(defvar *description*)
(defvar *display*)
-(defvar *object*)
-
-(deflayer display-layer)
+(defvar *object* nil)
(define-layered-function display-using-description (description display object &rest args)
(:documentation
"Displays OBJECT via description using/in/with/on display"))
-(defun display (display object &rest args &key attributes )
- (let ((*display-attributes* attributes))
- (display-using-description (description-of object) display object args)))
+
+
+(defun modify-layer-context (context &key activate deactivate)
+ (dolist (d deactivate)
+ (setf context (remove-layer (find-description d)
+ context)))
+ (dolist (d activate context)
+ (setf context (adjoin-layer (find-description d)
+ context))))
+
+
+
+
+(defun display (display object &rest args &key deactivate activate &allow-other-keys)
+ (funcall-with-layer-context
+ (modify-layer-context (current-layer-context)
+ :activate activate
+ :deactivate deactivate)
+ (lambda ()
+ (apply #'display-using-description (description-of object) display object args))))
(define-layered-method display-using-description
:around (description display object &rest args)
(let ((*description* description)
(*display* display)
(*object* object))
- (call-next-method)))
+; (<:as-html " " description "Layer Active?: " (layer-active-p (defining-description 'maxclaims::link-to-viewer)))
+ (dletf (((described-object description) object))
+ (flet ((do-display ()
+ (contextl::funcall-with-special-initargs
+ (loop
+ :for (key val) :on args :by #'cddr
+ :collect (list (find key (description-attributes description)
+ :key #'attribute-keyword)
+ :value val))
+ (lambda ()
+ (contextl::funcall-with-special-initargs
+ (let ((attribute (ignore-errors (find-attribute description 'active-attributes))))
+ (when attribute
+ (loop for spec in (attribute-value attribute)
+ if (listp spec)
+ collect (cons (or
+ (find-attribute description (car spec))
+ (error "No attribute matching ~A" (car spec)))
+ (cdr spec)))))
+ (lambda () (call-next-method)))))))
+ (funcall-with-layer-context
+ (modify-layer-context
+ (if (standard-description-p description)
+ (adjoin-layer description (current-layer-context))
+ (current-layer-context))
+ :activate (description-active-descriptions description)
+ :deactivate (description-inactive-descriptions description))
+ (function do-display))))))
+
-(defun display/d (&rest args)
- (apply #'display-using-description args))
+(defun display/d (&rest args)
+ (apply #'display-using-description args))
+
(define-layered-method display-using-description (description display object &rest args)
(error "No DISPLAY-USING-DESCRIPTION methods are specified for: ~% DESCRIPTION: ~A ~% DISPLAY: ~A ~% OBJECT: ~A ~% ARGS: ~S
OMGWTF! If you didn't do this, it's a bug!" description display object args))
-
-
(defmacro define-display (&body body)
(loop with in-descriptionp = (eq (car body) :in-description)
with description = (if in-descriptionp (cadr body) 't)