Fixed a top line in JScrollPane?

Question

Dear all,
I have a JScrollPane, which has a textPane in it. Now I want to set one important warning line at the top of the textPane, and then add any other texts into textPane following the warning line. Moreover, I want this warning line to be fixed at the top, no matter whether the textPane scroll down or not, i.e, this warning line is always at the top of pane and never disappears when scrolling down the textPane.
I do not know how to implement this. The following code will scroll away the warning line after I adds long lines to it.
Any samples on how to implement this?
public class NewsPane extends JScrollPane {
  private JTextPane text;
  private DefaultStyledDocument doc;
  public NewsPane() {
       JTextPane text = new JTextPane( doc=new DefaultStyledDocument());
       text.setText("Warning ...");
       setViewportView(text);
  }Thanks!

Answer 1

Try this
regards
Stas
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;
public class Test {
JTextPane edit=new JTextPane();
JScrollPane scroll;
JLabel l;
public Test() throws Exception {
JFrame frame=new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
scroll=new JScrollPane(edit);
l=new JLabel("Warning!");
l.setBounds(10,10,100,20);
l.setForeground(Color.red);
edit.add(l);
frame.getContentPane().add(scroll);
AdjustmentListener adjLst = new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent e) {
Rectangle rect=scroll.getViewport().getViewRect();
l.setLocation(rect.x+10,rect.y+10);
scroll.getVerticalScrollBar().addAdjustmentListener(adjLst);
frame.setSize(200,200);
frame.setLocationRelativeTo(null);
frame.show();
edit.getDocument().insertString(0,"test1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n",null);
public static void main(String[] args) throws Exception {
new Test();