JSCROLLABLETOOLTIP

/*
 * JScrollableToolTip.java
 */
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class JScrollableToolTip extends JToolTip implements MouseWheelListener {
 
    private JTextArea tipArea;
    private JScrollPane scrollpane;
    private JComponent comp;
 
    /** Creates a tool tip. */
    public JScrollableToolTip(final int width, final int height) {
        this(width, height, null);
    }
 
    public JScrollableToolTip(final int width, final int height, final JComponent comp) {
        this.comp = comp;
        setPreferredSize(new Dimension(width, height));
        setLayout(new BorderLayout());
        tipArea = new JTextArea();
        tipArea.setLineWrap(true);
        tipArea.setWrapStyleWord(true);
        tipArea.setEditable(false);
        tipArea.setBackground(new Color(255, 255, 204));
        scrollpane = new JScrollPane(tipArea);
        add(scrollpane);
        if(comp != null){
            comp.addMouseWheelListener(this);
        }
    }
 
    public void mouseWheelMoved(final MouseWheelEvent e) {
        scrollpane.dispatchEvent(e);
        MouseEvent e2 = new MouseEvent(comp, MouseEvent.MOUSE_MOVED, 0, 0, 0, 0, 0, false);
        comp.dispatchEvent(e2);
    }
 
    @Override
    public void setTipText(final String tipText) {
        String oldValue = this.tipArea.getText();
        tipArea.setText(tipText);
        tipArea.setCaretPosition(0);
        firePropertyChange("tiptext", oldValue, tipText);
    }
 
    @Override
    public String getTipText() {
        return tipArea == null ? "" : tipArea.getText();
    }
 
    @Override
    protected String paramString() {
        String tipTextString = (tipArea.getText() != null ? tipArea.getText() : "");
 
        return super.paramString() +
                ",tipText=" + tipTextString;
    }
 
    //for testing only:
    public static void main(final String args[]) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(300, 100);
        f.setLocationRelativeTo(null);
        ToolTipManager.sharedInstance().setDismissDelay(30000);
        JButton button = new JButton("Used to display...") {
 
            @Override
            public JToolTip createToolTip() {
                JScrollableToolTip tip = new JScrollableToolTip(200, 80, this);
                tip.setComponent(this);
                return tip;
            }
        };
        button.setToolTipText("Used to display a 'Tip' for a Component. " +
                "Typically components provide api to automate the process of " +
                "using ToolTips. For example, any Swing component can use the " +
                "JComponent  setToolTipText method to specify the text for a standard tooltip.");
        f.add(button);
        f.setVisible(true);
    }
}