108 lines
3.7 KiB
Scheme
108 lines
3.7 KiB
Scheme
(module frp-snip mzscheme
|
|
(require (lib "class.ss")
|
|
(lib "string.ss")
|
|
(lib "list.ss")
|
|
|
|
;; FRP requires
|
|
|
|
(lib "frp-core.ss" "frtime")
|
|
(all-except (lib "lang-ext.ss" "frtime") undefined?)
|
|
; (rename (lib "frp-core.ss" "frtime") behavior? behavior?)
|
|
; (rename (lib "lang-ext.ss" "frtime") event? event?)
|
|
; (rename (lib "frp-core.ss" "frtime") signal? signal?)
|
|
;
|
|
; (rename (lib "frp-core.ss" "frtime") econs? econs?)
|
|
; (rename (lib "frp-core.ss" "frtime") efirst efirst)
|
|
;
|
|
; (rename (lib "frp-core.ss" "frtime") value-now value-now)
|
|
; (rename (lib "frp-core.ss" "frtime") signal-value signal-value)
|
|
; (rename (lib "lang-ext.ss" "frtime") undefined undefined)
|
|
; (rename (lib "lang-ext.ss" "frtime") undefined? frp:undefined?)
|
|
;
|
|
; (rename (lib "frp-core.ss" "frtime") proc->signal proc->signal)
|
|
|
|
;; MrEd require
|
|
(all-except (lib "mred.ss" "mred") send-event))
|
|
|
|
(define drs-eventspace #f)
|
|
|
|
(define (set-eventspace evspc)
|
|
(set! drs-eventspace evspc))
|
|
|
|
(define value-snip-copy%
|
|
(class string-snip%
|
|
(init-field current parent)
|
|
(inherit get-admin)
|
|
(define/public (set-current c)
|
|
(parameterize ([current-eventspace drs-eventspace])
|
|
(queue-callback
|
|
(lambda ()
|
|
(set! current c)
|
|
(let ([admin (get-admin)])
|
|
(when admin
|
|
(send admin needs-update this 0 0 2000 100)))))))
|
|
(define/override (draw dc x y left top right bottom dx dy draw-caret)
|
|
(send current draw dc x y left top right bottom dx dy draw-caret))
|
|
(super-instantiate (" "))))
|
|
|
|
(define (make-snip bhvr)
|
|
(make-object string-snip%
|
|
(let ([tmp (cond
|
|
[(behavior? bhvr) (value-now bhvr)]
|
|
[(event? bhvr) (signal-value bhvr)]
|
|
[else bhvr])])
|
|
(cond
|
|
[(econs? tmp) (format "#<event (last: ~a)>" (efirst tmp))]
|
|
[(undefined? tmp) "<undefined>"]
|
|
[else (expr->string tmp)]))))
|
|
|
|
(define value-snip%
|
|
(class string-snip%
|
|
(init-field bhvr)
|
|
(field [copies empty]
|
|
[loc-bhvr (proc->signal (lambda () (update)) bhvr)]
|
|
[current (make-snip bhvr)])
|
|
|
|
(define/override (copy)
|
|
(let ([ret (make-object value-snip-copy% current this)])
|
|
(set! copies (cons ret copies))
|
|
ret))
|
|
|
|
(define/public (update)
|
|
(set! current (make-snip bhvr))
|
|
(for-each (lambda (copy) (send copy set-current current)) copies))
|
|
|
|
(super-instantiate (" "))))
|
|
|
|
(define (render beh as-snip?)
|
|
(cond
|
|
[as-snip? (watch beh)]
|
|
[(undefined? (value-now beh)) "<undefined>"]
|
|
[(behavior? beh) (format "#<behavior (~a)>" (value-now beh))]
|
|
[(event? beh) (format "#<event (last: ~a)>" (efirst (signal-value beh)))]
|
|
[else beh]))
|
|
|
|
#;(define (get-rendering val super-render-fun)
|
|
(let-values ([(in out) (make-pipe-with-specials)])
|
|
(thread (lambda () (super-render-fun val out) (flush-output out) (close-output-port out)))
|
|
(let loop ([chars empty])
|
|
(let ([c (read-char-or-special in)])
|
|
(cond
|
|
[(eof-object? c) (list->string (reverse chars))]
|
|
[(char? c) (loop (cons c chars))]
|
|
[else c])))))
|
|
|
|
(define (watch beh)
|
|
(cond
|
|
[(undefined? beh)
|
|
(begin
|
|
;(printf "~a was regarded as undefined~n" beh)
|
|
(make-object string-snip% "<undefined>")
|
|
)
|
|
]
|
|
[(signal? beh) (make-object value-snip% beh)]
|
|
[else beh]))
|
|
|
|
(provide (all-defined))
|
|
)
|