The basic issue I had was there was no connection between the table header and the selection change. In fact, the header is really clever with it's repaints...
I ended up providing my own header, which attached a listener to the table's selection model and repainted the header on the selection changed.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.util.List;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.RowSorter;
import javax.swing.RowSorter.SortKey;
import static javax.swing.SortOrder.ASCENDING;
import static javax.swing.SortOrder.DESCENDING;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
public class TestColumnHighlight {
public static void main(String[] args) {
new TestColumnHighlight();
}
public TestColumnHighlight() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JTable table = new JTable();
DefaultTableModel model = new DefaultTableModel(
new Object[]{"abc", "def", "ghi", "jkl"},
0);
model.addRow(new Object[]{0, 0, 0, 0});
model.addRow(new Object[]{0, 0, 0, 0});
model.addRow(new Object[]{0, 0, 0, 0});
model.addRow(new Object[]{0, 0, 0, 0});
model.addRow(new Object[]{0, 0, 0, 0});
table.setModel(model);
table.setTableHeader(new CustomTableHeader(table));
table.getTableHeader().setDefaultRenderer(new ColumnHeaderRenderer());
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class CustomTableHeader extends JTableHeader {
public CustomTableHeader(JTable table) {
super();
setColumnModel(table.getColumnModel());
table.getColumnModel().getSelectionModel().addListSelectionListener(new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent e) {
repaint();
}
});
}
@Override
public void columnSelectionChanged(ListSelectionEvent e) {
repaint();
}
}
public class ColumnHeaderRenderer extends DefaultTableHeaderCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean selected, boolean focused, int row, int column) {
super.getTableCellRendererComponent(table, value, selected, focused, row, column);
int selectedColumn = table.getSelectedColumn();
System.out.println("Selected " + selectedColumn + "-" + column);
if (selectedColumn == column) {
Color bg = table.getSelectionBackground();
setBackground(bg);
setOpaque(true);
} else {
setOpaque(false);
}
return this;
}
}
public class DefaultTableHeaderCellRenderer extends DefaultTableCellRenderer {
public DefaultTableHeaderCellRenderer() {
setHorizontalAlignment(CENTER);
setHorizontalTextPosition(LEFT);
setVerticalAlignment(BOTTOM);
setOpaque(false);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
super.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
JTableHeader tableHeader = table.getTableHeader();
if (tableHeader != null) {
setForeground(tableHeader.getForeground());
}
setIcon(getIcon(table, column));
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return this;
}
protected Icon getIcon(JTable table, int column) {
SortKey sortKey = getSortKey(table, column);
if (sortKey != null && table.convertColumnIndexToView(sortKey.getColumn()) == column) {
switch (sortKey.getSortOrder()) {
case ASCENDING:
return UIManager.getIcon("Table.ascendingSortIcon");
case DESCENDING:
return UIManager.getIcon("Table.descendingSortIcon");
}
}
return null;
}
protected SortKey getSortKey(JTable table, int column) {
RowSorter rowSorter = table.getRowSorter();
if (rowSorter == null) {
return null;
}
List sortedColumns = rowSorter.getSortKeys();
if (sortedColumns.size() > 0) {
return (SortKey) sortedColumns.get(0);
}
return null;
}
}
}