     private func dragDidChange(moved: CGSize) {
         if dragging {
             self.state = .Changed
-            
+            lastMove = CGSizeMake(moved.width - prevMoved.width, moved.height - prevMoved.height)
             prevMoved = moved
             prevTimestamp = NSDate().timeIntervalSince1970
             

        if dragging {
            dragDelegate?.verticalDragFinished(origin: firstTouch,
                                               moved: moved,
                                               lastMove: CGSizeMake(moved.width - prevMoved.width, moved.height - prevMoved.height),
                                               duration: NSDate().timeIntervalSince1970 - prevTimestamp)
            dragging = false
        }

    private var dragging: Bool = false
    private var prevMoved: CGSize = CGSizeZero
    private var prevTimestamp: NSTimeInterval = 0
    private var lastMove: CGSize = CGSizeZero
    
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent) {
        super.touchesBegan(touches, withEvent: event)
