[plt-scheme] 352.9

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Sun Oct 29 20:56:11 EST 2006

MzScheme and MrEd are now version 352.9 in the SVN repository trunk.

I once again solicit your help in testing keyboard input:


The changes in 352.9 are minor adjustments to key-event handling. A
key-event object now has more information about alternative
interpretations of the event with respect to the AltGr (Windows, X) and
Option (Mac) keys.

As a result, shortcut handling should be slightly better for non-U.S.
keyboard layouts. For example (setting aside that backslash is a
questionable choice for a menu shortcut), Ctl-< on a Danish PC keyboard
should now access the "Insert Lambda" menu item in DrScheme; the idea
is that AltGr-< is how you'd type \, and DrScheme has nothing better to
do with the combination Ctl-<, so it's accepted as Ctl-\. If a menu
item were mapped to Ctl-<, in contrast, that menu item would take
precedence, since it's a more precise match.

Note that Ctl-AtrGr-< is the same as AltGr-<, since AltGr-< really
means Alt-Ctl-<. Consequently, if there's ever a Ctl-< shortcut in
DrScheme, the Ctl-\ shortcut will be once again inaccessible in
Denmark; there's no way to distinguish Ctl-\ from Ctl-< or from plain
\. Such are the limitations of locale-insensitive shortcuts.

Given those limitations, it's not clear that the new shortcut
approximation for the AltGr key is a good idea at all. But this kind of
approximation has worked well so far for the Shift key, so we're trying
AltGr (and Option on the Mac), too.


Posted on the users mailing list.