docs: function (options) {
              if (isObject(options)) {
                  this.options.drag.enabled = options.enabled === false? false: true;
                  this.setPerAction('drag', options);
                  this.setOnEvents('drag', options);
  
                  if (/^x$|^y$|^xy$/.test(options.axis)) {
                      this.options.drag.axis = options.axis;
                  }
                  else if (options.axis === null) {
                      delete this.options.drag.axis;
                  }
  
                  return this;
              }
  
              if (isBool(options)) {
                  this.options.drag.enabled = options;
  
                  return this;
              }
  
              return this.options.drag;
          }