当单元格内的JComboBox中有ItemEvent时，如何获取CellRow

import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.IOException;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

public class Example extends JFrame {

    private static final long serialVersionUID = 1L;
    public static int maxX, maxY;
    public static final String[] columnHeads = {"Col 1", "Col 2", "Col 3"};

    public static void main(String args[]) throws IOException {
        Example example = new Example();
    }

    public Example() {
        //Create Table Model
        DefaultTableModel model = new DefaultTableModel();

        for (int index = 0; index < columnHeads.length; index++) {
            model.addColumn(columnHeads[index]);
        }

        //Create Table
        JTable table = new JTable(model);
        JScrollPane scrollPane = new JScrollPane(table);

        //List for ComboBox
        String[] list = {"Item1", "Item2", "Item3"};

        //Create ComboBox
        JComboBox itemTypes = attachComboBoxRenderer(table, 2, list);

        //Attach Item Listener
        itemTypes.addItemListener(new ComboBoxListener());
        ((DefaultTableModel) table.getModel()).insertRow(
            table.getRowCount(), new Object[]{"C1", "C2", ""});
        this.setTitle("Example");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container container = getContentPane();

        //MAIN Panel
        final JPanel main = new JPanel();
        main.setLayout(new GridBagLayout());
        main.add(scrollPane);

        container.add(main);
        this.pack();
        this.setVisible(true);
    }

    public static JComboBox attachComboBoxRenderer(
        JTable table, int column, Object[] values) {
        JComboBox combo = new JComboBox(values);
        TableColumn col = table.getColumnModel().getColumn(column);
        col.setCellRenderer(new ComboBoxRenderer(values));
        col.setCellEditor(new DefaultCellEditor(combo));
        return combo;
    }
}

class ComboBoxListener implements ItemListener {

    private static final int SELECTED = 1;

    @Override
    public void itemStateChanged(ItemEvent e) {
        // Get the affected item
        Object item = e.getItem();
        if (item.toString() != null
            && !"".equals(item.toString())
            && e.getStateChange() == SELECTED) {
            System.out.println(item.toString() + " selected");
            //How do I get Row in the Table of the ComboBox that was changed?
        }
    }
}

class ComboBoxRenderer extends JComboBox implements TableCellRenderer {

    private static final long serialVersionUID = 1L;

    public ComboBoxRenderer(Object[] items) {
        super(items);
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value,
        boolean isSelected, boolean hasFocus, int row, int column) {
        if (isSelected) {
            setForeground(table.getSelectionForeground());
            super.setBackground(table.getSelectionBackground());
        } else {
            setForeground(table.getForeground());
            setBackground(table.getBackground());
        }
        // Select the current value
        setSelectedItem(value);
        return this;
    }
}

#1 楼

听起来您正在使用组合框作为编辑器。如果是这样，则TableCellEditor方法getTableCellEditorComponent()包括row作为参数。此处有一个相关的示例。

附录：要在已编辑的同一行中更改值，只需让模型根据相关值为“其他列”返回正确的值行。另外，如示例所示，在触发更新之前，请更新模型的setValueAt()方法中的相关值。

附录：根据您的示例，以下代码将覆盖模型的getValueAt()方法以保留相关列与项目列同步。

import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.IOException;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;

/** @see http://stackoverflow.com/questions/7350445 */
public class DependentColumn extends JFrame {

    private static final int DEPENDENT_COL = 1;
    private static final int ITEM_COL = 2;
    private static final String[] columnNames = {"Col 1", "Col 2", "Col 3"};

    public static void main(String args[]) throws IOException {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                DependentColumn dc = new DependentColumn();
            }
        });
    }

    public DependentColumn() {
        this.setTitle("Example");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create Model & Table
        DefaultTableModel model = new DefaultTableModel(columnNames, 0) {

            @Override
            public Object getValueAt(int row, int col) {
                if (col == DEPENDENT_COL) {
                    return "C2:" + this.getValueAt(row, ITEM_COL);
                } else {
                    return super.getValueAt(row, col);
                }
            }
        };
        for (int i = 0; i < 16; i++) {
            model.addRow(new Object[]{"C1", "C2", "Item1"});
        }
        JTable table = new JTable(model);
        table.setPreferredScrollableViewportSize(new Dimension(320, 120));

        //Create ComboBox
        String[] items = {"Item1", "Item2", "Item3"};
        JComboBox combo = new JComboBox(items);
        TableColumn col = table.getColumnModel().getColumn(ITEM_COL);
        col.setCellEditor(new DefaultCellEditor(combo));
        combo.addItemListener(new ItemListener() {

            @Override
            public void itemStateChanged(ItemEvent e) {
                if (e.getStateChange() == ItemEvent.SELECTED) {
                    System.out.println(e.getItem() + " selected");
                }
            }
        });

        this.add(new JScrollPane(table));
        this.pack();
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }
}

评论

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感谢您及时的回复。但是getTableCellEditor（）方法要求我给它一个行值，然后它返回CellEditor组件。我想从所选组件中找出行。

– JeffS
2011年9月9日15:27

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我已经在上面详细说明了；但是，我猜是在缺席的情况下。

–垃圾神
2011年9月9日19:07

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附录+1-这就是@JeffS的方式-从来没有直接听过编辑者的声音，他们的意思是恰好服务于一位大师（JTable f.i.），并且会愚弄其他所有人:-)

– kleopatra
2011-09-15 9:47

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@JeffS：我已经修改了您的scscce，以说明一种方法并认可kleopatra的深刻见解。

–垃圾神
2011-09-15 17:45

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