/usr/share/guile-gnome-2/gnome/gobject/gobject.scm is in guile-gnome2-glib 2.16.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 | ;; guile-gnome
;; Copyright (C) 2001 Martin Baulig <martin@gnome.org>
;; Copyright (C) 2003,2004 Andy Wingo <wingo at pobox dot com>
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2 of
;; the License, or (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;; GObject is what is commonly understood as @emph{the} object system
;; for GLib. This is not strictly true. GObject is @emph{one}
;; implementation of an object system, built on the other modules:
;; GType, GValue, GParameter, GClosure, and GSignal.
;;
;; Similarly, this Guile module provides integration with the GObject
;; object system, built on the Guile modules that support GType, GValue,
;; GParameter, GClosure, and GSignal.
;;
;; The main class exported by this module is @code{<gobject>}.
;; @code{<gobject>} classes can be subclassed by the user, which will
;; register new subtypes with the GType runtime type system.
;; @code{<gobject>} classes are are also created as needed when wrapping
;; GObjects that come from C, for example from a function's return
;; value.
;;
;; Besides supporting derivation, and signals like other
;; @code{<gtype-instance>} implementations, @code{<gobject>} has the
;; concept of @dfn{properties}, which are @code{<gvalue>}'s associated
;; with the object. The values are constrained by @code{<gparam>}'s,
;; which are associated with the object's class. This module exports the
;; necessary routines to query, get, and set @code{<gobject>}
;; properties.
;;
;; In addition, this module defines the @code{<ginterface>} base class,
;; whose subclasses may be present as mixins of @code{<gobject>}
;; classes. For example:
;;
;; @lisp
;; (use-modules (gnome gtk) (oop goops))
;; (class-direct-supers <gtk-widget>) @result{}
;; (#<<gobject-class> <atk-implementor-iface> 3033bad0>
;; #<<gobject-class> <gtk-object> 3034bc90>)
;; @end lisp
;;
;; In this example, we see that @code{<gtk-widget>} has two
;; superclasses, @code{<gtk-object>} and @code{<atk-implementor-iface>}.
;; The second is an interface implemented by the @code{<gtk-widget>}
;; class. See @code{gtype-interfaces} for more details.
;;
;;; Code:
(define-module (gnome gobject gobject)
#:use-module ((srfi srfi-1) #:select (filter-map))
#:use-module (oop goops)
#:use-module (gnome gobject utils)
#:use-module (gnome gobject config)
#:use-module (gnome gobject gtype)
#:use-module (gnome gobject gvalue)
#:use-module (gnome gobject gparameter)
#:use-module (gnome gobject gsignal)
#:export (;; Classes
<gobject> <ginterface> <gparam-object>
;; Low-level subclassing
gtype-register-static
;; Methods to override
gobject:get-property gobject:set-property
;; Properties
gobject-class-get-properties gobject-class-find-property
gobject-class-get-property-names
gobject-get-property gobject-set-property))
(dynamic-call "scm_init_gnome_gobject"
(dynamic-link *guile-gnome-gobject-lib-path*))
;;;
;;; {Class Initialization}
;;;
(define-class <gobject-class> (<gtype-class>))
(define-method (compute-slots (class <gobject-class>))
(define (compute-extra-slots props slots)
(filter-map (lambda (prop)
(and (not (assq prop slots))
`(,prop #:allocation #:gproperty)))
props))
(let* ((slots (next-method))
(extra (compute-extra-slots
(gobject-class-get-property-names class) slots)))
(with-accessors (direct-slots)
(set! (direct-slots class) (append (direct-slots class) extra)))
(append slots extra)))
(define-method (compute-get-n-set (class <gobject-class>) slotdef)
(let ((name (slot-definition-name slotdef)))
(case (slot-definition-allocation slotdef)
((#:gproperty) (list (lambda (o) (gobject-get-property o name))
(lambda (o v) (gobject-set-property o name v))))
(else (next-method)))))
(define-method (initialize (class <gobject-class>) initargs)
(define (install-properties!)
;; To expose slots as gobject properties, <gobject> will process a
;; #:gparam slot option to create a new gobject property.
(for-each
(lambda (slot)
(let ((pspec (get-keyword #:gparam (slot-definition-options slot) #f)))
(if pspec
(gobject-class-install-property
class
(apply make
(car pspec) #:name (slot-definition-name slot)
(cdr pspec))))))
(class-direct-slots class)))
(define (install-signals!)
;; We parse a #:gsignal initialization argument to install signals.
(let loop ((args initargs))
(if (not (null? args))
(if (eq? (car args) #:gsignal)
(let ((signal (cadr args)))
(if (not (and (list? signal) (>= (length signal) 2)))
(gruntime-error "Invalid signal specification: ~A" signal))
(let* ((name (car signal))
(return-type (cadr signal))
(param-types (cddr signal))
(generic (gtype-class-create-signal class name return-type param-types)))
;; Some magic to define the generic
(module-define! (current-module)
(generic-function-name generic) generic)))
(loop (cddr args))))))
(define (first pred list)
(cond ((null? list) #f)
((pred (car list)) (car list))
(else (first pred (cdr list)))))
(define (gobject-class? c)
(memq <gobject> (class-precedence-list c)))
;; real work starts here
(next-method
class
(cons*
#:gtype-name
(or (get-keyword #:gtype-name initargs #f)
(gtype-register-static
(class-name->gtype-name (get-keyword #:name initargs #f))
(first gobject-class?
(apply append
(map class-precedence-list
(get-keyword #:dsupers initargs '()))))))
initargs))
(install-properties!)
(install-signals!))
(define-class-with-docs <gobject> (<gtype-instance>)
"The base class for GLib's default object system.
@code{<gobject>}'s metaclass understands a new slot option,
@code{#:gparam}, which will export a slot as a @code{<gobject>}
property. The default implementation will set and access the value from
the slot, but you can customize this by writing your own methods for
@code{gobject:set-property} and @code{gobject:get-property}.
In addition, the metaclass also understands @code{#:gsignal} arguments,
which define signals on the class, and define the generics for the
default signal handler. See @code{gtype-class-define-signal} for more
information.
For example:
@lisp
;; deriving from <gobject>
(define-class <test> (<gobject>)
;; a normal object slot
my-data
;; an object slot exported as a gobject property
(pub-data #:gparam (list <gparam-long> #:name 'test))
;; likewise, using non-default parameter settings
(foo-data #:gparam (list <gparam-long> #:name 'foo
#:minimum -3 #:maximum 1000
#:default-value 42))
;; a signal with no arguments and no return value
#:gsignal '(frobate #f)
;; a signal with arguments and a return value
#:gsignal (list 'frobate <gboolean> <gint> <glong>))
;; deriving from <test> -- also inherits properties and signals
(define-class <hungry> (<test>))
@end lisp
@code{<gobject>} classes also expose a slot for each GObject property
defined on the class, if such a slot is not already defined.
"
;; add a slot for signal generics instead of module-define! ?
#:metaclass <gobject-class>
#:gtype-name "GObject")
(define-class-with-docs <ginterface> (<gtype-instance>)
"The base class for GLib's interface types. Not derivable in Scheme."
#:metaclass <gobject-class>
#:gtype-name "GInterface")
(define (class-is-a? x is-a)
(memq is-a (class-precedence-list x)))
(define-class-with-docs <gparam-object> (<gparam>)
"Parameter for @code{<gobject>} values."
(object-type
#:init-keyword #:object-type #:allocation #:checked
#:pred (lambda (x) (is-a? x <gobject-class>)))
#:value-type <gobject>
#:gtype-name "GParamObject")
;;;
;;; {GObject Properties}
;;;
(define (gobject-class-find-property class name)
"Returns a property named @var{name} (a symbol), belonging to
@var{class} or one of its parent classes, or @code{#f} if not found."
(let ((propname name))
(with-accessors (name)
(let lp ((props (gobject-class-get-properties class)))
(cond ((null? props) #f)
((eq? (name (car props)) propname) (car props))
(else (lp (cdr props))))))))
(define-generic-with-docs gobject:set-property
"Called to set a gobject property. Only properties directly belonging
to the object's class will come through this function; superclasses
handle their own properties.
Takes three arguments: the object, the property name, and the value.
Call @code{(next-method)} in your methods to invoke the default handler.")
(define-method (gobject:set-property (object <gobject>) (name <symbol>) value)
"The default implementation of @code{gobject:set-property}, which sets
slots on the object."
(if (class-slot-definition (class-of object) name)
(slot-set! object name value)
(gruntime-error "Properties added after object definition must be accessed via custom property methods: ~A" name)))
(define-generic-with-docs gobject:get-property
"Called to get a gobject property. Only properties directly belonging
to the object's class will come through this function; superclasses
handle their own properties.
Takes two arguments: the object and the property name.
Call @code{(next-method)} in your methods to invoke the default handler")
(define-method (gobject:get-property (object <gobject>) (name <symbol>))
"The default implementation of @code{gobject:get-property}, which
calls @code{(slot-ref obj name)}."
(if (class-slot-definition (class-of object) name)
(slot-ref object name)
(gruntime-error "Properties added after object definition must be accessed via custom property methods: ~A" name)))
(%gnome-gobject-object-post-init)
|