source: Dev/trunk/src/client/dojo/Evented.js

define(["./aspect", "./on"], function(aspect, on){
        // module:
        //              dojo/Evented

        "use strict";
        var after = aspect.after;
        function Evented(){
                // summary:
                //              A class that can be used as a mixin or base class,
                //              to add on() and emit() methods to a class
                //              for listening for events and emitting events:
                // example:
                //              |       define(["dojo/Evented", "dojo/_base/declare", "dojo/Stateful"
                //              |       ], function(Evented, declare, Stateful){
                //              |               var EventedStateful = declare([Evented, Stateful], {...});
                //              |               var instance = new EventedStateful();
                //              |               instance.on("open", function(event){
                //              |               ... do something with event
                //              |        });
                //              |
                //              |       instance.emit("open", {name:"some event", ...});
        }
        Evented.prototype = {
                on: function(type, listener){
                        return on.parse(this, type, listener, function(target, type){
                                return after(target, 'on' + type, listener, true);
                        });
                },
                emit: function(type, event){
                        var args = [this];
                        args.push.apply(args, arguments);
                        return on.emit.apply(on, args);
                }
        };
        return Evented;
});