当 AcionListener 启动时 keyListener 停止工作

Question

我试图在按下 VK_ESCAPE 时调出密码对话框，并且它首先可以工作。但是，只要按下任何 JButton，焦点就会忽略 keyListenrs，这是我的代码，是否有任何快速修复。

package AVAG;

/**
 *
 * @author allan walls
 */
import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import static org.omg.CORBA.ORB.init;

public class avagui extends JFrame implements ActionListener, KeyListener {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    JComboBox comboBox;
    JButton app1, app2, app3, app4;
    //ImageIcon test1 =new ImageIcon(getClass().getResource("/images/Volunteering.jpg"));
    //websitelink link = new websitelink();
    GridLayout grid = new GridLayout(2, 2, -700, 0);

    Web1 web1 = new Web1();
    Web2 web2 = new Web2();
    Web3 web3 = new Web3();
    Web4 web4 = new Web4();
    JTextArea area = new JTextArea(6, 32);
       // keyboardgui kg = new keyboardgui();

    public avagui() {

        init();
        //setUndecorated(true);
    }

    private void init() {

        Container pane = this.getContentPane();
        this.requestFocusInWindow();
        pane.addKeyListener(this);
        pane.setFocusable(true);
        pane.setLayout(new GridLayout(2, 2, 4, 4));
        pane.setBackground(Color.black);
        ((JComponent) pane).setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));

        ImageIcon test1 = new ImageIcon(getClass().getResource("/images/Volunteering.jpg"));
        Image image = test1.getImage();

    // reduce by 50%
        image = image.getScaledInstance((int) (image.getWidth(null) / 1.18), (int) (image.getHeight(null) / 1.56), Image.SCALE_SMOOTH);

        test1.setImage(image);

   // JButton button = new JButton(test1);
        //pane.setBounds(0, 0, 200, 300);
        app1 = new JButton(test1);
        app1.setBackground(Color.BLACK);

        pane.add(app1);
        app1.addActionListener(this);
        ImageIcon test2 = new ImageIcon(getClass().getResource("/images/Aliss.jpg"));
        Image image2 = test2.getImage();
        image2 = image2.getScaledInstance((int) (image2.getWidth(null) / 1.18), (int) (image2.getHeight(null) / 1.56), Image.SCALE_SMOOTH);

        test2.setImage(image2);

        app2 = new JButton(test2);
        // 
        app2.setBackground(Color.BLACK);
        app2.addActionListener(this);
        pane.add(app2);

        ImageIcon test3 = new ImageIcon(getClass().getResource("/images/jobsearch.jpg"));
        Image image3 = test3.getImage();
        image3 = image3.getScaledInstance((int) (image3.getWidth(null) / 1.18), (int) (image3.getHeight(null) / 1.56), Image.SCALE_SMOOTH);

        test3.setImage(image3);
        app3 = new JButton(test3);
        app3.setBackground(Color.BLACK);
        app3.addActionListener(this);
        pane.add(app3);

        ImageIcon test4 = new ImageIcon(getClass().getResource("/images/Connect3.jpg"));
        Image image4 = test4.getImage();
        image4 = image4.getScaledInstance((int) (image4.getWidth(null) / 1.18), (int) (image4.getHeight(null) / 1.56), Image.SCALE_SMOOTH);

        test4.setImage(image4);
        app4 = new JButton(test4);
        app4.setBackground(Color.BLACK);
        app4.addActionListener(this);
        pane.add(app4);

    }

    public void shutdown() {
        System.exit(EXIT_ON_CLOSE);
    }

    @Override
    public void keyReleased(KeyEvent e) {
    }

    @Override
    public void keyTyped(KeyEvent e) {
    }

    /**
     *
     * @param e
     * @param k
     */
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub

        if (e.getSource() == app1) {
            System.out.println("test1");
            web1.run();
        }

        if (e.getSource() == app2) {
            System.out.println("test2");
            web2.run();
        }
        if (e.getSource() == app3) {
            System.out.println("test3");
            web3.run();
        }
        if (e.getSource() == app4) {
            System.out.println("test4");
            web4.run();
        }

    }

    @Override
    public void keyPressed(KeyEvent e) {

        PasswordDialog pass = new PasswordDialog();
        System.out.println("works");
        if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {

            pass.run();

        }
    }

}

Answer 1

我试图在按下 VK_ESCAPE 时调出密码对话框，它一开始就可以工作。但是只要按下任何 JButtons，焦点就会忽略 keyListenrs

没错，因为 KeyEvents 只会分派给有焦点的组件。因此，除非您想将转义逻辑添加到所有组件中，否则您不应该使用 KeyListener。相反，您应该使用键绑定。

查看Escape Key and Dialog 的示例，该示例显示了如何通过向对话框的根窗格添加绑定来在按下转义键时关闭对话框。

显然你的代码会有所不同，因为你想显示一个对话框，但是键绑定的概念是一样的，你只需要创建自定义动作。

注意：顺便说一下，我不确定您是否使用转义键来显示对话框是最好的击键方式。通常，转义键用于关闭事物，例如对话框或打开组合框或弹出菜单。