Function createEventStorage

codebase/sources/dhtmlxscheduler.js:1949–1988

(obj)

    }
  }
  const createEventStorage = function(obj) {
    let handlers = {};
    let index = 0;
    const eventStorage = function() {
      let combinedResult = true;
      for (const i in handlers) {
        const handlerResult = handlers[i].apply(obj, arguments);
        combinedResult = combinedResult && handlerResult;
      }
      return combinedResult;
    };
    eventStorage.addEvent = function(handler, settings) {
      if (typeof handler == "function") {
        let handlerId;
        if (settings && settings.id) {
          handlerId = settings.id;
        } else {
          handlerId = index;
          index++;
        }
        if (settings && settings.once) {
          const originalHandler = handler;
          handler = function() {
            originalHandler();
            eventStorage.removeEvent(handlerId);
          };
        }
        handlers[handlerId] = handler;
        return handlerId;
      }
      return false;
    };
    eventStorage.removeEvent = function(id) {
      delete handlers[id];
    };
    eventStorage.clear = function() {
      handlers = {};
    };
    return eventStorage;
  };
  function makeEventable(obj) {
    const eventHost = new EventHost();
    obj.attachEvent = function(eventName, handler, settings) {