keystroketest.java

《Java2图形设计卷II：Swing》配套光盘源码

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

public class KeystrokeTest extends JApplet {
	private JButton button = new JButton("button");

	public void init() {
		Container	contentPane = getContentPane();
		JPanel		panel 		= new JPanel();
		JCheckBox 	checkbox 	= new JCheckBox("checkbox");
		JButton		southButton = new JButton("south button");
		Listener	listener 	= new Listener();

		panel.setBorder(
			BorderFactory.createTitledBorder(
				("Ancestor of button and checkbox")));

		checkbox.registerKeyboardAction(
				listener,
				KeyStroke.getKeyStroke(KeyEvent.VK_F,0,false),
				JComponent.WHEN_FOCUSED);

		panel.registerKeyboardAction(
				listener,
				KeyStroke.getKeyStroke(KeyEvent.VK_A, 
				InputEvent.ALT_MASK, false),
				JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);

		southButton.registerKeyboardAction(
				listener,
				KeyStroke.getKeyStroke(KeyEvent.VK_W, 0, true),
				JComponent.WHEN_IN_FOCUSED_WINDOW);

		panel.add(button);
		panel.add(checkbox);

		contentPane.add(panel, "Center");
		contentPane.add(southButton, "South");
	}
}
class Listener implements ActionListener {
	public void actionPerformed(ActionEvent e) {
		Object src	 = e.getSource();
		String cname = src.getClass().getName();

		if(src instanceof JCheckBox) {
			System.out.print("'f' key PRESSED when checkbox");
			System.out.println(" had focus");
		}
		else if(src instanceof JPanel) {
			System.out.print("'ALT-a' key PRESSED when ancestor");
			System.out.println(" of titled panel had focus");
		}
		else if(src instanceof JButton) {
			System.out.print("'w' key RELEASED when any");
			System.out.println(" component in window had focus");
		}
		System.out.println("Source:  " + cname);
		System.out.println();
	}
}