JTextPane, user input character in different colors

Question

Hi,
I have a class ColorPane extends JTextPane.
I want to control the user input on the pane in the way of having a "change tracking" functionality.
So when a user inserts text, it must be colored green. If the user deletes an existing character it must be colored red instead of really deleted.
But I'm struggling with this.
e.g. I've added a keyListener: addKeyListener(new KeyAdapter() {
     public void keyPressed(KeyEvent e) {
                  switch (e.getKeyCode()) {
                       case KeyEvent.VK_BACK_SPACE:
                            if (getCaretPosition() > 0){
                                 changeColor(Color.RED);
                                 String value = getText().substring(getCaretPosition()-1, getCaretPosition());
                                 e.setKeyCode((int)value.toUpperCase().charAt(0));
                                 break;
     public void keyReleased(KeyEvent e) {
                  switch (e.getKeyCode()) {
                       case KeyEvent.VK_BACK_SPACE:
                            setCaretPosition(getCaretPosition() - 1);
                            break;
}But I can't get the deleted character to be colored red.
Also, if this coding is not the good approach, you can advice me if you want.
Best regards,
Tim
Message was edited by:
timvissers

Answer 1

Okay, I found out about extending DefaultStyledDocument.
But now I'm having the following problem: when removing by using the backspace button, my cursor should move to the left.
See code:
As you see, instead of removing, I put it in red. Side-effect is that the cursor is not moved when using backspace. Does someone know how to do this?
public void remove(int offset, int length) throws BadLocationException {
          // super.remove(offset, length);//DO NOT REMOVE
          doc.setCharacterAttributes(offset, length, red, true);// PUT IN RED!!
          //if backspace set caret length to the left
          //   textPane.setCaretPosition(textPane.getCaretPosition()-length);
          //else
          //   do nothing