Put it all together - Friend list - (Unreal Engine module)

Last updated on March 24, 2025

Connect the UI to get friend list​

  1. Open the FriendsWidget_Starter class CPP file, navigate to the GetFriendList() function, and replace the current implementation with the code below. It will get the friend list using the FriendsSubsystem_Starter and then display it upon completion.

    void UFriendsWidget_Starter::GetFriendList()
    {
    	ensure(FriendsSubsystem);

    	Ws_Friends->SetWidgetState(EAccelByteWarsWidgetSwitcherState::Loading);

    	FriendsSubsystem->GetFriendList(
    		GetOwningPlayer(),
    		FOnGetFriendListComplete::CreateWeakLambda(this, [this](bool bWasSuccessful, TArray<UFriendData*> Friends, const FString& ErrorMessage)
    		{
    			Tv_Friends->ClearListItems();

    			if (bWasSuccessful) 
    			{
    				Tv_Friends->SetListItems(Friends);
    				Ws_Friends->SetWidgetState(Friends.IsEmpty() ?
    					EAccelByteWarsWidgetSwitcherState::Empty :
    					EAccelByteWarsWidgetSwitcherState::Not_Empty);
    			}
    			else
    			{
    				Ws_Friends->ErrorMessage = FText::FromString(ErrorMessage);
    				Ws_Friends->SetWidgetState(EAccelByteWarsWidgetSwitcherState::Error);
    			}
    		}
    	));
    }

  2. Add the code below to the NativeOnActivated(). It will bind the GetFriendList() function to the OnCachedFriendsDataUpdated, updating the displayed list as soon as the actual list changes.

    void UFriendsWidget_Starter::NativeOnActivated()
    {
    	Super::NativeOnActivated();

    	Btn_Back->OnClicked().AddUObject(this, &ThisClass::DeactivateWidget);

    	// Reset widgets.
    	Ws_Friends->SetWidgetState(EAccelByteWarsWidgetSwitcherState::Empty);
    	Tv_Friends->ClearListItems();

    	Tv_Friends->OnItemClicked().AddUObject(this, &ThisClass::OnFriendEntryClicked);
    	
    	FriendsSubsystem->BindOnCachedFriendsDataUpdated(GetOwningPlayer(), FOnCachedFriendsDataUpdated::CreateUObject(this, &ThisClass::GetFriendList));
    	GetFriendList();
    }

  3. In NativeOnDeactivated(), add the code below. Essentially, it will stop listening to the friend list changes upon the widget closing.

    void UFriendsWidget_Starter::NativeOnDeactivated()
    {
    	Btn_Back->OnClicked().Clear();

    	Tv_Friends->OnItemClicked().Clear();

    	FriendsSubsystem->UnbindOnCachedFriendsDataUpdated(GetOwningPlayer());

    	Super::NativeOnDeactivated();
    }

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