EventsMixin.coffee

###*
 * @file
 * Provides support for classes to have event systems.
 * @url https://gist.github.com/donut/e4268b600bf72a8290e8
###

class EventsMixin
  constructor: ->
    @_event_handlers = {}

  bind: (event, handler) ->
    @_event_handlers[event] ?= []
    return yes if handler in @_event_handlers[event]
    @_event_handlers[event].push handler
    yes

  unbind: (event, handler) ->
    return yes unless event of @_event_handlers
    index = $.inArray handler, @_event_handlers[event]
    return yes if index is -1
    @_event_handlers[event].splice index, 1
    yes

  _trigger: (event, args...) ->
    console.log 'triggering', event, 'handlers', @_event_handlers[event]
    return null unless event of @_event_handlers
    handler args... for handler in @_event_handlers[event]

module.exports = EventsMixin