From: Vladimir Kazanov <vekazanov@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: [PATCH] User-defined fringe tooltips (a request for review)
Date: Tue, 26 Mar 2024 22:16:02 +0000 [thread overview]
Message-ID: <CAAs=0-1JKV5GVzk6_s6eFogyJccKBvjyxxnzf7K5Lb1BFiHxbQ@mail.gmail.com> (raw)
In-Reply-To: <86frwejkxe.fsf@gnu.org>
Hey,
I just did a deep dive into the code again - looking for a cleaner solution.
> The condition is only evaluated at glyph generation time, as for any
> other display property. When the tooltip should be displayed, the
> condition is not relevant, since if it were false when the glyphs were
> generated, you wouldn't have had the fringe bitmap shown in the first
> place.
>
> However, I think there's an easy way of making the implementation
> easier: just introduce a new overlay property called, say,
> fringe-help-echo, and put that property on the same text as the
> display property which produces the fringe. Then the code in
> note_fringe_highlight should simply check if the text which yielded
> the fringe bitmap also has this special property on it, and if so,
> display the tooltip.
Maybe an even easier solution would work:
1. Record buffer position of the fringe display spec in struct it.
Then move it to glyph_row the same way user_fringe_bitmap_id's are
copied over. It is just a ptrdiff so nothing out of place for
glyph_rows.
2. In note_fringe_highlight it becomes easy to retrieve the fringe
display spec using a single call to get_char_property_and_overlay(),
no need to iterate over a line, or have the implementation detail leak
into text properties.
What I don't really understand is whether I should handle overlays
with after-string/before-string properties. Overlays can contain
strings propertized with fringe display specs as well. In fact, there
is an example showing this trick in the manual
(https://www.gnu.org/software/emacs/manual/html_node/elisp/Fringe-Bitmaps.html).
Should I just go through all overlays touching the spec position and
parse into the after-string/before-string as well?
Pardon the many questions, display code has many moving parts.
Thank you
--
Regards,
Vladimir Kazanov
next prev parent reply other threads:[~2024-03-26 22:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-19 19:38 [PATCH] User-defined fringe tooltips (a request for review) Vladimir Kazanov
2023-12-20 12:31 ` Eli Zaretskii
2023-12-21 16:51 ` Vladimir Kazanov
2023-12-21 17:37 ` Eli Zaretskii
2023-12-23 13:28 ` Vladimir Kazanov
2023-12-23 13:40 ` Eli Zaretskii
2023-12-24 11:31 ` Vladimir Kazanov
2023-12-24 16:54 ` Eli Zaretskii
2024-03-25 15:55 ` Vladimir Kazanov
2024-03-25 17:11 ` Eli Zaretskii
2024-03-26 22:16 ` Vladimir Kazanov [this message]
2024-03-27 10:59 ` Vladimir Kazanov
2024-03-27 11:25 ` Po Lu
2024-03-27 12:48 ` Vladimir Kazanov
2024-03-27 11:25 ` Po Lu
2024-03-31 8:36 ` Eli Zaretskii
2024-04-07 11:14 ` Vladimir Kazanov
2024-04-07 12:44 ` Eli Zaretskii
2024-04-07 17:07 ` Vladimir Kazanov
2024-04-07 18:40 ` Eli Zaretskii
2024-04-08 14:41 ` Vladimir Kazanov
2024-04-13 9:14 ` Eli Zaretskii
2024-04-13 9:32 ` Vladimir Kazanov
2024-04-13 11:21 ` Eli Zaretskii
2024-04-13 14:53 ` Vladimir Kazanov
2024-04-13 15:47 ` Eli Zaretskii
2024-03-27 12:14 ` Eli Zaretskii
2024-03-27 12:48 ` Vladimir Kazanov
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