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From: Po Lu <luangruo@yahoo.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: larsi@gnus.org,  monnier@iro.umontreal.ca,  emacs-devel@gnu.org
Subject: Re: Touchscreen support
Date: Sun, 19 Dec 2021 17:24:14 +0800	[thread overview]
Message-ID: <8735mp9cch.fsf@yahoo.com> (raw)
In-Reply-To: <834k759fkp.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 19 Dec 2021 10:14:30 +0200")

Eli Zaretskii <eliz@gnu.org> writes:

> If you do it in Lisp, it will be hard to use on other platforms, where
> the higher-level abstractions are reported on the level of the
> window-system events.

[...]

> I don't think so, although I'm far from being an expert.  I see it
> provides the gesture-begin and gesture-end events, but not
> gesture-update; instead, the "cooked" gestures are provided which are
> already constructed from lower-level events.  The MS documentation
> clearly says:
>
>   Note Most applications should ignore the GID_BEGIN and GID_END
>   messages and pass them to DefWindowProc. These messages are used by
>   the default gesture handler. Application behavior is undefined when
>   the GID_BEGIN and GID_END messages are consumed by a third-party
>   application.
>
> So they advise against using the low-level events.

> 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 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.



  reply	other threads:[~2021-12-19  9:24 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 [this message]
2021-12-19  9:32                     ` Eli Zaretskii
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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