Code
class VerticalTableHeaderRenderer implements TableCellRenderer {
private static final String ASCENDING = "Table.ascendingSortIcon";
private static final String DESCENDING = "Table.descendingSortIcon";
private final Icon ascendingIcon;
private final Icon descendingIcon;
private final EmptyIcon emptyIcon = new EmptyIcon();
private final JPanel intermediate = new JPanel();
private final JLabel label = new JLabel("", null, SwingConstants.LEADING);
protected VerticalTableHeaderRenderer() {
ascendingIcon = UIManager.getLookAndFeelDefaults().getIcon(ASCENDING);
descendingIcon = UIManager.getLookAndFeelDefaults().getIcon(DESCENDING);
emptyIcon.width = ascendingIcon.getIconWidth();
emptyIcon.height = ascendingIcon.getIconHeight();
}
@Override public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
UIManager.put(ASCENDING, emptyIcon);
UIManager.put(DESCENDING, emptyIcon);
TableCellRenderer r = table.getTableHeader().getDefaultRenderer();
Component c = r.getTableCellRendererComponent(
table, value, isSelected, hasFocus, row, column);
UIManager.put(ASCENDING, ascendingIcon);
UIManager.put(DESCENDING, descendingIcon);
if (c instanceof JLabel) {
JLabel l = (JLabel) c;
l.setHorizontalAlignment(SwingConstants.CENTER);
SortOrder sortOrder = getColumnSortOrder(table, column);
Icon sortIcon;
switch (sortOrder) {
case ASCENDING:
sortIcon = ascendingIcon;
break;
case DESCENDING:
sortIcon = descendingIcon;
break;
default: // case UNSORTED:
sortIcon = emptyIcon;
break;
}
label.setText(l.getText());
label.setIcon(new RotateIcon(sortIcon, 90));
label.setHorizontalTextPosition(SwingConstants.LEFT);
label.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 2));
// l.setIcon(new RotateIcon(new ComponentIcon(label), -90));
l.setIcon(makeVerticalHeaderIcon(label));
l.setText(null);
}
return c;
}
public static SortOrder getColumnSortOrder(JTable table, int column) {
SortOrder rv = SortOrder.UNSORTED;
if (table != null && table.getRowSorter() != null) {
List<? extends RowSorter.SortKey> sortKeys =
table.getRowSorter().getSortKeys();
int mi = table.convertColumnIndexToModel(column);
if (!sortKeys.isEmpty() && sortKeys.get(0).getColumn() == mi) {
rv = sortKeys.get(0).getSortOrder();
}
}
return rv;
}
private Icon makeVerticalHeaderIcon(Component label) {
Dimension d = label.getPreferredSize();
int w = d.height;
int h = d.width;
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = (Graphics2D) bi.getGraphics();
AffineTransform at = AffineTransform.getTranslateInstance(0, h);
at.quadrantRotate(-1);
g2.setTransform(at);
SwingUtilities.paintComponent(g2, label, intermediate, 0, 0, h, w);
g2.dispose();
return new ImageIcon(bi);
}
}
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