Method ApplyAllInternal

Source/Engine/Level/Prefabs/Prefab.Apply.cpp:826–1219

}

bool Prefab::ApplyAllInternal(Actor* targetActor, bool linkTargetActorObjectToPrefab, PrefabInstancesData& prefabInstancesData)
{
    PROFILE_CPU_NAMED("Prefab.Apply");
    ScopeLock lock(Locker);
    const auto prefabId = GetID();
    const auto oldRootId = GetRootObjectId();
    const auto newRootId = targetActor->GetPrefabObjectID();

    // Gather all scene objects in target instance (reused later)
    CollectionPoolCache<ActorsCache::SceneObjectsListType>::ScopeCache targetObjects = ActorsCache::SceneObjectsListCache.Get();
    targetObjects->EnsureCapacity(ObjectsCount * 4);
    SceneQuery::GetAllSerializableSceneObjects(targetActor, *targetObjects.Value);
    if (PrefabManager::FilterPrefabInstancesToSave(prefabId, *targetObjects.Value))
        return true;
    LOG(Info, "Applying prefab changes from actor {0} (total objects count: {2}) to {1}...", targetActor->ToString(), ToString(), targetObjects->Count());
    Array<Guid> oldObjectsIds = ObjectsIds;

    // Serialize to json data
    rapidjson_flax::StringBuffer dataBuffer;
    {
        CompactJsonWriter writerObj(dataBuffer);
        JsonWriter& writer = writerObj;
        writer.StartArray();
        for (int32 i = 0; i < targetObjects->Count(); i++)
        {
            SceneObject* obj = targetObjects.Value->At(i);

            // Check the whole chain of prefab references to be valid for this object
            bool brokenPrefab = false;
            Guid nestedPrefabId = obj->GetPrefabID(), nestedPrefabObjectId = obj->GetPrefabObjectID();
            while (!brokenPrefab && nestedPrefabId.IsValid() && nestedPrefabObjectId.IsValid())
            {
                auto prefab = Content::Load<Prefab>(nestedPrefabId);
                if (prefab)
                {
                    prefab->GetNestedObject(nestedPrefabObjectId, nestedPrefabId, nestedPrefabObjectId);
                }
                else
                {
                    LOG(Warning, "Missing prefab {0}.", nestedPrefabId);
                    brokenPrefab = true;
                }
            }
            if (brokenPrefab)
            {
                LOG(Warning, "Broken prefab reference on object {0}. Breaking linkage to inline object inside prefab.", GetObjectName(obj));
                obj->BreakPrefabLink();
            }

            writer.SceneObject(obj);
        }
        writer.EndArray();
    }

    // Parse json document and modify serialized data to extract only modified properties
    rapidjson_flax::Document diffDataDocument;
    Dictionary<Guid, int32> diffPrefabObjectIdToDataIndex; // Maps Prefab Object Id -> Actor Data index in diffDataDocument json array (for actors/scripts to modify prefab)
    Dictionary<Guid, int32> newPrefabInstanceIdToDataIndex; // Maps Prefab Instance Id -> Actor Data index in diffDataDocument json array (for new actors/scripts to add to prefab), maps to -1 for scripts