如何在单元格编辑后维护JTable单元格渲染

1 回答

• 10

  当编辑器结束时，表的 editingStopped() 方法通过 getCellEditorValue() 收集新值并将其用于模型中的 setValueAt() . 反过来，该模型应该是 fireTableCellUpdated() ，它将调用规定的渲染器 . 扩展default应该足以处理 Number 格式化 . 在其他情况下，使用渲染器的实例作为编辑器组件可能会很方便;这个example显示了一个典型的实现 .

  附录：这是使用默认编辑器和渲染器实现的基本示例 .

  附录：感谢来自@mKorbel的有用评论，我正在编辑文本，如@ camickr的文章_1795942中所述 .

  

  package overflow;
  
  import java.awt.Component;
  import java.awt.Dimension;
  import java.awt.EventQueue;
  import java.awt.event.MouseEvent;
  import java.text.NumberFormat;
  import java.util.EventObject;
  import javax.swing.DefaultCellEditor;
  import javax.swing.JFrame;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  import javax.swing.JTable;
  import javax.swing.JTextField;
  import javax.swing.table.DefaultTableCellRenderer;
  import javax.swing.table.DefaultTableModel;
  import javax.swing.text.JTextComponent;
  
  /** @see http://stackoverflow.com/a/10067560/230513 */
  public class RenderEditNumber extends JPanel {
  
      private NumberFormat nf = NumberFormat.getCurrencyInstance();
  
      public RenderEditNumber() {
          DefaultTableModel model = new DefaultTableModel(
              new String[]{"Amount"}, 0) {
  
              @Override
              public Class<?> getColumnClass(int columnIndex) {
                  return Double.class;
              }
          };
          for (int i = 0; i < 16; i++) {
              model.addRow(new Object[]{Double.valueOf(i)});
          }
          JTable table = new JTable(model) {
  
              @Override // Always selectAll()
              public boolean editCellAt(int row, int column, EventObject e) {
                  boolean result = super.editCellAt(row, column, e);
                  final Component editor = getEditorComponent();
                  if (editor == null || !(editor instanceof JTextComponent)) {
                      return result;
                  }
                  if (e instanceof MouseEvent) {
                      EventQueue.invokeLater(new Runnable() {
  
                          @Override
                          public void run() {
                              ((JTextComponent) editor).selectAll();
                          }
                      });
                  } else {
                      ((JTextComponent) editor).selectAll();
                  }
                  return result;
              }
          };
          table.setPreferredScrollableViewportSize(new Dimension(123, 123));
          table.setDefaultRenderer(Double.class, new CurrencyRenderer(nf));
          table.setDefaultEditor(Double.class, new CurrencyEditor(nf));
          this.add(new JScrollPane(table));
      }
  
      private static class CurrencyRenderer extends DefaultTableCellRenderer {
  
          private NumberFormat formatter;
  
          public CurrencyRenderer(NumberFormat formatter) {
              this.formatter = formatter;
              this.setHorizontalAlignment(JLabel.RIGHT);
          }
  
          @Override
          public void setValue(Object value) {
              setText((value == null) ? "" : formatter.format(value));
          }
      }
  
      private static class CurrencyEditor extends DefaultCellEditor {
  
          private NumberFormat formatter;
          private JTextField textField;
  
          public CurrencyEditor(NumberFormat formatter) {
              super(new JTextField());
              this.formatter = formatter;
              this.textField = (JTextField) this.getComponent();
              textField.setHorizontalAlignment(JTextField.RIGHT);
              textField.setBorder(null);
          }
  
          @Override
          public Object getCellEditorValue() {
              try {
                  return new Double(textField.getText());
              } catch (NumberFormatException e) {
                  return Double.valueOf(0);
              }
          }
  
          @Override
          public Component getTableCellEditorComponent(JTable table,
              Object value, boolean isSelected, int row, int column) {
              textField.setText((value == null)
                  ? "" : formatter.format((Double) value));
              return textField;
          }
      }
  
      private void display() {
          JFrame f = new JFrame("RenderEditNumber");
          f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          f.add(this);
          f.pack();
          f.setLocationRelativeTo(null);
          f.setVisible(true);
      }
  
      public static void main(String[] args) {
          EventQueue.invokeLater(new Runnable() {
  
              @Override
              public void run() {
                  new RenderEditNumber().display();
              }
          });
      }
  }
  

  回复于 2024-04-26T19:26:27+08:00