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

   1 ;; Common Lisp bindings for GTK+ v2.0
   2 ;; Copyright (C) 2000 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: gtype.lisp,v 1.8 2001-04-29 20:17:07 espen Exp $
  19
  20 (in-package "GLIB")
  21
  22 (use-prefix "g")
  23
  24
  25 ;;;;
  26
  27 (deftype type-number () '(unsigned 32))
  28
  29 (eval-when (:compile-toplevel :load-toplevel :execute)
  30   (defclass type-query (alien-structure)
  31     ((type-number :allocation :alien :type type-number)
  32      (name :allocation :alien :type string)
  33      (class-size :allocation :alien :type unsigned-int)
  34      (instance-size :allocation :alien :type unsigned-int))
  35     (:metaclass proxy-class)))
  36
  37
  38 (defbinding ("g_type_name" alien-type-name) (type) (static string)
  39   ((find-type-number type) type-number))
  40
  41 (defbinding %type-from-name () type-number
  42   (name string))
  43
  44 (defbinding type-parent () type-number
  45   (type type-number))
  46
  47 (defbinding %type-query () nil
  48   (type type-number)
  49   (query type-query))
  50
  51 (defun type-query (type)
  52   (let ((query (make-instance 'type-query)))
  53     (%type-query (find-type-number type) query)
  54     query))
  55
  56 (defun type-instance-size (type)
  57   (slot-value (type-query type) 'instance-size))
  58
  59 (defun type-class-size (type)
  60   (slot-value (type-query type) 'class-size))
  61
  62 (defbinding type-class-ref () pointer
  63   (type type-number))
  64
  65 (defbinding type-class-unref () nil
  66   (type type-number))
  67
  68 (defbinding type-class-peek () pointer
  69   (type type-number))
  70
  71 (defbinding type-create-instance (type) pointer
  72   ((find-type-number type) type-number))
  73
  74 (defbinding type-free-instance () nil
  75   (instance pointer))
  76
  77
  78 (defvar *type-to-number-hash* (make-hash-table))
  79 (defvar *number-to-type-hash* (make-hash-table))
  80
  81 (defun type-number-from-alien-name (name &optional (error t))
  82   (if (string= name "invalid")
  83       0
  84     (let ((type-number (%type-from-name name)))
  85       (cond
  86        ((and (zerop type-number) error)
  87         (error "Invalid alien type name: ~A" name))
  88        ((zerop type-number) nil)
  89        (t type-number)))))
  90
  91 (defun (setf alien-type-name) (alien-name type)
  92   (let ((type-name (ensure-type-name type))
  93         (type-number (type-number-from-alien-name alien-name)))
  94     (setf (gethash type-number *number-to-type-hash*) type-name)
  95     (setf (gethash type-name *type-to-number-hash*) type-number)))
  96
  97 (defun (setf find-type-number) (type-number type)
  98   (setf (gethash (ensure-type-name type) *type-to-number-hash*) type-number))
  99
 100 (defun find-type-number (type)
 101   (etypecase type
 102     (integer type)
 103     (symbol (gethash type *type-to-number-hash*))
 104     (pcl::class (gethash (class-name type) *type-to-number-hash*))))
 105
 106 (defun type-from-number (type-number)
 107   (gethash type-number *number-to-type-hash*))
 108
 109 (defun type-number-of (object)
 110   (find-type-number (type-of object)))
 111
 112 (defun alien-function (name return-type &rest arg-types)
 113   (let ((alien
 114          (alien::%heap-alien
 115           (alien::make-heap-alien-info
 116            :type (alien::parse-alien-type
 117                   `(function ,@(cons return-type arg-types)))
 118            :sap-form (system:foreign-symbol-address name)))))
 119     #'(lambda (&rest args)
 120         (apply #'alien:alien-funcall alien args))))
 121
 122
 123 (defun type-init (name &optional init-fname)
 124   (funcall
 125    (alien-function
 126     (or
 127      init-fname
 128      (default-alien-fname (format nil "~A_get_type" name)))
 129     '(unsigned 32))))
 130
 131
 132 ;;;; Superclass for wrapping types in the glib type system
 133
 134 (eval-when (:compile-toplevel :load-toplevel :execute)
 135   (defclass ginstance (proxy)
 136     ()
 137     (:metaclass proxy-class)
 138     (:size 4 #|(size-of 'pointer|#)))
 139
 140 (defmethod initialize-proxy ((instance ginstance) &rest initargs &key location)
 141   (declare (ignore initargs))
 142   (setf
 143    (slot-value instance 'location)
 144    (funcall (ginstance-class-ref (class-of instance)) location))
 145   (call-next-method))
 146
 147 (defmethod instance-finalizer ((instance ginstance))
 148   (let ((location (proxy-location instance))
 149         (unref (ginstance-class-unref (class-of instance))))
 150     (declare (type system-area-pointer location))
 151     #'(lambda ()
 152         (funcall unref location)
 153         (remove-cached-instance location))))
 154
 155 (defun %type-of-ginstance (location)
 156   (let ((class (sap-ref-sap location 0)))
 157     (type-from-number (sap-ref-unsigned class 0))))
 158
 159 (deftype-method translate-from-alien
 160     ginstance (type-spec location &optional weak-ref)
 161   (declare (ignore type-spec))
 162   `(let ((location ,location))
 163      (unless (null-pointer-p location)
 164        (ensure-proxy-instance
 165         (%type-of-ginstance location) location ,weak-ref))))
 166
 167 (deftype-method translate-to-alien
 168     ginstance (type-spec object &optional weak-ref)
 169   (declare (ignore type-spec))
 170   (if weak-ref
 171       `(proxy-location ,object)
 172     `(let ((object ,object))
 173        (funcall
 174         (ginstance-class-ref (class-of object)) (proxy-location object)))))
 175
 176 (deftype-method unreference-alien ginstance (type-spec location)
 177   (declare (ignore type-spec))
 178   `(let* ((location ,location)
 179           (class (find-class (%type-of-ginstance location))))
 180      (funcall (ginstance-class-unref class) location)))
 181
 182
 183
 184 ;;;; Metaclass for subclasses of ginstance
 185
 186 (eval-when (:compile-toplevel :load-toplevel :execute)
 187   (defclass ginstance-class (proxy-class)
 188     ((ref :reader ginstance-class-ref)
 189      (unref :reader ginstance-class-unref))))
 190
 191
 192 (defmethod shared-initialize ((class ginstance-class) names
 193                               &rest initargs
 194                               &key name alien-name size
 195                               ref unref type-init)
 196   (declare (ignore initargs names))
 197   (call-next-method)
 198
 199   (let* ((class-name (or name (class-name class)))
 200          (type-number
 201           (cond
 202            ((and alien-name type-init)
 203             (error
 204              "Specify either :type-init or :alien-name for class ~A"
 205              class-name))
 206            (alien-name (type-number-from-alien-name (first alien-name)))
 207            (type-init (type-init class-name (first type-init)))
 208            (t
 209             (or
 210              (type-number-from-alien-name
 211               (default-alien-type-name class-name) nil)
 212              (type-init class-name))))))
 213     (setf (find-type-number class) type-number)
 214     (unless size
 215       (setf
 216        (slot-value class 'size)
 217        (type-instance-size (find-type-number class-name))))
 218     (when ref
 219       (setf
 220        (slot-value class 'ref)
 221        (alien-function (first ref) 'system-area-pointer 'system-area-pointer)))
 222     (when unref
 223       (setf
 224        (slot-value class 'unref)
 225        (alien-function (first unref) 'void 'system-area-pointer)))))
 226
 227 (defmethod shared-initialize :after ((class ginstance-class) names
 228                                      &rest initargs)
 229   (declare (ignore names initargs))
 230   (unless (slot-boundp class 'ref)
 231     (setf
 232      (slot-value class 'ref)
 233      (ginstance-class-ref (most-specific-proxy-superclass class))))
 234   (unless (slot-boundp class 'unref)
 235     (setf
 236      (slot-value class 'unref)
 237      (ginstance-class-unref (most-specific-proxy-superclass class)))))
 238
 239
 240 (defmethod validate-superclass
 241     ((class ginstance-class) (super pcl::standard-class))
 242   (subtypep (class-name super) 'ginstance))
 243
 244
 245 ;;;; Initializing type numbers
 246
 247 (setf (alien-type-name 'invalid) "invalid")
 248 (setf (alien-type-name 'char) "gchar")
 249 (setf (alien-type-name 'unsigned-char) "guchar")
 250 (setf (alien-type-name 'boolean) "gboolean")
 251 (setf (alien-type-name 'int) "gint")
 252 (setf (alien-type-name 'unsigned-int) "guint")
 253 (setf (alien-type-name 'long) "glong")
 254 (setf (alien-type-name 'unsigned-long) "gulong")
 255 (setf (alien-type-name 'single-float) "gfloat")
 256 (setf (alien-type-name 'double-float) "gdouble")
 257 (setf (alien-type-name 'string) "GString")
 258 (setf (find-type-number 'fixnum) (find-type-number 'int))