java - 在单元格编辑器中调用操作后单元格不会更新

Question

我正在使用一个带有单元格渲染器的表格，它允许我在每个单元格中放置一个按钮“x”，其中包含一个值，这样我就可以通过按下按钮来删除单元格的值。单元格编辑器将 Action 监听器分配给按钮，并在按下按钮时调用适当的 Action 。

作为 DefaultTableModel 的表模型中的每一列都由值的数组列表填充。我成功地通过按下按钮从数组列表中删除了正确的值，并且表中的每个其他单元格在更改后刷新，但值被删除的单元格保持不变。如果我重新启动应用程序或向数组列表添加一个值，表格会按预期刷新，一切看起来都应该如此。

Mo 问题是，单元格渲染器似乎不会忘记单元格的初始值，因此即使重新绘制表格，它仍会继续将此值打印到单元格中。有谁知道我如何正确刷新表格以便正确显示值？

表类:

public class Table extends JTable {

public static DefaultTableModel model = new DefaultTableModel();
private Days d;
private JFrame frame;
private AddCellRenderer renderer;
private AddCellEditor editor;

public Table(Days d, JFrame frame) {
    // Assign the table model to the table
    super(model);
    this.d = d;
    this.frame = frame;

    // Define dimensions of table
    model.setRowCount(11);
    model.setColumnCount(5);

    // Block resizing and reordering of headers
    this.setColumnSelectionAllowed(false);
    this.setRowSelectionAllowed(false);
    this.setCellSelectionEnabled(true);
    this.setTableHeader(null);

    // Define first row height
    this.setRowHeight(38);
    // Define all other row's heights
    this.setRowHeight(0, 45);

    this.d.setTable(this);

    for (int i = 0; i < 5; i++) {
        editor = new AddCellEditor(new JCheckBox(), d.getVisibleDays().get(i), this);
        renderer = new AddCellRenderer(d.getVisibleDays().get(i), editor);
        this.getColumnModel().getColumn(i).setCellRenderer(renderer);
        this.getColumnModel().getColumn(i).setCellEditor(editor);
    }

    this.refresh();
}

public void refresh() {

    // Empty table
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 11; j++) {
            this.getModel().setValueAt(null, j, i);
        }
    }

    // Populate table with entries for each day
    for (int i = 0; i < 5; i++) {

        Iterator<String> iterator = d.getVisibleDays().get(i).getEntryListIterator();

        int j = 0;

        while(iterator.hasNext()){
            String s = iterator.next();
            this.getModel().setValueAt(s, (j+1), i);
            j++;
        }

        this.getModel().setValueAt(d.getVisibleDays().get(i).getDayName(), 0, i);
    }
}

public void modelClearValueAt(int row, int column) {
    this.getModel().setValueAt(null, row, column);
}
}

单元格编辑器类:

public class AddCellEditor extends DefaultCellEditor {

private JPanel headerPanel;
private JPanel entryPanel;
private JLabel dayName;
private JLabel entryValue;
protected JButton addButton;
private JButton removeButton;
private String label;
private int row;
private int column;
private Day day;
private String date;
private Table table;
private AddCellRenderer renderer;

public AddCellEditor(JCheckBox checkBox, Day day, Table table) {
    super(checkBox);
    this.day = day;
    this.table = table;
    date = day.getDayDate();
    headerPanel = new JPanel();
    headerPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
    entryPanel = new JPanel();
    entryPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
    dayName = new JLabel();
    entryValue = new JLabel();
    addButton = new JButton();
    removeButton = new JButton();
    headerPanel.add(dayName);
    headerPanel.add(addButton);
    entryPanel.add(entryValue);
    entryPanel.add(removeButton);
    addButton.setOpaque(true);
    addButton.setPreferredSize(new Dimension(16, 16));
    removeButton.setOpaque(true);
    removeButton.setPreferredSize(new Dimension(16, 16));
    addButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("Add pressed");
            addItem();
            fireEditingStopped();
        }
    });
    removeButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("Remove pressed");
            removeItem();
            getTable().refresh();
            fireEditingStopped();
        }
    });

}

public void setRenderer(AddCellRenderer renderer) {
    this.renderer = renderer;
}

public Component getTableCellEditorComponent(JTable table, 
        Object value, boolean isSelected, int row, int column) {

    this.row = row;
    this.column = column;

    if (row == 0) {
         return this.headerPanel;
    }
    if (row != 0 && value != null) {
        return this.entryPanel;
    }
    return null;
}

public void addItem() {
    String input = JOptionPane.showInputDialog("Add entry for " + label + ":");

    if ((input != null) && (input.length() > 0)) {
        System.out.println("Added: " + input + "Item");
        day.addEntry(input, column);
    }
}

public void removeItem() {
    table.modelClearValueAt(row, column);
    day.removeEntry(row-1);
    System.out.println("Item removed");
}

public Table getTable() {
    return this.table;
}

public boolean stopCellEditing() {
    return super.stopCellEditing();
}

protected void fireEditingStopped() {
    super.fireEditingStopped();
}
}

提前致谢

Answer 1

如果您使用的是 DefaultTableModel，则必须删除模型本身持有的值，而不是用于构建模型的 ArrayList 中的值。您可以通过调用 DefaultTableModel 对象的 setValueAt(...) 方法来完成此操作。

您可能希望发布 SSCCE以获得更具体的帮助。