tool
extends Sprite
class_name TK_FittingSprite

## A Sprite that is resized to absolute pixel size, no matter the texture.

const NO_SIZE_SENTINEL = Vector2(-1, -1)

export var target_size: Vector2 = NO_SIZE_SENTINEL setget _set_target_size

# todo: Ask context about preferred sizing if there's any.
func _enter_tree() -> void:
    # It's okay to fail here for non-grid contexts.
    if get_parent().get_parent().connect("cell_size_changed", self, "_update_cell_size"):
        _set_target_size(get_parent().get_parent().cell_size)
    elif target_size == NO_SIZE_SENTINEL:
        _set_target_size(texture.get_size())

func _set_target_size(p_size: Vector2) -> void:
    target_size = p_size
    _update_scale()

func _update_scale() -> void:
    scale = target_size / texture.get_size()

func _update_cell_size(_p_old_cell_size: Vector2, p_new_cell_size: Vector2) -> void:
    _set_target_size(p_new_cell_size)