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

Last updated on October 24, 2024

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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