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  1. PO
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    <p>From my perspective, this is something I ran into when I first tried to separate out my Models, Views and Controllers in my first desktop application. </p> <p>With Web Applications, the MVC pattern fits VERY naturally because of the innate nature of the web, but unfortunately it's not possible to fit a pure MVC patter to a desktop app, where the Operating system plays an innate role in notifications. This usually leads to the pattern being implemented as you've shown in your diagram.</p> <p>However the pattern that you've shown really needs to be implemented like this, I think (I've switched over to .NET after a brief affair with Java, so please keep that in mind):</p> <pre><code>public class ContactManagerMainScreenModel { ContactManagerMainScreen v; // Loading Local Storage LocalContactStorage LocalContactStorage = new LocalContactStorage(); // Favorite list boolean showFavoritesList = true; public void register(ContactManagerMainScreen v) { this.v = v; } public void ShowOrHideFavoritesList() { if(showFavoritesList) { showFavoritesList = false; v.RefreshView(this); } else { showFavoritesList = true; v.RefreshView(this); } } } </code></pre> <p>Meanwhile the controller would be responsible for receiving user actions. So if you have a button that says "Toggle Favorites", this would cause the controller to call _model.ShowOrHideFavoritesList(). The model would update itself and ask the view to refresh itself using it's new state. </p> <p>The view would now be free from the dependency on the controller.</p>
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    1. POJava MVC - Doesn't feel like I get it
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    1. USPraveen Angyan
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    1. COAgain, thanks for your answer. Your implementation would lead to a model which directly controls the UI itself. Would you suggest dropping the entire controller?
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      1. USHenrik P. Hessel
    2. CONo, please read my last two paragraphs after the code. The controller is responsible for handling ALL user notifications. Here's another example. Let's say the user clicks on "Add New Contact", the controller would be responsible for calling _model.AddNewContact(string firstName, string lastName). The model would then add this contact to it's own internal state and then call RefreshView(this) on the view.
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      1. USPraveen Angyan
    3. COWhat I mean is that the controller is still responsible for capturing all user notifications and then decidiing how to update the model. The model then always calls RefreshView(this) on the view which then redisplays itself...
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      1. USPraveen Angyan
 

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