From: Stephen Berman <stephen.berman@gmx.net>
To: Heime <heimeborgia@protonmail.com>
Cc: Heime via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org>
Subject: Re: Buttons in help buffer that displays contents of variables
Date: Sun, 23 Jul 2023 00:50:12 +0200 [thread overview]
Message-ID: <87zg3ntvbv.fsf@gmx.net> (raw)
In-Reply-To: <2o0OzY_iBd8TOmOEzF9du3kSZGrEKIJbl7QdqK3lyQ7xonVsF2v5W3Dxt4hQ8T1cQfShQxikqyAhCD4Kc0BGJNGaPya9ClnAWarEa9ZJ9HQ=@protonmail.com> (Heime's message of "Sat, 22 Jul 2023 22:42:55 +0000")
On Sat, 22 Jul 2023 22:42:55 +0000 Heime <heimeborgia@protonmail.com> wrote:
> ------- Original Message -------
> On Sunday, July 23rd, 2023 at 10:28 AM, Stephen Berman
> <stephen.berman@gmx.net> wrote:
>
>
>> On Sat, 22 Jul 2023 22:13:25 +0000 Heime heimeborgia@protonmail.com wrote:
>>
>>
>> [...]
>>
>> > > > > > > > The error says the function my-action expects one argument, but you
>> > > > > > > > defined it with an empty argument list. If you don't want to use the
>> > > > > > > > argument, you can use `' as a placeholder for the required argument,
>> > > > > > > > which will be ignored by the byte compiler:
>> > > > > > > >
>> > > > > > > > (defun my-action ()
>> > > > > > > > "Function to be executed when the button is clicked."
>> > > > > > > > (interactive)
>> > > > > > > > (message "%s" myvar))
>> > > > > > > >
>> > > > > > > > Steve Berman
>> >
>> > Do you know what the single argument is used for ?
>>
>>
>> This is explained in the Info node `(elisp) Manipulating Buttons': Where a
>> BUTTON parameter is specified, it means an object referring to a specific
>> button, either an overlay (for overlay buttons), or a buffer-position or
>> marker (for text property buttons). Such an object is passed as the first
>> argument to a button’s invocation function when it is invoked. See also the
>> function` button-activate' described in that node.
>>
>> Steve Berman
>
> What would be the actual object name passed to the function ?
I'm not sure what you mean by "actual object name", but since the
parameter is a local variable of the function, you can use any name for
it you like, including, as noted above, the underscore `_' (which seems
to have been removed by your mail program in the above citation), if you
don't use it in the body of the function.
Steve Berman
next prev parent reply other threads:[~2023-07-22 22:50 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-22 14:40 Buttons in help buffer that displays contents of variables Heime
2023-07-22 19:18 ` Heime
2023-07-22 20:14 ` Stephen Berman
2023-07-22 20:24 ` Heime
2023-07-22 20:48 ` Stephen Berman
2023-07-22 21:24 ` Heime
2023-07-22 21:46 ` Stephen Berman
2023-07-22 22:02 ` Heime
2023-07-22 22:13 ` Heime
2023-07-22 22:28 ` Stephen Berman
2023-07-22 22:42 ` Heime
2023-07-22 22:50 ` Stephen Berman [this message]
2023-07-22 23:13 ` Heime
2023-07-23 7:45 ` Yuri Khan
2023-07-23 19:34 ` Heime
2023-07-23 19:57 ` Yuri Khan
2023-07-23 20:05 ` Heime
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