Line Highlighting in a JTextPane/JEditorPane with a text file as an input

this code might help you

import javax.swing.JTextPane;
import javax.swing.JFrame;
import javax.swing.text.StyledDocument;
import javax.swing.text.StyleConstants;
import javax.swing.text.MutableAttributeSet;

import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.event.WindowAdapter;

import java.awt.Color;
import java.awt.Font;
import java.awt.BorderLayout;

public class TextPaneExample extends WindowAdapter {

    public TextPaneExample() {
        JFrame f = new JFrame("Second JTextPane Example");
        f.getContentPane().setLayout(new BorderLayout());


        JTextPane text = new JTextPane();
        Font font = new Font("Serif", Font.ITALIC, 20);
        MutableAttributeSet attrs = text.getInputAttributes();
        StyledDocument doc = text.getStyledDocument();
        StyleConstants.setForeground(attrs, Color.yellow);
            StyleConstants.setBackground(attrs, Color.red);
        doc.setCharacterAttributes(10, doc.getLength() + 1, attrs, false);

        f.getContentPane().add(text, BorderLayout.CENTER);

        // Listen for the user to click the frame's close box
        f.addWindowListener(this);
        f.setSize(400, 400);
        f.show();
    }


    public void windowClosing(WindowEvent evt) {
        System.exit(0);
    }

    public static void main(String[] args) {
        TextPaneExample3 instance = new TextPaneExample3();
    }

}

These links will help you find the line number

http://www.developer.com/java/other/article.php/3318421

http://groups.google.com.pk/groups?hl=en&lr=&ie=UTF-8&threadm=imRg8.45902%24Hg1.7823978%40news6-win.server.ntlworld.com&rnum=1&prev=/groups%3Fq%3DJEditorPane%2B%2BLine%2Bnumber%26hl%3Den%26lr%3D%26ie%3DUTF-8%26selm%3DimRg8.45902%2524Hg1.7823978%2540news6-win.server.ntlworld.com%26rnum%3D1

there were 2 answers to my question ... & i think even after combining both of them, im not getting it!!
The code u provided, will highlight the input chars. ok., let me be more precise.

1) load a text file to textPane
2) while loading, the line nos should be automatically prefixed for the file
3) given a line no., goto a line no # & highlight the entire line no

i tried modifying the code but still not able to get what i wanted., pl help !!

I think you should just select that line.
;JOOP!

i dont get it !!
well all im asking is the algorithm for 2 functions -
-> loadLineNumberedFile(JTextPane, File) - which will load a text file with line nos
-> highlightLine(JTextPane,int) - given a line no, goes to the line no & Highlights it

>>-> highlightLine(JTextPane,int) - given a line no, goes to the line no & Highlights it
mpriyatam,
i am working on it.

>>-> highlightLine(JTextPane,int) - given a line no, goes to the line no & Highlights it
its done here. some bugs migth be there.

it may help you.


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

import javax.swing.*;
import javax.swing.JTextPane;
import javax.swing.JFrame;
import javax.swing.text.StyledDocument;
import javax.swing.text.StyleConstants;
import javax.swing.text.MutableAttributeSet;

import java.util.StringTokenizer;

import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.event.WindowAdapter;

import java.awt.Color;
import java.awt.Font;
import java.awt.BorderLayout;

public class TextPaneExample extends WindowAdapter {
JFrame f = new JFrame("Second JTextPane Example");
    public TextPaneExample() {

        f.getContentPane().setLayout(new BorderLayout());
          JMenuBar menuBar = new JMenuBar();



        final JTextPane text = new JTextPane();
        Font font = new Font("Serif", Font.ITALIC, 20);
        MutableAttributeSet attrs = text.getInputAttributes();
        StyledDocument doc = text.getStyledDocument();
        StyleConstants.setForeground(attrs, Color.blue);
        doc.setCharacterAttributes(0, doc.getLength() + 1, attrs, false);

               init(text);

          // Create a menu
            JMenu menu = new JMenu("Goto Line No.");

            JMenuItem item = new JMenuItem("Select Line No.");
            item.addActionListener(new ActionListener(){
                  public void actionPerformed(ActionEvent e){
                        SelectLineNo lineNo = new SelectLineNo(null, true);
                        Font font = new Font("Serif", Font.ITALIC, 20);
                        MutableAttributeSet attrs = text.getInputAttributes();
                        StyledDocument doc = text.getStyledDocument();
                        StyleConstants.setForeground(attrs, Color.yellow);
                        StyleConstants.setBackground(attrs, Color.red);

                        String str = text.getText();

                        int tokens = 0;
                        StringTokenizer tokenizer = new StringTokenizer(str,new String("\n"));
                    tokens = tokenizer.countTokens();

                        int count = 0;
                        int count1 = 0;
                        int line = lineNo.getLineNumber();

                        System.out.println("line: " + line);
                        int lineCount = 0;
                        for(;tokenizer.hasMoreTokens();){
                              if(lineCount < line)
                                    count += tokenizer.nextToken().length();
                              else if(lineCount == line){
                                    count1 = count + tokenizer.nextToken().length();
                                    break;
                              }
                              lineCount++;
                        }

                        doc.setCharacterAttributes(count, count1, attrs, false);

                        StyleConstants.setForeground(attrs, Color.blue);
                        StyleConstants.setBackground(attrs, Color.white);
                        doc.setCharacterAttributes(0, count, attrs, false);
                        doc.setCharacterAttributes(count1, doc.getLength(), attrs, false);
                  }
            });
            menu.add(item);

            menuBar.add(menu);


         f.setJMenuBar(menuBar);
         f.getContentPane().add(text, BorderLayout.CENTER);

        // Listen for the user to click the frame's close box
        f.addWindowListener(this);
        f.setSize(400, 400);
        f.show();
    }

      private void init(final JTextPane text){

            final JPopupMenu menu = new JPopupMenu();

                // Create and add a menu item
                JMenuItem item = new JMenuItem("Select Line No.");
                item.addActionListener(new ActionListener(){
                        public void actionPerformed(ActionEvent e){

                        SelectLineNo lineNo = new SelectLineNo(null, true);


                        Font font = new Font("Serif", Font.ITALIC, 20);
                        MutableAttributeSet attrs = text.getInputAttributes();
                        StyledDocument doc = text.getStyledDocument();
                        StyleConstants.setForeground(attrs, Color.yellow);
                        StyleConstants.setBackground(attrs, Color.red);

                        String str = text.getText();

                        int tokens = 0;
                        StringTokenizer tokenizer = new StringTokenizer(str,new String("\n"));
                    tokens = tokenizer.countTokens();

                        int count = 0;
                        int count1 = 0;
                        int line = lineNo.getLineNumber();

                        System.out.println("line: " + line);
                        int lineCount = 0;
                        for(;tokenizer.hasMoreTokens();){
                              if(lineCount < line)
                                    count += tokenizer.nextToken().length();
                              else if(lineCount == line){
                                    count1 = count + tokenizer.nextToken().length();
                                    break;
                              }
                              lineCount++;
                        }

                        doc.setCharacterAttributes(count, count1, attrs, false);

                        StyleConstants.setForeground(attrs, Color.blue);
                        StyleConstants.setBackground(attrs, Color.white);
                        doc.setCharacterAttributes(0, count, attrs, false);
                        doc.setCharacterAttributes(count1, doc.getLength(), attrs, false);
                        }
                  });
                menu.add(item);

                // Set the component to show the popup menu
                text.addMouseListener(new MouseAdapter() {
                    public void mousePressed(MouseEvent evt) {
                        if (evt.isPopupTrigger()) {
                            menu.show(evt.getComponent(), evt.getX(), evt.getY());
                        }
                    }
                    public void mouseReleased(MouseEvent evt) {
                        if (evt.isPopupTrigger()) {
                            menu.show(evt.getComponent(), evt.getX(), evt.getY());
                        }
                    }
                });
      }
    public void windowClosing(WindowEvent evt) {
        System.exit(0);
    }

    public static void main(String[] args) {
        TextPaneExample instance = new TextPaneExample();
    }

}


class SelectLineNo extends JDialog implements ActionListener{

      JTextField txtField = new JTextField();
      JButton btnOk = new JButton("Ok");
      int lineNumber = 0;

      public SelectLineNo(Dialog dlg, boolean modal){
            btnOk.setName("Ok");
            this.getContentPane().add(txtField, BorderLayout.CENTER);
            this.getContentPane().add(btnOk, BorderLayout.SOUTH);
            btnOk.addActionListener(this);
            this.setTitle("Select Line no.");
            this.setSize(200, 100);
            this.setModal(modal);
        this.show();
      }

      public void actionPerformed(ActionEvent event){
            Object obj = event.getSource();

            if(obj instanceof JButton){
                  if(((JButton)obj).getName().equalsIgnoreCase("Ok")){
                        String str = txtField.getText();

                        if(str != null && ! str.equals("")){
                              try{
                                    lineNumber = Integer.parseInt(str);
                              }catch(Exception ex){
                                    lineNumber = 0;
                              }
                        }
                        this.setVisible(false);
                  }
            }
      }

      int  getLineNumber(){
            return lineNumber;
      }
}

fantastic!! the jumping/ highlighting works. Let me see if I can combine your code with the code here
http://www.developer.com/java/other/article.php/3318421

which automatically generates ... line nos.

I just want the file to be loaded with file nos generated  

thanks a ton !!! I will try & get back to you .. in case you have the complete solution please do try !

here is the modified source


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

import java.util.StringTokenizer;

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


class LNTextPane1 extends JFrame {
    public LNTextPane1() {
        JEditorPane edit = new JEditorPane();
        edit.setEditorKit(new NumberedEditorKit());

            init(edit);
        JScrollPane scroll = new JScrollPane(edit);
        getContentPane().add(scroll);
        setSize(300, 300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }


          private void init(final JEditorPane edit){

                  final JPopupMenu menu = new JPopupMenu();

                      // Create and add a menu item
                      JMenuItem item = new JMenuItem("Select Line No.");
                      item.addActionListener(new ActionListener(){
                              public void actionPerformed(ActionEvent e){

                              SelectLineNo lineNo = new SelectLineNo(null, true);

                              String str = edit.getText();

                              int tokens = 0;
                              StringTokenizer tokenizer = new StringTokenizer(str,new String("\n"));
                          tokens = tokenizer.countTokens();

                              int count = 0;
                              int count1 = 0;
                              int line = lineNo.getLineNumber() - 1;
                              int lineCount = 0;

                              if(line >= 0){
                                    for(;tokenizer.hasMoreTokens();){
                                          if(lineCount < line)
                                                count += tokenizer.nextToken().length();
                                          else if(lineCount == line){
                                                count1 = count + tokenizer.nextToken().length();
                                                break;
                                          }
                                          lineCount++;
                                    }
                              }
                              edit.setSelectionStart(count);
                              edit.setSelectionEnd(count1);
                              edit.setSelectedTextColor(Color.yellow);
                              edit.setSelectionColor(Color.blue);
                              }
                        });
                      menu.add(item);

                      // Set the component to show the popup menu
                      edit.addMouseListener(new MouseAdapter() {
                          public void mousePressed(MouseEvent evt) {
                              if (evt.isPopupTrigger()) {
                                  menu.show(evt.getComponent(), evt.getX(), evt.getY());
                              }
                          }
                          public void mouseReleased(MouseEvent evt) {
                              if (evt.isPopupTrigger()) {
                                  menu.show(evt.getComponent(), evt.getX(), evt.getY());
                              }
                          }
                      });
      }

    public static void main(String a[]) {
        new LNTextPane1();
    }
}

class NumberedEditorKit extends StyledEditorKit {
    public ViewFactory getViewFactory() {
        return new NumberedViewFactory();
    }
}

class NumberedViewFactory implements ViewFactory {
    public View create(Element elem) {
        String kind = elem.getName();

        if (kind != null)
            if (kind.equals(AbstractDocument.ContentElementName)) {
                return new LabelView(elem);
            }
            else if (kind.equals(AbstractDocument.
                             ParagraphElementName)) {
//              return new ParagraphView(elem);
                return new NumberedParagraphView(elem);
            }
            else if (kind.equals(AbstractDocument.
                     SectionElementName)) {
                return new BoxView(elem, View.Y_AXIS);
            }
            else if (kind.equals(StyleConstants.
                     ComponentElementName)) {
                return new ComponentView(elem);
            }
            else if (kind.equals(StyleConstants.IconElementName)) {
                return new IconView(elem);
            }
        // default to text display
        return new LabelView(elem);
    }
}

class NumberedParagraphView extends ParagraphView {
    public static short NUMBERS_WIDTH=25;

    public NumberedParagraphView(Element e) {
        super(e);
        short top = 0;
        short left = 0;
        short bottom = 0;
        short right = 0;
        this.setInsets(top, left, bottom, right);
    }

    protected void setInsets(short top, short left, short bottom,
                             short right) {super.setInsets
                             (top,(short)(left+NUMBERS_WIDTH),
                             bottom,right);
    }

    public void paintChild(Graphics g, Rectangle r, int n) {
        super.paintChild(g, r, n);
        int previousLineCount = getPreviousLineCount();
        int numberX = r.x - getLeftInset();
        int numberY = r.y + r.height - 5;
        g.drawString(Integer.toString(previousLineCount + n + 1),
                                      numberX, numberY);
    }

    public int getPreviousLineCount() {
        int lineCount = 0;
        View parent = this.getParent();
        int count = parent.getViewCount();
        for (int i = 0; i < count; i++) {
            if (parent.getView(i) == this) {
                break;
            }
            else {
                lineCount += parent.getView(i).getViewCount();
            }
        }
        return lineCount;
    }
}

class SelectLineNo extends JDialog implements ActionListener{

      JTextField txtField = new JTextField();
      JButton btnOk = new JButton("Ok");
      int lineNumber = 0;

      public SelectLineNo(Dialog dlg, boolean modal){
            btnOk.setName("Ok");
            this.getContentPane().add(txtField, BorderLayout.CENTER);
            this.getContentPane().add(btnOk, BorderLayout.SOUTH);
            btnOk.addActionListener(this);
            this.setTitle("Select Line no.");
            this.setSize(200, 100);
            this.setModal(modal);
        this.show();
      }

      public void actionPerformed(ActionEvent event){
            Object obj = event.getSource();

            if(obj instanceof JButton){
                  if(((JButton)obj).getName().equalsIgnoreCase("Ok")){
                        String str = txtField.getText();

                        if(str != null && ! str.equals("")){
                              try{
                                    lineNumber = Integer.parseInt(str);
                              }catch(Exception ex){
                                    lineNumber = 0;
                              }
                        }
                        this.setVisible(false);
                  }
            }
      }

      int  getLineNumber(){
            return lineNumber;
      }
}

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

import java.util.StringTokenizer;

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


class LNTextPane1 extends JFrame {

    public LNTextPane1() {
        final JEditorPane edit = new JEditorPane();
        edit.setEditorKit(new NumberedEditorKit());

            JMenuBar menuBar = new JMenuBar();

          // Create a menu
            JMenu menu = new JMenu("Goto Line No.");

            JMenuItem item = new JMenuItem("Select Line No.");
            item.addActionListener(new ActionListener(){
                  public void actionPerformed(ActionEvent e){
                              SelectLineNo lineNo = new SelectLineNo(null, true);

                              String str = edit.getText();

                              int tokens = 0;
                              StringTokenizer tokenizer = new StringTokenizer(str,new String("\n"));
                          tokens = tokenizer.countTokens();

                              int count = 0;
                              int count1 = 0;
                              int line = lineNo.getLineNumber() - 1;
                              int lineCount = 0;

                              if(line >= 0){
                                    for(;tokenizer.hasMoreTokens();){
                                          if(lineCount < line)
                                                count += tokenizer.nextToken().length();
                                          else if(lineCount == line){
                                                count1 = count + tokenizer.nextToken().length();
                                                break;
                                          }
                                          lineCount++;
                                    }
                              }
                              edit.setSelectionStart(count);
                              edit.setSelectionEnd(count1);
                              edit.setSelectedTextColor(Color.yellow);
                              edit.setSelectionColor(Color.blue);
                  }
            });
            menu.add(item);
            menuBar.add(menu);
          this.setJMenuBar(menuBar);

            init(edit);

        JScrollPane scroll = new JScrollPane(edit);
        getContentPane().add(scroll);
        setSize(300, 300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }


          private void init(final JEditorPane edit){

                  final JPopupMenu menu = new JPopupMenu();

                      // Create and add a menu item
                      JMenuItem item = new JMenuItem("Select Line No.");
                      item.addActionListener(new ActionListener(){
                              public void actionPerformed(ActionEvent e){

                              SelectLineNo lineNo = new SelectLineNo(null, true);

                              String str = edit.getText();

                              int tokens = 0;
                              StringTokenizer tokenizer = new StringTokenizer(str,new String("\n"));
                          tokens = tokenizer.countTokens();

                              int count = 0;
                              int count1 = 0;
                              int line = lineNo.getLineNumber() - 1;
                              int lineCount = 0;

                              if(line >= 0){
                                    for(;tokenizer.hasMoreTokens();){
                                          if(lineCount < line)
                                                count += tokenizer.nextToken().length();
                                          else if(lineCount == line){
                                                count1 = count + tokenizer.nextToken().length();
                                                break;
                                          }
                                          lineCount++;
                                    }
                              }
                              edit.setSelectionStart(count);
                              edit.setSelectionEnd(count1);
                              edit.setSelectedTextColor(Color.yellow);
                              edit.setSelectionColor(Color.blue);
                              }
                        });
                      menu.add(item);

                      // Set the component to show the popup menu
                      edit.addMouseListener(new MouseAdapter() {
                          public void mousePressed(MouseEvent evt) {
                              if (evt.isPopupTrigger()) {
                                  menu.show(evt.getComponent(), evt.getX(), evt.getY());
                              }
                          }
                          public void mouseReleased(MouseEvent evt) {
                              if (evt.isPopupTrigger()) {
                                  menu.show(evt.getComponent(), evt.getX(), evt.getY());
                              }
                          }
                      });
      }

    public static void main(String a[]) {
        new LNTextPane1();
    }
}

class NumberedEditorKit extends StyledEditorKit {
    public ViewFactory getViewFactory() {
        return new NumberedViewFactory();
    }
}

class NumberedViewFactory implements ViewFactory {
    public View create(Element elem) {
        String kind = elem.getName();

        if (kind != null)
            if (kind.equals(AbstractDocument.ContentElementName)) {
                return new LabelView(elem);
            }
            else if (kind.equals(AbstractDocument.
                             ParagraphElementName)) {
//              return new ParagraphView(elem);
                return new NumberedParagraphView(elem);
            }
            else if (kind.equals(AbstractDocument.
                     SectionElementName)) {
                return new BoxView(elem, View.Y_AXIS);
            }
            else if (kind.equals(StyleConstants.
                     ComponentElementName)) {
                return new ComponentView(elem);
            }
            else if (kind.equals(StyleConstants.IconElementName)) {
                return new IconView(elem);
            }
        // default to text display
        return new LabelView(elem);
    }
}

class NumberedParagraphView extends ParagraphView {
    public static short NUMBERS_WIDTH=25;

    public NumberedParagraphView(Element e) {
        super(e);
        short top = 0;
        short left = 0;
        short bottom = 0;
        short right = 0;
        this.setInsets(top, left, bottom, right);
    }

    protected void setInsets(short top, short left, short bottom,
                             short right) {super.setInsets
                             (top,(short)(left+NUMBERS_WIDTH),
                             bottom,right);
    }

    public void paintChild(Graphics g, Rectangle r, int n) {
        super.paintChild(g, r, n);
        int previousLineCount = getPreviousLineCount();
        int numberX = r.x - getLeftInset();
        int numberY = r.y + r.height - 5;
        g.drawString(Integer.toString(previousLineCount + n + 1),
                                      numberX, numberY);
    }

    public int getPreviousLineCount() {
        int lineCount = 0;
        View parent = this.getParent();
        int count = parent.getViewCount();
        for (int i = 0; i < count; i++) {
            if (parent.getView(i) == this) {
                break;
            }
            else {
                lineCount += parent.getView(i).getViewCount();
            }
        }
        return lineCount;
    }
}

class SelectLineNo extends JDialog implements ActionListener{

      JTextField txtField = new JTextField();
      JButton btnOk = new JButton("Ok");
      int lineNumber = 0;

      public SelectLineNo(Dialog dlg, boolean modal){
            btnOk.setName("Ok");
            this.getContentPane().add(txtField, BorderLayout.CENTER);
            this.getContentPane().add(btnOk, BorderLayout.SOUTH);
            btnOk.addActionListener(this);
            this.setTitle("Select Line no.");
            this.setSize(200, 100);
            this.setModal(modal);
        this.show();
      }

      public void actionPerformed(ActionEvent event){
            Object obj = event.getSource();

            if(obj instanceof JButton){
                  if(((JButton)obj).getName().equalsIgnoreCase("Ok")){
                        String str = txtField.getText();

                        if(str != null && ! str.equals("")){
                              try{
                                    lineNumber = Integer.parseInt(str);
                              }catch(Exception ex){
                                    lineNumber = 0;
                              }
                        }
                        this.setVisible(false);
                  }
            }
      }

      int  getLineNumber(){
            return lineNumber;
      }
}

hey, its not generating line nos although youve copied the same code for NumberedEditorKit
Also you havent come out with the - loadFile(TextPane, File) method which was the main object of this post

PLEASE .. if poss try, Im sure you can

thanks !!!!

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

import java.util.StringTokenizer;

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


class LNTextPane1 extends JFrame {

    public LNTextPane1() {
        final JEditorPane edit = new JEditorPane();
        edit.setEditorKit(new NumberedEditorKit());

            readFile("d:\\RND\\hello.txt", edit);

            JMenuBar menuBar = new JMenuBar();

          // Create a menu
            JMenu menu = new JMenu("Goto Line No.");

            JMenuItem item = new JMenuItem("Select Line No.");
            item.addActionListener(new ActionListener(){
                  public void actionPerformed(ActionEvent e){
                              SelectLineNo lineNo = new SelectLineNo(null, true);

                              String str = edit.getText();

                              int tokens = 0;
                              StringTokenizer tokenizer = new StringTokenizer(str,new String("\n"));
                          tokens = tokenizer.countTokens();

                              int count = 0;
                              int count1 = 0;
                              int line = lineNo.getLineNumber() - 1;
                              int lineCount = 0;

                              if(line >= 0){
                                    for(;tokenizer.hasMoreTokens();){
                                          if(lineCount < line)
                                                count += tokenizer.nextToken().length();
                                          else if(lineCount == line){
                                                count1 = count + tokenizer.nextToken().length();
                                                break;
                                          }
                                          lineCount++;
                                    }
                              }
                              edit.setSelectionStart(count);
                              edit.setSelectionEnd(count1);
                              edit.setSelectedTextColor(Color.yellow);
                              edit.setSelectionColor(Color.blue);
                  }
            });
            menu.add(item);
            menuBar.add(menu);
          this.setJMenuBar(menuBar);

            init(edit);

        JScrollPane scroll = new JScrollPane(edit);
        getContentPane().add(scroll);
        setSize(300, 300);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }


      void readFile(String fileName, JEditorPane edit){
            try {
                  BufferedReader stream = new BufferedReader(new InputStreamReader(new
                                                      FileInputStream(fileName)));
                  String line = null;
                  StringBuffer sb = new StringBuffer();
                  while (null != (line = stream.readLine())) {
                        sb.append(line);
                        sb.append("\n");
                        edit.setText(sb.toString());
                  }
            }catch(Exception ex){
                  ex.printStackTrace();
            }
      }
          private void init(final JEditorPane edit){

                  final JPopupMenu menu = new JPopupMenu();

                      // Create and add a menu item
                      JMenuItem item = new JMenuItem("Select Line No.");
                      item.addActionListener(new ActionListener(){
                              public void actionPerformed(ActionEvent e){

                              SelectLineNo lineNo = new SelectLineNo(null, true);

                              String str = edit.getText();

                              int tokens = 0;
                              StringTokenizer tokenizer = new StringTokenizer(str,new String("\n"));
                          tokens = tokenizer.countTokens();

                              int count = 0;
                              int count1 = 0;
                              int line = lineNo.getLineNumber() - 1;
                              int lineCount = 0;

                              if(line >= 0){
                                    for(;tokenizer.hasMoreTokens();){
                                          if(lineCount < line)
                                                count += tokenizer.nextToken().length();
                                          else if(lineCount == line){
                                                count1 = count + tokenizer.nextToken().length();
                                                break;
                                          }
                                          lineCount++;
                                    }
                              }
                              edit.setSelectionStart(count);
                              edit.setSelectionEnd(count1);
                              edit.setSelectedTextColor(Color.yellow);
                              edit.setSelectionColor(Color.blue);
                              }
                        });
                      menu.add(item);

                      // Set the component to show the popup menu
                      edit.addMouseListener(new MouseAdapter() {
                          public void mousePressed(MouseEvent evt) {
                              if (evt.isPopupTrigger()) {
                                  menu.show(evt.getComponent(), evt.getX(), evt.getY());
                              }
                          }
                          public void mouseReleased(MouseEvent evt) {
                              if (evt.isPopupTrigger()) {
                                  menu.show(evt.getComponent(), evt.getX(), evt.getY());
                              }
                          }
                      });
      }

    public static void main(String a[]) {
        new LNTextPane1();
    }
}

class NumberedEditorKit extends StyledEditorKit {
    public ViewFactory getViewFactory() {
        return new NumberedViewFactory();
    }
}

class NumberedViewFactory implements ViewFactory {
    public View create(Element elem) {
        String kind = elem.getName();

        if (kind != null)
            if (kind.equals(AbstractDocument.ContentElementName)) {
                return new LabelView(elem);
            }
            else if (kind.equals(AbstractDocument.
                             ParagraphElementName)) {
//              return new ParagraphView(elem);
                return new NumberedParagraphView(elem);
            }
            else if (kind.equals(AbstractDocument.
                     SectionElementName)) {
                return new BoxView(elem, View.Y_AXIS);
            }
            else if (kind.equals(StyleConstants.
                     ComponentElementName)) {
                return new ComponentView(elem);
            }
            else if (kind.equals(StyleConstants.IconElementName)) {
                return new IconView(elem);
            }
        // default to text display
        return new LabelView(elem);
    }
}

class NumberedParagraphView extends ParagraphView {
    public static short NUMBERS_WIDTH=25;

    public NumberedParagraphView(Element e) {
        super(e);
        short top = 0;
        short left = 0;
        short bottom = 0;
        short right = 0;
        this.setInsets(top, left, bottom, right);
    }

    protected void setInsets(short top, short left, short bottom,
                             short right) {super.setInsets
                             (top,(short)(left+NUMBERS_WIDTH),
                             bottom,right);
    }

    public void paintChild(Graphics g, Rectangle r, int n) {
        super.paintChild(g, r, n);
        int previousLineCount = getPreviousLineCount();
        int numberX = r.x - getLeftInset();
        int numberY = r.y + r.height - 5;
        g.drawString(Integer.toString(previousLineCount + n + 1),
                                      numberX, numberY);
    }

    public int getPreviousLineCount() {
        int lineCount = 0;
        View parent = this.getParent();
        int count = parent.getViewCount();
        for (int i = 0; i < count; i++) {
            if (parent.getView(i) == this) {
                break;
            }
            else {
                lineCount += parent.getView(i).getViewCount();
            }
        }
        return lineCount;
    }
}

class SelectLineNo extends JDialog implements ActionListener{

      JTextField txtField = new JTextField();
      JButton btnOk = new JButton("Ok");
      int lineNumber = 0;

      public SelectLineNo(Dialog dlg, boolean modal){
            btnOk.setName("Ok");
            this.getContentPane().add(txtField, BorderLayout.CENTER);
            this.getContentPane().add(btnOk, BorderLayout.SOUTH);
            btnOk.addActionListener(this);
            this.setTitle("Select Line no.");
            this.setSize(200, 100);
            this.setModal(modal);
        this.show();
      }

      public void actionPerformed(ActionEvent event){
            Object obj = event.getSource();

            if(obj instanceof JButton){
                  if(((JButton)obj).getName().equalsIgnoreCase("Ok")){
                        String str = txtField.getText();

                        if(str != null && ! str.equals("")){
                              try{
                                    lineNumber = Integer.parseInt(str);
                              }catch(Exception ex){
                                    lineNumber = 0;
                              }
                        }
                        this.setVisible(false);
                  }
            }
      }

      int  getLineNumber(){
            return lineNumber;
      }
}

it still doesnt work, even Ive tried the same before hence the repeated requests !!

I think the ViewFactory's create method overrides everything in the EditorKit , inspite of initialising the editor pane with a text file.

Any solutions to get over this??

you have to load the file after this call - edit.setEditorKit(new NumberedEditorKit());

& it works !!!!

do you see anyother problem with code.

wait, your code still doesnt work., im trying on a merged version of  LnTextPane wherein the above call works.
So my loadFile(textPane, file) works .. i guess if i modularise & remove your text pane it should work on my code too.

lemme confirm ...

thanks again!!

working !!!!!!!!! you're a genius :)
mind giving your mail id for some personal praises !!!!

i will post the final modularised code & approve your answer!

please give your mail id.

mpriyatam@yahoo.co.in

Ok.. the final version of the supposedly 'EditorPane wiht generated Line nos with Line highlighting' is

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
import java.util.StringTokenizer;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;


class LineEditor extends JEditorPane
{
          
    public LineEditor()
    {
          setEditorKit(new NumberedEditorKit());                 
    }

       public void readFile(String fileName)
       {
      try {
           BufferedReader stream = new BufferedReader
                       (new InputStreamReader(new FileInputStream(fileName)));
           String line = null;
           StringBuffer sb = new StringBuffer();
           while (null != (line = stream.readLine()))
           {
                sb.append(line);
                sb.append("\n");
                setText(sb.toString());
           }
      }catch(Exception ex)
      {
           ex.printStackTrace();
      }
       }
     
     public void gotoLine(int lne)
     {
           String str = getText();

        int tokens = 0;
        StringTokenizer tokenizer =
              new StringTokenizer(str,new String("\n"));
        tokens = tokenizer.countTokens();

        int count = 0;
        int count1 = 0;
        int line = lne - 1;
        int lineCount = 0;

        if(tokens < line)
                  setSelectedTextColor(Color.black);

        if(line >= 0)
        {
             for(;tokenizer.hasMoreTokens();)
             {
                  String str1 = tokenizer.nextToken();
                  if(lineCount < line)
                       count += str1.length();
                  else if(lineCount == line)
                  {
                       count1 = count + str1.length();
                       break;
                  }
                  lineCount++;
             }
        }

        setSelectionStart(count+line);
        setSelectionEnd(count1+line+1);    
        setSelectionColor(Color.red);              
     }      
}

class NumberedEditorKit extends StyledEditorKit {
    public ViewFactory getViewFactory() {
        return new NumberedViewFactory();
    }
}

class NumberedViewFactory implements ViewFactory {
    public View create(Element elem) {
        String kind = elem.getName();

        if (kind != null)
            if (kind.equals(AbstractDocument.ContentElementName)) {
                return new LabelView(elem);
            }
            else if (kind.equals(AbstractDocument.
                             ParagraphElementName)) {
//              return new ParagraphView(elem);
                return new NumberedParagraphView(elem);
            }
            else if (kind.equals(AbstractDocument.
                     SectionElementName)) {
                return new BoxView(elem, View.Y_AXIS);
            }
            else if (kind.equals(StyleConstants.
                     ComponentElementName)) {
                return new ComponentView(elem);
            }
            else if (kind.equals(StyleConstants.IconElementName)) {
                return new IconView(elem);
            }
        // default to text display
        return new LabelView(elem);
    }
}

class NumberedParagraphView extends ParagraphView {
    public static short NUMBERS_WIDTH=25;

    public NumberedParagraphView(Element e) {
        super(e);
        short top = 0;
        short left = 0;
        short bottom = 0;
        short right = 0;
        this.setInsets(top, left, bottom, right);
    }

    protected void setInsets(short top, short left, short bottom,
                             short right) {super.setInsets
                             (top,(short)(left+NUMBERS_WIDTH),
                             bottom,right);
    }

    public void paintChild(Graphics g, Rectangle r, int n) {
        super.paintChild(g, r, n);
        int previousLineCount = getPreviousLineCount();
        int numberX = r.x - getLeftInset();
        int numberY = r.y + r.height - 5;
        g.drawString(Integer.toString(previousLineCount + n + 1),
                                      numberX, numberY);
    }

    public int getPreviousLineCount() {
        int lineCount = 0;
        View parent = this.getParent();
        int count = parent.getViewCount();
        for (int i = 0; i < count; i++) {
            if (parent.getView(i) == this) {
                break;
            }
            else {
                lineCount += parent.getView(i).getViewCount();
            }
        }
        return lineCount;
    }
}


Usage -
call readFile(String) to load a file to the JEditorPane
call gotoLine(int) to goto a particular line in the editor.