每行具有不同的JComboBox-es的JTable

Question

我创建了包含员工信息的JTable。在这个JTable中，我添加了名为“资历”的列。此列由JComboBox表示（每行的内容不同）。例如：

Row 1 |  JComboBox(){"Programmer","Web"}
Row 2 |  JComboBox(){"Writer","Editor"}

JComboBox内容取自列表 employees[row].getQualifience() 。

问题是在第1行和第2行中选择的项目是“程序员”，但是“程序员”不应该出现在第2行中。只有当我单击JComboBox时，才会出现正确的列表，即第2行-{“writer”，“editor”}。

    TableColumn column = table.getColumnModel().getColumn(5);
    column.setCellRenderer(getRenderer());

    private TableCellRenderer getRenderer() {
    return new TableCellRenderer() {

        private JComboBox<String> box = new JComboBox<String>();
        @Override
        public Component getTableCellRendererComponent(JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {            
            for (String q : employees[row].getQualification())
                box.addItem(q);
            box.setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
            box.setForeground(isSelected ? table.getSelectionForeground() : table.getForeground());
            return box;
           }
        };
    }

Answer 1

重写JTable的getCelleDitor()方法。类似于：

import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

public class TableComboBoxByRow extends JPanel
{
    List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3);

    public TableComboBoxByRow()
    {
        setLayout( new BorderLayout() );

        // Create the editors to be used for each row

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

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

        String[] items3 = { "Apple", "Orange", "Banana" };
        JComboBox<String> comboBox3 = new JComboBox<String>( 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 editors.get(row);
                else
                    return super.getCellEditor(row, column);
            }
        };

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

    private static void createAndShowUI()
    {
        JFrame frame = new JFrame("Table Combo Box by Row");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new TableComboBoxByRow() );
        frame.setSize(200, 200);
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}