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document weak reference by `notify-on-change'

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Matthew Flatt 2011-01-07 13:02:09 -07:00
parent be6ba896e0
commit a5660f38eb
1 changed files with 2 additions and 1 deletions
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collects/scribblings/gui/style-list-class.scrbl
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@ -126,7 +126,8 @@ The @scheme[like-style] style must be in this style list, otherwise
@defmethod[(notify-on-change [f ((or/c (is-a?/c style<%>) #f) . -> . any)])
any/c]{
Attaches a callback to the style list. The callback is invoked
Attaches a callback to the style list, retaining the callback only weakly (in
the sense of @racket[make-weak-box]). The callback is invoked
whenever a style is modified.
Often, a change in one style will trigger a change in several other