Applying the SwingConstants.ALIGN_JUSTIFIED attribute to a JTextPane results in the text being centered and not justified as expected.

Here is some code that demonstrates the bug.  It produces a JFrame containing a JTextPane on the left hand side and a group of four buttons on the right hand side.  The buttons on the right hand side may be used to align the text.  Options available are left-justification, centered, right-justification and justified.  Pressing any of the first three buttons results in the text being aligned as expected.  However, pressing the justified button results in the text being centered.


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

public class TestAlignment extends JFrame
{
  private JTextPane myTextPane;
  private SimpleAttributeSet sas;
  private StyledDocument theDocument;

  public TestAlignment()
  {
    super();

    setSize( 500, 500);
    getContentPane().setLayout( new GridLayout( 1, 2));

    myTextPane = new JTextPane();
    myTextPane.setSize( 250, 250);
    getContentPane().add( myTextPane);
    myTextPane.setText( "A long line of text for testing alignment");

    sas = new SimpleAttributeSet();

    JButton leftAlignButton = new JButton( "left");
    JButton rightAlignButton = new JButton( "right");
    JButton centreButton = new JButton( "centered");
    JButton justifyButton = new JButton( "justified");

    JPanel buttonPanel = new JPanel();

    leftAlignButton.addActionListener( new ActionListener() {
      public void actionPerformed( ActionEvent e)
      {
        StyleConstants.setAlignment( sas, StyleConstants.ALIGN_LEFT);
        myTextPane.setParagraphAttributes( sas, false);

        myTextPane.repaint();
      }
    });

    rightAlignButton.addActionListener( new ActionListener() {
      public void actionPerformed( ActionEvent e)
      {
        StyleConstants.setAlignment( sas, StyleConstants.ALIGN_RIGHT);
        myTextPane.setParagraphAttributes( sas, false);

        myTextPane.repaint();
      }
    });

    centreButton.addActionListener( new ActionListener() {
      public void actionPerformed( ActionEvent e)
      {
        StyleConstants.setAlignment( sas, StyleConstants.ALIGN_CENTER);
        myTextPane.setParagraphAttributes( sas, false);

        myTextPane.repaint();      }
    });

    justifyButton.addActionListener( new ActionListener() {
      public void actionPerformed( ActionEvent e)
      {
        StyleConstants.setAlignment( sas, StyleConstants.ALIGN_JUSTIFIED);
        myTextPane.setParagraphAttributes( sas, false);

        myTextPane.repaint();
      }
    });

    buttonPanel.add( leftAlignButton);
    buttonPanel.add( centreButton);
    buttonPanel.add( rightAlignButton);
    buttonPanel.add( justifyButton);

    getContentPane().add( buttonPanel);
  }

  public static void main( String args[])
  {
    TestAlignment myFrame = new TestAlignment();
    myFrame.show();
  }
}


java -version
java version "1.2"
Classic VM (build JDK-1.2-V, native threads)

java -fullversion
JAVA.EXE full version "JDK-1.2-V"
(Review ID: 94114) 
======================================================================




I have been trying to build a text-processor using the HTMLEditorKit, the AlignmentAction Left, Right and Centered works fine, but the AlignmentAction Justified it doesn't work
the result of the action is a text Centered, instead of a text Justified.  

public class AlignJustifiedAction extends StyledEditorKit.AlignmentAction
	{
AlignJustifiedAction()
		{
		 super("ALIGN_JUSTIFIED",StyleConstants.ALIGN_JUSTIFIED);
		 }		
}....
(Review ID: 95233)
======================================================================


  xxxxx@xxxxx   2003-12- customer 

Same problem has been reported by a CAP member:

Test case:
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;

public class MyJTextPane extends JFrame {
	
	SimpleAttributeSet sas;
	JTextPane tp;
	
	public MyJTextPane() {
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setTitle("Double click switches left and justified align.");

		String s = "When Mr. Bilbo Baggins of Bag End announced" +
				"that he would shortly be celebrating his eleventy-first" +
				"birthday with a party of special magnificence, there" +
				"was much talk an excitement in Hobbiton.";

		tp = new JTextPane();
		sas = new SimpleAttributeSet();
		StyleConstants.setAlignment(sas, StyleConstants.ALIGN_JUSTIFIED);
		StyleConstants.setBold(sas, true);		
		tp.setText(s);
		tp.setParagraphAttributes(sas, true);
		tp.setEnabled(false);
		
		tp.addMouseListener(new MouseAdapter() {
			
			public void mouseClicked(MouseEvent e) {
				if(e.getClickCount() == 2) {
					if(StyleConstants.getAlignment(sas)
							==StyleConstants.ALIGN_JUSTIFIED) {
						StyleConstants.setAlignment(sas,
											StyleConstants.ALIGN_LEFT);
						tp.setParagraphAttributes(sas, true);
					}
					else {
						StyleConstants.setAlignment(sas,
											StyleConstants.ALIGN_JUSTIFIED);
						tp.setParagraphAttributes(sas, true);
					}
				}
			}
		});
		
		this.getContentPane().add(new JScrollPane(tp));
		this.setSize(400, 200);
		this.show();
	}

	public static void main(String[] args) {
		MyJTextPane pane = new MyJTextPane();
	}
}
Posted Date : 2005-07-28 15:11:37.0

N/A

There is no code to display justified yet.
  xxxxx@xxxxx   1999-08-23

we are targeting to fix this bug for mustang release
<note>
It is unlikely the fix will be back-ported to 1.5 update release because it might
be impossible to address this problem without introducing new public API (We
can not introduce new public API in update releases)
</note>
  xxxxx@xxxxx   2005-03-23 22:27:49 GMT
  xxxxx@xxxxx   2005-03-23 22:42:23 GMT
At this time we are going to support justification only for non i18n documents.

We justify row by extending spaces by the same amount.
"justifiable" row starts after the rightmost TAB.
leading and trailing spaces are non extendable.
(This how justification works in MS Word)

P.S. While working on this I found a regression in FlowView
introduced in mustang by the fix for
4855207: [Fix for 4250864: Low performance in JTextPane when paragraph has a lot
of text]

In some cases Views in paragraph left as children of LogicalView. They shoud be
children of a Row instead.
Posted Date : 2005-08-26 16:12:55.0

This fix goes to mustang and will be backported to 1.5 update release
http://sa.sfbay.sun.com/projects/swing_data/mustang/4263904.1
Posted Date : 2005-08-12 19:06:06.0

I am facing the same problem and am in an urgency to solve it.  Gotta meet project deadlines you know.  So 
if this bug is fixed please inform me by email at danny@cyberoffice.com

Thanks

I've almost finish the development, and I've found this 
bug. I can't go on, 'cause in I'm developing a legal soft, 
and law demands text justified. Let me know when you fix it 
(soon, please!!!) to pruna@sinectis.com.ar or let me know 
if I can help with the development.

Would you please let me know when you are going to 
implement this feature? I'm out of schedule and I need to 
give at least this info to my customer.

Possible workaround (but I could just be talking out of my @$$):
I'm not sure if this could be implemented into an actual JTextPane because I don't believe the access is 
granted at this level, but you might if you subclassed it.  My thought for an immediate workaround (for 
those that need this ASAP and have posted such needs above) is to draw the text using drawString().  This 
would of course prevent the text from being editable, but you could make your justification.

Justifying text should be a simple matter of finding the total stringWidth() of all words in a line (tokenize 
around the space character) and then subtracting that total pixel width from your available width.  The 
number you have left is what is devoted to spacing.  Divide that number by (wordCountPerLine - 1) and 
you'll have your offset to draw the individual word Strings.

  As I've said, I have not looked into the JTextPane class, but you may be able to implement this algorithm 
into a JTextPane-subclass to provide justified text in an editable field.

Forget the justification, the real bug is that the text is centered.
Otherwise, html meant to be justified would look acceptable. That
much should be easy to fix, and can be worked-around in various
ways.

we also face the same bug so kidly give the solution if any
and mail me if solved

I tried the Word Processor from ThinkFree Office before...
and they have managed to "Justified" the text... they 
should be using pure Java Swing package also... my question 
is : how they managed to fix the bug before the 
true "originator" fixed it... ?? mm.. hope to get the 
solution soon. all the best.

Thanks.

Same Problem here
My test editor is complete , execpt for the JustifiedAction

Please let me know when you resolve this bug

I m working on frontpage like htmleditor, all is done 
except the justify part, pls let me know when this bug is 
fixed.

Same problem. Is anyone going to fix it eventually? 

I need correct justify alignment, too. But when I see that
this bug is about 3 YEARS old and has not been fixed yet I
don't have much hope that this will change soon. Damn, what
is the problem? Do I really have to implement it myself???

Hey I have problem related to highlighting words in 
JTextPane using HighLighter.addHighLight(....) .The 
highlighted portion is not at the appropriate palce and it 
hovers around the desired word. Plz give me mail if u have 
any solutions.

The CENTER/JUSTIFIED error is in the getAlignment() method 
of javax.swing.text.ParagraphView, which returns: 0=left, 
1=right, 0.5=center, 0.5=justified. The return value is 
supposed to represent the proportion of blank space 
(totalwidth-linewidth) which should precede the beginning of 
the line. The whole concept of JUSTIFIED text just doesn't fit 
this idea at all... It's easy to change the method to return 
0=justified (so that JUSTIFIED and LEFT are identical), but as 
for fixing JUSTIFIED completely, I wonder if they might have 
to break a fair bit of running code to do that.

I need this feature as well. By the way, this is not the case in other countries but in France, justified is the default formatting...

I can't go on, because I'm developing software and law 
demands text justified. Let me know when you fix it: 
maba@softwareag.com.

Not having justified text is a huge problem however, this
can't be properly implemented because of bug 4352983. As
soon as you have justified text and try to print, the text
is no longer justified. The right border is not aligned
properly. 

We have implemented justified text however we have to
disable it as well as right justified because of the
printing issue. Combining these two bug votes is 209. This
is obviously a huge problem for many users. 

Both these bugs have been around since 2000. I really want
to continue using Java however, this makes it extremely
difficult as our application is essentially crippled. Our
app targets the mortgage industry where companies are
printing up to 1 million docs per month. Please fix this in
1.4.2.

Our end user just told us that under no circumstance is the 
app (a Client Reporting system with textual market 
commentaries in there)  going live without the text being 
justified (which sort of puts us in a bad place, given that the 
feature is not supported).  I'm off to check out some 
alternative fixes / workarounds.  If anything comes up, I'll 
post it.

Guys, if we want this fixed, we're going to have to vote for 
it.  Vote early, vote often, vote now!!

have the same problem - fix would be most appreciated.

I'm developing a legal soft too, please mail me if solved

I need to write justified in my JTextPane. Please inform me 
when it solved

does lava provides some solution for text justification????

I am facing the text justification problem and am in an 
urgency to solve it.  any alternate approach tried by anyone 
or if this bug is fixed please inform me by email at 
pgrao77@yahoo.com

I am facing the text justification problem and am in an 
urgency to solve it.  any alternate approach tried by anyone 
or if this bug is fixed please inform me by email at 
pgrao77@yahoo.com

What happen Sun???, itīs a problem since Aug 19, 1999, 
threre are 4 years!!!!!, its the solutions of a big 
company!!!!!!!!, too Bad!!!!!

As most posts stating an urgent need of the JUSTIFIED 
alignment in JEditorPane were in year 2000/2001 I'd like to 
state "still some dev. around needing this not less urgently"

ah ya, and please give me 10 more radio buttons to vode for 
this!!

Why this bug fixing takes 2-3 years? Will it be solved in near 
future?

I was helping my friend build an text editor when we suddenly 
run across this error. can java device an alternative solution 
to remedy this problem?

Justified text align is an important feature of many commercial 
applications. There are over 200 votes. Why does it take so 
long to fix this bug?

really bad thing

This is a known bug since 1999, there are more than 200 
votes and these comments to these bug from 2000 until 
today so a lot of Java users need the fix for this bug.
I think these are enough reasons to give it a high priority but 
Sun seems to ignore this bug until today because currently 
version 1.4.2_x is available and it is not fixed and it seems 
that it will not be fixed in the next versions.
Does Sun consider this bug parade when it decide which 
features will be in a new version? If yes, then it should 
consider these bugs with a lot of votes and user comments 
since a long time!!

There's a workaround for this at:

http://forum.java.sun.com/thread.jsp?
forum=57&thread=289879

It worked great for me.

I am facing the same problem and am in an urgency to 
solve it.

when will sun release the fix for this Justified alignment problem ..... Dear SUN, please give a solution for this ... it is being pending from 1999 which is a very very long delay ..... PROJECTS ARE BEING SCRAPED BCOZ OF THIS PROBLEM

I don't understand ...
Why This is Still Pending..??
This is most  important requirement for software appilcation development.
Why Sun Microsystem is not taking it seriosuly...

My project is Crashing Only due to This BUG.
PLEASE DO SOME THING FAST-
THANKS.

PLEASE ..ATLEAST LET ME KNOW...
WHEN THIS WILL BE SOLVED OUT
PLEASE...

THX.

My personal opinion: It won't be.  Plan a workaround.

Still happens in 1.5.0_03 for Windows...
Almost 6-years-old bug...  I sold the idea of using java instead of M$ platform and now... What a great support from Sun...