Symbolic name


  0Gtk::UPDATE_CONTINUOUS Means that anytime the range slider is moved, the range value will change and the value_changed signal will be emitted.
  1Gtk::UPDATE_DISCONTINUOUS Means that the value will only be updated when the user releases the button and ends the slider drag operation.
  2Gtk::UPDATE_DELAYED Means that the value will be updated after a brief timeout where no slider motion occurs, so updates are spaced by a short time rather than continuous.