import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.DatePicker;
import javafx.scene.control.TextField;
import javafx.scene.input.*;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

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

    @Override
    public void start(Stage stage) throws Exception {
        stage.setScene(createScene());
        stage.show();
    }

    private Scene createScene() {
        DatePicker datePicker = new DatePicker();
        initSource(datePicker);
        TextField textField = new TextField();
        initSource(textField);

        VBox sourceContainer = new VBox(5);
        sourceContainer.getChildren().add(datePicker);
        sourceContainer.getChildren().add(textField);

        Button target = new Button("Target");
        initTarget(target);

        HBox root = new HBox(10);
        root.getChildren().add(sourceContainer);
        root.getChildren().add(target);
        return new Scene(root, 400, 300);
    }

    private void initTarget(final Node node) {
//        node.setOnDragEntered(new EventHandler<DragEvent>() {
//            public void handle(DragEvent event) {
//
//            }
//        });
        node.setOnDragOver(new EventHandler<DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                Dragboard db = event.getDragboard();
                event.acceptTransferModes(TransferMode.ANY);
                System.out.println("DragOver");
            }
        });

        node.setOnDragDropped(new EventHandler<DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                System.out.println("DragDropped");
                Dragboard db = event.getDragboard();
                event.setDropCompleted(true);
            }
        });
    }

    private void initSource(final Node node) {
        node.setOnDragDetected(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                Dragboard db = node.startDragAndDrop(TransferMode.COPY);
                if (db == null) {
                    return;
                }

                ClipboardContent content = new ClipboardContent();
                content.putString("STRING");

                db.setContent(content);
                event.consume();
            }
        });

        node.setOnDragDone(new EventHandler<DragEvent>() {
            @Override
            public void handle(DragEvent event) {
                System.out.println("DragDone");
            }
        });
    }
}