New Twiddle

controllers.application.js

import Ember from 'ember';
import { adjustCSS } from 'ember-animated/motions/adjust-css';
import move from 'ember-animated/motions/move';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  inset: false,
  
  *transition({ insertedSprites, removedSprites }) {
		console.log(arguments[0]);
  	for (let sprite of insertedSprites) {
      sprite.applyStyles({ 'left': '3rem' });
      // adjustCSS('margin', sprite);
      // move(sprite);
    }
	}
});

styles.app.css

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

.cell {
 	padding: 1rem;
  margin: 1rem 0;
  background: steelblue;
  color: white;
}

.cell.inset {
/* 	margin-left: 5rem;
  margin-right: 5rem; */
}

templates.application.hbs

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


{{#animated-value inset use=transition as |compressed|}}
	<div class="cell {{if compressed 'inset'}}">
		{{if compressed 'COMPRESSED' 'EXPANDED'}}
	</div>
{{/animated-value}}

<button type="button" onclick={{action (mut inset) (not inset)}}>Toggle</button> ({{inset}})


<br>
<br>
{{outlet}}
<br>
<br>

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-animated": "0.6.1",
    "ember-truth-helpers": "2.1.0"
  }
}