From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org, miles@gnu.org
Subject: Re: Combining face and map stuff
Date: Wed, 13 Oct 2010 08:42:20 -0400 [thread overview]
Message-ID: <jwvhbgqqner.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1P5zhj-0003ju-FX@fencepost.gnu.org> (Eli Zaretskii's message of "Wed, 13 Oct 2010 07:41:07 -0400")
>> > Let's say we have a buffer, in which both package foo and package bar
>> > defined different faces for the same piece of text. Which one of them
>> > will be displayed, and how would the display engine know to choose it?
>>
>> Internally, one of them sets the property (foo . face) to <face1>, the
>> other one sets the property (bar . face) to <face2>, and when these are
>> set, the `face' property gets set to (<face1> <face2>). The display
>> engine only looks at the `face' property, just as before.
> So it's just a convenience feature, to avoid something like
> get existing text property value
> merge with another value
> put it back with add-text-property
> in every package?
Yes, tho it goes further than that, since the above steps still leave
some questions unanswered, e.g.:
- how to make sure all packages use the same "merge" function?
- how should a package remove its property values without also removing
the other packages's property values.
Stefan
prev parent reply other threads:[~2010-10-13 12:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-02 14:21 Combining face and map stuff Lars Magne Ingebrigtsen
2010-10-02 16:21 ` Chong Yidong
2010-10-02 16:41 ` Lars Magne Ingebrigtsen
2010-10-03 2:04 ` Miles Bader
2010-10-03 4:16 ` Chong Yidong
2010-10-03 13:08 ` Lars Magne Ingebrigtsen
2010-10-03 23:37 ` Stefan Monnier
2010-10-04 7:56 ` Eli Zaretskii
2010-10-04 9:03 ` Miles Bader
2010-10-04 9:42 ` Eli Zaretskii
2010-10-05 0:12 ` Miles Bader
2010-10-05 23:43 ` Stefan Monnier
2010-10-06 3:57 ` Eli Zaretskii
2010-10-07 7:40 ` Stefan Monnier
2010-10-07 13:56 ` Eli Zaretskii
2010-10-07 18:08 ` Stefan Monnier
2010-10-12 19:09 ` Eli Zaretskii
2010-10-12 20:23 ` Stefan Monnier
2010-10-13 11:41 ` Eli Zaretskii
2010-10-13 12:42 ` Stefan Monnier [this message]
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