Java Swing JMenuItem即使输入JTextField组件也会拦截其加速键

Question

Example code:

public class FrameMenuTextFieldTest {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                final JFrame frame = new JFrame();
                frame.getContentPane().add(new JTextField());
                JMenuBar menubar = new JMenuBar();
                JMenu menu = new JMenu("Menu");
                JMenuItem item = new JMenuItem("Item1");
                item.addActionListener(new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        JOptionPane.showMessageDialog(frame, "Menu Item clicked");
                    }
                });
                item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_5, 0));
                menu.add(item);
                menubar.add(menu);
                frame.setJMenuBar(menubar);
                frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }

}

The problem here is if I type 5 into the textfield, not only the textfield gets this event, but the menu item as well, and its action is performed; message shown.

What is the simplest way to disable the key event propagation to the menu bar?

I my real application, I have a lot of menu items to disable for a few textfields.

Answer 1

Bind the JMenuItem with some modifiers such as Ctrl, Alt, Shift etc. if possible as mentioned here KeyStroke#getKeyStroke() .

Try something like as shown below to bind it with Ctrl+5 .

item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_5, InputEvent.CTRL_DOWN_MASK));

---

EDIT

It might help you if you don't want to use any modifier.

If the current focusable component is not JTextField then perform action on JMenuItem .

Sample code:

JMenuItem item = new JMenuItem("Item1");
item.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        Component component = frame.getFocusOwner();
        if (!(component instanceof JTextField)) {
            JOptionPane.showMessageDialog(frame, "Menu Item clicked");
        }
    }
});

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