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Re: Proposal to improve the nomenclature of scrolling directions
From: |
martin rudalics |
Subject: |
Re: Proposal to improve the nomenclature of scrolling directions |
Date: |
Sat, 10 Nov 2012 15:10:57 +0100 |
>> Not necessarily. We can always move point lazily, that is, whenever it
>> is requested.
>
> That requires changes to window-scrolling functions, since currently
> they do move point, and they do it non-lazily. See
> window_scroll_pixel_based, where it calls SET_PT_BOTH etc.
I meant to move `point' lazily _after_ we're done with scrolling. If
the emulation is on and the command is not a scrolling command
recognized by the emulation, move `point' to where it was before
scrolling. That's what I do in `scroll-restore-mode' (if wanted).
> And what does "whenever it is requested" means, anyway, in practical
> terms?
Whenever the current command is not a scroll command. In
`scroll-restore-mode' I do that in a pre-command hook.
> Those "other editors" that allow point to stay out of the
> window will scroll the display back to show point when some command is
> invoked that modifies the buffer text.
Where would we have `forward-char' start moving when emulating such
"other editors"?
> Given that the modification
> commands don't require moving point, and C-v/M-v won't either (as this
> is the main justification for the feature we are discussing), what
> will?
The modification commands can require moving point, if desired. But
while it might be useful to emulate other editors in this regard, the
main deficiencies we should concentrate on are:
- When scrolling for-/backward, a window's point should appear where it
was before we started scrolling. Currently, it doesn't when using
different faces and maybe in some other cases as well.
- Avoid the silly way the region is disfigured when it was scrolled
off-screen.
>> As long as scrolling proceeds, we can pretend (visually) that it's
>> somewhere else.
>
> You are describing the kludgey solution (IIUC), whereas I'm suggesting
> a non-kludgey one.
Every solution here will be kludgey. Suppose you scroll a non-selected
window and subsequently insert text into its buffer. Would you insert
it at its old `window-point' even if its `point' is somewhere else?
A basic invariant of Emacs is that at top-level any buffer's `point'
coincides with `window-point' of the selected window, provided the
buffer appears there. Violating this invariant means we have to rethink
lots of code, including things as fragile as the window configuration
code.
martin
- Re: Proposal to improve the nomenclature of scrolling directions, (continued)
- Re: Proposal to improve the nomenclature of scrolling directions, Richard Stallman, 2012/11/09
- Re: Proposal to improve the nomenclature of scrolling directions, Eli Zaretskii, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, martin rudalics, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, Eli Zaretskii, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, Nix, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, Eli Zaretskii, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, Nix, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions,
martin rudalics <=
- Re: Proposal to improve the nomenclature of scrolling directions, Eli Zaretskii, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, martin rudalics, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, Eli Zaretskii, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, martin rudalics, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, Eli Zaretskii, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, martin rudalics, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, martin rudalics, 2012/11/09
- Re: Proposal to improve the nomenclature of scrolling directions, Stefan Monnier, 2012/11/09
- Re: Proposal to improve the nomenclature of scrolling directions, martin rudalics, 2012/11/10
- Re: Proposal to improve the nomenclature of scrolling directions, Stephen J. Turnbull, 2012/11/08