A Backbone Event wrapper for browser window events

window-emitter.js

define(['jquery', 'underscore', 'backbone'], function($, _, Backbone) {
  'use strict';

  var WindowEmitter = _.extend({}, Backbone.Events);
  var $window = $(window);
  // 0.1 second is about the limit for having the user feel that the
  // system is reacting instantaneously, meaning that no special feedback
  // is necessary except to display the result.
  // Source: http://www.nngroup.com/articles/response-times-3-important-limits/
  var period = 100;

  var triggerResize = _.bind(WindowEmitter.trigger, WindowEmitter, 'resize');
  var triggerScroll = _.bind(WindowEmitter.trigger, WindowEmitter, 'scroll');

  $window.on('resize', _.throttle(triggerResize, period));
  $window.on('scroll', _.throttle(triggerScroll, period));

  return WindowEmitter;
});