在JTable中监听JCheckBox的变化

Question

如何监听包含JCheckBox的JTable列中的更改？我想知道用户何时选择/取消选中复选框.该列的类设置为boolean,因此它将自动呈现为JCheckBox.

Answer 1

我认为你想要的是TableModel通过使用a 来监听数据的变化TableModelListener.也可以使用自定义编辑器,但我认为这TableModelListener是最简单的方法.您的覆盖tableChanged方法可能看起来像这样

@Override
public void tableChanged(TableModelEvent e) {
    int row = e.getFirstRow();
    int column = e.getColumn();
    if (column == BOOLEAN_COLUMN) {
        TableModel model = (TableModel) e.getSource();
        String columnName = model.getColumnName(column);
        Boolean checked = (Boolean) model.getValueAt(row, column);
        if (checked) {
            System.out.println(columnName + ": " + true);
        } else {
            System.out.println(columnName + ": " + false);
        }
    }
}

这是一个完整的运行示例

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;

public class TestTableModelListener {
    private static final int BOOLEAN_COLUMN = 2;

    public TestTableModelListener() {
        JTable table = createTable();
        table.getModel().addTableModelListener(new CheckBoxModelListener());

        JFrame frame = new JFrame();
        frame.add(new JScrollPane(table));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private JTable createTable() {
        String[] cols = {"COL", "COL", "COL"};
        Object[][] data = {{"Hello", "Hello", false}, {"Hello", "Hello", false}};
        DefaultTableModel model = new DefaultTableModel(data, cols) {
            @Override
            public Class getColumnClass(int column) {
                return column == BOOLEAN_COLUMN ? Boolean.class : String.class;
            }
        };
        JTable table = new JTable(model);
        return table;
    }

    public class CheckBoxModelListener implements TableModelListener {

        public void tableChanged(TableModelEvent e) {
            int row = e.getFirstRow();
            int column = e.getColumn();
            if (column == BOOLEAN_COLUMN) {
                TableModel model = (TableModel) e.getSource();
                String columnName = model.getColumnName(column);
                Boolean checked = (Boolean) model.getValueAt(row, column);
                if (checked) {
                    System.out.println(columnName + ": " + true);
                } else {
                    System.out.println(columnName + ": " + false);
                }
            }
        }
    }

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

Answer 2

感谢 mKorbel 的评论，我为表模型重写了 setValueAt 方法，如下所示：

public void setValueAt(Object value, int row, int col) {
    super.setValueAt(value, row, col);
    if (col == 4) {
        if ((Boolean) this.getValueAt(row, col) == true) {
            //code goes here
        }
        else if ((Boolean) this.getValueAt(row, col) == false) {
            //code goes here
        }
    }   
}

现在，只有当单元格中的值实际发生变化时才会执行代码，这就是我想要的。