New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  calculatePosition(trigger, content) {
    let { top, left, width, height } = trigger.getBoundingClientRect();
    let { height: contentHeight } = content.getBoundingClientRect();
    let style = {
      left: left + width,
      top: top +  window.pageYOffset
    };

    return { style };
  },
  
  calculatePositionInPlace(trigger, content) {
    let { top, left, width, height } = trigger.getBoundingClientRect();
    let { height: contentHeight } = content.getBoundingClientRect();
    let style = {
      left: width,
      top: window.pageYOffset
    };

    return { style };
  }
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

* {
  box-sizing: border-box; 
}

.ember-basic-dropdown-trigger,
.list-item {
  display: block;
  width: 200px;
  background: #333;
  color: #fff;
  padding: 1rem;
  margin: 0;
}

.ember-basic-dropdown-content {
  background: #333;
  color: #fff;
}

.ember-basic-dropdown-trigger > .ember-basic-dropdown-content {
  width: 100%;
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}

{{#basic-dropdown-hover calculatePosition=calculatePosition as |dd|}}
  {{#dd.trigger}}Hover me{{/dd.trigger}}
  {{#dd.content}}
  	{{#basic-dropdown-hover renderInPlace=true calculatePosition=calculatePositionInPlace as |dd|}}
      {{#dd.trigger}}Embedded Dropdown{{/dd.trigger}}
      {{#dd.content}}
        <p class="list-item">Here's my content</p>
      {{/dd.content}}
    {{/basic-dropdown-hover}}
    <p class="list-item">Hello world</p>
  {{/dd.content}}
{{/basic-dropdown-hover}}

{{#basic-dropdown-hover calculatePosition=calculatePosition as |dd|}}
  {{#dd.trigger}}Hover me{{/dd.trigger}}
  {{#dd.content}}
  	{{#basic-dropdown-hover renderInPlace=true calculatePosition=calculatePositionInPlace as |dd|}}
      {{#dd.trigger}}Embedded Dropdown{{/dd.trigger}}
      {{#dd.content}}
        <p class="list-item">Here's my content</p>
      {{/dd.content}}
    {{/basic-dropdown-hover}}
    <p class="list-item">Hello world</p>
  {{/dd.content}}
{{/basic-dropdown-hover}}

{{#basic-dropdown-hover calculatePosition=calculatePosition as |dd|}}
  {{#dd.trigger}}Hover me{{/dd.trigger}}
  {{#dd.content}}
  	{{#basic-dropdown-hover renderInPlace=true calculatePosition=calculatePositionInPlace as |dd|}}
      {{#dd.trigger}}Embedded Dropdown{{/dd.trigger}}
      {{#dd.content}}
        <p class="list-item">Here's my content</p>
      {{/dd.content}}
    {{/basic-dropdown-hover}}
    <p class="list-item">Hello world</p>
  {{/dd.content}}
{{/basic-dropdown-hover}}

<div id="ember-basic-dropdown-wormhole"></div>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2",
    "ember-basic-dropdown-hover": "0.5.0"
  }
}