Simple Event dispatcher with CoffeeScript.

SimpleEventDispatcher.coffee

class Disposal
    constructor: ->
    dispose: ->
        @el?.parentNode?.removeChild @el
        @el = null
        @off?()
        @disposeInternal.apply @, arguments

    disposeInternal: ->

# ----------------------------------------------

class EventDispatcher extends Disposal
    on: (evtName, func, context = @) ->
        evtHandlers = @evtHandlers or (@evtHandlers = {})
        handler = evtHandlers[evtName] or (evtHandlers[evtName] = [])
        handler.push [func, context]
        return @

    off: (evtName, func) ->
        evtHandlers = @evtHandlers or (@evtHandlers = {})

        if evtName?
            handler = evtHandlers[evtName] or (evtHandlers[evtName] = [])
            for i in [0...handler.length]
                if handler[i]?[0] is func
                    handler.splice i, 1

        else
            @evtHandlers = {}

        return @

    fire: (evtName, data) ->
        evtHandlers = @evtHandlers or (@evtHandlers = {})
        handler = evtHandlers[evtName] or (evtHandlers[evtHandlers] = [])

        for i in [0...handler.length]
            handler[i][0].call handler[i][1], data
        return @