anchor.diff:    /**
      * Handles drag.
      */
  -  void _handleDrag(DragEvent dragEvent) {
  -    int deltaX = _calcDragDelta(dragEvent.startCoords.x, dragEvent.coords.x);
  +  void _handleDrag(DraggableEvent dragEvent) {
  +    int deltaX = _calcDragDelta(dragEvent.startPosition.x, dragEvent.position.x);
       
       _log.finest('Drag: deltaX=$deltaX');
   
  
positive.code:   /// The aspect ratio of the Swiper if it should be automatically applied.
    final double _autoHeightRatio;
    
    /// The [DragDetector] used to track drags on the [_containerElement].
    DragDetector _dragDetector;
    
    /// Stops the time between a drag start and a drag end to determine if the
    /// duration was below the [durationThreshold].
  
negative.code:    * soon as there is a drag movement. When a drag is started an [onDrag] event 
     * will also be fired.
     */
    Stream<DraggableEvent> get onDragStart => _draggable.onDragStart;
    
    /**
     * Fired periodically throughout the drag operation. 
     */
    Stream<DraggableEvent> get onDrag => _draggable.onDrag;
    
    /**
     * Fired when the user ends the dragging. 
  