How to implement mouse highlighing in tabulated list mode, just like for buttons?

How to implement mouse highlighing in tabulated list mode, just like for buttons?

[Jean Louis]

On the video below, one can see highlighting of Emacs buttons on the
right side. That is neat and better, as it gives to user sense what
one can click with the mouse.

https://gnu.support/images/2023/02/2023-02-04/2023-02-04-17:31:58.ogv

On the left side, one can see mouse hovering over the list of items in
tabulated-list-mode whereby in echo area there are messages with the
text of items where user hovers the mouse pointer.

In the same time, one can see hl-line-mode turned on.

I would like to improve that what is on the left side.

I would prefer if I can hover hl-line-mode highlighted line up and
down by only moving the mouse in tabulated list mode. 

Is that possible somehow?

Or if highlighted line from hl-line-mode is not movable, then maybe it
could be possible to highlight lines in tabulated list mode, in the
same way how lines are highlighted when mouse hovers over Emacs buttons.

--
Jean

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Re: How to implement mouse highlighing in tabulated list mode, just like for buttons?

[Eli Zaretskii]

> Date: Sat, 04 Feb 2023 17:52:41 +0100
> From: Jean Louis <bugs@gnu.support>
> 
> I would prefer if I can hover hl-line-mode highlighted line up and
> down by only moving the mouse in tabulated list mode. 
> 
> Is that possible somehow?
> 
> Or if highlighted line from hl-line-mode is not movable, then maybe it
> could be possible to highlight lines in tabulated list mode, in the
> same way how lines are highlighted when mouse hovers over Emacs buttons.

Put the mouse-face property on each line, and you have it.

  (add-text-properties (line-beginning-position) (line-end-position)
                       '(mouse-face highlight))

Re: How to implement mouse highlighing in tabulated list mode, just like for buttons?

[Jean Louis]

* Eli Zaretskii <eliz@gnu.org> [2023-02-04 20:06]:
> > Date: Sat, 04 Feb 2023 17:52:41 +0100
> > From: Jean Louis <bugs@gnu.support>
> > 
> > I would prefer if I can hover hl-line-mode highlighted line up and
> > down by only moving the mouse in tabulated list mode. 
> > 
> > Is that possible somehow?
> > 
> > Or if highlighted line from hl-line-mode is not movable, then maybe it
> > could be possible to highlight lines in tabulated list mode, in the
> > same way how lines are highlighted when mouse hovers over Emacs buttons.
> 
> Put the mouse-face property on each line, and you have it.
> 
   (add-text-properties (line-beginning-position) (line-end-position)
                        '(mouse-face highlight))

Thank you.

Is there any way to make something like this automatically? Maybe by
defining mouse face to have that property?

I wonder if it would slow down the listings in tabulated-list-mode.


--
Jean

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Re: How to implement mouse highlighing in tabulated list mode, just like for buttons?

[Eli Zaretskii]

> Date: Sat, 4 Feb 2023 21:47:07 +0300
> From: Jean Louis <bugs@gnu.support>
> Cc: emacs-devel@gnu.org
> 
>    (add-text-properties (line-beginning-position) (line-end-position)
>                         '(mouse-face highlight))
> 
> Thank you.
> 
> Is there any way to make something like this automatically? Maybe by
> defining mouse face to have that property?

What do you mean by "that property"?

mouse-face is a text property, and 'highlight' is on of its possible
values.  I don't think we have a feature whereby an arbitrary text
property can be put on every line of buffer text.

> I wonder if it would slow down the listings in tabulated-list-mode.

When the mouse-face has the value 'highlight', it is only shown when
the mouse pointer is above the text with that property.  Otherwise,
the text is displayed normally.

Re: How to implement mouse highlighing in tabulated list mode, just like for buttons?

[Jean Louis]

* Eli Zaretskii <eliz@gnu.org> [2023-02-04 22:01]:
> What do you mean by "that property"?
> 
> mouse-face is a text property, and 'highlight' is on of its possible
> values.  I don't think we have a feature whereby an arbitrary text
> property can be put on every line of buffer text.

Thanks, I was researching, and I got it!

I understand `mouse-face' is a text property, and I can give it
`highlight'.

First I was thinking that I could make face with text property, but
that I am not sure. 

Can I could just add face with 'mouse-face as text property?

I did not finish the research. I just understood that I can add text
property, but if I can add text property to face, if those 2 are at
all connected, I do not know yet.

I am achieving now the effect by using `propertize` on the element of
each entry of `tabulated-list-entries':

(let ((name (propertize (aref item 1) 'mouse-face 'highlight)))

So that works now well!

> > I wonder if it would slow down the listings in tabulated-list-mode.
> 
> When the mouse-face has the value 'highlight', it is only shown when
> the mouse pointer is above the text with that property.  Otherwise,
> the text is displayed normally.

Yes.

I am thinking that if I wish to place mouse-face as text property
line by line, I better avoid making it after the tabulated-list-mode,
as that would slow down. 

But now I do not see difference that I can feel.


--
Jean

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Re: How to implement mouse highlighing in tabulated list mode, just like for buttons?

[Eli Zaretskii]

> Date: Sun, 5 Feb 2023 12:06:16 +0300
> From: Jean Louis <bugs@gnu.support>
> Cc: emacs-devel@gnu.org
> 
> Can I could just add face with 'mouse-face as text property?

'face' and 'mouse-face' are two different text properties, so a face
cannot "have" another text property.

Also, only 'mouse-face' text property is handled in the way that makes
the text highlighted when the mouse pointer is above it.

> I am achieving now the effect by using `propertize` on the element of
> each entry of `tabulated-list-entries':
> 
> (let ((name (propertize (aref item 1) 'mouse-face 'highlight)))
> 
> So that works now well!
> 
> > > I wonder if it would slow down the listings in tabulated-list-mode.
> > 
> > When the mouse-face has the value 'highlight', it is only shown when
> > the mouse pointer is above the text with that property.  Otherwise,
> > the text is displayed normally.
> 
> Yes.
> 
> I am thinking that if I wish to place mouse-face as text property
> line by line, I better avoid making it after the tabulated-list-mode,
> as that would slow down. 

I doubt this will slow down.

[SOLVED] Re: How to implement mouse highlighing in tabulated list mode, just like for buttons?

[Jean Louis]

* Eli Zaretskii <eliz@gnu.org> [2023-02-05 13:21]:
> > Date: Sun, 5 Feb 2023 12:06:16 +0300
> > From: Jean Louis <bugs@gnu.support>
> > Cc: emacs-devel@gnu.org
> > 
> > Can I could just add face with 'mouse-face as text property?
> 
> 'face' and 'mouse-face' are two different text properties, so a face
> cannot "have" another text property.

Oh yes! Of course.

Solved and it works well, thank you.

--
Jean

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