GNU bug report logs - #74423
Low level key events

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Package: emacs; Severity: wishlist; Reported by: Cecilio Pardo <cpardo@HIDDEN>; dated Mon, 18 Nov 2024 20:36:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Stefan Monnier <monnier@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
Subject: Re: bug#74423: Low level key events
In-Reply-To: <e8833e75-c05f-43e2-81b4-464b9236211d@HIDDEN> (Cecilio
 Pardo's message of "Thu, 2 Jan 2025 16:42:34 +0100")
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> In this new version I changed the way events are handled.
> Now llk-handle generates input events to be used with normal
> keymaps, instead of running a command. The function llk-bind
> activates event generation for a key and a combination of
> events press, release, double, triple.

I really like what I see.  As I think I mentioned, I had made a related
effort in local patches, but I couldn't figure out back then how to make
the low-level events useful.

I wouldn't be surprised if such low-level events remain limited in their
use, but I suspect that some specific uses of them could become very
popular.

I haven't seen many opinions of late on your code (other than my
own), sadly.  I think we need some more reviewers here.

> You suggested to auto generate the keysym table, but we
> would still need a table to relate the Windows keys to the X
> equivalent.

I don't doubt some part has to be done manually, but I think we should
strive to make it via code as much as possible.

E.g. on each platform we should try to provide a programmatic way to map
the integer key to/from a meaningful system-specific string or symbol
(at least, to the extent that the underlying system provides such
a functionality).

Mapping between those symbols in different systems will likely be (at
least partly) manual, inevitably, but I'm hoping this can be
significantly smaller (especially I'm hoping we can "align" the
system-specific symbols such that many are already identical between the
different systems).

Finally it's not 100% indispensable to have unified symbols that work
identically on all systems: users could also just use the system-specific
names.  They'd need a mapping between them only for code/configuration
that is used with different systems.  So it's only really important when
those names start to be used in libraries.

> +@cindex @code{low-level-key} event
> +@item (low-level-key @var{is-key-press} @var{key} @var{modifier} @var{time} @var{frame})
> +This event is sent on the physical press or release of keys, only on
> +systems where it is supported, currently X, MS-Windows and PGTK, and
> +only if the variable @code{enable-low-level-key-events} has a
> +non-@code{nil} value.  See its documentation for the values to use, that
> +can activate the events for all or some keys.
> +
> +@var{is-key-press} is @code{t} for a key press, @code{nil} for a key
> +release.  @var{time} is the event's time in milliseconds, as reported by
> +the underlying platform, and should only be used to measure time
> +intervals between events of this same kind.

[ This made me wonder if those timestamps can be compared between
  events coming from different X11 servers.  ]

> @var{frame} is the frame +receiving the event.

Any chance this could be changed to a window?
[ What does it even mean?
  Usually we associate keyboard events with the `window-point` of the
  currently selected window (and they don't come with the information
  attached), whereas we associated mouse events with the
  position of the mouse cursor.
  But when I do `down-meta down-mouse-1 up-mouse-1 up-meta` to generate
  a `M-mouse-1` event, the events on the `meta` key end up associated
  with the position of the mouse cursor even tho they come from
  the keyboard.  ]

> @var{modifier} is @code{nil} if the key is not a
> +modifier key, @code{t} if it is, but it is unknown which one, or one of
> +@code{shift}, @code{control}, @code{meta}, @code{alt}, @code{super},
> +@code{hyper}.

In the docstring you mention that PGTK can't distinguish modifiers.
It would be useful here to mention here also the kinds of reasons why we
might get just `t`: can it happen for some keys and not others, or is it
the case for all the events of a given kind of terminal?

> Loading @file{low-level-key.el} sets a handler
> +that can generate normal input events for key press, release and multi
> +tap.  See the function @code{llk-bind}.

Any other ELisp code could do a similar task, tho.  So, I'd probably
present it a bit differently, like:

    Because generating these events for all keys would interfere with
    normal keyboard input, they are by default filtered out by a binding in
    `special-event-map`.
    @file{low-level-key.el} is a package that lets you configure
    which of those events to turn into normal input events.  It is also
    able to recognize some specific patterns such a (multi) taps.

[ BTW, you might like to explain what is a (multi) tap here, as well.  ]

> +(cl-defstruct (low-level-key (:type list))

I recommend you add `(:constructor nil)` and `(:copier nil)` so the
macro doesn't auto-define `make-low-level-key` and
`copy-low-level-key` functions.

> +(defvar llk-bindings nil
> +  "List of bindings for low level key events (press/release/tap).
> +Use the `llk-bind' function to add bindings.  See its documentation for
> +a description of the binding information.")

[ Seeing how it's used, I suggest you use a hash-table instead of
  a list.  ]

> +EVENTS are symbols that activate one event. Possible values are `press',
> +`release', `double' and `triple'.

Any reason why there isn't an option to emit an event for a single
press+release?

> +  (llk-bind xk-shift-l \\='double)
> +
> +will generate the event `double-xk-shift-l', than can be bound to a
> +command with:

AFAICT the event will be named `double-key-xk-shift-l`.
Did I miss something?
[ I like this "key-" in the event name, FWIW, so I suggest to keep the
  code but fix the doc rather than the reverse.  Tho, if we can drop
  the `xk-`, I'd be happier yet.
  Maybe the generated event names should have "llk-" in them
  instead of "key-".  ]

> +(defun describe-low-level-key ()
> +  "Wait for key press and describe the low-level key event it generates."
> +  (interactive)
> +  (define-key special-event-map [low-level-key] 'llk--describe))

This is brittle.  I don't really have a better suggestion, sadly, but it
deserves a comment.

> +(setq llk-bindings nil)

Why?

Also the file lacks the usual end of file marker (and the call to `provide`).

I'll try and take a look at the C code later.


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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Subject: Re: bug#74423: Low level key events
To: Stefan Monnier <monnier@HIDDEN>
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Hello,

In this new version I changed the way events are handled.
Now llk-handle generates input events to be used with normal
keymaps, instead of running a command. The function llk-bind
activates event generation for a key and a combination of
events press, release, double, triple.

I also made changes following your notes, such as:

- Clarification on the event's time, documentation of
   keysyms variables moved, don't limit to GUI systems.
- cl-defstruct for the event payload.
- Format and naming conventions.
- Default timeout to mouse double click timeout.

You suggested to auto generate the keysym table, but we
would still need a table to relate the Windows keys to the X
equivalent.

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--------------eNHcmXNQvtsRN3BsZgn4RNX3--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Severity set to 'wishlist' from 'normal' Request was from Stefan Kangas <stefankangas@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 74423 <at> debbugs.gnu.org:

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From: Stefan Monnier <monnier@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
Subject: Re: bug#74423: Low level key events
In-Reply-To: <b3e7839a-3fac-49e4-a507-fc34f6a71aa4@HIDDEN> (Cecilio
 Pardo's message of "Thu, 26 Dec 2024 11:16:11 +0100")
Message-ID: <jwved1ucxgi.fsf-monnier+emacs@HIDDEN>
References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
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> How can we make sure that only the user configures this, and external
> packages do not?

I can't think of a good reason why we would actively want to prevent
external packages from touching this.  At least not via technical means.

As a matter of fact, I think we'd welcome packages dedicated to
configuring this: your code is currently layered as a C part which
provides the low-level events and an ELisp part which constructs useful
semantics out of it, but that ELisp part can be thought of as a separate
package, so we already have an example of useful "external" package
configuring this.  Another package could provide an alternative way to
use those low-level events.

As for "normal" packages (say major modes), I suspect they will tend to
naturally refrain from touching it because it's not
available everywhere.

We may document guidelines about those low-level events alongside our
conventions for key bindings, OTOH.


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Message received at 74423 <at> debbugs.gnu.org:

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Subject: Re: bug#74423: Low level key events
To: Stefan Monnier <monnier@HIDDEN>
References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
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On 22/12/2024 5:31, Stefan Monnier wrote:

> I'm not expert in the C level part of that code, so I provide
> feedback below only for the Lisp-facing part.

Thanks a lot for the review.  I'm working on it.

> Maybe instead of focusing on running a command, `llk-handle` and
> `llk-bind` should concentrate on generating "normal" events that are
> then looked up in the normal keymaps.
> 
> So the user would use them only to specify which events should be
> recognized and which should be ignored.  Then the user can use the
> standard keymaps to declare what to do in response to `double-xk-shift-l`.
> WDYT?

Yes, I think that's better.  I did it the other way to keep it as 
separate as possible from normal events, as some people thought this was 
a bad idea.

How can we make sure that only the user configures this, and external 
packages do not?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
Subject: Re: bug#74423: Low level key events
In-Reply-To: <343e2854-a16e-4718-894a-470b733ae91f@HIDDEN> (Cecilio
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Hi, this is shaping up quite nicely, AFAICT.
I'm not expert in the C level part of that code, so I provide
feedback below only for the Lisp-facing part.


        Stefan


> --- a/doc/lispref/commands.texi
> +++ b/doc/lispref/commands.texi
> @@ -2658,6 +2658,38 @@ Misc Events
>  respectively.  They are usually interpreted as being relative to the
>  size of the object beneath the gesture: image, window, etc.
>  
> +@cindex @code{low-level-key} event
> +@item (low-level-key @var{is-key-press} @var{key} @var{modifier} @var{time} @var{frame})
> +This event is sent on the physical press or release of keys, only on GUI
> +systems, currently X, MS-Windows and PGTK, and only if the variable
> +@code{enable-low-level-key-events} has a non-@code{nil} value.  See its
> +documentation for the values it can take, that allow to filter which
> +keys should generate this kind of event.

Rather than saying it's sent "only on GUI systems", I'd say sent "only
on systems where it is supported": I wouldn't be surprised to hear that
some terminal emulators offer ways to support it.

> +@var{is-key-press} is @code{t} for a key press, @code{nil} for a key release.
> +@var{time} is the event's time in milliseconds, @var{frame} is the
> +frame receiving it.

Please clarify the origin of the event's time (or if possible make it
a valid/normal Emacs time object).

> +@var{key}, an integer, identifies the key pressed or released.  This
> +number is platform dependent, but there are variables for most keys that
> +can be used in place of the numbers to identify them.  For example, the
> +variable @code{xk-backspace} identifies the @key{backspace} key.

I get the impression that those variables/constants may be
replaced/complemented in the future with alternatives, such as functions
that convert the key number to a symbol, or functions that test whether
the key number is within some set of keys described as symbols, ...
So the documentation of the meaning of those key numbers via associated
variables/constants should probably be placed elsewhere.

> +These variables are initialized by calling the function @code{llk-init}.
> +This function also binds a handler to this event, which allows to detect

[ "Allow" is transitive, so you need to say "allows us" or "allows users"
  or something like (or use some other formulation altogether).  ]

> --- /dev/null
> +++ b/lisp/low-level-key.el
> @@ -0,0 +1,342 @@
> +;;; -*- lexical-binding: t -*-

Please follow our convention for the first line of ELisp files, and then
include our usual copyright+license blurb.

> +;; The physical-key event is like this:
> +;; (low-level-key IS-KEY-PRESS KEY MODIFIER TIME FRAME)

> +;; IS-KEY-PRESS is t if the key has been pressed, nil if it has been released.
> +;; KEY is the keysym number.
> +;; MODIFIER is the modifier associated with this key.  It is nil if the key is
> +;; not a modifier.  It can be one of the following symbols: shift, control, meta,
> +;; super, hyper, alt.  It can also be t if the key is a modifier but it can't be
> +;; identified, as in the PGTK backend.
> +;; TIME is the timestamp in milliseconds of the event.
> +;; FRAME is the frame where the event happened.

I suggest you replace that text with a `cl-defstruct` (where you can
include the same information but in a way that's available via
`cl-describe-type`).  And then you can stop using `cl-third` and use
proper accessors instead.

> +(defvar llk-bindings nil
> +  "List of bindings for low level key events (press/release/tap).
> +
> +Use the `llk-bind' function to add bindings.  See its documentation for
> +a description of the binding information.")

AFAICT this is a list of elements of the form `(tab KEY FUNCTION)`.
Why not drop the `tap` and make it a "normal" keymap?

> +(defvar llk-tap-count 2
> +  "Number or key press/releases to consider a tap.")

Shouldn't `llk-tap-count` be specified individually for each binding?

> +(defvar llk-tap-timeout 1000
> +  "Time (ms) between consecutive key presses/releases to consider a tap.")

Default it to `mouse-double-click-time` (and maybe double it for triple
taps)?

> +(defvar llk-tap-keys
> +  '(xk-shift-l xk-shift-r xk-control-l xk-control-r meta)
> +  "Keys that can generate taps.")

This seems redundant with `llk-bindings`.

> +(defvar llk-describe-next-press nil
> +  "Internal variable to mark that next key press should be described.")

Use a "--" in the var's name for internal variables.

> +(defmacro define-xk (name x-keysym w32-keysym)
> +  "Internal macro to define keysyms."

Same thing for macros.

> +  `(let ((ksym (pcase (window-system)
> +                 ('pgtk ,x-keysym)
> +                 ('x ,x-keysym)
> +                 ('w32 ,w32-keysym))))

You can combine the first two branches into:

                    ((or 'pgtk 'x) ,x-keysym)

> +  ;; tty keys
> +  (define-xk xk-backspace   #xff08 #x08) ;; XK_BackSpace VK_BACK
> +  (define-xk xk-tab         #xff09 #x09) ;; XK_Tab VK_TAB
> +  (define-xk xk-clear       #xff0b #x0C) ;; XK_Clear VK_CLEAR
> +  (define-xk xk-return      #xff0d #x0D) ;; XK_Return VK_RETURN
> +  (define-xk xk-pause       #xff13 #x13) ;; XK_Pause VK_PAUSE
> +  (define-xk xk-scroll-lock #xff14 #x91) ;; XK_Scroll_Lock VK_SCROLL
> +  (define-xk xk-escape      #xff1B #x1B) ;; XK_Escape VK_ESCAPE
> +  (define-xk xk-delete      #xffff #x2E) ;; XK_Delete VK_DELETE
> +
> +  ;; Cursor control and motion
> +  (define-xk xk-home        #xff50 #x24) ;; XK_Home VK_HOME
> +  (define-xk xk-left        #xff51 #x25) ;; XK_Left VK_LEFT
> +  (define-xk xk-up          #xff52 #x26) ;; XK_Up VK_UP
> +  (define-xk xk-right       #xff53 #x27) ;; XK_Right VK_RIGHT
> +  (define-xk xk-down        #xff54 #x28) ;; XK_Down VK_DOWN
> +  (define-xk xk-page-up     #xff55 #x21) ;; XK_Page_Up VK_PRIOR
> +  (define-xk xk-page-down   #xff56 #x22) ;; XK_Page_Down VK_NEXT
> +  (define-xk xk-end         #xff57 #x23) ;; XK_End VK_END
> +  (define-xk xk-begin       #xff58 #x24) ;; XK_Begin VK_HOME
> +
> +  ;; Special Windows keyboard keys
> +  (define-xk xk-win-l       #xFF5B #x5B) ;; XK_Win_L VK_LWIN
> +  (define-xk xk-win-r       #xFF5C #x5C) ;; XK_Win_R VK_RWIN
> +  (define-xk xk-app         #xFF5D #x5D) ;; XK_App VK_APPS
> +
> +  ;; Misc functions
> +  (define-xk xk-select      #xff60 #x29) ;; XK_Select VK_SELECT
> +  (define-xk xk-print       #xff61 #x2A) ;; XK_Print VK_PRINT
> +  (define-xk xk-insert      #xff64 #x2D) ;; XK_Insert VK_INSERT
> +  (define-xk xk-num-lock    #xff7f #x90) ;; XK_Num_Lock VK_NUMLOCK
> +
> +  ;; Keypad
> +  ;; TODO: Check values for MS-Windows
> +  (define-xk xk-kp-enter    #xff8d nil) ;; XK_KP_Enter ???
> +  (define-xk xk-kp-multiply #xffaa nil) ;; XK_KP_Multiply ???
> +  (define-xk xk-kp-add      #xffab nil) ;; XK_KP_Add ???
> +  (define-xk xk-kp-subtract #xffad nil) ;; XK_KP_Subtract ???
> +  (define-xk xk-kp-decimal  #xffae nil) ;; XK_KP_Decimal ???
> +  (define-xk xk-kp-divide   #xffaf nil) ;; XK_KP_Divide ???
> +  (define-xk xk-kp-0        #xffb0 #x60) ;; XK_KP_0 VK_NUMPAD0
> +  (define-xk xk-kp-1        #xffb1 #x61) ;; XK_KP_1 VK_NUMPAD1
> +  (define-xk xk-kp-2        #xffb2 #x62) ;; XK_KP_2 VK_NUMPAD2
> +  (define-xk xk-kp-3        #xffb3 #x63) ;; XK_KP_3 VK_NUMPAD3
> +  (define-xk xk-kp-4        #xffb4 #x64) ;; XK_KP_4 VK_NUMPAD4
> +  (define-xk xk-kp-5        #xffb5 #x65) ;; XK_KP_5 VK_NUMPAD5
> +  (define-xk xk-kp-6        #xffb6 #x66) ;; XK_KP_6 VK_NUMPAD6
> +  (define-xk xk-kp-7        #xffb7 #x67) ;; XK_KP_7 VK_NUMPAD7
> +  (define-xk xk-kp-8        #xffb8 #x68) ;; XK_KP_8 VK_NUMPAD8
> +  (define-xk xk-kp-9        #xffb9 #x69) ;; XK_KP_9 VK_NUMPAD9
> +
> +  ;; Function keys
> +  (define-xk xk-f1          #xffbe #x70) ;; XK_F1 VK_F1
> +  (define-xk xk-f2          #xffbf #x71) ;; XK_F2 VK_F2
> +  (define-xk xk-f3          #xffc0 #x72) ;; XK_F3 VK_F3
> +  (define-xk xk-f4          #xffc1 #x73) ;; XK_F4 VK_F4
> +  (define-xk xk-f5          #xffc2 #x74) ;; XK_F5 VK_F5
> +  (define-xk xk-f6          #xffc3 #x75) ;; XK_F6 VK_F6
> +  (define-xk xk-f7          #xffc4 #x76) ;; XK_F7 VK_F7
> +  (define-xk xk-f8          #xffc5 #x77) ;; XK_F8 VK_F8
> +  (define-xk xk-f9          #xffc6 #x78) ;; XK_F9 VK_F9
> +  (define-xk xk-f10         #xffc7 #x79) ;; XK_F10 VK_F10
> +  (define-xk xk-f11         #xffc8 #x7A) ;; XK_F11 VK_F11
> +  (define-xk xk-f12         #xffc9 #x7B) ;; XK_F12 VK_F12
> +  (define-xk xk-f13         #xffca #x7C) ;; XK_F13 VK_F13
> +  (define-xk xk-f14         #xffcb #x7D) ;; XK_F14 VK_F14
> +  (define-xk xk-f15         #xffcc #x7E) ;; XK_F15 VK_F15
> +  (define-xk xk-f16         #xffcd #x7F) ;; XK_F16 VK_F16
> +  (define-xk xk-f17         #xffce #x80) ;; XK_F17 VK_F17
> +  (define-xk xk-f18         #xffcf #x81) ;; XK_F18 VK_F18
> +  (define-xk xk-f19         #xffd0 #x82) ;; XK_F19 VK_F19
> +  (define-xk xk-f20         #xffd1 #x83) ;; XK_F20 VK_F20
> +  (define-xk xk-f21         #xffd2 #x84) ;; XK_F21 VK_F21
> +  (define-xk xk-f22         #xffd3 #x85) ;; XK_F22 VK_F22
> +  (define-xk xk-f23         #xffd4 #x86) ;; XK_F23 VK_F23
> +  (define-xk xk-f24         #xffd5 #x87) ;; XK_F24 VK_F24
> +
> +  ;; Modifier keys
> +  (define-xk xk-shift-l     #xffe1 #xA0) ;; XK_Shift_L VK_LSHIFT
> +  (define-xk xk-shift-r     #xffe2 #xA1) ;; XK_Shift_R VK_RSHIFT
> +  (define-xk xk-control-l   #xffe3 #xA2) ;; XK_Control_L VK_LCONTROL
> +  (define-xk xk-control-r   #xffe4 #xA3) ;; XK_Control_R VK_RCONTROL
> +  (define-xk xk-caps-lock   #xffe5 #x14) ;; XK_Caps_Lock VK_CAPITAL
> +  (define-xk xk-metal-l     #xffe7 nil) ;; XK_Meta_L
> +  (define-xk xk-metal-t     #xffee nil) ;; XK_Meta_R
> +  (define-xk xk-alt-l       #xffe9 #xA4) ;; XK_Alt_L VK_LMENU
> +  (define-xk xk-alt-r       #xffea #xA5) ;; XK_Alt_R VK_RMENU
> +  (define-xk xk-super-l     #xffeb nil) ;; XK_Super_L
> +  (define-xk xk-super-r     #xffec nil) ;; XK_Super_R
> +  (define-xk xk-hyper-l     #xffed nil) ;; XK_Hyper_L
> +  (define-xk xk-hyper-r     #xffee nil) ;; XK_Hyper_R
> +
> +  ;; Latin 1
> +  ;; For numbers and letters, MS-Windows does not define constant names.
> +  ;; X11 defines distinct keysyms for lowercase and uppercase
> +  ;; letters.  We use only the uppercase ones.  Events with lowercase
> +  ;; letters are converted to uppercase.
> +  (define-xk xk-space       #x0020 #x20) ;; XK_space VK_SPACE
> +  (define-xk xk-0           #x0030 #x30) ;; XK_0
> +  (define-xk xk-1           #x0031 #x31) ;; XK_1
> +  (define-xk xk-2           #x0032 #x32) ;; XK_2
> +  (define-xk xk-3           #x0033 #x33) ;; XK_3
> +  (define-xk xk-4           #x0034 #x34) ;; XK_4
> +  (define-xk xk-5           #x0035 #x35) ;; XK_5
> +  (define-xk xk-6           #x0036 #x36) ;; XK_6
> +  (define-xk xk-7           #x0037 #x37) ;; XK_7
> +  (define-xk xk-8           #x0038 #x38) ;; XK_8
> +  (define-xk xk-9           #x0039 #x39) ;; XK_9
> +  (define-xk xk-a           #x0041 #x41) ;; XK_A
> +  (define-xk xk-b           #x0042 #x42) ;; XK_B
> +  (define-xk xk-c           #x0043 #x43) ;; XK_C
> +  (define-xk xk-d           #x0044 #x44) ;; XK_D
> +  (define-xk xk-e           #x0045 #x45) ;; XK_E
> +  (define-xk xk-f           #x0046 #x46) ;; XK_F
> +  (define-xk xk-g           #x0047 #x47) ;; XK_G
> +  (define-xk xk-h           #x0048 #x48) ;; XK_H
> +  (define-xk xk-i           #x0049 #x49) ;; XK_I
> +  (define-xk xk-j           #x004A #x4A) ;; XK_J
> +  (define-xk xk-k           #x004B #x4B) ;; XK_K
> +  (define-xk xk-l           #x004C #x4C) ;; XK_L
> +  (define-xk xk-m           #x004D #x4D) ;; XK_M
> +  (define-xk xk-n           #x004E #x4E) ;; XK_N
> +  (define-xk xk-o           #x004F #x4F) ;; XK_O
> +  (define-xk xk-p           #x0050 #x50) ;; XK_P
> +  (define-xk xk-q           #x0051 #x51) ;; XK_Q
> +  (define-xk xk-r           #x0052 #x52) ;; XK_R
> +  (define-xk xk-s           #x0053 #x53) ;; XK_S
> +  (define-xk xk-t           #x0054 #x54) ;; XK_T
> +  (define-xk xk-u           #x0055 #x55) ;; XK_U
> +  (define-xk xk-v           #x0056 #x56) ;; XK_V
> +  (define-xk xk-w           #x0057 #x57) ;; XK_W
> +  (define-xk xk-x           #x0058 #x58) ;; XK_X
> +  (define-xk xk-y           #x0059 #x59) ;; XK_Y
> +  (define-xk xk-z           #x005A #x5A));; XK_Z

These tables should be somehow auto-generated, IMO.

> +(defun llk-init ()
> +  "Initialize low level key events.
> +
> +Fills the `llk-keysyms' list, and binds the `low-level-key' event
> +to the `llk-handle' function.  Resets the `llk-bindings' list.
> +Besides calling this function, you need to set `enable-low-level-key-events'
> +to a non-nil value."

Does the user need to know about those things it does?
Would there be any harm to call it automatically when the package is
loaded, or the first time `llk-bind` is called?  IOW, please try and
make it unnecessary for the caller to know and call this function (and
then make it internal with a "--" in its name).

> +  (interactive)

Why interactive?

> +(defsubst event-is-key-press (event)
> +  "Return the value of the IS-KEY-PRESS field of the EVENT, a low level key event."
> +  (declare (side-effect-free t))
> +  (if (consp event) (nth 1 event)))
> +
> +(defsubst event-keysym (event)
> +  "Return the value of the KEY field of the EVENT, a low level key event."
> +  (declare (side-effect-free t))
> +  (if (consp event) (nth 2 event)))
> +
> +(defsubst event-modifier (event)
> +  "Return the value of the MODIFIER field of the EVENT, a low level key event."
> +  (declare (side-effect-free t))
> +  (if (consp event) (nth 3 event)))
> +
> +(defsubst event-time (event)
> +  "Return the value of the TIME field of the EVENT, a low level key event."
> +  (declare (side-effect-free t))
> +  (if (consp event) (nth 4 event)))

I think the `cl-defstruct` will define those functions for you (with
a different name, but I think it's OK because these aren't applicable
to other events anyway).

> +;; We store the last events (key/modifier is-press timestamp) here to
> +;; test for multitap.
> +(defvar llk-events nil
> +  "Internal variable for detecting taps.")

"--"

> +;; If positive, return key (xk-shift-l, etc) else return nil.
> +(defun llk-detect-n-tap (n timeout)
> +  "Internal function to detect n-tap keys."

"--"

I think it should not take `n` as an argument and instead it should
automatically discover how many times the key has been tapped and
generate events of the form `double-xk-shift-l`,  `triple-xk-shift-l`,
`tap-xk-shift-l`.

> +           (cl-every 'eq

Please #' to quote function names.  Here and elsewhere.

> +(defun describe-low-level-key ()
> +  "Wait for key press and describe the low level key event it generates."
> +  (interactive)
> +  (setq llk-describe-next-press t))

Can we get rid of `llk-describe-next-press` and instead temporarily

    (define-key special-event-map [low-level-key] 'llk--describe)

or something like that?

> +(defun llk-handle ()
> +  "Internal function to handle low level key events."
> +  (interactive)
> +  (if (and (event-is-key-press last-input-event)
> +           llk-describe-next-press)
> +      (llk-show-event-description)
> +    (let ((tap-key (llk-detect-n-tap
> +                    llk-tap-count
> +                    llk-tap-timeout)))
> +      (when tap-key
> +        (let ((func (cl-third
> +                     (seq-find
> +                      (lambda (b)
> +                        (and (eq (cl-first b) 'tap)
> +                             (eq (cl-second b) tap-key)))
> +                      llk-bindings))))
> +          (cond
> +           ((commandp func) (call-interactively func))

Maybe instead of focusing on running a command, `llk-handle` and
`llk-bind` should concentrate on generating "normal" events that are
then looked up in the normal keymaps.

So the user would use them only to specify which events should be
recognized and which should be ignored.  Then the user can use the
standard keymaps to declare what to do in response to `double-xk-shift-l`.
WDYT?

> +           ((functionp func) (funcall func))))))))

Why?


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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Subject: Re: bug#74423: Low level key events
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On 14/12/2024 12:14, Eli Zaretskii wrote:

> Aren't these events sent only if enable-low-level-key-events is
> non-nil?  If so, this should be documented, and the variable itself
> should be documented.

Fixed this and the style mistakes.


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--------------Ho0Ev8LvMd4RGoiUOUnpb8B7--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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Date: Sat, 14 Dec 2024 13:14:11 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
In-Reply-To: <c0bd3bff-4546-4169-9e5d-ba60ef059b6c@HIDDEN> (message from
 Cecilio Pardo on Fri, 13 Dec 2024 23:55:18 +0100)
Subject: Re: bug#74423: Low level key events
References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
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> Date: Fri, 13 Dec 2024 23:55:18 +0100
> Cc: luangruo@HIDDEN, 74423 <at> debbugs.gnu.org, monnier@HIDDEN
> From: Cecilio Pardo <cpardo@HIDDEN>
> 
> This new version includes a manual entry, and corrected doc strings and 
> comments.

Thanks, a few minor comments.

> +@cindex @code{low-level-key} event
> +@item (low-level-key @var{is-key-press} @var{key} @var{modifier} @var{time} @var{frame})
> +This event is sent on the physical press or release of keys, only on GUI
> +systems, currently X, MS-Windows and PGTK.

Aren't these events sent only if enable-low-level-key-events is
non-nil?  If so, this should be documented, and the variable itself
should be documented.

> +@var{is-key-press} is @code{t} for a key press, @code{nil} for a key release.
> +@var{time} is the event's time in milliseconds, @var{frame} is the
> +frame receiving it. @var{modifier} is @code{nil} if the key is not a
                     ^^
Two spaces between sentences.

> +  DEFVAR_LISP ("enable-low-level-key-events", Venable_low_level_key_events,
> +	       doc: /* If non-nil, reception of low-level key events is enabled.
> +
> +The value configures the set of keys that are handled:
> +
> +If t, send events for all keys.
> +
> +If a number, send events for the corresponding keysym.  When calling
> +'llk-init', a set of variables with the xk- prefix is initialized with
   ^^^^^^^^^^
In doc strings, we quote symbols `like this'.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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Subject: Re: bug#74423: Low level key events
To: Po Lu <luangruo@HIDDEN>
References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
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On 14/12/2024 2:16, Po Lu wrote:
> Cecilio Pardo <cpardo@HIDDEN> writes:
> 
>> +#ifndef HAVE_XINPUT2
>> +static void
>> +xg_maybe_send_low_level_key_event (struct frame *f,
>> +				   GdkEvent *xev)
>> +{
>> +  GdkEventKey xkey = xev->key;

> Why is this !HAVE_XINPUT2?  GTK input method support exists
> independently of XInput 2.

When XInput 2 is active, we get the event through it (XI_KeyPress) 
first. That gives the information we need. The GTK code is used when 
there is no XInput and use_native_input is active.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
Subject: Re: bug#74423: Low level key events
In-Reply-To: <c0bd3bff-4546-4169-9e5d-ba60ef059b6c@HIDDEN> (Cecilio
 Pardo's message of "Fri, 13 Dec 2024 23:55:18 +0100")
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Date: Sat, 14 Dec 2024 09:16:45 +0800
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 Content preview: Cecilio Pardo writes: > +#ifndef HAVE_XINPUT2 > +static void
 > +xg_maybe_send_low_level_key_event (struct frame *f, > + GdkEvent *xev)
 > +{ > + GdkEventKey xkey = xev->key; > + bool is_press; > + Lisp_Object
 key, modifier; [...] 
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 Content preview:  Cecilio Pardo writes: > +#ifndef HAVE_XINPUT2 > +static void
    > +xg_maybe_send_low_level_key_event (struct frame *f, > + GdkEvent *xev)
    > +{ > + GdkEventKey xkey = xev->key; > + bool is_press; > + Lisp_Object
   key, modifier; [...] 
 
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Cecilio Pardo <cpardo@HIDDEN> writes:

> +#ifndef HAVE_XINPUT2
> +static void
> +xg_maybe_send_low_level_key_event (struct frame *f,
> +				   GdkEvent *xev)
> +{
> +  GdkEventKey xkey = xev->key;
> +  bool is_press;
> +  Lisp_Object key, modifier;
> +  union buffered_input_event inev;
> +
> +  if (NILP (Venable_low_level_key_events))
> +    return;
> +
> +  switch (xev->type)
> +    {
> +    case GDK_KEY_PRESS:
> +      is_press = true;
> +      break;
> +    case GDK_KEY_RELEASE:
> +      is_press = false;
> +      break;
> +    default:
> +      return;
> +    }
> +
> +  modifier = x_get_modifier_for_keycode (FRAME_OUTPUT_DATA (f)->display_info,
> +					 xev->key.hardware_keycode);
> +
> +  int keysym = xkey.keyval;
> +
> +  if (keysym >= GDK_KEY_a && keysym <= GDK_KEY_z)
> +    keysym -= GDK_KEY_a - GDK_KEY_A;
> +
> +  if (!kbd_low_level_key_is_enabled (keysym, modifier))
> +    return;
> +
> +  key = make_fixnum (keysym);
> +
> +  EVENT_INIT (inev.ie);
> +  XSETFRAME (inev.ie.frame_or_window, f);
> +  inev.ie.kind = LOW_LEVEL_KEY_EVENT;
> +  inev.ie.timestamp = xkey.time;
> +  inev.ie.arg = list3 (is_press ? Qt : Qnil, key, modifier);
> +  kbd_buffer_store_buffered_event (&inev, &xg_pending_quit_event);
> +}
> +#endif

Why is this !HAVE_XINPUT2?  GTK input method support exists
independently of XInput 2.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Message received at 74423 <at> debbugs.gnu.org:

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Subject: Re: bug#74423: Low level key events
To: Eli Zaretskii <eliz@HIDDEN>
References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
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--------------sxrzhc8vUyFc3eu2Z97hOBFd
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This new version includes a manual entry, and corrected doc strings and 
comments.


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--------------sxrzhc8vUyFc3eu2Z97hOBFd--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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Subject: Re: bug#74423: Low level key events
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On 06/12/2024 2:01, Po Lu:

> I suggest calling XKeysymToString rather than interning the numerical
> value of keysyms received.  This gives users some indication of the
> identity of these keysyms without tediously referring to (at times
> vendor-specific) keysymdef.h files.

Do you mean replacing variable names like xk-backspace, xk-tab with the 
strings returned by XKeysymToString?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#74423: Low level key events
In-Reply-To: <867c8ezny3.fsf@HIDDEN> (Eli Zaretskii's message of "Thu, 05 Dec
 2024 07:41:24 +0200")
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Date: Wed, 4 Dec 2024 22:25:32 +0100
>> Cc: monnier@HIDDEN, luangruo@HIDDEN, 74423 <at> debbugs.gnu.org
>> From: Cecilio Pardo <cpardo@HIDDEN>
>> 
>> On 04/12/2024 21:01, Eli Zaretskii wrote:
>> >> +  DEFVAR_LISP ("enable-low-level-key-events", Venable_low_level_key_events,
>> >> +	       doc: /* If non-nil, reception of low-level key events is enabled.
>> >> +
>> >> +The value configures the set of keys that are handled:
>> >> +
>> >> +If t, send events for all keys.
>> >> +
>> >> +If a number, send events for the corresponding keysym.  When calling
>> >> +'llk-init', a set of variables with the xk- prefix is initialized with
>> >> +the numeric values for keysyms.  This numbers are platform dependent.
>> > 
>> > This seems to say that it is impossible to make the value do the same
>> > on all platforms?  If so, I think it's less useful than it could be,
>> > because Emacs generally tries to abstract platform-specific issues as
>> > much as possible, to facilitate platform-independent Lisp programs
>> > that work the same on all supported systems.
>> > 
>> > Also, there's no information here where to find the list of these xk-
>> > numbers.
>> 
>> Those are variables, like xk-shift-l, xk-a, xk-f1. There is also
>> llk-keysyms, that has a list of all xk-* symbols and their numeric values.
>> 
>> llk-init initializes all of these variables, using numbers that are 
>> platform dependent (XK_* constant KeySyms for X, VK_* "virtual keys" for 
>> windows. GDK keys match X keys.
>> 
>> Numbers are different, but users should use the variables, not the 
>> numbers, for binding and comparing to event values.
>
> This should be explicitly told in the doc string.  Also, if the xk-*
> variables are platform-independent, the rule to map their names to
> keyboard keys should be explained somewhere, perhaps in the manual, so
> that Lisp programmers could easily know how to identify the keys which
> they stand for.
>
>> I can translate the Windows numbers to the X equivalents, so that they 
>> are equal on both platforms.
>
> I'm not sure this is needed, if the xk-* names are the same.
>
>> In any case, I will document this better, with a manual change
>> proposal.
>
> Thanks.  This facility definitely needs to be in the ELisp manual
> before we install it.

I suggest calling XKeysymToString rather than interning the numerical
value of keysyms received.  This gives users some indication of the
identity of these keysyms without tediously referring to (at times
vendor-specific) keysymdef.h files.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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Date: Thu, 05 Dec 2024 07:41:24 +0200
Message-Id: <867c8ezny3.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
In-Reply-To: <162dada7-ad54-4ca5-8f11-d55dd6dccb3c@HIDDEN> (message from
 Cecilio Pardo on Wed, 4 Dec 2024 22:25:32 +0100)
Subject: Re: bug#74423: Low level key events
References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
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> Date: Wed, 4 Dec 2024 22:25:32 +0100
> Cc: monnier@HIDDEN, luangruo@HIDDEN, 74423 <at> debbugs.gnu.org
> From: Cecilio Pardo <cpardo@HIDDEN>
> 
> On 04/12/2024 21:01, Eli Zaretskii wrote:
> >> +  DEFVAR_LISP ("enable-low-level-key-events", Venable_low_level_key_events,
> >> +	       doc: /* If non-nil, reception of low-level key events is enabled.
> >> +
> >> +The value configures the set of keys that are handled:
> >> +
> >> +If t, send events for all keys.
> >> +
> >> +If a number, send events for the corresponding keysym.  When calling
> >> +'llk-init', a set of variables with the xk- prefix is initialized with
> >> +the numeric values for keysyms.  This numbers are platform dependent.
> > 
> > This seems to say that it is impossible to make the value do the same
> > on all platforms?  If so, I think it's less useful than it could be,
> > because Emacs generally tries to abstract platform-specific issues as
> > much as possible, to facilitate platform-independent Lisp programs
> > that work the same on all supported systems.
> > 
> > Also, there's no information here where to find the list of these xk-
> > numbers.
> 
> Those are variables, like xk-shift-l, xk-a, xk-f1. There is also
> llk-keysyms, that has a list of all xk-* symbols and their numeric values.
> 
> llk-init initializes all of these variables, using numbers that are 
> platform dependent (XK_* constant KeySyms for X, VK_* "virtual keys" for 
> windows. GDK keys match X keys.
> 
> Numbers are different, but users should use the variables, not the 
> numbers, for binding and comparing to event values.

This should be explicitly told in the doc string.  Also, if the xk-*
variables are platform-independent, the rule to map their names to
keyboard keys should be explained somewhere, perhaps in the manual, so
that Lisp programmers could easily know how to identify the keys which
they stand for.

> I can translate the Windows numbers to the X equivalents, so that they 
> are equal on both platforms.

I'm not sure this is needed, if the xk-* names are the same.

> In any case, I will document this better, with a manual change
> proposal.

Thanks.  This facility definitely needs to be in the ELisp manual
before we install it.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Message received at 74423 <at> debbugs.gnu.org:

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Subject: Re: bug#74423: Low level key events
To: Eli Zaretskii <eliz@HIDDEN>
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On 04/12/2024 21:01, Eli Zaretskii wrote:
>> +  DEFVAR_LISP ("enable-low-level-key-events", Venable_low_level_key_events,
>> +	       doc: /* If non-nil, reception of low-level key events is enabled.
>> +
>> +The value configures the set of keys that are handled:
>> +
>> +If t, send events for all keys.
>> +
>> +If a number, send events for the corresponding keysym.  When calling
>> +'llk-init', a set of variables with the xk- prefix is initialized with
>> +the numeric values for keysyms.  This numbers are platform dependent.
> 
> This seems to say that it is impossible to make the value do the same
> on all platforms?  If so, I think it's less useful than it could be,
> because Emacs generally tries to abstract platform-specific issues as
> much as possible, to facilitate platform-independent Lisp programs
> that work the same on all supported systems.
> 
> Also, there's no information here where to find the list of these xk-
> numbers.

Those are variables, like xk-shift-l, xk-a, xk-f1. There is also
llk-keysyms, that has a list of all xk-* symbols and their numeric values.

llk-init initializes all of these variables, using numbers that are 
platform dependent (XK_* constant KeySyms for X, VK_* "virtual keys" for 
windows. GDK keys match X keys.

Numbers are different, but users should use the variables, not the 
numbers, for binding and comparing to event values.

I can translate the Windows numbers to the X equivalents, so that they 
are equal on both platforms. In any case, I will document this better, 
with a manual change proposal.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Message received at 74423 <at> debbugs.gnu.org:

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Date: Wed, 04 Dec 2024 22:01:53 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
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Subject: Re: bug#74423: Low level key events
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> Date: Mon, 2 Dec 2024 17:54:03 +0100
> Cc: 74423 <at> debbugs.gnu.org
> From: Cecilio Pardo <cpardo@HIDDEN>
> 
> Here is a new version of the patch. Sorry it took so long. It
> addresses most of the notes I got:

Thanks.  There are several minor issues with this (first line of doc
strings not a single complete sentence, one space between sentences,
etc.), but I guess this is too early for such details.

Other than that, I have only one comment:

> +  DEFVAR_LISP ("enable-low-level-key-events", Venable_low_level_key_events,
> +	       doc: /* If non-nil, reception of low-level key events is enabled.
> +
> +The value configures the set of keys that are handled:
> +
> +If t, send events for all keys.
> +
> +If a number, send events for the corresponding keysym.  When calling
> +'llk-init', a set of variables with the xk- prefix is initialized with
> +the numeric values for keysyms.  This numbers are platform dependent.

This seems to say that it is impossible to make the value do the same
on all platforms?  If so, I think it's less useful than it could be,
because Emacs generally tries to abstract platform-specific issues as
much as possible, to facilitate platform-independent Lisp programs
that work the same on all supported systems.

Also, there's no information here where to find the list of these xk-
numbers.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Message received at 74423 <at> debbugs.gnu.org:

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Subject: Re: bug#74423: Low level key events
To: Stefan Monnier <monnier@HIDDEN>, Eli Zaretskii <eliz@HIDDEN>,
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Here is a new version of the patch. Sorry it took so long. It
addresses most of the notes I got:

Notes by Po Lu:
   - I think now the associated modifier for a key is computed
     properly, with or without XKB for plain X, and for gtk.
   - 'ralt' not generated for ISO_Level3_Shift. This will have to stay
     like this. What we know about the keys if what the system lets us.
   - Don't call x_any_window_to_frame if already called for the event.

Notes by Eli:
   - Change testing for Venable_low_level_key_events. This variable now
     is more complex.

Notes by Stefan:
   - Created and used event-* functions to access event.
   - Only one event with both pieces of information.
   - Selection of keys. Now the variable enable-low-level-key-events
     can be used to select exactly which keys we want to process.
   - About creating lisp object in handle_one_xevent, it is done in
     other events too.

The lisp interface is as follows:
   - A list of variables with keysym values is initialized (xk-*), so the
     user can select keys, not just modifiers.
   - Users can bind globally commands or functions with llk-bind to taps.
   - To use a tapped key as a new modifier, this works:
     (llk-bind 'tap 'xk-shift-r (lambda ()
                (message "H-...")
                (setq unread-command-events
                   (append (event-apply-hyper-modifier nil) nil))))
   - Added the function describe-low-level-key to see what
     keysym/modifier it triggers.


This is implemented for X, pgtkw and MS-Windows.
The pgtj implementation detects that a key is a modifier to filter it, 
but can't decide which one it its.



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bug#74423; Package emacs. Full text available.

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Subject: Re: bug#74423: Low level key events
To: Po Lu <luangruo@HIDDEN>
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On 19/11/2024 0:49, Po Lu wrote:

> You are computing the modifier event to be generated incorrectly.  You
> should search the modifier map (dpyinfo->modmap) for columns containing
> received keysyms, and compare modifier bits derived from the rows where
> they appear against meta_mod_mask, shift_lock_mask, alt_mod_mask,
> super_mod_mask, and hyper_mod_mask in the display structure, or CtrlMask
> and ShiftMask.

Thanks for the guidance. Does this look ok?


Lisp_Object
x_get_modifier_for_keycode (struct x_display_info *dpyinfo,
			    int keycode)
{
#ifdef HAVE_XKB
   if (dpyinfo->xkb_desc)
     for (int mod = 0; mod < XkbNumModifiers; mod++)
       {
	int mask = (1 << mod);
	if (dpyinfo->xkb_desc->map->modmap[keycode] & mask)
	  {
	    if (mask == ShiftMask)
	      return Qshift;
	    if (mask == ControlMask)
	      return Qctrl;
	    if (mask == dpyinfo->meta_mod_mask)
	      return Qmeta;
	    if (mask == dpyinfo->alt_mod_mask)
	      return Qalt;
	    if (mask == dpyinfo->super_mod_mask)
	      return Qsuper;
	    if (mask == dpyinfo->hyper_mod_mask)
	      return Qhyper;
	  }
       }
#endif
   XModifierKeymap *map = dpyinfo->modmap;
   if (map)
     for (int mod = 0; mod < 8; mod++)
       {
	int mask = (1 << mod);
         for (int key = 0; key < map->max_keypermod; key++)
	  if (map->modifiermap[mod * map->max_keypermod + key] == keycode)
	    {
	      if (mask == ShiftMask)
		return Qshift;
	      if (mask == ControlMask)
		return Qctrl;
	      if (mask == dpyinfo->meta_mod_mask)
		return Qmeta;
	      if (mask == dpyinfo->alt_mod_mask)
		return Qalt;
	      if (mask == dpyinfo->super_mod_mask)
		return Qsuper;
	      if (mask == dpyinfo->hyper_mod_mask)
		return Qhyper;
	    }
       }
   return Qnil;
}

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From: Stefan Monnier <monnier@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
Subject: Re: bug#74423: Low level key events
In-Reply-To: <705fabb8-1ea0-4894-8c32-05097ab822c9@HIDDEN> (Cecilio
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>> Move that code to a function, so you can get rid of this `hyper`
>> special case.  BTW, any reason why you couldn't use
>> `event-apply-hyper-modifier`?
> No, no reason. I will change that.

To be clear: I don't know that it works here.

>> I think the list of low-level keys handled here should not be hard-coded.
>> IOW, maybe `enable-low-level-keys` should not be a boolean but
>> a list/map/table indicating which keys to handle.
> I was sending the keys for which I have an immediate use case. Using a list
> looks got, adding some special symbols to choose groups, such as "all
> modifier keys".

I was also thinking that maybe the list/table could be used to avoid
having to define in the C code what is a "modifier key" and things
like that.

>> So, IIUC you might generate 2 low-level events for a single key press?
>> Why?
> We want to allow to detect modifier keys, regardless of the key that is
> used.  For example, when you press Shift_L we generate an event for 'lshift
> and other (of different type) for the modifier 'shift.

But my question is about the fact that you generate two events, not
about the two pieces of information.
IOW you could also generate a single event with both pieces of
information (and if use the "normal" keymaps instead of
`special-event-map` then you might even have a `function-key-map` rule
which converts a `Shift_L` down to a `shift` if there was no binding for
the `Shift_L` event).


        Stefan

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On 19/11/2024 17:43, Stefan Monnier wrote:

>> +         ((functionp func) (funcall func))
>> +         ((eq 'hyper func)
>> +          (message "H-...")
>> +          (let ((r (read-event)))
>> +            (setq unread-command-events
>> +                  (list (event-apply-modifier
>> +                         r 'hyper 24 "H-"))))))))))
> 
> Move that code to a function, so you can get rid of this `hyper`
> special case.  BTW, any reason why you couldn't use
> `event-apply-hyper-modifier`?

No, no reason. I will change that.

> I think the list of low-level keys handled here should not be hard-coded.
> IOW, maybe `enable-low-level-keys` should not be a boolean but
> a list/map/table indicating which keys to handle.

I was sending the keys for which I have an immediate use case. Using a 
list looks got, adding some special symbols to choose groups, such as 
"all modifier keys".

> So, IIUC you might generate 2 low-level events for a single key press?
> Why?

We want to allow to detect modifier keys, regardless of the key that is 
used. For example, when you press Shift_L we generate an event for 
'lshift and other (of different type) for the modifier 'shift.

> Other note: in the distant past (back around Emacs-21) I seem to
> remember Gerd making changes to the event structure so as to avoid
> allocating Lisp objects for this code.  I think it was related to
> problems due to running this low-level event-handler code from within
> a C signal handler, which is a practice was have since stopped, luckily,
> but maybe there are still good reasons to try and avoid involving
> allocating objects into the Lisp heap in this low-level code.

I will look into this.

Thanks for your comments!

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From: Stefan Monnier <monnier@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
Subject: Re: bug#74423: Low level key events
In-Reply-To: <d5c72818-e907-43f5-853a-89ec01264157@HIDDEN> (Cecilio
 Pardo's message of "Mon, 18 Nov 2024 21:35:40 +0100")
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References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
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Date: Tue, 19 Nov 2024 11:43:08 -0500
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> It provides events for press/release of keys, independently of the normal
> keyboard events. These events are bound int the special-event-map. Some l=
isp
> is included to implement detection of multiple tapping on keys, and runni=
ng
> commands or simulating modifiers.

I hadn't followed the discussion over at emacs-devel, but this is cool.
I used to have a local patch which generated extra events for all key
presses/releases.  I never wrote any useful Lisp-level code for it
(all I had were bindings to ignore those events so Emacs was still
usable =F0=9F=99=82), but I really think it would make for fun new hacks.

I haven't had time to look at your whole patch, but here are some comments.

> +  (let ((key (cl-third last-input-event)))

Please try and use `event-*` functions.  If none serve (as will often be
the case), define local "replacements" until they can be promoted to
`subr.el`.

> +         ((functionp func) (funcall func))
> +         ((eq 'hyper func)
> +          (message "H-...")
> +          (let ((r (read-event)))
> +            (setq unread-command-events
> +                  (list (event-apply-modifier
> +                         r 'hyper 24 "H-"))))))))))

Move that code to a function, so you can get rid of this `hyper`
special case.  BTW, any reason why you couldn't use
`event-apply-hyper-modifier`?

[ BTW, this becomes more ... interesting ... when you want to be able to
  cumulative that for several modifiers, in which case your `read-event`
  might return an event which is not the one to which you want to add
  `H-`.  ]

> +  switch (keysym)
> +    {
> +    case GDK_KEY_Shift_L: key =3D Qlshift; break;
> +    case GDK_KEY_Shift_R: key =3D Qrshift; break;
> +    case GDK_KEY_Control_L: key =3D Qlctrl; break;
> +    case GDK_KEY_Control_R: key =3D Qrctrl; break;
> +    case GDK_KEY_Alt_L: key =3D Qlalt; break;
> +    case GDK_KEY_Alt_R: key =3D Qralt; break;
> +    default:
> +      key =3D Qnil;
> +    }
> +
> +   switch (keysym)
> +    {
> +    case GDK_KEY_Shift_L:
> +    case GDK_KEY_Shift_R:
> +      modifier =3D Qshift;
> +      break;
> +    case GDK_KEY_Control_L:
> +    case GDK_KEY_Control_R:
> +      modifier =3D Vx_ctrl_keysym;
> +      if (NILP (modifier))
> +	modifier =3D Qctrl;
> +      break;
> +    case GDK_KEY_Alt_L:
> +    case GDK_KEY_Alt_R:
> +      modifier =3D Vx_meta_keysym;
> +      if (NILP (modifier))
> +	modifier =3D Qalt;
> +      break;
> +    case GDK_KEY_Meta_L:
> +    case GDK_KEY_Meta_R:
> +      modifier =3D Vx_meta_keysym;
> +      if (NILP (modifier))
> +	modifier =3D Qmeta;
> +      break;
> +    case GDK_KEY_Hyper_L:
> +    case GDK_KEY_Hyper_R:
> +      modifier =3D Vx_hyper_keysym;
> +      if (NILP (modifier))
> +	modifier =3D Qhyper;
> +      break;
> +    case GDK_KEY_Super_L:
> +    case GDK_KEY_Super_R:
> +      modifier =3D Vx_super_keysym;
> +      if (NILP (modifier))
> +	modifier =3D Qsuper;
> +      break;
> +    default:
> +      modifier =3D Qnil;
> +    }

I think the list of low-level keys handled here should not be hard-coded.
IOW, maybe `enable-low-level-keys` should not be a boolean but
a list/map/table indicating which keys to handle.

> +  if (!NILP (key))
> +    {
> +      EVENT_INIT (inev.ie);
> +      XSETFRAME (inev.ie.frame_or_window, f);
> +      inev.ie.kind =3D LOW_LEVEL_KEY_EVENT;
> +      inev.ie.timestamp =3D xkey.time;
> +      inev.ie.arg =3D list2 (is_press ? Qt : Qnil, key);
> +      kbd_buffer_store_buffered_event (&inev, &xg_pending_quit_event);
> +    }
> +
> +  if (!NILP (modifier))
> +    {
> +      EVENT_INIT (inev.ie);
> +      XSETFRAME (inev.ie.frame_or_window, f);
> +      inev.ie.kind =3D LOW_LEVEL_MODIFIER_KEY_EVENT;
> +      inev.ie.timestamp =3D xkey.time;
> +      inev.ie.arg =3D list2 (is_press ? Qt : Qnil, modifier);
> +      kbd_buffer_store_buffered_event (&inev, &xg_pending_quit_event);
> +    }
> +}

So, IIUC you might generate 2 low-level events for a single key press?
Why?

Other note: in the distant past (back around Emacs-21) I seem to
remember Gerd making changes to the event structure so as to avoid
allocating Lisp objects for this code.  I think it was related to
problems due to running this low-level event-handler code from within
a C signal handler, which is a practice was have since stopped, luckily,
but maybe there are still good reasons to try and avoid involving
allocating objects into the Lisp heap in this low-level code.


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Message received at 74423 <at> debbugs.gnu.org:

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Date: Tue, 19 Nov 2024 17:29:00 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>,
 Stefan Monnier <monnier@HIDDEN>
In-Reply-To: <d5c72818-e907-43f5-853a-89ec01264157@HIDDEN> (message from
 Cecilio Pardo on Mon, 18 Nov 2024 21:35:40 +0100)
Subject: Re: bug#74423: Low level key events
References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
 <31bdc55d-8c13-4de0-9cef-bd6cc4fb033f@HIDDEN>
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> Date: Mon, 18 Nov 2024 21:35:40 +0100
> From: Cecilio Pardo <cpardo@HIDDEN>
> 
> Here is a still incomplete patch for this, renamed from "physical 
> keyboard events", following up to
> https://lists.gnu.org/archive/html/emacs-devel/2024-11/msg00085.html
> 
> It provides events for press/release of keys, independently of the 
> normal keyboard events. These events are bound int the 
> special-event-map. Some lisp is included to implement detection of 
> multiple tapping on keys, and running commands or simulating modifiers.

Thanks, I have some minor comments, and also added Stefan to the
discussion, in case he will also have comments.

> +  if (!Venable_low_level_key_events)

You treat this variable as a C boolean, i.e. assume it was defined
with DEFVAR_BOOL, but in that case our convention is to call the C
variables without the leading 'V'.  OTOH, if you envision that this
variable could be something other than nil or t in Lisp, then you need
to use NILP here.

> +  DEFVAR_LISP ("enable-low-level-key-events", Venable_low_level_key_events,
> +	       doc: /* Enabled the recepcion of low level key events.
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"If non-nil, reception of low-level key events is enabled."

> +static void
> +pgtk_maybe_send_low_level_key_event (GdkEvent *event)
> +{
> +  if (!Venable_low_level_key_events)
> +    return;

Same problem with the test here.

> --- a/src/w32fns.c
> +++ b/src/w32fns.c
> @@ -4669,6 +4669,11 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
>      case WM_KEYUP:
>      case WM_SYSKEYUP:
>        record_keyup (wParam, lParam);
> +      if (Venable_low_level_key_events)
> +	{
> +	  signal_user_input ();
> +	  my_post_msg( &wmsg, hwnd, WM_EMACS_LOW_LEVEL_KEY, wParam, lParam );
> +	}

And here (and in several other places in the patch).

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Message received at 74423 <at> debbugs.gnu.org:

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From: Po Lu <luangruo@HIDDEN>
To: Cecilio Pardo <cpardo@HIDDEN>
Subject: Re: bug#74423: Low level key events
In-Reply-To: <d5c72818-e907-43f5-853a-89ec01264157@HIDDEN> (Cecilio
 Pardo's message of "Mon, 18 Nov 2024 21:35:40 +0100")
References: <fb50ec11-7aec-481e-8a3a-ecdcf22eb7c0@HIDDEN>
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Date: Tue, 19 Nov 2024 07:49:00 +0800
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Cecilio Pardo <cpardo@HIDDEN> writes:

> +   switch (keysym)
> +    {
> +    case GDK_KEY_Shift_L:
> +    case GDK_KEY_Shift_R:
> +      modifier = Qshift;
> +      break;
> +    case GDK_KEY_Control_L:
> +    case GDK_KEY_Control_R:
> +      modifier = Vx_ctrl_keysym;
> +      if (NILP (modifier))
> +	modifier = Qctrl;
> +      break;
> +    case GDK_KEY_Alt_L:
> +    case GDK_KEY_Alt_R:
> +      modifier = Vx_meta_keysym;
> +      if (NILP (modifier))
> +	modifier = Qalt;
> +      break;
> +    case GDK_KEY_Meta_L:
> +    case GDK_KEY_Meta_R:
> +      modifier = Vx_meta_keysym;
> +      if (NILP (modifier))
> +	modifier = Qmeta;
> +      break;
> +    case GDK_KEY_Hyper_L:
> +    case GDK_KEY_Hyper_R:
> +      modifier = Vx_hyper_keysym;
> +      if (NILP (modifier))
> +	modifier = Qhyper;
> +      break;
> +    case GDK_KEY_Super_L:
> +    case GDK_KEY_Super_R:
> +      modifier = Vx_super_keysym;
> +      if (NILP (modifier))
> +	modifier = Qsuper;
> +      break;
> +    default:
> +      modifier = Qnil;
> +    }

This is not the proper means of establishing the modifier bound to a key
symbol in GTK, but I cannot immediately tell you what the alternative is.

> +	  my_post_msg( &wmsg, hwnd, WM_EMACS_LOW_LEVEL_KEY, wParam, lParam );
> +	}

> +	  my_post_msg( &wmsg, hwnd, WM_EMACS_LOW_LEVEL_KEY, wParam, lParam );
> +	}

Stylistic issues.

> +static void
> +x_maybe_send_low_level_key_event (struct x_display_info *dpyinfo,
> +				  const XEvent *xev)
> +{
> +  XKeyEvent xkey;
> +  bool is_press;
> +  KeySym keysym;
> +  Lisp_Object key, modifier;
> +  struct input_event ie;
> +
> +  if (!Venable_low_level_key_events)
> +    return;
> +
> +  switch (xev->type)
> +    {
> +    case KeyPress:
> +      is_press = true;
> +      xkey = xev->xkey;
> +      break;
> +    case KeyRelease:
> +      is_press = false;
> +      xkey = xev->xkey;
> +      break;
> +#ifdef HAVE_XINPUT2
> +    case GenericEvent:
> +      XIDeviceEvent *xiev = xev->xcookie.data;
> +      switch (xev->xgeneric.evtype)
> +	{
> +	case XI_KeyPress:
> +	  is_press = true;
> +	  break;
> +	case XI_KeyRelease:
> +	  is_press = false;
> +	  break;
> +	default:
> +	  return;
> +	}
> +
> +      xkey.serial = xiev->serial;
> +      xkey.send_event = xiev->send_event;
> +      xkey.display = xiev->display;
> +      xkey.window = xiev->event;
> +      xkey.root = xiev->root;
> +      xkey.subwindow = xiev->child;
> +      xkey.time = xiev->time;
> +      xkey.x = xiev->event_x;
> +      xkey.y = xiev->event_y;
> +      xkey.x_root = xiev->root_x;
> +      xkey.y_root = xiev->root_y;
> +      xkey.state = xiev->mods.effective;
> +      xkey.keycode = xiev->detail;
> +      xkey.same_screen = 1;
> +      break;
> +#endif
> +    default:
> +      return;
> +    }
> +
> +  struct frame *f = x_any_window_to_frame (dpyinfo, xkey.window);
> +  if (!f)
> +    return;
> +
> +  XLookupString (&xkey, NULL, 0, &keysym, NULL);
> +
> +  switch (keysym)
> +    {
> +    case XK_Shift_L: key = Qlshift; break;
> +    case XK_Shift_R: key = Qrshift; break;
> +    case XK_Control_L: key = Qlctrl; break;
> +    case XK_Control_R: key = Qrctrl; break;
> +    case XK_Alt_L: key = Qlalt; break;
> +    case XK_Alt_R: key = Qralt; break;
> +    default:
> +      key = Qnil;
> +    }

This doesn't generate `ralt' events on my system, as that key produces
the keysym ISO_Level3_Shift/

> +   switch (keysym)
> +    {
> +    case XK_Shift_L:
> +    case XK_Shift_R:
> +      modifier = Qshift;
> +      break;
> +    case XK_Control_L:
> +    case XK_Control_R:
> +      modifier = Vx_ctrl_keysym;
> +      if (NILP (modifier))
> +	modifier = Qctrl;
> +      break;
> +    case XK_Alt_L:
> +    case XK_Alt_R:
> +      modifier = Vx_meta_keysym;
> +      if (NILP (modifier))
> +	modifier = Qalt;
> +      break;
> +    case XK_Meta_L:
> +    case XK_Meta_R:
> +      modifier = Vx_meta_keysym;
> +      if (NILP (modifier))
> +	modifier = Qmeta;
> +      break;
> +    case XK_Hyper_L:
> +    case XK_Hyper_R:
> +      modifier = Vx_hyper_keysym;
> +      if (NILP (modifier))
> +	modifier = Qhyper;
> +      break;
> +    case XK_Super_L:
> +    case XK_Super_R:
> +      modifier = Vx_super_keysym;
> +      if (NILP (modifier))
> +	modifier = Qsuper;
> +      break;
> +    default:
> +      modifier = Qnil;
> +    }

You are computing the modifier event to be generated incorrectly.  You
should search the modifier map (dpyinfo->modmap) for columns containing
received keysyms, and compare modifier bits derived from the rows where
they appear against meta_mod_mask, shift_lock_mask, alt_mod_mask,
super_mod_mask, and hyper_mod_mask in the display structure, or CtrlMask
and ShiftMask.

>      case KeyPress:
> +      x_maybe_send_low_level_key_event (dpyinfo, event);
>        x_display_set_last_user_time (dpyinfo, event->xkey.time,
>  				    event->xkey.send_event,
>  				    true);
> @@ -20715,6 +20853,7 @@ handle_one_xevent (struct x_display_info *dpyinfo,
>  #endif
>  
>      case KeyRelease:
> +      x_maybe_send_low_level_key_event (dpyinfo, event);
>  #ifdef HAVE_X_I18N
>        /* Don't dispatch this event since XtDispatchEvent calls
>           XFilterEvent, and two calls in a row may freeze the
> @@ -23970,6 +24109,8 @@ handle_one_xevent (struct x_display_info *dpyinfo,
>  	      struct xi_device_t *device, *source;
>  	      XKeyPressedEvent xkey;
>  
> +	      x_maybe_send_low_level_key_event (dpyinfo, event);
> +
>  	      coding = Qlatin_1;
>  
>  	      /* The code under this label is quite desultory.  There
> @@ -24586,6 +24727,8 @@ handle_one_xevent (struct x_display_info *dpyinfo,
>  #endif
>  
>  	  case XI_KeyRelease:
> +	    x_maybe_send_low_level_key_event (dpyinfo, event);

Would you rearrange the locations of calls to x_any_window_to_frame in
handle_one_xevent so that you need not redundantly call the same
function in x_maybe_send_low_level_key_event?

Thanks for your interest in Emacs.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:

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Here is a still incomplete patch for this, renamed from "physical 
keyboard events", following up to
https://lists.gnu.org/archive/html/emacs-devel/2024-11/msg00085.html

It provides events for press/release of keys, independently of the 
normal keyboard events. These events are bound int the 
special-event-map. Some lisp is included to implement detection of 
multiple tapping on keys, and running commands or simulating modifiers.

Currently, only modifier keys are available, because other keys would 
send their own normal event. This could change when an use case for 
other keys appears.

To provide events for 'logical' modifiers Ctrl, Meta, etc., now there is 
a new event low-level-modifier, in addition to low-level-key. If you 
press Shift_L, two events will be generated, one for 'shift as 
low-level-modifier, and one for 'lshift as low-level-key. The lisp part 
handles those events separately.

I added a variable that enables/disables everything, 
enable-low-level-key-events.

This are some of Po Lu's notes on the previous patch:

> [...] Emacs must not depend on XKB for such a basic feature.

Fixed.

> Please find some means of generating such events by saving them into the
> keyboard event buffer defined in handle_ome_xevent.

As we may generate two events, that is not possible.

> x_filter_events is not the proper location for this call.  It is only
> invoked to filter an event through the active GTK or X input method
> context, and it is not invoked if Emacs is configured not to open input
> method contexts, or they are unavailable by happenstance.

Done. If XINPUT is enabled, the XI_KeyPress event used, over the gtk 
one. If not, the gtk event is used unless there is no input method. In 
this case KeyPress event is used.

The pgtk version is not updated.





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--------------NfVipp8PWcB7slQ6v5g6HUD0--

Acknowledgement sent to Cecilio Pardo <cpardo@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.

Report forwarded to bug-gnu-emacs@HIDDEN:
bug#74423; Package emacs. Full text available.

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Last modified: Sun, 12 Jan 2025 05:45:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.