IEventEmitter

Type	Name	Interface Description
Functions	on(eventType: number, callback: (event: IEvent) => void, context?: object): void	Parameters • eventType: number The type of event to listen for, which can be either a number or a predefined UserEventType. • callback: (event: IEvent) => void A function that will be executed when the event occurs. This function receives an IEvent object as its parameter. • OptionalContext: object (Optional) The execution context in which the callback function should be called. Returns void Description Register an event listener for a specified event type, invoking the provided callback function when the event is triggered.
Functions	once(eventType: number, callback: (event: IEvent) => void, context?: object): void	Parameters • eventType: number The type of event to listen for. Can be either a number or a UserEventType enum value. • callback: (event: IEvent) => void The function to execute when the event is triggered. It takes an IEvent object as its parameter. • OptionalContext: object Optional: The context in which the callback will be executed. This can be used to maintain 'this' reference inside the callback. Returns void Description Register a callback that will be executed only once for the specified event type.
Functions	off(eventType: number, callback: (event: IEvent) => void, context?: object): void	Parameters • eventType: number The type of event to unregister. Can be a number or a UserEventType enum value. • callback: (event: IEvent) => void The callback function that was previously registered to handle the event. • OptionalContext: object Optional: The context object that was used when registering the callback. Returns void Description Unregister an event callback from the object.
Functions	emit(event: IEvent): void	Parameters • event: IEvent The event object to be emitted. Returns void Description Emits a specified event.

Examples

on(eventType: number, callback: (event:IEvent) => void, context?: object): void

emitter.on(myEventType, this.onMyEventType, this);

once(eventType: number, callback: (event:IEvent) => void, context?: object): void

emitter.once(myEventType, this.onMyEventType, this);

off(eventType: number, callback: (event:IEvent) => void, context?: object): void

emitter.off(myEventType, this.onMyEventType, this);

emit(event: IEvent): void

emitter.emit(APJS.EventManager.createEvent(MY_EVENT_TYPE));