Main.java

package application;

import java.io.IOException;
import java.util.prefs.BackingStoreException;
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.fxml.FXMLLoader;

public class Main extends Application {

    double x, y;

    private void addDragListeners(final Node n, Stage primaryStage) {

        n.setOnMousePressed((mouseEvent) -> {
            this.x = n.getScene().getWindow().getX() - mouseEvent.getScreenX();
            this.y = n.getScene().getWindow().getY() - mouseEvent.getScreenY();
        });

        n.setOnMouseDragged((mouseEvent) -> {
            primaryStage.setX(mouseEvent.getScreenX() + this.x);
            primaryStage.setY(mouseEvent.getScreenY() + this.y);
        });
    }

    @Override
    public void start(Stage primaryStage) {
        try {

            Pane root = (Pane) FXMLLoader.load(getClass().getResource("FX.fxml"));
            Scene scene = new Scene(root, 463, 198);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());

            Rectangle rect = new Rectangle(463, 198);
            rect.setArcHeight(10);
            rect.setArcWidth(10);
            root.setClip(rect);
            primaryStage.setScene(scene);
            primaryStage.initStyle(StageStyle.TRANSPARENT);
            scene.setFill(Color.TRANSPARENT);
            addDragListeners(root, primaryStage);
            primaryStage.show();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws IOException, InterruptedException, BackingStoreException {

        settings.UserPreferences.getPreferences();
        launch(args);

    }
}