Method _notifyStateChange

codebase/sources/dhtmlxscheduler.js:9026–9028

(oldState, newState)

      };
    }
    _notifyStateChange(oldState, newState) {
      this.onStateChangeHandlers.forEach((handler) => handler(oldState, newState));
    }
    _adjustDate(direction) {
      const { mode, date } = this.getState();
      const newDate = new Date(date);