It will call getscrollbarvalues and update the scrollbars. Supplied by you and called after user interaction. For 'set' , value will contain the new scrollbar position. Auxiliary method to help you calculate values to return from getscrollbarvalues . If you override this method call this one at the end of your method.
Moves scrollbars to the correct position.
Call this method initially if you override it. Handles scrollbar interaction. If you override it call this method first, a nonzero return value indicates the hit was in the scrollbars and has been handled.