Re: Wrap FlowLayout
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 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();
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.EXIT_ON_CLOSE);
JPanel p = new JPanel(new FlowLayout());
JButton b;
for (int i=0; i<10; i++) {
b = new JButton(Integer.toString(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.
Jason:
Here's a simple example with three components, the bottom one containing
8 JButtons in a FlowLayout. Each of the three components have the same
weights so they should take approximately the same space. The buttons
will reorganize as the JFrame is resized. You can do a lot here with
setting some preferred/minimum sizes.
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.EXIT_ON_CLOSE);
f.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.BOTH;
c.weightx = c.weighty = 1.0;
c.gridy = 0;
JPanel north = new JPanel();
north.setBackground(Color.RED);
f.add(north,c);
c.gridy = 1;
JPanel center = new JPanel();
center.setBackground(Color.BLUE);
f.add(center,c);
c.gridy = 2;
JPanel p = new JPanel(new FlowLayout());
JButton b;
for (int i=0; i<10; i++) {
b = new JButton(Integer.toString(i));
p.add(b);
}
f.add(p,c);
f.pack();
f.setVisible(true);
}
});
}
}
--
Knute Johnson
email s/nospam/linux/
--
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