3 ;;; Signal handler closures
5 (defcstruct lisp-signal-handler-closure
6 (:parent-instance g-closure)
9 (defctype lisp-signal-handler-closure (:struct lisp-signal-handler-closure))
11 (defun finalize-lisp-signal-handler-closure (closure)
12 (let* ((function-id (foreign-slot-value closure 'lisp-signal-handler-closure :function-id))
13 (addr (pointer-address (foreign-slot-value closure 'lisp-signal-handler-closure :object)))
14 (object (or (gethash addr *foreign-gobjects-strong*)
15 (gethash addr *foreign-gobjects-weak*))))
17 (delete-handler-from-object object function-id))))
19 (defcallback lisp-signal-handler-closure-finalize :void
20 ((data :pointer) (closure (:pointer lisp-signal-handler-closure)))
21 (declare (ignore data))
22 (finalize-lisp-signal-handler-closure closure))
24 (defun call-with-restarts (fn args)
27 (return-from-g-closure (&optional v) :report "Return value from closure" v)))
29 (defcallback lisp-signal-handler-closure-marshal :void
30 ((closure (:pointer lisp-signal-handler-closure))
31 (return-value (:pointer g-value))
33 (args (:pointer g-value))
34 (invocation-hint :pointer)
35 (marshal-data :pointer))
36 (declare (ignore invocation-hint marshal-data))
37 (let* ((args (parse-closure-arguments count-of-args args))
38 (function-id (foreign-slot-value closure 'lisp-signal-handler-closure :function-id))
39 (addr (pointer-address (foreign-slot-value closure 'lisp-signal-handler-closure :object)))
40 (object (or (gethash addr *foreign-gobjects-strong*)
41 (gethash addr *foreign-gobjects-weak*)))
42 (return-type (and (not (null-pointer-p return-value))
43 (g-value-type return-value)))
44 (fn (retrieve-handler-from-object object function-id))
45 (fn-result (call-with-restarts fn args)))
47 (set-g-value return-value fn-result return-type :g-value-init nil))))
49 (defun parse-closure-arguments (count-of-args args)
51 for i from 0 below count-of-args
52 collect (parse-g-value (mem-aref args 'g-value i))))
54 (defun create-signal-handler-closure (object fn)
55 (let ((function-id (save-handler-to-object object fn))
56 (closure (g-closure-new-simple (foreign-type-size 'lisp-signal-handler-closure) (null-pointer))))
57 (setf (foreign-slot-value closure 'lisp-signal-handler-closure :function-id) function-id
58 (foreign-slot-value closure 'lisp-signal-handler-closure :object) (pointer object))
59 (g-closure-add-finalize-notifier closure (null-pointer)
60 (callback lisp-signal-handler-closure-finalize))
61 (g-closure-set-marshal closure (callback lisp-signal-handler-closure-marshal))
64 (defun find-free-signal-handler-id (object)
65 (iter (with handlers = (g-object-signal-handlers object))
66 (for i from 0 below (length handlers))
67 (finding i such-that (null (aref handlers i)))))
69 (defun save-handler-to-object (object handler)
71 (let ((id (find-free-signal-handler-id object))
72 (handlers (g-object-signal-handlers object)))
74 (progn (setf (aref handlers id) handler) id)
75 (progn (vector-push-extend handler handlers) (1- (length handlers))))))
77 (defun retrieve-handler-from-object (object handler-id)
78 (aref (g-object-signal-handlers object) handler-id))
80 (defun delete-handler-from-object (object handler-id)
81 (let ((handlers (g-object-signal-handlers object)))
82 (setf (aref handlers handler-id) nil)
83 (iter (while (plusp (length handlers)))
84 (while (null (aref handlers (1- (length handlers)))))
85 (vector-pop handlers))
88 (defun connect-signal (object signal handler &key after)
89 "Connects the function to a signal for a particular object.
90 If @code{after} is true, then the function will be called after the default handler of the signal.
92 @arg[object]{an instance of @class{gobject}}
93 @arg[signal]{a string; names the signal}
94 @arg[handler]{a function; handles the signal. Number (and type) of arguments and return value type depends on the signal}
95 @arg[after]{a boolean}"
96 (g-signal-connect-closure (pointer object)
98 (create-signal-handler-closure object handler)
101 (defun g-signal-connect (object signal handler &key after)
102 "Deprecated alias for @fun{connect-signal}"
103 (connect-signal object signal handler :after after))
105 (defun emit-signal (object signal-name &rest args)
107 @arg[object]{an instance of @class{g-object}. Signal is emitted on this object}
108 @arg[signal-name]{a string specifying the signal}
109 @arg[args]{arguments for the signal}
111 (let* ((object-type (g-type-from-object (pointer object)))
112 (signal-info (parse-signal-name object-type signal-name)))
114 (error "Signal ~A not found on object ~A" signal-name object))
115 (let ((params-count (length (signal-info-param-types signal-info))))
116 (with-foreign-object (params 'g-value (1+ params-count))
117 (set-g-value (mem-aref params 'g-value 0) object object-type :zero-g-value t)
118 (iter (for i from 0 below params-count)
120 (for type in (signal-info-param-types signal-info))
121 (set-g-value (mem-aref params 'g-value (1+ i)) arg type :zero-g-value t))
123 (if (eq (signal-info-return-type signal-info) (gtype +g-type-void+))
124 (g-signal-emitv params (signal-info-id signal-info) signal-name (null-pointer))
125 (with-foreign-object (return-value 'g-value)
126 (g-value-zero return-value)
127 (g-value-init return-value (signal-info-return-type signal-info))
128 (prog1 (parse-g-value return-value)
129 (g-value-unset return-value))))
130 (iter (for i from 0 below (1+ params-count))
131 (g-value-unset (mem-aref params 'g-value i))))))))
133 (defcfun (disconnect-signal "g_signal_handler_disconnect") :void