\ mini-oof example

\ Authors: Anton Ertl, Bernd Paysan
\ Copyright (C) 1998,2003,2007,2019,2022 Free Software Foundation, Inc.

\ This file is part of Gforth.

\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation, either version 3
\ of the License, or (at your option) any later version.

\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
\ GNU General Public License for more details.

\ You should have received a copy of the GNU General Public License
\ along with this program. If not, see http://www.gnu.org/licenses/.

\ usage:

object class
  cell var text
  cell var len
  cell var x
  cell var y
  method init
  method draw
end-class button

:noname ( o -- ) dup
 >r x @ r@ y @ at-xy  r@ text @ r> len @ type ;
 button defines draw
:noname ( addr u o -- ) >r
 0 r@ x ! 0 r@ y ! r@ len ! r> text ! ;
 button defines init

\ interitance

: bold   27 emit ." [1m" ;
: normal 27 emit ." [0m" ;

button class end-class bold-button
:noname bold [ button :: draw ] normal ; bold-button defines draw

\ Create and draw a button:

button new Constant foo
s" thin foo" foo init
page
foo draw
bold-button new Constant bar
s" fat bar" bar init
1 bar y !
bar draw
