Activating GameObjects from the animation clip

I want to use an EditorWindow to create animation curves that will activate my hitboxes at the correct time.

When adding manually a hitbox in my animation clip. I can see its type among other things: UnityEngine.GameObject
http://i.imgur.com/50mB7Qg.png

So I coded this:

Code (CSharp):

1. EditorCurveBinding bind = new EditorCurveBinding();
2. bind.type = typeof(UnityEngine.GameObject);
3. bind.propertyName = "m_IsActive";
4. bind.path = "Hitboxes/" + hitbox.name;
5.  
6. var keys = new List<ObjectReferenceKeyframe>();
7.  
8. var keyOn = new ObjectReferenceKeyframe();
9. keyOn.value = hitbox.gameObject;
10. keyOn.time = 0f;
11.  
12. keys.Add(keyOn);
13.  
14. AnimationUtility.SetObjectReferenceCurve(anim, bind, keys.ToArray());

I get the following error because of AnimationUtility.SetObjectReferenceCurve:
"Can't assign curve because the type does not inherit from component". (http://i.imgur.com/XwjtnSE.png)

Indeed, typeof(GameObject) doesn't inherit from Component, but what can I do to make this work? Logically this should be possible since it can be done manually.

 

I found the solution:

Code (CSharp):

1.  
2. private void AddAnimationCurveAccordingToHitboxNames()
3.     {
4.         var spriteBind = new EditorCurveBinding();
5.         spriteBind.type = typeof(SpriteRenderer);
6.         spriteBind.propertyName = "m_Sprite";
7.  
8.         foreach (var hitbox in Hitboxes)
9.         {
10.             var goBinding = new EditorCurveBinding();
11.             goBinding.type = typeof(GameObject);
12.             goBinding.propertyName = "m_IsActive";
13.             goBinding.path = "Hitboxes/" + hitbox.name;
14.  
15.            
16.             foreach (var anim in AnimationClips)
17.             {
18.                 var frameTime = 1 / anim.frameRate;
19.  
20.                 var sprites = AnimationUtility.GetObjectReferenceCurve(anim, spriteBind);
21.  
22.                 // find the sprites that are named correctly and their time
23.                 foreach (var s in sprites)
24.                 {
25.                     var val = s.value;
26.                     var time = s.time;
27.  
28.                     var spriteName = FindNameWithoutTagWithoutVersion(val.name, true);
29.  
30.                     // TODO: This only works if there's 1 same sprite name per animation? Do we care?
31.                     // TODO: What if the hitbox is the last frame, it doesn't get deactivated
32.                     if (spriteName == hitbox.name)
33.                     {
34.                         var curve = new AnimationCurve();
35.  
36.                         var keyBefore = new Keyframe();
37.                         keyBefore.value = 0;
38.                         keyBefore.time = time - frameTime;
39.  
40.                         var keyAfter = new Keyframe();
41.                         keyAfter.value = 0;
42.                         keyAfter.time = time + frameTime;
43.  
44.                         var keyOn = new Keyframe();
45.                         keyOn.value = 1;
46.                         keyOn.time = time;
47.  
48.                         curve.AddKey(keyBefore);
49.                         curve.AddKey(keyOn);
50.                         curve.AddKey(keyAfter);
51.  
52.                         AnimationUtility.SetEditorCurve(anim, goBinding, curve);
53.                     }
54.                 }
55.             }
56.             AssetDatabase.SaveAssets();
57.             AssetDatabase.Refresh();
58.         }
59.     }
60.