NextVisualPositionAction(String nm,
    boolean select,
    int direction) 
{
            super(nm);
            this.select = select;
            this.direction = direction;
}

Create this action with the appropriate identifier.

Parameters:

nm - the name of the action, Action.NAME.

select - whether to extend the selection when changing the caret position.

 public  void actionPerformed(ActionEvent e) 
{
            JTextComponent target = getTextComponent(e);
            if (target != null) {
                Caret caret = target.getCaret();
                DefaultCaret bidiCaret = (caret instanceof DefaultCaret) ?
                                              (DefaultCaret)caret : null;
                int dot = caret.getDot();
                Position.Bias[] bias = new Position.Bias[1];
                Point magicPosition = caret.getMagicCaretPosition();
                try {
                    if(magicPosition == null &&
                       (direction == SwingConstants.NORTH ||
                        direction == SwingConstants.SOUTH)) {
                        Rectangle r = (bidiCaret != null) ?
                                target.getUI().modelToView(target, dot,
                                                      bidiCaret.getDotBias()) :
                                target.modelToView(dot);
                        magicPosition = new Point(r.x, r.y);
                    }
                    NavigationFilter filter = target.getNavigationFilter();
                    if (filter != null) {
                        dot = filter.getNextVisualPositionFrom
                                     (target, dot, (bidiCaret != null) ?
                                      bidiCaret.getDotBias() :
                                      Position.Bias.Forward, direction, bias);
                    }
                    else {
                        dot = target.getUI().getNextVisualPositionFrom
                                     (target, dot, (bidiCaret != null) ?
                                      bidiCaret.getDotBias() :
                                      Position.Bias.Forward, direction, bias);
                    }
                    if(bias[0] == null) {
                        bias[0] = Position.Bias.Forward;
                    }
                    if(bidiCaret != null) {
                        if (select) {
                            bidiCaret.moveDot(dot, bias[0]);
                        } else {
                            bidiCaret.setDot(dot, bias[0]);
                        }
                    }
                    else {
                        if (select) {
                            caret.moveDot(dot);
                        } else {
                            caret.setDot(dot);
                        }
                    }
                    if(magicPosition != null &&
                       (direction == SwingConstants.NORTH ||
                        direction == SwingConstants.SOUTH)) {
                        target.getCaret().setMagicCaretPosition(magicPosition);
                    }
                } catch (BadLocationException ex) {
                }
            }
}

The operation to perform when this action is triggered.