code: @Api
  	public void setMouseWheelController(MouseWheelHandler controller) {
  		setZoomOnScrollEnabled(false);
  		mouseWheelRegistration = graphics.addMouseWheelHandler(controller);
  	}
docs: Set a new mouse wheel controller on the map. If the zoom on scroll is currently enabled, it will be disabled
  first.
  
  @param controller
  The new mouse wheel controller to be applied on the map.
  @since 1.6.0