ember-cli-sliding-menu/app/services/menu-progress.js

The convenient sliding-menu component

import Ember from 'ember';

/**
 * Share Menu progress manager
 * so you can handle menu state from any controller or component
 */
export default Ember.Object.extend({
  menuProgress: 0,
  updateProgress: function(newProgress) {
    this.set('menuProgress', newProgress);
  }
});