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Editor callback for Prefab Mode being open

Discussion in 'Prefabs' started by rfadeev, Oct 9, 2018.

  1. rfadeev

    rfadeev

    Joined:
    Oct 1, 2013
    Posts:
    21
    Hi,

    During Unite Berlin 2018 "Technical Deep Dive into the New Prefab System" talk there was a question about is there an editor callback for Prefab Mode being opened and whether it's possible to set prefab editor environments by code:


    The answer from Unity staff was "Yes to both". Could anybody please advise which class references should I take a look for details about that?
     
  2. Mads-Nyholm

    Mads-Nyholm

    Unity Technologies

    Joined:
    Aug 19, 2013
    Posts:
    217
    Hi,

    You will find the callbacks in the
    PrefabStage
    class (namespace:
    UnityEditor.Experimental.SceneManagement
    )

    Usage example:

    Code (CSharp):
    1. using UnityEngine;
    2. using UnityEngine.SceneManagement;
    3. using UnityEditor;
    4. using UnityEditor.Experimental.SceneManagement;
    5.  
    6.  
    7. [InitializeOnLoad]
    8. class CustomPrefabEnvironment
    9. {
    10.     static CustomPrefabEnvironment()
    11.     {
    12.         PrefabStage.prefabStageOpened += OnPrefabStageOpened;
    13.     }
    14.  
    15.     static void OnPrefabStageOpened(PrefabStage prefabStage)
    16.     {
    17.         Debug.Log("OnPrefabStageOpened " + prefabStage.prefabAssetPath);
    18.  
    19.         // Get info from the PrefabStage
    20.         var root = prefabStage.prefabContentsRoot;
    21.         var scene = prefabStage.scene;
    22.         var renderer = root.GetComponent<Renderer>();
    23.  
    24.         // If no renderer skip our custom environment
    25.         if (renderer == null)
    26.             return;
    27.  
    28.         // Create environment plane
    29.         var plane = GameObject.CreatePrimitive(PrimitiveType.Plane);
    30.         SceneManager.MoveGameObjectToScene(plane, scene);
    31.  
    32.         // Adjust environment plane to the prefab root's lower bounds
    33.         Bounds bounds = renderer.bounds;
    34.         plane.transform.position = new Vector3(bounds.center.x, bounds.min.y, bounds.center.z);
    35.     }
    36. }
    37.  
     
    Last edited: Oct 20, 2020
  3. rfadeev

    rfadeev

    Joined:
    Oct 1, 2013
    Posts:
    21
    Great, thanks a lot for the detailed explanation!