Drag in TreeView

Hi all

I want to make a simple request where you have a tree and on the other side three pictures. In this example I used three rectangles each with a different color.

The user should be able to drag one of the rectangles of an item in the tree in order to add a new paragraph.

Everything works, the only problem I have is that I also can drop off anywhere in the entire tree 'frame '. I want that the user must release on

an element in the tree, not anywhere in the treeframe.

My second question is, can I also drag the entire image / rectangle instead of the standard small window box when a user tries to drag something? I read that

in JavaFX 8 would be possible, here you are able to transmit an entire image to the dragboard. My goal was to set the opacity of the rectangle enjoy 20% and then paste

the rectangle with the mouse, and if the user releases the mouse, the rectangle must return to its position of moose with full opacity. It would be a "nice to have", but

the first problem is unimportant.

This example should work out of the box:

package de.hauke.edi;

import java.io.IOException;

import de.cargosoft.edi.eservicemanager.Main3.ModuleTreeItem;
import javafx.animation.TranslateTransition;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.image.ImageView;
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.BorderPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Callback;
import javafx.util.Duration;

public class Main4 extends Application {

    @Override
    public void start(Stage primaryStage) throws IOException {

        BorderPane border = new BorderPane();
        Scene scene = new Scene(border, 700, 700);

        // setup tree
        TreeView<String> tree = new TreeView<String>();
        TreeItem<String> rootItem = new TreeItem<String>("Root");
        rootItem.setExpanded(true);
        for (int i = 1; i < 6; i++) {
            TreeItem<String> item = new TreeItem<String>("Node" + i);
            rootItem.getChildren().add(item);
        }
        tree.setRoot(rootItem);

        // setup boxes
        final Rectangle red = new Rectangle(100, 100);
        red.setFill(Color.RED);
        final Rectangle green = new Rectangle(100, 100);
        green.setFill(Color.GREEN);
        final Rectangle blue = new Rectangle(100, 100);
        blue.setFill(Color.BLUE);

        addDragFunction(red, "red");
        addDragFunction(green, "green");
        addDragFunction(blue, "blue");

        tree.setCellFactory(new Callback<TreeView<String>, TreeCell<String>>() {

            public TreeCell<String> call(TreeView<String> arg0) {
                final TreeCell<String> treeCell = new TreeCell<String>() {
                    protected void updateItem(String item, boolean empty) {
                        super.updateItem(item, empty);
                        if (item != null) {
                            setText(item);
                        }
                    }
                };

                treeCell.setOnDragOver(new EventHandler<DragEvent>() {
                    public void handle(DragEvent event) {
                        
                        event.acceptTransferModes(TransferMode.COPY_OR_MOVE);
                        
                        event.consume();
                    }
                });

                treeCell.setOnDragDropped(new EventHandler<DragEvent>() {
                    public void handle(DragEvent event) {
                        
                        Dragboard db = event.getDragboard();
                        if (db.hasString()) {
                            TreeItem<String> item = new TreeItem<String>("New "+db.getString() + " colored element dropped");
                            treeCell.getTreeItem().getChildren().add(item);
                            treeCell.getTreeItem().setExpanded(true);
                        }
                        event.consume();
                    }
                });

                return treeCell;
            }

        });

        // add elements to stage
        VBox vbox = new VBox();
        vbox.getChildren().add(red);
        vbox.getChildren().add(green);
        vbox.getChildren().add(blue);

        border.setLeft(tree);
        border.setRight(vbox);

        primaryStage.setScene(scene);
        primaryStage.show();

    }

    private void addDragFunction(final Rectangle control, final String code) {
        control.setOnDragDetected(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent event) {
                Dragboard db = control.startDragAndDrop(TransferMode.ANY);

                /* put a string on dragboard */
                ClipboardContent content = new ClipboardContent();
                content.putString(code);
                db.setContent(content);

                event.consume();
            }
        });

        control.setOnDragDone(new EventHandler<DragEvent>() {
            public void handle(DragEvent event) {
                event.consume();
            }
        });
    }

    public static void main(String[] args) {
        launch(args);
    }
}

Thanks for any help!

Everything works, the only problem I have is that I also can drop off anywhere in the entire tree 'frame '. I want that the user must release on

an element in the tree, not anywhere in the treeframe.

Just surround the code in methods of grip for your setOnDragOver and setOnDragDropped event handlers with

If (! treeCell.isEmpty ()) {...}

You could add more sense here if you need, for example to prevent the user from falling on the root or to limit the number of children has fallen on a single node.

For the JavaFX 8 image features with stretching, in your setOnDragDetected Manager, change the opacity, create an image of the control by calling snapshot() and pass the image to the setDragView (...) method of the Dragboard. In the setOnDragDone Manager, resume the opacity.

Tags: Java

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