JavaFX - 如何使用JavaFX BorderPane来布局控件

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
  public static void main(String[] args) {
    Application.launch(args);
  }

  public void start(Stage stage) {
    Node top = null;
    Node left = null;

    VBox center = getCenter();

    Button okBtn = new Button("Ok");
    Button cancelBtn = new Button("Cancel");

    okBtn.setMaxWidth(Double.MAX_VALUE);
    VBox right = new VBox(okBtn, cancelBtn);
    right.setStyle("-fx-padding: 10;");

    Label statusLbl = new Label("Status: Ready");
    HBox bottom = new HBox(statusLbl);
    BorderPane.setMargin(bottom, new Insets(10, 0, 0, 0));

    BorderPane root = new BorderPane(center, top, right, bottom, left);

    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
  }

  private VBox getCenter() {
    Label nameLbl = new Label("Name:");
    TextField nameFld = new TextField();
    HBox.setHgrow(nameFld, Priority.ALWAYS);
    HBox nameFields = new HBox(nameLbl, nameFld);

    Label descLbl = new Label("Description:");
    TextArea descText = new TextArea();
    descText.setPrefColumnCount(20);
    descText.setPrefRowCount(5);
    VBox.setVgrow(descText, Priority.ALWAYS);

    VBox center = new VBox(nameFields, descLbl, descText);
    return center;
  }
}