l0.DependencyControl.EventEmitter

MoonScriptLua

EventEmitter = require "l0.DependencyControl.EventEmitter"

local EventEmitter = require("l0.DependencyControl.EventEmitter")

EventEmitter

Minimal event registration mixin: on(event, cb) / off(event, cb) / _emit(event, ...). Subclasses provide an @Event Enum that defines the valid event values.

Constructor

MoonScriptLua

eventEmitter = EventEmitter!

local eventEmitter = EventEmitter()

Creates an event emitter with an empty listener registry.

Instance methods

on

MoonScriptLua

eventEmitter\on event, callback

eventEmitter:on(event, callback)

Registers a callback for an event.

param	type	description
event	any	The event value (a member of the subclass's @Event enum).
callback	fun(self: EventEmitter, ...)	Called with the emitter instance plus any event arguments.

Returns:

• self EventEmitter — for chaining

off

MoonScriptLua

eventEmitter\off event, callback

eventEmitter:off(event, callback)

Unregisters a previously-registered callback for an event.

param	type	description
event	any	The event value.
callback	function	The exact callback previously passed to on().

Returns:

• self EventEmitter — for chaining

_emit

MoonScriptLua

eventEmitter\_emit event, ...

eventEmitter:_emit(event, ...)

Invokes every listener registered for an event, passing the emitter instance followed by the given arguments. A listener may safely register or remove listeners during dispatch.

param	type	description
event	any	The event value whose listeners to invoke.
...	any	Extra arguments forwarded to each listener after the emitter instance.