From: "Drew Adams" <drew.adams@oracle.com>
To: "'Chong Yidong'" <cyd@stupidchicken.com>,
"'Eli Zaretskii'" <eliz@gnu.org>
Cc: 7390@debbugs.gnu.org
Subject: bug#7390: 24.0.50; pos-col-row gives incorrect row
Date: Sat, 13 Nov 2010 13:38:01 -0800 [thread overview]
Message-ID: <A8857ABE52AA451D8CFC12ABF59E4ED8@us.oracle.com> (raw)
In-Reply-To: <87eiapkjv9.fsf@stupidchicken.com>
Thanks to you both for fixing this so quickly.
> The underlying situation is currently somewhat unsatisfactory---the
> pixel position of a mouse-event in the text area counts X
> from the start of the text area (excluding margins and fringes),
> and Y from the top of the window (including the header line).
Yes, that's an inconsistency.
But what do we want "pixel" position to mean? Both (1) a position within the
text area and (2) a position overall (including things like scroll bars and
header lines can be useful.
We should not sacrifice one for the other. What you need in terms of a position
depends on what you are trying to do. It seems we need either two different
functions (for each such positioning function) or an argument that determines
the behavior.
> This arises from some internal redisplay engine semantics, and is not
> really intuitive. Rightfully, the header-line should be excluded from
> the pixel Y coordinates.
No, I don't think there is any such "rightfully". Both behaviors are important
and useful (position within text area and position within total frame/window
including non-text decorations). We should not decide that one of them is
"right".
But each of them needs to be consistent.
> It's not feasible to change this for Emacs 23,
> since existing code might depend on the current behavior. But we can
> contemplate changing this in Emacs 24.
>
> (Such a change will not affect the picture-mouse-set-point fix.)
Let's contemplate coming up with functions that give both kinds of position, not
just one.
next prev parent reply other threads:[~2010-11-13 21:38 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-13 17:55 bug#7390: 24.0.50; pos-col-row gives incorrect row Drew Adams
2010-11-13 19:02 ` Eli Zaretskii
2010-11-13 19:17 ` Drew Adams
2010-11-13 21:10 ` Eli Zaretskii
2010-11-13 21:30 ` Eli Zaretskii
2010-11-13 21:37 ` Chong Yidong
2010-11-13 22:00 ` Eli Zaretskii
2010-11-16 19:59 ` Chong Yidong
2010-12-12 7:15 ` YAMAMOTO Mitsuharu
2010-12-12 7:29 ` Eli Zaretskii
2010-12-12 7:37 ` YAMAMOTO Mitsuharu
2010-12-12 20:47 ` Eli Zaretskii
2010-11-13 21:13 ` Chong Yidong
2010-11-13 21:21 ` Eli Zaretskii
2010-11-13 21:38 ` Drew Adams [this message]
2010-11-13 22:31 ` Eli Zaretskii
2010-11-13 21:44 ` Chong Yidong
2010-11-13 21:55 ` Eli Zaretskii
2010-11-14 17:35 ` Chong Yidong
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