e7c5f95a |
1 | (in-package :lisp-on-lines) |
2 | |
b1c8f43b |
3 | |
e7c5f95a |
4 | (defvar *display*) |
b1c8f43b |
5 | |
6de8d300 |
6 | |
e7c5f95a |
7 | (define-layered-function display-using-description (description display object &rest args) |
8 | (:documentation |
9 | "Displays OBJECT via description using/in/with/on display")) |
10 | |
b7657b86 |
11 | |
12 | |
13 | (defun modify-layer-context (context &key activate deactivate) |
14 | (dolist (d deactivate) |
15 | (setf context (remove-layer (find-description d) |
16 | context))) |
17 | (dolist (d activate context) |
18 | (setf context (adjoin-layer (find-description d) |
19 | context)))) |
20 | |
21 | |
22 | |
23 | |
24 | (defun display (display object &rest args &key deactivate activate &allow-other-keys) |
46440824 |
25 | |
b7657b86 |
26 | (funcall-with-layer-context |
27 | (modify-layer-context (current-layer-context) |
28 | :activate activate |
29 | :deactivate deactivate) |
30 | (lambda () |
31 | (apply #'display-using-description (description-of object) display object args)))) |
e7c5f95a |
32 | |
33 | (define-layered-method display-using-description |
34 | :around (description display object &rest args) |
4358148e |
35 | (declare (ignorable args)) |
46440824 |
36 | #+nil (break "Entering DISPLAY for ~A on ~A using ~A" object display description) |
b1c8f43b |
37 | (let ((*display* display)) |
38 | (apply #'funcall-with-described-object |
39 | (lambda () |
40 | (call-next-method)) |
41 | object description args))) |
b7657b86 |
42 | |
43 | |
44 | |
6de8d300 |
45 | |
e7c5f95a |
46 | |
4271ab0b |
47 | (defun display/d (&rest args) |
48 | (apply #'display-using-description args)) |
49 | |
e7c5f95a |
50 | (define-layered-method display-using-description (description display object &rest args) |
51 | (error "No DISPLAY-USING-DESCRIPTION methods are specified for: ~% DESCRIPTION: ~A ~% DISPLAY: ~A ~% OBJECT: ~A ~% ARGS: ~S |
52 | |
53 | OMGWTF! If you didn't do this, it's a bug!" description display object args)) |
54 | |
e7c5f95a |
55 | (defmacro define-display (&body body) |
4358148e |
56 | (loop with in-descriptionp = (eq (car body) :in-description) |
57 | with description = (if in-descriptionp (cadr body) 't) |
58 | for tail on (if in-descriptionp (cddr body) body) |
e7c5f95a |
59 | until (listp (car tail)) |
60 | collect (car tail) into qualifiers |
61 | finally |
4358148e |
62 | (when (member :in-description qualifiers) |
63 | (error "Incorrect occurrence of :in-description in defdisplay. Must occur before qualifiers.")) |
e7c5f95a |
64 | (return |
65 | (destructuring-bind (description-spec &optional (display-spec (gensym)) (object-spec (gensym))) |
66 | (car tail) |
b1c8f43b |
67 | `(define-layered-method |
e7c5f95a |
68 | display-using-description |
4358148e |
69 | :in-layer ,(if (eq t description) |
70 | t |
71 | (defining-description description)) |
e7c5f95a |
72 | ,@qualifiers |
73 | (,(if (listp description-spec) |
74 | (list (first description-spec) |
75 | (if (eq 'description (second description-spec)) |
76 | 'description |
77 | (defining-description (second description-spec))))) |
78 | ,display-spec |
79 | ,object-spec &rest args) |
80 | (declare (ignorable args)) |
81 | ,@(cdr tail)))))) |
82 | |
83 | |
84 | |
85 | |