Re: Wrap FlowLayout

Knute Johnson <>
Thu, 01 May 2008 09:52:12 -0700
Jason Cavett wrote:

On May 1, 12:20 pm, Knute Johnson <>

Jason Cavett wrote:

I'm using a FlowLayout in a JFrame. However, when a user resizes the
JFrame, the components (JCheckBoxes) do not wrap. Instead, they just
disappear completely. Is it possible to have FlowLayout wrap? If so,
what am I doing wrong?
Here is the setup of the JPanel (which is inside my JFrame).
FlowLayout flowLayout = new FlowLayout();
southPropertiesPanel = new JPanel();
southPropertiesPanel.add(getFirstPropertyCheckBox(), null);
southPropertiesPanel.add(getSecondPropertyCheckBox(), null);
southPropertiesPanel.add(getThirdPropertyCheckBox(), null);
southPropertiesPanel.add(getFourthPropertyCheckBox(), null);

You must have the size of the JPanel constrained somehow so that you
can't see the rest of the components. Just out of curiosity what is the
null constraint for in the add?

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

public class test {
     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 JFrame f = new JFrame();
                 JPanel p = new JPanel(new FlowLayout());

                 JButton b;
                 for (int i=0; i<10; i++) {
                     b = new JButton(Integer.toString(i));



Knute Johnson
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Actually, after a bit of testing, it may be because of the following

1. I have a JFrame with a BorderLayout.
2. Inside the JFrame, I have three panels. northPanel, centerPanel
and southPanel. The southPanel is the one that contains the
JCheckBoxes (and the FlowLayout).
3. When I resize the JFrame, it appears that the centerPanel receives
the benefit of the resize, but the south and north panels appear to
stay statically sized.

That's at least what I am seeing. Not sure if there is any way to
change/fix this.

BorderLayout for the JFrame will be problematic, the edge areas in BL do
not follow the same rules as the center. I would try GridBagLayout,
it's always more complicated but you can usually get it to do almost


Knute Johnson
email s/nospam/linux/

Posted via - Premium Uncensored Newsgroup Service

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