private long dragStartedAgo(){
  if (dragStarted == 0) {
    return -1;
  }
  return System.currentTimeMillis() - dragStarted;
}

private long dragStartedAgo ( ) { if ( dragStarted == 0 ) { return - 1 ; } return System . currentTimeMillis ( ) - dragStarted ; }
returns the time in milliseconds how long ago the current drag started .
