public void scrollLineToVisible(int line,int margin){
  int maxMargin=(parentHeight() - 20) / 2;
  if (margin > maxMargin) {
    margin=Math.max(0,maxMargin);
  }
  scrollLineToVisibleImpl(line,margin);
}

public void scrollLineToVisible ( int line , int margin ) { int maxMargin = ( parentHeight ( ) - 20 ) / 2 ; if ( margin > maxMargin ) { margin = Math . max ( 0 , maxMargin ) ; } scrollLineToVisibleImpl ( line , margin ) ; }
scroll the specified line into view , with a margin of ' margin ' pixels above and below
