Inventory2/ui/MultiplayerMenu.cs

public partial class MultiplayerMenu : MarginContainer
{
	enum Status
	{
		Disconnected,
		ConnectionFailed,
		HostingFailed,
		Connecting,
		Connected,
		Hosting,
	}

	Status _status = Status.Disconnected;

	[Export] public Label StatusLabel { get; set; }

	[ExportGroup("When Disconnected")]
	[Export] public Container WhenDisconnected { get; set; }
	[Export] public LineEdit  AddressInput     { get; set; }
	[Export] public SpinBox   PortInput        { get; set; }
	[Export] public Button    ConnectButton    { get; set; }
	[Export] public Button    HostButton       { get; set; }

	[ExportGroup("When Server")]
	[Export] public Container WhenServer  { get; set; }
	[Export] public LineEdit  PortDisplay { get; set; }

	[ExportGroup("When Connected")]
	[Export] public Container WhenConnected    { get; set; }
	[Export] public Label     PlayersLabel     { get; set; }
	[Export] public Button    DisconnectButton { get; set; }

	public override void _Ready()
	{
		PortDisplay.AddThemeColorOverride("font_uneditable_color", PortDisplay.GetThemeColor("font_color"));

		Multiplayer.ConnectedToServer  += () => UpdateStatus(Status.Connected);
		Multiplayer.ConnectionFailed   += () => UpdateStatus(Status.ConnectionFailed);
		Multiplayer.ServerDisconnected += () => UpdateStatus(Status.Disconnected);

		Game.Instance.MultiplayerManager.PlayerJoined += _ => UpdatePlayerCount();
		Game.Instance.MultiplayerManager.PlayerLeft   += _ => UpdatePlayerCount();
	}

	void UpdateStatus(Status status)
	{
		_status = status;

		StatusLabel.Text = status switch {
			Status.Disconnected     => "Disconnected",
			Status.ConnectionFailed => "Connection failed!",
			Status.HostingFailed    => "Hosting failed!",
			Status.Connecting       => "Connecting ...",
			Status.Connected        => "Connected",
			Status.Hosting          => "Hosting",
			_ => throw new InvalidOperationException(),
		};
		StatusLabel.LabelSettings.FontColor = (status switch {
			Status.Disconnected     => Colors.DarkGray,
			Status.ConnectionFailed => Colors.Red,
			Status.HostingFailed    => Colors.Red,
			Status.Connecting       => Colors.Yellow,
			Status.Connected        => Colors.Green,
			Status.Hosting          => Colors.Green,
			_ => throw new InvalidOperationException(),
		}).Lerp(StatusLabel.GetThemeColor("font_color"), 0.5f);

		WhenDisconnected.Visible = status <  Status.Connecting;
		WhenServer.Visible       = status == Status.Hosting;
		WhenConnected.Visible    = status >= Status.Connecting;
		DisconnectButton.Text    = status == Status.Hosting ? "Close Server" : "Disconnect";

		UpdatePlayerCount();
	}

	void UpdatePlayerCount()
	{
		PlayersLabel.Text = _status switch {
			< Status.Connecting => "Singleplayer",
			  Status.Connecting => "??? Players",
			> Status.Connecting => ((Func<string>)(() => {
				var players = Game.Instance.MultiplayerManager.Players.GetChildCount();
				return $"{players} {(players != 1 ? "Players" : "Player")}";
			}))(),
		};
	}

	public void OnShowAddressToggled(bool toggledOn)
	{
		AddressInput.Secret = !toggledOn;
		AddressInput.VirtualKeyboardType = toggledOn
			? LineEdit.VirtualKeyboardTypeEnum.Default
			: LineEdit.VirtualKeyboardTypeEnum.Password;
	}

	public void OnConnectPressed()
	{
		var address = AddressInput.Text;
		if (address == "") address = AddressInput.PlaceholderText;
		var port = (ushort)RoundToInt(PortInput.Value);
		Game.Instance.MultiplayerManager.Connect(address, port);
		UpdateStatus(Status.Connecting);
	}

	public void OnHostPressed()
	{
		var port = (ushort)RoundToInt(PortInput.Value);
		if (Game.Instance.MultiplayerManager.CreateServer(port)) {
			PortDisplay.Text = port.ToString();
			UpdateStatus(Status.Hosting);
		} else
			UpdateStatus(Status.HostingFailed);
	}

	public void OnDisconnectPressed()
	{
		Game.Instance.MultiplayerManager.Disconnect();
		UpdateStatus(Status.Disconnected);
	}
}