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  * The Original Software is NetBeans. The Initial Developer of the Original

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 package net.java.html.boot.fx;

 import java.net.URL;

 import javafx.beans.value.ChangeListener;

 import javafx.beans.value.ObservableValue;

 import javafx.concurrent.Worker;

 import javafx.scene.web.WebView;

 import net.java.html.boot.BrowserBuilder;

 import net.java.html.js.JavaScriptBody;

 import org.netbeans.html.boot.fx.AbstractFXPresenter;

 /** Utility methods for working with <em>JavaFX</em> <code>WebView</code>s.

  *

  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  * @since 0.6

  */

 public final class FXBrowsers {

     private FXBrowsers() {

     }

     /** Enables the Java/JavaScript brige (that supports {@link JavaScriptBody} and co.)

      * in the provided <code>webView</code>. This method returns 

      * immediately. Once the support is active, it calls back specified

      * method in <code>onPageLoad</code> class - the class can possibly be

      * loaded by a different classloader (to enable replacement of

      * methods with {@link JavaScriptBody} annotations with executable

      * versions). The method <code>methodName</code> needs to be <code>public</code>

      * (in a public class), <code>static</code> and take either no parameters

      * or an array of {@link String}s.

      * 

      * @param webView the instance of Web View to tweak

      * @param url the URL of the HTML page to load into the view

      * @param onPageLoad callback class with method <code>methodName</code>

      * @param methodName the method to call when the page is loaded

      * @param args arguments to pass to the <code>methodName</code> method

      */

     public static void load(

         final WebView webView, final URL url, 

         Class<?> onPageLoad, String methodName,

         String... args

     ) {

         class Load extends AbstractFXPresenter {

             @Override

             protected void waitFinished() {

                 // don't wait

             }

             @Override

             protected WebView findView(URL resource) {

                 final Worker<Void> w = webView.getEngine().getLoadWorker();

                 w.stateProperty().addListener(new ChangeListener<Worker.State>() {

                     @Override

                     public void changed(ObservableValue<? extends Worker.State> ov, Worker.State t, Worker.State newState) {

                         if (newState.equals(Worker.State.SUCCEEDED)) {

                             onPageLoad();

                         }

                         if (newState.equals(Worker.State.FAILED)) {

                             throw new IllegalStateException("Failed to load " + url);

                         }

                     }

                 });

                 return webView;

             }

         }

         BrowserBuilder.newBrowser(new Load()).

             loadPage(url.toExternalForm()).

             loadClass(onPageLoad).

             invoke(methodName, args).

             showAndWait();

     }

 }