Step to a value

        :param current: Current value.
        :param target: Target value.
        :param max_steps: Maximum number of steps.
        :param step_down: Down function.
        :param step_up: Up function.

def _to_value(self, current, target, max_steps, step_down, step_up):
        """ Step to a value

        :param current: Current value.
        :param target: Target value.
        :param max_steps: Maximum number of steps.
        :param step_down: Down function.
        :param step_up: Up function.
        """
        for _ in range(steps(current, target, max_steps)):
            if (current - target) > 0:
                step_down()
            else:
                step_up()