Opening the Prefab Stage from an Editor Tool.

Hey there,

I'm looking for any answers on how to do this if this is available yet.

I've seen the PrefabStage and PrefabStageUtility scripts posted to the Unity Github and could see there's a LoadStage and OpenStage method. Both are internal however. That means after I create a new prefab within my editor tool, I can't open that prefab within the Prefab Stage right away.

While this is just what I could see from my findings. I'd like to know if there is an actual way to open the prefab stage from code. And if there isn't, it seems weird to have several functions about going to a previous stage or the main stage but not the prefab stage.

Sorry if this is in the wrong category of forum. It was either here or the editor forum.

 

Opening a prefab in prefab mode can be done with AssetDatabase.OpenAsset.

It's not in any way intuitive.

 

@SteenLund I'm trying to force the editor into prefab mode with the prefab I just created.
@Baste Thank you, i'll give it a shot.

 

How does one tell the editor to wait until loading of the Prefab is done, and create additional/new Game Objects to the asset? Any GameObject I seem to create creates before the prefab is loaded and mode is switched.

For example, my current code stub:

Code (CSharp):

1. AssetDatabase.OpenAsset(screen);
2. Canvas canvasPreview = new GameObject("Canvas");

Same result with teh following:

Code (CSharp):

1. AssetDatabase.OpenAsset(screen);
2. PrefabUtility.ApplyAddedGameObject(new GameObject("Canvas"), $"Assets/{screen.name}.prefab", InteractionMode.AutomatedAction);

 

You can probably subscribe to PrefabStageOpened.

 

I suppose I could, but since it's an experimental name space I'm not guaranteed to have that in the future, so is there another method?

My previous code (in summation) was something like this through an EditorWindow where it would instantiate the Prefab and add some game objects to it upon instantiation:

Code (CSharp):

1. public class ScreenWindow : EditorWindow {
2.     public void OnGUI() {
3.         if (GUILayout.Button("Open") {
4.             GameObject canvasPreview = new GameObject("Canvas");
5.             canvasPreview.AddComponent<Canvas>();
6.             screen = PrefabUtility.InstantiatePrefab(ScreenManager.screen);
7.             (screen.transform as RectTransform).SetParent(canvasPreview.transform);
8.         }
9.     }
10. }

Adding a call to the event in the OnGUI obviously ran the code multiple times before the prefab finishes loading in isolation, and even then it seems I can't add/create GameObjects once in the Prefab isolation. So i'm just at a loss atm on how to have a button on an editor window open a prefab, add GameObjects to said prefab, and manipulate them appropriately.

Sorry, maybe I just need sleep.