Get GameState (or default values in gamestate) from Editor functions?

Development Programming & Scripting C++
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1

I am making an actor that spawns another actor on BeginPlay(). The appearance of the actor changes depending on an FName member of the spawning actor. When that FName is changed, it looks up a value from a data table to change the appearance. (If an item could not be found that matches the FName, it will display a sprite instead and won’t spawn anything.)

In other words, this:

AAGDroppedItemSpawner::AAGDroppedItemSpawner() : Super()
{
	SphereCollision = CreateDefaultSubobject<USphereComponent>(TEXT("SphereCollision"));
	SphereCollision->ShapeColor = FColor(76, 255, 76, 255);
	//SphereCollision->bOnlyDrawIfSelected = true;
	SphereCollision->bShouldCollideWhenPlacing = true;
	SphereCollision->SetShouldUpdatePhysicsVolume(true);
	SphereCollision->Mobility = EComponentMobility::Static;
	RootComponent = SphereCollision;

	ItemNotFoundSprite = CreateEditorOnlyDefaultSubobject<UBillboardComponent>(TEXT("ItemNotFoundSprite"));

	ItemFoundMesh = CreateEditorOnlyDefaultSubobject<UStaticMeshComponent>(TEXT("ItemFoundMesh"));

#if WITH_EDITORONLY_DATA
	if (!IsRunningCommandlet())
	{
		// Structure to hold one-time initialization
		struct FConstructorStatics
		{
			ConstructorHelpers::FObjectFinderOptional<UTexture2D> NavigationTextureObject;
			FName ID_ActorSprite;
			FText NAME_ActorSprite;
			ConstructorHelpers::FObjectFinderOptional<UTexture2D> ItemNotFoundSpriteObject;
			FConstructorStatics()
				: NavigationTextureObject(TEXT("/Engine/EditorResources/S_Actor"))
				, ID_ActorSprite(TEXT("Actor"))
				, NAME_ActorSprite(NSLOCTEXT("SpriteCategory", "Actor", "Actor"))
				, ItemNotFoundSpriteObject(TEXT("/Engine/EditorResources/Bad"))
			{
			}
		};
		static FConstructorStatics ConstructorStatics;

		if (ItemNotFoundSprite)
		{
			ItemNotFoundSprite->Sprite = ConstructorStatics.ItemNotFoundSpriteObject.Get();
			ItemNotFoundSprite->bHiddenInGame = true;
			ItemNotFoundSprite->SpriteInfo.Category = ConstructorStatics.ID_ActorSprite;
			ItemNotFoundSprite->SpriteInfo.DisplayName = ConstructorStatics.NAME_ActorSprite;
			ItemNotFoundSprite->SetUsingAbsoluteScale(true);
			ItemNotFoundSprite->SetupAttachment(SphereCollision);
			ItemNotFoundSprite->bIsScreenSizeScaled = true;
		}
	}
#endif // WITH_EDITORONLY_DATA

	// We don't have a proper default ItemKind so just show the not found sprite for now
	if (ItemNotFoundSprite)
	{
		ItemNotFoundSprite->SetVisibility(true);
	}
}

void AAGDroppedItemSpawner::BeginPlay()
{
	Super::BeginPlay();

	// Spawn the item!

	// Destroy itself once we are done
	Destroy();
}

#if WITH_EDITOR
void AAGDroppedItemSpawner::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
	const FName PropertyName = PropertyChangedEvent.Property ? PropertyChangedEvent.Property->GetFName() : NAME_None;

	if (PropertyName == NAME_ItemKind)
	{
		ValidateMeshDisplay();
	}

	MarkComponentsRenderStateDirty(); // force redisplay
	Super::PostEditChangeProperty(PropertyChangedEvent);
}

void AAGDroppedItemSpawner::PostEditUndo()
{
	Super::PostEditUndo();

	ValidateMeshDisplay();
}
#endif // WITH_EDITOR

void AAGDroppedItemSpawner::ValidateMeshDisplay()
{
	if (!GEditor || !ItemNotFoundSprite || !ItemFoundMesh)
	{
		return;
	}

	AAGGameState* GameState = GEditor->PlayWorld->GetGameState<AAGGameState>();
	if (!GameState || !GameState->AllItemData)
	{
		ItemNotFoundSprite->SetVisibility(true);
		ItemFoundMesh->SetVisibility(false);
	}

	FItemData* ItemData = GameState->AllItemData->FindRow<FItemData>(ItemKind, TEXT("AAGDroppedSpawner::ValidateMeshDisplay"), false);
	if (ItemData && ItemData->ItemMesh)
	{
		ItemNotFoundSprite->SetVisibility(false);
		ItemFoundMesh->SetStaticMesh(ItemData->ItemMesh);
		ItemFoundMesh->SetVisibility(true);
	}
	else
	{
		ItemNotFoundSprite->SetVisibility(true);
		ItemFoundMesh->SetVisibility(false);
	}
}

The problem with this is that there’s no gamestate, since this is in the editor, and GameState is NULL. Also, ValidateMeshDisplay isn’t called at the beginning of the editor session, so everything displays the sprite instead.

Basically, I want a preview of the actor before it spawns, but the appearance depends on data in a data sheet. Should I move the data sheet to be somewhere besides the game state, and if so, where? If I don’t need to move it, how do I edit the code to get the appearance?