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

Development Programming & Scripting C++
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.

6

Coming here 4 years after because I found this post while looking for an answer.

The answer is:
Either end your event name with “Event” or use the metadata IsBindableEvent = "True". Prefeer using the metadata

example of ComboBox.h

	UPROPERTY(EditAnywhere, Category=Events, meta=( IsBindableEvent="True" ))
	FGenerateWidgetForObject OnGenerateWidgetEvent;