From: Eli Zaretskii <eliz@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Selection threshold with mouse
Date: Sun, 20 Jul 2014 19:24:22 +0300 [thread overview]
Message-ID: <83pph03snd.fsf@gnu.org> (raw)
In-Reply-To: <jwvsilwxcxk.fsf-monnier+gnu.emacs.help@gnu.org>
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Sun, 20 Jul 2014 11:37:34 -0400
>
> > That's the "silly iteration" I had in mind: the 2nd part of this is
> > the tricky one, because all we know from posn-at-x-y and its ilk is
> > the pixel width of the object at the coordinates we pass to the
> > function; we don't know the coordinates where the object starts.
>
> Hmm... but don't the display matrices contain the needed info (i.e. the
> "left-pixel boundary position"), since it's needed to react to an
> expose event?
Not sure I follow (what does an expose event have to do with the issue
at hand?). In any case, we cannot rely on glyph matrices alone,
because that would severely limit the usefulness of such an API.
E.g., you will be unable to use it in a function that is called
several times in a row, like via a numeric argument or from a keyboard
macro. Also, some modes, like linum-mode, never let you have an
up-to-date glyph matrix.
For these reasons, posn-at-x-y etc. do not rely on glyph matrices, but
instead simulate display.
> > Actually, I disagree: every other GUI app I could try behaves like the
> > OP asked by default, so I see no reason for Emacs to offer an option
> > here.
>
> They do, but not for all operations. E.g. if you click on the rightmost
> pixel of a hyperlink, your browser will happily consider that the click
> was on the hyperlink, not on the position right after that one.
I think hyperlinks are the odd one out, and not directly related to
the issue here, which is where to put point given a click, especially
in the context of highlighting the region.
next prev parent reply other threads:[~2014-07-20 16:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-19 8:32 Selection threshold with mouse Tak Kunihiro
2014-07-19 17:31 ` Drew Adams
2014-07-19 23:52 ` Tak Kunihiro
2014-07-20 1:22 ` Stefan Monnier
2014-07-20 4:23 ` Eli Zaretskii
[not found] ` <mailman.5728.1405830249.1147.help-gnu-emacs@gnu.org>
2014-07-20 14:37 ` Stefan Monnier
2014-07-20 15:04 ` Eli Zaretskii
[not found] ` <mailman.5763.1405868682.1147.help-gnu-emacs@gnu.org>
2014-07-20 15:37 ` Stefan Monnier
2014-07-20 16:24 ` Eli Zaretskii [this message]
[not found] ` <mailman.5768.1405873481.1147.help-gnu-emacs@gnu.org>
2014-07-20 16:44 ` Stefan Monnier
2014-07-20 17:21 ` Eli Zaretskii
2014-07-21 14:20 ` Stefan Monnier
2014-07-21 15:31 ` Eli Zaretskii
2014-07-23 0:27 ` Tak Kunihiro
2014-07-25 8:41 ` Eli Zaretskii
2014-07-20 1:26 ` Michael Heerdegen
[not found] ` <mailman.5704.1405791121.1147.help-gnu-emacs@gnu.org>
2014-07-19 18:26 ` Barry Margolin
2014-07-19 18:47 ` Eli Zaretskii
[not found] ` <<837g395gp2.fsf@gnu.org>
2014-07-19 19:41 ` Drew Adams
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=83pph03snd.fsf@gnu.org \
--to=eliz@gnu.org \
--cc=help-gnu-emacs@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.