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svn: r15469

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This commit is contained in:
Matthias Felleisen 2009-07-17 01:34:38 +00:00
parent bc394a4f1e
commit 608dbc9405
1 changed files with 21 additions and 16 deletions
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37
collects/2htdp/uchat/chatter.ss
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@ -98,32 +98,37 @@
(line*-render (rest lines))))]))
;; -----------------------------------------------------------------------------
;; Line -> Image
;; String String -> Image
;; render a single display line
(define result0 (text (string-append SP "ada: hello") 11 "black"))
(check-expect (line-render "ada" "hello") result0)
(check-expect (line-render false "hello")
(text (string-append SP ": hello") 11 "black"))
(check-expect (line-render "ada" false)
(text (string-append SP "ada: ") 11 "black"))
(define (line-render addr msg)
(local ((define addr* (if (boolean? addr) "" addr))
(define msg* (if (boolean? msg) "" msg)))
(text (string-append SP addr* ": " msg*) 11 "black")))
(text (string-append SP addr ": " msg) 11 "black"))
;; -----------------------------------------------------------------------------
;; Line -> Image
;; render a single display line
;; StrFl StrFl -> Image
;; render a single display line, with a cursor at current 'editing' position
(check-expect (line-render-cursor "ada" "hello") (image-append result0 CURSOR))
(check-expect (line-render-cursor false false)
(image-append (text SP 11 "black") CURSOR))
(define (line-render-cursor addr msg)
(local ((define r (line-render addr msg)))
(image-append r CURSOR)))
(check-expect (line-render-cursor "ada" false)
(image-append (text (string-append SP "ada") 11 "black") CURSOR))
(check-expect (line-render-cursor "ada" "hello")
(image-append result0 CURSOR))
(define (line-render-cursor addr msg)
(cond
[(and (boolean? addr) (boolean? msg))
(image-append (text SP 11 "black") CURSOR)]
[(and (string? addr) (boolean? msg))
(image-append (text (string-append SP addr) 11 "black") CURSOR)]
[else
(image-append (text (string-append SP addr ": " msg) 11 "black") CURSOR)]))
;
;