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    1: \ mini-oof example
    2: 
    3: \ Copyright (C) 1998,2003,2007 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation, either version 3
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program. If not, see http://www.gnu.org/licenses/.
   19: 
   20: \ usage:
   21: 
   22: object class
   23:   cell var text
   24:   cell var len
   25:   cell var x
   26:   cell var y
   27:   method init
   28:   method draw
   29: end-class button
   30: 
   31: :noname ( o -- ) >r
   32:  r@ x @ r@ y @ at-xy  r@ text @ r> len @ type ;
   33:  button defines draw
   34: :noname ( addr u o -- ) >r
   35:  0 r@ x ! 0 r@ y ! r@ len ! r> text ! ;
   36:  button defines init
   37: 
   38: \ interitance
   39: 
   40: : bold   27 emit ." [1m" ;
   41: : normal 27 emit ." [0m" ;
   42: 
   43: button class end-class bold-button
   44: :noname bold [ button :: draw ] normal ; bold-button defines draw
   45: 
   46: \ Create and draw a button:
   47: 
   48: button new Constant foo
   49: s" thin foo" foo init
   50: page
   51: foo draw
   52: bold-button new Constant bar
   53: s" fat bar" bar init
   54: 1 bar y !
   55: bar draw