app.js

/*
 *
 * Models
 *
 */
Editor.Element = Em.Object.extend({
  type: 'element',
  name: 'something',
  position: {x:0, y:0},
  size: {width:0, height:0},
  content: 'abcdefg',

  positionChanged: function(){
    newPosition = this.get('position'); 
    $(this);
  }.observes('position')
});

Editor.TextElement = Editor.Element.extend({
  type: 'text'
});






/*
 *
 * Collections
 *
 */
Editor.elements = Em.ArrayController.create({
  // Init with empty array
  content: [],

  current: null,

  addElement: function(element){
    this.pushObject( element ); 
    this.current = element;
  },

  load: function(){
    this.addElement( Editor.Element.create({name:'lol'}) );
  }
});