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