TableHeaderRenderer with Nimbus

Question

I'm have a custom table header renderer that will have the standard label and a button inside a JComponent.

The issue I'm having is with the label returned by the default renderer. The call to the default renderer provides the standard label. If I return that as is, it looks as expected. If I try to modify the background or border nothing changes. Modifying the foreground does have the intended effect, however. I do not want to view the sort icons, so I'm attempting to construct a JLabel that looks the same, minus the icons. That is not working correctly either. My JLabel is opaque.

JLabel l = (JLabel)table.getTableHeader().getDefaultRenderer().getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
this.lbl.setBackground(l.getBackground());
return this.lbl;

I looked at the source for DefaultTableHeaderRenderer and I can't find anything special that the default class is doing.

I've also tried the following with no effect.

this.lbl.setOpaque(true);
this.lbl.setFont(UIManager.getFont("TableHeader.font"));
this.lbl.setBorder(UIManager.getBorder("TableHeader.cellBorder"));
this.lbl.setBackground(UIManager.getColor("TableHeader.background"));
this.lbl.setForeground(UIManager.getColor("TableHeader.foreground"));
return this.lbl;

EDIT: Clarification. Both code snippets above are inside getTableCellRenderComponent() of my custom renderer. I've tried both ways and neither has worked.

Answer 1

Try using the UIManagers values directly.

TableHeader.background = DerivedColor(color=214,217,223 parent=control offsets=0.0,0.0,0.0,0 pColor=214,217,223
TableHeader.font = javax.swing.plaf.FontUIResource[family=SansSerif,name=sansserif,style=plain,size=12]
TableHeader.foreground = DerivedColor(color=0,0,0 parent=text offsets=0.0,0.0,0.0,0 pColor=0,0,0
TableHeader.opaque = true

Something like UIManager.getColor("TableHeader.background") for example

The border I think you'll find is actually painted by the UI delegate directly.

Updated with example

From the included image, it's obvious that using UIManager does provide some of the basic information need to get the values used by the header, but it does highlight that the renderer is doing some special painting to get the shading.

The second column is the default renderer and the third is cheeky. It is basically stealing the cell renderer directly from the table header...

package testcellrenderer;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Font;
import javax.swing.JFrame;
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;

public class TestCellRenderer {

    public static void main(String[] args) {
        new TestCellRenderer();
    }

    public TestCellRenderer() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            DefaultTableModel model = new DefaultTableModel(
                            new Object[][]{{"Testing", "Testing", "Testing"}},
                            new Object[]{"Test A", "Test B", "Test C"}
                            );
            JTable table = new JTable(model);
            table.getColumn("Test A").setCellRenderer(new TestTableCellRenderer());
            table.getColumn("Test C").setCellRenderer(table.getTableHeader().getDefaultRenderer());

            setLayout(new BorderLayout());
            add(new JScrollPane(table));
        }

    }

    protected class TestTableCellRenderer extends DefaultTableCellRenderer {

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

            Color background = UIManager.getColor("TableHeader.background");
            Color foreground = UIManager.getColor("TableHeader.foreground");
            Font font = UIManager.getFont("TableHeader.font");
            boolean opaque = UIManager.getBoolean("TableHeader.opaque");

            setBackground(background);
            setForeground(foreground);
            setFont(font);
            setOpaque(opaque);

            return this;
        }       
    }   
}