JavaFX StackPane/group阻止我调整屏幕大小

我不能让它调整大小，它总是为每个屏幕的首选大小。这对于全屏应用程序并不理想。它基本上变成了左上角的一个小盒子=

我已经花了好几天时间在这上面了，但都没法让它发挥作用

谁能告诉我我做错了什么？谢谢

主要类别：

public class Main extends Application {

public static final String MAIN_SCREEN = "main"; 
public static final String MAIN_SCREEN_FXML = "../gui/main.fxml"; 
public static final String CUSTOMER_SCREEN = "customer_main"; 
public static final String CUSTOMER_SCREEN_FXML = "../gui/customer_main.fxml"; 





@Override
public void start(Stage primaryStage) {

    primaryStage.setFullScreen(true);
    primaryStage.centerOnScreen();
    ScreensController mainContainer = new ScreensController();      
       mainContainer.loadScreen(Main.MAIN_SCREEN, 
                            Main.MAIN_SCREEN_FXML); 
       mainContainer.loadScreen(Main.CUSTOMER_SCREEN, 
               Main.CUSTOMER_SCREEN_FXML); 
       mainContainer.setScreen(Main.MAIN_SCREEN); 
       Group root = new Group(); 

       root.getChildren().addAll(mainContainer); 
       Scene scene = new Scene(root);
       primaryStage.setScene(scene); 
       primaryStage.show(); 
       mainContainer.requestLayout();

}

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

第一个屏幕控制器类具有FXML文件：

public class MainScreenController implements ControlledScreen, Initializable{

ScreensController myController;

@FXML
private VBox mainScreen;


@FXML
private void mainScreenClicked(){
    myController.setScreen(Main.CUSTOMER_SCREEN);
}

@Override
public void initialize(URL arg0, ResourceBundle arg1) {

}

@Override
public void setScreenParent(ScreensController screenParent) {       
    myController = screenParent; 
}

public class CustomerMenuController implements ControlledScreen, Initializable {


    ScreensController myController;
    @FXML 
    private FlowPane customerMenuFlow;

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        for (int i = 0; i < 3;i++){
            new Customer();
        }
        Button [] menuButtons = new Button[Customer.customers.size()];
        for (int i = 0; i < Customer.customers.size();i++){
            menuButtons[i] = new Button("Customer " + i);

            customerMenuFlow.getChildren().add(menuButtons[i]);

        }


    }

    @Override
    public void setScreenParent(ScreensController screenParent) {
        myController = screenParent; 
    }



}

堆栈窗格，以获得良好的布局：

    public class ScreensController extends StackPane {

    public ScreensController(){

    }


    private HashMap<String, Node> screens = new HashMap<>();

     public void addScreen(String name, Node screen) { 
           screens.put(name, screen); 
       } 

     public boolean loadScreen(String name, String resource) { 
         try { 
           FXMLLoader myLoader = new FXMLLoader(getClass().getResource(resource));   
           Parent loadScreen = (Parent) myLoader.load();
           ControlledScreen myScreenControler = 
                  ((ControlledScreen) myLoader.getController()); 

           myScreenControler.setScreenParent(this); 
           addScreen(name, loadScreen); 
           return true;

         }catch(Exception e) { 
           System.out.println(e.getMessage()); 
           e.printStackTrace();
           return false; 
         } 
       } 

     public boolean setScreen(final String name) { 

         if(screens.get(name) != null) { //screen loaded 
           final DoubleProperty opacity = opacityProperty(); 
           //Is there is more than one screen 

           if(!getChildren().isEmpty()){ 
             Timeline fade = new Timeline( 
               new KeyFrame(Duration.ZERO, 
                            new KeyValue(opacity,1.0)), 
               new KeyFrame(new Duration(1000), 

                   new EventHandler() { 

                     @Override 
                     public void handle(Event t) { 
                       //remove displayed screen 
                       getChildren().remove(0); 
                       //add new screen 
                       getChildren().add(0, screens.get(name)); 
                       Timeline fadeIn = new Timeline( 
                           new KeyFrame(Duration.ZERO, 
                                  new KeyValue(opacity, 0.0)), 
                           new KeyFrame(new Duration(800), 
                                  new KeyValue(opacity, 1.0))); 
                       fadeIn.play(); 
                     }


                   }, new KeyValue(opacity, 0.0))); 
             fade.play(); 
           } else { 
             //no one else been displayed, then just show 
             setOpacity(0.0); 
             getChildren().add(screens.get(name)); 
             Timeline fadeIn = new Timeline( 
                 new KeyFrame(Duration.ZERO, 
                              new KeyValue(opacity, 0.0)), 
                 new KeyFrame(new Duration(2500), 
                              new KeyValue(opacity, 1.0))); 
             fadeIn.play(); 
           } 
           return true; 
         } else { 
             System.out.println("screen hasn't been loaded!\n"); 
             return false; 
       } 
}
     public boolean unloadScreen(String name) { 
         if(screens.remove(name) == null) { 
           System.out.println("Screen didn't exist"); 
           return false; 
         } else { 
           return true; 
         } 
       } 

验证stackpane是否具有FXML文件的第二个控制器类：

public class MainScreenController implements ControlledScreen, Initializable{

ScreensController myController;

@FXML
private VBox mainScreen;


@FXML
private void mainScreenClicked(){
    myController.setScreen(Main.CUSTOMER_SCREEN);
}

@Override
public void initialize(URL arg0, ResourceBundle arg1) {

}

@Override
public void setScreenParent(ScreensController screenParent) {       
    myController = screenParent; 
}

public class CustomerMenuController implements ControlledScreen, Initializable {


    ScreensController myController;
    @FXML 
    private FlowPane customerMenuFlow;

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        for (int i = 0; i < 3;i++){
            new Customer();
        }
        Button [] menuButtons = new Button[Customer.customers.size()];
        for (int i = 0; i < Customer.customers.size();i++){
            menuButtons[i] = new Button("Customer " + i);

            customerMenuFlow.getChildren().add(menuButtons[i]);

        }


    }

    @Override
    public void setScreenParent(ScreensController screenParent) {
        myController = screenParent; 
    }



}

您不应该使用primaryStage.setFullScreentrue；用于可调整大小的应用程序。无论如何，在这种情况下是不行的。删除该行后，应用程序将以其首选大小开始，但用户可以拖动窗口的角来调整应用程序的大小