anchor.diff:    /// CSS class set to the html body tag during a drag. Default is 
     /// 'swiper-drag-occurring'. If null, no CSS class is added.
     String dragOccurringClass = 'swiper-drag-occurring';
  +  
     
     // -------------------
     // Events
  
positive.code:  * A touch and mouse slider for swiping through images and html.
   */
  class Swiper {
    /// How many pixels until a swipe is detected.
    static const int DISTANCE_THRESHOLD = 20;
    
    // -------------------
    // Options
    // -------------------
    /// CSS class set to the swiper element while a user is dragging. Default 
    /// class is 'swiper-dragging'. If null, no css class is added.
    String draggingClass = 'swiper-dragging';
  
negative.code:       _log.finest('DragEnd: deltaX=$deltaX');
        
        // Determine if we are past the threshold.
        if (deltaX.abs() > distanceThreshold) {
          // Determine direction of swipe.
          bool directionRight = deltaX > 0;
          
  