JavaFX如何改变阶段

Posted 2023-02-26

【中文标题】JavaFX如何改变阶段

【英文标题】：JavaFX how to change stage

【发布时间】：2012-10-11 18:49:15

【问题描述】：

我正在使用带有 Scene Builder 1.0 的 Netbeans 7.2 来开发 JavaFX 应用程序。我已经设置了主屏幕，我想拥有它，所以我单击一个按钮，它将关闭主窗口并打开另一个。主 Stage 对象位于主类中，但控制器类是独立的，并且无法访问它，因为它不是静态的并且在不同的类中。如何改变场景或舞台？

【参考方案1】：

根据您的问题，最近我正在为 JavaFX 开发一个 ios 等效 NavigationController，使用推送和关闭视图的最简单想法。

让我把代码分享给社区：https://github.com/jalopezsuarez/javafx-screens

这个想法是有一个非常简单的环境来帮助您在屏幕之间切换。

希望对你有帮助。

【参考方案2】：

我可能在这里说类似的话，但这就是我的做法：

（在此示例中，我正在从 Login.fxml 转换为 Home.fxml）。

在 LoginController.fxml 类中，我创建了以下方法：

@FXML
private void login(javafx.event.ActionEvent event) throws IOException

    if(pwf1.getText().equals("dolphin"))
    
            Parent blah = FXMLLoader.load(getClass().getResource("Home.fxml"));
            Scene scene = new Scene(blah);
            Stage appStage = (Stage) ((Node) event.getSource()).getScene().getWindow();
            appStage.setScene(scene);
            appStage.show();
    
    else
    
            label1.setText("Password is incorrect. Please Try Again");
    

就是这样。;)

【参考方案3】：

Download JavaFX samples 找到项目 FXML-LoginDemo ，这就是你需要的。为了快速参考，我在这里复制粘贴主要的 java 类；）

/*
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
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 *    from this software without specific prior written permission.
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package demo;

import demo.model.User;
import demo.security.Authenticator;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.fxml.JavaFXBuilderFactory;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

/**
 * Main Application. This class handles navigation and user session.
 */
public class App extends Application 
    private Stage stage;
    private User loggedUser;

    private static App instance;

    public App() 
        instance = this;
    

    public static App getInstance() 
        return instance;
    

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

    @Override public void start(Stage primaryStage) 
        try 
            stage = primaryStage;
            gotoLogin();
            primaryStage.show();
         catch (Exception ex) 
            Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
        
    

    public User getLoggedUser() 
        return loggedUser;
    

    public boolean userLogging(String userId, String password)
        if (Authenticator.validate(userId, password)) 
            loggedUser = User.of(userId);
            gotoProfile();
            return true;
         else 
            return false;
        
    

    public void userLogout()
        loggedUser = null;
        gotoLogin();
    

    private void gotoProfile() 
        try 
            replaceSceneContent("profile.fxml");
         catch (Exception ex) 
            Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
        
    

    private void gotoLogin() 
        try 
            replaceSceneContent("login.fxml");
         catch (Exception ex) 
            Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
        
    

    private Parent replaceSceneContent(String fxml) throws Exception 
        Parent page = (Parent) FXMLLoader.load(App.class.getResource(fxml), null, new JavaFXBuilderFactory());
        Scene scene = stage.getScene();
        if (scene == null) 
            scene = new Scene(page, 700, 450);
            scene.getStylesheets().add(App.class.getResource("demo.css").toExternalForm());
            stage.setScene(scene);
         else 
            stage.getScene().setRoot(page);
        
        stage.sizeToScene();
        return page;
    

【讨论】：

谢谢，这正是我想要的！

现在正确吗？我的意思是，我可以使用它并在 App 类之外调用 .replaceSceneContent 吗？或今天（2015 年）是否有正确的方法来进行阶段之间的更改？谢谢 =)

如何在 Controller 类中使用它？或者我可以只在主应用程序中使用它吗？

这个答案很旧，今天已经过时了:(

【参考方案4】：

你也可以这样做：

这样修改你的controller.java

Stage thisStage;

public void setStage (Stage stage)
    thisStage = stage;


public void showStage()
    thisStage.setTitle("Titel in der MainController.java geändert");
    thisStage.show();

请务必不要在初始化方法中使用 thisStage。

以这种方式修改您的 Mainclass：

@Override
public void start(Stage stage) throws Exception 
    URL location = getClass().getResource("Main.fxml");
    FXMLLoader fxmlLoader = new FXMLLoader();
    fxmlLoader.setLocation(location);
    fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
    Parent root = (Parent) fxmlLoader.load(location.openStream());
    Scene scene = new Scene(root);
    stage.setScene(scene);
    MainController mainController = fxmlLoader.getController();
    mainController.setStage(stage);
    mainController.showStage();

您可以下载示例项目（netbeans）here。

【讨论】：

链接失效了，能不能再给一个？