choro.coffee

EventEmitter = () ->

EventEmitter.prototype =
  # Add a new listener for an event
  bind: (event, func) ->
    this._events = this._events or {}
    this._events[event] = this._events[event] or []
    this._events[event].push(func)
  # Remove a listener for an event
  unbind: (event, func) ->
    this._events = this._events or {}
    return false if event in this._eventListeners is false
    this._events[event].splice(this._events[event].indexOf(func), 1)
  # Emit a specific event and trigger all of its listeners
  emit: (event) ->
    this._events = this._events or {}
    return null if event in this._events is false
    for func in this._events[event]
      func.apply(this, Array.prototype.slice.call(arguments, 1))

# A mixin function to implement event emitter functionality
# for any class/object
EventEmitter.mixin = (destination) ->
  props = ['bind', 'unbind', 'trigger']
  for prop in props
    destination.prototype[prop] = EventEmitter.prototype[prop]