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stop the world and let me get off (2)

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svn: r17112
This commit is contained in:
Matthias Felleisen 2009-11-30 18:22:38 +00:00
parent bb4c88338c
commit 571fec95aa
2 changed files with 21 additions and 16 deletions
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35
collects/2htdp/private/world.ss
View File

@ -215,26 +215,31 @@
(queue-callback
(lambda ()
(with-handlers ([exn? (handler #t)])
(define stop-it #f)
(define tag (format "~a callback" 'transform))
(define nw (transform (send world get) arg ...))
(when (package? nw)
(broadcast (package-message nw))
(set! nw (package-world nw)))
(printf "~s\n" nw)
(when (stop-the-world? nw)
(set! nw (stop-the-world-world nw))
(set! stop-it #t))
(let ([changed-world? (send world set tag nw)])
(unless changed-world?
(when draw (pdraw))
(when (or stop-it (pstop))
(when last-picture
(set! draw last-picture)
(pdraw))
(callback-stop! 'name)
(enable-images-button)))
changed-world?))))))
(if (stop-the-world? nw)
(begin
(set! nw (stop-the-world-world nw))
(send world set tag nw)
(when last-picture
(set! draw last-picture))
(when draw (pdraw))
(callback-stop! 'name)
(enable-images-button))
(let ([changed-world? (send world set tag nw)])
(unless changed-world?
(when draw (pdraw))
(when (pstop)
(printf "!stop!\n")
(when last-picture
(set! draw last-picture)
(pdraw))
(callback-stop! 'name)
(enable-images-button)))
changed-world?)))))))
;; tick, tock : deal with a tick event for this world
(def/pub-cback (ptock) tick)

2
collects/2htdp/universe.ss
View File

@ -24,7 +24,7 @@
(provide (all-from-out "private/image.ss"))
(provide
(rename-out (make-stop-the-world STOP!))) ;; World -> STOP!
(rename-out (make-stop-the-world stop-with))) ;; World -> STOP
(provide
launch-many-worlds