New Twiddle

components.child-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  attributeBindings: ['contenteditable'],
  contenteditable: true,
  focusIn() {console.log('child focusIn');},
  setFocus() {console.log('child setFocus'); this.$().focus();},
  eventPasser: Ember.Object.extend(Ember.Evented).create({}),
  init() {
    this._super();
    this.get('registerFocus')(() => this.setFocus());
  }
});

components.parent-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  registerFocus(fn) { this.focusChild = fn; },
  focusChild() {},
  click() {
    console.log('parent click');
    this.focusChild();
  },
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{parent-component}}
<br>
<br>

templates.components.child-component.hbs

child

templates.components.parent-component.hbs

{{yield}}
<p>parent</p>
{{child-component registerFocus=(action registerFocus)}}

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.9.0"
  }
}