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 1.2 2001-04-30 11:25:25 espen Exp $
  19
  20 (in-package "GLIB")
  21
  22
  23 (eval-when (:compile-toplevel :load-toplevel :execute)
  24   (defclass boxed (proxy)
  25     ()
  26     (:metaclass proxy-class)))
  27
  28 (defmethod initialize-proxy ((boxed boxed) &rest initargs
  29                              &key location weak-ref)
  30   (declare (ignore initargs))
  31   (setf
  32    (slot-value boxed 'location)
  33    (if weak-ref
  34        (%boxed-copy (find-type-number (class-of boxed)) location)
  35      location))
  36   (call-next-method))
  37
  38 (defmethod instance-finalizer ((boxed boxed))
  39   (let ((location (proxy-location boxed))
  40         (type-number (find-type-number (class-of boxed))))
  41     (declare (type system-area-pointer location))
  42     #'(lambda ()
  43         (%boxed-free type-number location)
  44         (remove-cached-instance location))))
  45
  46
  47 (deftype-method translate-to-alien boxed (type-spec boxed &optional weak-ref)
  48   (if weak-ref
  49       `(proxy-location ,boxed)
  50     `(let ((boxed ,boxed))
  51        (%boxed-copy
  52         (find-type-number type-spec)
  53         (proxy-location boxed)))))
  54
  55 (deftype-method unreference-alien boxed (type-spec c-struct)
  56   `(%boxed-free ,(find-type-number type-spec) ,c-struct))
  57
  58
  59 (defbinding %boxed-copy () pointer
  60   (type type-number)
  61   (location pointer))
  62
  63 (defbinding %boxed-free () nil
  64   (type type-number)
  65   (location pointer))
  66
  67
  68 ;;;; Metaclass for boxed classes
  69
  70 (eval-when (:compile-toplevel :load-toplevel :execute)
  71   (defclass boxed-class (proxy-class)))
  72
  73
  74 (defmethod shared-initialize ((class boxed-class) names
  75                               &rest initargs
  76                               &key name alien-name type-init)
  77   (declare (ignore initargs names))
  78   (call-next-method)
  79
  80   (let* ((class-name (or name (class-name class)))
  81          (type-number
  82           (cond
  83            ((and alien-name type-init)
  84             (error
  85              "Specify either :type-init or :alien-name for class ~A"
  86              class-name))
  87            (alien-name (type-number-from-alien-name (first alien-name)))
  88            (type-init (funcall (mkbinding (first type-init) 'type-number)))
  89            (t
  90             (or
  91              (type-number-from-alien-name
  92               (default-alien-type-name class-name) nil)
  93              (funcall
  94               (mkbinding
  95                (default-alien-fname (format nil "~A_get_type" class-name))
  96                'type-number)))))))
  97     (setf (find-type-number class) type-number)))
  98
  99
 100 (defmethod validate-superclass
 101     ((class boxed-class) (super pcl::standard-class))
 102   (subtypep (class-name super) 'boxed))
 103
 104
 105 ;;;; Initializing type numbers
 106
 107 (setf (alien-type-name 'boxed) "GBoxed")