Adding something to beginning of JTextArea

[Huskies]

Hey guys, i have a questions...

1: Is there a way to add something to the beginning of each line in a JTextArea? I am making a notepad like application, and i would like to add something like in notepad++, where it displays what line you are on. I'd like it to work just like notepad++ where it doesn't display the number of rows not used yet.

If that doesn't make sense i can try and clarify. Thanks in advance!

-Huskies

[milovan]

with JTextArea you can only add numbers or other kind of marks at the beginning of lines.
simpliest way:

for determining number of lines -

jTextArea.getLineCount()

getting number of columns -

jTextArea.getColumns()

calculate position in text to insert line numbers

inserting text -

jTextArea.insert(String lineNumber, int position)

consider using JEditorPane or JTextPane instead
take a look:
How to Use Editor Panes and Text Panes (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)

[sunde887]

With some googling you can probably find examples of what you are looking for. Like Milovan said, you will need to switch to JTextPane(which adds more power to the editor).

[Huskies]

will do! thanks for the input

[Huskies]

Having played around with the JTextPane, i am still confused. in the following code, i want to put the symbol ">>" in front of every line that is typed. I am trying to use a key listener, which probably isn't the best way, but i figured it was a good time to learn. here is my code:

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

public class TextPaneTest {

    JTextPane text;
    
    public static void main(String[] args) {
        TextPaneTest test = new TextPaneTest();
        test.makeWindow();
    }
    
    private void makeWindow(){
        JFrame frame = new JFrame("Text Pane v1.0");
        frame.setSize(600,300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        
        text = new JTextPane();
        text.setFont(new Font("Lucida Console", Font.BOLD, 18));
        
        text.setText(">>");
        
        text.addKeyListener(new EnterKeyPressed());
        JScrollPane scroll = new JScrollPane(text);
        
        frame.getContentPane().add(BorderLayout.CENTER, scroll);
        frame.setVisible(true);
    }
    
    private void enter(String s, AttributeSet att){
        Document d = text.getDocument();
        int position = text.getCaretPosition();
        try{d.insertString(position,s,att);}
        catch(BadLocationException ble){}
    }
    
    private class EnterKeyPressed implements KeyListener{

        @Override
        public void keyTyped(KeyEvent e) {
        }

        @Override
        public void keyPressed(KeyEvent e) {
            int keyCode = e.getKeyCode();
            if(keyCode == KeyEvent.VK_ENTER){
                enter("\n>>",null);
            }
        }

        @Override
        public void keyReleased(KeyEvent e) {
        }
    
    }
}

i have 2 questions:

1: when i run the application, the cursor automatically starts behind the first ">>". How can i get it to go in front of it

2: when i click enter, this is what the text looks like (i know its a code box, but pretend its the textPane)

>>blah
>>
blah

i hope that made sense. if not, i can clarify.