godot-TBL-extension-base/components/ui/integer_scaling_control.gd

class_name IntegerScalingControl extends Control

@export
var auto_scaling_rate:bool = true

@export_range(0, 65535)
var fixed_scaling_rate:int = 1

var _origin_size: Vector2

func _ready() -> void:
	_origin_size = size
	layout_mode = 1
	get_viewport().size_changed.connect(_on_screen_resized, CONNECT_DEFERRED)
	_on_screen_resized()

func _on_screen_resized() -> void:
	var window_size: Vector2i = get_viewport().size
	var raw_size := Vector2(ProjectSettings["display/window/size/viewport_width"], ProjectSettings["display/window/size/viewport_height"])
	
	var final_scale: Vector2i
	
	if auto_scaling_rate:
		var possible_scale := window_size / Vector2i(raw_size)
		final_scale = max(1, min(possible_scale.x, possible_scale.y)) * Vector2i.ONE
	else:
		final_scale = Vector2i.ONE * fixed_scaling_rate

	scale = final_scale
	
	var window_size_unscaled := Vector2(window_size.x / final_scale.x, window_size.y / final_scale.y)
	var diff_x :float = window_size_unscaled.x - _origin_size.x
	var diff_y :float = window_size_unscaled.y - _origin_size.y

	anchor_left = 0.5
	anchor_right = 0.5
	anchor_top = 0.5
	anchor_bottom = 0.5
	offset_left = -(_origin_size.x + diff_x) / 2
	offset_right = (_origin_size.x + diff_x) / 2
	offset_top = -(_origin_size.y + diff_y) / 2
	offset_bottom = (_origin_size.y + diff_y) / 2
	grow_horizontal = Control.GROW_DIRECTION_BOTH
	grow_vertical = Control.GROW_DIRECTION_BOTH
	
	pivot_offset = size / 2