added multi

UI/main_menu_panel.gd

@@ -0,0 +1,105 @@
+extends Control
+
+## The 2D UI rendered inside the main menu's world-space viewport
+## (XRToolsViewport2DIn3D). Lets the player pick John's scene, host a
+## multiplayer game, or join one by IP, driving scene switches + NetworkManager
+## directly.
+
+const JON_SCENE := "res://Scenes/JonScene.tscn"
+const MULTIPLAYER_SCENE := "res://Scenes/multiPlayer.tscn"
+
+var _ip := "127.0.0.1"
+
+@onready var _root_view: Control = %RootView
+@onready var _join_view: Control = %JoinView
+@onready var _ip_label: Label = %IPLabel
+@onready var _status: Label = %Status
+@onready var _keypad: GridContainer = %Keypad
+@onready var _john_btn: Button = %JohnButton
+@onready var _host_btn: Button = %HostButton
+@onready var _join_menu_btn: Button = %JoinMenuButton
+@onready var _join_btn: Button = %JoinButton
+@onready var _back_btn: Button = %BackButton
+
+
+func _ready() -> void:
+	if _bypass_menu_for_cmdline():
+		return
+	for child in _keypad.get_children():
+		if child is Button:
+			child.pressed.connect(_on_key.bind(child.text))
+	_john_btn.pressed.connect(_on_john_pressed)
+	_host_btn.pressed.connect(_on_host_pressed)
+	_join_menu_btn.pressed.connect(_show_join_view)
+	_join_btn.pressed.connect(_on_join_pressed)
+	_back_btn.pressed.connect(_show_root_view)
+	_show_root_view()
+	_refresh_ip()
+
+
+## --server / --join <ip> on the command line skip straight to the multiplayer
+## scene, same as the previously headless-tested main.tscn flow.
+func _bypass_menu_for_cmdline() -> bool:
+	var args := OS.get_cmdline_user_args()
+	if args.has("--server"):
+		NetworkManager.request_host()
+		get_tree().change_scene_to_file.call_deferred(MULTIPLAYER_SCENE)
+		return true
+	if args.has("--join"):
+		var idx := args.find("--join")
+		var addr := "127.0.0.1"
+		if idx + 1 < args.size():
+			addr = args[idx + 1]
+		NetworkManager.request_join(addr)
+		get_tree().change_scene_to_file.call_deferred(MULTIPLAYER_SCENE)
+		return true
+	return false
+
+
+func _show_root_view() -> void:
+	_root_view.visible = true
+	_join_view.visible = false
+
+
+func _show_join_view() -> void:
+	_root_view.visible = false
+	_join_view.visible = true
+
+
+func _on_key(key: String) -> void:
+	match key:
+		"DEL":
+			_ip = _ip.substr(0, max(0, _ip.length() - 1))
+		_:
+			if _ip.length() < 21:
+				_ip += key
+	_refresh_ip()
+
+
+func _refresh_ip() -> void:
+	_ip_label.text = _ip if not _ip.is_empty() else "_"
+
+
+func _on_john_pressed() -> void:
+	NetworkManager.leave()
+	get_tree().change_scene_to_file.call_deferred(JON_SCENE)
+
+
+func _on_host_pressed() -> void:
+	NetworkManager.request_host()
+	get_tree().change_scene_to_file.call_deferred(MULTIPLAYER_SCENE)
+
+
+func _on_join_pressed() -> void:
+	if _ip.is_empty():
+		set_status("Enter an IP first")
+		return
+	NetworkManager.request_join(_ip)
+	get_tree().change_scene_to_file.call_deferred(MULTIPLAYER_SCENE)
+
+
+## Called by network_manager (e.g. on connection_failed after a bounce back to
+## this menu) to show feedback.
+func set_status(text: String) -> void:
+	if _status:
+		_status.text = text