From: Yuri Khan <yuri.v.khan@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
Subject: Re: How to determine (from Elisp) whether the Emacs frame has focus?
Date: Sat, 14 Nov 2015 16:54:35 +0600 [thread overview]
Message-ID: <CAP_d_8XL=DYyM1dsjP27m62EMp_Zsz-QxtLP0gET_LiipuPV9w@mail.gmail.com> (raw)
In-Reply-To: <83io55dkim.fsf@gnu.org>
On Sat, Nov 14, 2015 at 2:59 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>>
>> "Focus" in the window manager sense, not in Emacs sense. I.e., I want
>> to determine whether it is Emacs which receives keystrokes, or some
>> other X application.
>>
>> Hope that clarifies the question.
>
> Not really, sorry. The function selected-frame returns the frame that
> receives keystrokes, at least as far as I understand what you are
> saying. The ELisp manual explicitly says:
>
> -- Function: selected-frame
> This function returns the selected frame.
OK, simple demonstration.
I have a couple Emacs frames on my desktop, along with a Firefox and
an Xterm, all under the i3 window manager (but the concepts should
apply to any wm).
In one of the Emacs frames, I bring up *scratch* and type:
(progn (sit-for 3) (message "%s" (selected-frame)))
I press C-x C-e on that and wait for three seconds. It says: "#<frame
*scratch* – Emacs 0x1140678>".
Now I press C-x C-e again, and before three seconds elapse, I switch
the wm focus to Firefox. However, after three seconds, the minibuffer
says again: "#<frame *scratch* – Emacs #1140678>", although this frame
doesn’t have focus. Neither does any, in fact.
Now let’s imagine a situation where there is a single Emacs server,
and a couple of emacsclients connected to it, both displaying their
respective frames *on different X servers*. I believe in that setup
both frames could simultaneously have focus in their respective wms.
Which of them is “the” selected frame, from Emacs’ point of view?
next prev parent reply other threads:[~2015-11-14 10:54 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-13 21:45 How to determine (from Elisp) whether the Emacs frame has focus? Marcin Borkowski
2015-11-14 3:48 ` Emanuel Berg
2015-11-14 4:05 ` John Mastro
2015-11-14 7:30 ` tomas
2015-11-14 8:44 ` Marcin Borkowski
2015-11-14 10:45 ` tomas
2015-11-14 20:28 ` Marcin Borkowski
2015-11-14 8:06 ` Eli Zaretskii
2015-11-14 8:36 ` Random832
2015-11-14 9:36 ` Eli Zaretskii
2015-11-14 12:34 ` Marcin Borkowski
2015-11-14 13:40 ` Eli Zaretskii
2015-11-15 7:45 ` Marcin Borkowski
2015-11-15 19:45 ` Eli Zaretskii
2015-11-16 14:08 ` Nicolas Richard
2015-11-16 16:58 ` Marcin Borkowski
2015-11-14 21:10 ` Stefan Monnier
2015-11-16 17:00 ` Marcin Borkowski
2015-11-14 8:42 ` Marcin Borkowski
2015-11-14 8:59 ` Eli Zaretskii
2015-11-14 10:54 ` Yuri Khan [this message]
2015-11-14 11:04 ` Eli Zaretskii
2015-11-14 8:44 ` Michael Heerdegen
2015-11-14 10:15 ` Marcin Borkowski
[not found] <mailman.2293.1447451126.7904.help-gnu-emacs@gnu.org>
2015-11-16 6:53 ` Dan Espen
2015-11-17 0:10 ` Emanuel Berg
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