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POHow to initialize JavaFX controllers with the same model object?
 

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  1. POHow to initialize JavaFX controllers with the same model object?
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    <p><strong>Scenario</strong></p> <p>I am creating a GUI where multiple views reference the same model object. </p> <p><strong>What I am Accustom to</strong> </p> <p>In Swing, if i want all the views to reference the same model i would pass the model into the constructor. </p> <p><strong>What I am Currently Doing</strong></p> <p>In JavaFX, I am passing the model around by having a setter method in the views/controllers (menubars, split panes, tabs, ...), after each view/controller has been loaded. I find this very tacky and cumbersome. Additionally, I find it won't work because in certain situations i need the model to already exist in a controller before some of the controller widgets are initialized.</p> <p><strong>Lackluster Alternatives</strong></p> <p>(Note: I am referencing these stackoverflow questions: </p> <ul> <li><a href="https://stackoverflow.com/questions/10134856/javafx-2-0-how-to-application-getparameters-in-a-controller-java-file/10136403#10136403">Javafx 2.0 How-to Application.getParameters() in a Controller.java file</a></li> <li><a href="https://stackoverflow.com/questions/14187963/passing-parameters-javafx-fxml/14190310">Passing Parameters JavaFX FXML</a></li> <li><a href="https://stackoverflow.com/questions/12166786/multiple-fxml-with-controllers-share-object/">Multiple FXML with Controllers, share object</a></li> <li><p><a href="https://stackoverflow.com/questions/14370183/passing-parameters-to-a-controller-when-loading-an-fxml/14432578#14432578">Passing parameters to a controller when loading an FXML</a>)</p></li> <li><p>Dependency Injection</p> <ul> <li>I've looked at this website, <a href="http://www.zenjava.com/2011/10/23/javafx-2-0-fxml-and-spring/" rel="noreferrer">http://www.zenjava.com/2011/10/23/javafx-2-0-fxml-and-spring/</a>, and i have looked a little into google Guice, but I don't see a way of simplistically giving each JavaFX view/controller the same model object. It seemed like the injection would inject a different model for each view/controller.</li> </ul></li> <li><p>Saving the model object as a public static variable</p> <ul> <li>This is an option but at the moment I don't like the idea of having a public static model so open and available. Obviously, I can make it a private static variable and have getters and setters, but i don't like this idea much either. </li> </ul></li> <li><p>Passing Parameters from Caller to Controller</p> <ul> <li><p>I want each controller to load itself in its constructor, and I want each custom controller to be automatically injected into its parent controller. For example, the card overview tab loads itself like this:</p> <pre><code>public CardOverviewTab() { FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("card_overview_tab.fxml")); fxmlLoader.setRoot(content); fxmlLoader.setController(this); try { fxmlLoader.load(); } catch (Exception e) { e.printStackTrace(); } } </code></pre></li> <li><p>And the SingleGameSetup controller has the card overview tab automatically injected into a variable:</p> <pre><code>public class SingleGameSetupController extends AnchorPane { @FXML private CardOverviewTab cardOverviewTab; // Rest of the class } </code></pre></li> <li><p>And the part of the fxml containing the card overview tab looks like this:</p> <pre><code>&lt;CardOverviewTab fx:id="cardOverviewTab" /&gt; </code></pre></li> <li><p>This way I do not need to worry about manually loading a controller, but I still have the problem of setting the model.</p></li> </ul></li> <li><p>Setting a Controller on the FXMLLoader</p> <ul> <li>This option is similar to what I am accustom to, passing the model as a parameter into the constructor, but it still has the problem of loading controllers manually with the FXMLLoader. </li> </ul></li> <li><p>Event Bus</p> <ul> <li>I haven't read too much into this, but from what I have read the event bus seems to be inactive and outdated.</li> </ul></li> <li><p>Singleton</p> <ul> <li>This is similar to having a public static reference to the model object that controllers can retrieve, but again I am looking for a better solution. Plus, I do not want a singleton model.</li> </ul></li> </ul> <p><strong>What I am Looking for</strong></p> <p>Is there a way to pass the model object around in a less cumbersome way? I am looking for a way that is as simple as passing the model to a constructor, but I do not want to deal with manually loading controllers via the FXMLLoader, or setting the model after the controllers are loaded. Maybe having a class to retrieve the model is the best option, but I am asking just in case there is a better way.</p>
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    1. CO[Passing Parameters JavaFX FXML](http://stackoverflow.com/questions/14187963/passing-parameters-javafx-fxml) discusses numerous mechanisms for passing data into FXML controllers. Please review them. If any are a good fit, then answer your own question with the approach you took. If none are a good fit then add a lot more detail to your question regarding what you have tried and why it is not satisfactory.
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    2. CO+1 for research effort and added detail.
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