Method onStateChange

codebase/sources/dhtmlxscheduler.es.js:9013–9021

(handler)

    }
  }
  onStateChange(handler) {
    this.onStateChangeHandlers.push(handler);
    return () => {
      const index = this.onStateChangeHandlers.indexOf(handler);
      if (index !== -1) {
        this.onStateChangeHandlers.splice(index, 1);
      }
    };
  }
  _notifyStateChange(oldState, newState) {
    this.onStateChangeHandlers.forEach((handler) => handler(oldState, newState));
  }