如何通知 TableCellEditor 表格行被删除？

Question

我尝试实现一个包含一些字段和一个删除按钮的 TableCellEditor。效果很好，但是当行被删除时，被删除单元格中的内容（使用 TableCellEditor 渲染）没有更新。

删除行时，我尝试在模型中同时调用fireTableRowsDeleted(row, row) 和fireTableDataChanged()，但它似乎没有通知TableCellEditor。当我选择另一行时，它可以工作，并且行索引再次使用 TableCellRenderer 呈现。

关于如何在删除时通知 TableCellEditor 有什么建议吗？

1. 按下删除按钮

2. 行已删除，但 CellEditor 内容未更新

3. 当再次使用 CellRenderer 时，行内容已更新。

代码如下：

public class StringTableDemo extends JFrame {

    public StringTableDemo() {
        
        final StringTableModel model = new StringTableModel();
        model.addRow("Jonas");
        model.addRow("Hello");
        model.addRow("World");
        
        RendererAndEditor rendererAndEditor = new RendererAndEditor(model);
        
        JTable table = new JTable(model);
        table.setDefaultRenderer(Record.class, rendererAndEditor);
        table.setDefaultEditor(Record.class, rendererAndEditor);
        
        add(new JScrollPane(table), BorderLayout.CENTER);
        pack();
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }
    
    class Record {
        String string;
        boolean isDeleted;
    }
    
    class StringTableModel extends AbstractTableModel {

        private final List<Record> data = new ArrayList<Record>();
        
        @Override
        public int getColumnCount() {
            return 1;
        }

        @Override
        public int getRowCount() {
            return data.size();
        }

        @Override
        public Object getValueAt(int row, int column) {
            return data.get(row);
        }
        
        @Override
        public Class<?> getColumnClass(int column) {
            return Record.class;
        }
        
        @Override
        public boolean isCellEditable(int row, int column) {
            return true;
        }
        
        @Override
        public void setValueAt(Object aValue, int row, int column) {
            if(aValue instanceof Record) {
                Record r = (Record)aValue;
                if(!r.isDeleted) {
                    data.set(row, r);
                    fireTableRowsUpdated(row, column);
                }
            } else throw new IllegalStateException("aValue is not a Record");
        }
        
        public void addRow(String s) {
            Record r = new Record();
            r.string = s;
            r.isDeleted = false;
            data.add(r);
            fireTableRowsInserted(data.size()-1, data.size()-1);
        }
        
        public void removeRow(int row) {
            data.remove(row);
            //fireTableRowsDeleted(row, row);
            fireTableDataChanged();
            
            System.out.println("row " + row + " deleted");
        }

    }
    
    class CellPanel extends JPanel {
        private final Action removeAction = new AbstractAction("x") {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                model.removeRow(index);
                isDeleted = true;
            }
            
        };
        private final JButton removeBtn = new JButton(removeAction);
        private final JTextField field = new JTextField();
        private final StringTableModel model;
        private int index;
        private boolean isDeleted = false;
        public CellPanel(StringTableModel model) {
            super(new BorderLayout());
            this.model = model;
            add(field, BorderLayout.CENTER);
            add(removeBtn, BorderLayout.EAST);
        }
        
        public Record getRecord() {
            Record r = new Record();
            r.string = field.getText();
            r.isDeleted = isDeleted;
            return r;
        }
        
        public void setRecord(Record r, int index) {
            field.setText(r.string);
            this.index = index;
        }
    }
    
    class RendererAndEditor extends AbstractCellEditor implements
     TableCellEditor, TableCellRenderer {

        private final CellPanel renderer;
        private final CellPanel editor;
        
        public RendererAndEditor(StringTableModel model) {
            renderer = new CellPanel(model);
            editor = new CellPanel(model);
        }
        
        @Override
        public Object getCellEditorValue() {
            return editor.getRecord();
        }

        @Override
        public Component getTableCellRendererComponent(JTable table,
                Object value, boolean isSelected, boolean hasFocus, 
                       int row, int column) {
            
            renderer.setRecord((Record)value, row);
            return renderer;
        }

        @Override
        public Component getTableCellEditorComponent(JTable table, 
                Object value, boolean isSelected, int row, int column) {
            editor.setRecord((Record)value, row);
            return editor;
        }
        
    }

    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new StringTableDemo();
            }
            
        });
    }
}

Answer 1

那是因为您的CellEditor 在您单击删除按钮时没有注意到它必须停止编辑单元格。

一个简单的解决方案是在您的CellEditor 中添加另一个ActionListener，并在您每次点击它时调用stopCellEditing()。这应该有效：

public RendererAndEditor( StringTableModel model )
{
  renderer = new CellPanel( model );
  editor = new CellPanel( model );

  editor.getRemoveBtn().addActionListener( new ActionListener()
  {
    @Override
    public void actionPerformed( ActionEvent e )
    {
      stopCellEditing();
    }
  });
}