Hope tabulated-list header can be moved via horizontal-scroll-bar

Hope tabulated-list header can be moved via horizontal-scroll-bar

[Siyuan Chen]

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Hi,

Emacs tabulated-list is very similar to dataGridView control in WinForm,
but the list header can not be moved via horizontal-scroll-bar, which
prevents some tabulated-lists (that have many columns) from being placed on
the side bar.

Hope tabulated-list header can be moved via horizontal-scroll-bar in the
future or anyone know about alternatives?

Thanks.

Best regards,
Siyuan Chen

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Re: Hope tabulated-list header can be moved via horizontal-scroll-bar

[Eli Zaretskii]

> From: Siyuan Chen <chansey97@gmail.com>
> Date: Thu, 20 Jun 2024 05:12:35 +0800
> 
> Emacs tabulated-list is very similar to dataGridView control in WinForm, but the list header can not be moved
> via horizontal-scroll-bar, which prevents some tabulated-lists (that have many columns) from being placed on
> the side bar.
> 
> Hope tabulated-list header can be moved via horizontal-scroll-bar in the future or anyone know about
> alternatives?

This needs to be implemented in the display code.  Currently, mode
line and header line are not scrolled horizontally with the text
(header line is the basis for implementation of tabulated-lists).
Conceptually, scrolling in Emacs moves the viewport, not the text, and
header line is considered to be part of the viewport.

If we do implement that, it should probably be a special minor mode,
since not every header line should scroll with the text.  Patches
welcome.

Re: Hope tabulated-list header can be moved via horizontal-scroll-bar

[Juri Linkov]

>> Emacs tabulated-list is very similar to dataGridView control in WinForm, but the list header can not be moved
>> via horizontal-scroll-bar, which prevents some tabulated-lists (that have many columns) from being placed on
>> the side bar.
>>
>> Hope tabulated-list header can be moved via horizontal-scroll-bar in the future or anyone know about
>> alternatives?
>
> This needs to be implemented in the display code.  Currently, mode
> line and header line are not scrolled horizontally with the text
> (header line is the basis for implementation of tabulated-lists).
> Conceptually, scrolling in Emacs moves the viewport, not the text, and
> header line is considered to be part of the viewport.
>
> If we do implement that, it should probably be a special minor mode,
> since not every header line should scroll with the text.  Patches
> welcome.

'proced' can scroll the header line.

Re: Hope tabulated-list header can be moved via horizontal-scroll-bar

[Juri Linkov]

>>> Emacs tabulated-list is very similar to dataGridView control in WinForm, but the list header can not be moved
>>> via horizontal-scroll-bar, which prevents some tabulated-lists (that have many columns) from being placed on
>>> the side bar.
>>>
>>> Hope tabulated-list header can be moved via horizontal-scroll-bar in the future or anyone know about
>>> alternatives?
>>
>> This needs to be implemented in the display code.  Currently, mode
>> line and header line are not scrolled horizontally with the text
>> (header line is the basis for implementation of tabulated-lists).
>> Conceptually, scrolling in Emacs moves the viewport, not the text, and
>> header line is considered to be part of the viewport.
>>
>> If we do implement that, it should probably be a special minor mode,
>> since not every header line should scroll with the text.  Patches
>> welcome.
>
> 'proced' can scroll the header line.

Actually 'proced' relies on the hack in 'proced-header-line'
that subtracts the amount of 'window-hscroll' columns.
Apparently this line

  (add-hook 'post-command-hook #'force-mode-line-update nil t)  ;; FIXME: Why?

was intended to update the header-line after horizontal scrolling,
but it works correctly even without this hook.

BTW, there is an obsolete function 'tabulated-list-window-scroll-function',
but probably it's unrelated.