show line numbers in JTextArea

If I were going to create a web site for the sole purpose of calling people morons, I would at least make sure it worked without displaying a bunch of error messages. But maybe he's just proving his qualifications to call other people stupid, based on the theory that it takes one to know one.

uncle_alicea at 2007-7-9 21:36:16 >

Don't panic. it's easy. That page gives two solutions.

Here is how to use the second, LineNumberBorder:

import javax.swing.*;

public class UsingLineNumberBorder {

public static void main(String[] args) {

JTextArea area = new JTextArea(40,60);

//HERE IT COMES

area.setBorder(new LineNumberedBorder(

LineNumberedBorder.LEFT_SIDE,

LineNumberedBorder.LEFT_JUSTIFY));

//THAT'S IT!

JFrame f = new JFrame("UsingLineNumberBorder");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(new JScrollPane(area));

f.setSize(400,300);

f.setLocationRelativeTo(null);

f.setVisible(true);

}

}

DrLaszloJamfa at 2007-7-9 21:36:16 >

here you go, sorry it took a while:

import java.io.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

import javax.swing.undo.*;

import javax.swing.text.*;

import java.util.*;

class Problem extends JFrame

{

final JTabbedPane jtp = new JTabbedPane();

final JScrollPane scrollPane;

public Problem()

{

super("TextED");

JTextArea textArea = new JTextArea(10, 10);

textArea.setBorder(new LineNumberedBorder(LineNumberedBorder.LEFT_SIDE, LineNumberedBorder.LEFT_JUSTIFY));

textArea.setLineWrap(true);

textArea.setWrapStyleWord(true);

scrollPane = new JScrollPane(textArea);

jtp.addTab("Untitled", scrollPane);

getContentPane().add(jtp);

}

public static void main ( String[] args )

{

Problem frm = new Problem();

frm.setSize( 560, 420 );

frm.setVisible( true );

}

}

boblettoj99a at 2007-7-9 21:36:16 >

ok this shows my problem:

http://i41.photobucket.com/albums/e254/frahasio/screenie.jpg

And here is the code for each actionlistener(you'll understand once you've looked at the picture)

NEW:

fileNewMenuItem.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

JTextArea textArea = new JTextArea(1, 10);

textArea.setBorder(new LineNumberedBorder(LineNumberedBorder.LEFT_SIDE, LineNumberedBorder.LEFT_JUSTIFY));

textArea.setLineWrap(true);

textArea.setWrapStyleWord(true);

textAreas.add(textArea);

JScrollPane newScrollPane = new JScrollPane(textArea);

int index = jtp.getTabCount();

jtp.addTab("Untitled " + (index + 1), newScrollPane);

jtp.setSelectedIndex(index);

getContentPane().add(jtp);

}

});

OPEN (only the relevant bit):

JTextArea textArea = new JTextArea(1, 10);

textArea.setBorder(new LineNumberedBorder(LineNumberedBorder.LEFT_SIDE, LineNumberedBorder.LEFT_JUSTIFY));

textArea.setLineWrap(true);

textArea.setWrapStyleWord(true);

textArea.setText(input);

textAreas.add(textArea);

JScrollPane newScrollPane = new JScrollPane(textArea);

jtp.addTab(title, newScrollPane);

int index = jtp.getTabCount();

jtp.setSelectedIndex(index - 1);

contents.add(jtp);

boblettoj99a at 2007-7-9 21:36:18 >

Here's my 30 second take on your code. It's 24 lines long, sopping wet, and it works:import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class UsingLineNumberBorder {

public static void main(String[] args) {

final JTabbedPane tabbed = new JTabbedPane();

JButton btn = new JButton("new");

btn.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent evt) {

JTextArea area = new JTextArea(40,60);

area.setBorder(new LineNumberedBorder(

LineNumberedBorder.LEFT_SIDE, LineNumberedBorder.LEFT_JUSTIFY));

tabbed.addTab("...", new JScrollPane(area));

}

});

JFrame f = new JFrame("UsingLineNumberBorder");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

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

f.getContentPane().add(btn, BorderLayout.SOUTH);

f.setSize(800,600);

f.setVisible(true);

}

}

Could you at least edit this to demonstrate your problem?

DrLaszloJamfa at 2007-7-9 21:36:18 >