How to update caret position in status bar ?

Question

Hello, I'm trying to display 'Line Number & Position' in my status bar, I'm not sure how to proceed from here.
How would I update this to occur on every keystroke?
SSCCE
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.KeyEvent;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.border.EtchedBorder;
import javax.swing.text.BadLocationException;
import javax.swing.text.Element;
import javax.swing.text.Utilities;
public class test extends JFrame
     private static final long serialVersionUID = 1L;
     private JTextPane pane;
     @SuppressWarnings("unused")
     public static void main(String[] args)
          test t = new test();
     public test()
          super("test");
          this.setDefaultCloseOperation(EXIT_ON_CLOSE);
          this.setLayout(new BorderLayout());
          this.add(textPane(), BorderLayout.CENTER);
          this.add(statusBar(), BorderLayout.SOUTH);
          this.pack();
          this.setVisible(true);
     private JTabbedPane textPane()
          pane = new JTextPane();
          JTabbedPane tab = new JTabbedPane();
          tab.addTab("  Query  ", null, pane, "Query");
          tab.setMnemonicAt(0, KeyEvent.VK_1);
          return tab;
     private Box statusBar()
          Box sBar = Box.createHorizontalBox();
          JTextField linePosField = new JTextField(15);
          linePosField.setBackground(Color.LIGHT_GRAY);
          linePosField.setEditable(false);
          linePosField.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.RAISED));
          linePosField.setText(String.format("%s %d %s %d", "Line:",
                    getCaretRowPosition(pane), "Pos:",
                    getCaretColumnPosition(pane)));
          sBar.add(linePosField);
          return sBar;
      * Return the current line number at the Caret position.
     public int getCaretRowPosition(JTextPane textPane)
          int caretPosition = textPane.getCaretPosition();
          Element root = textPane.getDocument().getDefaultRootElement();
          return root.getElementIndex( caretPosition ) + 1;
      * Return the current Caret position.
     public int getCaretColumnPosition(JTextPane textPane)
          int offset = textPane.getCaretPosition();
          int column;
          try {
               column = offset - Utilities.getRowStart(textPane, offset);
          } catch (BadLocationException e) {
               column = -1;
          return column;
}Edited by: G-Unit on Oct 17, 2010 4:08 AM

Answer 1

Sorry, Found CaretListener(): Updated code;
private JTabbedPane textPane()
   pane = new JTextPane();
   pane.addCaretListener(new CaretListener() {
      public void caretUpdate(CaretEvent e)
         linePosField.setText(String.format("%s %d %s %d", "Line:",
            getCaretRowPosition(pane), "Pos:",
            getCaretColumnPosition(pane)));
   JTabbedPane tab = new JTabbedPane();
   tab.addTab("  Query  ", null, pane, "Query");
   tab.setMnemonicAt(0, KeyEvent.VK_1);
   return tab;
}Now I just have to figure out how to add a panel for line number to sit adjacent to my text area without throwing the whole window out of proportion. I tried adding some context menu buttons to sit next to it, and for some reason they seemed to want to grow by 500x the size specified and destroyed the whole look of the app. :s maybe I will just make do with status bar line numbers.
Edited by: G-Unit on Oct 17, 2010 4:35 AM