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copied!<p>I've implemented a mixin "Memento" which tracks changes of the properties defined in <code>mementoProperties</code> array. It supports <em>normal</em> properties as well as <em>array</em> properties.</p> <p>The basic idea is the following: when the mixin is initialized, it registers itself as observer for property changes. A property change adds a new item to the <code>memento</code> array which represents the history of changes made. Invoking <code>undo</code> sets the property to the state before the change has been made. <code>redo</code> respectively resets the value.</p> <p>The <a href="https://github.com/pangratz/ember-memento/blob/master/app/lib/memento.js" rel="noreferrer">mixin</a> is hosted on GitHub at <strong><a href="https://github.com/pangratz/ember-memento" rel="noreferrer">ember-memento</a></strong>. It can be used as follows, see <a href="http://jsfiddle.net/pangratz666/9fa95/" rel="noreferrer">http://jsfiddle.net/pangratz666/9fa95/</a>:</p> <pre class="lang-js prettyprint-override"><code>App.obj = Ember.Object.create(Ember.Memento, { name: 'hello', myArray: [], age: 12, mementoProperties: 'name age myArray'.w() }); App.obj.get('myArray').pushObject(1); App.obj.get('myArray').pushObject(2); App.obj.get('myArray').pushObject(3); App.obj.set('name', 'hubert'); App.obj.get('myArray').pushObject(4); App.obj.set('age', 190); App.obj.get('myArray').pushObjects(['a', 'b']); App.obj.undo(); // myArray = [1,2,3,4] App.obj.undo(); // age = 12 App.obj.undo(); // myArray = [1,2,3] App.obj.undo(); // name = 'hello' App.obj.redo(); // name = 'hubert' App.obj.redo(); // myArray = [1,2,3,4] App.obj.redo(); // age = 190 </code></pre>

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