Smooth scrolling

Smooth scrolling

[Marcelo de Moraes Serpa]

Hi,

I know many of might say it's "not needed", but I find that, to get an
overview of the file and when you are still getting acquanted to it,
scrolling slowly (without jumps) is useful. Textmate does it the way I
like. Emacs' scrolling is too "jumpy".

Is there a way to setup emacs for a almost-flawless smooth scrolling mode?

Thanks,

Marcelo.

Re: Smooth scrolling

[Juanma Barranquero]

> Is there a way to setup emacs for a almost-flawless smooth scrolling mode?

You can try

(setq redisplay-dont-pause t
      scroll-conservatively most-positive-fixnum
      scroll-step 0)

and perhaps, depending on your tastes

(setq scroll-preserve-screen-position 'always)

    Juanma

Re: Smooth scrolling

[Marcelo de Moraes Serpa]

Thanks for the reply, Juanma,

> (setq redisplay-dont-pause t
>      scroll-conservatively most-positive-fixnum
>      scroll-step 0)
>
> and perhaps, depending on your tastes
>
> (setq scroll-preserve-screen-position 'always)
>

I evaluated them on scratch but didn't see any difference. How am I
supposed to use the code?

Cheers,

Marcelo.


On Tue, Jul 6, 2010 at 11:37 AM, Juanma Barranquero <lekktu@gmail.com> wrote:
>> Is there a way to setup emacs for a almost-flawless smooth scrolling mode?
>
> You can try
>
> (setq redisplay-dont-pause t
>      scroll-conservatively most-positive-fixnum
>      scroll-step 0)
>
> and perhaps, depending on your tastes
>
> (setq scroll-preserve-screen-position 'always)
>
>    Juanma
>

Re: Smooth scrolling

[Marcelo de Moraes Serpa]

PS: I'd like it to work with the mouse wheel too.

Thanks,

Marcelo.

On Tue, Jul 6, 2010 at 11:42 AM, Marcelo de Moraes Serpa
<celoserpa@gmail.com> wrote:
> Thanks for the reply, Juanma,
>
>> (setq redisplay-dont-pause t
>>      scroll-conservatively most-positive-fixnum
>>      scroll-step 0)
>>
>> and perhaps, depending on your tastes
>>
>> (setq scroll-preserve-screen-position 'always)
>>
>
> I evaluated them on scratch but didn't see any difference. How am I
> supposed to use the code?
>
> Cheers,
>
> Marcelo.
>
>
> On Tue, Jul 6, 2010 at 11:37 AM, Juanma Barranquero <lekktu@gmail.com> wrote:
>>> Is there a way to setup emacs for a almost-flawless smooth scrolling mode?
>>
>> You can try
>>
>> (setq redisplay-dont-pause t
>>      scroll-conservatively most-positive-fixnum
>>      scroll-step 0)
>>
>> and perhaps, depending on your tastes
>>
>> (setq scroll-preserve-screen-position 'always)
>>
>>    Juanma
>>
>

Re: Smooth scrolling

[Deniz Dogan]

2010/7/6 Marcelo de Moraes Serpa <celoserpa@gmail.com>:
> Thanks for the reply, Juanma,
>
>> (setq redisplay-dont-pause t
>>      scroll-conservatively most-positive-fixnum
>>      scroll-step 0)
>>
>> and perhaps, depending on your tastes
>>
>> (setq scroll-preserve-screen-position 'always)
>>
>
> I evaluated them on scratch but didn't see any difference. How am I
> supposed to use the code?
>

The code that Juanma gave you makes Emacs scroll "line by line" when
moving the cursor. Are you by any chance using the scroll wheel to
scroll?

-- 
Deniz Dogan

Re: Smooth scrolling

[Marcelo de Moraes Serpa]

Yeah, I do use the wheel to scroll from time to time, it's pretty
useful to scan a long file, for example.

Marcelo.

On Tue, Jul 6, 2010 at 11:45 AM, Deniz Dogan <deniz.a.m.dogan@gmail.com> wrote:
> 2010/7/6 Marcelo de Moraes Serpa <celoserpa@gmail.com>:
>> Thanks for the reply, Juanma,
>>
>>> (setq redisplay-dont-pause t
>>>      scroll-conservatively most-positive-fixnum
>>>      scroll-step 0)
>>>
>>> and perhaps, depending on your tastes
>>>
>>> (setq scroll-preserve-screen-position 'always)
>>>
>>
>> I evaluated them on scratch but didn't see any difference. How am I
>> supposed to use the code?
>>
>
> The code that Juanma gave you makes Emacs scroll "line by line" when
> moving the cursor. Are you by any chance using the scroll wheel to
> scroll?
>
> --
> Deniz Dogan
>

Re: Smooth scrolling

[Juanma Barranquero]

On Tue, Jul 6, 2010 at 18:42, Marcelo de Moraes Serpa
<celoserpa@gmail.com> wrote:

> I evaluated them on scratch but didn't see any difference. How am I
> supposed to use the code?

Evaluating it, or adding it to .emacs, should suffice.

You didn't give much information. Emacs version, platform? What do you
mean exactly by smooth scrolling? I assumed you wanted line-by-line
scrolling with the cursor.

    Juanma

Re: Smooth scrolling

[Marcelo de Moraes Serpa]

Emacs on OSX Snow Leopard, v. 23.2. I'd like wheel-scrolling that
works like Textmate's scrolling. It's not really line by line, I think
it is pixel-based. Either way, with Textmate, you can scroll a huge
file with the mouse without it jumping large portions, and it also
doesn't have rendering glitches. Emacs does. The keyboard scrolling
for me is fine -- I mainly use C-r/s when using the keyboard, anyway.

Thanks!

Marcelo.

On Tue, Jul 6, 2010 at 12:16 PM, Juanma Barranquero <lekktu@gmail.com> wrote:
> On Tue, Jul 6, 2010 at 18:42, Marcelo de Moraes Serpa
> <celoserpa@gmail.com> wrote:
>
>> I evaluated them on scratch but didn't see any difference. How am I
>> supposed to use the code?
>
> Evaluating it, or adding it to .emacs, should suffice.
>
> You didn't give much information. Emacs version, platform? What do you
> mean exactly by smooth scrolling? I assumed you wanted line-by-line
> scrolling with the cursor.
>
>    Juanma
>

Re: Smooth scrolling

[Deniz Dogan]

2010/7/6 Marcelo de Moraes Serpa <celoserpa@gmail.com>:
> Emacs on OSX Snow Leopard, v. 23.2. I'd like wheel-scrolling that
> works like Textmate's scrolling. It's not really line by line, I think
> it is pixel-based. Either way, with Textmate, you can scroll a huge
> file with the mouse without it jumping large portions, and it also
> doesn't have rendering glitches. Emacs does. The keyboard scrolling
> for me is fine -- I mainly use C-r/s when using the keyboard, anyway.
>

I understand exactly what you mean by pixel-based scrolling. This is
how many other editors work, e.g. Notepad or Textmate. I'd love to
have that as well, but I don't think there is anything like that in
Emacs today. Many parts of Emacs are about columns and lines, e.g. the
size of frames are "measured" in columns and lines.

-- 
Deniz Dogan

Re: Smooth scrolling

[Jesse W. Wilson]

Pixel-based scrolling would be nice for my applications too. I use 
org-mode and iimage-mode to keep a laboratory notebook, and scrolling 
with this combination is awful. If I want to scan through my notes I 
have to export to html and open in a web browser to get the right feel.

Also, on my tablet PC (Windows 7), every application I have works great 
with single-finger panning (similar to the way iPod/iPad scrolls) except 
for emacs.

-- 
------------------------------------------------------------------
Jesse Wilson
Bartels Lab: Ultrafast and Nonlinear Optics
Electrical and Computer Engineering Department
Colorado State University
jessew@engr.colostate.edu


On 7/6/2010 3:21 PM, Deniz Dogan wrote:
> 2010/7/6 Marcelo de Moraes Serpa<celoserpa@gmail.com>:
>    
>> Emacs on OSX Snow Leopard, v. 23.2. I'd like wheel-scrolling that
>> works like Textmate's scrolling. It's not really line by line, I think
>> it is pixel-based. Either way, with Textmate, you can scroll a huge
>> file with the mouse without it jumping large portions, and it also
>> doesn't have rendering glitches. Emacs does. The keyboard scrolling
>> for me is fine -- I mainly use C-r/s when using the keyboard, anyway.
>>
>>      
> I understand exactly what you mean by pixel-based scrolling. This is
> how many other editors work, e.g. Notepad or Textmate. I'd love to
> have that as well, but I don't think there is anything like that in
> Emacs today. Many parts of Emacs are about columns and lines, e.g. the
> size of frames are "measured" in columns and lines.
>
>    

Re: Smooth scrolling

[Marcelo de Moraes Serpa]

Let's join efforts and ask for it then :)

Is there a place we could submit/vote for feature suggestions for next
emacs versions?

Cheers,

Marcelo.

On Tue, Jul 6, 2010 at 8:47 PM, Jesse W. Wilson <syrex314@gmail.com> wrote:
> Pixel-based scrolling would be nice for my applications too. I use org-mode
> and iimage-mode to keep a laboratory notebook, and scrolling with this
> combination is awful. If I want to scan through my notes I have to export to
> html and open in a web browser to get the right feel.
>
> Also, on my tablet PC (Windows 7), every application I have works great with
> single-finger panning (similar to the way iPod/iPad scrolls) except for
> emacs.
>
> --
> ------------------------------------------------------------------
> Jesse Wilson
> Bartels Lab: Ultrafast and Nonlinear Optics
> Electrical and Computer Engineering Department
> Colorado State University
> jessew@engr.colostate.edu
>
>
> On 7/6/2010 3:21 PM, Deniz Dogan wrote:
>>
>> 2010/7/6 Marcelo de Moraes Serpa<celoserpa@gmail.com>:
>>
>>>
>>> Emacs on OSX Snow Leopard, v. 23.2. I'd like wheel-scrolling that
>>> works like Textmate's scrolling. It's not really line by line, I think
>>> it is pixel-based. Either way, with Textmate, you can scroll a huge
>>> file with the mouse without it jumping large portions, and it also
>>> doesn't have rendering glitches. Emacs does. The keyboard scrolling
>>> for me is fine -- I mainly use C-r/s when using the keyboard, anyway.
>>>
>>>
>>
>> I understand exactly what you mean by pixel-based scrolling. This is
>> how many other editors work, e.g. Notepad or Textmate. I'd love to
>> have that as well, but I don't think there is anything like that in
>> Emacs today. Many parts of Emacs are about columns and lines, e.g. the
>> size of frames are "measured" in columns and lines.
>>
>>
>
>

Re: Smooth scrolling

[Deniz Dogan]

2010/7/7 Marcelo de Moraes Serpa <celoserpa@gmail.com>:
> Let's join efforts and ask for it then :)
>
> Is there a place we could submit/vote for feature suggestions for next
> emacs versions?
>

The correct way to do this is probably M-x report-emacs-bug and add
the tag/severity (I can never remember which) "wishlist". I wouldn't
count on it happening any time soon though! :(

-- 
Deniz Dogan

Re: Smooth scrolling

[Jesse W. Wilson]

Perhaps the following could be of use?
http://www.gnu.org/s/emacs/manual/html_node/elisp/Vertical-Scrolling.html

If I type this in a buffer and eval with c-x c-e,
(set-window-vscroll (selected-window) 0.3)

It seems to scroll a fraction of a line downward.

Of course I haven't a clue how it could be incorporated into bindings 
for the scroll wheel.

-- 
------------------------------------------------------------------
Jesse Wilson
Bartels Lab: Ultrafast and Nonlinear Optics
Electrical and Computer Engineering Department
Colorado State University
jessew@engr.colostate.edu


On 7/7/2010 1:21 PM, Deniz Dogan wrote:
> 2010/7/7 Marcelo de Moraes Serpa<celoserpa@gmail.com>:
>    
>> Let's join efforts and ask for it then :)
>>
>> Is there a place we could submit/vote for feature suggestions for next
>> emacs versions?
>>
>>      
> The correct way to do this is probably M-x report-emacs-bug and add
> the tag/severity (I can never remember which) "wishlist". I wouldn't
> count on it happening any time soon though! :(
>
>    

Re: Smooth scrolling

[David Engster]

Jesse W. Wilson writes:
> Perhaps the following could be of use?
> http://www.gnu.org/s/emacs/manual/html_node/elisp/Vertical-Scrolling.html
>
> If I type this in a buffer and eval with c-x c-e,
> (set-window-vscroll (selected-window) 0.3)
>
> It seems to scroll a fraction of a line downward.
>
> Of course I haven't a clue how it could be incorporated into bindings
> for the scroll wheel.

Yes, Emacs can do "fractional" (read: pixel-wise) scrolling with the
set-window-vscroll command you mentioned above. For example,
picture-mode can smooth-scroll an image just fine. However, there are
two caveats: it is slow, and the point must remain visible during
scrolling.

I've fiddled with this stuff a while ago to implement a smoother
scrolling for buffers with images in them. See

http://www.randomsample.de/dru5/node/25
http://www.randomsample.de/dru5/node/26

for how far I've come. Those functions use set-window-vscroll to scroll
the buffer and move point in a way so that it always remains
visible. However, you'll notice that the higher the vscroll value of the
current window, the slower scrolling becomes, so it's of limited
value. Also, it doesn't work well with the other point-moving commands,
so it's currently only useful for read-only buffers.

Regards,
David

Re: Smooth scrolling

[Marcelo de Moraes Serpa]

http://zwell.net/content/emacs.html

This is the nearest to what I'd like, seems to work, although has some
small glitches.

Marcelo.

On Thu, Jul 8, 2010 at 3:51 AM, David Engster <deng@randomsample.de> wrote:
> Jesse W. Wilson writes:
>> Perhaps the following could be of use?
>> http://www.gnu.org/s/emacs/manual/html_node/elisp/Vertical-Scrolling.html
>>
>> If I type this in a buffer and eval with c-x c-e,
>> (set-window-vscroll (selected-window) 0.3)
>>
>> It seems to scroll a fraction of a line downward.
>>
>> Of course I haven't a clue how it could be incorporated into bindings
>> for the scroll wheel.
>
> Yes, Emacs can do "fractional" (read: pixel-wise) scrolling with the
> set-window-vscroll command you mentioned above. For example,
> picture-mode can smooth-scroll an image just fine. However, there are
> two caveats: it is slow, and the point must remain visible during
> scrolling.
>
> I've fiddled with this stuff a while ago to implement a smoother
> scrolling for buffers with images in them. See
>
> http://www.randomsample.de/dru5/node/25
> http://www.randomsample.de/dru5/node/26
>
> for how far I've come. Those functions use set-window-vscroll to scroll
> the buffer and move point in a way so that it always remains
> visible. However, you'll notice that the higher the vscroll value of the
> current window, the slower scrolling becomes, so it's of limited
> value. Also, it doesn't work well with the other point-moving commands,
> so it's currently only useful for read-only buffers.
>
> Regards,
> David
>
>
>

Re: Smooth scrolling

[Andreas Politz]

David Engster <deng@randomsample.de> writes:

> Jesse W. Wilson writes:

> Yes, Emacs can do "fractional" (read: pixel-wise) scrolling with the
> set-window-vscroll command you mentioned above. For example,
> picture-mode can smooth-scroll an image just fine. However, there are
> two caveats: it is slow, and the point must remain visible during
> scrolling.
>

Allowing point to go off-window is like allowing the mouse-pointer to go
off-screen, a nightmare.

-ap

Re: Smooth scrolling

[Marcelo de Moraes Serpa]

Thanks Deniz,

I already did my part. Hopefully they will take it into account and
think about it.

As a side-note, I think emacs has *lots* of potential to be
"mainstream" -- but not in the bad sense. I don't really care if it is
as popular as Textmate or not, and I know it takes guts, time and
effort to actually be productive on emacs, but we all know that, once
we have the skills, it becames the one true editor.

However, I do feel we need to "modernize" many aspects of emacs. I'm
not talking only about the application itself, and I'm not also
talking about huge changes, but we do need to bring emacs to the new
century with some sublte changes like this one, while keeping its
essency, of course.

My 2c,

/Marcelo.
On Wed, Jul 7, 2010 at 2:21 PM, Deniz Dogan <deniz.a.m.dogan@gmail.com> wrote:
> 2010/7/7 Marcelo de Moraes Serpa <celoserpa@gmail.com>:
>> Let's join efforts and ask for it then :)
>>
>> Is there a place we could submit/vote for feature suggestions for next
>> emacs versions?
>>
>
> The correct way to do this is probably M-x report-emacs-bug and add
> the tag/severity (I can never remember which) "wishlist". I wouldn't
> count on it happening any time soon though! :(
>
> --
> Deniz Dogan
>