From: Marcin Borkowski <mbork@mbork.pl>
To: Eli Zaretskii <eliz@gnu.org>
Cc: help-gnu-emacs@gnu.org
Subject: Re: How to temporarily show an image in an Emacs buffer?
Date: Wed, 08 Mar 2023 17:00:11 +0100 [thread overview]
Message-ID: <878rg7dyii.fsf@mbork.pl> (raw)
In-Reply-To: <835ybb5pn0.fsf@gnu.org>
On 2023-03-08, at 14:38, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Marcin Borkowski <mbork@mbork.pl>
>> Date: Wed, 08 Mar 2023 05:53:46 +0100
>>
>> I need to insert an image in the buffer in a way that doesn't interfere
>> with the undo mechanism. In other words, `insert-image' won't help me
>> because (as I understand it) it needs to insert a space or some other
>> string so that it can put display property on it. How to achieve this?
>
> You can put a display property on the existing text in the buffer
> without inserting any new text. See the node "Other Display
> Properties" in the ELisp manual, where it describes the
> ‘(image . IMAGE-PROPS)’ display property spec.
You're right, of course, but it's a bit more complex than that. Since
an overlay with the `image' property "hides" the text beneath it, the
key is to create an overlay with a `before-string' property whose value
is a dummy string (say, a space), and put the `image' /text/ property on
that very string. I did some experiments and it seems to work, though
I'll have a (hopefully) working prototype by the end of the week (no
more time for this today).
Thanks a lot! (Also, once I have it working, I will definitely describe
it on my blog; I may also copy it here if someone is interested.)
Best,
--
Marcin Borkowski
http://mbork.pl
next prev parent reply other threads:[~2023-03-08 16:00 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-08 4:53 How to temporarily show an image in an Emacs buffer? Marcin Borkowski
2023-03-08 5:23 ` Marcin Borkowski
2023-03-08 6:19 ` Ruijie Yu via Users list for the GNU Emacs text editor
2023-03-08 16:01 ` Marcin Borkowski
2023-03-08 16:41 ` Michael Heerdegen
2023-03-11 8:14 ` Marcin Borkowski
2023-03-12 3:37 ` Michael Heerdegen
2023-03-12 7:46 ` Marcin Borkowski
2023-03-08 13:38 ` Eli Zaretskii
2023-03-08 16:00 ` Marcin Borkowski [this message]
2023-03-13 8:29 ` Jean Louis
2023-03-13 9:27 ` Marcin Borkowski
2023-04-01 15:57 ` Marcin Borkowski
2023-03-10 16:26 ` Stefan Monnier via Users list for the GNU Emacs text editor
2023-03-11 8:15 ` Marcin Borkowski
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