Problems with JTextPane line wrapping

Question

Hi to all.
I'm using a code like this to make editable a figure that I paint with Java 2D. This JTextPane don't has a static size and for that, the text in it cannot be seen affected by the natural line wrap of the JTextPane component. The problem is that I have to set a maximun size for the JTextPane and I want to use the line wrap only when the width of the JTextPane be the maximun width. How can I do this?
public class ExampleFrame extends JFrame {
    ExamplePane _panel;
    public ExampleFrame() {
        this.setSize(600, 600);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        _panel = new ExamplePane();
        getContentPane().add(_panel);
        this.setVisible(true);
    public static void main(String[] args) {
        ExampleFrame example = new ExampleFrame();
    public class ExamplePane extends JPanel {
        public ExamplePane() {
            this.setBackground(Color.RED);
            this.setLayout(null);
            this.add(new ExampleText());
    public class ExampleText extends JTextPane implements ComponentListener, DocumentListener,
            KeyListener {
        public ExampleText() {
            StyledDocument doc = this.getStyledDocument();
            MutableAttributeSet standard = new SimpleAttributeSet();
            StyleConstants.setAlignment(standard, StyleConstants.ALIGN_RIGHT);
            doc.setParagraphAttributes(0, 0, standard, true);
            this.setText("Example");
            this.setLocation(300, 300);
            this.setSize(getPreferredSize());
            this.addComponentListener(this);
            getDocument().addDocumentListener(this);
            this.addKeyListener(this);
        public void componentResized(ComponentEvent e) {
        public void componentMoved(ComponentEvent e) {
        public void componentShown(ComponentEvent e) {
        public void componentHidden(ComponentEvent e) {
        public void insertUpdate(DocumentEvent e) {
            Dimension d = getPreferredSize();
            d.width += 10;
            setSize(d);
        public void removeUpdate(DocumentEvent e) {
        public void changedUpdate(DocumentEvent e) {
        public void keyTyped(KeyEvent e) {
        public void keyPressed(KeyEvent e) {
        public void keyReleased(KeyEvent e) {
}Thanks for read.

Answer 1

I'm working hard about that and I can't find the perfect implementation of this. This is exactly what I want to do:
1. I have a Ellipse2D element painted into a JPanel.
2. This ellipse is painted like a circle.
3. Into the circle there's a text area, that user use to name the cicle.
4. The text area is a JTextPane.
5. When the user insert a text area, it can increase it size, but it can't be bigger than the circle that it contains.
6. There is a maximun and a minimun size for the circle.
7. When the user write into de JTextPane, it grows until arriving at the limit.
8. When the JTextPane has the width size limit, if the user writes more text into it, the JTextPane write it into another line.
9. The size of the JTextPane has to be the optimun size, it cannot have empty rows or empty lines.
This code does all this except 9, cause if the user remove some text of the text area, the form of the JTextPane changes to a incorrect size.
public class ExampleFrame extends JFrame {
    ExamplePane _panel;
    public ExampleFrame() {
        this.setSize(600, 600);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        _panel = new ExamplePane();
        getContentPane().add(_panel);
        this.setVisible(true);
    public static void main(String[] args) {
        ExampleFrame example = new ExampleFrame();
    public class ExamplePane extends JPanel {
        public ExamplePane() {
            this.setBackground(Color.RED);
            this.setLayout(null);
            this.add(new ExampleText());
    public class ExampleText extends JTextPane implements ComponentListener, DocumentListener,
            KeyListener {
        public ExampleText() {
            StyledDocument doc = this.getStyledDocument();
            MutableAttributeSet standard = new SimpleAttributeSet();
            StyleConstants.setAlignment(standard, StyleConstants.ALIGN_CENTER);
            doc.setParagraphAttributes(0, 0, standard, true);
            this.setText("Example");
            this.setLocation(300, 300);
            this.setSize(getPreferredSize());
            //If it has the maximun width and the maximun height, the user cannot
            //write into the JTextPane
            /*AbstractDocument abstractDoc;
            if (doc instanceof AbstractDocument) {
            abstractDoc = (AbstractDocument) doc;
            abstractDoc.setDocumentFilter(new DocumentSizeFilter(this, 15));
            this.addComponentListener(this);
            getDocument().addDocumentListener(this);
            this.addKeyListener(this);
        public void componentResized(ComponentEvent e) {
        public void componentMoved(ComponentEvent e) {
        public void componentShown(ComponentEvent e) {
        public void componentHidden(ComponentEvent e) {
        public void insertUpdate(DocumentEvent e) {
            Runnable doRun = new Runnable() {
                public void run() {
                    int MAX_WIDTH = 200;
                    Dimension size = getSize();
                    Dimension preferred = getPreferredSize();
                    if (size.width < MAX_WIDTH) {
                        size.width += 10;
                    } else {
                        size.height = preferred.height;
                    setSize(size);
            SwingUtilities.invokeLater(doRun);
        public void removeUpdate(DocumentEvent e) {
            this.setSize(this.getPreferredSize());
        public void changedUpdate(DocumentEvent e) {
        public void keyTyped(KeyEvent e) {
        public void keyPressed(KeyEvent e) {
        public void keyReleased(KeyEvent e) {
}I know that the problem is into the removeUpdate method, but I have to set to the JTextPane, allways the optimun size, how can I do this?
Thanks to all.
Edited by: Daniel.GB on 06-jun-2008 18:32