Created
April 28, 2022 08:11
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[Unity] Retrieve a component's fileId and its gameObject's asset guid (if any)
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| /// <summary>Universal method for retrieving the fileId of a component inside a saved gameObject, and the guid to the file that contains the gameObject. | |
| /// The gameObject could live in a prefab or in a scene, and the component does not need to be at the root gameObject of the prefab.</summary> | |
| /// <param name="comp"></param> | |
| /// <returns>A tuple containing the guid and the fileId of the component. Returns null if the component's gameObject has not been saved to a scene or a prefab.</returns> | |
| public static Tuple<string, long> GetComponentIdentifiers(Component comp) | |
| { | |
| // Check if the component is the direct instance from the prefab. | |
| // In the Editor, this means that the prefab asset is selected and the component is showing in the Inspector. | |
| if (AssetDatabase.TryGetGUIDAndLocalFileIdentifier(comp, out string guid, out long fileId)) | |
| { | |
| return new Tuple<string, long>(guid, fileId); | |
| } | |
| // Check if the component comes from a prefab that has been added to a scene. | |
| var origComp = PrefabUtility.GetCorrespondingObjectFromSource(comp); | |
| if (origComp != null && AssetDatabase.TryGetGUIDAndLocalFileIdentifier(origComp, out guid, out fileId)) | |
| { | |
| return new Tuple<string, long>(guid, fileId); | |
| } | |
| // Last resort: check if the component comes from a prefab that is being edited in the prefab mode. | |
| var prefabStage = PrefabStageUtility.GetPrefabStage(comp.gameObject); | |
| if (prefabStage != null) | |
| { | |
| guid = AssetDatabase.AssetPathToGUID(prefabStage.prefabAssetPath); | |
| if (!guid.IsNullOrEmpty()) | |
| { | |
| fileId = GetLocalIdentifierInFile(comp); | |
| return new Tuple<string, long>(guid, fileId); | |
| } | |
| } | |
| Log.Error($"Have you saved the prefab? Is it a prefab? Component {comp.GetType().Name} in gameObject {comp.gameObject.name} has no GUID or fileID assigned!"); | |
| return null; | |
| } | |
| /// <summary>Also called fileID.</summary> | |
| /// <param name="o"></param> | |
| /// <returns>0 if not part of an asset. Otherwise, the fileID.</returns> | |
| public static long GetLocalIdentifierInFile(UnityEngine.Object o) | |
| { | |
| // This code was downloaded from https://gist.github.com/peposso/4aa72435771d29ed20971916bdb6c12a | |
| // That link contains other potentially useful methods that we might need in the future. | |
| var inspectorModeInfo = typeof(SerializedObject).GetProperty("inspectorMode", BindingFlags.NonPublic | BindingFlags.Instance); | |
| if (inspectorModeInfo != null) | |
| { | |
| var so = new SerializedObject(o); | |
| inspectorModeInfo.SetValue(so, InspectorMode.Debug, null); | |
| var prop = so.FindProperty("m_LocalIdentfierInFile"); | |
| return prop.longValue; | |
| } | |
| return 0; | |
| } |
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