LabelFontScaler for Control Node in Godot 4

LabelFontScaler.gd

extends Control


# ensure that you attach this script to the parent node of your ui elements
# ensure that you link the signal "resize" of this control node to this script

# 
@export_enum("Horizontal","Vertical") var scaleMode = "Vertical"

# cache for all labels and ther initial font size
var labels:Array[Label]
var labels_dict:Dictionary

var initialScreenSize:Vector2i

func _ready():
	initialScreenSize = get_viewport_rect().size
	get_child_labels(self)

# fills label cache with references and their font size 
func get_child_labels(node:Node):
	if node is Label:
		var label = node as Label
		if not label.label_settings == null:
			labels.append(label)
			labels_dict[label] = label.label_settings.font_size
		
	if node.get_child_count()>0:
		for child in node.get_children():
			get_child_labels(child)

# calculates new font size and adjusts it to all labels reference in cache
func adjust_child_labels(currentScreenSize:Vector2i):
	for label in labels:
		var scale:float
		if(scaleMode == "Vertical"):
			scale = labels_dict[label] as float / initialScreenSize.y as float * currentScreenSize.y as float
		else:
			scale = labels_dict[label] as float / initialScreenSize.x as float * currentScreenSize.x as float
		label.label_settings.font_size = scale

# only execute on resize
func _on_resized() -> void:
	adjust_child_labels(get_viewport_rect().size)