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Last updated on May 30, 2024

Connect the UI to search player and send friend request

1. Open the FindFriendsWidget_Starter class CPP file. There, you will find a function called NativeOnActivated(), which will be called upon the widget opening. In that function, you have already stored a reference to FriendsSubsystem_Starter, so you can use it to call friends functionalities you created previously.

2. In the FindFriendsWidget_Starter class CPP file, navigate to the OnSearchBarCommitted() function, and replace the current implementation with the code below. It will find a potential friend using the FriendsSubsystem_Starter subsystem. Once complete, it will show the result.

   void UFindFriendsWidget_Starter::OnSearchBarCommitted(const FText& Text, ETextCommit::Type CommitMethod)
   {
       if (CommitMethod != ETextCommit::Type::OnEnter || Text.IsEmpty())
       {
           return;
       }
   
       ensure(FriendsSubsystem);
   
       Ws_FindFriends->SetWidgetState(EAccelByteWarsWidgetSwitcherState::Loading);
   
       FriendsSubsystem->FindFriend(
           GetOwningPlayer(),
           Text.ToString(), 
           FOnFindFriendComplete::CreateWeakLambda(this, [this](bool bWasSuccessful, UFriendData* FriendData, const FString& ErrorMessage)
           {
               Lv_FindFriends->SetUserFocus(GetOwningPlayer());
               Lv_FindFriends->ClearListItems();
   
               if (bWasSuccessful)
               {
                   // Reset the status to be "searched", because the data is retrieved from find friend result.
                   FriendData->Status = EFriendStatus::Searched;
                   Lv_FindFriends->AddItem(FriendData);
                   Lv_FindFriends->RequestRefresh();
                   Ws_FindFriends->SetWidgetState(EAccelByteWarsWidgetSwitcherState::Not_Empty);
               }
               else
               {
                   Ws_FindFriends->ErrorMessage = FText::FromString(ErrorMessage);
                   Ws_FindFriends->SetWidgetState(EAccelByteWarsWidgetSwitcherState::Error);
               }
           }
       ));
   }

3. Open the FriendWidgetEntry_Starter class CPP file, navigate to the OnInviteButtonClicked(), and replace the current implementation with the code below. It will send a friend invitation request using the FriendsSubsystem_Starter subsystem.

   void UFriendWidgetEntry_Starter::OnInviteButtonClicked()
   {
       ensure(CachedFriendData);
       ensure(FriendsSubsystem);
   
       FriendsSubsystem->SendFriendRequest(
           GetOwningPlayer(), 
           CachedFriendData->UserId, 
           FOnSendFriendRequestComplete::CreateWeakLambda(this, [this](bool bWasSuccessful, UFriendData* FriendData, const FString& ErrorMessage) 
           {
               if (bWasSuccessful) 
               {
                   // Since the invitation is already sent, refresh the entry data to show that the friend cannot be invited again.
                   CachedFriendData->bCannotBeInvited = FriendData->bCannotBeInvited;
                   CachedFriendData->ReasonCannotBeInvited = FriendData->ReasonCannotBeInvited;
                   NativeOnListItemObjectSet(CachedFriendData);
               }
           }
       ));
   }

4. Compile your project and make sure there are no errors.

Resources

• The files used in this tutorial section are available in the Unreal Byte Wars GitHub repository.
  • AccelByteWars/Source/AccelByteWars/TutorialModules/Social/FriendsEssentials/UI/FindFriendsWidget_Starter.cpp
  • AccelByteWars/Source/AccelByteWars/TutorialModules/Social/FriendsEssentials/UI/FriendWidgetEntry_Starter.cpp