1 ;; Common Lisp bindings for GTK+ v2.0
2 ;; Copyright (C) 2000 Espen S. Johnsen <esj@stud.cs.uit.no>
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.
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.
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
18 ;; $Id: gcallback.lisp,v 1.21 2005/02/14 00:41:54 espen Exp $
25 ;;;; Callback invokation
27 (defun register-callback-function (function)
28 (check-type function (or null symbol function))
29 (register-user-data function))
31 ;; Callback marshal for regular signal handlers
32 (defcallback closure-marshal (nil
35 (n-params unsigned-int)
36 (param-values pointer)
37 (invocation-hint pointer)
38 (callback-id unsigned-int))
39 (callback-trampoline callback-id n-params param-values return-value))
41 ;; Callback function for emission hooks
42 (defcallback signal-emission-hook (nil
43 (invocation-hint pointer)
44 (n-params unsigned-int)
45 (param-values pointer)
46 (callback-id unsigned-int))
47 (callback-trampoline callback-id n-params param-values))
49 (defun callback-trampoline (callback-id n-params param-values &optional
50 (return-value (make-pointer 0)))
51 (let* ((return-type (unless (null-pointer-p return-value)
52 (gvalue-type return-value)))
54 for n from 0 below n-params
55 collect (gvalue-get (sap+ param-values (* n +gvalue-size+))))))
56 (let ((result (apply #'invoke-callback callback-id return-type args)))
58 (gvalue-set return-value result)))))
60 (defun invoke-callback (callback-id return-type &rest args)
62 (apply (find-user-data callback-id) args)
63 (continue nil :report "Return from callback function"
65 (format *query-io* "Enter return value of type ~S: " return-type)
66 (force-output *query-io*)
67 (eval (read *query-io*))))
68 (re-invoke nil :report "Re-invoke callback function"
69 (apply #'invoke-callback callback-id return-type args))))
72 ;;;; Timeouts and idle functions
74 (defconstant +priority-high+ -100)
75 (defconstant +priority-default+ 0)
76 (defconstant +priority-high-idle+ 100)
77 (defconstant +priority-default-idle+ 200)
78 (defconstant +priority-low+ 300)
80 (defbinding source-remove () boolean
83 (defcallback source-callback-marshal (nil (callback-id unsigned-int))
84 (callback-trampoline callback-id 0 nil))
86 (defbinding (timeout-add "g_timeout_add_full")
87 (interval function &optional (priority +priority-default+)) unsigned-int
89 (interval unsigned-int)
90 ((callback source-callback-marshal) pointer)
91 ((register-callback-function function) unsigned-long)
92 ((callback user-data-destroy-func) pointer))
94 (defun timeout-remove (timeout)
95 (source-remove timeout))
97 (defbinding (idle-add "g_idle_add_full")
98 (function &optional (priority +priority-default-idle+)) unsigned-int
100 ((callback source-callback-marshal) pointer)
101 ((register-callback-function function) unsigned-long)
102 ((callback user-data-destroy-func) pointer))
104 (defun idle-remove (idle)
105 (source-remove idle))
108 ;;;; Signal information querying
110 (defbinding signal-lookup (name type) unsigned-int
111 ((signal-name-to-string name) string)
112 ((find-type-number type t) type-number))
114 (defbinding signal-name () (copy-of string)
115 (signal-id unsigned-int))
117 (defbinding signal-list-ids (type) (vector unsigned-int n-ids)
118 ((find-type-number type t) type-number)
119 (n-ids unsigned-int :out))
121 (defun signal-list-names (type)
122 (map 'list #'signal-name (signal-list-ids type)))
124 (defun ensure-signal-id-from-type (signal-id type)
126 (integer (if (signal-name signal-id)
128 (error "Invalid signal id: ~D" signal-id)))
130 (let ((numeric-id (signal-lookup signal-id type)))
131 (if (zerop numeric-id)
132 (error "Invalid signal name for ~S: ~D" type signal-id)
135 (defun ensure-signal-id (signal-id instance)
136 (ensure-signal-id-from-type signal-id (type-of instance)))
138 (eval-when (:compile-toplevel :load-toplevel :execute)
139 (deftype signal-flags ()
140 '(flags :run-first :run-last :run-cleanup :no-recurse
141 :detailed :action :no-hooks))
143 (defclass signal-query (struct)
144 ((id :allocation :alien :type unsigned-int)
145 (name :allocation :alien :type (copy-of string))
146 (type :allocation :alien :type type-number)
147 (flags :allocation :alien :type signal-flags)
148 (return-type :allocation :alien :type type-number)
149 (n-params :allocation :alien :type unsigned-int)
150 (param-types :allocation :alien :type pointer))
151 (:metaclass struct-class)))
153 (defbinding signal-query
154 (signal-id &optional (signal-query (make-instance 'signal-query))) nil
155 (signal-id unsigned-int)
156 (signal-query signal-query :return))
158 (defun signal-param-types (info)
159 (with-slots (n-params param-types) info
161 #'(lambda (type-number)
162 (type-from-number type-number))
163 param-types 'type-number n-params)))
166 (defun describe-signal (signal-id &optional type)
167 (let ((info (signal-query (ensure-signal-id-from-type signal-id type))))
168 (with-slots (id name type flags return-type n-params) info
169 (format t "The signal with id ~D is named '~A' and may be emitted on instances of type ~S~%~%" id name (type-from-number type t))
170 (format t "Signal handlers should return ~A and take ~A~%"
172 ((= return-type (find-type-number "void")) "no values")
173 ((not (type-from-number return-type)) "values of unknown type")
174 ((format nil "values of type ~S" (type-from-number return-type))))
177 (format nil "arguments with the following types: ~A"
178 (signal-param-types info)))))))
181 ;;;; Signal connecting and controlling
183 (defbinding %signal-stop-emission () nil
185 (signal-id unsigned-int)
188 (defvar *signal-stop-emission* nil)
189 (declaim (special *signal-stop-emission*))
191 (defun signal-stop-emission ()
192 (if *signal-stop-emission*
193 (funcall *signal-stop-emission*)
194 (error "Not inside a signal handler")))
197 (defbinding signal-add-emission-hook (type signal function &key (detail 0))
199 ((ensure-signal-id-from-type signal type) unsigned-int)
201 ((callback signal-emission-hook) pointer)
202 ((register-callback-function function) unsigned-int)
203 ((callback user-data-destroy-func) pointer))
205 (defbinding signal-remove-emission-hook (type signal hook-id) nil
206 ((ensure-signal-id-from-type signal type) unsigned-int)
207 (hook-id unsigned-int))
210 (defbinding (signal-has-handler-pending-p "g_signal_has_handler_pending")
211 (instance signal-id &key detail blocked) boolean
213 ((ensure-signal-id signal-id instance) unsigned-int)
214 ((or detail 0) quark)
217 (defbinding %signal-connect-closure-by-id () unsigned-int
219 (signal-id unsigned-int)
224 (defbinding signal-handler-block () nil
226 (handler-id unsigned-int))
228 (defbinding signal-handler-unblock () nil
230 (handler-id unsigned-int))
232 (defbinding signal-handler-disconnect () nil
234 (handler-id unsigned-int))
236 (defbinding signal-handler-is-connected-p () boolean
238 (handler-id unsigned-int))
240 (deftype gclosure () 'pointer)
242 (defbinding (callback-closure-new "clg_callback_closure_new") () gclosure
243 (callback-id unsigned-int)
245 (destroy-notify pointer))
247 (defun make-callback-closure (function)
248 (let ((callback-id (register-callback-function function)))
250 (callback-closure-new
251 callback-id (callback closure-marshal)
252 (callback user-data-destroy-func))
255 (defgeneric create-callback-function (gobject function arg1))
257 (defmethod create-callback-function ((gobject gobject) function arg1)
259 ((or (eq arg1 t) (eq arg1 gobject)) function)
261 #'(lambda (&rest args) (apply function (rest args))))
263 #'(lambda (&rest args) (apply function arg1 (rest args))))))
265 (defgeneric signal-connect (gobject signal function &key))
267 (defmethod signal-connect ((gobject gobject) signal function
268 &key (detail 0) after object remove)
269 "Connects a callback function to a signal for a particular object. If
270 :OBJECT is T, the object connected to is passed as the first argument
271 to the callback function, or if :OBJECT is any other non NIL value, it
272 is passed as the first argument instead. If :AFTER is non NIL, the
273 handler will be called after the default handler for the signal. If
274 :REMOVE is non NIL, the handler will be removed after beeing invoked
277 (let* ((signal-id (ensure-signal-id signal gobject))
278 (signal-stop-emission
280 (%signal-stop-emission gobject signal-id detail)))
281 (callback (create-callback-function gobject function object))
282 (wrapper #'(lambda (&rest args)
283 (let ((*signal-stop-emission* signal-stop-emission))
284 (apply callback args)))))
285 (multiple-value-bind (closure-id callback-id)
286 (make-callback-closure wrapper)
287 (let ((handler-id (%signal-connect-closure-by-id
288 gobject signal-id detail closure-id after)))
290 (update-user-data callback-id
291 #'(lambda (&rest args)
293 (let ((*signal-stop-emission* signal-stop-emission))
294 (apply callback args))
295 (signal-handler-disconnect gobject handler-id)))))
301 (defbinding %signal-emitv () nil
303 (signal-id unsigned-int)
305 (return-value gvalue))
307 (defvar *signal-emit-functions* (make-hash-table))
309 (defun create-signal-emit-function (signal-id)
310 (let ((info (signal-query signal-id)))
311 (let* ((type (type-from-number (slot-value info 'type)))
312 (param-types (cons type (signal-param-types info)))
313 (return-type (type-from-number (slot-value info 'return-type)))
314 (n-params (1+ (slot-value info 'n-params)))
315 (params (allocate-memory (* n-params +gvalue-size+))))
316 #'(lambda (detail object &rest args)
317 (unless (= (length args) (1- n-params))
318 (error "Invalid number of arguments: ~A" (+ 2 (length args))))
321 for arg in (cons object args)
322 for type in param-types
323 as tmp = params then (sap+ tmp +gvalue-size+)
324 do (gvalue-init tmp type arg)
328 (with-gvalue (return-value)
329 (%signal-emitv params signal-id detail return-value)))
330 (%signal-emitv params signal-id detail (make-pointer 0))))
333 as tmp = params then (sap+ tmp +gvalue-size+)
335 do (gvalue-unset tmp)))))))
337 (defun signal-emit-with-detail (object signal detail &rest args)
338 (let* ((signal-id (ensure-signal-id signal object))
340 (gethash signal-id *signal-emit-functions*)
342 (gethash signal-id *signal-emit-functions*)
343 (create-signal-emit-function signal-id)))))
344 (apply function detail object args)))
346 (defun signal-emit (object signal &rest args)
347 (apply #'signal-emit-with-detail object signal 0 args))
350 ;;;; Convenient macros
352 (defmacro def-callback-marshal (name (return-type &rest args))
355 collect (if (atom arg) (gensym) (first arg))))
358 collect (if (atom arg) arg (second arg)))))
359 `(defcallback ,name (,return-type ,@(mapcar #'list names types)
360 (callback-id unsigned-int))
361 (invoke-callback callback-id ',return-type ,@names))))
363 (defmacro with-callback-function ((id function) &body body)
364 `(let ((,id (register-callback-function ,function)))
367 (destroy-user-data ,id))))