From f2d244cb1fd24cf4fc99a49f1d8f5d15f6e9fb43 Mon Sep 17 00:00:00 2001 From: Robby Findler Date: Sun, 12 Feb 2012 20:23:31 -0600 Subject: [PATCH] clarify auto scrollbars & on-event interaction (ie, they don't interact) --- collects/scribblings/gui/canvas-class.scrbl | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/collects/scribblings/gui/canvas-class.scrbl b/collects/scribblings/gui/canvas-class.scrbl index 1af63abe4a..cdc3edf166 100644 --- a/collects/scribblings/gui/canvas-class.scrbl +++ b/collects/scribblings/gui/canvas-class.scrbl @@ -188,7 +188,13 @@ With automatic scrollbars, the programmer specifies the desired virtual size of the canvas, and the scrollbars are automatically handled to allow the user to scroll around the virtual area. The scrollbars are not automatically hidden if they are unneeded; see -@method[canvas% show-scrollbars]. +@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