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 1.13 2004-11-09 10:10:59 espen Exp $
  19
  20 (in-package "GLIB")
  21
  22
  23 (eval-when (:compile-toplevel :load-toplevel :execute)
  24   (init-types-in-library #.(concatenate 'string
  25                           (pkg-config:pkg-variable "glib-2.0" "libdir")
  26                           "/libgobject-2.0.so")))
  27
  28 (defclass boxed (struct)
  29   ()
  30   (:metaclass struct-class))
  31
  32 (defmethod instance-finalizer ((instance boxed))
  33   (let ((location (proxy-location instance))
  34         (type-number (type-number-of instance)))
  35     #'(lambda ()
  36         (remove-cached-instance location)
  37         (%boxed-free type-number location))))
  38
  39
  40 ;;;; Metaclass for boxed classes
  41
  42 (eval-when (:compile-toplevel :load-toplevel :execute)
  43   (defclass boxed-class (struct-class)
  44     ())
  45
  46   (defmethod validate-superclass ((class boxed-class) (super standard-class))
  47     (subtypep (class-name super) 'boxed)))
  48
  49
  50 (defmethod shared-initialize ((class boxed-class) names
  51                               &rest initargs &key name alien-name)
  52   (declare (ignore initargs names))
  53   (call-next-method)
  54
  55   (let* ((class-name (or name (class-name class)))
  56          (type-number
  57           (find-type-number
  58            (or (first alien-name) (default-alien-type-name class-name)))))
  59     (register-type class-name type-number)))
  60
  61
  62 (defbinding %boxed-copy () pointer
  63   (type-number type-number)
  64   (location pointer))
  65
  66 (defbinding %boxed-free () nil
  67   (type-number type-number)
  68   (location pointer))
  69
  70 (defmethod reference-foreign ((class boxed-class) location)
  71   (%boxed-copy (find-type-number class) location))
  72
  73 (defmethod unreference-foreign ((class boxed-class) location)
  74   (%boxed-free (find-type-number class) location))
  75
  76
  77 ;;;;
  78
  79 (defun expand-boxed-type (type-number &optional slots)
  80   `(defclass ,(type-from-number type-number) (boxed)
  81      ,slots
  82      (:metaclass boxed-class)
  83      (:alien-name ,(find-type-name type-number))))
  84
  85 (register-derivable-type 'boxed "GBoxed" 'expand-boxed-type)
  86
  87 ;;;; Special boxed types
  88
  89 ;; (defclass gstring (boxed)
  90 ;;   ()
  91 ;;   (:metaclass boxed-class)
  92 ;;   (:alien-name "GString"))
  93
  94 ;; (deftype-method translate-from-alien
  95 ;;     gstring (type-spec location &optional weak-ref)
  96 ;;   `(let ((location ,location))
  97 ;;      (unless (null-pointer-p location)
  98 ;;        (prog1
  99 ;;         (c-call::%naturalize-c-string location)
 100 ;;       ,(unless weak-ref
 101 ;;          (unreference-alien type-spec location))))))
 102
 103 ;; (deftype-method translate-to-alien
 104 ;;     gstring (type-spec string &optional weak-ref)
 105 ;;   (declare (ignore weak-ref))
 106 ;;   `(let ((string ,string))
 107 ;;      ;; Always copy strings to prevent seg fault due to GC
 108 ;;      (funcall
 109 ;;       ',(proxy-class-copy (find-class type-spec))
 110 ;;       ',type-spec
 111 ;;       (make-pointer (1+ (kernel:get-lisp-obj-address string))))))
 112
 113 ;; (deftype-method cleanup-alien gstring (type-spec c-string &optional weak-ref)
 114 ;;   (when weak-ref
 115 ;;     (unreference-alien type-spec c-string)))
 116