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Re: enriched-mode and switching major modes.
From: |
Kim F. Storm |
Subject: |
Re: enriched-mode and switching major modes. |
Date: |
Sun, 19 Sep 2004 00:11:42 +0200 |
User-agent: |
Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3.50 (gnu/linux) |
"Eli Zaretskii" <address@hidden> writes:
> That is where I think we disagree: I think that the amount of Lisp
> code that relies on being able to deduce lots of layout-related issues
> by merely looking at the buffer is HUGE. You really do NOT want to
> modify every Emacs command like CUA Mode did.
I think you confuse CUA with s-region.el and pc-select.el which does
modify a lot of commands, or make strange key bindings to achieve the
"use shift to start/extend the region" behaviour.
CUA mode does NOT modify any "ordinary" commands.
Instead, CUA has a list of commands which it should recognize as "cursor
movement", so it can know when a shifted cursor movement key should
activate/extend the region.
>
>> And then there is also the point that this approach fails for the more
>> complicated things: tables with different font heights, paragraphs
>> with background colours and borders ...
>
> I suggest to discuss that and try to identify the specific problems
> that you think will cause such an approach to fail. Then we might
> have a better idea of the limitations of this approach, and could talk
> about solutions.
>
> In other words, the current design might indeed have to be changed,
> but I think you will agree that such changes need to be kept to a
> minimum, lest we end up redesigning Emacs. Talking about specific
> problems will help to come up with such a minimal set of changes.
I can see one such example:
Consider
A
A
to mean ONE double height A, while
b
c
are two normal height characters.
With the current emacs display engine, there is no way
to display something simple like
AAAbbbbbbb
AAAccccccc
The best emacs can do is:
AAAbbbbbbb
AAA
ccccccc
as it has a primitive "no overlapping line" display model.
Even worse if you have two 1.5 height characters on two lines (top half
of X belongs to the A, bottom half of X belongs to H)
A < line 1
X
H < line 2
You cannot display a mix of 2 and 3 lines like this:
AAAbbbbbbb
XXXccccccc
HHHddddddd
Again, the best emacs can do is something like
AAAbbbbbbb
VVV
^^^ccccccc
HHH
ddddddd
Still, in all of these examples, it is quite easy to see what <down>
arrow should do, and not too difficult to see what <right> should do
either.
--
Kim F. Storm <address@hidden> http://www.cua.dk
- Re: enriched-mode and switching major modes., (continued)
- Re: enriched-mode and switching major modes., Richard Stallman, 2004/09/25
- Re: enriched-mode and switching major modes., Eli Zaretskii, 2004/09/24
- Re: enriched-mode and switching major modes., Oliver Scholz, 2004/09/24
- Re: enriched-mode and switching major modes., Oliver Scholz, 2004/09/24
- Re: enriched-mode and switching major modes., Alex Schroeder, 2004/09/24
- Re: enriched-mode and switching major modes., Oliver Scholz, 2004/09/24
- Re: enriched-mode and switching major modes., Eli Zaretskii, 2004/09/25
- Re: enriched-mode and switching major modes., Oliver Scholz, 2004/09/22
- Re: enriched-mode and switching major modes., Richard Stallman, 2004/09/22
- Re: enriched-mode and switching major modes., Richard Stallman, 2004/09/19
- Re: enriched-mode and switching major modes.,
Kim F. Storm <=
- Re: enriched-mode and switching major modes., Eli Zaretskii, 2004/09/18
- Re: enriched-mode and switching major modes., Richard Stallman, 2004/09/19
- Re: enriched-mode and switching major modes., Oliver Scholz, 2004/09/20
- Re: enriched-mode and switching major modes., Kim F. Storm, 2004/09/20
- Re: enriched-mode and switching major modes., Richard Stallman, 2004/09/21
- Re: enriched-mode and switching major modes., Kim F. Storm, 2004/09/22
- Re: enriched-mode and switching major modes., Eli Zaretskii, 2004/09/22
- Re: enriched-mode and switching major modes., Kim F. Storm, 2004/09/22
- Re: enriched-mode and switching major modes., Eli Zaretskii, 2004/09/23
- Re: enriched-mode and switching major modes., Kim F. Storm, 2004/09/23