s10.htm

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            <p>public class Test extends JApplet {<br>
              private JPopupMenu popup = new JPopupMenu();</p>
            <p> public void init() {<br>
              Container contentPane = getContentPane();<br>
              JLabel label = new JLabel(&quot;Click To Show Popup&quot;);</p>
            <p> popup.add(new JMenuItem(&quot;item one&quot;));<br>
              popup.add(new JMenuItem(&quot;item two&quot;));<br>
              popup.add(new JMenuItem(&quot;item three&quot;));<br>
              popup.add(new JMenuItem(&quot;item four&quot;));</p>
            <p> label.setHorizontalAlignment(JLabel.CENTER);<br>
              contentPane.add(label, BorderLayout.CENTER);</p>
            <p> label.addMouseListener(new MouseAdapter() {<br>
              public void mousePressed(MouseEvent e) {<br>
              //if(e.isPopupTrigger()) {<br>
              popup.setVisible(true);<br>
              //}<br>
              }<br>
              });<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 10.8.7 AWT兼容</p>
            <p>&nbsp;</p>
            <p> 10.9 JMenuBar</p>
            <p>&nbsp;</p>
            <p align="center"><b>例10-21 一个简单的菜单栏</b></p>
            <hr noshade size="1">
            import javax.swing.*;<br>
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import java.util.*;
            <p>public class Test extends JFrame {<br>
              public Test() {<br>
              final JMenuBar mb = new JMenuBar();<br>
              final JMenu fileMenu = new JMenu(&quot;File&quot;);<br>
              JMenuItem exitItem = new JMenuItem(&quot;Exit&quot;);</p>
            <p> fileMenu.add(&quot;New ...&quot;);<br>
              fileMenu.add(&quot;Open ...&quot;);<br>
              fileMenu.add(&quot;Save&quot;);<br>
              fileMenu.add(&quot;Save As ..&quot;);<br>
              fileMenu.addSeparator();<br>
              fileMenu.add(exitItem);</p>
            <p> mb.add(new JLabel(<br>
              new ImageIcon(&quot;smiley_face_small.gif&quot;)));</p>
            <p> mb.add(fileMenu);</p>
            <p> // Either one of the following two lines will <br>
              // attach the menu bar to the application<br>
              //setJMenuBar(mb);<br>
              getRootPane().setJMenuBar(mb);</p>
            <p> exitItem.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent e) {<br>
              dispose();<br>
              System.exit(0);<br>
              }<br>
              });<br>
              System.out.println(&quot;component count: &quot; + <br>
              mb.getComponentCount());<br>
              System.out.println(&quot;first component: &quot; + <br>
              (mb.getComponentAtIndex(0)).getClass().getName());</p>
            <p> System.out.println(&quot;menu count: &quot; + (mb.getMenuCount()));</p>
            <p> JMenu menu = mb.getMenu(0);<br>
              if(menu == null) System.out.println(&quot;null menu&quot;);<br>
              else System.out.println(&quot;got menu&quot;);<br>
              }<br>
              public static void main(String args[]) {<br>
              GJApp.launch(new Test(), <br>
              &quot;A Menu Bar&quot;,300,300,300,250); <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 size="1" noshade>
            <p> 10.9.1 菜单栏菜单和组件</p>
            <p>&nbsp;</p>
            <p align="center"><b>例10-22 菜单栏中的菜单和组件</b></p>
            <hr noshade size="1">
            import javax.swing.*;<br>
            import java.awt.*;<br>
            import java.awt.event.*;
            <p>public class Test extends JApplet {<br>
              public void init() {<br>
              Container contentPane = getContentPane();</p>
            <p> final JMenuBar mb = new JMenuBar();<br>
              JMenu fileMenu = new JMenu(&quot;File&quot;);<br>
              JMenu editMenu = new JMenu(&quot;Edit&quot;);<br>
              JMenuItem exitItem = new JMenuItem(&quot;Exit&quot;);<br>
              JButton compButton = new JButton(<br>
              &quot;show menubar components ...&quot;);<br>
              JButton menuButton = new JButton(<br>
              &quot;show menubar menus ...&quot;);</p>
            <p> fileMenu.add(&quot;New ...&quot;);<br>
              fileMenu.add(&quot;Open ...&quot;);<br>
              fileMenu.add(&quot;Save&quot;);<br>
              fileMenu.add(&quot;Save As ..&quot;);<br>
              fileMenu.addSeparator();<br>
              fileMenu.add(exitItem);</p>
            <p> editMenu.add(&quot;Undo&quot;);<br>
              editMenu.addSeparator();<br>
              editMenu.add(&quot;Cut&quot;);<br>
              editMenu.add(&quot;Copy&quot;);<br>
              editMenu.add(&quot;Paste&quot;);</p>
            <p> mb.setMargin(new Insets(30,20,10,5));<br>
              mb.add(new JLabel(new ImageIcon(&quot;smiley.gif&quot;)));<br>
              mb.add(fileMenu);<br>
              mb.add(editMenu);</p>
            <p> setJMenuBar(mb);<br>
              contentPane.setLayout(new FlowLayout());<br>
              contentPane.add(compButton);<br>
              contentPane.add(menuButton);</p>
            <p> exitItem.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent e) {<br>
              System.exit(0);<br>
              }<br>
              });<br>
              menuButton.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent e) {<br>
              Component c;<br>
              int cnt = mb.getMenuCount();</p>
            <p> for(int i=0; i &lt; cnt; ++i) {<br>
              c = mb.getMenu(i);<br>
              System.out.println(c);<br>
              System.out.println();<br>
              }<br>
              }<br>
              });<br>
              compButton.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent e) {<br>
              Component c;<br>
              int cnt = mb.getComponentCount();</p>
            <p> for(int i=0; i &lt; cnt; ++i) {<br>
              c = mb.getComponentAtIndex(i);<br>
              System.out.println(c);<br>
              System.out.println();<br>
              }<br>
              }<br>
              });<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 10.9.2 JMenuBar属性</p>
            <p>&nbsp;</p>
            <p> 10.9.3 JMenuBar事件</p>
            <p>&nbsp;</p>
            <p> 10.9.4JMenuBar类总结</p>
            <p>&nbsp;</p>
            <p> 10.9.5 AWT兼容</p>
            <p>&nbsp;</p>
            <p> 10.10 JToolBar</p>
            <p>&nbsp;</p>
            <p align="center"><b>例10-23 把组件添加到一个菜单栏中</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>
              JToolBar tb = new JToolBar();<br>
              JComboBox fontCombo = new JComboBox(),<br>
              fontSizeCombo = new JComboBox();</p>
            <p> JButton newButton = new JButton(new ImageIcon(&quot;new.gif&quot;)),<br>
              openButton = new JButton(new ImageIcon(&quot;open.gif&quot;)),<br>
              cutButton = new JButton(new ImageIcon(&quot;cut.gif&quot;)),<br>
              copyButton = new JButton(new ImageIcon(&quot;copy.gif&quot;)),<br>
              pasteButton = new JButton(new ImageIcon(&quot;paste.gif&quot;));</p>
            <p> fontCombo.addItem(&quot;Helvetica&quot;);<br>
              fontCombo.addItem(&quot;Palatino&quot;);<br>
              fontCombo.addItem(&quot;Courier&quot;);<br>
              fontCombo.addItem(&quot;Times&quot;);<br>
              fontCombo.addItem(&quot;Times-Roman&quot;);</p>
            <p> fontSizeCombo.addItem(&quot;10&quot;);<br>
              fontSizeCombo.addItem(&quot;12&quot;);<br>
              fontSizeCombo.addItem(&quot;14&quot;);<br>
              fontSizeCombo.addItem(&quot;16&quot;);<br>
              fontSizeCombo.addItem(&quot;18&quot;);</p>
            <p> tb.add(newButton);<br>
              tb.add(openButton);</p>
            <p> tb.addSeparator();</p>
            <p> tb.add(cutButton);<br>
              tb.add(copyButton);<br>
              tb.add(pasteButton);</p>
            <p> tb.addSeparator();</p>
            <p> tb.add(fontCombo);<br>
              tb.add(fontSizeCombo);</p>
            <p> contentPane.setLayout(new BorderLayout());<br>
              contentPane.add(tb, BorderLayout.NORTH);<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p align="center"><b>例10-24 把组件添加到一个工具条中</b>(方法2)</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>
              JToolBar tb = new JToolBar();<br>
              JComboBox fontCombo = new JComboBox(),<br>
              fontSizeCombo = new JComboBox();</p>
            <p> JButton newButton = new JButton(new ImageIcon(&quot;new.gif&quot;)),<br>
              openButton = new JButton(new ImageIcon(&quot;open.gif&quot;)),<br>
              cutButton = new JButton(new ImageIcon(&quot;cut.gif&quot;)),<br>
              copyButton = new JButton(new ImageIcon(&quot;copy.gif&quot;)),<br>
              pasteButton = new JButton(new ImageIcon(&quot;paste.gif&quot;));</p>
            <p> fontCombo.addItem(&quot;Helvetica&quot;);<br>
              fontCombo.addItem(&quot;Palatino&quot;);<br>
              fontCombo.addItem(&quot;Courier&quot;);<br>
              fontCombo.addItem(&quot;Times&quot;);<br>
              fontCombo.addItem(&quot;Times-Roman&quot;);</p>
            <p> fontSizeCombo.addItem(&quot;10&quot;);<br>
              fontSizeCombo.addItem(&quot;12&quot;);<br>
              fontSizeCombo.addItem(&quot;14&quot;);<br>
              fontSizeCombo.addItem(&quot;16&quot;);<br>
              fontSizeCombo.addItem(&quot;18&quot;);</p>
            <p> tb.add(newButton);<br>
              tb.add(openButton);</p>
            <p> tb.addSeparator();</p>
            <p> tb.add(cutButton);<br>
              tb.add(copyButton);<br>
              tb.add(pasteButton);</p>
            <p> tb.addSeparator();</p>
            <p> tb.add(fontCombo);<br>
              tb.add(fontSizeCombo);</p>
            <p> newButton.setAlignmentY(0.5f);<br>
              openButton.setAlignmen