在 JTable 标题上设置自定义渲染器时,我得到了预期的视觉行为(边框、字体、对齐方式……),但我无法获得通常在对行进行排序时出现的 LaF 排序图标。
这是设置自定义标题渲染器的代码:
Enumeration<TableColumn> columns = getColumnModel().getColumns();
while (columns.hasMoreElements())
columns.nextElement().setHeaderRenderer(new XDeliveryTableHeaderRenderer());
这是自定义 header 渲染器的摘录:
public class MyTableHeaderRenderer extends JLabel implements TableCellRenderer {
private static final Font labelFont = new Font("Arial", Font.BOLD, 11);
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
setFont(labelFont);
setHorizontalAlignment(SwingConstants.CENTER);
setText(value.toString());
setBorder(BorderFactory.createEtchedBorder());
return this;
}
}
有什么提示吗?
最佳答案
尝试委托(delegate) L&F 安装的渲染器:
public class MyTableHeaderRenderer implements TableCellRenderer {
private static final Font labelFont = new Font("Arial", Font.BOLD, 11);
private TableCellRenderer delegate;
public MyTableHeaderRenderer(TableCellRenderer delegate) {
this.delegate = delegate;
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Component c = delegate.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if(c instanceof JLabel) {
JLabel label = (JLabel) c;
label.setFont(labelFont);
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setBorder(BorderFactory.createEtchedBorder());
}
return c;
}
}
// Usage:
JTableHeader header = table.getTableHeader();
header.setDefaultRenderer(new MyTableHeaderRenderer(header.getDefaultRenderer()));
正如 kleopatra 警告的那样,这可能不是最稳定的解决方案,请参阅 this bug report我刚刚投入生产。该问题的报告者建议使用自定义 Table/TableColumn 子类来更新 TableColumn#getDefaultRenderer 中的委托(delegate)渲染器。
关于swing - JTable、自定义标题渲染器和排序图标,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7792586/