TrackEvent.java Source code

Introduction

Here is the source code for TrackEvent.java

Source

// : c14:TrackEvent.java
// Show events as they happen.
// <applet code=TrackEvent width=700 height=500></applet>
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.HashMap;

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class TrackEvent extends JApplet {
    private HashMap h = new HashMap();

    private String[] event = { "focusGained", "focusLost", "keyPressed", "keyReleased", "keyTyped", "mouseClicked",
            "mouseEntered", "mouseExited", "mousePressed", "mouseReleased", "mouseDragged", "mouseMoved" };

    private MyButton b1 = new MyButton(Color.BLUE, "test1"), b2 = new MyButton(Color.RED, "test2");

    class MyButton extends JButton {
        void report(String field, String msg) {
            ((JTextField) h.get(field)).setText(msg);
        }

        FocusListener fl = new FocusListener() {
            public void focusGained(FocusEvent e) {
                report("focusGained", e.paramString());
            }

            public void focusLost(FocusEvent e) {
                report("focusLost", e.paramString());
            }
        };

        KeyListener kl = new KeyListener() {
            public void keyPressed(KeyEvent e) {
                report("keyPressed", e.paramString());
            }

            public void keyReleased(KeyEvent e) {
                report("keyReleased", e.paramString());
            }

            public void keyTyped(KeyEvent e) {
                report("keyTyped", e.paramString());
            }
        };

        MouseListener ml = new MouseListener() {
            public void mouseClicked(MouseEvent e) {
                report("mouseClicked", e.paramString());
            }

            public void mouseEntered(MouseEvent e) {
                report("mouseEntered", e.paramString());
            }

            public void mouseExited(MouseEvent e) {
                report("mouseExited", e.paramString());
            }

            public void mousePressed(MouseEvent e) {
                report("mousePressed", e.paramString());
            }

            public void mouseReleased(MouseEvent e) {
                report("mouseReleased", e.paramString());
            }
        };

        MouseMotionListener mml = new MouseMotionListener() {
            public void mouseDragged(MouseEvent e) {
                report("mouseDragged", e.paramString());
            }

            public void mouseMoved(MouseEvent e) {
                report("mouseMoved", e.paramString());
            }
        };

        public MyButton(Color color, String label) {
            super(label);
            setBackground(color);
            addFocusListener(fl);
            addKeyListener(kl);
            addMouseListener(ml);
            addMouseMotionListener(mml);
        }
    }

    public void init() {
        Container c = getContentPane();
        c.setLayout(new GridLayout(event.length + 1, 2));
        for (int i = 0; i < event.length; i++) {
            JTextField t = new JTextField();
            t.setEditable(false);
            c.add(new JLabel(event[i], JLabel.RIGHT));
            c.add(t);
            h.put(event[i], t);
        }
        c.add(b1);
        c.add(b2);
    }

    public static void main(String[] args) {
        run(new TrackEvent(), 700, 500);
    }

    public static void run(JApplet applet, int width, int height) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(applet);
        frame.setSize(width, height);
        applet.init();
        applet.start();
        frame.setVisible(true);
    }
} ///:~