使用 JavaFX 8 对显示 FXML 执行操作

Question

我正在构建一个具有多个屏幕的 JavaFX 应用程序，因此具有多个 FXML 文件及其控制器。当应用程序启动所有 FXML 文件时，控制器的初始化方法已经完成。

我有一个锁屏，用户需要输入密码才能进入下一个屏幕。当密码正确时，检索员工姓名并加载主菜单屏幕。

我想将用户名传递给主菜单屏幕中的标签，但我不能使用控制器的初始化方法，因为它已经被调用了。

有没有办法在显示 FXML 屏幕时执行操作，使我能够在控制器之间传递字符串？

非常感谢任何帮助！

ps。如果您想查看代码，请在下方评论。

编辑（为了更好地理解）

您可以在下面找到代码：

Main.java

public class Main extends Application {

public static String screen1ID = "loginscherm";
public static String screen1File = "Lockscreen.fxml";
public static String screen2ID = "mainmenu";
public static String screen2File = "MainMenu.fxml";
//public static String screen3ID = "screen3";
//public static String screen3File = "Screen3.fxml";
public static Functions databaseConnection;

@Override
public void start(Stage stage) throws Exception {

    databaseConnection = new Functions();
    databaseConnection.DB_Connect();

    octocash.GUI_Screens.ScreensController mainContainer = new octocash.GUI_Screens.ScreensController();
    mainContainer.loadScreen(Main.screen1ID, Main.screen1File);
    mainContainer.loadScreen(Main.screen2ID, Main.screen2File);

    mainContainer.setScreen(Main.screen1ID);

    Group root = new Group(); //als je meerdere vensters in moet laden
    root.getChildren().addAll(mainContainer);
    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.setFullScreen(true); //full screen without borders (no program menu bars)
    stage.setFullScreenExitHint(""); //Don't show "Press ESC to exit full screen"
    //stage.setFullScreenExitKeyCombination(KeyCombination.NO_MATCH); //NIET AANZETTEN VOOR JE IETS ANDERS GEMAAKT HEBT ZODAT JE ERUIT KUNT
    stage.show();
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    launch(args);
}   
}

LockscreenController.java

public class LockscreenController implements Initializable, ControlledScreen {

ScreensController myController;

@FXML
private PasswordField passwordField;
public FlowPane mainContent;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

@Override
public void initialize(URL url, ResourceBundle rb) {
    mainContent.setPrefSize(screenSize.getWidth(), screenSize.getHeight());
}

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

@FXML
private void goToMainMenu(){
   myController.setScreen(octocash.Main.screen2ID); 
}

public static String employeeName;
public static String employeeIsAdmin;

@FXML
private void checkPassword(ActionEvent event){
   String input = passwordField.getText();
   String needsToBeChecked;
   needsToBeChecked = (new octocash.Functions()).hashPassword(input);
   String[][] employeeInfo = octocash.Main.databaseConnection.getData("some_query", Arrays.asList("naam","isAdmin"));

   if(employeeInfo[0][0] != null) {
       employeeName = employeeInfo[0][0];
       employeeIsAdmin = employeeInfo[0][1];
       goToMainMenu();
       passwordField.setText("");
   }
   else{
       passwordField.setText("");
   } 
}   
}

MainMenuController.java

public class MainMenuController implements Initializable, ControlledScreen {

ScreensController myController;

public FlowPane mainContent;
public ToolBar toolBar;
public Region spacerToolbar;
public HBox buttonHolder;
public Button exitButton;
public Label currentlyLoggedIn;
public Button testButton;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

@Override
public void initialize(URL url, ResourceBundle rb) {
    mainContent.setPrefSize(screenSize.getWidth(), screenSize.getHeight());
    toolBar.setMinWidth(screenSize.getWidth());
    buttonHolder.setHgrow(spacerToolbar, Priority.ALWAYS); //Align buttonHolder to the right
}

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

@FXML
private void exitApplication(){
    Stage stage = (Stage) exitButton.getScene().getWindow();
    stage.close();
} 
}

现在：我想从 LockscreenController 获取 employeeName 的值并将其发送到 MainMenuController，而不使用初始化方法。

Answer 1

你必须找到一种方法来链接它们之间的控制器，或者只是必须能够访问其他控制器的控制器，你必须实现一个类似的方法

mainController.refreshMainMenuLabel(User user)

所以当用户登录时，该控制器将调用 mainController 的 refreshMainMenuLabel

编辑

我会给你一个带有 2 个控制器的例子

第一次定义 AppContext

 public static class AppContext{

            //you can add the controllers by their variables 
            private Controller1 test1;
            private Controller2 test2;

            //or from a list which will require handling , but it will be more dynamic
              private List<Controller> controllers;
            private static AppContext context=null;
            //You make the constructor private so its really a sigleton ,
            //cause noone can access it from outer package
            private AppContext()
            {

            }

           public static AppContext getAppContext(){
               if(context==null)
                      context=new AppContext();
               return context;
           }

           public void setController1(Controller1 e)
           {
               test1=e;
           }

           public void setController2(Controller2 e)
           {
               test2=e;
           }

           public Controller1 getController1()
           {
               return test1;
           }

           public Controller2 getController2()
           {
               return test2;
           }  

        }

所以这些方法可以像 AppContext.getAppContext().getController1() 一样从应用程序的任何地方调用，因为 getAppcontext 是静态的， 如果您有任何问题，请告诉我