mdw@git.distorted.org.uk Git - clg/blob - glib/gcallback.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: gcallback.lisp,v 1.4 2001-10-21 21:58:44 espen Exp $
  19
  20 (in-package "GLIB")
  21
  22 (use-prefix "g")
  23
  24
  25 ;;;; Closures
  26
  27 (deftype gclosure () 'pointer)
  28
  29 (defbinding lisp-callback-closure-new () gclosure
  30   (callback-id unsigned-int))
  31
  32
  33
  34 ;;;; Callback mechanism
  35
  36 (defun register-callback-function (function)
  37   (check-type function (or null symbol function))
  38   (lisp-callback-closure-new (register-user-data function)))
  39
  40 (defun callback-trampoline (callback-id params return-value)
  41   (let* ((return-type (unless (null-pointer-p return-value)
  42                         (type-from-number (gvalue-type return-value))))
  43          (args nil)
  44          (callback-function (find-user-data callback-id)))
  45
  46     (destructuring-bind (nparams . param-values) params
  47       (dotimes (n nparams)
  48         (push (gvalue-get (sap+ param-values (* n +gvalue-size+))) args)))
  49
  50     (labels ((invoke-callback ()
  51                (restart-case
  52                    (unwind-protect
  53                        (let ((result (apply callback-function (reverse args))))
  54                          (when return-type
  55                            (gvalue-set return-value result))))
  56
  57                  (continue nil :report "Return from callback function"
  58                   (when return-type
  59                     (format
  60                      *query-io*
  61                      "Enter return value of type ~S: "
  62                      return-type)
  63                     (force-output *query-io*)
  64                     (gvalue-set return-value (eval (read *query-io*)))))
  65                  (re-invoke nil :report "Re-invoke callback function"
  66                   (invoke-callback)))))
  67       (invoke-callback))))
  68
  69 (defun after-gc-hook ()
  70   (setf
  71    (extern-alien "callback_trampoline" system-area-pointer)
  72    (make-pointer (kernel:get-lisp-obj-address #'callback-trampoline))
  73    (extern-alien "destroy_user_data" system-area-pointer)
  74    (make-pointer (kernel:get-lisp-obj-address #'destroy-user-data))))
  75
  76 (pushnew 'after-gc-hook ext:*after-gc-hooks*)
  77 (after-gc-hook)
  78
  79
  80
  81 ;;;; Signals
  82
  83 (defun signal-name-to-string (name)
  84   (substitute #\_ #\- (string-downcase (string name))))
  85
  86 (defbinding signal-lookup (name itype) unsigned-int
  87   ((signal-name-to-string name) string)
  88   (itype type-number))
  89
  90 (defbinding signal-name () string
  91   (signal-id unsigned-int))
  92
  93 (defun ensure-signal-id (signal-id instance)
  94   (etypecase signal-id
  95     (integer signal-id)
  96     (string (signal-lookup signal-id (type-number-of instance)))
  97     (symbol (signal-lookup signal-id (type-number-of instance)))))
  98
  99 (defbinding signal-stop-emission (instance signal-id) nil
 100   (instance ginstance)
 101   ((ensure-signal-id signal-id instance) unsigned-int))
 102
 103 ; (defbinding (signal-add-emisson-hook "g_signal_add_emission_hook_full")
 104 ;     () unsigned-int
 105 ;   (signal-id unsigned-int)
 106 ;   (closure gclosure))
 107
 108 ; (defbinding signal-remove-emisson-hook () nil
 109 ;   (signal-id unsigned-int)
 110 ;   (hook-id unsigned-int))
 111
 112 (defbinding (signal-has-handler-pending-p "g_signal_has_handler_pending")
 113     (instance signal-id &key detail blocked) boolean
 114   (instance ginstance)
 115   ((ensure-signal-id signal-id instance) unsigned-int)
 116   ((or detail 0) quark)
 117   (blocked boolean))
 118
 119 (defbinding (signal-connect-closure "g_signal_connect_closure_by_id")
 120     (instance signal-id closure &key detail after) unsigned-int
 121   (instance ginstance)
 122   ((ensure-signal-id signal-id instance) unsigned-int)
 123   ((or detail 0) quark)
 124   (closure gclosure)
 125   (after boolean))
 126
 127 (defbinding signal-handler-block () nil
 128   (instance ginstance)
 129   (handler unsigned-int))
 130
 131 (defbinding signal-handler-unblock () nil
 132   (instance ginstance)
 133   (handler unsigned-int))
 134
 135 (defbinding signal-handler-disconnect () nil
 136   (instance ginstance)
 137   (handler unsigned-int))
 138
 139
 140 (defmethod signal-connect ((gobject gobject) signal function &rest args &key after object)
 141   (cond
 142    ((or (eq object t) (eq object gobject)) function)
 143    ((not object)
 144     #'(lambda (&rest args) (apply function (cdr args))))
 145    (t
 146     #'(lambda (&rest args) (apply function object (rest args))))))
 147
 148
 149 (defmethod signal-connect :around ((gobject gobject) signal function
 150                                    &key after object)
 151   (let ((callback-id (register-callback-function (call-next-method))))
 152     (signal-connect-closure gobject signal callback-id :after after)))