C++ Cant' modify struct Component in details/viewport panel

anonymous_user_5fd7f781 · May 15, 2018, 9:26am

Hey guys,

I’m trying to do something really simple, I have a struct with some component that I create in my constructor and attach it to the root. No problem so far, everything is created and moved in the origin of my Root. But When I go into my blueprint to move those component manually, I can’t access them.



USTRUCT(BlueprintType)
struct XROAD_API FXRoadVehicleSeat
{
    GENERATED_USTRUCT_BODY()

public:

    FXRoadVehicleSeat() {}

    FXRoadVehicleSeat(UBoxComponent* LocalDoorInteractionCollision,
        UArrowComponent* LocalExitVehicleArrow,
        EDoorPosition LocalDoorPosition,
        FName LocalSocketName,
        AXRoadPedestrian * LocalPedestrianOnTheSeat = NULL,
        bool bLocalIsDriverSeat = false)
    {
        DoorInteractionCollision = LocalDoorInteractionCollision;
        ExitVehicleArrow = LocalExitVehicleArrow;
        DoorPosition = LocalDoorPosition;
        SocketName = LocalSocketName;
        PedestrianOnTheSeat = LocalPedestrianOnTheSeat;
        bIsDriverSeat = bLocalIsDriverSeat;
    }

public:

    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, meta = (AllowPrivateAccess = "true"), Category = "XROAD|Vehicle|Seats")
    UBoxComponent * DoorInteractionCollision;

    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, meta = (AllowPrivateAccess = "true"), Category = "XROAD|Vehicle|Seats")
    UArrowComponent * ExitVehicleArrow;

    UPROPERTY(EditAnywhere, meta = (AllowPrivateAccess = "true"), Category = "XROAD|Vehicle|Seats")
    EDoorPosition DoorPosition;

    UPROPERTY(EditAnywhere, meta = (AllowPrivateAccess = "true"), Category = "XROAD|Vehicle|Seats")
    FName SocketName;

    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = "XROAD|Vehicle|Doors")
    AXRoadPedestrian * PedestrianOnTheSeat;

    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = "XROAD|Vehicle|Seats")
    bool bIsDriverSeat;
};

This is my stucture containing my two component I want to modify.



    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = "XROAD|Vehicle|Interaction")
    TArray<FXRoadVehicleSeat> VehicleSeats;

Here is my declaration of FXRoadVehicleSeat which is my structure containing my components.


    NumberOfSeats = 4;

    for (int i = 0; i < NumberOfSeats; ++i)
    {
        // Door Collision
        UBoxComponent * Collision = CreateDefaultSubobject<UBoxComponent>(FName(*FString(GETENUMSTRING("EDoorPosition", (EDoorPosition)i) + "_Collision")));
        Collision->SetupAttachment(RootComponent);

        // Exit Arrow for the pedestrian
        UArrowComponent * ExitVehicleArrow = CreateDefaultSubobject<UArrowComponent>(*FString("ExitArrow_" + FString::FromInt(i)));
        ExitVehicleArrow->SetupAttachment(Collision);

        VehicleSeats.Add(FXRoadVehicleSeat(Collision,
            ExitVehicleArrow,
            (EDoorPosition)i,
            FName(*(GETENUMSTRING("EDoorPosition", (EDoorPosition)i))),
            NULL));
    }

And finally my constructor where I initialize every Component.

Here is the result of this code. I still can’t access them, but if I’m putting them outside a struct It’s working as intended, I can modify them manually. I think I am missing something or it’s just not possible, I put VisibleAnywhere or EditAnywhere for my component and even BlueprintReadWrite but I still can’t have any control over them in my Viewport or details panel.

Any feedback is welcome! Thanks!

SolidGasStudios · May 17, 2018, 1:34pm

Try change USTRUCT(BlueprintType) to USTRUCT(Blueprintable)

honya15 · May 17, 2018, 5:07pm

change “visibleanywhere” to “editanywhere”

anonymous_user_5fd7f781 · May 18, 2018, 7:59am

It does not seems to change anything, I did put USTRUCT(Blueprintable) as a property specifier and I still got the same result. Can you explain me a little more what this specifier do, I can’t seem to find any Documentation about it except some Korean site.


USTRUCT(Blueprintable)
struct XROAD_API FXRoadVehicleSeat
{
    GENERATED_BODY()

public:

    FXRoadVehicleSeat() {}

    FXRoadVehicleSeat(UBoxComponent* LocalDoorInteractionCollision,
        UArrowComponent* LocalExitVehicleArrow,
        EDoorPosition LocalDoorPosition,
        FName LocalSocketName,
        AXRoadPedestrian * LocalPedestrianOnTheSeat = NULL,
        bool bLocalIsDriverSeat = false)
    {
        DoorInteractionCollision = LocalDoorInteractionCollision;
        ExitVehicleArrow = LocalExitVehicleArrow;
        DoorPosition = LocalDoorPosition;
        SocketName = LocalSocketName;
        PedestrianOnTheSeat = LocalPedestrianOnTheSeat;
        bIsDriverSeat = bLocalIsDriverSeat;
    }

public:

    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, meta = (AllowPrivateAccess = "true"), Category = "XROAD|Vehicle|Seats")
    UBoxComponent * DoorInteractionCollision;

    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, meta = (AllowPrivateAccess = "true"), Category = "XROAD|Vehicle|Seats")
    UArrowComponent * ExitVehicleArrow;

    UPROPERTY(EditAnywhere, meta = (AllowPrivateAccess = "true"), Category = "XROAD|Vehicle|Seats")
    EDoorPosition DoorPosition;

    UPROPERTY(EditAnywhere, meta = (AllowPrivateAccess = "true"), Category = "XROAD|Vehicle|Seats")
    FName SocketName;

    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = "XROAD|Vehicle|Doors")
    AXRoadPedestrian * PedestrianOnTheSeat;

    UPROPERTY(BlueprintReadWrite, EditAnywhere, Category = "XROAD|Vehicle|Seats")
    bool bIsDriverSeat;
};

As I mentioned in my first post, I already tried this. Furthermore, As this post: EditAnywhere vs VisibleAnywhere - Programming & Scripting - Epic Developer Community Forums explain it, the best way to handle an UObject pointer is to put a VisibleAnywhere.

Thanks,

honya15 · May 18, 2018, 11:22am

BlueprintType means blueprints can use this struct. it will be visible for scripts. Blueprintable means blueprints can inherit from this object.

Zeblote · May 21, 2018, 7:56pm

If you want components to be accessible like that, you have to make UProperties for each of them on the actor - having a struct inbetween isn’t going to work.

anonymous_user_5fd7f781 · May 22, 2018, 7:25am

Ok thanks, I was expecting it to be like this. I really hope EPIC can make this possible in the future, It really help refactoring and add more visibility in my code but oh well guess we can’t have everything .

One last question, Is it possible to have a TARRAY of my components in my actor and have them accessible in my blueprint? Like instead of declararing each component one by one on my actor like this:



    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, Category = "XROAD|Vehicle|Effects")
    UParticleSystemComponent *VehicleSkidsParticleFrontLeft;

    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, Category = "XROAD|Vehicle|Effects")
    UParticleSystemComponent *VehicleSkidsParticleFrontRight;

    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, Category = "XROAD|Vehicle|Effects")
    UParticleSystemComponent *VehicleSkidsParticleRearLeft;

    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, Category = "XROAD|Vehicle|Effects")
    UParticleSystemComponent *VehicleSkidsParticleRearRight

Having a TARRAY like this:


    UPROPERTY(BlueprintReadWrite, VisibleAnywhere, Category = "XROAD|Vehicle|Effects")
    TArray<UParticleSystemComponent*> VehicleSkidsParticle;

And still have access to them.

Thanks in advance,

Zeblote · May 22, 2018, 12:16pm

Haven’t tried that before. If it’s not working, probably not.

SolidGasStudios · May 23, 2018, 6:08am

You might instead want to create an exposed TArray<UParticleSystem*> and then have a private TArray<UParticleSystemComponents*> that you create and register in a loop during OnConstruction.

anonymous_user_5fd7f781 · May 24, 2018, 2:22pm

Yeah in the end i’m doing everything through code, it wasn’t my ideal way of doing things because I wanted to have full access to those component in my viewport but I have no choice.

Thanks for the help guys.