Java/Swing/Mac OSX : Converting JMenu to JPopupMenu using ScreenMenuBar

Question

我有一个应用程序，它有一个带菜单栏的主 GUI 和另一个全屏框架，这使得主 GUI 的某些部分以全屏独占模式显示。当我处于全屏模式时，我想将菜单栏中的下拉菜单绑定(bind)为 jpopupmenu。

Swing在JMenu中提供了函数getPopupMenu()。乍一看这个功能似乎运行良好。我可以将鼠标悬停在菜单项上并移动到子菜单并查看。将鼠标悬停在子菜单上确实会强调子菜单，将鼠标悬停在普通菜单项(或单选按钮菜单项或复选框菜单项)上不会强调该项目。但是，我实际上无法单击菜单项。不过，键盘快捷键实际上工作得很好。该问题本质上与此论坛上提出的问题相同(但问题尚未解决):

http://www.java-forums.org/new-java/16463-jmenu-jpopupmenu.html

如果我在菜单栏初始化并在主 GUI 中使用/显示后添加 JMenuItem(因此当切换到全屏框架时)，则菜单项实际上是可单击的。该菜单项也可以在主 GUI 的菜单栏中单击。初始化 jMenu 后直接执行 getPopupMenu() 不会改变任何内容。不使用全屏独占模式也不会改变问题。

编辑

我似乎遗漏了一些重要信息:我正在 Mac OSX 上测试该应用程序并使用:System.setProperty("apple.laf.useScreenMenuBar", "true");

要使菜单栏使用 native 菜单栏。如果我禁用此功能，弹出菜单将按预期工作。这看起来像是 mac java API 中的一个错误？他们有办法克服这个吗？

很抱歉忘记提及这一点，我不知道这会影响任何事情(尽管这似乎很明显)。

Answer 1

好吧，我可能遗漏了一些东西，但我很快就把它拼凑在一起了，没有任何问题

public class PopupFrame extends javax.swing.JFrame {

    /**
     * Creates new form PopupFrame
     */
    public PopupFrame() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jMenuBar1 = new javax.swing.JMenuBar();
        mnuFile = new javax.swing.JMenu();
        jMenuItem1 = new javax.swing.JMenuItem();
        jMenuItem2 = new javax.swing.JMenuItem();
        jMenuItem3 = new javax.swing.JMenuItem();
        jMenuItem4 = new javax.swing.JMenuItem();
        jMenuItem5 = new javax.swing.JMenuItem();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                doMouseClicked(evt);
            }
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                doMouseClicked(evt);
            }
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                doMouseClicked(evt);
            }
        });

        mnuFile.setText("File");

        jMenuItem1.setText("New");
        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                doActionPerformed(evt);
            }
        });
        mnuFile.add(jMenuItem1);

        jMenuItem2.setText("Open");
        jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                doActionPerformed(evt);
            }
        });
        mnuFile.add(jMenuItem2);

        jMenuItem3.setText("Save");
        jMenuItem3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                doActionPerformed(evt);
            }
        });
        mnuFile.add(jMenuItem3);

        jMenuItem4.setText("Close");
        jMenuItem4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                doActionPerformed(evt);
            }
        });
        mnuFile.add(jMenuItem4);

        jMenuItem5.setText("Exit");
        jMenuItem5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                doActionPerformed(evt);
            }
        });
        mnuFile.add(jMenuItem5);

        jMenuBar1.add(mnuFile);

        setJMenuBar(jMenuBar1);

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 278, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    private void doActionPerformed(java.awt.event.ActionEvent evt) {

        JMenuItem mi = (JMenuItem) evt.getSource();

        JOptionPane.showMessageDialog(this, "Clicked " + mi.getText());

    }

    private void doMouseClicked(java.awt.event.MouseEvent evt) {

        if (evt.isPopupTrigger()) {

            JPopupMenu popupMenu = mnuFile.getPopupMenu();
            popupMenu.show(this, evt.getX(), evt.getY());

        }

    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /*
         * Set the Nimbus look and feel
         */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(PopupFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(PopupFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(PopupFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(PopupFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /*
         * Create and display the form
         */
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new PopupFrame().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JMenuItem jMenuItem2;
    private javax.swing.JMenuItem jMenuItem3;
    private javax.swing.JMenuItem jMenuItem4;
    private javax.swing.JMenuItem jMenuItem5;
    private javax.swing.JMenu mnuFile;
    // End of variables declaration
}

抱歉，我必须在我 3 个月大的 child 小睡时把它放在一起，所以它又快又丑:P

更新

经过一番尝试后，似乎当我们自己调用弹出窗口时，我正在更改弹出窗口的父引用(invoker)，这意味着当 JMenu 尝试时要显示弹出窗口，上下文完全错误。

我更新了 doActionPerformed 方法，如下所示:

JOptionPane.showMessageDialog(this, "Clicked " + mi.getText());
JPopupMenu popupMenu = mnuFile.getPopupMenu();
popupMenu.setInvoker(mnuFile);

基本上，保留弹出窗口的客户端引用。