Change the position of the pane in a Voletfractionne

It is a simple code for Voletfractionne field

import javafx.application.Application;
import javafx.geometry.Orientation;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.SplitPane;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;


/**
*
* @author utente
*/
public class SplitPaneDragAndDrop extends Application {
   
    @Override
    public void start(Stage primaryStage) {
              
        Pane root = new Pane();
        SplitPane sp = new SplitPane();
        sp.setPrefSize(800, 650);
       
        Pane one = new Pane();
        Pane two = new Pane();
        Pane three = new Pane();
        Pane four = new Pane();
       
        Label first = new Label(" Pane One");
        Label second = new Label(" Pane Two");
        Label third = new Label(" Pane Three");
       
        two.getChildren().add(first);
        three.getChildren().add(second);
        four.getChildren().add(third);
       
        sp.setDividerPositions(0.5f, 0.65f, 0.8f);
       
        sp.getItems().addAll(one, two, three, four);
        sp.setVisible(true);
        sp.setOrientation(Orientation.VERTICAL);
       
        root.getChildren().add(sp);
       
        Scene scene = new Scene(root, 800, 650);
       
        primaryStage.setTitle("SplitPane dragging test");
        primaryStage.setScene(scene);
        primaryStage.show();
    }


    /**
     * The main() method is ignored in correctly deployed JavaFX application.
     * main() serves only as fallback in case the application can not be
     * launched through deployment artifacts, e.g., in IDEs with limited FX
     * support. NetBeans ignores main().
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }  
}

I would like to know if it is possible to change the position of the left pane of the mouse and drag the: in the example, let's suppose I want to change position in a stream with three pane by click and drag over the area of the pane, is it possible?

How to get there?

Thank you

It is probably more useful to you look at the FlowPane code and to find a way to change it to do what you want. You'll learn more that way.

It is essentially if you can't get there. There is a little quirk with the positions of the divider; not very well why, but you can experiment with it.

import java.util.Arrays;

import javafx.application.Application;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.geometry.Orientation;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.SplitPane;
import javafx.scene.input.ClipboardContent;
import javafx.scene.input.DragEvent;
import javafx.scene.input.Dragboard;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.TransferMode;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

/**
*
* @author utente
*/
public class SplitPaneDragAndDrop extends Application {

    private static final String SPLIT_PANE_DRAG_ITEM = "SplitPaneItem";

    @Override
    public void start(Stage primaryStage) {

        Pane root = new Pane();
        SplitPane sp = new SplitPane();
        sp.setPrefSize(800, 650);

        final ObjectProperty currentlyDraggedPane = new SimpleObjectProperty<>();

        Pane one = createPane(currentlyDraggedPane, sp);
        Pane two = createPane(currentlyDraggedPane, sp);
        Pane three = createPane(currentlyDraggedPane, sp);
        Pane four = createPane(currentlyDraggedPane, sp);

        Label first = new Label(" Pane One");
        Label second = new Label(" Pane Two");
        Label third = new Label(" Pane Three");

        two.getChildren().add(first);
        three.getChildren().add(second);
        four.getChildren().add(third);

        sp.setDividerPositions(0.5f, 0.65f, 0.8f);

        sp.getItems().addAll(one, two, three, four);
        sp.setVisible(true);
        sp.setOrientation(Orientation.VERTICAL);

        root.getChildren().add(sp);

        Scene scene = new Scene(root, 800, 650);

        primaryStage.setTitle("SplitPane dragging test");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private Pane createPane(final ObjectProperty currentlyDraggedPane,
            final SplitPane splitPane) {
        final Pane pane = new Pane();
        pane.setOnDragDetected(new EventHandler() {
            @Override
            public void handle(MouseEvent event) {
                Dragboard dragboard = pane.startDragAndDrop(TransferMode.MOVE);
                ClipboardContent content = new ClipboardContent();
                content.putString(SPLIT_PANE_DRAG_ITEM);
                dragboard.setContent(content);
                currentlyDraggedPane.set(pane);
                event.consume();
            }
        });
        pane.setOnDragOver(new EventHandler() {
            @Override
            public void handle(DragEvent event) {
                Dragboard dragboard = event.getDragboard();
                if (dragboard.hasString()
                        && SPLIT_PANE_DRAG_ITEM.equals(dragboard.getString())
                        && currentlyDraggedPane.get() != null
                        && currentlyDraggedPane.get() != pane) {
                    event.acceptTransferModes(TransferMode.MOVE);
                    event.consume();
                }
            }
        });
        pane.setOnDragDropped(new EventHandler() {
            @Override
            public void handle(DragEvent event) {
                Dragboard dragboard = event.getDragboard();
                Pane incomingPane = currentlyDraggedPane.get();
                if (dragboard.hasString()
                        && SPLIT_PANE_DRAG_ITEM.equals(dragboard.getString())
                        && incomingPane != null && incomingPane != pane) {

                    ObservableList items = splitPane.getItems();
                    int indexOfIncomingPane = items.indexOf(incomingPane);
                    int myIndex = items.indexOf(pane);

                    double[] dividerPositions = splitPane.getDividerPositions();

                    // Swap items, being careful to remove both before adding
                    // both back.
                    // Doing this in the wrong order will violate rules of the
                    // Scene graph.

                    int rightIndex = Math.max(indexOfIncomingPane, myIndex);
                    int leftIndex = Math.min(indexOfIncomingPane, myIndex);
                    Node rightNode = items.remove(rightIndex);
                    Node leftNode = items.remove(leftIndex);
                    items.add(leftIndex, rightNode);
                    items.add(rightIndex, leftNode);

                    // Maybe do something more sophisticated here to maintain
                    // original relative
                    // sizes of each pane
                    splitPane.setDividerPositions(dividerPositions);
                }
            }
        });
        return pane;
    }

    /**
     * The main() method is ignored in correctly deployed JavaFX application.
     * main() serves only as fallback in case the application can not be
     * launched through deployment artifacts, e.g., in IDEs with limited FX
     * support. NetBeans ignores main().
     *
     * @param args
     *            the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}

Tags: Java

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Change the position of the pane in a Voletfractionne

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