React to Client changes and show them in Lobby.razor.

I tested this on Multiplayer and realized pretty much everything is broken and I haven't been thinking about networking enough.
Will start fixing tomorrow.

code/NetworkManager.cs

@@ -1,3 +1,5 @@
+using System.Collections.Immutable;
+
 namespace LuckerParty;
 
 /// <summary>
@@ -10,11 +12,15 @@ public sealed class NetworkManager : Component, Component.INetworkListener
 	/// </summary>
 	private readonly Dictionary<Connection, GameObject> _clientMap = new();
 
+	private readonly List<Client> _clients = new();
+
 	/// <summary>
 	///     A GameObject used for organizational grouping of Clients
 	/// </summary>
 	private GameObject _clientGroup;
 
+	public ImmutableList<Client> Clients => _clients.ToImmutableList();
+
 	public void OnActive( Connection channel )
 	{
 		// Set up the Client GameObject
@@ -25,6 +31,9 @@ public sealed class NetworkManager : Component, Component.INetworkListener
 
 		// Spawn it on remote clients
 		gameObject.NetworkSpawn( channel );
+
+		_clients.Add( client );
+		IClientEvent.Post( e => e.OnConnected( client ) );
 	}
 
 	public void OnDisconnected( Connection channel )
@@ -35,8 +44,12 @@ public sealed class NetworkManager : Component, Component.INetworkListener
 			return;
 		}
 
+		var client = clientGameObject.GetComponent<Client>();
+		IClientEvent.Post( e => e.OnDisconnected( client ) );
+
 		clientGameObject.Destroy();
 		_clientMap.Remove( channel );
+		_clients.Remove( client );
 	}
 
 	protected override void OnAwake()
@@ -48,4 +61,13 @@ public sealed class NetworkManager : Component, Component.INetworkListener
 	{
 		_clientGroup.Destroy();
 	}
+
+	public interface IClientEvent : ISceneEvent<IClientEvent>
+	{
+		void OnConnected( Client client )
+		{
+		}
+
+		void OnDisconnected( Client client ) { }
+	}
 }

code/UI/Lobby.razor

@@ -1,20 +1,49 @@
 @namespace LuckerParty.UI
-@using System
 @inherits PanelComponent
+@using System
+@using System.Collections.Immutable
+@implements NetworkManager.IClientEvent
 
 <root>
 	<div class="title">This is the Lobby</div>
+	@foreach ( var client in _clients )
+	{
+		<div>@client.Name</div>
+	}
 </root>
 
 @code
 {
-	public List<Client> Clients { get; set; }
+	private ImmutableList<Client> _clients;
+	private NetworkManager _networkManager;
+
+	protected override void OnStart()
+	{
+		base.OnStart();
+		_networkManager = Scene.GetComponentInChildren<NetworkManager>();
+		UpdateClients();
+	}
+
+	void NetworkManager.IClientEvent.OnConnected( Client client )
+	{
+		UpdateClients();
+	}
+
+	void NetworkManager.IClientEvent.OnDisconnected( Client client )
+	{
+		UpdateClients();
+	}
+
+	private void UpdateClients()
+	{
+		_clients = _networkManager.Clients.Sort( ( clientA, clientB ) => DateTimeOffset.Compare( clientA.ConnectionTime, clientB.ConnectionTime ) );
+	}
 
 	/// <summary>
 	///     the hash determines if the system should be rebuilt. If it changes, it will be rebuilt
 	/// </summary>
 	protected override int BuildHash()
 	{
-		return HashCode.Combine( Clients );
+		return HashCode.Combine( _clients );
 	}
 }