cocoa - NSTextView Subclass - A4 Paper Look -

I'm thinking about modifying my NSTextView so that it looks like A4 sheet. So basically a line drawn around the text container, but I do not know how this can be done ...

Just when nobody can understand what I mean, I A screenshot is attached: P

thanks :)

If you are likely to have multiple pages, take a look at TextEdit (Format → wrap to page). Source code / developer / example / text edit /.