当单元格中的JComboBox中存在ItemEvent时，如何获取CellRow

我有一个JTable，其中包含一个包含JComboBox的列。

我有一个附加到JComboBox的ItemListener，它对任何更改起作用。

但是，ItemListener没有获取已更改的ComboBox所在的Row的方法。

我需要行号以便在ComboBox发生更改时对同一行中的另一列进行操作。

任何帮助，将不胜感激。

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这是我的简短代码。 我想要完成的是在itemlistener获取更改时获取ComboBox的表行。

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; } } 

Answer 1

听起来你正在使用combobox作为编辑器 。 如果是这样， TableCellEditor方法getTableCellEditorComponent()将该row包含为参数。 这里有一个相关的例子。

附录：要更改已编辑的同一行中的值，只需让模型根据该行中的相关值返回“其他列”的正确值。 或者，在触发更新之前更新模型的setValueAt()方法中的相关值，如示例中所示 。

附录：根据您的示例，下面的代码会覆盖模型的getValueAt()方法，以使依赖列与项列保持同步。

 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); } }