Overriding createToolTip?

Question

I am trying to override createToolTip in order to get a multi-line tooltip. It works fine for JButton but it does not work for my DefaultTableCellRenderer. Does anybody know why?
public class MyDefaultCellRenderer extends DefaultTableCellRenderer {
  public MyDefaultCellRenderer() {
    super();
  public JToolTip createToolTip() {
    return new MultiLineToolTip();
}Thanks

Answer 1

Matt,
Not sure if I've simulated what you're doing, but I've managed to get round your problem by getting the JTable to override createToolTip() rather than the renderer - the renderer simply sets its own tool tip text. Here's some test code you can try - it's not a multi-line tooltip but a bespoke tooltip nevertheless which changes the default colours:
import java.awt.*;
import javax.swing.*;
public class Test extends JFrame
public Test()
     super( "Tooltip Test" );
     setSize( 500, 500 );
     MyModel model = new MyModel();
     JTable jt = new JTable( model ) { public JToolTip createToolTip() { return new MyToolTip(); } };
     jt.setDefaultRenderer( String.class, new MyRenderer() );
     JScrollPane jsp = new JScrollPane( jt );
     JPanel p = new JPanel();
     p.add( jsp, BorderLayout.CENTER );
     JButton b = new JButton( "Press me" ) { public JToolTip createToolTip() { return new MyToolTip(); } };
     b.setToolTipText( "I'm a button" );
     p.add( b );
     getContentPane().add( p );
public static void main(String args[])
     Test t = new Test();
     t.setVisible(true);
import javax.swing.*;
public class MyToolTip extends JToolTip
public MyToolTip()
     setForeground(java.awt.Color.red);
     setBackground(java.awt.Color.yellow);
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
public class MyRenderer extends JLabel implements TableCellRenderer
public MyRenderer()
     super();
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,      boolean hasFocus, int row,int column)
     if (value != null) { setText( ( String ) value ); }
     setToolTipText( "I'm a renderer" );
     return this;
import javax.swing.table.*;
public class MyModel extends AbstractTableModel
  Class columnClasses[] = {String.class, String.class};
  Object  data[][] = {
     {"Who", "needs"},
     {"tooltips", "anyway"}
  public Class getColumnClass(int c)
      return columnClasses[c];
  public int getColumnCount() { return data[0].length; }   
  public int getRowCount() { return data.length; }   
  public Object getValueAt(int r, int c) { return data[r][c]; }   
public void setValueAt(Object value, int r, int c) { data[r][c] = value; }   
}