Re: Custom JScrollPane - Double JScrollBars

pek <>
Fri, 25 Apr 2008 22:51:44 -0700 (PDT)
On Apr 24, 4:30 pm, "David A. Redick" <>

You'll have to override the layout manager.

In the example below, I made the scroll pane display 2 vertical bars.
All I did was resize/reposition the viewport, the vertical and the
horizontal bar.

The outer most vertical bar will still act like that standard horiz
The inner vertical bar will be the same normal vertical bar.

Are you sure you really need to do this?
I agree with RGB that you sure have a look at the other default panes
just make sure. =/


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class MySPLayout extends ScrollPaneLayout
        public void layoutContainer(Container parent)

                Rectangle hRec = hsb.getBounds();
                Rectangle vRec = vsb.getBounds();
                Dimension size = viewport.getExtentSize();

                // adjust viewport size, add to the bottom, sub from right side
                size.width -= vRec.width;
                size.height += hRec.height;

                // get rid of the corner
                vRec.height += hRec.height;

                // scoot over to make room
                vsb.setLocation(vRec.x - vRec.width, vRec.y);
                vsb.setSize(vRec.width, vRec.height);

                hsb.setLocation(vRec.x, vRec.y);
                hsb.setSize(vRec.width, vRec.height);


public class GUI extends JFrame /* implements ActionListener */

        // GUI objects
        JTextArea m_pText;
        JScrollPane m_pScrollPane;

                super("Test GUI");

                m_pText = new JTextArea("This is a test.");
                m_pText.setFont(new Font(Font.MONOSPACED, Font.PLAIN, 12));

                m_pScrollPane = new JScrollPane(m_pText);



                m_pScrollPane.setLayout(new MySPLayout());



        public void dispose()


First of all thank you for your replies. To be fair, I'll explain a
little more. I want to create a panel that, when needed, will display
vertical and horizontal bars. When either a horizontal or a vertical
scroll bar appears, I want them to be double (2 horizontal scroll bars
or 2 vertical scroll bars). Both will point at the same view, but each
will behave different (probably one of them will scroll faster or
scroll the other way or anything). I want to explicitly define how
each will behave.

I'll try your code and report back. Thank you once again.

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