Java JTable标题自动换行 [英] Java JTable header word wrap
问题描述
我试图让表格上的标题包含自动换行。我已设法做到这一点，但第一个数据行正在扩展。该表的代码是：
I am trying to get the header on a table to have word wrap. I have managed to do this but the first data row is expanding. The code for the table is:
public class GenerateTable extends JTable {
private JCheckBox boxSelect = new JCheckBox();
private JTableHeader hdGen;
public class LineWrapCellRenderer extends JTextArea implements TableCellRenderer {
private static final long serialVersionUID = 1L;
int rowHeight = 0; // current max row height for this scan
@Override
public Component getTableCellRendererComponent(
JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column)
{
/*
* row < 0 means header
*/
if(row >= 0) {
setWrapStyleWord(false);
return this;
}
setText((String) value);
setWrapStyleWord(true);
setLineWrap(true);
// current table column width in pixels
int colWidth = table.getColumnModel().getColumn(column).getWidth();
// set the text area width (height doesn't matter here)
setSize(new Dimension(colWidth, 1));
// get the text area preferred height and add the row margin
int height = getPreferredSize().height + table.getRowMargin();
// ensure the row height fits the cell with most lines, row = -1 for header
if (column == 2 || height > rowHeight) {
table.setRowHeight(row, height);
rowHeight = height;
}
return this;
}
}
LineWrapCellRenderer lwHeader = new LineWrapCellRenderer();
public GenerateTable(GenerateTableModel model) {
super(model);
this.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
/*
* Select
*/
TableColumn colSelect = this.getColumnModel().getColumn(0);
colSelect.setCellEditor(new DefaultCellEditor(boxSelect));
colSelect.setPreferredWidth(60);
/*
* category
*/
this.getColumnModel().getColumn(1).setResizable(false);
this.getColumnModel().getColumn(1).setPreferredWidth(200);
/*
* Amount values
*/
for (int i=2;i<model.getColumnCount();i++) {
colSelect = this.getColumnModel().getColumn(i);
colSelect.setPreferredWidth(100);
colSelect.setResizable(false);
colSelect.setHeaderRenderer(lwHeader);
}
}
}
输出为：
我在调试中遵循了代码，而没有为数据行调用LineWrapCellRenderer。如果我取出代码，我得到一个普通的表，但没有包装在标题上。这是一个公认的问题还是我错过了什么？
I have followed the code through in debug and LineWrapCellRenderer is not being called for the data lines. If I take the code out I get a normal table but no wrap on the header. Is this a recognised problem or am I missing something?
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推荐答案
您可以更轻松地实现多行标题。
You can achieve multi-line headers much easier.
与许多Swing组件一样，您可以使用HTML代码。在HTML中指定< br> 元素，以指示换行/换行的位置。
As with many Swing components you can use HTML code. In HTML specify <br> elements to indicate where line breaks / new lines should occur.
例如，如果您使用以下标题值（列名称）：
For example if you use the following header values (column names):
String[] columnNames = {
"<html>First<br>column</html>",
"<html>Second<br>column</html>",
"<html>Third<br>column</html>"
};
然后标题将正确呈现为2行。您甚至不需要创建/使用自定义标题渲染器，默认标题渲染器可以正确处理HTML代码。
Then the headers will be properly rendered in 2 lines. You don't even need to create/use a custom header renderer, the default header renderer properly handles HTML code.
注意：标题高度将由第一列的高度决定。因此，您必须为第一列使用2行HTML值。如果第一列只有一个单词，您可以另外添加一个空的第二行，如下所示：< html>选择< br>& nbsp;< / html>
Note: The header height will be determined by the height of the first column. So you have to use a 2-line HTML value for the first column too. If you only have 1 word for the first column, you may additionally add an empty second line like this: "<html>Select<br> </html>"
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