My own BoxLayout woes

P

public boolean

In the below code, I have an instruction label and below it an input
area with a label and a JTextField. I want whichever is smaller to be
centered above or below the other.

The problem is that the Box.createHorizontalGlue() method call no longer
appears to work. This is very strange, since I haven't changed,
reinstalled, updated, or anything my JDK and it used to work.

But it does not, now, expand into the space to the left and right of the
surrounded items and cause them to be centered the way it did in all of
my previous projects involving Swing.

I also tried adding them to the workPanel at EAST and WEST without results.

Why won't the smaller item center itself? What has changed since previously?


JPanel instructions = new JPanel();
instructions.setLayout(new BoxLayout(instructions,
BoxLayout.LINE_AXIS));
JPanel insbox = new JPanel();
insbox.setLayout(new BoxLayout(insbox, BoxLayout.PAGE_AXIS));
JLabel label = new JLabel("<html><body><div align=\"center\">" +
"Lorem ipsum dolor sit amet, consectetuer<br/>adipiscing" +
" elit. Nullam mauris nunc, auctor sit amet,<br/>" +
"tincidunt nec, ultricies vitae, nulla. Donec<br/>" +
"pulvinar nulla vel nibh.<br/><br/>Aliquam imperdiet " +
" nunc quis arcu.<br/>Praesent leo. Nam dictum.</div>" +
"</body></html>");
insbox.add(label);
insbox.add(Box.createRigidArea(new Dimension(0,10)));
instructions.add(Box.createHorizontalGlue()); // Has no effect.
instructions.add(insbox);
instructions.add(Box.createHorizontalGlue()); // Has no effect.
workPanel.setLayout(new BorderLayout());
workPanel.add(instructions, BorderLayout.CENTER);
extLabelWP = new JLabel("Enter the foobar bazquux here:");
mtFieldWP = new JTextField();
JPanel fieldPanel = new JPanel();
workPanel.add(fieldPanel, BorderLayout.SOUTH);
fieldPanel.setLayout(new BoxLayout(fieldPanel,
BoxLayout.LINE_AXIS));
fieldPanel.add(Box.createHorizontalGlue()); // Has no effect.
fieldPanel.add(extLabelWP);
fieldPanel.add(Box.createRigidArea(DATA_HGAP_SPANNER));
fieldPanel.add(mtFieldWP);
fieldPanel.add(Box.createHorizontalGlue()); // Has no effect.
extLabelWP.setDisplayedMnemonic(KeyEvent.VK_E);
extLabelWP.setLabelFor(mtFieldWP);
 
P

public boolean

public said:
In the below code, I have an instruction label and below it an input
area with a label and a JTextField. I want whichever is smaller to be
centered above or below the other.
Click to expand...

OT but technical question: Is it possible for a newsgroup post to appear
for the guy who posted it but not for anyone else? Because I think that
may have happened to me.
 
H

Harold \Curly\ Phillips

public boolean said:
In the below code, I have an instruction label and below it an input area
with a label and a JTextField. I want whichever is smaller to be centered
above or below the other.

The problem is that the Box.createHorizontalGlue() method call no longer
appears to work.
Click to expand...

You've made an incorrect assumption. The method call succeeds in creating
horizontal glue - the method call "works". The problem in your program lies
elsewhere.
This is very strange, since I haven't changed, reinstalled, updated, or
anything my JDK and it used to work.

But it does not, now, expand into the space to the left and right of the
surrounded items and cause them to be centered the way it did in all of my
previous projects involving Swing.

I also tried adding them to the workPanel at EAST and WEST without
results.
Click to expand...

You have failed to understand BorderLayout. It has special rules for how
available space is allocated to its central area.
Why won't the smaller item center itself? What has changed since
previously?
Click to expand...

It does center itself. There's a difference between the size and postion of
the label and of it's text. The text is left aligned within the label's
canvas. Just because the html contains a "center" doesn't mean the text as a
whole is centered on the label. The label is centered within the central
area of the BorderLayout but it is also taking up all available space in the
center of the BorderLayout.
JPanel instructions = new JPanel();
instructions.setLayout(new BoxLayout(instructions,
BoxLayout.LINE_AXIS));
JPanel insbox = new JPanel();
insbox.setLayout(new BoxLayout(insbox, BoxLayout.PAGE_AXIS));
JLabel label = new JLabel("<html><body><div align=\"center\">" +
"Lorem ipsum dolor sit amet, consectetuer<br/>adipiscing" +
" elit. Nullam mauris nunc, auctor sit amet,<br/>" +
"tincidunt nec, ultricies vitae, nulla. Donec<br/>" +
"pulvinar nulla vel nibh.<br/><br/>Aliquam imperdiet " +
" nunc quis arcu.<br/>Praesent leo. Nam dictum.</div>" +
"</body></html>");
Click to expand...

label.setBorder(new LineBorder(Color.BLUE)); // HP
label.setMaximumSize(label.getPreferredSize()); // HP
insbox.add(label);
insbox.add(Box.createRigidArea(new Dimension(0,10)));
instructions.add(Box.createHorizontalGlue()); // Has no effect.
instructions.add(insbox);
instructions.add(Box.createHorizontalGlue()); // Has no effect.
workPanel.setLayout(new BorderLayout());
workPanel.add(instructions, BorderLayout.CENTER);
extLabelWP = new JLabel("Enter the foobar bazquux here:");
mtFieldWP = new JTextField();
JPanel fieldPanel = new JPanel();
workPanel.add(fieldPanel, BorderLayout.SOUTH);
fieldPanel.setLayout(new BoxLayout(fieldPanel,
BoxLayout.LINE_AXIS));
fieldPanel.add(Box.createHorizontalGlue()); // Has no effect.
fieldPanel.add(extLabelWP);
fieldPanel.add(Box.createRigidArea(DATA_HGAP_SPANNER));
fieldPanel.add(mtFieldWP);
fieldPanel.add(Box.createHorizontalGlue()); // Has no effect.
extLabelWP.setDisplayedMnemonic(KeyEvent.VK_E);
extLabelWP.setLabelFor(mtFieldWP);
Click to expand...

By adding two dozen lines Paul could have made this into an SSCCE.
 
P

public boolean

Harold said:
You've made an incorrect assumption.
Click to expand...

Excuse me?

How rude!

I have, of course, done nothing of the sort.
You have failed
Click to expand...

Excuse me?

How rude!

I have, of course, done nothing of the sort.
It does center itself.
Click to expand...

It doesn't.

label.setBorder(new LineBorder(Color.BLUE)); // HP
Click to expand...

Don't want a border.
label.setMaximumSize(label.getPreferredSize()); // HP
Click to expand...

Shouldn't matter. I haven't needed this in similar situations
previously. Though it's not behaving as in similar situations previously...
By adding two dozen lines Paul could have made this into an SSCCE.
Click to expand...

Who is Paul?
 
P

public boolean

John said:
Paul again. How boring.
Click to expand...

Huh?

If you're talking about me, my name is John.

Regardless, your post appears to have nothing to do with anything else
in this thread, nor to do with Java.
 

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