code: function dragHandler(event) {
              dragging.released = event.type === 'mouseup' || event.type === 'touchend';
              dragging.path     = within(
                  (dragging.touch ? event.originalEvent[dragging.released ? 'changedTouches' : 'touches'][0] : event)[o.horizontal ? 'pageX' : 'pageY'] - dragging.initLoc,
                  dragging.pathMin, dragging.pathMax
              );
  
              // Initialization
              if (!dragging.init && (Math.abs(dragging.path) > (dragging.touch ? 50 : 10) || dragging.source === 'handle')) {
                  dragging.init = 1;
                  if (dragging.source === 'slidee') {
                      ignoreNextClick = 1;
                  }
  
                  // Pause ongoing cycle
                  self.pause(1);
  
                  // Disable click actions on source element, as they are unwelcome when dragging
                  dragging.$source.on('click', function disableAction(event) {
                      stopDefault(event, 1);
                      if (dragging.source === 'slidee') {
                          ignoreNextClick = 0;
                      }
                      dragging.$source.off('click', disableAction);
                  });
  
                  // Trigger moveStart event
                  trigger('moveStart');
              }
  
              // Proceed when initialized
              if (dragging.init) {
                  stopDefault(event);
  
                  // Adjust path with a swing on mouse release
                  if (dragging.released && dragging.source === 'slidee' && o.speed > 33) {
                      dragging.path += dragging.path * 200 / (+new Date() - dragging.start);
                  }
  
                  slideTo(dragging.source === 'slidee' ? Math.round(dragging.initPos - dragging.path) : handleToSlidee(dragging.initPos + dragging.path));
              }
  
              // Cleanup and trigger :moveEnd event on release
              if (dragging.released) {
                  $doc.off(dragging.touch ? dragTouchEvents : dragMouseEvents, dragHandler);
                  (dragging.source === 'slidee' ? $slidee : $handle).removeClass(o.draggedClass);
  
                  // Account for item snapping position adjustment.
                  if (pos.cur === pos.dest) {
                      trigger('moveEnd');
                  }
              }
          }
docs: Handler for dragging scrollbar handle or SLIDEE.
  
  @param  {Event} event
  
  @return {Void}