Find the offset to a String in a JTextPane

Question

I'm looking for a quick way to find a String in a JTextPane and change the style there, so it gets highlighted. What I currently have is something like this (tpOutput is the JTextPane in question, strSearch the String to be searched.. duh):

int index = tpOutput.getText().indexOf(strSearch);
StyledDocument doc = tpOutput.getStyledDocument();
doc.setCharacterAttributes(i, strSearch.length(), doc.getStyle("exampleStyle") , false);

However, as beautiful as that would be if it worked, it counts wrong on newline characters, so if I search the text "foobar" in

foobarTTT
abcd123
abcd123

it would highlight "foobar" in the first line correctly. However, in

abcd123
abcd123
foobarTTT

it would highlight "obarTT" (and the following 2 whitespaces if they exist)

I'm probably doing the whole thing wrong, trying to get the offset easy using just the text. Anyone know the proper way to do this?

Depew

How does it loop? the above code looks like it would find the first occurence only – Shippen

You're correct. For my purposes, only the first occurence is important. I stated the example wrong, sorry. – Depew

Answer 1

You can also use a Highlighter, discussed in How to Use Text Fields: Another Example: TextFieldDemo.

Alienate

Answer 2

IndexOutOfBounds is maybe from doc.getStyle("exampleStyle"), by using MutableAttributeSet works for me,

can you demonstrated your issue with IndexOutOfBounds by using this SSCCE

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

public class TextPaneAttributes extends JFrame {

    private static final long serialVersionUID = 1L;

    public TextPaneAttributes() {
        final JTextPane textPane = new JTextPane();
        StyledDocument doc = textPane.getStyledDocument();
        final MutableAttributeSet standard = new SimpleAttributeSet();
        StyleConstants.setAlignment(standard, StyleConstants.ALIGN_CENTER);
        doc.setParagraphAttributes(0, 0, standard, true);
        MutableAttributeSet keyWord = new SimpleAttributeSet();
        StyleConstants.setForeground(keyWord, Color.red);
        StyleConstants.setItalic(keyWord, true);
        textPane.setText("one\ntwo\nthree\nfour\nfive\nsix\nseven\neight\n");
        doc.setCharacterAttributes(0, 3, keyWord, false);
        doc.setCharacterAttributes(19, 4, keyWord, false);
        try {
            doc.insertString(0, "Start of text\n", null);
            doc.insertString(doc.getLength(), "End of text\n", keyWord);
        } catch (Exception e) {
        }
        final MutableAttributeSet selWord = new SimpleAttributeSet();
        StyleConstants.setForeground(selWord, Color.blue);
        StyleConstants.setItalic(selWord, true);
        JScrollPane scrollPane = new JScrollPane(textPane);
        scrollPane.setPreferredSize(new Dimension(200, 200));
        add(scrollPane);

        JToggleButton toggleButton = new JToggleButton("where is 'four'");
        toggleButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                //AbstractButton abstractButton = (AbstractButton) actionEvent.getSource();
                //boolean selected = abstractButton.getModel().isSelected();
                int index = textPane.getText().indexOf("four");
                StyledDocument doc = textPane.getStyledDocument();
                doc.setCharacterAttributes(index, 4, selWord, false);
            }
        });
        add(toggleButton, BorderLayout.SOUTH);
    }

    public static void main(String[] args) {
        Runnable doRun = new Runnable() {

            @Override
            public void run() {
                TextPaneAttributes frame = new TextPaneAttributes();
                frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
                frame.pack();
                frame.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(doRun);
    }
}

Pluviometer

Answer 3

my guess: maybe there's a difference in what newline characters are used in JTextPane and StyledDocument, let's say JTextPane uses \n and StyledDocument uses \r\n

Treen

+1, Yes, this can be a problem when using a JTextPane. See Text and New Lines for more information and a solution. – Boreal

Answer 4

I observed the same thing and I used this code to adjustment:

  private int countCarrierReturns(StringBuilder sb, int end) {
        final String cr = "\r";
        int lines = 0;
        int init = sb.indexOf(cr, 0);

        if (init == -1) {
            return 0;
        }

        while (init < end) {
            lines++;

            init = sb.indexOf(cr, init + 1);
        }

        return lines;
    }

the 'int end' is my first char to apply style.

Turco