Develop Reference

How to set an action to occur whenever JFXPanel is closed?

I'm building a Swing application and I'm using JFXPanel to bring up a WebView for user authentication. I need to return the url that the WebEngine is sent to after a successful user sign-on- but I don't know how to pull the URL from the view at the time the window is closed. I'm aware of Stage.setOnHiding, but this can't apply here since JFXPanels don't act as stages, though they contain a scene.
I'm very new to JavaFX so if this code snippet demonstrates bad conventions, I'd be happy to hear it!
private static void buildAuthBrowser() {
JFrame frame = new JFrame("frame");
final JFXPanel fxPanel = new JFXPanel();
frame.add(fxPanel);
frame.setSize(800, 600);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Platform.runLater(new Runnable() {
#Override
public void run() {
initFX(fxPanel);
}
});
}
private static void initFX(JFXPanel fxPanel) {
// fx thread
Scene scene = createScene();
fxPanel.setScene(scene);
}
private static Scene createScene() {
Group root = new Group();
Scene scene = new Scene(root);
WebView view = new WebView();
WebEngine browser = view.getEngine();
browser.load(auth.getUrl());
root.getChildren().add(view);
return (scene);
}

Found a solution- I was able to set a listener on the engine in the scene builder method, this way, every time the browser visits a new URL it automatically updates a private variable.
in createScene():
authBrowser.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> {
if (Worker.State.SUCCEEDED.equals(newValue)) {
setCode(authBrowser.getLocation());
}
});

JavaFX application doesn't close with swing content

I try to add Swing component to JavaFX application. I create SwingNode object with JButton but don't add this element to main Scene. After closing main stage, application stay running. What I need to do to fix this?
Example here:
public class SwingFx extends Application {
#Override
public void start(Stage stage) {
final SwingNode swingNode = new SwingNode();
createAndSetSwingContent(swingNode);
AnchorPane pane1 = new AnchorPane();
AnchorPane pane2 = new AnchorPane();
pane1.getChildren().add(swingNode);
stage.setScene(new Scene(pane2, 100, 50));
stage.show();
}
private void createAndSetSwingContent(final SwingNode swingNode) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
swingNode.setContent(new JButton("Click me!"));
}
});
}
public static void main(String[] args) {
launch(args);
}
}

I don't know why it happens, but I can give you some dirty solution to fix it. Application stay running after closing if you create SwingNode and don't add it to Scene. So you need to add SwingNode to Scene, but with zero size. This must fix your problem.
Example:
public class SwingFx extends Application {
#Override
public void start(Stage stage) {
// create pane with SwingNode
final SwingNode swingNode = new SwingNode();
createAndSetSwingContent(swingNode);
StackPane paneWithSwing = new StackPane(swingNode);
// create invisible pane to initialize SwingPane in Scene
Pane invisiblePane = new Pane(paneWithSwing);
invisiblePane.setPrefWidth(0);
invisiblePane.setPrefHeight(0);
invisiblePane.setOpacity(0);
// create Scene without visible SwingPane
Button button = new Button("Set SwingNode");
button.setOnAction(event -> {
invisiblePane.getChildren().clear();
stage.getScene().setRoot(paneWithSwing);
});
StackPane originalPane = new StackPane(invisiblePane, button);
stage.setScene(new Scene(originalPane, 320, 180));
stage.show();
}
private void createAndSetSwingContent(final SwingNode swingNode) {
SwingUtilities.invokeLater(() -> swingNode.setContent(new JButton("Click me!")));
}
public static void main(String[] args) {
launch(args);
}
}

Add a JPanel in a BorderPane

I have a Java project that plays a .flv media file through JavaFX Media Player, and it's working fine. Recently, I've been wanting to experiment by adding GUI components to this Project (JPanel, JLabel). However, I've failed in all my attempts and after doing some research turns out it's not as simple as i first thought.. I've tried borderPane.setTop(JLabel) but I get a "Cannot convert Jlabel to Node" error.. I feel that I'm missing something
If anyone has any idea why this isnt working for me, I would greatly appreciate any form of explanation or examples.. :)
Here is the code if it might be of use to you!
#Override
public void start(Stage stage){
String path = "Data/Video/Clip.flv";
Media media = new Media(new File(path).toURI().toString());
MediaPlayer mediaPlayer = new MediaPlayer(media);
MediaView mediaView = new MediaView(mediaPlayer);
BorderPane borderPane = new BorderPane();
borderPane.setCenter(mediaView);
//borderPane.add(logoPanel); <<<<<<< Error
Scene scene = new Scene(borderPane, 1024, 800);
scene.setFill(javafx.scene.paint.Color.BLACK);
stage.setTitle("Media Player");
stage.setScene(scene);
stage.show();
mediaPlayer.setAutoPlay(true);

BorderPane is a JavaFX Node whereas JPanel is a Java Swing Component.
You cannot add a JPanel to a BorderPane, what you are looking for instead is the JavaFX equivalent of the JPanel which is the Pane class.
If you are developing using JavaFX it is easier to just use JavaFX components. If you must use Swing components then you can use the SwingNode class.

What you basically want to achieve: add some Swing components to an JavaFX application.
You have to use SwingNode class to "wrap" a JComponent.
SwingNode Class
JavaFX 8 introduces the SwingNode class, which is located in the
javafx.embed.swing package. This class enables you to embed Swing
content in a JavaFX application. To specify the content of the
SwingNode object, call the setContent method, which accepts an
instance of the javax.swing.JComponent class.
You can check this tutorial how embed Swing component into JavaFX application.
Small example to put a Swing Button into the center of a BorderPane:
public class Main extends Application {
#Override
public void start(Stage primaryStage) {
try {
BorderPane root = new BorderPane();
Scene scene = new Scene(root,400,400);
SwingNode swingNode = new SwingNode();
JButton jButton = new JButton("I am a Swing button");
jButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("Message from Swing");
}
});
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
swingNode.setContent(jButton);
}
});
root.setCenter(swingNode);
primaryStage.setScene(scene);
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
By the way, BorderPane has no method "add" (as in your commented line):
You can use setCenter, setTop, setBottom, setLeft and setRight to add Nodes into it (as you used to fill the center).
If your goal was not to embed Swing into JavaFX, just to use JavaFX controls, you can check this article what controls JavaFX has by default.

javaFX launch app error

i'm trying to run this simple Javafx code:
public class Javafx extends Application
{
Stage window;
Scene scene1,scene2;
public static void main(String[] args) {
launch(args);
}
public void start(Stage primaryStage) throws Exception{
window = primaryStage;
Label label1 = new Label("click here to go to scene 2");
Button button1 = new Button("click here");
button1.setOnAction(e-> window.setScene(scene2));
VBox layout1 = new VBox(15);
layout1.getChildren().addAll(label1,button1);
scene1 = new Scene(layout1,700,900);
Label label2 = new Label("get back to scene1");
Button button2 = new Button("press");
button2.setOnAction(e-> window.setScene(scene1));
StackPane layout2 = new StackPane();
label2.setRotate(70);
layout2.getChildren().addAll(label2,button2);
scene2 = new Scene(layout2,500,500);
window.setScene(scene1);
window.setTitle("Java FX");
window.show();
}
}
but for some reason after i'm closing the app and rerun it,iv'e got an error:
application luanch must not called more than once.
as far as i can tell,the launch app called only once,but the only way for me to rerun it again is to reset first the JVM .
can anyone tell me how can i overcome this?
i'm using Bluej if that's matter,

Stop a JFX embedded YouTube video

I have a JPanel component containing a JFXPanel with a browser that embedds a YouTube video. I'm using the videos embed URL from YouTube (i.e. https://www.youtube.com/embed/W-J2OYN9fF8?autoplay=true&controls=0).
I can add the JPanel (VideoPlayer) to a surrounding component without any problem. However - when I remove the VideoPlayer I would also like to stop the YouTube-player. As of now - it keeps playing in the background (with annoying sound). I'm guessing I have to get inside the JFX thread somehow... So, if someone could please help me with code to put in the stopTrailer() method - I'd be very grateful!
Here's my current code. For those who are looking for a simple way to embed a JFX YouTube player in a normal JPanel - this works great - appart from the limitations above...
public class VideoPlayer extends JPanel {
private Stage stage;
private WebView browser;
private JFXPanel jfxPanel;
private WebEngine webEngine;
private String videoUrl;
public VideoPlayer(String url){
this.videoUrl = url;
jfxPanel = new JFXPanel();
createScene();
setLayout(new BorderLayout());
setPreferredSize(new Dimension(800, 560));
add(jfxPanel, BorderLayout.CENTER);
}
private void createScene() {
PlatformImpl.startup(new Runnable() {
#Override
public void run() {
stage = new Stage();
stage.setTitle("Video");
stage.setResizable(true);
Group root = new Group();
Scene scene = new Scene(root,80,20);
stage.setScene(scene);
//Set up the embedded browser:
browser = new WebView();
webEngine = browser.getEngine();
webEngine.load(videoUrl);
ObservableList<Node> children = root.getChildren();
children.add(browser);
jfxPanel.setScene(scene);
}
});
}
public void stopTrailer() {
}
}

The answer to this was actually really simple. I put the following in the stopTrailer method.
public void stopTrailer() {
PlatformImpl.startup(new Runnable() {
#Override
public void run() {
remove(jfxPanel);
webEngine.load(null);
}
});
}
What it actually does is to reload the browser webEngine to the "address" null. And removes the panel. It seems a bit weird to me cause I would interpret this code as the start of a second thread - without access to the first one. Perhaps someone could explain just how this works?