Can't edit timeline clip from code after exiting play mode

Hey guys,

I made this simple example to show my problem. I create a timeline clip in code. And I'm able to edit its start time from the editor window just fine. However, as soon as I enter play, and then exit play mode. The link between my editor window start time and timeline clip is broken. What am I doing wrong?

Code (CSharp):

1. using UnityEditor;
2. using UnityEngine;
3. using UnityEngine.Playables;
4. using UnityEngine.Timeline;
5.  
6. public class TimelineExample : EditorWindow
7. {
8.     public TimelineClip m_Clip;
9.     private const float m_FPS = 30.0f;
10.  
11.  
12.     [MenuItem("Window/TimelineExample")]
13.     public static void ShowWindow()
14.     {
15.         GetWindow(typeof(TimelineExample));
16.     }
17.  
18.     void Awake()
19.     {
20.         GameObject newObject = new GameObject();
21.         PlayableDirector playableDirector = newObject.AddComponent<PlayableDirector>();
22.         TimelineAsset timelineAsset = CreateInstance<TimelineAsset>();
23.         timelineAsset.editorSettings.fps = m_FPS;
24.         playableDirector.playableAsset = timelineAsset;
25.         AssetDatabase.CreateAsset(timelineAsset, "Assets/timelineAsset.playable");
26.         AnimationTrack track = timelineAsset.CreateTrack<AnimationTrack>(null, "testTrack");
27.         m_Clip = track.CreateDefaultClip();
28.     }
29.  
30.     void OnGUI()
31.     {
32.         int startFrame = (int)(m_Clip.start * m_FPS);
33.         int newStartFrame;
34.         if (int.TryParse(EditorGUILayout.TextField("Start Frame:", startFrame.ToString()), out newStartFrame))
35.         {
36.             m_Clip.start = newStartFrame / m_FPS;
37.         }
38.     }
39.  
40.  
41.  
42. }
43.  

 

Hey Sean, thanks for response.

Does this mean that in order to keep track of a timeline clip, I have to do something like this in OnEnable everytime? Seems tedious.

Code (CSharp):

1. var tracks = timelineAsset.GetOutputTracks();
2. foreach (var track in tracks)
3. {
4.        foreach (var timelineClip in track.GetClips())
5.        {
6.            if (timelineClip.displayName == m_Clip.displayName) m_Clip = timelineClip;
7.        }
8. }