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strings for Universe callbacks

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svn: r14645
This commit is contained in:
Matthias Felleisen 2009-04-29 03:09:06 +00:00
parent 10e0e08143
commit 6cdf2ed976
1 changed files with 81 additions and 12 deletions
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93
collects/teachpack/2htdp/scribblings/universe.scrbl
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@ -217,20 +217,89 @@ current world. The clock ticks at the rate of @scheme[rate-expr].}}
@deftech{KeyEvent} : @scheme[(or/c char? symbol?)]
A character is used to signal that the user has hit an alphanumeric
key. A symbol denotes arrow keys or special events:
A single-character string is used to signal that the user has hit an alphanumeric
key. Some of these one-character strings may look unusual:
@itemize[
@item{@scheme[" "] stands for the space bar (@scheme[#\space]);}
@item{@scheme["\r"] stands for the return key (@scheme[#\return]);}
@item{@scheme["\t"] stands for the tab key (@scheme[#\tab]); and}
@item{@scheme["\b"] stands for the backspace key (@scheme[#\backspace]).}
]
On rare occasions you may also encounter @scheme["\u007F"], which is the
string representing the delete key (aka rubout).
@item{@scheme['left] is the left arrow,}
@item{@scheme['right] is the right arrow,}
@item{@scheme['up] is the up arrow,}
@item{@scheme['down] is the down arrow, and}
@item{@scheme['release] is the event of releasing a key.}
A string with more than one character denotes arrow keys or other special events,
starting with the most important:
@itemize[
@item{@scheme["left"] is the left arrow;}
@item{@scheme["right"] is the right arrow;}
@item{@scheme["up"] is the up arrow;}
@item{@scheme["down"] is the down arrow;}
@item{@scheme["release"] is the event of releasing a key;}
@item{@scheme["start"]}
@item{@scheme["cancel"]}
@item{@scheme["clear"]}
@item{@scheme["shift"]}
@item{@scheme["control"]}
@item{@scheme["menu"]}
@item{@scheme["pause"]}
@item{@scheme["capital"]}
@item{@scheme["prior"]}
@item{@scheme["next"]}
@item{@scheme["end"]}
@item{@scheme["home"]}
@item{@scheme["escape"]}
@item{@scheme["select"]}
@item{@scheme["print"]}
@item{@scheme["execute"]}
@item{@scheme["snapshot"]}
@item{@scheme["insert"]}
@item{@scheme["help"]}
@item{@scheme["numpad0"],
@scheme["numpad1"],
@scheme["numpad2"],
@scheme["numpad3"],
@scheme["numpad4"],
@scheme["numpad5"],
@scheme["numpad6"],
@scheme["numpad7"],
@scheme["numpad8"],
@scheme["numpad9"],
@scheme["numpad-enter"],
@scheme["multiply"],
@scheme["add"],
@scheme["separator"],
@scheme["subtract"],
@scheme["decimal"],
@scheme["divide"]}
@item{@scheme["'f1"],
@scheme["f2"],
@scheme["f3"],
@scheme["f4"],
@scheme["f5"],
@scheme["f6"],
@scheme["f7"],
@scheme["f8"],
@scheme["f9"],
@scheme["f10"],
@scheme["f11"],
@scheme["f12"],
@scheme["f13"],
@scheme["f14"],
@scheme["f15"],
@scheme["f16"],
@scheme["f17"],
@scheme["f18"],
@scheme["f19"],
@scheme["f20"],
@scheme["f21"],
@scheme["f22"],
@scheme["f23"],
@scheme["f24"]}
@item{@scheme["numlock"]}
@item{@scheme["scroll"]}
@item{@scheme["wheel-up"]}
@item{@scheme["wheel-down"]}
]
@defproc[(key-event? [x any]) boolean?]{