From: Po Lu <Luangruo@yahoo.com>
To: emacs-devel@gnu.org, Konstantin Kharlamov <hi-angel@yandex.ru>,
Eli Zaretskii <eliz@gnu.org>,
Ag Ibragimov <agzam.ibragimov@gmail.com>
Subject: Re: Regarding on-key-up event
Date: Sat, 04 Feb 2023 08:18:54 +0800 [thread overview]
Message-ID: <C46E309C-6738-4A06-B531-28D19380760B@yahoo.com> (raw)
In-Reply-To: <f6e921cc0bfd9a22fb084bfe9c28e647db09dc0f.camel@yandex.ru>
This nice behavior may be guaranteed by a keyboard itself, but not by input methods, where it is actually impossible to match up an input method's committed key events with a corresponding key release event.
Of course, since the input method is not operating synchronously wrt the X connection, there is not even the guarantee that the key release arrives after the key press, since the latter are not filtered through it. And for good reason; imagine that the input method commits a string, abcdef, and Emacs generates one key event for each character.
Which key release events should Emacs then deliver?
On February 4, 2023 5:47:14 AM GMT+08:00, Konstantin Kharlamov <hi-angel@yandex.ru> wrote:
>On Fri, 2023-02-03 at 21:39 +0200, Eli Zaretskii wrote:
>>
>> While you hold a key, a typical keyboard auto-repeats, so I see no
>> problem here.
>
>I am not aware of any keyboard that repeats its events upon holding a key.
>Repetition is usually implemented in a toolkit handling key events. A keyboard
>typically sends a single "pressed" event, and then after you done holding a key
>it sends a "released" event.
>
>Here's a proof: I run `libinput debug-events --verbose`, then hold `j`:
>
> $ libinput debug-events --verbose
> […]
> -event6 KEYBOARD_KEY +0.000s *** (-1) pressed
> jjjjjjjjjjjjjjjjjj event6 KEYBOARD_KEY +1.280s *** (-1)
>released
> […]
>
>See, there are repeating `j` on the screen, but it's created by the Qt toolkit
>of my Konsole terminal. Keyboard sent only 2 events: `pressed` and `released`.
>
next prev parent reply other threads:[~2023-02-04 0:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-03 17:31 Regarding on-key-up event Ag Ibragimov
2023-02-03 18:18 ` Eli Zaretskii
2023-02-03 19:25 ` Ag Ibragimov
2023-02-03 19:39 ` Eli Zaretskii
2023-02-03 21:47 ` Konstantin Kharlamov
2023-02-03 22:05 ` Konstantin Kharlamov
2023-02-04 0:18 ` Po Lu [this message]
2023-02-04 0:48 ` Ag Ibragimov
2023-02-04 1:26 ` Po Lu
2023-02-04 7:07 ` Eli Zaretskii
2023-02-03 23:45 ` Ag Ibragimov
2023-02-04 0:34 ` Po Lu
2023-02-04 7:09 ` Eli Zaretskii
2023-02-04 15:47 ` chad
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