JTable Header Cell中的JPanel

Question

我正在尝试用JPanel替换JTable标题单元格（JLabel）。原因是有一个更灵活的容器来放置其他标题相关的东西，即多列排序指标。放置一个面板是直截了当的，但保持LAF似乎很麻烦。

我的尝试是覆盖标题渲染器并将内容打包到JPanel中。它可以工作，但默认的LAF已经按预期消失了。

import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;

public class JTableHeaderExperimental {

    static class XTableHeaderCellRenderer extends DefaultTableCellRenderer{
        private TableCellRenderer defaultRenderer;

        public XTableHeaderCellRenderer(TableCellRenderer defaultRenderer) {
            this.defaultRenderer = defaultRenderer;
        }

        @Override
        public Component getTableCellRendererComponent(JTable table,
                Object value, boolean isSelected, boolean hasFocus, int row,
                int column) {
            super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

            // For the simplicity, skipping sorting icon related stuff
            GridBagConstraints constraints = new GridBagConstraints();
            JPanel panel = new JPanel(new GridBagLayout());
            JLabel extraLabel = new JLabel("Extra label");
            JLabel originalLabel = (JLabel) defaultRenderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

            constraints.fill = GridBagConstraints.HORIZONTAL;
            constraints.gridx = 0;
            constraints.gridy = 0;
            panel.add(extraLabel, constraints);

            constraints.gridx = 0;
            constraints.gridy = 1;
            panel.add(this, constraints);

            System.out.println("Original Header Border: " + originalLabel.getBorder().getClass());
            System.out.println("New Header Border: " + this.getBorder().getClass());
            System.out.println("Header Panel Border: " + panel.getBorder().getClass());

            return panel;
        }
    }

    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | InstantiationException
                | IllegalAccessException | UnsupportedLookAndFeelException e) {
            e.printStackTrace();
        }

        Object[][] data = {
                {"Test", "Data"},
                {"Comes", "Here"}               
        };
        String[] columnNames = {"Header 1", "Header 2"};
        JFrame frame = new JFrame();
        JTable table = new JTable();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        table.setModel(model);
        table.getTableHeader().setDefaultRenderer(new XTableHeaderCellRenderer(table.getTableHeader().getDefaultRenderer()));
        frame.setSize(200, 200);

        frame.add(new JScrollPane(table));
        frame.setVisible(true);

    }
}

运行此代码会输出：

Original Header Border: class javax.swing.plaf.synth.SynthBorder
New Header Border: class javax.swing.border.EmptyBorder
Header Panel Border: class javax.swing.plaf.synth.SynthBorder

并呈现：

而不是默认系统LAF：

我想知道是否可以创建一个面板并传递原始标签的LAF细节（即边框，bg / fg颜色）。