JavaFX 改变场景不工作

Question

我正在尝试在 JavaFX 中切换场景。到目前为止，我已经创建了 3 个场景 - 登录屏幕、个人资料和注册。出于某种原因，我无法从登录屏幕切换到配置文件。登录屏幕中的 "Register" 按钮以及注册屏幕中的 "Back" 按钮正在工作。单击 "Log in" 按钮时，没有任何反应。我错过了什么？这是主要的 class:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import jedzenie.windows.LogInScreen;
import jedzenie.windows.ProfileInfoScreen;
import jedzenie.windows.RegisterScreen;


public class App extends Application
{

    Stage stage;
    Scene scene, scLogIn;
    LogInScreen logInScreen;
    RegisterScreen regis;
    ProfileInfoScreen profileScreen;

    @Override
    public void start(Stage primaryStage){
        primaryStage.setTitle("FoodCalc");
        stage = primaryStage;


        logInScreen = new LogInScreen(this);
        scLogIn = new Scene(logInScreen, 400, 400);
        scLogIn.getStylesheets().add(getClass().getResource("logInScreen.css").toExternalForm());
        primaryStage.setScene(scLogIn);

        primaryStage.show();

    }


    public void moveToRegisterScreen(){
        regis = new RegisterScreen(this);
        Scene scRegister = new Scene(regis, 575, 250);
        scRegister.getStylesheets().add(getClass().getResource("registerScreen.css").toExternalForm());
        stage.setScene(scRegister);
    }


    public void logOut(){
        stage.setScene(scLogIn);
    }


    public void logIn(){
        profileScreen = new ProfileInfoScreen(this);
        Scene scProfile = new Scene(profileScreen, 500, 400);
        scProfile.getStylesheets().add(getClass().getResource("registerScreen.css").toExternalForm());
        stage.setScene(scProfile);

    }


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


}

登录屏幕class:

import javafx.event.ActionEvent;
import javafx.geometry.HPos;
import javafx.geometry.Pos;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import jedzenie.app.App;

public class LogInScreen extends GridPane {

App main;

public LogInScreen(App main){
    this.main = main;

    setAlignment(Pos.CENTER);
    //setGridLinesVisible(true);

    setVgap(15);
    setHgap(10);

    Label welc = new Label("Welcome to FoodCalc. Please log in or register.");
    add(welc, 0, 0, 2, 1);

    Label lbUser = new Label("Username: ");
    add(lbUser, 0, 1);
    TextField tfUser = new TextField();
    add(tfUser, 1, 1);

    Label lbPass = new Label("Password: ");
    add(lbPass, 0, 2);
    PasswordField pfPass = new PasswordField();
    add(pfPass, 1, 2);

    Button logIn = new Button("Log in");
    add(logIn, 1, 3);
    setHalignment(logIn, HPos.RIGHT);
    logIn.setOnAction((ActionEvent e) -> {
        main.logIn();
    });

    Button register = new Button("Register");
    add(register, 1, 4);
    setHalignment(register, HPos.CENTER);
    register.setOnAction((ActionEvent e) -> {
        main.moveToRegisterScreen();
    });


}



}

和 RegisterScreen class:

import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import jedzenie.app.App;

public class RegisterScreen extends BorderPane {

    App main;
    Button register;
    ComboBox age;
    PasswordField pfPass, pfConfPass;

    public RegisterScreen(App main){
        this.main = main;
        setCenter(gridPane());
        setBottom(hbox());
        setPadding(new Insets(25,25,25,25));
    }

    GridPane gridPane() {
        GridPane gp = new GridPane();

        gp.setGridLinesVisible(true);
        gp.setVgap(15);
        gp.setHgap(10);
        gp.setAlignment(Pos.CENTER);

        Label lbUser = new Label("Username: ");
        gp.add(lbUser, 0, 1);
        TextField tfUser = new TextField();
        gp.add(tfUser, 1, 1);

        Label lbPass = new Label("Password: ");
        gp.add(lbPass, 0, 2);
        pfPass = new PasswordField();
        gp.add(pfPass, 1, 2);

        Label lbConfPass = new Label("Confirm Password: ");
        gp.add(lbConfPass, 0, 3);
        pfConfPass = new PasswordField();
        gp.add(pfConfPass, 1, 3);

        Label lbEmail = new Label("Email: ");
        gp.add(lbEmail, 0, 4);
        TextField tfEmail = new TextField();
        gp.add(tfEmail, 1, 4);

        Label lbSex = new Label("Sex: ");
        gp.add(lbSex, 2, 1);
        ComboBox cbSex = new ComboBox();
        gp.add(cbSex, 3, 1);

        Label lbAge = new Label("Age: ");
        gp.add(lbAge, 2, 2);
        ComboBox cbAge = new ComboBox();
        gp.add(cbAge, 3, 2);

        Label lbWeight = new Label("Weight: ");
        gp.add(lbWeight, 2, 3);
        TextField tfWeight = new TextField();
        gp.add(tfWeight, 3, 3);

        return gp;
    }

    HBox hbox(){
        HBox hbox = new HBox(10);


        Button back = new Button("Back");
        hbox.getChildren().add(back);
        back.setOnAction((ActionEvent e) ->{
            main.logOut();
        });

        Button register = new Button("Register");
        hbox.getChildren().add(register);


        return hbox;
    }


}

我也一直在尝试寻找有效方法和无效方法及其实现之间的区别。还是找不到原因。

编辑：抱歉，我没有注意到我没有放置 ProfileInfoScreen class。这是：

import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import jedzenie.app.App;

public class ProfileInfoScreen extends BorderPane {

    App main;
    Insets ins = new Insets(10,10,10,10);

    public ProfileInfoScreen(App main){
        this.main = main;
        setPadding(ins);
        setTop(lbWelcome);
        setLeft(vbox());

    }

    Label lbWelcome = new Label("Welcome, " + "XXXXXXXXXXX");

    VBox vbox(){

    VBox vbox = new VBox();
    vbox.setSpacing(10);
    vbox.setPadding(ins);

    Button btWeight = new Button("Change weight");
    vbox.getChildren().add(btWeight);
    btWeight.setOnAction((ActionEvent e) -> {
        //XXXXXXXXXX

    });

    return vbox;

    }
}

Answer 1

正如 James_D 评论的那样，我尝试了您的代码，它运行良好。当我点击注册按钮时，它确实显示了 table，其中包含用户名、密码、性别、年龄、电子邮件字段。我做了一个空白的 profileScreen，所以点击登录显示空白 window。我看不出有什么问题。请确保您所有的导入都来自 javafx 包。只是为了测试，尝试不同的 IDE（我在 Intellij 上试过）。

因为我没有足够的声誉无法发表评论，所以我在这里写了。

Answer 2

我知道这个问题已经得到解答，但是在你的 stage.setScene 行之后你的代码中没有 stage.show 可能会遇到一些问题。

JavaFX 改变场景不工作

JavaFX changing scene not working

java

javafx

scene