LevelInstanceEditorLevelStreaming.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "Engine/LevelStreamingAlwaysLoaded.h"
#include "LevelInstance/LevelInstanceTypes.h"
#include "WorldPartition/ActorDescContainerInstance.h"
#include "LevelInstanceEditorLevelStreaming.generated.h"
 
class ILevelInstanceInterface;
 
UCLASS(Transient, MinimalAPI)
class ULevelStreamingLevelInstanceEditor : public ULevelStreamingAlwaysLoaded
{
    GENERATED_UCLASS_BODY()
 
public:
#if WITH_EDITOR
    virtual bool ShowInLevelCollection() const override { return true; }
    virtual bool IsUserManaged() const override { return false; }
    ILevelInstanceInterface* GetLevelInstance() const;
    const FLevelInstanceID& GetLevelInstanceID() const { return LevelInstanceID; }
    FBox GetBounds() const;
 
    virtual TOptional<FFolder::FRootObject> GetFolderRootObject() const override;
protected:
    void OnLevelActorAdded(AActor* InActor);
    void OnLoadedActorsAddedToLevelPreEvent(const TArray<AActor*>& InActors);
    void OnPreInitializeContainerInstance(UActorDescContainerInstance::FInitializeParams& InInitParams, UActorDescContainerInstance* InContainerInstance);
 
    friend class ULevelInstanceSubsystem;
 
    static ULevelStreamingLevelInstanceEditor* Load(ILevelInstanceInterface* LevelInstance);
    static void Unload(ULevelStreamingLevelInstanceEditor* LevelStreaming);
 
    virtual void OnLevelLoadedChanged(ULevel* Level) override;
private:
    FLevelInstanceID LevelInstanceID;
 
    // When creating a new LevelInstance initialize UActorDescContainerInstance using those values
    UActorDescContainerInstance* ParentContainerInstance = nullptr;
    FGuid ParentContainerGuid;
#endif
};