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path: root/game/src/Game/Autoload/GuiScale.gd
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extends Node

const error_guiscale : float = -1.0

@export
var minimum_guiscale : float = 0.1

const _starting_guiscales : Dictionary = {
   float(0.5) : &"0.5x",
   float(0.75): &"0.75x",
   float(1)   : &"1x",
   float(1.5) : &"1.5x",
   float(2)   : &"2x",
}

var _guiscales: Dictionary

#Similar to Resolution.gd, but we don't bother checking for strings from files
#and we have floats instead of vector2 integers

func _ready() -> void:
   assert(minimum_guiscale > 0, "Minimum gui scale must be positive")
   for guiscale_value : float in _starting_guiscales:
      add_guiscale(guiscale_value, _starting_guiscales[guiscale_value])
   assert(not _guiscales.is_empty(), "No valid starting gui scales!")

func has_guiscale(guiscale_value : float) -> bool:
   return guiscale_value in _guiscales

func add_guiscale(guiscale_value: float, guiscale_name: StringName=&"") -> bool:
   if has_guiscale(guiscale_value): return true
   var scale_dict := { value = guiscale_value }
   if not guiscale_name.is_empty():
      scale_dict.display_name = guiscale_name
   else:
      scale_dict.display_name = StringName("%sx" % guiscale_value)
   if guiscale_value < minimum_guiscale:
      push_error("GUI scale %s is smaller than the minimum %s" % [scale_dict.display_name, minimum_guiscale])
      return false
   _guiscales[guiscale_value] = scale_dict
   return true

#returns floats
func get_guiscale_value_list() -> Array:
   var list := _guiscales.keys()
   list.sort_custom(func(a : float, b : float) -> bool: return a > b)
   return list

func get_guiscale_display_name(guiscale_value : float) -> StringName:
   return _guiscales.get(guiscale_value, {display_name = &"unknown gui scale"}).display_name

func get_current_guiscale() -> float:
   return get_tree().root.content_scale_factor

func set_guiscale(guiscale:float) -> void:
   print("New GUI scale: %f" % guiscale)
   if not has_guiscale(guiscale):
      push_warning("Setting GUI Scale to non-standard value %sx" % [guiscale])
   get_tree().root.content_scale_factor = guiscale

func reset_guiscale() -> void:
   set_guiscale(get_current_guiscale())