code: function isAvailableBehavior(behaviorToCheck, e, settings) {
      var setting = settings[behaviorToCheck];
      return !behaviorToCheck || (
          setting && (!zrUtil.isString(setting) || e.event[setting + 'Key'])
      );
  }
docs: settings: { zoomOnMouseWheel moveOnMouseMove moveOnMouseWheel } The value can be: true / false / 'shift' / 'ctrl' / 'alt'.