Abstract
Removes a handler from event type. If no handler is provided, all handlers will be removed from the event
handler
type
Optional
The object that dispatched the event
Adds function handler to handle event type
The EventDispatcher object
Adds function handler to handle event type just once. The handler will be automatically removed after first execution
Removes a
handlerfrom eventtype. If no handler is provided, all handlers will be removed from the event