Function createEventStorage

codebase/sources/dhtmlxscheduler.es.js:1945–1984

(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) {