用户尝试在JavaFx中使用setOnCloseRequest关闭应用程序时的警报框 [英] Alert Box For When User Attempts to close application using setOnCloseRequest in JavaFx

问题描述

我试图提示用户确认他们想在退出前关闭程序。如果任务仍在执行，我想确认仍然希望退出或让他们有机会在退出之前完成任务。我使用了setOnCloseRequest，但它没有用。我使用了event.consume，似乎只是禁用了[x]按钮。任何建议表示赞赏。我发现这里有一个类似的问题对我不起作用 - >

  import javafx.application.Application; 
 import javafx.event.EventHandler; 
 import javafx.geometry.Insets; 
 import javafx.scene.Scene; 
 import javafx.scene.control。*; 
 import javafx.scene.layout.StackPane; 
 import javafx.stage。*; 
 import javafx.stage.WindowEvent; 
 
 import java.util.Optional; 
 
公共类CloseConfirm扩展Application {
 
 private Stage mainStage; 
 
 @Override 
 public void start（阶段阶段）抛出异常{
 this.mainStage = stage; 
 stage.setOnCloseRequest（confirmCloseEventHandler）; 
 
按钮closeButton = new按钮（关闭应用程序）; 
 closeButton.setOnAction（event  - > 
 stage.fireEvent（
 new WindowEvent（
 stage，
 WindowEvent.WINDOW_CLOSE_REQUEST 
）
） 
）; 
 
 StackPane layout = new StackPane（closeButton）; 
 layout.setPadding（new Insets（10））; 
 
 stage.setScene（新场景（布局））; 
 stage.show（）; 
} 
 
 private EventHandler< WindowEvent> confirmCloseEventHandler = event  - > {
警报closeConfirmation =新警报（
 Alert.AlertType.CONFIRMATION，
你确定要退出吗？
）; 
 Button exitButton =（Button）closeConfirmation.getDialogPane（）。lookupButton（
 ButtonType.OK 
）; 
 exitButton.setText（退出）; 
 closeConfirmation.setHeaderText（确认退出）; 
 closeConfirmation.initModality（Modality.APPLICATION_MODAL）; 
 closeConfirmation.initOwner（mainStage）; 
 
 //通常情况下，您只需使用默认的警报定位，
 //但是对于这个简单的示例，主阶段很小，
 //所以明确定位警报所以主窗口仍然可以看到。 
 closeConfirmation.setX（mainStage.getX（））; 
 closeConfirmation.setY（mainStage.getY（）+ mainStage.getHeight（））; 
 
可选< ButtonType> closeResponse = closeConfirmation.showAndWait（）; 
 if（！ButtonType.OK.equals（closeResponse.get（）））{
 event.consume（）; 
} 
}; 
 
 public static void main（String [] args）{
 launch（args）; 
} 
 
} 
  

答案确实使用 event.consume（），你说你试过并且没有为你工作（虽然我不知道为什么不能，因为这对我来说这个示例代码很合适）。

I am trying to prompt the user to confirm they want to close a program before exiting. In the event a task is still being executed, I wanted to confirm that the still wish to exit or give them a chance to allow the task to finish before exiting. I used setOnCloseRequest, but it did not work. Ive used event.consume which just seemed to disable the [x] button. Any suggestions are appreciated. I found a similar question here that did not work for me -> JavaFX stage.setOnCloseRequest without function?

Public class Sample extends Application {
      @Override
    public void start(Stage stage) throws Exception {

    stage.setOnCloseRequest(event -> {
        NewScanView checkScan = new NewScanView();
        boolean isScanning = checkScan.isScanning();

            Alert alert = new Alert(AlertType.CONFIRMATION);
            alert.setTitle("Close Confirmation");
            alert.setHeaderText("Cancel Creation");
            alert.setContentText("Are you sure you want to cancel creation?");
        if (isWorking == true){

            Optional<ButtonType> result = alert.showAndWait();
            if (result.get() == ButtonType.OK){
                stage.close();
            }

            if(result.get()==ButtonType.CANCEL){
                alert.close();
            }

        }


    });
    stage.setHeight(600);
    stage.setWidth(800);
    stage.setTitle("Title");
    stage.show();

}

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

}

解决方案

This answer is based on the answer to Javafx internal close request. That question is different from this question, but the answer is very similar.

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.StackPane;
import javafx.stage.*;
import javafx.stage.WindowEvent;

import java.util.Optional;

public class CloseConfirm extends Application {

    private Stage mainStage;

    @Override
    public void start(Stage stage) throws Exception {
        this.mainStage = stage;
        stage.setOnCloseRequest(confirmCloseEventHandler);

        Button closeButton = new Button("Close Application");
        closeButton.setOnAction(event ->
                stage.fireEvent(
                        new WindowEvent(
                                stage,
                                WindowEvent.WINDOW_CLOSE_REQUEST
                        )
                )
        );

        StackPane layout = new StackPane(closeButton);
        layout.setPadding(new Insets(10));

        stage.setScene(new Scene(layout));
        stage.show();
    }

    private EventHandler<WindowEvent> confirmCloseEventHandler = event -> {
        Alert closeConfirmation = new Alert(
                Alert.AlertType.CONFIRMATION,
                "Are you sure you want to exit?"
        );
        Button exitButton = (Button) closeConfirmation.getDialogPane().lookupButton(
                ButtonType.OK
        );
        exitButton.setText("Exit");
        closeConfirmation.setHeaderText("Confirm Exit");
        closeConfirmation.initModality(Modality.APPLICATION_MODAL);
        closeConfirmation.initOwner(mainStage);

        // normally, you would just use the default alert positioning,
        // but for this simple sample the main stage is small,
        // so explicitly position the alert so that the main window can still be seen.
        closeConfirmation.setX(mainStage.getX());
        closeConfirmation.setY(mainStage.getY() + mainStage.getHeight());

        Optional<ButtonType> closeResponse = closeConfirmation.showAndWait();
        if (!ButtonType.OK.equals(closeResponse.get())) {
            event.consume();
        }
    };

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

}

The answer does use event.consume(), which you said you tried and did not work for you (though I'm not sure why not as it works fine for me with this sample code).

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