wysihtml.lang.Dispatcher = Base.extend(
  /** @scope wysihtml.lang.Dialog.prototype */ {
  on: function(eventName, handler) {
    this.events = this.events || {};
    this.events[eventName] = this.events[eventName] || [];
    this.events[eventName].push(handler);
    return this;
  },

  off: function(eventName, handler) {
    this.events = this.events || {};
    var i = 0,
        handlers,
        newHandlers;
    if (eventName) {
      handlers    = this.events[eventName] || [],
      newHandlers = [];
      for (; i<handlers.length; i++) {
        if (handlers[i] !== handler && handler) {
          newHandlers.push(handlers[i]);
        }
      }
      this.events[eventName] = newHandlers;
    } else {
      // Clean up all events
      this.events = {};
    }
    return this;
  },

  fire: function(eventName, payload) {
    this.events = this.events || {};
    var handlers = this.events[eventName] || [],
        i        = 0;
    for (; i<handlers.length; i++) {
      handlers[i].call(this, payload);
    }
    return this;
  },

  // deprecated, use .on()
  observe: function() {
    return this.on.apply(this, arguments);
  },

  // deprecated, use .off()
  stopObserving: function() {
    return this.off.apply(this, arguments);
  }
});
