Java Swing Key事件库

Question

在我的一个菜单中,一个menuItem的快捷键是

Ctrl+Greater

代码是KeyEvent.VK_GREATER,Event.CTRL_MASK

但是,当我按Ctrl+ Greater它不工作....任何人都可以建议吗？

Answer 1

查看我的代码。这里一切都很好。

这个例子并不适合这个问题，但我首先给出了它并且（为此而烦恼）因此它留在这里供参考。对于适当的一个，即在菜单项上设置加速器，请参阅下面的 EDIT1。

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class CtrlGreaterTestInaccurateAnswer extends JFrame
{
    private static final long serialVersionUID = 1L;
    private KeyListener kL = new KeyAdapter()
    {
        @Override
        public void keyReleased(KeyEvent e)
        {
            super.keyReleased(e);
        System.out.println("keyReleased KeyEvent.VK_GREATER=" + KeyEvent.VK_GREATER
                + "; e.getKeyCode()=" + e.getKeyCode()
                + "; e.getKeyChar()=" + e.getKeyChar()
                + "; e.isControlDown()=" + e.isControlDown()
                + "; e.isShiftDown()=" + e.isShiftDown() 
                + "; (int)'.'="+(int)'.' +"; (int)'>'="+(int)'>');
        if(e.isControlDown()    && e.getKeyChar() == '>')
            System.out.println("keyReleased ctrl + greater");
        }
    };

    public CtrlGreaterTestInaccurateAnswer()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        addKeyListener(kL);
    }

    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                CtrlGreaterTestInaccurateAnswer f = new CtrlGreaterTestInaccurateAnswer();
                f.setSize(400, 400);
                f.setVisible(true);
            }
        });
    }
}

据我观察，KeyEvent.VK_GREATER 返回160，按“>”时返回的代码是46，即与按“.”相同。因此，如果您使用 getKeyCode 方法进行检测，则会出现问题。

EDIT1（适当的示例）： 设置 CTRL + > 的加速器。请注意，加速器仍然会显示 Ctrl+Shift-PERIOD (Ctrl+Shift+。)

import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;

public class CtrlGreaterTest extends JFrame
{
    private static final long serialVersionUID = 1L;

    public CtrlGreaterTest()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JMenuBar menuBar = new JMenuBar();
        JMenu menu1 = new JMenu("Menu1");
        JMenuItem menuItem1 = new JMenuItem();
        menuItem1.setAction(onCtrlGreaterAction);
        menuItem1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_PERIOD, 
                KeyEvent.CTRL_MASK | KeyEvent.SHIFT_MASK));         
        //or use this
        //menuItem1.setAccelerator(KeyStroke.getKeyStroke("ctrl shift PERIOD"));
        menu1.add(menuItem1);

        JMenuItem menuItem2 = new JMenuItem();
        menuItem2.setAction(onCtrlAAction);
        menuItem2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, 
                KeyEvent.CTRL_MASK)); 

        System.out.println("KeyEvent.VK_PERIOD| KeyEvent.SHIFT_MASK="
                +(KeyEvent.VK_PERIOD| KeyEvent.SHIFT_MASK)
                + "; KeyEvent.VK_GREATER="+(KeyEvent.VK_GREATER) 
                + "; (int)'>'="+(int)'>');
        menu1.add(menuItem2);       
        menuBar.add(menu1);
        setJMenuBar(menuBar);
    }
    private AbstractAction onCtrlGreaterAction = new AbstractAction("CTRL + > Action")
    {
        private static final long serialVersionUID = 1L;

        @Override
        public void actionPerformed(ActionEvent e)
        {
            System.out.println("onCtrlGreaterAction actionPerformed OI");
        }
    };

    private AbstractAction onCtrlAAction = new AbstractAction("CTRL + a Action")
    {
        private static final long serialVersionUID = 1L;

        @Override
        public void actionPerformed(ActionEvent e)
        {
            System.out.println("onCtrlAAction actionPerformed AI");
        }
    };

    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                CtrlGreaterTest f = new CtrlGreaterTest();
                f.setSize(400, 400);
                f.setVisible(true);
            }
        });
    }
}

希望就是这样:)