s06.htm

Java2Swingt界面设计

            <p>&nbsp;</p>
            <p align="center"><b>例6-8 使用BoxLayout</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import javax.swing.*;
            <p>public class Test extends JApplet {<br>
              public Test() {<br>
              Container contentPane = getContentPane();<br>
              ContainerWithBoxLayout yaxis = <br>
              new ContainerWithBoxLayout(BoxLayout.Y_AXIS);</p>
            <p> ContainerWithBoxLayout xaxis = <br>
              new ContainerWithBoxLayout(BoxLayout.X_AXIS);</p>
            <p> contentPane.setLayout(new FlowLayout());</p>
            <p> xaxis.add(new JButton(new ImageIcon(&quot;reach.gif&quot;)));<br>
              xaxis.add(new JButton(new ImageIcon(&quot;punch.gif&quot;)));<br>
              xaxis.add(new JButton(new ImageIcon(&quot;open_hand.gif&quot;)));</p>
            <p> yaxis.add(new JButton(new ImageIcon(&quot;ladybug.gif&quot;)));<br>
              yaxis.add(new JButton(new ImageIcon(&quot;crab.gif&quot;)));<br>
              yaxis.add(new JButton(new ImageIcon(&quot;frog.gif&quot;)));<br>
              yaxis.add(new JButton(new ImageIcon(&quot;snail.gif&quot;)));</p>
            <p> contentPane.add(xaxis);<br>
              contentPane.add(yaxis);<br>
              }<br>
              }<br>
              class ContainerWithBoxLayout extends JPanel { <br>
              public ContainerWithBoxLayout(int orientation) {<br>
              setLayout(new BoxLayout(this, orientation));<br>
              }<br>
              }</p>
            <hr noshade size="1">
            <p> 6.5.2 Box类</p>
            <p>&nbsp;</p>
            <p align="center"><b>例6-9 使用水平和垂直的膨胀体</b></p>
            <hr noshade size="1">
            <hr noshade size="1">
            <p> 6.6 进度监视器</p>
            <p>&nbsp;</p>
            <p> 6.6.1 ProgressMonitor</p>
            <p>　　　　<a href="s06_tu05.jar">图6-5</a> 使用一个进度监视器（注：此为一可点击执行的.jar文件，但需要下载到你的电脑上方可点击执行）</p>
            <p align="center"><b>例6-10 使用一个进度监视器</b></p>
            <hr noshade size="1">
            import javax.swing.*;<br>
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import java.util.*;<br>
            import java.io.*;
            <p>public class Test extends JFrame {<br>
              private JButton readButton = new JButton(&quot;read file&quot;);<br>
              private BufferedInputStream in;<br>
              private ProgressMonitor pm;<br>
              private String fileName = &quot;Test.java&quot;;</p>
            <p> public Test() {<br>
              final Container contentPane = getContentPane();</p>
            <p> contentPane.setLayout(new FlowLayout());<br>
              contentPane.add(readButton);</p>
            <p> readButton.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent e) {<br>
              try {<br>
              in = new BufferedInputStream(<br>
              new FileInputStream(fileName));</p>
            <p> pm = new ProgressMonitor(contentPane,<br>
              &quot;Reading File:&quot;,<br>
              fileName,<br>
              0, in.available());<br>
              }<br>
              catch(FileNotFoundException fnfx) {<br>
              fnfx.printStackTrace();<br>
              }<br>
              catch(IOException iox) {<br>
              iox.printStackTrace();<br>
              }</p>
            <p> ReadThread t = new ReadThread();<br>
              t.start();<br>
              }<br>
              });<br>
              }<br>
              class ReadThread extends Thread {<br>
              int i, cnt=0;<br>
              String s;</p>
            <p> public void run() {<br>
              try {<br>
              readButton.setEnabled(false);</p>
            <p> while(!pm.isCanceled() &amp;&amp; (i = in.read()) != -1) {<br>
              try {<br>
              Thread.currentThread().sleep(25);<br>
              }<br>
              catch(InterruptedException ex) {<br>
              ex.printStackTrace();<br>
              }<br>
              System.out.print((char)i);</p>
            <p> SwingUtilities.invokeLater(new Runnable(){<br>
              public void run() {<br>
              pm.setProgress(++cnt);<br>
              }<br>
              });<br>
              }<br>
              if(pm.isCanceled())<br>
              JOptionPane.showMessageDialog(<br>
              Test.this,<br>
              &quot;Operation Canceled!&quot;,<br>
              &quot;Cancellation&quot;,<br>
              JOptionPane.ERROR_MESSAGE);<br>
              }<br>
              catch(IOException ex) {<br>
              ex.printStackTrace();<br>
              }<br>
              finally {<br>
              try {<br>
              in.close();<br>
              }<br>
              catch(IOException ex2) {<br>
              ex2.printStackTrace();<br>
              }<br>
              }<br>
              readButton.setEnabled(true);<br>
              }<br>
              }<br>
              public static void main(String args[]) {<br>
              GJApp.launch(new Test(), <br>
              &quot;Using Progress Monitors&quot;,300,300,450,300);<br>
              }<br>
              }<br>
              class GJApp extends WindowAdapter {<br>
              static private JPanel statusArea = new JPanel();<br>
              static private JLabel status = new JLabel(&quot; &quot;);<br>
              static private ResourceBundle resources;</p>
            <p> public static void launch(final JFrame f, String title,<br>
              final int x, final int y, <br>
              final int w, int h) {<br>
              launch(f,title,x,y,w,h,null); <br>
              }<br>
              public static void launch(final JFrame f, String title,<br>
              final int x, final int y, <br>
              final int w, int h,<br>
              String propertiesFilename) {<br>
              f.setTitle(title);<br>
              f.setBounds(x,y,w,h);<br>
              f.setVisible(true);</p>
            <p> statusArea.setBorder(BorderFactory.createEtchedBorder());<br>
              statusArea.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));<br>
              statusArea.add(status);<br>
              status.setHorizontalAlignment(JLabel.LEFT);</p>
            <p> f.setDefaultCloseOperation(<br>
              WindowConstants.DISPOSE_ON_CLOSE);</p>
            <p> if(propertiesFilename != null) {<br>
              resources = ResourceBundle.getBundle(<br>
              propertiesFilename, Locale.getDefault());<br>
              }</p>
            <p> f.addWindowListener(new WindowAdapter() {<br>
              public void windowClosed(WindowEvent e) {<br>
              System.exit(0);<br>
              }<br>
              });<br>
              }<br>
              static public JPanel getStatusArea() {<br>
              return statusArea;<br>
              }<br>
              static public void showStatus(String s) {<br>
              status.setText(s);<br>
              }<br>
              static Object getResource(String key) {<br>
              if(resources != null) {<br>
              return resources.getString(key);<br>
              }<br>
              return null;<br>
              }<br>
              }</p>
            <hr noshade size="1">
            <p> 6.6.2 PropressMonitorInputStream</p>
            <p>&nbsp;</p>
            <p align="center"><b>例6-11 使用ProgressMonitorInputStream</b></p>
            <hr noshade size="1">
            import javax.swing.*;<br>
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import java.util.*;<br>
            import java.io.*;
            <p>public class Test extends JFrame {<br>
              private ProgressMonitorInputStream in;<br>
              private JButton readButton = new JButton(&quot;read file&quot;);</p>
            <p> public Test() {<br>
              final Container contentPane = getContentPane();<br>
              final String fileName = &quot;Test.java&quot;;</p>
            <p> contentPane.setLayout(new FlowLayout());<br>
              contentPane.add(readButton);</p>
            <p> readButton.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent e) {<br>
              try {<br>
              in = new ProgressMonitorInputStream(<br>
              contentPane,<br>
              &quot;Reading &quot; + fileName,<br>
              new FileInputStream(fileName));<br>
              }<br>
              catch(FileNotFoundException ex) {<br>
              ex.printStackTrace();<br>
              }</p>
            <p> ReadThread t = new ReadThread();<br>
              readButton.setEnabled(false);<br>
              t.start();<br>
              }<br>
              });<br>
              }<br>
              class ReadThread extends Thread {<br>
              public void run() {<br>
              int i;</p>
            <p> try {<br>
              while((i = in.read()) != -1) {<br>
              System.out.print((char)i);<br>
              try {<br>
              Thread.currentThread().sleep(10);<br>
              }<br>
              catch(Exception ex) {<br>
              ex.printStackTrace();<br>
              }<br>
              }<br>
              in.close();<br>
              }<br>
              catch(IOException ex) {<br>
              JOptionPane.showMessageDialog(<br>
              Test.this,<br>
              &quot;Operation Canceled!&quot;,<br>
              &quot;Cancellation&quot;,<br>
              JOptionPane.ERROR_MESSAGE);<br>
              }<br>
              readButton.setEnabled(true);<br>
              }<br>
              }<br>
              public static void main(String args[]) {<br>
              GJApp.launch(new Test(), <br>
              &quot;Using ProgressMonitorInputStream&quot;,<br>
              300,300,450,300);<br>
              }<br>
              }<br>
              class GJApp extends WindowAdapter {<br>
              static private JPanel statusArea = new JPanel();<br>
              static private JLabel status = new JLabel(&quot; &quot;);<br>
              static private ResourceBundle resources;</p>
            <p> public static void launch(final JFrame f, String title,<br>
              final int x, final int y, <br>
              final int w, int h) {<br>
              launch(f,title,x,y,w,h,null); <br>
              }<br>
              public static void launch(final JFrame f, String title,<br>
              final int x, final int y, <br>
              final int w, int h,<br>
              String propertiesFilename) {<br>
              f.setTitle(title);<br>
              f.setBounds(x,y,w,h);<br>
              f.setVisible(true);</p>
            <p> statusArea.setBorder(BorderFactory.createEtchedBorder());<br>
              statusArea.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));<br>
              statusArea.add(status);<br>
              status.setHorizontalAlignment(JLabel.LEFT);</p>
            <p> f.setDefaultCloseOperation(<br>
              WindowConstants.DISPOSE_ON_CLOSE);</p>
            <p> if(propertiesFilename != null) {<br>
              resources = ResourceBundle.getBundle(<br>
              propertiesFilename, Locale.getDefault());<br>
              }</p>
            <p> f.addWindowListener(new WindowAdapter() {<br>
              public void windowClosed(WindowEvent e) {<br>
              System.exit(0);<br>
              }<br>
              });<br>
              }<br>
              static public JPanel getStatusArea() {<br>
              return statusArea;<br>
              }<br>
              static public void showStatus(String s) {<br>
              status.setText(s);<br>
              }<br>
              static Object getResource(String key) {<br>
              if(resources != null) {<br>
              return resources.getString(key);<br>
              }<br>
              return null;<br>
              }<br>
              }</p>
            <hr noshade size="1">
            <p> 6.7 撤消/重复</p>
            <p>&nbsp;</p>
            <p> 6.7.1 一个简单的撤消/重复样例</p>
            <p>&nbsp;</p>
            <p align="center"><b>例6-12 一个简单的撤消/重复样例</b></p>
            <hr noshade size="1">
            import javax.swing.*;<br>
            import javax.swing.undo.*;<br>
            import java.awt.*;<br>
            import java.awt.event.*;
            <p>public class Test extends JApplet {<br>
              private JPanel colorPanel = new JPanel();<br>
              private BackgroundColorEdit undo = new BackgroundColorEdit();<br>
              private Color oldColor;</p>
            <p> public void init() {<br>
              colorPanel.setBorder(<br>
              BorderFactory.createTitledBorder(<br>
              &quot;Change color and subsequently undo &quot; +<br>
              &quot;from the Edit menu&quot;));</p>
            <p> makeMenuBar();<br>
              getContentPane().add(colorPanel, BorderLayout.CENTER);<br>
              }<br>
              private void makeMenuBar() {<br>
              JMenuBar menuBar = new JMenuBar();<br>
              JMenu editMenu = new JMenu(&quot;Edit&quot;);</p>
            <p> editMenu.add(new SetColorAction());<br>
              editMenu.add(new UndoAction());</p>
            <p> menuBar.add(editMenu);<br>
              setJMenuBar(menuBar);<br>
              }<br>
              class SetColorAction extends AbstractAction {<br>
              public SetColorAction() {<br>
              super(&quot;Set color ...&quot;);<br>
              }<br>
              public void actionPerformed(ActionEvent e) {<br>
              Color color = JColorChooser.showDialog(<br>
              Test.this, // parent component<br>
              &quot;Pick A Color&quot;, // dialog title<br>
              null); // initial color</p>
            <p> if(color != null) { <br>
              oldColor = colorPanel.getBackground();<br>
              colorPanel.setBackground(color);<br>
              }<br>
              }<br>
              }<br>
              class UndoAction extends AbstractAction {<br>
              public UndoAction() {<br>
              putValue(Action.NAME, undo.getUndoPresentationName());<br>
              }<br>
              public void actionPerformed(ActionEvent e) {<br>
              String name = (String)getValue(Action.NAME);<br>
              boolean isUndo = name.equals(<br>
              undo.getUndoPresentationName());</p>
            <p> if(isUndo) {<br>
              undo.undo(); <br>
              putValue(Action.NAME,<br>
              undo.getRedoPresentationName());<br>
              }<br>
              else {<br>
              undo.redo(); <br>