Re: Wrap FlowLayout

From:

Jason Cavett <jason.cavett@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 2 May 2008 06:48:59 -0700 (PDT)

Message-ID:

<d29ba6f5-21e5-4878-a1b4-84d23fe15e63@2g2000hsn.googlegroups.com>

On May 1, 12:52 pm, Knute Johnson <nos...@rabbitbrush.frazmtn.com>
wrote:

Jason Cavett wrote:

On May 1, 12:20 pm, Knute Johnson <nos...@rabbitbrush.frazmtn.com>
wrote:

Jason Cavett wrote:

I'm using a FlowLayout in a JFrame. However, when a user resizes th=

JFrame, the components (JCheckBoxes) do not wrap. Instead, they jus=

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();
flowLayout.setAlignment(java.awt.FlowLayout.LEFT);
southPropertiesPanel = new JPanel();
southPropertiesPanel.setLayout(flowLayout);
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();
                 f.setDefaultCloseOperation(JFrame.EX=

IT_ON_CLOSE);

JPanel p = new JPanel(new FlowLayo=

ut());

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

String(i));

                     p.add(b);
                 }
                 f.add(p,BorderLayout.CENTER);
                 f.pack();
                 f.setVisible(true);
             }
         });
     }

}

--

Knute Johnson
email s/nospam/linux/

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Actually, after a bit of testing, it may be because of the following
reason:

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
anything.

--

Knute Johnson
email s/nospam/linux/

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Alright. At least I don't feel like I'm going crazy anymore. Thanks
for the response and thank for the code example below.