Add direct-connect multiplayer foundation

ui/network/join_game_page.gd

@@ -0,0 +1,175 @@
+class_name JoinGamePage
+extends Control
+
+signal join_requested(endpoint: String)
+signal back_requested
+
+@onready var _address: LineEdit = %Address
+@onready var _join_button: BubbleButton = %JoinButton
+@onready var _cancel_button: BubbleButton = %CancelButton
+@onready var _back_button: BubbleButton = %BackButton
+@onready var _open_close_button: BubbleButton = %OpenCloseButton
+@onready var _status: Label = %Status
+@onready var _session_summary: Label = %SessionSummary
+
+var _network_session: NetworkSession
+var _saved_servers: SavedServerStore
+var _gameplay_context: bool = false
+
+
+func _ready() -> void:
+	_join_button.pressed.connect(_on_join_pressed)
+	_cancel_button.pressed.connect(_on_cancel_pressed)
+	_back_button.pressed.connect(_on_back_pressed)
+	_open_close_button.pressed.connect(_on_open_close_pressed)
+	_address.text_submitted.connect(_on_address_submitted)
+	hide()
+
+
+func setup(
+	network_session: NetworkSession,
+	saved_servers: SavedServerStore,
+	gameplay_context: bool,
+) -> void:
+	_network_session = network_session
+	_saved_servers = saved_servers
+	_gameplay_context = gameplay_context
+	if not _network_session.state_changed.is_connected(_on_state_changed):
+		_network_session.state_changed.connect(_on_state_changed)
+	if not _network_session.status_message_changed.is_connected(
+		_on_status_message_changed
+	):
+		_network_session.status_message_changed.connect(
+			_on_status_message_changed
+		)
+	if not _network_session.connection_error.is_connected(
+		_on_connection_error
+	):
+		_network_session.connection_error.connect(_on_connection_error)
+	if not _network_session.peer_count_changed.is_connected(
+		_on_peer_count_changed
+	):
+		_network_session.peer_count_changed.connect(_on_peer_count_changed)
+	_refresh()
+
+
+func open_page(preserved_endpoint: String = "") -> void:
+	if not preserved_endpoint.is_empty():
+		_address.text = preserved_endpoint
+	elif _address.text.is_empty():
+		_address.text = "127.0.0.1:7777"
+	show()
+	_refresh()
+	_address.grab_focus()
+	_address.select_all()
+
+
+func close_page() -> void:
+	hide()
+	get_viewport().gui_release_focus()
+
+
+func get_endpoint_text() -> String:
+	return _address.text
+
+
+func set_status(message: String) -> void:
+	_status.text = message
+
+
+func _on_join_pressed() -> void:
+	_request_join()
+
+
+func _on_address_submitted(_value: String) -> void:
+	_request_join()
+
+
+func _request_join() -> void:
+	if _network_session.state in [
+		NetworkSession.State.CONNECTION_FAILED,
+		NetworkSession.State.SERVER_LOST,
+	]:
+		_network_session.reset_failure()
+	var endpoint: ConnectionEndpoint = EndpointParser.parse(_address.text)
+	if not endpoint.is_valid():
+		_status.text = endpoint.error_message
+		return
+	_address.text = endpoint.normalized_display
+	join_requested.emit(endpoint.normalized_display)
+
+
+func _on_cancel_pressed() -> void:
+	if _network_session != null:
+		_network_session.cancel_connection()
+	_refresh()
+
+
+func _on_back_pressed() -> void:
+	if (
+		_network_session != null
+		and _network_session.state in [
+			NetworkSession.State.CONNECTING,
+			NetworkSession.State.AUTHENTICATING,
+		]
+	):
+		_network_session.cancel_connection()
+	back_requested.emit()
+
+
+func _on_open_close_pressed() -> void:
+	if _network_session == null or not _network_session.is_host():
+		return
+	_network_session.set_host_open(not _network_session.is_open_host())
+	_refresh()
+
+
+func _on_state_changed(_state: NetworkSession.State) -> void:
+	_refresh()
+
+
+func _on_status_message_changed(message: String) -> void:
+	_status.text = message
+	_refresh()
+
+
+func _on_connection_error(message: String) -> void:
+	_status.text = message
+	_refresh()
+
+
+func _on_peer_count_changed(player_count: int, max_players: int) -> void:
+	_session_summary.text = "%d / %d players" % [
+		player_count,
+		max_players,
+	]
+
+
+func _refresh() -> void:
+	if not is_node_ready() or _network_session == null:
+		return
+	var connecting: bool = _network_session.state in [
+		NetworkSession.State.CONNECTING,
+		NetworkSession.State.AUTHENTICATING,
+	]
+	_address.editable = not connecting
+	_join_button.disabled = connecting
+	_cancel_button.visible = connecting
+	_open_close_button.visible = (
+		_gameplay_context and _network_session.is_host()
+	)
+	if _open_close_button.visible:
+		_open_close_button.text = (
+			"close\ngame"
+			if _network_session.is_open_host()
+			else "open\ngame"
+		)
+	_session_summary.visible = (
+		_gameplay_context
+		and _network_session.state != NetworkSession.State.INACTIVE
+	)
+	if _session_summary.visible:
+		_session_summary.text = "%d / %d players" % [
+			_network_session.get_player_count(),
+			_network_session.get_session_max_players(),
+		]