Keeping the Correct Style on Text Retrieval

Keeping the correct style on text retrieval

This has been solved by merging the document models of the two panes. The solution is in this question: Keeping the format on text retrieval

Keeping the format on text retrieval

Use the example to merge both Documents
http://java-sl.com/tip_merge_documents.html

Strange text wrapping with styled text in JTextPane with Java 7

for futures readers, bug is still present in JDK 1.7.0_04.,

comparing Java7 and with stable Java6,

<------ Java7 v.s. Java6 --->

<------ Java7 v.s. Java6 --->

<------ Java7 v.s. Java6 --->

<------ Java7 v.s. Java6 --->

from code

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

public class BugWrapJava7 {

    private JFrame frame = new JFrame();
    private JTextPane jtp;
    private StyledDocument doc;

    public BugWrapJava7() {
        jtp = new JTextPane();
        jtp.setText("\ntype some text in the above empty line and check the wrapping behavior");
        doc = jtp.getStyledDocument();
        doc.addDocumentListener(new DocumentListener() {

            public void insertUpdate(DocumentEvent e) {
                insert();
            }

            public void removeUpdate(DocumentEvent e) {
                insert();
            }

            public void changedUpdate(DocumentEvent e) {
                insert();
            }

            public void insert() {
                SwingUtilities.invokeLater(new Runnable() {

                    public void run() {
                        Style defaultStyle = jtp.getStyle(StyleContext.DEFAULT_STYLE);
                        doc.setCharacterAttributes(0, doc.getLength(), defaultStyle, false);
                    }
                });
            }
        });
        JScrollPane scroll = new JScrollPane(jtp);
        scroll.setPreferredSize(new Dimension(200, 200));
        frame.add(scroll);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                BugWrapJava7 bugWrapJava7 = new BugWrapJava7();
            }
        });
    }
}

JTextPane highlighting issue

A JTextComponent's getText() and A JTextPane/JEditorPane's getText() has different implementation. JTextPane/JEditorPane uses EditorKit to write the document content(text) to a StringWriter and then return the text with formatting and inserting a line/paragraph break into the document. But the JTextCompoent returns document content directly by:

document.getText(0, document.getLength());

You will better understand if you try to compare the length : jTextPane1.getText().length() and jTextPane1().getDocument().getLength().

Reproducing the difference in length by inserting string with:

DefaultStyleDocument.insertString(0, str, primaryStyle)

when str = "I\n not"   ; document length = 6, getText().length = 7
when str = "I\r\n not" ; document length = 7, getText().length = 8
when str = "I\n\n not" ; document length = 7, getText().length = 9!

So, in your high-lighting text program try reading the content text using:

DefaultStyledDocument document = (DefaultStyledDocument) jTextPane1.getDocument();
try {
    contText = document.getText(0, document.getLength());
} catch (BadLocationException ex) {
     Logger.getLogger(JTextPaneTest.class.getName()).log(Level.SEVERE, null, ex);
 }

Then search for your selected text position in the contText as you were doing and you should be good to go. Because, highlighter.addHighlight(int p0, int p1, Highlighter.HighlightPainter p) uses the document for position offset.

Use CaretListener:

To Highlight upon text selection, It is better to use CaretListener, no need to add mouse and key board selection handling code at all:

jTextPane1.addCaretListener(new CaretListener() {
        public void caretUpdate(CaretEvent evt) {
            if(evt.getDot() == evt.getMark())return;

    JTextPane txtPane = (JTextPane) evt.getSource();
    DefaultHighlighter highlighter = (DefaultHighlighter) txtPane.getHighlighter();
    highlighter.removeAllHighlights();
    DefaultHighlightPainter hPainter = new DefaultHighlightPainter(new Color(0xFFAA00));
    String selText = txtPane.getSelectedText();
    String contText = "";// = jTextPane1.getText();

    DefaultStyledDocument document = (DefaultStyledDocument) txtPane.getDocument();

    try {
        contText = document.getText(0, document.getLength());
    } catch (BadLocationException ex) {
        Logger.getLogger(JTextPaneTest.class.getName()).log(Level.SEVERE, null, ex);
    }

    int index = 0;

    while((index = contText.indexOf(selText, index)) > -1){

        try {
            highlighter.addHighlight(index, selText.length()+index, hPainter);
            index = index + selText.length();
        } catch (BadLocationException ex) {
            Logger.getLogger(JTextPaneTest.class.getName()).log(Level.SEVERE, null, ex);
           //System.out.println(index);
        }
       }
        }
    });

Styling text in a JTextArea or JTextPane

If you want to diplaying Html contents in the JTextPane then you have to set for JTextPane#setContentType("text/html");, example here

EDIT:

for JEditorPanes / JTextPanes is there another way by implements StyledDocument, MutableAttributeSet and with customized Highlighter, example here

a.m. way is without using Html syntax

Get all text of specific style from JTextPane

You can define your own attribute and place it with all the other ones. Just use SimpleAttributeSet and place there the new attribute (let's name it "MessageTypeAttribute") the value could be string constants for each required type.

To iterate the Document use getCharacterElement() method. Start from 0 and then move to the end offset of the element to retrieve the next one.

JTextPane: How to set the font size

Sure, you can create a font object and use it to set the font of your text pane.
Instantiate it like this:

    Font f = new Font(Font.SANS_SERIF, 3, 5);

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