AtkValue The ATK interface implemented by valuators and components which display or select a value from a bounded range of values. #AtkValue should be implemented for components which either display a value from a bounded range, or which allow the user to specify a value from a bounded range, or both. For instance, most sliders and range controls, as well as dials, should have #AtkObject representations which implement #AtkValue on the component's behalf. #AtKValues may be read-only, in which case attempts to alter the value return FALSE to indicate failure. The AtkValue structure does not contain any fields. @obj: @value: @obj: @value: @obj: @value: @obj: @value: @Returns: @obj: @value: