Functions Reference

Complete reference of the graphs inside BPC_PartyManager, grouped by what they do. Use this page to find the right function before modifying party behavior; in most cases the logic you want to change already exists here.

Graph Overview

The component has two event graphs:

• EventGraph: Begin Play initialization (branches on Party Manager Type: Menu vs Game) and the BPI_PartyManagmentInterface event implementations (PMI_CreateMatchHUD, PMI_PartySpotCharClicked).
• SIK Bindings: binds all Steam Integration Kit delegates on startup. From SIK_MatchmakingSubsystem: On Lobby Created, On Lobby Enter, On Lobby Data Update, On Lobby Chat Msg, On Lobby Chat Update, On Lobby Invite, On Lobby Game Created. From SIK_FriendsSubsystem: On Game Lobby Join Requested. Each delegate routes into the matching Handle... function below.

SIK Delegate Handlers

These functions are the entry points for everything Steam tells the game.

Function	Called when	What it does
HandleOnLobbyCreated	Local player's Create Lobby succeeds	Stores the Lobby ID in the GameInstance, writes initial lobby data (party size, game mode, map, joinability) from saved preferences.
HandleOnLobbyEnter	Local player enters any lobby (own or joined)	Sets up the local member: writes member lobby data (skin, member index), initializes the party menu UI and avatars.
HandleOnLobbyDataUpdate	Any lobby or member data changes	The main "reactor". Refreshes avatars, skins, ready states, match settings display, and checks the game server state to trigger joining a started server.
HandleOnLobbyChatMsg	A chat message arrives	Parses player/system messages and routes them to the text chat widget with the right notification sound.
HandleOnLobbyChatUpdate	A member joins/leaves/disconnects	Triggers Lobby Member Count Check and Handle Leaving Player logic, sends system messages.
HandleOnLobbyInvite	A Steam party invite arrives	Shows the WB_LobbyInvite notification with the invite-received sound.
HandleOnGameLobbyJoinRequested	Player accepts an invite / joins via Steam overlay	Joins the requested lobby (leaving the current one first if needed).

Party Lifecycle (Macros)

Macro	What it does
Create SPM Party	Creates a Steam lobby using saved settings (last party size, game mode, map from SG_PlayerData / cloud data), writes all initial lobby data keys, sets joinability and Game Server State = NoServer, stores the Lobby ID in the GameInstance.
Join SPM Party	Joins an existing lobby by ID.
Find LFP Parties	Searches for public "Looking for Party" lobbies matching preferences (used by the social menu LFP tab).
Init Game Server	Host only. Resolves the selected map from DA_PM_Settings, sets Game Server State = Starting, writes the host's Steam ID as Lobby Game Server, resets ready statuses and opens the level as listen server.
Leave Game Server	Leaves the running game server and returns to the party menu.
TimeOutDisbandAttempt	Failsafe: disbands/aborts a game start if the server doesn't come up in time.
Delay Joining Clients	Staggers client connections so they don't all hit the fresh listen server on the same frame.

Game Server / Session Functions

Function	What it does
Join Game Server (if available)	Reads the Lobby Game Server (host Steam ID) from lobby data and connects with open steam.<id64> console travel. Called on clients when Game Server State becomes Live/Starting.
Check if GameServer	Determines whether the current context is the game server.
Reset GameServer	Clears game server lobby data back to NoServer (used after failure or shutdown).
Handle Staying as Party After GameServer	After a match ends, keeps the party together when returning to the menu.
PIE Mode Gameserver Init	Special path so the flow can be partially tested in PIE where Steam is unavailable.

Ready Check

Function	What it does
PartyReadyCheck	Toggles the local player's ready status in lobby member data, counts ready members across the lobby, broadcasts OnPartyMemberReadyStatusChange and OnPartyReadyCheckUpdate. When all members are ready, the host runs Start Game Server (→ Init Game Server).

Party Members & Avatars

Function	What it does
Setup PartyMenu Level	Initializes the menu level: finds all BP_PartySpot actors, spawns the local avatar, creates WB_PartyMenu.
SetMemberAvatar	Spawns/updates the avatar character on a party spot for a given member and applies their skin via BPC_CharacterCustomization.
Character Data Update	Reapplies skin/variation when a member's customization lobby data changes.
FindLastJoinedMemberIndex	Determines the next free spot index for a newly joined member.
Lobby Member Count Check	Compares current vs previous member count, fires OnPartyMemberCountChange, and triggers join/leave handling.
Handle Leaving Player	Cleans up after a member leaves: resets their pedestal and avatar, frees their member index, sends a system chat message, and re-checks host crown ownership.
Check Host Crown Ownership	Updates which spot shows the host crown after owner changes (Steam auto-migrates lobby ownership).
Focus Local Main Spot	Points the camera/focus at the local player's spot.
Kick Player	Host removes a member from the party (via lobby data so the kicked client leaves itself).
Validate Skin Type / Reset Skin Type	Sanity checks a member's skin key against All Characters in the settings data; falls back to default if the skin doesn't exist in this project.

UI & Widget Management

Function	What it does
Game Initialization Widget	Shows/hides WB_GameInitialization (the "match is starting" overlay).
Update Lobby Member Widget	Refreshes a member's entry in the party menu widget.
Update Play Box Settings	Refreshes the match settings display (party size / game mode / map) in WB_PartyMenu.
Handle Play Box Visibility	Shows the play/ready box only to the relevant players.
Handle Escape Menu Widget	Creates/toggles WB_EscapeMenu.
Handle Settings Menu Widget	Creates/toggles WB_SettingsMenu.
Handle OnKeyDown Escape Button / Set On Key Down State	Escape key routing so Escape opens/closes the correct menu depending on state.
Handle CloudStorage Notification	Shows a warning notification when Steam Cloud is unavailable/disabled.
Handle Player Controller	Input mode / controller setup helper (UI vs game input).

Chat

Function	What it does
Handle Chat Message	Sends a player chat message to the lobby.
SendSystemMessage	Sends a formatted system message (member joined/left, host changed, etc.) into the lobby chat.

Event Dispatchers

Bind to these from your own widgets/actors:

Dispatcher	Fired when
OnPartySpotIconClicked	A party spot's icon widget is clicked (e.g. open invite/profile menu for that spot).
OnPartySpotIconHovered / OnPartySpotIconUnHovered	Spot icon hover state changes (pedestal highlight).
OnPartySpotCharClicked	A spot's character avatar is clicked.
OnPartyReadyCheckUpdate	The overall ready count changes (used to update the ready button / counter UI).
OnPartyMemberReadyStatusChange	A single member's ready status changes.
OnPartyMemberCountChange	A member joins or leaves the party.
OnMatchmakingStateMessage	Matchmaking status text should be shown.

Key Variables

Variable	Type	Purpose
Party Manager Type	E_ComponentType	Menu / Game behavior switch (see Party Manager).
Settings Data	PM_SettingsData	The central settings data asset.
Menu Avatar Class	class	Character class spawned on party spots.
AllSpots	BP_PartySpot array	The 4 spot actors found in the menu level.
Main Spot Avatar	object	The local player's spawned avatar.
WB Party Menu / Escape Widget / Settings Menu Widget / Match Widget / Initialization Widget	object	Cached widget references.
Current Lobby Members Count	int	Last known member count (for join/leave detection).
MemberIndexKeys	string array	Per-spot member index keys used in lobby member data.
isGameServer?	bool	True when this instance is hosting the game server.
On Key Down Handling / InFocus?	bool	Escape key / focus state management.