Unreal Engine Module - Add a Friend - Put it all together

Last updated on January 13, 2024

Connecting UI with Get Received Friend Requests implementation​

  1. Open the FriendRequestsWidget_Starter class CPP file, navigate to the GetFriendRequestList() function, and replace the current implementation with the following code. It will get the received friend request list using the FriendsSubsystem_Starter subsystem and then display it upon completion.

    void UFriendRequestsWidget_Starter::GetFriendRequestList()
    {
        ensure(FriendsSubsystem);

        Ws_FriendRequests->SetWidgetState(EAccelByteWarsWidgetSwitcherState::Loading);

        FriendsSubsystem->GetInboundFriendRequestList(
            GetOwningPlayer(),
            FOnGetInboundFriendRequestListComplete::CreateWeakLambda(this, [this](bool bWasSuccessful, TArray<UFriendData*> FriendRequests, const   FString& ErrorMessage)
            {
                Lv_FriendRequests->SetUserFocus(GetOwningPlayer());
                Lv_FriendRequests->ClearListItems();

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

  2. Next, add the highlighted code to the NativeOnActivated(). It will bind the GetFriendRequestList function to the OnCachedFriendsDataUpdated, updating the displayed list as soon as the actual list changes.

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

        ...

        FriendsSubsystem->BindOnCachedFriendsDataUpdated(GetOwningPlayer(), FOnCachedFriendsDataUpdated::CreateUObject(this, &ThisClass::GetFriendRequestList));
        GetFriendRequestList();
    }

  3. Finally, in the NativeOnDeactivated() add the following code. Basically, it will stop listening to the received friend request list changes upon the widget is closed.

    void UFriendRequestsWidget_Starter::NativeOnDeactivated()
    {
        FriendsSubsystem->UnbindOnCachedFriendsDataUpdated(GetOwningPlayer());

        Super::NativeOnDeactivated();
    }

  4. Congratulations! You have connected the widget to display the received friend request list.

Connecting UI with Get Sent Friend Requests implementation​

  1. Open the SentFriendRequestsWidget_Starter class CPP file, navigate to the GetSentFriendRequestList() function, and replace the current implementation with the following code. It will get the sent friend request list using the FriendsSubsystem_Starter subsystem and then display it upon completion.

    void USentFriendRequestsWidget_Starter::GetSentFriendRequestList()
    {
        ensure(FriendsSubsystem);

        Ws_FriendRequests->SetWidgetState(EAccelByteWarsWidgetSwitcherState::Loading);

        FriendsSubsystem->GetOutboundFriendRequestList(
            GetOwningPlayer(),
            FOnGetOutboundFriendRequestListComplete::CreateWeakLambda(this, [this](bool bWasSuccessful, TArray<UFriendData*> FriendRequests, const FString& ErrorMessage)
            {
                Lv_FriendRequests->SetUserFocus(GetOwningPlayer());
                Lv_FriendRequests->ClearListItems();

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

  2. Next, add the following code to the NativeOnActivated(). It will bind the GetSentFriendRequestList function to the OnCachedFriendsDataUpdated, updating the displayed list as soon as the actual list changes.

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

        ...

        FriendsSubsystem->BindOnCachedFriendsDataUpdated(GetOwningPlayer(), FOnCachedFriendsDataUpdated::CreateUObject(this, &ThisClass::GetSentFriendRequestList));
        GetSentFriendRequestList();
    }

  3. Finally, in the NativeOnDeactivated() add the following code. Basically, it will stop listening to the sent friend request list changes upon the widget is closed.

    void USentFriendRequestsWidget_Starter::NativeOnDeactivated()
    {
        FriendsSubsystem->UnbindOnCachedFriendsDataUpdated(GetOwningPlayer());

        Super::NativeOnDeactivated();
    }

  4. Congratulations! You have connected the widget to display the sent friend request list.

Connecting UI with Accept, Reject, and Cancel Friend Requests implementation​

  1. Let's start with accepting friend request first. Open the FriendWidgetEntry_Starter class CPP file, navigate to the OnAcceptButtonClicked function, and replace the current implementation with the following code.

    void UFriendWidgetEntry_Starter::OnAcceptButtonClicked()
    {
        ensure(CachedFriendData);
        ensure(FriendsSubsystem);

        FriendsSubsystem->AcceptFriendRequest(GetOwningPlayer(), CachedFriendData->UserId);
    }

  2. Still in the same file, navigate to the OnRejectButtonClicked function, and replace the current implementation with the following code.

    void UFriendWidgetEntry_Starter::OnRejectButtonClicked()
    {
        ensure(CachedFriendData);
        ensure(FriendsSubsystem);

        FriendsSubsystem->RejectFriendRequest(GetOwningPlayer(), CachedFriendData->UserId);
    }

  3. Finally, navigate to the OnCancelButtonClicked function, and replace the current implementation with the following code to cancel the friend requests.

    void UFriendWidgetEntry_Starter::OnCancelButtonClicked()
    {
        ensure(CachedFriendData);
        ensure(FriendsSubsystem);

        // Cancel friend request is the same as removing a friend.
        FriendsSubsystem->CancelFriendRequest(GetOwningPlayer(), CachedFriendData->UserId);
    }

  4. Congratulations! You have connected the widget to perform accept, reject, and cancel the friend request.

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