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JavaFX：在第二阶段按ESC键不创建新的警报对话框

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UPDATE #2

嗨伙计们，lemme打破了我的想法 .

当前设置：

  • 带有按钮（名为 rootButton ）的primaryStage打开secondaryStage .

  • 带有按钮（名为 closeButton ）的secondaryStage关闭此secondaryStage .

  • closeButton.setCancelButton(true); 使ESC键在secondaryStage上按下 closeButton .

所需功能：

  • 在secondaryStage上按ESC键应弹出一个Alert对话框，询问我是否真的要关闭secondaryStage . <<< How to implement?

运行当前代码的结果：

  • 当我按下secondaryStage上的ESC键时，警告对话框 doesn't show

  • 命令行显示： "Cancel was pressed" .

因此，closeButton以某种方式跳过Alert对话框弹出窗口，而不是直接导致

if (result.get() == ButtonType.CANCEL) {
    System.out.println("Cancel was pressed.");
}

那么ESC键事件是否可能从secondaryStage传递到Alert对话框？如果是这种情况， how 和 where 我是否在“警报”对话框中正确使用了此键事件？

当前代码（在GoXr3Plus的帮助下格式化）：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonType;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Closing extends Application {

  // handle primaryStage
  @Override
  public void start(Stage primaryStage) {
     Button rootButton = new Button("show dialog");

     // rootButton
     rootButton.setOnAction(ac -> {

        // CloseButton
        Button closeButton = new Button("Close");
        closeButton.setCancelButton(true); // make this cancel button
        closeButton.setOnAction(a -> {

            // Initialize the alert
            Alert alert = new Alert(AlertType.CONFIRMATION, "You really want to quit?");
            // Show the alert
            alert.showAndWait().ifPresent(result -> {
                if (result == ButtonType.OK)
                    System.out.println("OK was pressed.");
                else if (result == ButtonType.CANCEL)
                    System.out.println("Cancel was pressed.");
            });

            closeButton.getScene().getWindow().hide();
        });

        StackPane dialogPane = new StackPane(closeButton);

        Stage secondaryStage = new Stage();
        secondaryStage.setScene(new Scene(dialogPane, 200, 200));
        secondaryStage.showAndWait();
    });

    StackPane rootPane = new StackPane(rootButton);

    Scene scene = new Scene(rootPane, 300, 250);

    primaryStage.setTitle("Hello World!");
    primaryStage.setScene(scene);
    primaryStage.show();
}

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

}
java javafx dialog

3 回答

  • 0

    已解决：

    正如Ron指出这段代码运行正常 . 我更新到当前版本的Java JDK 1.8.0_91 ，现在所需的ESC键按下确实打开了一个新对话框！谢谢各位的意见！

    回复于
  • 0

    您可能必须发布所有代码或发布mvce，因为您已经发布的代码完全适合我 . 几乎看起来好像你在某种程度上连续两次紧急逃生 .

    尝试将 setOnAction 方法更改为以下内容，并检查输出的标准输出 .

    btnCancel.setOnAction((ActionEvent event) -> {
    Alert alert = new Alert(AlertType.CONFIRMATION);
    alert.setContentText("You really want to quit?");
    Optional<ButtonType> result = alert.showAndWait();
    if (result.isPresent()) {
        if (result.get() == ButtonType.OK) {
            System.out.println("OK was pressed.");
        }
        if (result.get() == ButtonType.CANCEL) {
            System.out.println("Cancel was pressed.");
        }
    }
    primaryStage.close();
});
    回复于
  • 0

    你的代码没有编译，所以我修改它看起来更好，并添加了一些评论 . 让我知道它是否做你想要的：

    import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonType;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Closing extends Application {

  // handle primaryStage
  @Override
  public void start(Stage primaryStage) {
     Button rootButton = new Button("show dialog");

     // rootButton
     rootButton.setOnAction(ac -> {

        // CloseButton
        Button closeButton = new Button("Close");
        closeButton.setCancelButton(true); // make this cancel button
        closeButton.setOnAction(a -> {

            // Initialize the alert
            Alert alert = new Alert(AlertType.CONFIRMATION, "You really want to quit?");
            // Show the alert
            alert.showAndWait().ifPresent(result -> {
                if (result == ButtonType.OK)
                    System.out.println("OK was pressed.");
                else if (result == ButtonType.CANCEL)
                    System.out.println("Cancel was pressed.");
            });

            closeButton.getScene().getWindow().hide();
        });

        StackPane dialogPane = new StackPane(closeButton);

        Stage secondaryStage = new Stage();
        secondaryStage.setScene(new Scene(dialogPane, 200, 200));
        secondaryStage.showAndWait();
    });

    StackPane rootPane = new StackPane(rootButton);

    Scene scene = new Scene(rootPane, 300, 250);

    primaryStage.setTitle("Hello World!");
    primaryStage.setScene(scene);
    primaryStage.show();
}

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

}
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