Re: How do you scroll the screen without moving the cursor ? (the C-E and C-Y keys in vi)

Re: How do you scroll the screen without moving the cursor ? (the C-E and C-Y keys in vi)

[Livin Stephen]

On Oct 3, 3:11 am, "David Lam" <david.k.l...@gmail.com> wrote:
>...
> i saw this...http://www.wlindley.com/gnu/vi and in the first two rows
> theres no listed equivalent
> ...


David,
 C-v is how you scroll one-page-at-a-time, so with numerical arguments
( "C-u 1" [ or "Cu -1" ] ),
here is how I would do it:

C-u 1 C-v for "up", and
C-u -1 C-v for "down" .

I don't know *any* lisp,
 so if I found myself wanting to do this a lot,
 I would probably create a macro and setup a key-binding.

Re: How do you scroll the screen without moving the cursor ? (the C-E and C-Y keys in vi)

[zoltan]

On Oct 3, 7:46 am, Livin Stephen <livin.step...@gmail.com> wrote:
> On Oct 3, 3:11 am, "David Lam" <david.k.l...@gmail.com> wrote:
>
> >...
> > i saw this...http://www.wlindley.com/gnu/vi and in the first two rows
> > theres no listed equivalent
> > ...
>
> David,
>  C-v is how you scroll one-page-at-a-time, so with numerical arguments
> ( "C-u 1" [ or "Cu -1" ] ),
> here is how I would do it:
>
> C-u 1 C-v for "up", and
> C-u -1 C-v for "down" .
>
> I don't know *any* lisp,
>  so if I found myself wanting to do this a lot,
>  I would probably create a macro and setup a key-binding.

You can also use M-v to scroll up.
And C-M-v to scroll down the next buffer

RE: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)

[Parker, Matthew]

This might not be the most elegant... but it works... and I think it is what you have in mind...

Add these to .emacs, and try Control-Alt-n or p

  ;; Navigation Functions
      (defun scroll-up-by-one-line()
        "scroll ahead one line at a time"
        (interactive)
        (scroll-up 1))

      
      (defun scroll-down-by-one-line()
        "scroll ahead one line at a time"
        (interactive)
        (scroll-down 1))

  ;; key bindings

      (global-set-key "\C-\M-n" 'scroll-up-by-one-line)
      (global-set-key "\C-\M-p" 'scroll-down-by-one-line)


Matthew Parker

SEI  | 1 Freedom Valley Drive | Oaks, PA 19456 | p: 610-676-1279 | f: 484-676-1279 | www.seic.com

-----Original Message-----
From: help-gnu-emacs-bounces+mparker=seic.com@gnu.org [mailto:help-gnu-emacs-bounces+mparker=seic.com@gnu.org] On Behalf Of zoltan
Sent: Friday, October 03, 2008 2:43 AM
To: help-gnu-emacs@gnu.org
Subject: Re: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)

On Oct 3, 7:46 am, Livin Stephen <livin.step...@gmail.com> wrote:
> On Oct 3, 3:11 am, "David Lam" <david.k.l...@gmail.com> wrote:
>
> >...
> > i saw this...http://www.wlindley.com/gnu/vi and in the first two rows
> > theres no listed equivalent
> > ...
>
> David,
>  C-v is how you scroll one-page-at-a-time, so with numerical arguments
> ( "C-u 1" [ or "Cu -1" ] ),
> here is how I would do it:
>
> C-u 1 C-v for "up", and
> C-u -1 C-v for "down" .
>
> I don't know *any* lisp,
>  so if I found myself wanting to do this a lot,
>  I would probably create a macro and setup a key-binding.

You can also use M-v to scroll up.
And C-M-v to scroll down the next buffer

Re: How do you scroll the screen without moving the cursor ? (the C-E and C-Y keys in vi)

[Rodolfo Medina]

...how do you scroll the screen without moving point, also in the sense that
you do, say, five times C-v and then five times M-v and find the cursor in the
*same* place as it was before the first C-v...?

I found two packages that do that: pager.el and scroll-in-place.el, but the
side unwished effect is that the `next-screen-context-lines' stops working
properly in TeX and info buffers: you don't have any more the two default lines
of continuity when scrolling by screenfuls, but less, and variable.

Anyone met the same problem?
Rodolfo

Re: How do you scroll the screen without moving the cursor ? (the C-E and C-Y keys in vi)

[Rupert Swarbrick]

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Rodolfo Medina <rodolfo.medina@gmail.com> writes:

> ...how do you scroll the screen without moving point, also in the
> sense that you do, say, five times C-v and then five times M-v and
> find the cursor in the *same* place as it was before the first C-v...?
>

I'm afraid I don't actually know the answer to this question (although
I'm sure there will be one). I was also slightly suprised when reading
it that this had never irritated me.

But then I realised what I do: Before starting to scroll, I hit C-Space
to set a mark. Then I wander round the file to my hearts content, not
even necessarily returning to where I started before hitting C-u C-Space
and being back and with point "unmoved".

Maybe this is a useful different way of solving your problem.

Rupert

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Re: How do you scroll the screen without moving the cursor ? (the C-E and C-Y keys in vi)

[Rodolfo Medina]

Rodolfo Medina <rodolfo.medina@gmail.com> writes:

> ...how do you scroll the screen without moving point, also in the sense that
> you do, say, five times C-v and then five times M-v and find the cursor in the
> *same* place as it was before the first C-v...?
>
> I found two packages that do that: pager.el and scroll-in-place.el, but the
> side unwished effect is that the `next-screen-context-lines' stops working
> properly in TeX and info buffers: you don't have any more the two default
> lines of continuity when scrolling by screenfuls, but less, and variable.
>
> Anyone met the same problem?



Rupert Swarbrick <rswarbrick@gmail.com> writes:

> I'm afraid I don't actually know the answer to this question (although
> I'm sure there will be one). I was also slightly suprised when reading
> it that this had never irritated me.
>
> But then I realised what I do: Before starting to scroll, I hit C-Space
> to set a mark. Then I wander round the file to my hearts content, not
> even necessarily returning to where I started before hitting C-u C-Space
> and being back and with point "unmoved".
>
> Maybe this is a useful different way of solving your problem.



Hey, that's great!  Thanks
Rodolfo

Re: How do you scroll the screen without moving the cursor ? (the C-E and C-Y keys in vi)

[Joe Casadonte]

I wrote these years ago; maybe they will help?


(defun scroll-in-place (scroll-up)
  "Scroll window up (or down) without moving point (if possible).

SCROLL-Up is non-nil to scroll up one line, nil to scroll down."
  (interactive)
  (let ((pos (point))
		(col (current-column))
		(up-or-down (if scroll-up 1 -1)))
	(scroll-up up-or-down)
	(if (pos-visible-in-window-p pos)
		(goto-char pos)
	  (if (or (eq last-command 'next-line)
			  (eq last-command 'previous-line))
		  (move-to-column temporary-goal-column)
		(move-to-column col)
		(setq temporary-goal-column col))
	  (setq this-command 'next-line))))

;;;; ------------------------------------------------------------------------
(defun scroll-up-in-place ()
  "Scroll window up without moving point (if possible)."
  (interactive)
  (scroll-in-place t))

;;;; ------------------------------------------------------------------------
(defun scroll-down-in-place ()
  "Scroll window up without moving point (if possible)."
  (interactive)
  (scroll-in-place nil))

(global-set-key (read-kbd-macro "M-<down>") 'scroll-up-in-place)
(global-set-key (read-kbd-macro "M-<up>") 'scroll-down-in-place)


--
Regards,


joe
Joe Casadonte
jcasadonte@northbound-train.com

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Re: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)

[Chris McMahan]

If that's not what you have in mind, I've been using these for some
time. They keep the cursor in place and move the text underneath it.

(defun scroll-down-in-place (n)
  (interactive "p")
  (previous-line n)
  (scroll-down n))

(defun scroll-up-in-place (n)
  (interactive "p")
  (next-line n)
  (scroll-up n))

(global-set-key "\M-n" 'scroll-up-in-place)
(global-set-key "\M-p" 'scroll-down-in-place)

- Chris

"Parker, Matthew" <MParker@seic.com> writes:

> This might not be the most elegant... but it works... and I think it is what you have in mind...
>
> Add these to .emacs, and try Control-Alt-n or p
>
>   ;; Navigation Functions
>       (defun scroll-up-by-one-line()
>         "scroll ahead one line at a time"
>         (interactive)
>         (scroll-up 1))
>
>       
>       (defun scroll-down-by-one-line()
>         "scroll ahead one line at a time"
>         (interactive)
>         (scroll-down 1))
>
>   ;; key bindings
>
>       (global-set-key "\C-\M-n" 'scroll-up-by-one-line)
>       (global-set-key "\C-\M-p" 'scroll-down-by-one-line)
>
>
> Matthew Parker
>
> SEI  | 1 Freedom Valley Drive | Oaks, PA 19456 | p: 610-676-1279 | f: 484-676-1279 | www.seic.com
>
> -----Original Message-----
> From: help-gnu-emacs-bounces+mparker=seic.com@gnu.org [mailto:help-gnu-emacs-bounces+mparker=seic.com@gnu.org] On Behalf Of zoltan
> Sent: Friday, October 03, 2008 2:43 AM
> To: help-gnu-emacs@gnu.org
> Subject: Re: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)
>
> On Oct 3, 7:46 am, Livin Stephen <livin.step...@gmail.com> wrote:
>> On Oct 3, 3:11 am, "David Lam" <david.k.l...@gmail.com> wrote:
>>
>> >...
>> > i saw this...http://www.wlindley.com/gnu/vi and in the first two rows
>> > theres no listed equivalent
>> > ...
>>
>> David,
>>  C-v is how you scroll one-page-at-a-time, so with numerical arguments
>> ( "C-u 1" [ or "Cu -1" ] ),
>> here is how I would do it:
>>
>> C-u 1 C-v for "up", and
>> C-u -1 C-v for "down" .
>>
>> I don't know *any* lisp,
>>  so if I found myself wanting to do this a lot,
>>  I would probably create a macro and setup a key-binding.
>
> You can also use M-v to scroll up.
> And C-M-v to scroll down the next buffer
>
>

-- 
     (.   .)
  =ooO=(_)=Ooo=====================================
  Chris McMahan | first_initiallastname@one.dot.net
  =================================================

Re: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)

[Paul R]

Chris> If that's not what you have in mind, I've been using these for
Chris> some time. They keep the cursor in place and move the text
Chris> underneath it.

Chris> (defun scroll-down-in-place (n) (interactive "p")
Chris> (previous-line n) (scroll-down n))

Chris> (defun scroll-up-in-place (n) (interactive "p") (next-line n)
Chris> (scroll-up n))

To avoid weird behaviour when seeing ends of your buffer, use the code
below.

(global-set-key [down] (lambda ()
			 (interactive)
			 (next-line 1)
			 (unless (eq (window-end) (point-max))
			   (scroll-up 1))))
(global-set-key [up] (lambda ()
		       (interactive)
		       (previous-line 1)
		       (unless (eq (window-start) (point-min))
			 (scroll-down 1))))

-- 
  Paul

Re: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)

[Chris McMahan]

Paul R <paul.r.ml@gmail.com> writes:

> Chris> If that's not what you have in mind, I've been using these for
> Chris> some time. They keep the cursor in place and move the text
> Chris> underneath it.
>
> Chris> (defun scroll-down-in-place (n) (interactive "p")
> Chris> (previous-line n) (scroll-down n))
>
> Chris> (defun scroll-up-in-place (n) (interactive "p") (next-line n)
> Chris> (scroll-up n))
>
> To avoid weird behaviour when seeing ends of your buffer, use the code
> below.
>
> (global-set-key [down] (lambda ()
> 			 (interactive)
> 			 (next-line 1)
> 			 (unless (eq (window-end) (point-max))
> 			   (scroll-up 1))))
> (global-set-key [up] (lambda ()
> 		       (interactive)
> 		       (previous-line 1)
> 		       (unless (eq (window-start) (point-min))
> 			 (scroll-down 1))))

Excellent! Thank you!

BTW, where can I get info on the key syntax you're using? [down] and
[up]...

- Chris

-- 
     (.   .)
  =ooO=(_)=Ooo=====================================
  Chris McMahan | first_initiallastname@one.dot.net
  =================================================

Re: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)

[David Lam]

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aww cool thanks... i just tried the stuffs

this is what i ended up with ->

;; ^E in Vi
(defun ctrl-e-in-vi (n)
 (interactive "p")
 (scroll-down n))

;; ^Y in Vi
(defun ctrl-y-in-vi (n)
 (interactive "p")
 (scroll-up n))

(global-set-key "\M-n" 'ctrl-y-in-vi)
(global-set-key "\M-p" 'ctrl-e-in-vi)






On Fri, Oct 3, 2008 at 1:07 PM, Chris McMahan <
first_initiallastname@one.dot.net> wrote:

> Paul R <paul.r.ml@gmail.com> writes:
>
> > Chris> If that's not what you have in mind, I've been using these for
> > Chris> some time. They keep the cursor in place and move the text
> > Chris> underneath it.
> >
> > Chris> (defun scroll-down-in-place (n) (interactive "p")
> > Chris> (previous-line n) (scroll-down n))
> >
> > Chris> (defun scroll-up-in-place (n) (interactive "p") (next-line n)
> > Chris> (scroll-up n))
> >
> > To avoid weird behaviour when seeing ends of your buffer, use the code
> > below.
> >
> > (global-set-key [down] (lambda ()
> >                        (interactive)
> >                        (next-line 1)
> >                        (unless (eq (window-end) (point-max))
> >                          (scroll-up 1))))
> > (global-set-key [up] (lambda ()
> >                      (interactive)
> >                      (previous-line 1)
> >                      (unless (eq (window-start) (point-min))
> >                        (scroll-down 1))))
>
> Excellent! Thank you!
>
> BTW, where can I get info on the key syntax you're using? [down] and
> [up]...
>
> - Chris
>
> --
>     (.   .)
>  =ooO=(_)=Ooo=====================================
>  Chris McMahan | first_initiallastname@one.dot.net
>  =================================================
>

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Re: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)

[Paul R]

On Fri, 03 Oct 2008 16:07:24 -0400, Chris McMahan <first_initiallastname@one.dot.net> said:
Chris> BTW, where can I get info on the key syntax you're using?
Chris> [down] and [up]...

In emacs documentation, look for "key bindings".
Also, if you want an in-depth review of emacs-all-flavour-all-versions
key bindings syntax, read this good ressource :
     http://tiny-tools.sourceforge.net/emacs-keys.html

-- 
  Paul

Re: How do you scroll the screen without moving the cursor ? (theC-E and C-Y keys in vi)

[Livin Stephen]

On Oct 3, 9:09 pm, Paul R <paul.r...@gmail.com> wrote:
> Chris> If that's not what you have in mind, I've been using these for
> Chris> some time. They keep the cursor in place and move the text
> Chris> underneath it.
>
> Chris> (defun scroll-down-in-place (n) (interactive "p")
> Chris> (previous-line n) (scroll-down n))
>
> Chris> (defun scroll-up-in-place (n) (interactive "p") (next-line n)
> Chris> (scroll-up n))
>
> To avoid weird behaviour when seeing ends of your buffer, use the code
> below.
>
> (global-set-key [down] (lambda ()
>                          (interactive)
>                          (next-line 1)
>                          (unless (eq (window-end) (point-max))
>                            (scroll-up 1))))
> (global-set-key [up] (lambda ()
>                        (interactive)
>                        (previous-line 1)
>                        (unless (eq (window-start) (point-min))
>                          (scroll-down 1))))
>
> --
>   Paul

The initial request from David Lam was for scrolling-in-place such
that
 the cursor remained "in place" with respect to the text - not with
respect to the frame/window.

In VI, C-e (C-y is the counterpart),
1. scrolls the page up by line, AND
2. moves the up cursor ALSO by one line - so that it stays at the same
character at which it was originally.

In the lisp examples (thanks for them!), I commented out "(previous-
line 1)" and "(next-line 1)" to achieve this.

 I *do* also like what your original lisp samples do.