java - Action/Keylisteners 不能正常工作

Question

我有两个框架(一个主窗口和一个弹出窗口)。在主框架上添加了键和鼠标监听器。两者都工作得很好。在弹出窗口中有 50 个按钮。我为所有这些设置了一个 Action 监听器。它工作正常。我也有按键和鼠标监听器。鼠标工作。键是片状的。主框架中使用的相同 keyListener 类也被添加到弹出框架中。一旦弹出窗口显示，key listener 就会工作，一旦发生鼠标单击(Action listener 启动)keylistener 就会停止工作。请帮忙。附上的代码是简化版

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class key {
    private static  class toolsAction implements ActionListener {
        public void actionPerformed (ActionEvent ae) {
            log("Command " + Integer.parseInt(ae.getActionCommand()));
        }
    }
    private static void log(String s) { System.out.println(s); }
    private static class keyboardHandler implements KeyListener {
        public void keyPressed( KeyEvent e) { log("KB Press called ");   }
        public void keyReleased(KeyEvent e) { log("KB Release called "); }
        public void keyTyped   (KeyEvent e) { log("KB Typed called ");   }
    }
    public static void main(String [] args) {
        JFrame pFrame = new JFrame("Frame");
        pFrame.addKeyListener(new keyboardHandler());
        Container pane = pFrame.getContentPane();
        pane.setLayout(null);
        pane.setVisible(true);
        pFrame.setSize(650, 300);
        pFrame.setVisible(true);
        JButton[] buttons = new JButton[50];
        toolsAction action = new toolsAction();
        for (int i = 0; i < 50; i++) {
            buttons[i] = new JButton("" + i);
            buttons[i].setActionCommand("" + i);
            buttons[i].addActionListener(action);
            pane.add(buttons[i]);
            buttons[i].setBounds(((i % 10) * 60), ((i / 10) * 40), 60, 40);
        }
    }
}

Answer 1

另一种方法是使用 Action和 key bindings .下面的示例将 10 个按钮绑定(bind)到数字键，还使用数字作为每个按钮的 MNEMONIC_KEY。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** @see http://stackoverflow.com/a/14182227/230513 */
public class Key {

    public static final int SIZE = 10;

    private static class ToolAction extends AbstractAction {

        public ToolAction(int i) {
            super(String.valueOf(i));
            putValue(MNEMONIC_KEY, KeyEvent.VK_0 + i);
        }

        @Override
        public void actionPerformed(ActionEvent ae) {
            System.out.println(ae.getActionCommand());
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame f = new JFrame("Frame");
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.setLayout(new GridLayout(0, SIZE / 2));
                for (int i = 0; i < SIZE; i++) {
                    final ToolAction toolAction = new ToolAction(i);
                    JButton b = new JButton(toolAction);
                    String name = b.getText();
                    b.getInputMap(JButton.WHEN_IN_FOCUSED_WINDOW).put(
                        KeyStroke.getKeyStroke(KeyEvent.VK_0 + i, 0), name);
                    b.getActionMap().put(name, toolAction);
                    f.add(b);
                }
                f.pack();
                f.setVisible(true);
            }
        });
    }
}