add
fun add(event: DefaultEvent, listener: () -> Unit, scope: Any? = definedExternally): RemoveCallback(source)
Adds a listener to an event, and records the registration to be cleaned up later.
Return
A function that will remove this event listener when invoked.
Parameters
event
The event to attach to.
listener
The function to be executed when the event is raised.
scope
An optional object scope to serve as the this pointer in which the listener function will execute.