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clarify auto scrollbars & on-event interaction (ie, they don't interact)

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original commit: f2d244cb1fd24cf4fc99a49f1d8f5d15f6e9fb43
This commit is contained in:
Robby Findler 2012-02-12 20:23:31 -06:00
parent 233cfe5643
commit 8af50844a0
1 changed files with 7 additions and 1 deletions
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6
collects/scribblings/gui/canvas-class.scrbl
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@ -190,6 +190,12 @@ With automatic scrollbars, the programmer specifies the desired
scrollbars are not automatically hidden if they are unneeded; see
@method[canvas% show-scrollbars].
The coordinates for mouse
events (passed to @method[canvas<%> on-event]) are not adjusted to
account for the position of the scrollbar;
use the @method[canvas% get-view-start] method to find suitable
offsets.
See also
@method[canvas% init-manual-scrollbars] for information about manual scrollbars. The horizontal and vertical
scrollbars are always either both manual or both automatic, but they