3

我尝试实现一个包含一些字段和一个删除按钮的 TableCellEditor。它工作得很好，但是当该行被删除时，被删除单元格中的内容（使用 TableCellEditor 呈现）不会更新。

当行被删除时，我尝试在模型中调用fireTableRowsDeleted(row, row)和调用fireTableDataChanged()，但它似乎没有通知 TableCellEditor。当我选择另一行时它起作用，并且行索引再次使用 TableCellRenderer 呈现。

有关如何在删除时通知 TableCellEditor 的任何建议？

  1. 按下删除按钮

    在此处输入图像描述

  2. 行已删除，但 CellEditor 内容未更新

    在此处输入图像描述

  3. 当再次使用 CellRenderer 时，行内容已更新。

    在此处输入图像描述

这是代码：

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();
            }
            
        });
    }
}
4

1 回答 1

4

那是因为CellEditor当您单击删除按钮时，您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将另一个添加ActionListener到您的并在您每次单击它时CellEditor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();
    }
  });
}
于 2012-01-10T09:58:26.380 回答