simple_nodes: Add SimpleEnding node

This provides a label that displays either a win or lose message along
with blocks to set or clear the label during the game. A LabelSettings
instance is provided to easily customize the text settings for the
label.

Since the Label isn't created until simple_setup and that runs after
_ready, a signal is used to defer the game_over and reset methods until
the label exists. Otherwise, using the blocks from a "when starting"
block would crash.

https://phabricator.endlessm.com/T35661

addons/block_code/simple_nodes/simple_ending/simple_ending.gd

@@ -0,0 +1,114 @@
+@tool
+class_name SimpleEnding
+extends Control
+
+const BlockDefinition = preload("res://addons/block_code/code_generation/block_definition.gd")
+const BlocksCatalog = preload("res://addons/block_code/code_generation/blocks_catalog.gd")
+const OptionData = preload("res://addons/block_code/code_generation/option_data.gd")
+const Types = preload("res://addons/block_code/types/types.gd")
+
+## Emitted when SimpleEnding has completed setup.
+signal setup
+
+## The message that will be shown when the player wins the game.
+@export var win_message: String = "YOU WIN!"
+
+## The message that will be shown when the player loses the game.
+@export var lose_message: String = "GAME OVER"
+
+## Text settings for the message label.
+@export var label_settings: LabelSettings
+
+var _label: Label
+
+
+func game_over(result: String):
+	# Wait until simple_setup completes so the label exists.
+	await setup
+
+	match result:
+		"WIN":
+			_label.text = win_message
+		"LOSE":
+			_label.text = lose_message
+		_:
+			_label.text = ""
+			push_warning('Unrecognized game result "%s"' % result)
+
+
+func reset():
+	# Wait until simple_setup completes so the label exists.
+	await setup
+
+	_label.text = ""
+
+
+func _create_label_settings():
+	if label_settings:
+		return
+
+	label_settings = LabelSettings.new()
+	label_settings.font_size = 200
+
+
+func _create_label():
+	if _label:
+		return
+
+	_label = Label.new()
+	_label.label_settings = label_settings
+	_label.horizontal_alignment = HorizontalAlignment.HORIZONTAL_ALIGNMENT_CENTER
+	_label.vertical_alignment = VerticalAlignment.VERTICAL_ALIGNMENT_CENTER
+
+	add_child(_label)
+
+
+func _ready():
+	simple_setup()
+
+
+func simple_setup():
+	_create_label_settings()
+	_create_label()
+
+	if Engine.is_editor_hint():
+		# Show the win message in the editor so adjusting the label settings
+		# is visible.
+		_label.text = win_message
+
+	setup.emit()
+
+
+func get_custom_class():
+	return "SimpleEnding"
+
+
+static func setup_custom_blocks():
+	var _class_name = "SimpleEnding"
+	var block_list: Array[BlockDefinition] = []
+	var block_definition: BlockDefinition
+
+	block_definition = BlockDefinition.new()
+	block_definition.name = &"simpleending_game_over"
+	block_definition.target_node_class = _class_name
+	block_definition.category = "Lifecycle | Game"
+	block_definition.type = Types.BlockType.STATEMENT
+	block_definition.display_template = "game over {result: STRING}"
+	block_definition.code_template = "game_over({result})"
+	block_definition.defaults = {
+		"result": OptionData.new(["WIN", "LOSE"]),
+	}
+	block_definition.description = "Show the game over label with the win or lose message."
+	block_list.append(block_definition)
+
+	block_definition = BlockDefinition.new()
+	block_definition.name = &"simpleending_reset"
+	block_definition.target_node_class = _class_name
+	block_definition.category = "Lifecycle | Game"
+	block_definition.type = Types.BlockType.STATEMENT
+	block_definition.display_template = "reset game over"
+	block_definition.code_template = "reset()"
+	block_definition.description = "Reset the game over label."
+	block_list.append(block_definition)
+
+	BlocksCatalog.add_custom_blocks(_class_name, block_list)

addons/block_code/ui/constants.gd

@@ -22,6 +22,11 @@ const BUILTIN_CATEGORIES_PROPS: Dictionary = {
 		"color": Color("ec3b59"),
 		"order": 10,
 	},
+	"Lifecycle | Game":
+	{
+		"color": Color("ec3b59"),
+		"order": 12,
+	},
 	"Lifecycle | Spawn":
 	{
 		"color": Color("ec3b59"),