import java.awt.Component;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.Enumeration;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
/**
* @version 1.0 11/09/98
*/
public class MultiLineHeaderExample extends JFrame {
MultiLineHeaderExample() {
super("Multi-Line Header Example");
DefaultTableModel dm = new DefaultTableModel();
dm.setDataVector(
new Object[][] { { "a", "b", "c" }, { "A", "B", "C" } },
new Object[] { "1st\nalpha", "2nd\nbeta", "3rd\ngamma" });
JTable table = new JTable(dm);
MultiLineHeaderRenderer renderer = new MultiLineHeaderRenderer();
Enumeration<TableColumn> columns = table.getColumnModel().getColumns();
while (columns.hasMoreElements()) {
((TableColumn) columns.nextElement()).setHeaderRenderer(renderer);
}
JScrollPane scroll = new JScrollPane(table);
getContentPane().add(scroll);
setSize(400, 110);
setVisible(true);
}
public static void main(String[] args) {
MultiLineHeaderExample frame = new MultiLineHeaderExample();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
/**
* @version 1.0 11/09/98
*/
class MultiLineHeaderRenderer extends JList implements TableCellRenderer {
public MultiLineHeaderRenderer() {
setOpaque(true);
setForeground(UIManager.getColor("TableHeader.foreground"));
setBackground(UIManager.getColor("TableHeader.background"));
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
ListCellRenderer renderer = getCellRenderer();
((JLabel) renderer).setHorizontalAlignment(JLabel.CENTER);
setCellRenderer(renderer);
}
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
setFont(table.getFont());
String str = (value == null) ? "" : value.toString();
BufferedReader br = new BufferedReader(new StringReader(str));
String line;
Vector v = new Vector();
try {
while ((line = br.readLine()) != null) {
v.addElement(line);
}
} catch (IOException ex) {
ex.printStackTrace();
}
setListData(v);
return this;
}
}
