Method ApplyAll

Source/Engine/Level/Prefabs/PrefabManager.cpp:544–594

}

bool PrefabManager::ApplyAll(Actor* instance)
{
    PROFILE_CPU_NAMED("Prefab.ApplyAll");

    // Validate input
    if (instance == nullptr)
    {
        Log::ArgumentNullException();
        return true;
    }
    if (!instance->HasPrefabLink() || instance->GetPrefabID() == Guid::Empty)
    {
        Log::ArgumentException(TEXT("The modified actor instance has missing prefab link."));
        return true;
    }

    // Get prefab asset
    auto prefab = Content::LoadAsync<Prefab>(instance->GetPrefabID());
    if (prefab == nullptr)
    {
        Log::Exception(TEXT("Missing prefab asset."));
        return true;
    }
    if (prefab->WaitForLoaded())
    {
        Log::Exception(TEXT("Failed to load prefab asset."));
        return true;
    }

    // Get root object of this prefab instance
    // Note: given actor instance can be already part of the spawned prefab or be a new actor added to the prefab instance
    // Find the actual root of the prefab instance
    const auto rootObjectId = prefab->GetRootObjectId();
    auto rootObjectInstance = instance;
    while (rootObjectInstance && rootObjectInstance->GetPrefabObjectID() != rootObjectId)
    {
        rootObjectInstance = rootObjectInstance->GetParent();
    }
    if (rootObjectInstance == nullptr)
    {
        // Use the input object as fallback
        rootObjectInstance = instance;
    }
    while (rootObjectInstance->GetParent() && rootObjectInstance->GetParent()->GetPrefabID() == rootObjectInstance->GetPrefabID())
    {
        // Move up to the root of the prefab instance (eg. in case of root change on instance to apply)
        rootObjectInstance = rootObjectInstance->GetParent();
    }

    return prefab->ApplyAll(rootObjectInstance);
}

#endif