Reworking delegates into BPs

Development Programming & Scripting C++
1

I would like to rework the following FDelegateHandles into my BP only project, can I even do it for the following calls:

LoginChangedHandle = FCoreDelegates::OnUserLoginChangedEvent.AddUObject(this, &UGenMobileGameInstance::OnLoginChanged);
EnteringForegroundHandle = FCoreDelegates::ApplicationHasEnteredForegroundDelegate.AddUObject(this, &UGenMobileGameInstance::OnEnteringForeground);
EnteringBackgroundHandle = FCoreDelegates::ApplicationWillEnterBackgroundDelegate.AddUObject(this, &UGenMobileGameInstance::OnEnteringBackground);
ViewportHandle = FViewport::ViewportResizedEvent.AddUObject(this, &UGenMobileGameInstance::OnViewportResize_Internal);

I really just want to access these four callbacks in any way… if there are any hacky ways to do this that’d work too.

Thanks in advance.

2

No way to do this? I think the viewport resize callback can’t be done in BP and has to be a tick event.

If there is no way to get callbacks for enteringforeground and enteringbackground (I think I won’t need LoginChanged after all) - how does UE handle this by default? Does one have to think about this when developing for mobile?

Thanks.

3

“BP only project” is not a good idea. In my opinion you should never create such a project, only C++ ones even if you do 99% of the work in blueprint, at least you can be saved by some C++ when needed.

4

You can use UApplicationLifecycleComponent for ApplicationHasEnteredForegroundDelegate and ApplicationWillEnterBackgroundDelegate. Not sure about the other two there may be existing BP equivalents already, if not you can still write your own.

5

Ah nice! Thanks a lot!

@eyoli And yes, I had my project as a C++ project and came across compile issues I couldn’t work around… wasn’t a big deal to go to BPs instead as my project is small. I was also wanting to be able to deploy easier to mobile. I guess now if I have to go back to C++ it’ll be an easier conversion (actually c++ to BP is a pain in the bum generally speaking), we’ll see if I need to. My C++ skills aren’t super sharp either.