelineWindow.instance.state == null)
+                return null;
+
+            if (attr.Length == 1)
+            {
+                var clipClass = (TrackClipTypeAttribute)attr[0];
+
+                var clip =  TimelineHelpers.CreateClipOnTrack(clipClass.inspectedType, track, TimelineWindow.instance.state);
+                clip.start = time;
+                return clip;
+            }
+
+            return null;
+        }
+
+        static bool Overlaps(TimelineClip blendOut, TimelineClip blendIn)
+        {
+            if (blendIn == blendOut)
+                return false;
+
+            if (Math.Abs(blendIn.start - blendOut.start) < TimeUtility.kTimeEpsilon)
+            {
+                return blendIn.duration >= blendOut.duration;
+            }
+
+            return blendIn.start >= blendOut.start && blendIn.start < blendOut.end;
+        }
+
+        public static void ComputeBlendsFromOverlaps(this TrackAsset asset)
+        {
+            ComputeBlendsFromOverlaps(asset.clips);
+        }
+
+        internal static void ComputeBlendsFromOverlaps(TimelineClip[] clips)
+        {
+            foreach (var clip in clips)
+            {
+                clip.blendInDuration = -1;
+                clip.blendOutDuration = -1;
+            }
+
+            foreach (var clip in clips)
+            {
+                var blendIn = clip;
+                var blendOut = clips
+                    .Where(c => Overlaps(c, blendIn))
+                    .OrderBy(c => c.start)
+                    .FirstOrDefault();
+
+                if (blendOut != null)
+                {
+                    UpdateClipIntersection(blendOut, blendIn);
+                }
+            }
+        }
+
+        internal static void UpdateClipIntersection(TimelineClip blendOutClip, TimelineClip blendInClip)
+        {
+            if (!blendOutClip.SupportsBlending() || !blendInClip.SupportsBlending())
+                return;
+
+            if (blendInClip.end < blendOutClip.end)
+                return;
+
+            double duration = Math.Max(0, blendOutClip.start + blendOutClip.duration - blendInClip.start);
+            duration = duration <= kMinOverlapTime ? 0 : duration;
+            blendOutClip.blendOutDuration = duration;
+            blendInClip.blendInDuration = duration;
+
+            var blendInMode = blendInClip.blendInCurveMode;
+            var blendOutMode = blendOutClip.blendOutCurveMode;
+
+            if (blendInMode == TimelineClip.BlendCurveMode.Manual && blendOutMode == TimelineClip.BlendCurveMode.Auto)
+            {
+                blendOutClip.mixOutCurve = CurveEditUtility.CreateMatchingCurve(blendInClip.mixInCurve);
+            }
+            else if (blendInMode == TimelineClip.BlendCurveMode.Auto && blendOutMode == TimelineClip.BlendCurveMode.Manual)
+            {
+                blendInClip.mixInCurve = CurveEditUtility.CreateMatchingCurve(blendOutClip.mixOutCurve);
+            }
+            else if (blendInMode == TimelineClip.BlendCurveMode.Auto && blendOutMode == TimelineClip.BlendCurveMode.Auto)
+            {
+                blendInClip.mixInCurve = null; // resets to default curves
+                blendOutClip.mixOutCurve = null;
+            }
+        }
+
+        internal static void RecursiveSubtrackClone(TrackAsset source, TrackAsset duplicate, IExposedPropertyTable sourceTable, IExposedPropertyTable destTable, PlayableAsset assetOwner)
+        {
+            var subtracks = source.GetChildTracks();
+            foreach (var sub in subtracks)
+            {
+                var newSub = TimelineHelpers.Clone(duplicate, sub, sourceTable, destTable, assetOwner);
+                duplicate.AddChild(newSub);
+                RecursiveSubtrackClone(sub, newSub, sourceTable, destTable, assetOwner);
+
+                // Call the custom editor on Create
+                var customEditor = CustomTimelineEditorCache.GetTrackEditor(newSub);
+                try
+                {
+                    customEditor.OnCreate(newSub, sub);
+                }
+                catch (Exception e)
+                {
+                    Debug.LogException(e);
+                }
+
+                // registration has to happen AFTER recursion
+                TimelineCreateUtilities.SaveAssetIntoObject(newSub, assetOwner);
+                TimelineUndo.RegisterCreatedObjectUndo(newSub, "Duplicate");
+            }
+        }
+
+        internal static TrackAsset Duplicate(this TrackAsset track, IExposedPropertyTable sourceTable, IExposedPropertyTable destTable,
+            TimelineAsset destinationTimeline = null)
+        {
+            if (track == null)
+                return null;
+
+            // if the destination is us, clear to avoid bad parenting (case 919421)
+            if (destinationTimeline == track.timelineAsset)
+                destinationTimeline = null;
+
+            var timelineParent = track.parent as TimelineAsset;
+            var trackParent = track.parent as TrackAsset;
+            if (timelineParent == null && trackParent == null)
+            {
+                Debug.LogWarning("Cannot duplicate track because it is not parented to known type");
+                return null;
+            }
+
+            // Determine who the final parent is. If we are pasting into another track, it's always the timeline.
+            //  Otherwise it's the original parent
+            PlayableAsset finalParent = destinationTimeline != null ? destinationTimeline : track.parent;
+
+            // grab the list of tracks to generate a name from (923360) to get the list of names
+            // no need to do this part recursively
+            var finalTrackParent = finalParent as TrackAsset;
+            var finalTimelineAsset = finalParent as TimelineAsset;
+            var otherTracks = (finalTimelineAsset != null) ? finalTimelineAsset.trackObjects : finalTrackParent.subTracksObjects;
+
+            // Important to create the new objects before pushing the original undo, or redo breaks the
+            //  sequence
+            var newTrack = TimelineHelpers.Clone(finalParent, track, sourceTable, destTable, finalParent);
+            newTrack.name = TimelineCreateUtilities.GenerateUniqueActorName(otherTracks, newTrack.name);
+
+            RecursiveSubtrackClone(track, newTrack, sourceTable, destTable, finalParent);
+            TimelineCreateUtilities.SaveAssetIntoObject(newTrack, finalParent);
+            TimelineUndo.RegisterCreatedObjectUndo(newTrack, "Duplicate");
+            TimelineUndo.PushUndo(finalParent, "Duplicate");
+
+            if (destinationTimeline != null) // other timeline
+                destinationTimeline.AddTrackInternal(newTrack);
+            else if (timelineParent != null) // this timeline, no parent
+                ReparentTracks(new List<TrackAsset> { newTrack }, timelineParent, timelineParent.GetRootTracks().Last(), false);
+            else // this timeline, with parent
+                trackParent.AddChild(newTrack);
+
+            // Call the custom editor. this check prevents the call when copying to the clipboard
+            if (destinationTimeline == null || destinationTimeline == TimelineEditor.inspectedAsset)
+            {
+                var customEditor = CustomTimelineEditorCache.GetTrackEditor(newTrack);
+                try
+                {
+                    customEditor.OnCreate(newTrack, track);
+                }
+                catch (Exception e)
+                {
+                    Debug.LogException(e);
+                }
+            }
+
+            return newTrack;
+        }
+
+        // Reparents a list of tracks to a new parent
+        //  the new parent cannot be null (has to be track asset or sequence)
+        //  the insertAfter can be null (will not reorder)
+        internal static bool ReparentTracks(List<TrackAsset> tracksToMove, PlayableAsset targetParent,
+            TrackAsset insertMarker = null, bool insertBefore = false)
+        {
+            var targetParentTrack = targetParent as TrackAsset;
+            var targetSequenceTrack = targetParent as TimelineAsset;
+
+            if (tracksToMove == null || tracksToMove.Count == 0 || (targetParentTrack == null && targetSequenceTrack == null))
+                return false;
+
+            // invalid parent type on a track
+            if (targetParentTrack != null && tracksToMove.Any(x => !TimelineCreateUtilities.ValidateParentTrack(targetParentTrack, x.GetType())))
+                return false;
+
+            // no valid tracks means this is simply a rearrangement
+            var validTracks = tracksToMove.Where(x => x.parent != targetParent).ToList();
+            if (insertMarker == null && !validTracks.Any())
+                return false;
+
+            var parents = validTracks.Select(x => x.parent).Where(x => x != null).Distinct().ToList();
+
+            // push the current state of the tracks that will change
+            foreach (var p in parents)
+            {
+                TimelineUndo.PushUndo(p, "Reparent");
+            }
+            foreach (var t in validTracks)
+            {
+                TimelineUndo.PushUndo(t, "Reparent");
+            }
+            TimelineUndo.PushUndo(targetParent, "Reparent");
+
+            // need to reparent tracks first, before moving them.
+            foreach (var t in validTracks)
+            {
+                if (t.parent != targetParent)
+                {
+                    TrackAsset toMoveParent = t.parent as TrackAsset;
+                    TimelineAsset toMoveTimeline = t.parent as TimelineAsset;
+                    if (toMoveTimeline != null)
+                    {
+                        toMoveTimeline.RemoveTrack(t);
+                    }
+                    else if (toMoveParent != null)
+                    {
+                        toMoveParent.RemoveSubTrack(t);
+                    }
+
+                    if (targetParentTrack != null)
+                    {
+                        targetParentTrack.AddChild(t);
+                        targetParentTrack.SetCollapsed(false);
+                    }
+                    else
+                    {
+                        targetSequenceTrack.AddTrackInternal(t);
+                    }
+                }
+            }
+
+
+            if (insertMarker != null)
+            {
+                // re-ordering track. This is using internal APIs, so invalidation of the tracks must be done manually to avoid
+                //  cache mismatches
+                var children = targetParentTrack != null ? targetParentTrack.subTracksObjects : targetSequenceTrack.trackObjects;
+                TimelineUtility.ReorderTracks(children, tracksToMove, insertMarker, insertBefore);
+                if (targetParentTrack != null)
+                    targetParentTrack.Invalidate();
+                if (insertMarker.timelineAsset != null)
+                    insertMarker.timelineAsset.Invalidate();
+            }
+
+            return true;
+        }
+
+        internal static IEnumerable<TrackAsset> FilterTracks(IEnumerable<TrackAsset> tracks)
+        {
+            var nTracks = tracks.Count();
+            // Duplicate is recursive. If should not have parent and child in the list
+            var hash = new HashSet<TrackAsset>(tracks);
+            var take = new Dictionary<TrackAsset, bool>(nTracks);
+
+            foreach (var track in tracks)
+            {
+                var parent = track.parent as TrackAsset;
+                var foundParent = false;
+                // go up the hierarchy
+                while (parent != null && !foundParent)
+                {
+                    if (hash.Contains(parent))
+                    {
+                        foundParent = true;
+                    }
+
+                    parent = parent.parent as TrackAsset;
+                }
+
+                take[track] = !foundParent;
+            }
+
+            foreach (var track in tracks)
+            {
+                if (take[track])
+                    yield return track;
+            }
+        }
+
+        internal static bool IsVisibleRecursive(this TrackAsset track)
+        {
+            var t = track;
+            while ((t = t.parent as TrackAsset) != null)
+            {
+                if (t.GetCollapsed())
+                    return false;
+            }
+
+            return true;
+        }
+
+        internal static bool GetCollapsed(this TrackAsset track)
+        {
+            return TimelineWindowViewPrefs.IsTrackCollapsed(track);
+        }
+
+        internal static void SetCollapsed(this TrackAsset track, bool collapsed)
+        {
+            TimelineWindowViewPrefs.SetTrackCollapsed(track, collapsed);
+        }
+
+        internal static bool GetShowMarkers(this TrackAsset track)
+        {
+            return TimelineWindowViewPrefs.IsShowMarkers(track);
+        }
+
+        internal static void SetShowMarkers(this TrackAsset track, bool collapsed)
+        {
+            TimelineWindowViewPrefs.SetTrackShowMarkers(track, collapsed);
+        }
+
+        internal static bool GetShowInlineCurves(this TrackAsset track)
+        {
+            return TimelineWindowViewPrefs.GetShowInlineCurves(track);
+        }
+
+        internal static void SetShowInlineCurves(this TrackAsset track, bool inlineOn)
+        {
+            TimelineWindowViewPrefs.SetShowInlineCurves(track, inlineOn);
+        }
+
+        internal static bool ShouldShowInfiniteClipEditor(this TrackAsset track)
+        {
+            var animationTrack = track as AnimationTrack;
+            if (animationTrack != null)
+                return animationTrack.ShouldShowInfiniteClipEditor();
+
+            return track.HasAnyAnimatableParameters();
+        }
+
+        internal static bool ShouldShowInfiniteClipEditor(this AnimationTrack track)
+        {
+            return track != null && !track.inClipMode && track.infiniteClip != null;
+        }
+
+        // Special method to remove a track that is in a broken state. i.e. the script won't load
+        internal static bool RemoveBrokenTrack(PlayableAsset parent, ScriptableObject track)
+        {
+            var parentTrack = parent as TrackAsset;
+            var parentTimeline = parent as TimelineAsset;
+
+            if (parentTrack == null && parentTimeline == null)
+                throw new ArgumentException("parent is not a valid parent type", "parent");
+
+            // this object must be a Unity null, but not actually null;
+            object trackAsObject = track;
+            if (trackAsObject == null || track != null) // yes, this is correct
+                throw new ArgumentException("track is not in a broken state");
+
+            // this belongs to a parent track
+            if (parentTrack != null)
+            {
+                int index = parentTrack.subTracksObjects.FindIndex(t => t.GetInstanceID() == track.GetInstanceID());
+                if (index >= 0)
+                {
+                    TimelineUndo.PushUndo(parentTrack, "Remove Track");
+                    parentTrack.subTracksObjects.RemoveAt(index);
+                    parentTrack.Invalidate();
+                    Undo.DestroyObjectImmediate(track);
+                    return true;
+                }
+            }
+            else if (parentTimeline != null)
+            {
+                int index = parentTimeline.trackObjects.FindIndex(t => t.GetInstanceID() == track.GetInstanceID());
+                if (index >= 0)
+                {
+                    TimelineUndo.PushUndo(parentTimeline, "Remove Track");
+                    parentTimeline.trackObjects.RemoveAt(index);
+                    parentTimeline.Invalidate();
+                    Undo.DestroyObjectImmediate(track);
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        // Find the gap at the given time
+        //  return true if there is a gap, false if there is an intersection
+        // endGap will be Infinity if the gap has no end
+        internal static bool GetGapAtTime(this TrackAsset track, double time, out double startGap, out double endGap)
+        {
+            startGap = 0;
+            endGap = Double.PositiveInfinity;
+
+            if (track == null || !track.GetClips().Any())
+            {
+                return false;
+            }
+
+            var discreteTime = new DiscreteTime(time);
+
+            track.SortClips();
+            var sortedByStartTime = track.clips;
+            for (int i = 0; i < sortedByStartTime.Length; i++)
+            {
+                var clip = sortedByStartTime[i];
+
+                // intersection
+                if (discreteTime >= new DiscreteTime(clip.start) && discreteTime < new DiscreteTime(clip.end))
+                {
+                    endGap = time;
+                    startGap = time;
+                    return false;
+                }
+
+                if (clip.end < time)
+                {
+                    startGap = clip.end;
+                }
+                if (clip.start > time)
+                {
+                    endGap = clip.start;
+                    break;
+                }
+            }
+
+            if (endGap - startGap < TimelineClip.kMinDuration)
+            {
+                startGap = time;
+                endGap = time;
+                return false;
+            }
+
+            return true;
+        }
+
+        public static bool IsCompatibleWithClip(this TrackAsset track, TimelineClip clip)
+        {
+            if (track == null || clip == null || clip.asset == null)
+                return false;
+
+            return TypeUtility.GetPlayableAssetsHandledByTrack(track.GetType()).Contains(clip.asset.GetType());
+        }
+
+        // Get a flattened list of all child tracks
+        public static void GetFlattenedChildTracks(this TrackAsset asset, List<TrackAsset> list)
+        {
+            if (asset == null || list == null)
+                return;
+
+            foreach (var track in asset.GetChildTracks())
+            {
+                list.Add(track);
+                GetFlattenedChildTracks(track, list);
+            }
+        }
+
+        public static IEnumerable<TrackAsset> GetFlattenedChildTracks(this TrackAsset asset)
+        {
+            if (asset == null || !asset.GetChildTracks().Any())
+                return Enumerable.Empty<TrackAsset>();
+
+            var flattenedChildTracks = new List<TrackAsset>();
+            GetFlattenedChildTracks(asset, flattenedChildTracks);
+            return flattenedChildTracks;
+        }
+    }
+}
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/TrackExtensions.cs.meta b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/TrackExtensions.cs.meta
new file mode 100644
index 0000000..1e9f0c2
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Extensions/TrackExtensions.cs.meta
@@ -0,0 +1,11 @@
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