Thread: How to enable wrapping in JTextPane

Hi, I have a question about the wrapping of JTextPanes. I have JTextPane inside a JScrollPane, and the way wrapping works is a little weird. Basically I want something like in Word: when you add text if it is too long it wraps at the next word. I know this is the default function of a JTextPane. When there isn't a word break, however, the JTextPane doesn't break the word in the middle of the word, but instead increases the size of the text pane (I think) to accommodate the larger word. This because the JTextPane is now bigger, any other text that I added earlier to the textpane which had previously word wrapped now extends to the new boundary of the textpane, and then wraps there.

How can I make it so that if the word is too big for the textpane, instead of extending the textpane it cuts the word and puts the rest of the word on the next line?

I have not had my JTextPanes change size on me. Please consider creating and posting an SSCCE demonstrating your problem so that we can see it for ourselves, and perhaps be able to help you find a solution.

Ok, I have made a small program that demonstrates the problem. It is written using the Netbeans Swing editor, as is the program that has this same problem.

If you run the program, when you type in the text field and press enter or press it adds the text to the text pane. If you just type normal length words, the wrapping works well. If you type 1 long word which is longer than the size of the text pane, however, it doesn't break at the end of the line but instead seems to increase the size of the text pane. If you had words that had wrapped before, now they wrap to the new boundary of the text pane. Now if you type words again into the text field and press send they also wrap to the new boundary.

Is there any way to fix this?

package testproject;
 
import java.awt.Color;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
 
public class TextPaneExample extends javax.swing.JFrame {
    private StyledDocument chatDoc;
    private SimpleAttributeSet selfNameStyle;
    private SimpleAttributeSet messageNameStyle;
 
    public TextPaneExample() {
        initComponents();
 
        selfNameStyle = new SimpleAttributeSet();
        StyleConstants.setForeground(selfNameStyle, Color.RED);
        StyleConstants.setBold(selfNameStyle, true);
 
        messageNameStyle = new SimpleAttributeSet();
 
        chatDoc = chatTextPane.getStyledDocument();
    }
 
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
 
        sendField = new javax.swing.JTextField();
        sendButton = new javax.swing.JButton();
        chatScrollPane = new javax.swing.JScrollPane();
        chatTextPane = new javax.swing.JTextPane();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        sendField.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sendFieldActionPerformed(evt);
            }
        });
 
        sendButton.setText("Send");
        sendButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sendButtonActionPerformed(evt);
            }
        });
 
        chatTextPane.setEditable(false);
        chatScrollPane.setViewportView(chatTextPane);
 
        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .addContainerGap()
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                    .add(chatScrollPane)
                    .add(layout.createSequentialGroup()
                        .add(sendField, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 300, Short.MAX_VALUE)
                        .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                        .add(sendButton)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .add(chatScrollPane, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 251, Short.MAX_VALUE)
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false)
                    .add(sendField)
                    .add(sendButton, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE))
                .addContainerGap())
        );
 
        pack();
    }// </editor-fold>
 
    private void sendButtonActionPerformed(java.awt.event.ActionEvent evt) {
        sendMessage();
    }
 
    private void sendFieldActionPerformed(java.awt.event.ActionEvent evt) {
        sendMessage();
    }
 
    private void sendMessage() {
        String txt = sendField.getText();
        if (!txt.equals("")) {
            try {
                chatDoc.insertString(chatDoc.getLength(), "You: ", selfNameStyle);
                chatDoc.insertString(chatDoc.getLength(), txt + "\n", messageNameStyle);
            } catch(Exception e) {
                System.err.println(e);
            }                
            sendField.setText("");
        }
    }
 
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(TextPaneExample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(TextPaneExample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(TextPaneExample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(TextPaneExample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TextPaneExample().setVisible(true);
            }
        });
    }
 
    // Variables declaration - do not modify
    private javax.swing.JScrollPane chatScrollPane;
    private javax.swing.JTextPane chatTextPane;
    private javax.swing.JButton sendButton;
    private javax.swing.JTextField sendField;
    // End of variables declaration
 
}

Originally Posted by kcaz

Ok, I have made a small program that demonstrates the problem. It is written using the Netbeans Swing editor, as is the program that has this same problem.

If you run the program, when you type in the text field and press enter or press it adds the text to the text pane. If you just type normal length words, the wrapping works well. If you type 1 long word which is longer than the size of the text pane, however, it doesn't break at the end of the line but instead seems to increase the size of the text pane. If you had words that had wrapped before, now they wrap to the new boundary of the text pane. Now if you type words again into the text field and press send they also wrap to the new boundary.

Is there any way to fix this?

The funny thing is, that when I run your code, I don't run into this problem. If I type in a long sentence, it wraps well, and then if I type in a single very long word, it breaks the word at the edge of the textcomponent, and the previously well-wrapped sentence remains displayed unchanged with its wrap point remaining unchanged.

When you run it, does the very long word wrap to the next line, or is it just cut off?

Originally Posted by kcaz

When you run it, does the very long word wrap to the next line, or is it just cut off?

It wraps to the next line. I'm using Windows 7.0, and am running this with Java 1.7.

That's so weird. Right now I'm running on Ubuntu with Java 1.7, but I get the same problem when I run it on Windows 7 with Java 1.7. Do you have any idea why they would be different?

I wish I did -- sorry!