From: Karl Ove Hufthammer (huftis@bigfoot.com)
Date: Mon Apr 22 2002 - 15:28:49 EDT
Paul Rohr <paul@abisource.com> wrote in
news:3.0.5.32.20020422085428.034194f0@mail.abisource.com:
> How should undo work for combining characters?
Well, combining characters may be input in several ways. On my
Norwegian keyboard, I write é by pressing the Alt Gr + 'the ´
deadkey', followed by an e. (BTW, note that the decomposed form of
é in Unicode is e´, not ´e.) On French keyboards, I believe there
is a separate é key. But exactly how the keypress --> character
sequence is generated should be done by the OS.
As for undoing a decomposed character (e.g. e´), I think it's safe
to undo all characters back to (and including) the last non-
combining character. For example if you write e´ (where ´ is not
actually ´, but the combining ´) and press undo, both characters
(which are probably displayed as one glyph) should be deleted. (In
practice é would/should be written as the pre-composed é character,
as per Normalization Form C <URL:
http://www.unicode.org/unicode/reports/tr15/ >. I only use it here
as an exaple.)
> What would a native speaker want to happen when you "undo" the
> entry of a single "on-screen" character?[1] I suspect that
> creating such an entity may take more than one step (in the
> input method editor), but should they always be undone
> individually?
In case similar to my example above, yes. But not always. See for
example the romaji input example at <URL:
http://www.w3.org/TR/charmod/#sec-CharExamples >. How this should
be handled is depedant on the actual input method used.
-- Karl Ove Hufthammer
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