JavaFX+MVC。如何隐藏/显示多个窗口？

Question

当我点击“打开第二个窗口”时，如何隐藏主窗口。当我关闭第二个窗口时，会显示主窗口吗？我读了这个post ，但我不知道如何为我的任务实现它。谢谢!

我有下一个代码:
主.java

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("First Stage");
        try {
            primaryStage.setResizable(false);

            Parent root = FXMLLoader.load(getClass().getResource("MainView.fxml"));
            Scene scene = new Scene(root);
            primaryStage.setScene(scene);
            primaryStage.show();

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

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

MainWiew.fxml

<?import javafx.geometry.*?>
<?import javafx.scene.text.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.BorderPane?>

<BorderPane id="rootMain" prefHeight="418.0" prefWidth="691.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.view.MainController">
   <top>

   </top>
   <center>
      <AnchorPane prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
         <children>
            <VBox fillWidth="false" prefHeight="400.0" prefWidth="394.0" spacing="8.0">
               <children>
                  <Button id="btnMainOne" fx:id="btnMainOne" mnemonicParsing="false" prefHeight="51.0" prefWidth="398.0" text="Open second window" textFill="#4460ff">
                     <font>
                        <Font name="Times New Roman Bold" size="20.0" />
                     </font>
                  </Button>

               </children>
               <padding>
                  <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
               </padding>
            </VBox>
         </children>
      </AnchorPane>
   </center>
</BorderPane>

主 Controller .java

import java.io.IOException;  
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.input.MouseEvent;
import javafx.stage.Modality;
import javafx.stage.Stage;

public class MainController {
    @FXML
    private Button btnMainOne;

    @FXML
    private void initialize() {
        btnMainOne.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent mouseEvent) {

                try {
                    Stage stage = new Stage();
                    stage.setTitle("Second stage");
                    stage.setScene(new Scene(root, 450, 450));
                    stage.show();

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


            }
        });

    }
}

Answer 1

您可以通过调用 getScene().getWindow() 获取主窗口。您可以在显示新舞台后对其调用 hide() 以将其隐藏，并且您可以在新舞台隐藏时向显示主窗口的新舞台注册事件监听器:

@FXML
private void initialize() {
    btnMainOne.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
        @Override
        public void handle(MouseEvent mouseEvent) {

            Stage primaryStage = (Stage)btnMainOne.getScene().getWindow();

            try {
                Stage stage = new Stage();
                stage.setTitle("Second stage");
                stage.setScene(new Scene(root, 450, 450));

                stage.setOnHidden(e -> primaryStage.show());

                stage.show();

                primaryStage.hide();

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


        }
    });

}