如何将JMenuBar移动到Mac OS X上的屏幕菜单栏？

问题描述

当我将 JMenuBar 移动到Mac OS X上的屏幕菜单栏时，它会留下一些空白区域，菜单会出现在我的窗口中;我需要删除那个空间。我正在使用

When I move my JMenuBar to the screen menu bar on Mac OS X, it leaves some blank space where the menu would be in my window; I need to remove that space. I am using

System.setProperty("apple.laf.useScreenMenuBar", "true")

将我的 JMenuBar 移动到屏幕菜单栏。我的朋友使用Mac报告，如果我没有设置该属性，这将留下一些丑陋的垂直空间，菜单将驻留在该空间中。解决此问题的最佳方法是什么？

to move my JMenuBar to the screen menu bar. My friend who uses a Mac reports that this leaves some ugly vertical space where the menu would reside if I did not set that property. What is the best way to resolve this issue?

编辑：以下是我的来源示例：

Here is an example from my source:

public static void main(String[] args) {
    System.setProperty("apple.laf.useScreenMenuBar", "true");
    System.setProperty("com.apple.mrj.application.apple.menu.about.name", "Name");

    JFrame frame = new JFrame("Gabby");
    final DesktopMain dm = new DesktopMain();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(dm);
    frame.setSize(160, 144);
    frame.setLocationRelativeTo(null);
    frame.setIgnoreRepaint(true);

    JMenuBar menuBar = new JMenuBar();
    JMenu fileMenu = new JMenu("File");
    menuBar.add(fileMenu);

    // Populating the menu bar code goes here

    frame.setJMenuBar(menuBar);
    frame.setVisible(true);
}

推荐答案

取决于何时完成，在程序启动后设置属性可能为时已晚，无法生效。而是在发布时添加设置。

Depending on when it's done, setting the property after your program launches may be too late to be effective. Instead, add the setting at launch time.

java -Dapple.laf.useScreenMenuBar=true -jar MyApplication.jar

或者，在应用程序包的 Info.plist中设置属性，如，，和。

Alternatively, set the property in your application bundle's Info.plist, as discussed in Java Deployment Options for Mac OS X, Java Dictionary Info.plist Keys, About Info.plist Keys and Java Runtime System Properties.

<key>Properties</key>
<dict>
    <key>apple.laf.useScreenMenuBar</key>
    <string>true</string>
    ...
</dict>

附录：如下所示，使用该方法出现 not 的问题由@Urs Reupke或我自己提出。您的（缺少的） DesktopMain 可能有问题。

Addendum: As shown below, the problem does not appear using the approach suggested by @Urs Reupke or myself. Your (missing) DesktopMain may be at fault.

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;

/** @see http://stackoverflow.com/questions/8955638 */
public class NewMain {

    public static void main(String[] args) {
        System.setProperty("apple.laf.useScreenMenuBar", "true");
        System.setProperty(
            "com.apple.mrj.application.apple.menu.about.name", "Name");
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {

                JFrame frame = new JFrame("Gabby");
                final JPanel dm = new JPanel() {

                    @Override
                    public Dimension getPreferredSize() {
                        return new Dimension(320, 240);
                    }
                };
                dm.setBorder(BorderFactory.createLineBorder(Color.blue, 10));

                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(dm);
                frame.pack();
                frame.setLocationByPlatform(true);

                JMenuBar menuBar = new JMenuBar();
                JMenu fileMenu = new JMenu("File");
                menuBar.add(fileMenu);
                frame.setJMenuBar(menuBar);
                frame.setVisible(true);
            }
        });
    }
}

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