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clarify chaining precedence rules

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Robby Findler 2016-07-22 07:34:39 -05:00
parent cb81e3768d
commit ed5f0ae09b
1 changed files with 7 additions and 3 deletions
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gui-doc/scribblings/gui/keymap-class.scrbl
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@ -101,9 +101,13 @@ If @racket[try-chain?] is not @racket[#f], keymaps chained to this one
void?]{ void?]{
Chains @racket[next] off @this-obj[] The @racket[next] keymap will be Chains @racket[next] off @this-obj[] The @racket[next] keymap will be
used to handle events which are not handled by @this-obj[]. If used to handle events which are not handled by @this-obj[].
@racket[prefix?] is a true value, then @racket[next] will take
precedence over other keymaps already chained to @this-obj[]. If @racket[prefix?] is a true value, then @racket[next] will take
precedence over other keymaps already chained to @this-obj[] in the
case that both keymaps map the same key sequence.
When one chained keymap maps a key that is a prefix of another, then the
shorter key sequence is always used, regardless of @racket[prefix?].
Multiple keymaps can be chained off one keymap using @method[keymap% Multiple keymaps can be chained off one keymap using @method[keymap%
chain-to-keymap]. When keymaps are chained off a main keymap, events chain-to-keymap]. When keymaps are chained off a main keymap, events