The title seems a little bit confusing, but I'll explain everything.
I'm developing a project where I show the image captured by a webcam in a JPanel, Java Swing. Now I have to integrate this with JavaFx.
I have a controller where I have the method startRecording, that would initialize the cameraThread and tell the class Camera to startRecording, inside Camera class a have a method DrawFrame(BufferedImage, JPanel panel) where I call the function drawImage from OpenCV to draw in the Panel:
Controller:
public void startRecording(){
cameraInstance.setCameraRGBPanel(windowsInstance.getCameraRGBPanel());
cameraInstance.setCameraHSVPanel(windowsInstance.getCameraHSVPanel());
cameraInstance.setCameraThresholdPanel(windowsInstance.getCameraThresholdPanel());
cameraInstance.setRecord(true);
cameraThread = new Thread(cameraInstance);
cameraThread.start();
}
Class camera:
private void drawFrame(BufferedImage buff, JPanel pane){
pane.getGraphics().drawImage(buff, 0, 0, null);
}
To start with, JavaFX has no JPanel and the Pane (an option) has no getGraphics, I've tried to use a SwingNode, add the JPanel and then do everything as usual, but the image simply won't be shown.
The following code was a test, that's why it seems to be so 'bad'.
public void start(Stage stage) throws Exception {
stage.setTitle("Tela Teste");
pCamera = new Pane();
SwingNode swing = new SwingNode();
pCamera.getChildren().add(swing);
createAndSetSeingContent(swing);
Group root = new Group();
root.getChildren().add(pCamera);
stage.setScene(new Scene(root , 500, 500));
stage.setResizable(true);
stage.show();
}
private void createAndSetSeingContent(SwingNode swing) {
ControllerCamera control = new ControllerCamera();
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
JPanel panel = new JPanel();
JLabel label = new JLabel("Abc");
//panel.add(label);
swing.setContent(panel);
Button teste = new Button("A");
pCamera.getChildren().add(teste);
teste.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
control.startRecording(panel);
System.out.println("abc");
}
});
}
I changed to method startRecording to something like:
public void startRecording(JPanel panel){
cameraInstance.setCameraRGBPanel(panel);
cameraInstance.setRecord(true);
cameraThread = new Thread(cameraInstance);
cameraThread.start();
}
Still nothing appears in the panel, but if I add a label or button, then it appear and works as intended to. The "abc" is always shown in the console.
I think that's all the code related to the problem. Something else I want to say is that yesterday was the first day I was dealing with FX, let's say the project is divided, the other guy is also working on the problem, but we haven't gotten anywhere so far, that's why I decided to ask you here.
Edit 1: everything was working perfectly before all this situation (everything works with Swing, but not in FX).
The simplest way to display an Image in JavaFX is with an ImageView. You can create a single ImageView and update its image by calling setImage(...), passing in a javafx.scene.image.Image. I don't know the camera API you are working with: you might be able to generate a JavaFX image directly, in which case your draw frame method looks as simple as:
private void drawFrame(Image image, ImageView imageView) {
imageView.setImage(image);
}
If you can only generate BufferedImages, you can do
private void drawFrame(BufferedImage buff, ImageView imageView) {
imageView.setImage(SwingFXUtils.toFXImage(buff, null));
}
In either case, you can just create the ImageView, put it in a Pane subclass of some kind, put the Pane in a scene and display it in the Stage:
public void start(Stage stage) throws Exception {
stage.setTitle("Tela Teste");
pCamera = new Pane();
ImageView imageView = new ImageView();
pCamera.getChildren().add(imageView);
Group root = new Group();
root.getChildren().add(pCamera);
stage.setScene(new Scene(root , 500, 500));
stage.setResizable(true);
stage.show();
}
Then just pass the imageView to your drawFrame method as needed.
Related
I am trying to create a transparent JFXPanel over a swing based UI. The problem is events are not forwarded through the "transparent" sections the way they are for normal swing components. I included a simple example below. Note that there are 3 layers, swing, swing, then the jfxpanel. If you comment out the
addItemToLayeredPanel(panel, createFXOverlay(), 7);
you can click both buttons even though they have jpanel layered above the bottom one. (Just demonstrating the effect works in swing only doesn't work with JFXPanel)
public class Main {
public static void main(String[] args) {
JFrame frame = new JFrame();
JLayeredPane panel = new JLayeredPane();
JButton button = new JButton("Push me");
JPanel overlay = createOverlay();
addItemToLayeredPanel(panel, button, 5);
addItemToLayeredPanel(panel, overlay, 6);
addItemToLayeredPanel(panel, createFXOverlay(), 7);
frame.getContentPane().add(panel);
frame.setSize(500, 500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private static JPanel createOverlay() {
JPanel panel = new JPanel();
panel.add(new JButton("on top"));
panel.setOpaque(false);
return panel;
}
private static JFXPanel createFXOverlay() {
JFXPanel panel = new JFXPanel();
BorderPane root = new BorderPane();
root.setStyle("-fx-background-color:transparent;");
root.setCenter(new Button("root"));
Scene scene = new Scene(root);
scene.setFill(javafx.scene.paint.Color.TRANSPARENT);
panel.setScene(scene);
panel.setOpaque(false);
return panel;
}
private static void addItemToLayeredPanel(JLayeredPane panel, JComponent item, int layer) {
item.setBounds(0,0,500,500);
panel.add(item);
panel.setLayer(item, layer);
}
}
Ideas? I tried a couple of ways of forwarding the events (generically) to jcomponents underneath, but I was unable to get it to work. I did find a couple of similar questions, but no solutions here and here
When Swings tries to see if a mouse event goes thru, it uses the JComponent method
public boolean contains(int x, int y) {
return (ui != null) ? ui.contains(this, x, y) : super.contains(x, y);
}
The problem is that JFXPanel, unlike other Swing components, does not define a ui ComponentUI. Therefore, the check falls back to the super.contains(x,y), which returns true if a mouse event happens within the bounds of the object.
The solution is to use a class that extends JFXPanel and overrides the contains method:
public class MyJFXPanel extends JFXPanel{
#Override
public boolean contains(int x, int y) { return false; }
}
Where false can be replaced by a more sophisticated statement, such as a pixel transparency condition.
The mouse events will then be automatically forwarded to the element underneat the MyJFXPanel.
I need to put a JME canvas into my app JPanel.
In the class with JME I init this:
public JmeCanvasContext ctx;
public Dimension dim = new Dimension(800, 600);
private void init() {
AppSettings settings = new AppSettings(true);
settings.setWidth(dim.width);
settings.setHeight(dim.height);
// settings.setRenderer(AppSettings.LWJGL_OPENGL1);
setSettings(settings);
createCanvas(); // create canvas!
ctx = (JmeCanvasContext) getContext();
ctx.setSystemListener(this);
ctx.getCanvas().setPreferredSize(dim);
startCanvas();
}
Then, in my main Window I create a JPanel (using NEtbeans designer tool) and add my jme canvas to the panel.
PanelDelAgente.add(agenteMolon.ctx.getCanvas());
But doesntwork. Is the first time that I use JME and I dont know very well how can I put it in a Jpanel
Thanks for your time!
In my case I use https://github.com/davidB/jme3_ext_swing
The question was also posted on the JME forum : https://hub.jmonkeyengine.org/t/putting-jme-canvas-into-jpanel-swing , with more answers.
So once again we are in the process of converting our existing Java application that was using entirely Swing to using JavaFX. However, the application will not be using JavaFX entirely. This seems to be causing some issues with Alerts/Dialogs and modality. We are currently using Java 8u40.
The main application is basically in a JFrame that has a Menu. The main content pane is JDesktopPane and clicking a MenuItem opens new JInternalFrames within the DeskopPane. Screens we are converting to JavaFX are basically JFXPanels within a JInternalFrame at the moment. Any Alerts/Dialogs that are opened from the JFXPanels are modal to the panel itself, but not to the JInternalFrame, DeskopPane, Menu, etc.
I read in the DialogPane documentation that they are planning to introduce some lightweight dialogs and even possibly InternalFrames in future releases of JavaFX, so maybe we'll just have to wait it out a little longer for this functionality. But, ideally when opening a new Alert/Dialog it would be modal to the entire Application.
EDIT:
Currently doing the following for modal dialogs:
((Stage)getDialogPane().getScene().getWindow()).setAlwaysOnTop(true);
This makes the dialog always appear on top, however the dialog also remains on top of other applications even if our main application is minimized. It also does not block input to any Swing components in the frame.
You can use the following work-around which creates an invisible JDialog when the Alert is shown and disposes the JDialog when the Alert is closed. This approach extends the modality to the whole application, including the Swing part.
// create Alert
Alert alert = new Alert(AlertType.INFORMATION, "Hello");
// create invisible JDialog and "show" it
JDialog dialog = new JDialog();
dialog.setModal(true);
dialog.setUndecorated(true);
dialog.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
SwingUtilities.invokeLater(() -> dialog.setVisible(true));
// show Alert
alert.showAndWait();
// close JDialog after Alert is closed
dialog.dispose();
I don't think i understand your question completely. But here is my guess - You are trying to make an alert window from some JFXPanel that will be modal (i.e. user will not be able to click in your application until she closes that alert window) to your entire application which is written partially using swing components.
If your application would be written in purely JavaFX then you would do something like (Assuming you have created a button somewhere in your JFXPanel)
button.setOnAction(evt -> {
Alert alert = new Alert(Alert.AlertType.INFORMATION);
alert.initModality(Modality.APPLICATION_MODAL);
// This will not work in your code
alert.initOwner(button.getScene().getWindow());
alert.show();
});
but since initOwner requires a javafx.stage.window object passing a swing component won't work in your code. As of Java 8u40 i don't think there is a right way(i.e. not hacks) to set ownership of Alert objects to swing component. Not surprisingly such questions has already been asked here and not answered as of writing this.
For your requirements you can use JOptionPane.showMessageDialog method and its look alike as workaround.
button.setOnAction(evt -> {
JOptionPane.showMessageDialog(desktopPane,"My message");
});
These dialog boxes are modal by default so no work is necessary. You can call these from any event handler methods of JavaFX components.
I've done a little workaround with a small interface which is implemented in my JavaFXFrame:
public interface DialogParent {
void setOnFocusGained(EventHandler<FocusEvent> focusHandler);
void setOnCloseRequest(EventHandler<WindowEvent> closeHandler);
}
And my JavaFXFrame implementation
public class JavaFXFrame implements DialogParent {
private JFrame frame;
private EventHandler<ch.irix.sumadmin.util.FocusEvent> focusGainedHandler;
private EventHandler<javafx.stage.WindowEvent> windowClosingHandler;
public void JavaFXFrame() {
final JFXPanel fxPanel = new JFXPanel();
frame = new JFrame();
frame.add(fxPanel);
frame.addWindowListener(new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
tryClosing(this);
}
});
frame.addWindowFocusListener(new WindowAdapter() {
#Override
public void windowGainedFocus(WindowEvent e) {
if (focusGainedHandler != null) {
focusGainedHandler.handle(new FocusEvent());
}
}
});
}
public void setVisible(boolean visible) {
frame.setVisible(visible);
}
private void tryClosing(WindowListener listener) {
javafx.stage.WindowEvent windowEvent = new javafx.stage.WindowEvent(null, javafx.stage.WindowEvent.WINDOW_CLOSE_REQUEST);
if (windowClosingHandler != null) {
windowClosingHandler.handle(windowEvent);
}
if (!windowEvent.isConsumed()) {
frame.setVisible(false);
}
}
#Override
public void setOnFocusGained(EventHandler<ch.irix.sumadmin.util.FocusEvent> focusGainedHandler) {
this.focusGainedHandler = focusGainedHandler;
}
#Override
public void setOnCloseRequest(EventHandler<javafx.stage.WindowEvent> windowClosingHandler) {
this.windowClosingHandler = windowClosingHandler;
}
}
And showing an Alert:
public static void showAlert(Alert alert) {
DialogPane dialogPane = alert.getDialogPane();
final Stage stage = new Stage();
stage.setScene(dialogPane.getScene());
List<ButtonType> buttonTypes = dialogPane.getButtonTypes();
for (ButtonType buttonType : buttonTypes) {
ButtonBase button = (ButtonBase) dialogPane.lookupButton(buttonType);
button.setOnAction(evt -> {
dialogPane.setUserData(buttonType);
stage.close();
});
}
dialogParent.setOnFocusGained(event -> {
stage.toFront();
});
dialogParent.setOnCloseRequest(Event::consume);
stage.setOnCloseRequest(event -> {
dialogParent.setOnFocusGained(null);
dialogParent.setOnCloseRequest(null);
});
stage.show();
}
Hope this will help you
I want to preface this question by stating that the following code works perfectly fine in JDK 1.7. The goal here is to create a tab pane with a tab at the end (with text set to "+") so that whenever this tab is selected, the program creates a new tab in the tab pane. This functionality works fine. The problem is that when you close the New Tab via the X, it switches to the "Add Tab," creates a new tab, then throws the following NullPointerException in some JDK code (and the app now shows TWO new tabs which are the same exact object):
Executing C:\Users\XXXXXX\Documents\NetBeansProjects\TestJavaFx\dist\run2082574567\TestJavaFx.jar using platform C:\Program Files\Java\jdk1.8.0\jre/bin/java
java.lang.NullPointerException
at com.sun.javafx.scene.control.skin.TabPaneSkin$TabHeaderSkin.access$302(TabPaneSkin.java:1040)
....
I have cut down the trouble code to bare minimums to display the issue, and it is as follows:
public class TestTabApp extends Application {
private TabPane tabPane;
private Tab addTab;
private Tab currentTab;
#Override
public void start(Stage primaryStage) {
//Create the tab pane and the 'addTab' for adding new tabs.
tabPane = new TabPane();
tabPane.setTabClosingPolicy(TabClosingPolicy.SELECTED_TAB);
addTab = new Tab("+");
addTab.setClosable(false);
tabPane.getTabs().add(addTab);
//Add a listener to listen for changes to tab selection.
tabPane.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<Tab>() {
#Override
public void changed(ObservableValue<? extends Tab> observable, Tab oldSelectedTab, Tab newSelectedTab) {
//If we change to the addTab create a
//new tab and change selection.
if (newSelectedTab == addTab) {
//Create the new tab.
createNewTab();
} else {
currentTab = newSelectedTab;
}
}
});
//Create a new tab for initial load of the app
createNewTab();
StackPane root = new StackPane();
root.getChildren().add(tabPane);
Scene scene = new Scene(root, 500, 500);
primaryStage.setTitle("Tab Test");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
private Tab createNewTab() {
Tab newTab = new Tab("New Tab");
newTab.setClosable(true);
tabPane.getTabs().add(tabPane.getTabs().size() - 1, newTab);
tabPane.getSelectionModel().select(newTab);
return newTab;
}
}
Does anyone have any thoughts on why this is happening now in JDK 1.8, but not in 1.7? Is there a bug in 1.8?
I also posted this on the Oracle forums and received a response from a David Grieve:
This is clearly a bug in the TabPaneSkin code. What seems to be happening is that the tab is removed before the tab removal animation completes. The problem may be exacerbated by the code automatically adding a tab if the last tab is removed, but the core code shouldn't fall over like that.
As a workaround, turn the tab close animation off with the following bit of CSS.
tabPane.setStyle("-fx-close-tab-animation: none;");
I have created https://javafx-jira.kenai.com/browse/RT-36443 to track the issue.
I am working with some strange legacy code. They have a custom object which implements a JPanel. This JPanel object is a secondary popup screen within the main application. The issue I'm having is to detect when the secondary popup screen is closed.
I tried to implement a WindowListener for the class, but when I try to add it, there is no JFrame associated with this object. I am assuming this is because they are using a custom object and it is an embedded popup screen.
I tried to retrieve a JFrame using:
JFrame parentFrame = (JFrame) SwingUtilities.getWindowAncestor(this);
which fails on a NullPointerException. I have no idea why it's so difficult to detect the right hand corner "x" close button on this page! I should mention that they were able to add Mouse and Key Listeners to the table which is embedded within the JPanel. But the outside listener for the entire window is causing me troubles.
(Please bear with me, this is my first stackoverflow post and I am new to Swing.)
Thanks so very much!!
Try to call getParent() for that strange panel. It should return the parent GUI component. If this is still not your frame but some intermediate panel instead, call getParent() on it as well. The top level component returns null.
Component p = strangePanel;
while ( p != null && ! (p instanceof Window))
p = p.getParent();
((Window) p ).addWindowListener(..);
Cannot understand why you are getting "NullPointerException" at:
JFrame parentFrame = (JFrame) SwingUtilities.getWindowAncestor(this);
In two cases this can happen:
JFrame parentFrame = (JFrame) SwingUtilities.getWindowAncestor(null);
In your case, this is not possible as you have used this as a parameter.
Second, are you doing some other operations in above code line, like:
JFrame parentFrame = ((JFrame) SwingUtilities.getWindowAncestor(this)).someOperation();
In this case, if your this object represent the top window then you are supposed to get "NullPointerException" because ancestor of top parent is returned as "null". In other cases, I suspect you will get this exception.
Can you post a block of code where you are getting exception.
For this answer I'm making a minor assumption that the Nullpointer is not being thrown at the line that you mentioned, but rather when you attempt to add the WindowListener to the parentFrame. This is most likely because you're calling
JFrame parentFrame = (JFrame) SwingUtilities.getWindowAncestor(this);
before the JPanel has been added to the JFrame hierarchy.
Here's a rought code sample on how you could work around this. The thought it to wait for the panel to be notified that it has been attached to the JFrame somewhere in its hierarchy.
package test;
import java.awt.event.HierarchyEvent;
import java.awt.event.HierarchyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class HierarchyTest extends JPanel {
protected static void loadApp() {
HierarchyTest test = new HierarchyTest();
JFrame frame = new JFrame();
frame.add(test);
frame.setSize(200, 200);
frame.setVisible(true);
}
/**
* #param args
*/
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
loadApp();
}
});
}
public HierarchyTest() {
this.addHierarchyListener(new HierarchyListener() {
#Override
public void hierarchyChanged(HierarchyEvent e) {
// This can be optimized by checking the right flags, but I leave that up to you to look into
boolean connected = setupListenersWhenConnected();
if (connected) {
HierarchyTest.this.removeHierarchyListener(this);
}
}
});
}
protected boolean setupListenersWhenConnected() {
JFrame parentFrame = (JFrame) SwingUtilities.getWindowAncestor(this);
if (parentFrame == null) {
return false;
}
parentFrame.addWindowListener(new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
// Implementation here
System.out.println("This window is closing!");
}
});
return true;
}
}