Code
class RoundedHeaderRenderer extends DefaultTableCellRenderer {
private final JLabel firstLabel = new JLabel() {
@Override public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(getBackground());
float r = 8f;
float x = 0f;
float y = 0f;
float w = getWidth();
float h = getHeight();
Path2D p = new Path2D.Float();
p.moveTo(x, y + r);
p.quadTo(x, y, x + r, y);
p.lineTo(x + w, y);
p.lineTo(x + w, y + h);
p.lineTo(x + r, y + h);
p.quadTo(x, y + h, x, y + h - r);
p.closePath();
g2.fill(p);
g2.dispose();
super.paintComponent(g);
}
};
private final JLabel lastLabel = new JLabel() {
@Override public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(getBackground());
float r = 8f;
float x = 0f;
float y = 0f;
float w = getWidth();
float h = getHeight();
Path2D p = new Path2D.Float();
p.moveTo(x, y);
p.lineTo(x + w - r, y);
p.quadTo(x + w, y, x + w, y + r);
p.lineTo(x + w, y + h - r);
p.quadTo(x + w, y + h, x + w - r, y + h);
p.lineTo(x, y + h);
p.closePath();
g2.fill(p);
g2.dispose();
super.paintComponent(g);
}
};
public RoundedHeaderRenderer() {
super();
firstLabel.setOpaque(false);
lastLabel.setOpaque(false);
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
firstLabel.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 5));
lastLabel.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 5));
}
@Override public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
JLabel l = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (column == 0) {
l = firstLabel;
} else if (column == table.getColumnCount() - 1) {
l = lastLabel;
}
l.setFont(table.getFont());
l.setText(value.toString());
l.setForeground(table.getTableHeader().getForeground());
l.setBackground(table.getTableHeader().getBackground());
l.setHorizontalAlignment(SwingConstants.CENTER);
return l;
}
}
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