s19.htm

提供给JAVA编程者图形界面卷

              public int getColumnCount() { <br>
              return columnNames.length;<br>
              }<br>
              public String getColumnName(int col) {<br>
              return columnNames[col];<br>
              }<br>
              public Class getColumnClass(int col) {<br>
              return data[0][col].getClass();<br>
              }<br>
              public void setValueAt(Object value, int row, int col) {<br>
              data[row][col] = value;<br>
              fireTableCellUpdated(row, col);<br>
              }<br>
              public boolean isCellEditable(int row, int col) {<br>
              Class cls = getColumnClass(col);<br>
              String name = getColumnName(col);</p>
            <p> return (cls == Boolean.class &amp;&amp; !name.equals(&quot;Dolby&quot;)) 
              ||<br>
              cls == Integer.class || cls == Double.class;<br>
              }<br>
              public void updateBulbs(int selectedRow) {<br>
              for(int r=0; r &lt; getRowCount(); ++r) {<br>
              data[r][0] = new Boolean(r == selectedRow);<br>
              }<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p align="center">&nbsp; </p>
            <p align="center"><b>例19-12 使用绘制器和编辑器</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import java.text.*;<br>
            import java.util.*;<br>
            import javax.swing.*;<br>
            import javax.swing.event.*;<br>
            import javax.swing.table.*;
            <p>public class Test extends JFrame {<br>
              JTable table = new JTable(new StereoDeckModel());</p>
            <p> public Test() {<br>
              initializeInUseColumn();<br>
              initializePriceColumn();<br>
              initializeVolumeColumn();<br>
              sizeColumns();</p>
            <p> table.setSelectionMode(<br>
              ListSelectionModel.SINGLE_SELECTION);</p>
            <p> table.getSelectionModel().addListSelectionListener(<br>
              new ListSelectionListener() {<br>
              public void valueChanged(ListSelectionEvent e) {<br>
              StereoDeckModel model = <br>
              (StereoDeckModel)table.getModel(); </p>
            <p> if(!e.getValueIsAdjusting()) {<br>
              model.updateBulbs(table.getSelectedRow());<br>
              }<br>
              }<br>
              });<br>
              getContentPane().add(new JScrollPane(table),<br>
              BorderLayout.CENTER);<br>
              }<br>
              private void initializeInUseColumn() {<br>
              TableColumn inUseColumn = table.getColumn(&quot;In Use&quot;);<br>
              <br>
              inUseColumn.setCellRenderer(new BulbRenderer());<br>
              inUseColumn.setCellEditor(new BulbEditor());<br>
              }<br>
              private void initializePriceColumn() {<br>
              TableColumn priceColumn = table.getColumn(&quot;Price&quot;);<br>
              JComboBox combo = new JComboBox();</p>
            <p> // Combo box items are Numbers ...<br>
              combo.addItem(new Double(159.99));<br>
              combo.addItem(new Double(169.99));<br>
              combo.addItem(new Double(229.99));<br>
              combo.addItem(new Double(449.99));<br>
              combo.addItem(new Double(699.99));</p>
            <p> combo.setRenderer(new ListCellCurrencyRenderer());</p>
            <p> priceColumn.setCellRenderer(<br>
              new TableCellCurrencyRenderer());</p>
            <p> priceColumn.setCellEditor(new PriceEditor(combo));<br>
              }<br>
              private void initializeVolumeColumn() {<br>
              TableColumn volumeColumn = table.getColumn(&quot;Volume&quot;);<br>
              TableCellRenderer renderer = new VolumeRenderer();<br>
              TableCellEditor editor = new VolumeEditor();</p>
            <p> volumeColumn.setCellRenderer(renderer);<br>
              volumeColumn.setCellEditor(editor);</p>
            <p> Dimension ps = ((JPanel)renderer).getPreferredSize();<br>
              table.setRowHeight(ps.height);<br>
              }<br>
              public static void main(String args[]) {<br>
              GraphicJavaApplication.launch(<br>
              new Test(), &quot;Car Stereo Deck&quot;, 300,300,559,368);<br>
              }<br>
              private void sizeColumns() {<br>
              TableColumnModel tcm = table.getColumnModel();</p>
            <p> for(int i=0; i &lt; tcm.getColumnCount(); ++i) {<br>
              TableColumn column = tcm.getColumn(i);<br>
              int w = getPreferredWidthForColumn(column);</p>
            <p> column.setMinWidth(w);<br>
              column.setMaxWidth(w);<br>
              }<br>
              }<br>
              public int getPreferredWidthForColumn(TableColumn col) {<br>
              int hw = columnHeaderWidth(col), // hw = header width<br>
              cw = widestCellInColumn(col); // cw = column width</p>
            <p> return hw &gt; cw ? hw+10 : cw+10;<br>
              }<br>
              private int columnHeaderWidth(TableColumn col) {<br>
              TableCellRenderer renderer = col.getHeaderRenderer();</p>
            <p> Component comp = renderer.getTableCellRendererComponent(<br>
              table, col.getHeaderValue(), <br>
              false, false, 0, 0);</p>
            <p> return comp.getPreferredSize().width;<br>
              }<br>
              private int widestCellInColumn(TableColumn col) {<br>
              int c = col.getModelIndex(), width=0, maxw=0;</p>
            <p> for(int r=0; r &lt; table.getRowCount(); ++r) {<br>
              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>
              }<br>
              class ListCellCurrencyRenderer extends DefaultListCellRenderer {<br>
              public Component getListCellRendererComponent(<br>
              JList list,<br>
              Object value,<br>
              int index,<br>
              boolean isSelected,<br>
              boolean hasFocus) {<br>
              JLabel c = (JLabel)<br>
              super.getListCellRendererComponent(<br>
              list, value, index,<br>
              isSelected, hasFocus);</p>
            <p> Format format = NumberFormat.getCurrencyInstance();<br>
              c.setText(value == null ? &quot;&quot; : format.format(value));<br>
              return c;<br>
              }<br>
              }<br>
              class TableCellCurrencyRenderer extends DefaultTableCellRenderer 
              {<br>
              public void setValue(Object value) {<br>
              Format format = NumberFormat.getCurrencyInstance();<br>
              super.setValue(value == null ? &quot;&quot; : format.format(value));<br>
              }<br>
              }<br>
              class GraphicJavaApplication extends WindowAdapter {<br>
              public static void launch(final JFrame f, String title,<br>
              final int x, final int y, <br>
              final int w, int h) {<br>
              f.setTitle(title);<br>
              f.setBounds(x,y,w,h);<br>
              f.setVisible(true);</p>
            <p> f.setDefaultCloseOperation(<br>
              WindowConstants.DISPOSE_ON_CLOSE);</p>
            <p> f.addWindowListener(new WindowAdapter() {<br>
              public void windowClosed(WindowEvent e) {<br>
              System.exit(0);<br>
              }<br>
              });<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p align="center">&nbsp; </p>
            <p> 19.6.2 表格单绘制器</p>
            <p>&nbsp;</p>
            <p align="center"><b>例19-13 VolumeRenderer</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import javax.swing.*;<br>
            import javax.swing.event.*;<br>
            import javax.swing.table.*;
            <p>class VolumeRenderer extends JPanel<br>
              implements TableCellRenderer {<br>
              private JSlider slider = new JSlider();<br>
              private JLabel label = new JLabel(&quot;value&quot;);</p>
            <p> public VolumeRenderer() {<br>
              slider.setOrientation(SwingConstants.HORIZONTAL);<br>
              slider.setPreferredSize(new Dimension(200,30));<br>
              slider.putClientProperty(&quot;JSlider.isFilled&quot;,Boolean.TRUE);</p>
            <p> label.setHorizontalAlignment(JLabel.CENTER);<br>
              label.setHorizontalTextPosition(JLabel.CENTER);</p>
            <p> setLayout(new BorderLayout());<br>
              add(label, BorderLayout.NORTH);<br>
              add(slider, BorderLayout.CENTER);</p>
            <p> slider.addChangeListener(new ChangeListener() {<br>
              public void stateChanged(ChangeEvent e) {<br>
              label.setText(<br>
              Integer.toString(slider.getValue()));<br>
              }<br>
              });<br>
              }<br>
              public Component getTableCellRendererComponent(<br>
              JTable table, Object value,<br>
              boolean isSelected,<br>
              boolean hasFocus,<br>
              int row, int col) {<br>
              Integer v = (Integer)value;</p>
            <p> slider.setValue(v.intValue());<br>
              label.setText(v.toString());</p>
            <p> slider.setEnabled(isSelected);<br>
              label.setEnabled(isSelected);</p>
            <p> return this;<br>
              }<br>
              public JSlider getSlider() {<br>
              return slider;<br>
              }<br>
              public JLabel getLabel() {<br>
              return label;<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p align="center">&nbsp; </p>
            <p> 19.6.3 Default Table Cell Renderer类</p>
            <p>&nbsp;</p>
            <p align="center"><b>例19-14 BulbRenderer</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import javax.swing.*;<br>
            import javax.swing.table.*;
            <p>class BulbRenderer extends DefaultTableCellRenderer {<br>
              private ImageIcon darkBulb = new ImageIcon(&quot;button.jpg&quot;),<br>
              brightBulb = new ImageIcon(&quot;button_lit.jpg&quot;);</p>
            <p> public BulbRenderer() {<br>
              setHorizontalAlignment(JLabel.CENTER);<br>
              }<br>
              public Component getTableCellRendererComponent(<br>
              JTable table, Object value,<br>
              boolean isSelected,<br>
              boolean hasFocus,<br>
              int row, int col) {<br>
              Boolean b = (Boolean)value;<br>
              setIcon(b.booleanValue() ? brightBulb : darkBulb);<br>
              return this;<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p align="center">&nbsp; </p>
            <p> 19.6.4 表格格式化绘制器</p>
            <p>&nbsp;</p>
            <p align="center">&nbsp; </p>
            <p> 19.6.5 单元编辑器</p>
            <p>&nbsp;</p>
            <p align="center">&nbsp; </p>
            <p> 19.6.6 表格单编辑器</p>
            <p>&nbsp;</p>
            <p align="center">&nbsp; </p>
            <p> 19.6.7 实现TableCellEditor接口</p>
            <p>&nbsp;</p>
            <p align="center"><b>例19-15 AbstractCellEditor</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import javax.swing.*;<br>
            import javax.swing.event.*;<br>
            import javax.swing.table.*;<br>
            import javax.swing.tree.*;<br>
            import java.awt.event.MouseEvent;<br>
            import java.util.EventObject;
            <p>abstract public class AbstractCellEditor <br>
              implements TableCellEditor {<br>
              protected EventListenerList listenerList = <br>
              new EventListenerList();<br>
              protected Object value;<br>
              protected ChangeEvent changeEvent = null;<br>
              protected int clickCountToStart = 1;</p>
            <p> public Object getCellEditorValue() {<br>
              return value;<br>
              }<br>
              public void setCellEditorValue(Object value) {<br>
              this.value = value;<br>
              }<br>
              public void setClickCo