Control the value (position) of the widget within its valid range.
Values outside the limits defined in Efl.Ui.Range_Display.range_limits are ignored and an error is printed.
Since 1.23
@property range_value @pure_virtual { get {} set {} values { val: double; } }
double efl_ui_range_value_get(const Eo *obj); void efl_ui_range_value_set(Eo *obj, double val);