LevelInstanceLevelStreaming.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "Engine/LevelStreamingDynamic.h"
#include "LevelInstance/LevelInstanceTypes.h"
 
#if WITH_EDITOR
#include "WorldPartition/ActorDescContainerInstance.h"
#endif
 
#include "LevelInstanceLevelStreaming.generated.h"
 
class ILevelInstanceInterface;
class ALevelInstanceEditorInstanceActor;
 
UCLASS(Transient, MinimalAPI)
class ULevelStreamingLevelInstance : public ULevelStreamingDynamic
{
    GENERATED_UCLASS_BODY()
 
public:
    ENGINE_API ILevelInstanceInterface* GetLevelInstance() const;
 
#if WITH_EDITOR
    virtual bool ShowInLevelCollection() const override { return false; }
    virtual bool IsUserManaged() const override { return false; }
 
    ENGINE_API FBox GetBounds() const;
 
    ENGINE_API virtual TOptional<FFolder::FRootObject> GetFolderRootObject() const override;
#endif
    
protected:
    static ENGINE_API ULevelStreamingLevelInstance* LoadInstance(ILevelInstanceInterface* LevelInstanceActor);
    static ENGINE_API void UnloadInstance(ULevelStreamingLevelInstance* LevelStreaming);
 
    ENGINE_API virtual void OnLevelLoadedChanged(ULevel* Level) override;
 
    friend class ULevelInstanceSubsystem;
 
    const FLevelInstanceID& GetLevelInstanceID() const { return LevelInstanceID; }
private:
#if WITH_EDITOR
    void ResetLevelInstanceLoaders();
    
    ENGINE_API virtual void OnLoadedActorsAddedToLevelPreEvent(const TArray<AActor*>& InActors);
    ENGINE_API virtual void OnLoadedActorsAddedToLevelPostEvent(const TArray<AActor*>& InActors);
    ENGINE_API virtual void OnLoadedActorsRemovedFromLevelPostEvent(const TArray<AActor*>& InActors);
    ENGINE_API virtual void OnCurrentStateChanged(ELevelStreamingState InPrevState, ELevelStreamingState InNewState) override;
    ENGINE_API void OnPreInitializeContainerInstance(UActorDescContainerInstance::FInitializeParams& InInitParams, UActorDescContainerInstance* InContainerInstance);
    void InitializeActors(const TArray<AActor*>& InActors);
    void OnActorReplacedEvent(FWorldPartitionActorDescInstance* InActorDescInstance);
 
    enum EApplyPropertieOverrideType
    {
        PreConstruction,
        PostConstruction,
        PreAndPostConstruction
    };
 
    void ApplyPropertyOverrides(const TArray<AActor*>& InActor, bool bInAlreadyAppliedTransformOnActors, EApplyPropertieOverrideType InApplyPropertyOverrideType);
 
    bool IsEditorWorldMode() const;
 
    TWeakObjectPtr<ALevelInstanceEditorInstanceActor> LevelInstanceEditorInstanceActor;
 
    mutable FTransform CachedTransform;
    mutable FBox CachedBounds;
    bool bResetLoadersCalled;
#endif
    FLevelInstanceID LevelInstanceID;
};