+(defun install-properties (class)
+ (let* ((name (g-type-name (foreign-slot-value class 'g-type-class 'type)))
+ (lisp-type-info (gethash name *registered-types*)))
+ (iter (for property in (object-type-properties lisp-type-info))
+ (for param-spec = (property->param-spec property))
+ (for property-id from 123)
+ (debugf "installing property ~A~%" property)
+ (g-object-class-install-property class property-id param-spec))))
+
+(defun vtable-item->cstruct-item (item)
+ (if (eq :skip (first item))
+ (rest item)
+ (list (first item) :pointer)))
+
+(defstruct vtable-method-info name return-type args callback-name)
+
+(defmethod make-load-form ((object vtable-method-info) &optional environment)
+ (declare (ignore environment))
+ `(make-vtable-method-info :name ',(vtable-method-info-name object)
+ :return-type ',(vtable-method-info-return-type object)
+ :args ',(vtable-method-info-args object)
+ :callback-name ',(vtable-method-info-callback-name object)))
+
+(defun vtable-methods (items)
+ (iter (for item in items)
+ (when (eq :skip (first item)) (next-iteration))
+ (destructuring-bind (name callback-name return-type &rest args) item
+ (collect (make-vtable-method-info :name name :return-type return-type :args args :callback-name callback-name)))))
+
+(defvar *vtables* (make-hash-table :test 'equal))
+
+(defstruct vtable-description type-name cstruct-name methods)
+
+(defmacro define-vtable ((type-name cstruct-name) &body items)
+ `(progn
+ (defcstruct ,cstruct-name ,@(mapcar #'vtable-item->cstruct-item items))
+ (setf (gethash ,type-name *vtables*)
+ (make-vtable-description :type-name ,type-name :cstruct-name ',cstruct-name :methods (list ,@(mapcar #'make-load-form (vtable-methods items)))))
+ ,@(iter (for method in (vtable-methods items))
+ (collect `(defgeneric ,(vtable-method-info-name method) (,@(mapcar #'first (vtable-method-info-args method)))))
+ (collect `(defcallback ,(vtable-method-info-callback-name method) ,(vtable-method-info-return-type method)
+ (,@(vtable-method-info-args method))
+ (restart-case
+ (,(vtable-method-info-name method) ,@(mapcar #'first (vtable-method-info-args method)))
+ (return-from-interface-method-implementation (v) :interactive (lambda () (list (eval (read)))) v)))))))
+
+(defun interface-init (iface data)
+ (bind (((class-name interface-name) (prog1 (get-stable-pointer-value data) (free-stable-pointer data)))
+ (vtable (gethash interface-name *vtables*))
+ (vtable-cstruct (vtable-description-cstruct-name vtable)))
+ (debugf "interface-init for class ~A and interface ~A~%" class-name interface-name)
+ (iter (for method in (vtable-description-methods vtable))
+ (setf (foreign-slot-value iface vtable-cstruct (vtable-method-info-name method)) (get-callback (vtable-method-info-callback-name method))))))
+
+(defcallback c-interface-init :void ((iface :pointer) (data :pointer))
+ (interface-init iface data))
+
+(defun add-interface (name interface)
+ (let* ((interface-info (list name interface))
+ (interface-info-ptr (allocate-stable-pointer interface-info)))
+ (with-foreign-object (info 'g-interface-info)
+ (setf (foreign-slot-value info 'g-interface-info 'interface-init) (callback c-interface-init)
+ (foreign-slot-value info 'g-interface-info 'interface-data) interface-info-ptr)
+ (g-type-add-interface-static (g-type-from-name name) (ensure-g-type interface) info))))
+
+(defun add-interfaces (name)
+ (let* ((lisp-type-info (gethash name *registered-types*))
+ (interfaces (object-type-interfaces lisp-type-info)))
+ (iter (for interface in interfaces)
+ (add-interface name interface))))
+