从 JTable 中的排序中排除列

发布于 2024-10-15 15:56:13 字数 236 浏览 1 评论 0原文

我有一个简单的 Swing JTable 和一个我制作的 TableRowSorter。但是，我会从排序中排除第一列，因为我想保留它来显示行号。我看不到任何东西，除了

sorter.setSortable(0, false);

这使得该列不可单击，但在单击另一列时仍然可以排序...... 那么简单的问题是：如何防止 TableRowSorter 对列进行排序？

谢谢你！

原文

I have a simple Swing JTable and a TableRowSorter made by me. However, I would exclude the first column from the sorting, as I want to keep it to show row numbers.
I can't see to find anything, except

sorter.setSortable(0, false);

Which makes the column not clickable, but still sortable when another column is clicked...
So quick question will be: how to keep a column from being sorter by a TableRowSorter?

Thank you!

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如此安好 2024-10-22 15:56:13

因此，使用 JTable（如下所示）对 A 列进行排序将产生以下结果。但是，您希望对数据进行排序，而不是对行号进行排序，对吗？

|row| column A  |       |row| column A  |
+---+-----------+       +---+-----------+
| 1 | blah blah |  -->  | 1 | blah blah |
| 2 | something |       | 3 | more blah |
| 3 | more blah |       | 2 | something |

我会用 TableCellRenderer 来解决这个问题对于第 0 列。技巧是忽略传递的值，而使用行参数。

public class RowRenderer extends JLabel implements TableCellRenderer {
    public Component getTableCellRendererComponent(JTable table, Object color,
        boolean isSelected, boolean hasFocus, int row, int column) {
        setText(Integer.toString(row));
        return this;
    }
}

注意：如果您要对表格进行分页（即模型不包含所有行；例如仅第 100-200 行），您需要向单元格渲染器告知要添加到 < code>row 获取要显示的行号。

So, with a JTable (ex below) sorting on column A would produce the following. However, you want the data to sort, but not the row numbers, correct?

|row| column A  |       |row| column A  |
+---+-----------+       +---+-----------+
| 1 | blah blah |  -->  | 1 | blah blah |
| 2 | something |       | 3 | more blah |
| 3 | more blah |       | 2 | something |

I would approach this with a TableCellRenderer for column 0. The trick is to ignore the value passed and instead use the row parameter.

public class RowRenderer extends JLabel implements TableCellRenderer {
    public Component getTableCellRendererComponent(JTable table, Object color,
        boolean isSelected, boolean hasFocus, int row, int column) {
        setText(Integer.toString(row));
        return this;
    }
}

Note: if you are paginating your table (ie the model does not contain all of the rows; for example only rows 100-200) you will need to advise the cell renderer of the amount to add to row to obtain the row number to display.

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小镇女孩 2024-10-22 15:56:13

JTable 是围绕显示数据行而不是数据单元格而设计的，因此正如您所说，实际上不可能阻止单个列进行排序。相反，我会尝试修改您的 TableModel 以返回该列的值的行索引：

@Override public Object getValueAt(int rowIndex, int columnIndex) {
    if (columnIndex == 0) return rowIndex;
    else {
        // handle other columns
    }
}

如果这不起作用，您也可以尝试修改表格单元格渲染器以使用表格行索引。

A JTable is designed around displaying rows of data, not cells of data, so it isn't really possible to prevent an individual column from sorting, as you put it. Instead I would try modifying your TableModel to return the row index for the value for that column:

@Override public Object getValueAt(int rowIndex, int columnIndex) {
    if (columnIndex == 0) return rowIndex;
    else {
        // handle other columns
    }
}

If that doesn't work you could also try modifying the table cell renderer to use the table row index instead.

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