每行具有不同JComboBox-es的JTable [英] JTable with different JComboBox-es for each row

问题描述

我创建了JTable，其中包含有关员工的信息.在此JTable中，我添加了名为"Qualifications"的列.此列用JComboBox表示(每行的内容不同).例如:

I created JTable that contains information about employees. In this JTable I added the column called "Qualifications". This column is represented by JComboBox (different content at each row). For instance:

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

JComboBox内容取自List<String> employees[row].getQualification().

问题在于第1行和第2行中的所选项目是程序员"，但是程序员"不应出现在第2行中.只有当我单击JComboBox时，才会出现正确的列表，即第2行- {作家"，编辑者"}.

The problem is that the selected item in Row 1 and Row 2 is "Programmer", however "Programmer" should not appear in Row 2. Only when I click on JComboBox, the correct list appears, i.e. Row 2 - {"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;
           }
        };
    }

推荐答案

覆盖JTable的getCellEditor()方法.像这样:

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();
            }
        });
    }
}

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