mdw@git.distorted.org.uk Git - clg/blob - glib/gboxed.lisp

   1 ;; Common Lisp bindings for GTK+ v2.0
   2 ;; Copyright (C) 2001 Espen S. Johnsen <esj@stud.cs.uit.no>
   3 ;;
   4 ;; This library is free software; you can redistribute it and/or
   5 ;; modify it under the terms of the GNU Lesser General Public
   6 ;; License as published by the Free Software Foundation; either
   7 ;; version 2 of the License, or (at your option) any later version.
   8 ;;
   9 ;; This library is distributed in the hope that it will be useful,
  10 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 ;; Lesser General Public License for more details.
  13 ;;
  14 ;; You should have received a copy of the GNU Lesser General Public
  15 ;; License along with this library; if not, write to the Free Software
  16 ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17
  18 ;; $Id: gboxed.lisp,v 1.18 2005-03-11 10:56:58 espen Exp $
  19
  20 (in-package "GLIB")
  21
  22
  23 (defclass boxed (struct)
  24   ()
  25   (:metaclass struct-class))
  26
  27 (defmethod instance-finalizer ((instance boxed))
  28   (let ((location (proxy-location instance))
  29         (type-number (type-number-of instance)))
  30     #'(lambda ()
  31         (remove-cached-instance location)
  32         (%boxed-free type-number location))))
  33
  34
  35 ;;;; Metaclass for boxed classes
  36
  37 (eval-when (:compile-toplevel :load-toplevel :execute)
  38   (defclass boxed-class (struct-class)
  39     ())
  40
  41   (defmethod validate-superclass ((class boxed-class) (super standard-class))
  42     (subtypep (class-name super) 'boxed)))
  43
  44
  45 (defmethod shared-initialize ((class boxed-class) names &key name gtype)
  46   (declare (ignore names))
  47   (call-next-method)
  48   (let ((class-name (or name (class-name class))))
  49     (unless (find-type-number class-name)
  50       (register-type class-name
  51        (or (first gtype) (default-type-init-name class-name))))))
  52
  53 (defbinding %boxed-copy () pointer
  54   (type-number type-number)
  55   (location pointer))
  56
  57 (defbinding %boxed-free () nil
  58   (type-number type-number)
  59   (location pointer))
  60
  61 (defmethod reference-foreign ((class boxed-class) location)
  62   (%boxed-copy (find-type-number class) location))
  63
  64 (defmethod unreference-foreign ((class boxed-class) location)
  65   (%boxed-free (find-type-number class) location))
  66
  67
  68 ;;;;
  69
  70 (defun expand-boxed-type (type-number forward-p slots)
  71   `(defclass ,(type-from-number type-number) (boxed)
  72      ,(unless forward-p
  73         slots)
  74      (:metaclass boxed-class)
  75      (:gtype ,(register-type-as type-number))))
  76
  77 (register-derivable-type 'boxed "GBoxed" 'expand-boxed-type)
  78
  79 ;;;; Special boxed types
  80
  81 ;; (defclass gstring (boxed)
  82 ;;   ()
  83 ;;   (:metaclass boxed-class)
  84 ;;   (:alien-name "GString"))
  85
  86 ;; (deftype-method translate-from-alien
  87 ;;     gstring (type-spec location &optional weak-ref)
  88 ;;   `(let ((location ,location))
  89 ;;      (unless (null-pointer-p location)
  90 ;;        (prog1
  91 ;;         (c-call::%naturalize-c-string location)
  92 ;;       ,(unless weak-ref
  93 ;;          (unreference-alien type-spec location))))))
  94
  95 ;; (deftype-method translate-to-alien
  96 ;;     gstring (type-spec string &optional weak-ref)
  97 ;;   (declare (ignore weak-ref))
  98 ;;   `(let ((string ,string))
  99 ;;      ;; Always copy strings to prevent seg fault due to GC
 100 ;;      (funcall
 101 ;;       ',(proxy-class-copy (find-class type-spec))
 102 ;;       ',type-spec
 103 ;;       (make-pointer (1+ (kernel:get-lisp-obj-address string))))))
 104
 105 ;; (deftype-method cleanup-alien gstring (type-spec c-string &optional weak-ref)
 106 ;;   (when weak-ref
 107 ;;     (unreference-alien type-spec c-string)))
 108
 109
 110
 111 ;;;; NULL terminated vector of strings
 112
 113 (deftype strings () '(null-terminated-vector string))
 114 (register-type 'strings '|g_strv_get_type|)