如何在JTable中为一列添加不同的单元格编辑器？

Question

我有一个带有两列的JTable,两者都是JComboBox,为此我实现了自己的Model和overrode方法.我覆盖的方法之一是:

public Class getColumnClass(int index) {
  return JComboBox.class;
}

还创建了我自己的ComboBoxEditor和ComboBoxRender类,并设置了cellEditor和cellRenderer:

column.setCellEditor(new ComboBoxEditor());
column.setCellRenderer(new ComboBoxRenderer());

现在我想进行更改,因此对于第一列,一些单元格是JComboBox,一些单元格是标准文本数据.

我怎样才能做到这一点？

任何有用的建议都会受到欢迎

Answer 1

我通常覆盖table.getCellEditor(...)方法以返回适当的编辑器.

也许是这样的:

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

public class TableComboBoxByRow extends JFrame
{
    ArrayList editors = new ArrayList(3);

    public TableComboBoxByRow()
    {
        // Create the editors to be used for each row

        String[] items1 = { "Red", "Blue", "Green" };
        JComboBox comboBox1 = new JComboBox( items1 );
        DefaultCellEditor dce1 = new DefaultCellEditor( comboBox1 );
        editors.add( dce1 );

        String[] items2 = { "Circle", "Square", "Triangle" };
        JComboBox comboBox2 = new JComboBox( items2 );
        DefaultCellEditor dce2 = new DefaultCellEditor( comboBox2 );
        editors.add( dce2 );

        String[] items3 = { "Apple", "Orange", "Banana" };
        JComboBox comboBox3 = new JComboBox( items3 );
        DefaultCellEditor dce3 = new DefaultCellEditor( comboBox3 );
        editors.add( dce3 );

        //  Create the table with default data

        Object[][] data =
        {
            {"Color", "Red"},
            {"Shape", "Square"},
            {"Fruit", "Banana"},
            {"Plain", "Text"}
        };
        String[] columnNames = {"Type","Value"};
        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        JTable table = new JTable(model)
        {
            //  Determine editor to be used by row
            public TableCellEditor getCellEditor(int row, int column)
            {
                int modelColumn = convertColumnIndexToModel( column );

                if (modelColumn == 1 && row < 3)
                    return (TableCellEditor)editors.get(row);
                else
                    return super.getCellEditor(row, column);
            }
        };
        System.out.println(table.getCellEditor());

        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );
    }

    public static void main(String[] args)
    {
        TableComboBoxByRow frame = new TableComboBoxByRow();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible(true);
    }
}

Answer 2

您需要实现自己的javax.swing.table.TableCellRenderer,getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) 根据您的业务逻辑返回不同的渲染器.TableCellEditor接口相同.