s19.htm

提供给JAVA编程者图形界面卷

              TableCellRenderer renderer = <br>
              table.getCellRenderer(r,c);</p>
            <p> Component comp = <br>
              renderer.getTableCellRendererComponent(<br>
              table, table.getValueAt(r,c), <br>
              false, false, r, c);</p>
            <p> width = comp.getPreferredSize().width;<br>
              maxw = width &gt; maxw ? width : maxw;<br>
              }<br>
              return maxw;<br>
              }<br>
              public static void main(String args[]) {<br>
              GJApp.launch(<br>
              new Test(),&quot;Setting Column Widths&quot;,300,300,320,140);<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 align="center">&nbsp; </p>
            <p> 19.4 表格列模型</p>
            <p>&nbsp; </p>
            <p> 19.4.1 DefaultTableColumnModel类</p>
            <p>&nbsp;</p>
            <p align="center">&nbsp; </p>
            <p align="center">&nbsp; </p>
            <p> 19.4.2 列边距</p>
            <p>&nbsp;</p>
            <p align="center"><b>例19-7 设置列边距</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import javax.swing.*;<br>
            import javax.swing.event.*;<br>
            import javax.swing.table.*;<br>
            import java.util.*;
            <p>public class Test extends JFrame {<br>
              JTable table = new JTable(<br>
              new AbstractTableModel() {<br>
              public int getRowCount() { return 10; }<br>
              public int getColumnCount() { return 10; }</p>
            <p> public Object getValueAt(int row, int col) {<br>
              return &quot;(&quot; + Integer.toString(row) + &quot;,&quot; +<br>
              Integer.toString(col) + &quot;)&quot;;<br>
              }<br>
              });</p>
            <p> public Test() {<br>
              Container cp = getContentPane();<br>
              cp.add(new JScrollPane(table), BorderLayout.CENTER);<br>
              cp.add(new ControlPanel(), BorderLayout.NORTH);<br>
              }<br>
              class ControlPanel extends JPanel {<br>
              private JSlider slider = new JSlider(<br>
              JSlider.HORIZONTAL,0,100,<br>
              table.getColumnModel().getColumnMargin());</p>
            <p> private JLabel label = new JLabel();</p>
            <p> public ControlPanel() {<br>
              add(new JLabel(&quot;Column Margin:&quot;));<br>
              add(slider);<br>
              add(label);</p>
            <p> label.setText(<br>
              Integer.toString(<br>
              table.getColumnModel().getColumnMargin()));</p>
            <p> slider.addChangeListener(new ChangeListener() {<br>
              public void stateChanged(ChangeEvent e) {<br>
              table.getColumnModel().setColumnMargin(<br>
              slider.getValue());<br>
              }<br>
              });<br>
              table.getColumnModel().addColumnModelListener(<br>
              new TableColumnModelListener() {<br>
              public void columnMarginChanged(ChangeEvent e) {<br>
              TableColumnModel m = table.getColumnModel();<br>
              label.setText(<br>
              Integer.toString(m.getColumnMargin()));<br>
              }</p>
            <p> // unfortunately, Swing does not have many<br>
              // event adapter classes ...<br>
              public void columnAdded(TableColumnModelEvent e) {<br>
              }<br>
              public void columnMoved(TableColumnModelEvent e) {<br>
              }<br>
              public void columnRemoved(<br>
              TableColumnModelEvent e) {<br>
              }<br>
              public void columnSelectionChanged(<br>
              ListSelectionEvent e) {<br>
              }<br>
              });<br>
              }<br>
              }<br>
              public static void main(String args[]) {<br>
              GJApp.launch(new Test(),<br>
              &quot;Column Margins&quot;,150,150,500,200); <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 align="center">&nbsp; </p>
            <p> 19.4.3 隐藏列</p>
            <p>&nbsp;</p>
            <p align="center"><b>例19-8 添加和删除列</b></p>
            <hr noshade size="1">
            import javax.swing.*;<br>
            import javax.swing.table.*;<br>
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import java.util.*;
            <p>public class Test extends JFrame {<br>
              JTable table = new JTable(<br>
              new Object[][] {<br>
              {&quot;Mouse&quot;, &quot;Mighty&quot;, &quot;M.&quot; },<br>
              {&quot;Mouse&quot;, &quot;Polly&quot;, &quot;A.&quot; },<br>
              {&quot;Doright&quot;, &quot;Dudley&quot;, &quot;L.&quot; }<br>
              },<br>
              new Object[] {<br>
              &quot;Last Name&quot;, &quot;First Name&quot;, &quot;Middle Initial&quot; 
              <br>
              }<br>
              );<br>
              public Test() {<br>
              Container cp = getContentPane();</p>
            <p> cp.add(new JScrollPane(table), BorderLayout.CENTER);<br>
              cp.add(new ControlPanel(), BorderLayout.NORTH);<br>
              }<br>
              class ControlPanel extends JPanel {<br>
              private JCheckBox checkBox = new JCheckBox(<br>
              &quot;First Name Column Showing&quot;);<br>
              public ControlPanel() {<br>
              final TableColumnModel tcm = table.getColumnModel();<br>
              final TableColumn firstNameColumn = <br>
              table.getColumn(&quot;First Name&quot;);</p>
            <p> checkBox.setSelected(true);<br>
              add(checkBox);</p>
            <p> checkBox.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent event) {<br>
              if(checkBox.isSelected()) {<br>
              tcm.addColumn(firstNameColumn);<br>
              tcm.moveColumn(2,1);<br>
              }<br>
              else {<br>
              tcm.removeColumn(firstNameColumn);<br>
              }<br>
              table.sizeColumnsToFit(-1);<br>
              }<br>
              });<br>
              }<br>
              }<br>
              public static void main(String args[]) {<br>
              GJApp.launch(<br>
              new Test(), &quot;Showing/Hiding Columns&quot;,300,300,450,175);<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>