anchor.diff:        _log.finest('DragEnd: dragDelta=$dragDelta');
         
         // Determine if we are past the thresholds.
  -      if (dragDelta.abs() > distanceThreshold ||
  -          _dragStopwatch.elapsedMilliseconds < durationThreshold) {
  +      if (dragDelta.abs() > _distanceThreshold ||
  +          _dragStopwatch.elapsedMilliseconds < _durationThreshold) {
           
           // Direction of swipe. Dragging left means revealing page on the right!
           bool dragLeft = dragDelta < 0;
  
positive.code:    * Fired when the user ends the dragging. 
     * 
     * Is also fired when the user clicks the 'esc'-key or the window loses focus. 
     * For those two cases, the mouse positions of [DragEvent] will be null.
     */
    Stream<DragEvent> get onDragEnd => _dragDetector.onDragEnd;
    
  
negative.code:    * If swipe duration is less than [durationThreshold] (in ms), a swipe is  
     * detected (regardless of swipe distance).
     * 
     * The [draggingClass] is the css class set to the [swiperElement] 
     * while a user is dragging. If set to null, no such css class is added.
     * 
     * The [draggingClassBody] is the css class set to the html body tag
     * while a user is dragging. If set to null, no such css class is added.
     */
    Swiper(Element swiperElement, 
        { int startIndex: 0, 
          int speed: 300, 
          bool autoWidth: true, 
          double autoHeightRatio: null, 
          int distanceThreshold: 20,
          int durationThreshold: 250,
          bool disableTouch: false, 
          bool disableMouse: false,
          String handle: null, 
          String cancel: 'input, textarea, button, select, option',
          String draggingClass: 'swiper-dragging',
          String draggingClassBody: 'swiper-drag-occurring'})
          
        : this._swiperElement = swiperElement,
          this._speed = speed, 
          this._autoWidth = autoWidth,
          this._autoHeightRatio = autoHeightRatio,
          this._distanceThreshold = distanceThreshold, 
          this._durationThreshold = durationThreshold {
      
      _log.fine('Initializing Swiper');
      
  