Re: JScrollPane doesn't resize properly

RedGrittyBrick <>
Tue, 16 Jan 2007 18:58:25 +0000
Andrew Thompson wrote:

halex2000 wrote:

Thank you,

Your future lack of top-posting, will be thanks enough.

I can show you the frame class, but in order to reproduce the issue I should
send you also a data file (the content) which I'm not allowed to.

No. I do not now, nor *never* wanted, 'the content'.
The fact you would say that, indicates to me that
you did not read the document I linked to earlier.

Please read it - I think it might help you.
The link to the SSCCE again, is..

<> for tips.

Below is an example of an SSCCE. It has a JPanel in a JScrollPane in a
JFrame. clicking the panel randomly resizes it, causing scrollbars to
appear as needed.

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;

public class PanelScroller extends JPanel implements MouseListener {

     JPanel drawing;

     JLabel sizeLabel = new JLabel(" Click Me! ");

     Random r = new Random();

     PanelScroller() {
         drawing = new JPanel();
         setPanelSize(300, 200);

         JScrollPane scroller = new JScrollPane(drawing);

     void setPanelSize(int w, int h) {
         sizeLabel.setText(w + " x " + h);
         Dimension d = new Dimension(w, h);

     public static void main(String[] args) {
         SwingUtilities.invokeLater(new Runnable() {
             public void run() {
                 JFrame f = new JFrame("App Title");
                 f.add(new PanelScroller());

     public void mouseClicked(MouseEvent arg0) {
         int width = 250 + r.nextInt(100);
         int height = 150 + r.nextInt(75);
         setPanelSize(width, height);

     public void mousePressed(MouseEvent arg0) {}
     public void mouseReleased(MouseEvent arg0) {}
     public void mouseEntered(MouseEvent arg0) {}
     public void mouseExited(MouseEvent arg0) {}

Making it work sensibly when the JFrame is resized is left as an
exercise for the reader :-)

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