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POHow does an MVC system work?
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  1. POHow does an MVC system work?
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    copied!<p>I'm trying to learn the MVC pattern, but each place say something different. So now I don't know whats the true MVC.</p> <p>So I'm guessing its the most pure MVC:</p> <ul> <li><strong>Model</strong> is <strong>just data</strong> and notify data changes.</li> <li><strong>View</strong> reads the messages of the <strong>Model</strong> to update the view.</li> <li><strong>Controller</strong> reads the user input from <strong>View</strong> and changes the Model according.</li> </ul> <p><strong>Implementing</strong></p> <ul> <li><strong>Model</strong> knows no one.</li> <li><strong>View</strong> knows the <strong>Model</strong>.</li> <li><strong>Controller</strong> knows both <strong>View</strong> and <strong>Model</strong>.</li> </ul> <p>Pseudocode:</p> <pre><code>/* Model */ class Color{ color = blue; setColor(color); notifyUpdate(); } /* View */ class ColorPicker(model){ model.register(update); update(){ this.colorToExhibit = model.color; } } /* Controller */ class Colorize(view, model){ view.register(update); update(color){ model.setColor(color); } } </code></pre> <p>Some questions:</p> <ol> <li>Is that right?</li> <li>I can't see why the <strong>View</strong> cannot change the <strong>Model</strong> directly, but through Controller.</li> <li>Suppose I have animations to be performed after an action. Who must handle this animation: the Model, the View, or the Controller? Also: the animation logic is part of the Model, View, or Controller? More: Suppose a Poker game. After the user choose an action (say, 'Raise'), the system must play an animation (say, the chips going from player spot to the desk). How can I see this poker example (with animation) as a MVC? Can you explain and give a pseudocode about that?</li> </ol> <p>Thank you.</p>
 

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