FXML BorderPane centered inside another BorderPane

Question

So, I've been trying to center a BorderPane inside another BorderPane (center part), but so far without success.

I've tried (both in the Pane loaded from FXML and parent Scene):

SetPadding
setMargin
Using an AnchorPane and setting Top, bottom, left and right anchors
Adding Regions to the top and left of the main BorderPane (ineffective and does not work when resizing the Stage)

If I use anything other than a Pane or Node to load the FXML

Pane pane = loader.load();

Like an HBox, VBox, AnchorPane, or Group the FXML does not load;

Current layout:

Result that I'm looking for (roughly)

The idea is even when I resize the window, the FXML layout will stay in the center of the MainBorderPane;

Red border: Stage -> Scene -> BorderPane Blue border: BorderPane loaded through FXML in the method showNewScene(FXMLPath)

(source code for simulation: package sample)

Main.java

package sample;


import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class Main extends Application {

    private static BorderPane mainBorderPane;
    private static Scene mainScene;
    private static MenuBar mainMenuBar;
    private static Stage mainStage;

    private static Menu mainMenuFile;
    private static MenuItem mainItemMenuLock;
    private static MenuItem mainItemMenuClose;
    private static Menu mainMenuHelp;
    private static MenuItem mainItemMenuSupport;

    public static BorderPane getMainBorderPane() {
        if (mainBorderPane == null) {
            mainBorderPane = new BorderPane();
        }
        return mainBorderPane;
    }

    public static Scene getMainScene() {
        if (mainScene == null) {
            mainScene = new Scene(getMainBorderPane(), 800, 600);
        }
        return mainScene;
    }

    public static MenuBar getMainMenuBar() {
        if (mainMenuBar == null) {
            mainMenuBar = new MenuBar();

            mainMenuFile = new Menu("File");
            mainItemMenuLock = new MenuItem("Lock Screen");
            mainItemMenuClose = new MenuItem("Close");
            mainMenuFile.getItems().addAll(mainItemMenuLock, mainItemMenuClose);

            mainMenuHelp = new Menu("Help");
            mainItemMenuSupport = new MenuItem("Support");
            mainMenuHelp.getItems().addAll(mainItemMenuSupport);

            mainMenuBar.getMenus().addAll(mainMenuFile, mainMenuHelp);

        }
        return mainMenuBar;
    }

    public static Stage getMainStage() {
        if (mainStage == null) {
            getMainBorderPane().setTop(getMainMenuBar());
            mainStage = new Stage(StageStyle.DECORATED);
        }

        return mainStage;
    }

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

    @Override
    public void init() {
        //
    }

    @Override
    public void start(final Stage initStage) throws Exception{
            UtilMethods.showNewScene("login.fxml");
    }

}

UtilMethods.java

package sample;

import javafx.fxml.FXMLLoader;
import javafx.geometry.Pos;
import javafx.scene.layout.Pane;

public class UtilMethods {

    public static void showNewScene(String fxmlPath) {
        try {

            FXMLLoader loader = new FXMLLoader(UtilMethods.class.getResource(fxmlPath));
            Pane pane = loader.load();
            Main.getMainBorderPane().setCenter(pane);
            Main.getMainBorderPane().setAlignment(pane, Pos.CENTER);

           Main.getMainStage().setScene(Main.getMainScene());
            Main.getMainStage().setAlwaysOnTop(false);
            Main.getMainStage().setResizable(true);
            Main.getMainStage().show();


        }catch (java.io.IOException e){
            System.out.println("Error loading screen" + e.getMessage());
        }
    }
}

LoginController.java

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;

public class LoginController {

    @FXML private TextField userIdField;

    @FXML private PasswordField passwordField;

    public void initialize(){
            //
        }

    @FXML
    private void login(ActionEvent event) {
        System.out.println("login");
    }

    @FXML
    private void cancel(){
        userIdField.clear();
        passwordField.clear();
        userIdField.requestFocus();
    }

    @FXML
    private void registerNew(ActionEvent event) throws Exception{
        System.out.println("register new");
    }

}

login.fxml

Gus · Accepted Answer

As James_D said in the comments:

Add an alignment="CENTER" attribute to the GridPane root element in the FXML.

FXML BorderPane centered inside another BorderPane

Answers (2)

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