如何防止在单击CheckMenuItem（JavaFX）时关闭菜单按钮

我是Java新手，我想知道当我点击项目时如何防止菜单按钮弹出窗口关闭，我尝试了下面的功能，我在这个网站上找到了这个功能，但似乎没有做任何事情。我需要它来克隆我的C应用程序，目的是学习Java

@FXML
private MenuButton menuButton;

@FXML
    void initialize() {
        CheckMenuItem menuButtonItem1 = new CheckMenuItem("Item 1");
        CheckMenuItem menuButtonItem2 = new CheckMenuItem("Item 2");
        CheckMenuItem menuButtonItem3 = new CheckMenuItem("Item 3");
        menuButtonItem1.setOnAction(new EventHandler<ActionEvent>() {
        public void handle(ActionEvent e) {
           e.consume();
    }
});
        menuButtonItem2.setOnAction(new EventHandler<ActionEvent>() {
        public void handle(ActionEvent e) {
           e.consume();
    }
});
        menuButtonItem3.setOnAction(new EventHandler<ActionEvent>() {
        public void handle(ActionEvent e) {
           e.consume();
    }
});
}

CustomMenuItem类提供了一个setHideOnClick方法来处理这个问题。为了使用它，您将在此CustomMenuItem中包装一个标准节点：

下面是供您尝试的完整示例：

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.control.CustomMenuItem;
import javafx.scene.control.MenuButton;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class CheckMenuKeepOpen extends Application {

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

    @Override
    public void start(Stage primaryStage) {

        // Simple Interface
        VBox root = new VBox(10);
        root.setAlignment(Pos.CENTER);
        root.setPadding(new Insets(10));

        // Create the MenuButton
        MenuButton menuButton = new MenuButton("Click Me");

        for (int i = 0; i < 5; i++) {

            // In order to keep the menu open when selecting a CheckBox, we need to wrap it in a CustomMenuItem
            CustomMenuItem menuItem = new CustomMenuItem(new CheckBox("Item #" + i));

            // This method is pretty obvious; it keeps the menu open when selecting this item.
            menuItem.setHideOnClick(false);
            menuButton.getItems().add(menuItem);
        }

        root.getChildren().add(menuButton);

        // Show the stage
        primaryStage.setScene(new Scene(root));
        primaryStage.setTitle("Sample");
        primaryStage.show();
    }
}

---

我要感谢你的快速帮助。也祝你一天愉快。

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.control.CustomMenuItem;
import javafx.scene.control.MenuButton;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class CheckMenuKeepOpen extends Application {

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

    @Override
    public void start(Stage primaryStage) {

        // Simple Interface
        VBox root = new VBox(10);
        root.setAlignment(Pos.CENTER);
        root.setPadding(new Insets(10));

        // Create the MenuButton
        MenuButton menuButton = new MenuButton("Click Me");

        for (int i = 0; i < 5; i++) {

            // In order to keep the menu open when selecting a CheckBox, we need to wrap it in a CustomMenuItem
            CustomMenuItem menuItem = new CustomMenuItem(new CheckBox("Item #" + i));

            // This method is pretty obvious; it keeps the menu open when selecting this item.
            menuItem.setHideOnClick(false);
            menuButton.getItems().add(menuItem);
        }

        root.getChildren().add(menuButton);

        // Show the stage
        primaryStage.setScene(new Scene(root));
        primaryStage.setTitle("Sample");
        primaryStage.show();
    }
}