utils.Event.Binding = function (master, event) {
  var self = this;

  var wrapper = function (func) {
    var args = Array.prototype.slice(arguments, 1);

    func.apply(self, self.args(args));
  };

  this.on = function (func) {
    return master.on(event, wrapper.bind(self, func));
  };

  this.args = function () { return arguments; };
};


utils.Event.bind = function (master, event, args) {
  var eventBinding = new utils.Event.Binding(master, event);

  if (args != null) {
    eventBinding.args = args;
  }

  return eventBinding;
};


utils.Event.Merger = function (events) {
  var self = this;

  var wrapper = function (func) {
    var args = Array.prototype.slice(arguments, 1);

    func.apply(self, self.args(args));
  };

  this.on = function (func) {
    events.forEach(function (event) {
      event.on(wrapper.bind(self, func));
    });
  };

  this.args = function () { return arguments; };
};


utils.Event.merge = function (events, args) {
  var mergedEvent = new utils.Event.Merger(events);

  if (args != null) {
    mergedEvent.args = args;
  }

  return mergedEvent;
};