Underlining a digit in jFormatted Text Field

Question

Let me rephrase a question a I asked yesterday now that I've learned more..
I want to allow the user to click on a digit in a FormattedTextField and have that digit underlined. (buttons then inc or dec the digit value). I tried changing the default Caret to do this. It does create an underline, but I realize now when you click in the field it finds the closest space between characters, not the closest character. So the cursor will go to different places if you click on the right verses the left half of a digit. Can I modify this behavoir or should I be using something else?
I am new at Java, so I could be missing something very basic.

Answer 1

Using my example code above I overrode the following method of the DefaultCaret and it seems to work:
* Tries to set the position of the caret from
* the coordinates of a mouse event, using viewToModel().
* @param e the mouse event
protected void positionCaret(MouseEvent e)
     JTextComponent component = (JTextComponent)e.getComponent();
     Point pt = new Point(e.getX(), e.getY());
     Position.Bias[] biasRet = new Position.Bias[1];
     int pos = component.getUI().viewToModel(component, pt, biasRet);
     try
          Rectangle view = component.modelToView( pos );
          if (view.x > e.getX())
               pos--;
               view = component.modelToView( pos );
          MouseEvent me = new MouseEvent(
               e.getComponent(),
               e.getID(),
               e.getWhen(),
               e.getModifiers(),
               view.x,
               e.getY(),
               e.getClickCount(),
               e.isPopupTrigger());
          super.positionCaret( me );
     catch(Exception ble)
          super.positionCaret( e );
}The code is based on your concept of comparing the proposed caret position with the mouse clicked position. When the caret position is greater than the mouse we move the caret back one position.