1 files changed, 62 insertions, 0 deletions
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Utilities/ControlPlayableUtility.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Utilities/ControlPlayableUtility.cs
new file mode 100644
index 0000000..d7023e4
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Utilities/ControlPlayableUtility.cs
@@ -0,0 +1,62 @@
+using System.Collections.Generic;
+using UnityEngine.Playables;
+using UnityEngine.Timeline;
+
+namespace UnityEditor.Timeline
+{
+    static class ControlPlayableUtility
+    {
+        public static bool DetectCycle(
+            ControlPlayableAsset asset, PlayableDirector director, HashSet<PlayableDirector> set = null)
+        {
+            if (director == null || asset == null || !asset.updateDirector)
+                return false;
+
+            if (set == null)
+                set = new HashSet<PlayableDirector>();
+
+            if (set.Contains(director))
+                return true;
+
+            var gameObject = asset.sourceGameObject.Resolve(director);
+            if (gameObject == null)
+                return false;
+
+            set.Add(director);
+
+            foreach (var subDirector in asset.GetComponent<PlayableDirector>(gameObject))
+            {
+                foreach (var childAsset in GetPlayableAssets(subDirector))
+                {
+                    if (DetectCycle(childAsset, subDirector, set))
+                        return true;
+                }
+            }
+
+            set.Remove(director);
+
+            return false;
+        }
+
+        public static IEnumerable<ControlPlayableAsset> GetPlayableAssets(PlayableDirector director)
+        {
+            var timeline = director != null ? (director.playableAsset as TimelineAsset) : null;
+            if (timeline != null)
+            {
+                foreach (var t in timeline.GetOutputTracks())
+                {
+                    var controlTrack = t as ControlTrack;
+                    if (controlTrack != null)
+                    {
+                        foreach (var c in t.GetClips())
+                        {
+                            var asset = c.asset as ControlPlayableAsset;
+                            if (asset != null)
+                                yield return asset;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}