code: public final void setAnimation(Animation enter, Animation exit) {
          setAnimation((enter != null) ? enter.getCssName() : Animation.NO_ANIMATION.getCssName(),
                  (exit != null) ? exit.getCssName() : Animation.NO_ANIMATION.getCssName());
      }
docs: Set Animation to Notify when it enters and exit the screen.
  
  Default is enter = Animation.FADE_IN_DOWN, exit = Animation.FADE_OUT_UP
  
  @see org.gwtbootstrap3.extras.animate.client.ui.constants.Animation
  
  @param enter animation style when Notify enters the screen
  @param exit  animation style when Notify exists the screen