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From: Eli Zaretskii <eliz@gnu.org>
To: Po Lu <luangruo@yahoo.com>
Cc: larsi@gnus.org, monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: Touchscreen support
Date: Sun, 19 Dec 2021 11:32:40 +0200	[thread overview]
Message-ID: <83y24h7xdz.fsf@gnu.org> (raw)
In-Reply-To: <8735mp9cch.fsf@yahoo.com> (message from Po Lu on Sun, 19 Dec 2021 17:24:14 +0800)

> From: Po Lu <luangruo@yahoo.com>
> Cc: larsi@gnus.org,  monnier@iro.umontreal.ca,  emacs-devel@gnu.org
> Date: Sun, 19 Dec 2021 17:24:14 +0800
> 
> > In any case, it makes no sense to me to "decompose" events that are
> > already composed into meaningful gestures.  We should be able to use
> > those higher-level abstractions when they are provided.
> 
> The difference is that those higher-level abstractions vary too much for
> us to abstract around usefully.  (The GTK one is also very painful, for
> unrelated reasons.)  I think that's why Mozilla Firefox and other
> cross-platform programs that have to handle touch events rely on their
> own machinery for this stuff opposed to the platform-provided one.

We'd need to try to find some scheme that provides equivalence between
the different abstractions.  I don't understand how could it be too
hard, since the gestures are very similar, if not identical.

Which higher-level gestures did you intend to support?  The MS-Windows
classification has this list:

  . zoom
  . pan
  . rotate
  . two-finger tap
  . press and tap

Which other gestures did you have in mind?

> We would have to limit ourselves to only handling tap events and only
> sending them when the finger is lifted, if we were to rely on the lowest
> common denominator of all those different abstractions.

I see no reason to limit ourselves to the lowest common denominator.



  reply	other threads:[~2021-12-19  9:32 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <87czlxkntg.fsf.ref@yahoo.com>
2021-12-16  7:31 ` Touchscreen support Po Lu via Emacs development discussions.
2021-12-16  7:58   ` Lars Ingebrigtsen
2021-12-16  8:02     ` Po Lu
2021-12-17  6:19   ` Po Lu
2021-12-17  7:17     ` Lars Ingebrigtsen
2021-12-17 12:29     ` Stefan Monnier
2021-12-17 12:36       ` Po Lu
2021-12-17 13:18         ` Stefan Monnier
2021-12-17 13:48           ` Po Lu
2021-12-17 16:00             ` Stefan Monnier
2021-12-18  0:02               ` Po Lu
2021-12-18 16:22                 ` Stefan Monnier
2021-12-18 19:12                   ` Stefan Monnier
2021-12-18  4:41             ` Richard Stallman
2021-12-18  4:53               ` Po Lu
2021-12-20  4:42                 ` Richard Stallman
2021-12-20  4:59                   ` Po Lu
2021-12-21  4:15                     ` Richard Stallman
2021-12-21  4:35                       ` Po Lu
2021-12-22  4:16                         ` Richard Stallman
2021-12-22  4:39                           ` Po Lu
2021-12-23  3:43                             ` Richard Stallman
2021-12-23  4:46                               ` Po Lu
2021-12-26  3:57                                 ` Richard Stallman
2021-12-26  5:02                                   ` Po Lu
2021-12-27  4:14                                     ` Richard Stallman
2021-12-27  6:05                                       ` Stefan Monnier
2021-12-28  4:19                                         ` Richard Stallman
2022-01-15  0:17                                       ` chad
2022-01-15  0:48                                         ` Po Lu
2022-01-16  5:07                                         ` Richard Stallman
2022-01-16  5:35                                           ` Po Lu
2021-12-18  7:48           ` Lars Ingebrigtsen
2021-12-18 14:46             ` Eli Zaretskii
2021-12-19  0:24               ` Po Lu
2021-12-19  8:14                 ` Eli Zaretskii
2021-12-19  9:24                   ` Po Lu
2021-12-19  9:32                     ` Eli Zaretskii [this message]
2021-12-19  9:38                       ` Po Lu
2021-12-19 11:31                         ` Eli Zaretskii
2021-12-19 11:42                           ` Po Lu
2021-12-19 17:58                             ` Eli Zaretskii
2021-12-20  0:54                               ` Po Lu
2021-12-20 15:18                                 ` Eli Zaretskii
2021-12-21  1:08                                   ` Po Lu
2021-12-21 12:11                                     ` Eli Zaretskii
2021-12-21 12:21                                       ` Po Lu
2021-12-21 14:17                                         ` Eli Zaretskii
2021-12-19 18:26                       ` [External] : " Drew Adams
2021-12-20  4:42             ` Richard Stallman

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