清单 6 为您提供了一个完整的示例来试验所有这些新功能。修正鼠标滚轮侦听器后，您将可以不用按钮和滚动窗格。
清单 6 完整的示例
1 import java.awt.*;
2 import java.awt.event.*;
3 import javax.swing.*;
4 public class AwtTest {
5 private static final Color colors[] = {
6 Color.BLACK,
7 Color.BLUE,
8 Color.CYAN,
9 Color.DARK_GRAY,
10 Color.GRAY,
11 Color.GREEN,
12 Color.LIGHT_GRAY,
13 Color.MAGENTA,
14 Color.ORANGE,
15 Color.PINK,
16 Color.RED,
17 Color.WHITE,
18 Color.YELLOW
19 };
20 static int colorCounter;
21 private static final int UP = 1;
22 private static final int DOWN = 2;
23 // See bug 4475240
24 static JButton button = new JButton();
25 static JScrollPane pane = new JScrollPane(button);
26 private static void sizeScreen(JFrame frame) {
27 Toolkit kit = Toolkit.getDefaultToolkit();
28 Dimension screenSize = kit.getScreenSize();
29 GraphicsConfiguration config = frame.getGraphicsConfiguration();
30 Insets insets = kit.getScreenInsets(config);
31 screenSize.width -= (insets.left + insets.right);
32 screenSize.height -= (insets.top + insets.bottom);
33 frame.setSize(screenSize);
34 frame.setLocation(insets.left, insets.top);
35 }
36 private static void changeBackground(JFrame frame, int direction) {
37 // See bug 4475240
38 // w/o bug, change background of getContentPane()
39 button.setBackground(colors[colorCounter]);
40 // Update counter based on direction
41 if (direction == UP) {
42 colorCounter++;
43 } else {
44 --colorCounter;
45 }
46 // Wrap colors
47 if (colorCounter == colors.length) {
48 colorCounter = 0;
49 } else if (colorCounter < 0) {
50 colorCounter = colors.length-1;
51 }
52 }
53 private static void attachMouseWheelListener(final JFrame frame) {
54 MouseWheelListener listener = new MouseWheelListener() {
55 public void mouseWheelMoved(MouseWheelEvent e) {
56 int count = e.getWheelRotation();
57 int direction = (Math.abs(count) > 0) ? UP : DOWN;
58 changeBackground(frame, direction);
59 }
60 };
61 // See bug 4475240
62 // w/o bug, add to frame
63 button.addMouseWheelListener(listener);
64 }
65 private static void attachKeyListener(final JFrame frame) {
66 KeyListener listener = new KeyAdapter() {
67 public void keyPressed(KeyEvent e) {
68 if (e.getKeyCode() == KeyEvent.VK_SHIFT) {
69 int location = e.getKeyLocation();
70 int direction = (location == KeyEvent.KEY_LOCATION_LEFT) ?
71 UP : DOWN;
72 changeBackground(frame, direction);
73 }
74 }
75 };
76 // See bug 4475240
77 // w/o bug, add to frame
78 button.addKeyListener(listener);
79 }
80 public static void main(String args[]) {
81 JFrame frame = new JFrame("AwtTest");
82 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
83 // See bug 4475240
84 frame.getContentPane().add(button, BorderLayout.CENTER);
85 sizeScreen(frame);
86 changeBackground(frame, UP);
87 attachMouseWheelListener(frame);
88 attachKeyListener(frame);
89 frame.show();
90 }
91 }
92
2 import java.awt.event.*;
3 import javax.swing.*;
4 public class AwtTest {
5 private static final Color colors[] = {
6 Color.BLACK,
7 Color.BLUE,
8 Color.CYAN,
9 Color.DARK_GRAY,
10 Color.GRAY,
11 Color.GREEN,
12 Color.LIGHT_GRAY,
13 Color.MAGENTA,
14 Color.ORANGE,
15 Color.PINK,
16 Color.RED,
17 Color.WHITE,
18 Color.YELLOW
19 };
20 static int colorCounter;
21 private static final int UP = 1;
22 private static final int DOWN = 2;
23 // See bug 4475240
24 static JButton button = new JButton();
25 static JScrollPane pane = new JScrollPane(button);
26 private static void sizeScreen(JFrame frame) {
27 Toolkit kit = Toolkit.getDefaultToolkit();
28 Dimension screenSize = kit.getScreenSize();
29 GraphicsConfiguration config = frame.getGraphicsConfiguration();
30 Insets insets = kit.getScreenInsets(config);
31 screenSize.width -= (insets.left + insets.right);
32 screenSize.height -= (insets.top + insets.bottom);
33 frame.setSize(screenSize);
34 frame.setLocation(insets.left, insets.top);
35 }
36 private static void changeBackground(JFrame frame, int direction) {
37 // See bug 4475240
38 // w/o bug, change background of getContentPane()
39 button.setBackground(colors[colorCounter]);
40 // Update counter based on direction
41 if (direction == UP) {
42 colorCounter++;
43 } else {
44 --colorCounter;
45 }
46 // Wrap colors
47 if (colorCounter == colors.length) {
48 colorCounter = 0;
49 } else if (colorCounter < 0) {
50 colorCounter = colors.length-1;
51 }
52 }
53 private static void attachMouseWheelListener(final JFrame frame) {
54 MouseWheelListener listener = new MouseWheelListener() {
55 public void mouseWheelMoved(MouseWheelEvent e) {
56 int count = e.getWheelRotation();
57 int direction = (Math.abs(count) > 0) ? UP : DOWN;
58 changeBackground(frame, direction);
59 }
60 };
61 // See bug 4475240
62 // w/o bug, add to frame
63 button.addMouseWheelListener(listener);
64 }
65 private static void attachKeyListener(final JFrame frame) {
66 KeyListener listener = new KeyAdapter() {
67 public void keyPressed(KeyEvent e) {
68 if (e.getKeyCode() == KeyEvent.VK_SHIFT) {
69 int location = e.getKeyLocation();
70 int direction = (location == KeyEvent.KEY_LOCATION_LEFT) ?
71 UP : DOWN;
72 changeBackground(frame, direction);
73 }
74 }
75 };
76 // See bug 4475240
77 // w/o bug, add to frame
78 button.addKeyListener(listener);
79 }
80 public static void main(String args[]) {
81 JFrame frame = new JFrame("AwtTest");
82 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
83 // See bug 4475240
84 frame.getContentPane().add(button, BorderLayout.CENTER);
85 sizeScreen(frame);
86 changeBackground(frame, UP);
87 attachMouseWheelListener(frame);
88 attachKeyListener(frame);
89 frame.show();
90 }
91 }
92
