FAQ JavaFXConsultez toutes les FAQ

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public class Main extends Application { 
  
    @Override 
    public void start(Stage primaryStage) { 
        final Rectangle rectangle = new Rectangle(50, 50, 150, 100); 
        rectangle.setFill(Color.RED); 
        rectangle.setOnDragDetected(mouseEvent -> { 
            System.out.println("DnD detecté."); 
            final Dragboard dragBroard = rectangle.startDragAndDrop(TransferMode.COPY); 
            // Remlissage du contenu. 
            final ClipboardContent content = new ClipboardContent(); 
            // Exporter en tant que texte. 
            content.putString("Un rectangle rouge."); 
            // Exporter en tant que couleur ARGB. 
            DataFormat paintFormat = DataFormat.lookupMimeType(Paint.class.getName()); 
            paintFormat = (paintFormat == null) ? new DataFormat(Paint.class.getName()) : paintFormat; 
            final Color color = (Color) rectangle.getFill(); 
            final int red = (int) (255 * color.getRed()); 
            final int green = (int) (255 * color.getGreen()); 
            final int blue = (int) (255 * color.getBlue()); 
            final int alpha = (int) (255 * color.getOpacity()); 
            final int argb = alpha << 24 | red << 16 | green << 8 | blue << 0; 
            content.put(paintFormat, argb); 
            // Exporter en tant qu'image.        
            final WritableImage capture = rectangle.snapshot(null, null); 
            content.putImage(capture); 
            // 
            dragBroard.setContent(content); 
            mouseEvent.consume();         
        }); 
        final Pane root = new Pane(); 
        root.getChildren().setAll(rectangle); 
        final Scene scene = new Scene(root, 600, 600); 
        primaryStage.setTitle("Test de DnD"); 
        primaryStage.setScene(scene); 
        primaryStage.show(); 
    } 
  
    public static void main(String[] args) { 
        launch(args); 
    } 
}

final Object source = dragEvent.getGestureSource();

final Object source = dragEvent.getGestureTarget();

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final Circle circle = new Circle(250, 200, 50); 
circle.setFill(Color.BLUE); 
root.getChildren().add(circle);

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circle.setOnDragOver(dragEvent -> { 
    final Dragboard dragBroard = dragEvent.getDragboard(); 
    DataFormat paintFormat = DataFormat.lookupMimeType(Paint.class.getName()); 
    paintFormat = (paintFormat == null) ? new DataFormat(Paint.class.getName()) : paintFormat; 
    if (dragEvent.getGestureSource() != circle && dragBroard.hasContent(paintFormat)) { 
        // Indique les modes de transfert autorisés sur cette destination. 
        dragEvent.acceptTransferModes(TransferMode.COPY); 
    } 
    dragEvent.consume(); 
});

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circle.setOnDragDropped(dragEvent -> { 
    boolean success = false; 
    try { 
        final Dragboard dragBroard = dragEvent.getDragboard(); 
        DataFormat paintFormat = DataFormat.lookupMimeType(Paint.class.getName()); 
        paintFormat = (paintFormat == null) ? new DataFormat(Paint.class.getName()) : paintFormat; 
        final int argb = (Integer) dragBroard.getContent(paintFormat); 
        final double opacity = ((argb >> 24) & 0xFF) / 255.0; 
        final int red = (argb >> 16) & 0xFF; 
        final int green = (argb >> 8) & 0xFF; 
        final int blue = (argb >> 0) & 0xFF; 
        final Color fill = Color.rgb(red, green, blue, opacity); 
        circle.setFill(fill); 
        success = true; 
    } catch (Exception ex) { 
       [...] 
    } finally { 
        dragEvent.setDropCompleted(success); 
        dragEvent.consume(); 
    } 
});

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circle.setOnDragEntered(dragEvent -> { 
    final Dragboard dragBroard = dragEvent.getDragboard(); 
    DataFormat paintFormat = DataFormat.lookupMimeType(Paint.class.getName()); 
    paintFormat = (paintFormat == null) ? new DataFormat(Paint.class.getName()) : paintFormat; 
    if (dragEvent.getGestureSource() != circle && dragBroard.hasContent(paintFormat)) { 
        circle.setStroke(Color.GREEN); 
    } else { 
        circle.setStroke(Color.ORANGE); 
    } 
    circle.setStrokeWidth(10); 
    dragEvent.consume(); 
}); 
circle.setOnDragExited(dragEvent -> { 
    circle.setStroke(null); 
    circle.setStrokeWidth(0); 
    dragEvent.consume(); 
});

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source.setOnDragDone(dragEvent -> { 
    if (dragEvent.getTransferMode() == TransferMode.MOVE) { 
        // Faire ce qui est nécessaire pour retirer la source ou la donnée. 
        [...] 
    } 
    dragEvent.consume(); 
});

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try { 
    final File tempFile = File.createTempFile(String.format("export-%d", System.currentTimeMillis()), ".png"); 
    System.out.println(tempFile.getAbsolutePath()); 
    try (final OutputStream output = new FileOutputStream(tempFile)) { 
        final BufferedImage swingImage = SwingFXUtils.fromFXImage(fxImage, null); 
        ImageIO.write(swingImage, "png", output); 
        content.putFiles(Arrays.asList(tempFile)); 
        tempFile.deleteOnExit(); 
    } 
} catch (IOException ex) { 
    Logger.getLogger(TestDnD.class.getName()).log(Level.SEVERE, null, ex); 
}