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fixed 10922

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This commit is contained in:
Matthias Felleisen 2010-05-24 10:03:59 -04:00
parent f1d258f20b
commit f243a0e617
1 changed files with 7 additions and 2 deletions
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collects/teachpack/2htdp/scribblings/universe.scrbl
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@ -375,13 +375,18 @@ All @tech{MouseEvent}s are represented via strings:
#:contracts #:contracts
([clack-expr ([clack-expr
(-> (unsyntax @tech{WorldState}) (-> (unsyntax @tech{WorldState})
natural-number/c natural-number/c (unsyntax @tech{MouseEvent}) integer? integer? (unsyntax @tech{MouseEvent})
(unsyntax @tech{WorldState}))])]{ (unsyntax @tech{WorldState}))])]{
tell DrRacket to call @scheme[clack-expr] on the current world, the current tell DrRacket to call @scheme[clack-expr] on the current world, the current
@scheme[x] and @scheme[y] coordinates of the mouse, and and a @scheme[x] and @scheme[y] coordinates of the mouse, and and a
@tech{MouseEvent} for every (noticeable) action of the mouse by the @tech{MouseEvent} for every (noticeable) action of the mouse by the
computer user. The result of the call becomes the current world. computer user. The result of the call becomes the current world.
For @scheme["leave"] and @scheme["enter"] events, the coordinates of the
mouse click may be outside of the (implicitly) rectangle. That is, the
coordinates may be negative or larger than the (implicitly) specified
width and height.
Note: the computer's software doesn't really notice every single movement Note: the computer's software doesn't really notice every single movement
of the mouse (across the mouse pad). Instead it samples the movements and of the mouse (across the mouse pad). Instead it samples the movements and
signals most of them.} signals most of them.}
@ -698,7 +703,7 @@ As mentioned, all event handlers may return @tech{WorldState}s or
#:contracts #:contracts
([clack-expr ([clack-expr
(-> (unsyntax @tech{WorldState}) (-> (unsyntax @tech{WorldState})
natural-number/c natural-number/c (unsyntax @tech{MouseEvent}) integer? integer? (unsyntax @tech{MouseEvent})
(or/c (unsyntax @tech{WorldState}) package?))])]{ (or/c (unsyntax @tech{WorldState}) package?))])]{
} }