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 1.6 2001-10-21 22:02:01 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     (:copy %boxed-copy)
  28     (:free %boxed-free)))
  29
  30 (defbinding %boxed-copy (type location) pointer
  31   ((find-type-number type) type-number)
  32   (location pointer))
  33
  34 (defbinding %boxed-free (type location) nil
  35   ((find-type-number type) type-number)
  36   (location pointer))
  37
  38
  39 ;;;; Metaclass for boxed classes
  40
  41 (eval-when (:compile-toplevel :load-toplevel :execute)
  42   (defclass boxed-class (proxy-class))
  43
  44
  45   (defmethod shared-initialize ((class boxed-class) names
  46                                 &rest initargs &key name alien-name)
  47     (declare (ignore initargs names))
  48     (call-next-method)
  49
  50     (let* ((class-name (or name (class-name class)))
  51            (type-number
  52             (find-type-number
  53              (or (first alien-name) (default-alien-type-name class-name)))))
  54       (register-type class-name type-number)))
  55
  56
  57   (defmethod validate-superclass
  58     ((class boxed-class) (super pcl::standard-class))
  59     (subtypep (class-name super) 'boxed)))
  60
  61
  62 ;;;;
  63
  64 (defun expand-boxed-type (type-number &optional slots)
  65   `(defclass ,(type-from-number type-number) (boxed)
  66      ,slots
  67      (:metaclass boxed-class)
  68      (:alien-name ,(find-type-name type-number))))
  69
  70 (register-derivable-type 'boxed "GBoxed" 'expand-boxed-type)
  71
  72 ;;;; Special boxed types
  73
  74 (defclass gstring (boxed)
  75   ()
  76   (:metaclass boxed-class)
  77   (:alien-name "GString"))
  78
  79 (deftype-method translate-from-alien
  80     gstring (type-spec location &optional weak-ref)
  81   `(let ((location ,location))
  82      (unless (null-pointer-p location)
  83        (prog1
  84            (c-call::%naturalize-c-string location)
  85          ,(unless weak-ref
  86             (unreference-alien type-spec location))))))
  87
  88 (deftype-method translate-to-alien
  89     gstring (type-spec string &optional weak-ref)
  90   (declare (ignore type-spec weak-ref))
  91   `(let ((string ,string))
  92      ;; Always copy strings to prevent seg fault due to GC
  93      (funcall
  94       ',(proxy-class-copy (find-class type-spec))
  95       ',type-spec
  96       (make-pointer (1+ (kernel:get-lisp-obj-address string))))))
  97
  98 (deftype-method cleanup-alien gstring (type-spec c-string &optional weak-ref)
  99   (when weak-ref
 100     (unreference-alien type-spec c-string)))
 101