extends Node

# Enforce a Chinese-capable font for every UI control, including controls
# constructed dynamically after their scene has loaded.
const UI_FONT: FontFile = preload("res://assets/fonts/msyh.ttc")

func _enter_tree() -> void:
	get_tree().node_added.connect(_on_node_added)
	_apply_font_recursively(get_tree().root)

func _exit_tree() -> void:
	var node_added_callback := Callable(self, "_on_node_added")
	if get_tree().node_added.is_connected(node_added_callback):
		get_tree().node_added.disconnect(node_added_callback)

func _on_node_added(node: Node) -> void:
	_apply_font_recursively(node)

func _apply_font_recursively(node: Node) -> void:
	if node is Control:
		var control := node as Control
		control.add_theme_font_override(&"font", UI_FONT)
		if control is RichTextLabel:
			control.add_theme_font_override(&"normal_font", UI_FONT)
	for child in node.get_children():
		_apply_font_recursively(child)