如何在控制器类的javafx应用程序中交换屏幕？ [英] How to swap screens in a javafx-application in the controller-class?

问题描述

嘿我在网上搜索了很长一段时间，但我找不到解决以下问题的方法：

Hey I searched the net for quite a while but I couldn't find a solution to the following problem:

在javafx中你有3个基本文件; controller-class，fxml文件和应用程序类。现在我想在控制器中做出反应点击按钮（效果非常好）并更改该点击的屏幕（你通常使用stage.setScreen（）），但我没有参考舞台（你可以在应用程序类中找到。）

In javafx you got 3 basic files; the controller-class, the fxml file and the application class. Now I want to react in the controller to a button-click (which works perfectly fine) and change the screen on that click (which you normally do with stage.setScreen() ), but I have no reference to the stage (which you can find in the application class).

应用程序 - 样本：

public class JavaFXApplication4 extends Application {

@Override
public void start(Stage stage) throws Exception {
    Parent root = FXMLLoader.load(getClass().getResource("Sample.fxml"));

    Scene scene = new Scene(root);

    stage.setScene(scene);
    stage.show();
}

/**
 * The main() method is ignored in correctly deployed JavaFX application.
 * main() serves only as fallback in case the application can not be
 * launched through deployment artifacts, e.g., in IDEs with limited FX
 * support. NetBeans ignores main().
 *
 * @param args the command line arguments
 */
public static void main(String[] args) {
    launch(args);
}
}

FXML-样本：

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="200.0" prefWidth="320.0"  xmlns:fx="http://javafx.com/fxml" fx:controller="javafxapplication4.SampleController">
  <children>
  <Button id="button" fx:id="nextScreen" layoutX="126.0" layoutY="90.0" onAction="#handleButtonAction" text="Next Screen" />
  <Label fx:id="label" layoutX="126.0" layoutY="120.0" minHeight="16.0" minWidth="69.0" />
  </children>
</AnchorPane>

控制器 - 样本：

public class SampleController implements Initializable {

@FXML
private Label label;

@FXML
private void handleButtonAction(ActionEvent event) {
    System.out.println("You clicked me!");
    label.setText("Hello World!");
    //Here I want to swap the screen!
}

@Override
public void initialize(URL url, ResourceBundle rb) {
    // TODO
}    
}

我会感谢任何帮助。

推荐答案

@FXML
private void handleButtonAction(ActionEvent event) {
    System.out.println("You clicked me!");
    label.setText("Hello World!");
    //Here I want to swap the screen!

    Stage stageTheEventSourceNodeBelongs = (Stage) ((Node)event.getSource()).getScene().getWindow();
    // OR
    Stage stageTheLabelBelongs = (Stage) label.getScene().getWindow();
    // these two of them return the same stage
    // Swap screen
    stage.setScene(new Scene(new Pane()));
}

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