How I can do drag and drop in C ++?

Development Programming & Scripting
7

BatallaUserWidget.h

class BATALLA_API UBatallaUserWidget : public UUserWidget { GENERATED_BODY()

public:
// UFUNCTION(BlueprintNativeEvent, BlueprintCosmetic, Category = “Drag and Drop”)
void OnDragDetected(FGeometry MyGeometry, const FPointerEvent& PointerEvent, UDragDropOperation*& Operation);

BatallaUserWidget.cpp

void UBatallaUserWidget::OnDragDetected(FGeometry MyGeometry, const FPointerEvent& PointerEvent, UDragDropOperation*& Operation){ 
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT(" inicia drag"));

}

COMPILE OK!!! , but nothing happens.You never gets the message.