3 (defun unmangle-type (type)
4 (logxor type (ldb (byte 1 0) type)));;subtract the G_SIGNAL_TYPE_STATIC_SCOPE
6 (defun emit-signal (object signal-name &rest args)
8 @arg[object]{an instance of @class{g-object}. Signal is emitted on this object}
9 @arg[signal-name]{a string specifying the signal}
10 @arg[args]{arguments for the signal}
12 (let ((signal-id (g-signal-lookup signal-name (g-type-from-object (pointer object)))))
14 (error "Signal ~A not found on object ~A" signal-name object))
15 (with-foreign-object (q 'g-signal-query)
16 (g-signal-query signal-id q)
17 (with-foreign-object (params 'g-value (+ 1 (foreign-slot-value q 'g-signal-query :n-params)))
18 (set-g-value (mem-aref params 'g-value 0) object (g-type-from-object (pointer object)) :zero-g-value t)
19 (iter (for i from 0 below (foreign-slot-value q 'g-signal-query :n-params))
21 (for type = (unmangle-type (mem-aref (foreign-slot-value q 'g-signal-query :param-types) 'g-type i)))
22 (set-g-value (mem-aref params 'g-value (1+ i)) arg type :zero-g-value t))
24 (if (= (foreign-slot-value q 'g-signal-query :return-type) +g-type-void+)
25 (g-signal-emitv params signal-id signal-name (null-pointer))
26 (with-foreign-object (return-value 'g-value)
27 (g-value-zero return-value)
28 (g-value-init return-value (foreign-slot-value q 'g-signal-query :return-type))
29 (prog1 (parse-gvalue return-value)
30 (g-value-unset return-value))))
31 (iter (for i from 0 below (foreign-slot-value q 'g-signal-query :n-params))
32 (g-value-unset (mem-aref params 'g-value (1+ i)))))))))