From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-bidi@gnu.org, emacs-devel@gnu.org
Subject: Re: Mixed L2R and R2L paragraphs and horizontal scroll
Date: Mon, 01 Feb 2010 10:36:13 -0500 [thread overview]
Message-ID: <jwvaavtdlmd.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <83tyu3iu6b.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 30 Jan 2010 15:44:28 +0200")
> Here's a peculiar design decision that needs to be made for the bidi
> display: how to display horizontally scrolled lines in a buffer with
> mixed L2R and R2L paragraphs.
That's a tricky question indeed. I don't know if there are other text
editors with similar problems from which to get inspiration.
So it seems we have 3 options:
- "saturated scrolling" where hscroll can be positive or negative and
l2r lines won't scroll at all when hscroll is negative and vice-versa.
- "inverted scrolling" where hscroll is always positive and is
interpreted as scrolling in the direction of the line, so the
direction can change from one line to the next.
- "rigid scrolling" where the window-width determines the distance
between l2r's leftmost position and r2l's rightmost position and then
the text is taken as extending both left and right from those, so
hscroll can be positive or negative and lines can be scrolled "before
their beginning".
Inverted scrolling seem to be easier to implement. It has the downside
that C-x > will scroll "the other way" in R2L contexts, but maybe it's
not that terrible: there's always a source of confusion when talking
about scrolling direction anyway, because we can either think of
scrolling the text under a fixed window, or scrolling a window over
a fixed text.
Stefan
prev parent reply other threads:[~2010-02-01 15:36 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-30 13:44 Mixed L2R and R2L paragraphs and horizontal scroll Eli Zaretskii
2010-01-30 15:14 ` David De La Harpe Golden
2010-01-30 15:33 ` Eli Zaretskii
2010-01-30 16:36 ` martin rudalics
2010-01-30 17:01 ` Eli Zaretskii
2010-01-30 17:22 ` martin rudalics
2010-01-30 17:52 ` Eli Zaretskii
2010-01-30 18:31 ` martin rudalics
2010-01-30 19:12 ` Eli Zaretskii
2010-01-30 19:45 ` martin rudalics
2010-01-30 21:40 ` Eli Zaretskii
2010-01-31 9:36 ` martin rudalics
2010-01-31 18:02 ` Eli Zaretskii
2010-01-31 20:01 ` martin rudalics
2010-01-31 21:53 ` Miles Bader
2010-02-01 4:12 ` Eli Zaretskii
2010-02-01 8:34 ` martin rudalics
2010-02-01 4:11 ` Eli Zaretskii
2010-02-01 8:34 ` martin rudalics
2010-02-01 20:21 ` Eli Zaretskii
2010-02-02 8:08 ` martin rudalics
2010-02-02 19:30 ` Eli Zaretskii
2010-02-03 16:06 ` martin rudalics
2010-02-01 21:05 ` Richard Stallman
2010-02-02 8:08 ` martin rudalics
2010-02-02 13:23 ` tomas
2010-02-02 14:39 ` martin rudalics
2010-02-02 19:32 ` Eli Zaretskii
2010-02-06 6:29 ` tomas
2010-02-02 21:21 ` Richard Stallman
2010-02-06 6:35 ` tomas
2010-02-06 14:46 ` David De La Harpe Golden
2010-02-06 22:55 ` Richard Stallman
2010-02-02 21:21 ` Richard Stallman
2010-01-30 23:26 ` David De La Harpe Golden
2010-01-31 12:42 ` Richard Stallman
2010-01-31 15:02 ` David De La Harpe Golden
2010-01-31 18:20 ` Eli Zaretskii
2010-01-31 18:16 ` Eli Zaretskii
2010-02-01 21:05 ` Richard Stallman
2010-02-01 21:51 ` Eli Zaretskii
2010-02-02 21:21 ` Richard Stallman
2010-02-01 14:00 ` Ehud Karni
2010-02-01 20:18 ` Eli Zaretskii
2010-02-01 22:05 ` [emacs-bidi] " Ehud Karni
2010-02-02 20:04 ` Eli Zaretskii
2010-02-03 13:10 ` Ehud Karni
2010-02-03 18:59 ` Eli Zaretskii
2010-02-04 11:01 ` Richard Stallman
2010-02-04 15:14 ` [emacs-bidi] " Stefan Monnier
2010-02-04 15:57 ` David Kastrup
2010-02-04 17:21 ` Davis Herring
2010-02-04 19:33 ` Eli Zaretskii
2010-02-04 20:46 ` [emacs-bidi] " tomas
2010-02-04 22:23 ` Eli Zaretskii
2010-02-06 6:41 ` [emacs-bidi] " tomas
2010-02-04 22:05 ` Stefan Monnier
2010-02-04 19:12 ` Eli Zaretskii
2010-02-05 12:44 ` Richard Stallman
2010-02-05 13:30 ` Eli Zaretskii
2010-02-05 18:06 ` [emacs-bidi] " Stefan Monnier
2010-02-05 21:48 ` Eli Zaretskii
2010-02-06 22:55 ` Richard Stallman
2010-02-07 4:08 ` Eli Zaretskii
2010-02-07 8:35 ` David Kastrup
2010-02-07 15:05 ` Richard Stallman
2010-02-04 14:02 ` [emacs-bidi] " Ehud Karni
2010-02-04 19:30 ` Eli Zaretskii
2010-02-04 19:48 ` [emacs-bidi] " Eli Zaretskii
2010-02-06 6:52 ` tomas
2010-02-03 21:02 ` Davis Herring
2010-02-04 4:16 ` Bidirectional embeddings (was: Mixed L2R and R2L paragraphs and horizontal scroll) Eli Zaretskii
2010-02-04 16:21 ` [emacs-bidi] Mixed L2R and R2L paragraphs and horizontal scroll Ehud Karni
2010-02-04 19:40 ` Eli Zaretskii
2010-02-04 22:13 ` [emacs-bidi] " Stefan Monnier
2010-02-05 9:50 ` Eli Zaretskii
2010-02-05 10:47 ` Eli Zaretskii
2010-02-05 18:06 ` [emacs-bidi] " Stefan Monnier
2010-02-06 13:39 ` David De La Harpe Golden
2010-02-06 15:45 ` Ehud Karni
2010-02-06 19:38 ` Eli Zaretskii
2010-02-06 21:18 ` [emacs-bidi] " David De La Harpe Golden
2010-02-11 21:40 ` Beni Cherniavsky
2010-02-12 11:03 ` Eli Zaretskii
2010-02-12 12:36 ` Eli Zaretskii
2010-02-05 12:21 ` [emacs-bidi] " Ehud Karni
2010-02-05 13:47 ` Eli Zaretskii
2010-02-05 14:22 ` Miles Bader
2010-02-05 14:52 ` Eli Zaretskii
2010-02-06 1:07 ` Miles Bader
2010-02-06 9:03 ` Eli Zaretskii
2010-02-06 9:32 ` Miles Bader
2010-02-06 15:42 ` [emacs-bidi] " Ehud Karni
2010-02-06 19:14 ` Eli Zaretskii
2010-02-03 13:22 ` [emacs-bidi] " Ehud Karni
2010-02-03 19:01 ` Eli Zaretskii
2010-02-04 14:08 ` [emacs-bidi] " Ehud Karni
2010-02-01 15:36 ` Stefan Monnier [this message]
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