Drag and drop files with JavaFX

Contents

A program that displays the absolute path of a file when it is dragged and dropped.

code

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
			VBox root = new VBox();

			root.setOnDragOver(event -> {
				Dragboard board = event.getDragboard();
				if (board.hasFiles()) {
					event.acceptTransferModes(TransferMode.MOVE);
				}
			});

			root.setOnDragDropped(event -> {
				Dragboard board = event.getDragboard();
				if (board.hasFiles()) {
					board.getFiles().forEach(file -> {
						root.getChildren().add(new Label(file.getAbsolutePath()));
						System.out.println(file.getAbsolutePath());
					});

					event.setDropCompleted(true);
				} else {
					event.setDropCompleted(false);
				}
			});

			Scene scene = new Scene(root, 400, 400);
			primaryStage.setScene(scene);
			primaryStage.show();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

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

Supplement

You need a description to call ʻacceptTransferModes in the setOnDragOver` method just by dragging and dropping the file. It doesn't work without it.