javafx如何在辅助窗口关闭时保留数据

Question

问题很简单，我创建了一个小程序，有两个阶段，主窗口和辅助阶段，主窗口有一个按钮来启动第二阶段，当我在窗口中输入文本时，第二阶段有文本字段、按钮和标签文本字段并按下按钮，文本将显示在标签中，我想要做的是，当我关闭辅助阶段并且程序仍在运行时，我希望数据相同，因此当按下按钮并再次启动辅助阶段时我将看到最后的结果，就好像我从未关闭第二阶段一样

这是主类

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Modality;
import javafx.stage.Stage;

import java.io.IOException;

public class Main extends Application {
private Stage primaryStage;
    @Override
    public void start(Stage primaryStage) throws Exception{
        this.primaryStage=primaryStage;
        mainWindow();
    }

    void mainWindow() {
        try {
            FXMLLoader loader = new FXMLLoader(getClass().getResource("FirstWindow.fxml"));
            Parent root = loader.load();
            Controller controller = loader.getController();
            controller.setMain(this ,primaryStage);
            Scene scene = new Scene(root);

            primaryStage.setScene(scene);
            primaryStage.show();

        }catch (IOException e){
            e.printStackTrace();
        }

    }

    public void secondaryWindow() {
        try {
            FXMLLoader loader = new FXMLLoader(getClass().getResource("SecondWindow.fxml"));
            Parent root = loader.load();
            Scene scene = new Scene(root);

            Stage secondaryStage=new Stage();
            secondaryStage.initOwner(primaryStage);
            secondaryStage.initModality(Modality.WINDOW_MODAL);
            swController controller = loader.getController();
            controller.setMain(this,secondaryStage);

            secondaryStage.setScene(scene);
            secondaryStage.show();

        }catch (IOException e){
            e.printStackTrace();
        }

    }


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



}

以及第二阶段控制类

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.stage.Stage;

import java.net.URL;
import java.util.ResourceBundle;

/**
 * Created by ahmednageeb on 11/29/16.
 */
public class swController implements Initializable {
    private Main main;
    private Stage secondaryStage;

    public void setMain(Main main, Stage secondaryStage) {
        this.main = main;
        this.secondaryStage = secondaryStage;}
    @FXML
    private Label label;
    @FXML
    private TextField text;



    @FXML
    private void change(ActionEvent event) {
        String a=text.getText();
        label.setText(a);
        text.clear();

    }
    public void goBack() {
        secondaryStage.close();
    }
    @Override
    public void initialize(URL location, ResourceBundle resources) {

    }
}

最后是第一级 Controller

package sample;

import javafx.stage.Stage;

public class Controller {
    private Main main;
    private Stage primaryStage;


    public void setMain(Main main,Stage primaryStage){
        this.main=main;
        this.primaryStage =primaryStage;
    }

    public void close(){
        primaryStage.close();
    }



    public void changeWindow(){
        main.secondaryWindow();

    }
}

Answer 1

一种解决方案可能是在启动时加载辅助窗口但隐藏它。然后使用按钮来显示它。当您关闭它时，再次隐藏它。

看看这样的东西是否有效!

Main:

package hidepopup;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class HidePopup extends Application {

    @Override
    public void start(Stage stage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.setTitle("first stage");
        stage.show();
    }

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

First FXML:

<?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" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" fx:controller="hidepopup.FXMLDocumentController">
    <children>
        <Button layoutX="126" layoutY="90" text="Click Me!" onAction="#handleButtonAction" fx:id="button" />
        <Label layoutX="126" layoutY="120" minHeight="16" minWidth="69" fx:id="label" />
    </children>
</AnchorPane>

First Controller:

package hidepopup;

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.stage.Stage;

public class FXMLDocumentController implements Initializable {

    @FXML
    private Label label;

    FXMLLoader loader;
    Parent root2;
    Stage stage2;

    @FXML
    private void handleButtonAction(ActionEvent event) {
        try
        {
            Scene scene2 = new Scene(root2);            
            stage2.setScene(scene2); 
            stage2.setTitle("second stage");
            stage2.showAndWait();
        }
        catch(IllegalArgumentException ex)
        {
            stage2.show();
        }
    }

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        try 
        {
            loader = new FXMLLoader(getClass().getResource("FXMLPopup.fxml"));
            root2 = loader.load();
            FXMLPopupController dac = (FXMLPopupController) loader.getController();
            stage2 = new Stage();
        } 
        catch (IOException ex) 
        {
            Logger.getLogger(FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex);
        }
    } 
}

Second FXML:

<?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" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" fx:controller="hidepopup.FXMLPopupController">
    <children>
        <Button layoutX="126" layoutY="90" text="Click Me!" onAction="#handleButtonAction" fx:id="button" />
        <Label layoutX="126" layoutY="120" minHeight="16" minWidth="69" fx:id="label" />
    </children>
</AnchorPane>

Second Controller

package hidepopup;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;

public class FXMLPopupController implements Initializable {

    @FXML
    public Label label;

    @FXML
    private void handleButtonAction(ActionEvent event){        
        label.getScene().getWindow().hide();
    }

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

两个窗口的布局完全相同，因此按下按钮后，您可能希望将顶部布局滑过去。另外，我没有测试第二阶段是否保存其数据。在第二阶段添加一个文本框并进行测试。我希望这会有所帮助。