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How to create a new custom delegate use for get a return value in blueprint just like FGetWidget?

Development Discussion C++ Gameplay Programming
#1

Hi,

I’m creating a search box widget, and I want to make the user can bind a blueprint function with a match rule to check the typed text.

So I should create a delegate with return value to the user can bind a customize blueprint function.


//I defined the delegate.

DECLARE_DYNAMIC_DELEGATE_RetVal_TwoParams(bool, FOnMatchTypedText, const FString&, TypedText, const FString&, Suggestion);

//And create a variable with the delegate.

UPROPERTY(EditAnywhere, Category = Events)
        FOnMatchTypedText    OnMatchTypedText;

But it can’t bind any function in the blueprint.

How do I create a custom delegate with return value like FGetWidget?

#2

Good morning,

I think your are missing the BlueprintAssignable flag like in OnActorBeginOverlap



UPROPERTY(BlueprintAssignable, Category="Collision")
FActorBeginOverlapSignature OnActorBeginOverlap;
#3

I tried it, but if I used it, I’ll get an error like BlueprintAssignable must use for multicast delegate.

#4

That’s the thing. If you want to be able to use the delegate like this in Blueprint it has to be multicast.

#5

I know, but the multicast delegate can’t return a value for me.

I want to get a return value from the delegate.

Like MenuAnchor’s OnGenerateContent delegate.