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 1.17 2005/01/03 16:37:16 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 (defcallback %destroy-user-data (nil (id unsigned-int))
32 (destroy-user-data id))
34 ;; Callback marshal for regular signal handlers
35 (defcallback closure-marshal (nil
38 (n-params unsigned-int)
39 (param-values pointer)
40 (invocation-hint pointer)
41 (callback-id unsigned-int))
42 (callback-trampoline callback-id n-params param-values return-value))
44 ;; Callback function for emission hooks
45 (defcallback signal-emission-hook (nil
46 (invocation-hint pointer)
47 (n-params unsigned-int)
48 (param-values pointer)
49 (callback-id unsigned-int))
50 (callback-trampoline callback-id n-params param-values))
52 (defun callback-trampoline (callback-id n-params param-values &optional
53 (return-value (make-pointer 0)))
54 (let* ((return-type (unless (null-pointer-p return-value)
55 (gvalue-type return-value)))
57 for n from 0 below n-params
58 collect (gvalue-get (sap+ param-values (* n +gvalue-size+))))))
59 (let ((result (apply #'invoke-callback callback-id return-type args)))
61 (gvalue-set return-value result)))))
63 (defun invoke-callback (callback-id return-type &rest args)
65 (apply (find-user-data callback-id) args)
66 (continue nil :report "Return from callback function"
68 (format *query-io* "Enter return value of type ~S: " return-type)
69 (force-output *query-io*)
70 (eval (read *query-io*))))
71 (re-invoke nil :report "Re-invoke callback function"
72 (apply #'invoke-callback callback-id return-type args))))
75 ;;;; Timeouts and idle functions
77 (defconstant +priority-high+ -100)
78 (defconstant +priority-default+ 0)
79 (defconstant +priority-high-idle+ 100)
80 (defconstant +priority-default-idle+ 200)
81 (defconstant +priority-low+ 300)
83 (defbinding source-remove () boolean
86 (defcallback source-callback-marshal (nil (callback-id unsigned-int))
87 (callback-trampoline callback-id 0 nil))
89 (defbinding (timeout-add "g_timeout_add_full")
90 (interval function &optional (priority +priority-default+)) unsigned-int
92 (interval unsigned-int)
93 ((callback source-callback-marshal) pointer)
94 ((register-callback-function function) unsigned-long)
95 ((callback %destroy-user-data) pointer))
97 (defun timeout-remove (timeout)
98 (source-remove timeout))
100 (defbinding (idle-add "g_idle_add_full")
101 (function &optional (priority +priority-default-idle+)) unsigned-int
103 ((callback source-callback-marshal) pointer)
104 ((register-callback-function function) unsigned-long)
105 ((callback %destroy-user-data) pointer))
107 (defun idle-remove (idle)
108 (source-remove idle))
111 ;;;; Signal information querying
113 (defbinding signal-lookup (name type) unsigned-int
114 ((signal-name-to-string name) string)
115 ((find-type-number type t) type-number))
117 (defbinding signal-name () (copy-of string)
118 (signal-id unsigned-int))
120 (defbinding signal-list-ids (type) (vector unsigned-int n-ids)
121 ((find-type-number type t) type-number)
122 (n-ids unsigned-int :out))
124 (defun signal-list-names (type)
125 (map 'list #'signal-name (signal-list-ids type)))
127 (defun ensure-signal-id-from-type (signal-id type)
129 (integer (if (signal-name signal-id)
131 (error "Invalid signal id: ~D" signal-id)))
133 (let ((numeric-id (signal-lookup signal-id type)))
134 (if (zerop numeric-id)
135 (error "Invalid signal name for ~S: ~D" type signal-id)
138 (defun ensure-signal-id (signal-id instance)
139 (ensure-signal-id-from-type signal-id (type-of instance)))
141 (eval-when (:compile-toplevel :load-toplevel :execute)
142 (deftype signal-flags ()
143 '(flags :run-first :run-last :run-cleanup :no-recurse
144 :detailed :action :no-hooks))
146 (defclass signal-query (struct)
147 ((id :allocation :alien :type unsigned-int)
148 (name :allocation :alien :type (copy-of string))
149 (type :allocation :alien :type type-number)
150 (flags :allocation :alien :type signal-flags)
151 (return-type :allocation :alien :type type-number)
152 (n-params :allocation :alien :type unsigned-int)
153 (param-types :allocation :alien :type pointer))
154 (:metaclass struct-class)))
156 (defbinding signal-query
157 (signal-id &optional (signal-query (make-instance 'signal-query))) nil
158 (signal-id unsigned-int)
159 (signal-query signal-query :return))
161 (defun signal-param-types (info)
162 (with-slots (n-params param-types) info
164 #'(lambda (type-number)
165 (type-from-number type-number))
166 param-types 'type-number n-params)))
169 (defun describe-signal (signal-id &optional type)
170 (let ((info (signal-query (ensure-signal-id-from-type signal-id type))))
171 (with-slots (id name type flags return-type n-params) info
172 (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))
173 (format t "Signal handlers should return ~A and take ~A~%"
175 ((= return-type (find-type-number "void")) "no values")
176 ((not (type-from-number return-type)) "values of unknown type")
177 ((format nil "values of type ~S" (type-from-number return-type))))
180 (format nil "arguments with the following types: ~A"
181 (signal-param-types info)))))))
184 ;;;; Signal connecting and controlling
186 (defbinding %signal-stop-emission () nil
188 (signal-id unsigned-int)
191 (defvar *signal-stop-emission* nil)
192 (declaim (special *signal-stop-emission*))
194 (defun signal-stop-emission ()
195 (if *signal-stop-emission*
196 (funcall *signal-stop-emission*)
197 (error "Not inside a signal handler")))
200 (defbinding signal-add-emission-hook (type signal function &key (detail 0))
202 ((ensure-signal-id-from-type signal type) unsigned-int)
204 ((callback signal-emission-hook) pointer)
205 ((register-callback-function function) unsigned-int)
206 ((callback %destroy-user-data) pointer))
208 (defbinding signal-remove-emission-hook (type signal hook-id) nil
209 ((ensure-signal-id-from-type signal type) unsigned-int)
210 (hook-id unsigned-int))
213 (defbinding (signal-has-handler-pending-p "g_signal_has_handler_pending")
214 (instance signal-id &key detail blocked) boolean
216 ((ensure-signal-id signal-id instance) unsigned-int)
217 ((or detail 0) quark)
218 (may-be-blocked boolean))
220 (defbinding %signal-connect-closure-by-id () unsigned-int
222 (signal-id unsigned-int)
227 (defbinding signal-handler-block () nil
229 (handler-id unsigned-int))
231 (defbinding signal-handler-unblock () nil
233 (handler-id unsigned-int))
235 (defbinding signal-handler-disconnect () nil
237 (handler-id unsigned-int))
239 (defbinding signal-handler-is-connected-p () boolean
241 (handler-id unsigned-int))
243 (defbinding (callback-closure-new "clg_callback_closure_new") () pointer
244 (callback-id unsigned-int)
246 (destroy-notify pointer))
248 (defun make-callback-closure (function)
249 (let ((callback-id (register-callback-function function)))
251 (callback-closure-new
252 callback-id (callback closure-marshal)
253 (callback %destroy-user-data))
256 (defmethod create-callback-function ((gobject gobject) function arg1)
258 ((or (eq arg1 t) (eq arg1 gobject)) function)
260 #'(lambda (&rest args) (apply function (rest args))))
262 #'(lambda (&rest args) (apply function arg1 (rest args))))))
264 (defmethod signal-connect ((gobject gobject) signal function
265 &key (detail 0) after object remove)
266 "Connects a callback function to a signal for a particular object. If
267 :OBJECT is T, the object connected to is passed as the first argument
268 to the callback function, or if :OBJECT is any other non NIL value, it
269 is passed as the first argument instead. If :AFTER is non NIL, the
270 handler will be called after the default handler for the signal. If
271 :REMOVE is non NIL, the handler will be removed after beeing invoked
274 (let* ((signal-id (ensure-signal-id signal gobject))
275 (signal-stop-emission
277 (%signal-stop-emission gobject signal-id detail)))
278 (callback (create-callback-function gobject function object))
279 (wrapper #'(lambda (&rest args)
280 (let ((*signal-stop-emission* signal-stop-emission))
281 (apply callback args)))))
282 (multiple-value-bind (closure-id callback-id)
283 (make-callback-closure wrapper)
284 (let ((handler-id (%signal-connect-closure-by-id
285 gobject signal-id detail closure-id after)))
287 (update-user-data callback-id
288 #'(lambda (&rest args)
290 (let ((*signal-stop-emission* signal-stop-emission))
291 (apply callback args))
292 (signal-handler-disconnect gobject handler-id)))))
298 (defbinding %signal-emitv () nil
300 (signal-id unsigned-int)
302 (return-value gvalue))
304 (defvar *signal-emit-functions* (make-hash-table))
306 (defun create-signal-emit-function (signal-id)
307 (let ((info (signal-query signal-id)))
308 (let* ((type (type-from-number (slot-value info 'type)))
309 (param-types (cons type (signal-param-types info)))
310 (return-type (type-from-number (slot-value info 'return-type)))
311 (n-params (1+ (slot-value info 'n-params)))
312 (params (allocate-memory (* n-params +gvalue-size+))))
313 #'(lambda (detail object &rest args)
314 (unless (= (length args) (1- n-params))
315 (error "Invalid number of arguments: ~A" (+ 2 (length args))))
318 for arg in (cons object args)
319 for type in param-types
320 as tmp = params then (sap+ tmp +gvalue-size+)
321 do (gvalue-init tmp type arg)
325 (with-gvalue (return-value)
326 (%signal-emitv params signal-id detail return-value)))
327 (%signal-emitv params signal-id detail (make-pointer 0))))
330 as tmp = params then (sap+ tmp +gvalue-size+)
332 do (gvalue-unset tmp)))))))
334 (defun signal-emit-with-detail (object signal detail &rest args)
335 (let* ((signal-id (ensure-signal-id signal object))
337 (gethash signal-id *signal-emit-functions*)
339 (gethash signal-id *signal-emit-functions*)
340 (create-signal-emit-function signal-id)))))
341 (apply function detail object args)))
343 (defun signal-emit (object signal &rest args)
344 (apply #'signal-emit-with-detail object signal 0 args))
350 ;; TODO: define and signal conditions based on log-level
352 (def-callback log-handler (c-call:void (domain c-call:c-string)
353 (log-level c-call:int)
354 (message c-call:c-string))
355 (error "~A: ~A" domain message))
357 (setf (extern-alien "log_handler" system-area-pointer) (callback log-handler))
360 ;;;; Convenient macros
362 (defmacro def-callback-marshal (name (return-type &rest args))
365 collect (if (atom arg) (gensym) (first arg))))
368 collect (if (atom arg) arg (second arg)))))
369 `(defcallback ,name (,return-type ,@(mapcar #'list names types)
370 (callback-id unsigned-int))
371 (invoke-callback callback-id ',return-type ,@names))))
373 (defmacro with-callback-function ((id function) &body body)
374 `(let ((,id (register-callback-function ,function)))
377 (destroy-user-data ,id))))