stk/STklos/Tk/Font.stklos

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1999-09-05 07:16:41 -04:00
;;;; Font.stklos -- The Font Class
;;;;
;;;; Copyright <20> 1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;;
;;;; Permission to use, copy, modify, distribute,and license this
;;;; software and its documentation for any purpose is hereby granted,
;;;; provided that existing copyright notices are retained in all
;;;; copies and that this notice is included verbatim in any
;;;; distributions. No written agreement, license, or royalty fee is
;;;; required for any of the authorized uses.
;;;; This software is provided ``AS IS'' without express or implied
;;;; warranty.
;;;;
;;;; Author: Erick Gallesio [eg@unice.fr]
;;;; Creation date: 18-May-1999 13:24
;;;; Last file update: 3-Sep-1999 20:10 (eg)
(require "Basics")
(select-module STklos+Tk)
;=============================================================================
;
; <Font> class definition
;
;=============================================================================
(define-class <Font> ()
((Id)
(family :accessor family
:allocation :tk-virtual
:init-keyword :family)
(size :accessor size
:allocation :tk-virtual
:init-keyword :size)
(weight :accessor weight
:allocation :tk-virtual
:init-keyword :weight)
(slant :accessor slant
:allocation :tk-virtual
:init-keyword :slant)
(underline :accessor underline
:allocation :tk-virtual
:init-keyword :underline)
(overstrike :accessor overstrike
:allocation :tk-virtual
:init-keyword :overstrike)
;; Special virtual slot "value"
(value :accessor value
:allocation :virtual
:init-keyword :value
:slot-ref (lambda (o)
(let ((id (slot-ref o 'id))
(font (with-module Tk font)))
(append
(list (font 'conf id :family)
(font 'conf id :size)
(string->symbol (font 'conf id :weight))
(string->symbol (font 'conf id :slant)))
(if (font 'conf id :underline)
'(underline)
'())
(if (font 'conf id :overstrike)
'(overstrike)
'()))))
:slot-set! (lambda (o v)
(let ((id (slot-ref o 'id))
(font (with-module Tk font)))
(apply font 'configure id (font 'actual v))))))
:metaclass <Tk-font-metaclass>)
(define-method initialize ((self <Font>) initargs)
(let ((Id (gensym "font"))
(font (with-module Tk font)))
(font 'create Id)
(slot-set! self 'Id Id)
(next-method)))
;=============================================================================
;
; a special Tk-write-object for communicating fonts to Tk
;
;=============================================================================
(define-method Tk-write-object((self <Font>) port)
(write (slot-ref self 'id) port))
(provide "Font")
#|
Example:
(define f (make <Font> :family "helvetica" :size 48))
(define b (make <Button> :text "foo" :font f))
(pack b)
(after 3000 (lambda () (slot-set! f 'value "fixed")))
#|