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    <p>I got a prezi-presentation about a pattern that I call "State First".</p> <p>It is a combination of MPV/IoC/FSM and I've used it successfully in .Net/WinForms, .Net/Silverlight and Flex (at the moment).</p> <p>You start by coding your FSM:</p> <pre><code>class FSM IViewFactory ViewFactory; IModelFactory ModelFactory; Container Container; // e.g. a StackPanel in SL ctor((viewFactory,modelFactory,container) { ...assignments... start(); } start() { var view = ViewFactory.Start(); var model = ModelFactory.Start(); view.Context = model; view.Login += (s,e) =&gt; { var loginResult = model.TryLogin(); // vm contains username/password now if(loginResult.Error) { // show error? } else { loggedIn(loginResult.UserModel); // jump to loggedIn-state } }; show(view); } loggedIn(UserModel model) { var view = ViewFactory.LoggedIn(); view.Context = model; view.Logout += (s,e) =&gt; { start(); // jump to start }; show(view); } </code></pre> <p>Next up you create your IViewFactory and IModelFactory (your FSM makes it easy to see what you need)</p> <pre><code>public interface IViewFactory { IStartView Start(); ILoggedInView LoggedIn(); } public interface IModelFactory { IStartModel Start(); } </code></pre> <p>Now all you need to do is implement <code>IViewFactory</code>, <code>IModelFactory</code>, <code>IStartView</code>, <code>ILoggedInView</code> and the models. The advantage here is that you can see all transitions in the FSM, you get über-low coupling between the views/models, high testability and (if your language permits) a great deal of type safely.</p> <p>One important point in using the FSM is that your shouldn't just jump between the states - you should also carry all stateful data with you in the jump (as arguments, see <code>loggedIn</code> above). This will help you avoid global states that usually litter gui-code.</p> <p>You can watch the presentation at <a href="http://prezi.com/bqcr5nhcdhqu/" rel="nofollow noreferrer">http://prezi.com/bqcr5nhcdhqu/</a> but it contains no code examples at the moment.</p>
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