(in-package :gobject)
+(defun g-type-from-object (object)
+ "Returns the GType of an @code{object}
+
+@arg[object]{C pointer to an object}
+@return{GType designator (see @class{g-type-designator})}"
+ (g-type-from-instance object))
+
+(defun g-type-from-class (g-class)
+ (g-type-name (foreign-slot-value g-class 'g-type-class :type)))
+
+(defun g-type-from-instance (type-instance)
+ (g-type-from-class (foreign-slot-value type-instance 'g-type-instance :class)))
+
+(defun g-type-from-interface (type-interface)
+ (g-type-name (foreign-slot-value type-interface 'g-type-interface :type)))
+
(defclass g-object ()
((pointer
:type cffi:foreign-pointer
(unwind-protect
(g-object-set-property (ensure-object-pointer object)
property-name value)
- (g-value-unset value))))
\ No newline at end of file
+ (g-value-unset value))))
+
+(defmethod parse-gvalue-for-type (gvalue-ptr (type-numeric (eql +g-type-object+)))
+ (parse-gvalue-object gvalue-ptr))
+
+(defmethod parse-gvalue-for-type (gvalue-ptr (type-numeric (eql +g-type-interface+)))
+ (parse-gvalue-object gvalue-ptr))
+
+(defmethod set-gvalue-for-type (gvalue-ptr (type-numeric (eql +g-type-object+)) value)
+ (set-gvalue-object gvalue-ptr value))
+
+(defmethod set-gvalue-for-type (gvalue-ptr (type-numeric (eql +g-type-interface+)) value)
+ (set-gvalue-object gvalue-ptr value))
+
+(defun emit-signal (object signal-name &rest args)
+ "Emits the signal.
+@arg[object]{an instance of @class{g-object}. Signal is emitted on this object}
+@arg[signal-name]{a string specifying the signal}
+@arg[args]{arguments for the signal}
+@return{none}"
+ (let* ((object-type (g-type-from-object (pointer object)))
+ (signal-info (parse-signal-name object-type signal-name)))
+ (unless signal-info
+ (error "Signal ~A not found on object ~A" signal-name object))
+ (let ((params-count (length (signal-info-param-types signal-info))))
+ (with-foreign-object (params 'g-value (1+ params-count))
+ (set-g-value (mem-aref params 'g-value 0) object object-type :zero-g-value t)
+ (iter (for i from 0 below params-count)
+ (for arg in args)
+ (for type in (signal-info-param-types signal-info))
+ (set-g-value (mem-aref params 'g-value (1+ i)) arg type :zero-g-value t))
+ (prog1
+ (if (= (g-type-numeric (signal-info-return-type signal-info)) +g-type-void+)
+ (g-signal-emitv params (signal-info-id signal-info) signal-name (null-pointer))
+ (with-foreign-object (return-value 'g-value)
+ (g-value-zero return-value)
+ (g-value-init return-value (signal-info-return-type signal-info))
+ (prog1 (parse-gvalue return-value)
+ (g-value-unset return-value))))
+ (iter (for i from 0 below (1+ params-count))
+ (g-value-unset (mem-aref params 'g-value i))))))))