hollen@spot.megatek.uucp (Dion Hollenbeck) (10/29/88)
Can the method of scrolling be changed in GNU-emacs? It currently
repaints the entire screen and moves the cursor to the center
when scrolling up or down is needed. Can it be made to scroll
one line at a time up or down like a regular terminal?
Dion Hollenbeck (619) 455-5590 x2814
Megatek Corporation, 9645 Scranton Road, San Diego, CA 92121
seismo!s3sun!megatek!hollen
ames!scubed/nate@mipos2.intel.com (Nate Hess) (10/30/88)
In article <392@megatek.UUCP>, hollen@spot (Dion Hollenbeck) writes: >Can the method of scrolling be changed in GNU-emacs? It currently >repaints the entire screen and moves the cursor to the center >when scrolling up or down is needed. Can it be made to scroll >one line at a time up or down like a regular terminal? In GNU Emacs, there is usually a variable that controls behavior such as this. What I did to discover the variable name was 'C-h v scroll TAB', which completed to 'scroll-step'. Upon pressing RET, I was given a help buffer containing: scroll-step's value is 0 Documentation: *The number of lines to try scrolling a window by when point moves out. If that fails to bring point back on screen, point is centered instead. If this is zero, point is always centered after it moves off screen. So, just do a (setq scroll-step 1) to get what you want. --woodstock -- "What I like is when you're looking and thinking and looking and thinking...and suddenly you wake up." - Hobbes woodstock@sc.intel.com ...!{decwrl|hplabs!oliveb|amd}!intelca!mipos3!nate
spolsky-joel@CS.YALE.EDU (Joel Spolsky) (10/31/88)
In article <3097@mipos3.intel.com> woodstock@sc.intel.com (Nate Hess) writes: | | In article <392@megatek.UUCP>, hollen@spot (Dion Hollenbeck) writes: | | | | Can the method of scrolling be changed in GNU-emacs? It currently | | repaints the entire screen and moves the cursor to the center | | when scrolling up or down is needed. Can it be made to scroll | | one line at a time up or down like a regular terminal? | | | ... just do a | | (setq scroll-step 1) | | to get what you want. | This works ok in *many* cases but not always. For example, if emacs decides that scrolling one line is not enough (e.g., when the line to be brought in is longer than the screen width and wraps to the next physical line), it will still scroll half a screen. +----------------+---------------------------------------------------+ | Joel Spolsky | bitnet: spolsky@yalecs uucp: ...!yale!spolsky | | | arpa: spolsky@yale.edu voicenet: 203-436-1483 | +----------------+---------------------------------------------------+ #include <disclaimer.h>
beede@pavo.SRC.Honeywell.COM (Michael Beede) (10/31/88)
Execute C-H C-V scroll-step. Include (setq scroll-step 1) in your .emacs to get fairly reasonable behavior. If you drive the cursor off the screen too fast, recenter will take place anyway. Mike Beede MN55-7282 Secure Computing Technology Center Honeywell Systems & Research Center (612) 782-7147 2855 Anthony Lane South - Suite 130 Minneapolis MN beede@src.honeywell.com
bug@bucsb.UUCP (Z^) (10/31/88)
In article <3097@mipos3.intel.com> woodstock@sc.intel.com (Nate Hess) writes: >In article <392@megatek.UUCP>, hollen@spot (Dion Hollenbeck) writes: >>Can the method of scrolling be changed in GNU-emacs? It currently >>repaints the entire screen and moves the cursor to the center >>when scrolling up or down is needed. Can it be made to scroll >>one line at a time up or down like a regular terminal? > >In GNU Emacs, there is usually a variable that controls behavior such as >this. What I did to discover the variable name was >'C-h v scroll TAB', which completed to 'scroll-step'. Upon pressing >RET, I was given a help buffer containing: > >scroll-step's value is 0 > >Documentation: >*The number of lines to try scrolling a window by when point moves out. >If that fails to bring point back on screen, point is centered instead. >If this is zero, point is always centered after it moves off screen. > > >So, just do a > >(setq scroll-step 1) > >to get what you want. > i tried this and it works when scrolling with arrows keys very badly... if i scroll to fast it reverts back to the centering method.... so my question is ..can this be fixed so no matter how fast i scroll with the arrow keys it will only go one line at a time? -Jay- -- -Jay- ************************************************************************** Remember- to err is human...... to moo is bovine. **************************************************************************
kjones@talos.UUCP (Kyle Jones) (11/01/88)
In article <392@megatek.UUCP>, hollen@spot (Dion Hollenbeck) writes: >Can it be made to scroll one line at a time up or down like a regular >terminal? woodstock, et. al. >(setq scroll-step 1) In article <2120@bucsb.UUCP> bug@bucsb.bu.edu (Jay Wasserman) writes: >i tried this and it works when scrolling with arrows keys very badly... >if i scroll to fast it reverts back to the centering method.... >so my question is ..can this be fixed so no matter how fast i scroll >with the arrow keys it will only go one line at a time? No, unless you're willing (and capable!) of hacking the Emacs display code. Not too long ago someone else wanted one-step scrolling but they wanted it in a shell buffer, which isn't what you asked for. The only use that I can think of for the type of one-step scrolling you want is searching for a particular point in a file. That can be accomplished much easier and faster with a fixed string or regular expression search.
norden@oucsace.cs.OHIOU.EDU (Jeffrey Norden) (11/04/88)
In article <347@talos.UUCP> kjones@talos.UUCP (Kyle Jones) writes: >>Can it be made to scroll one line at a time up or down like a regular >>terminal? <discussion of scroll-step omitted> >> ..can this be fixed so no matter how fast i scroll >>with the arrow keys it will only go one line at a time? >No, unless you're willing (and capable!) of hacking the Emacs display >code. Here is a hackey way to get emacs to (almost) always scroll one line at a time. Put the following re-defintions of next-line and prev-line in your .emacs file: ------------------------------------------------------------------------------ ;; My own versions of next-line and previous-line. These almost never recenter ;; the buffer. (defun next-line (arg) (interactive"p") (if (> arg 0) (setq dir 1) (setq dir -1)) (while (not (pos-visible-in-window-p (save-excursion (line-move arg) (point)))) (scroll-up dir)) (line-move arg)) (defun previous-line (arg) (interactive"p") (next-line (- arg))) ------------------------------------------------------------------------------ My own feeling is that scroll-step should be extended to allow you to do this. A reasonable extension would be to have (setq scroll-step -1) cause emacs to always scroll by the minimum number of lines needed to bring the point back onto the screen. I've been meaning to do this for a while (hacking at the c-code is necessary), I might have some time next month. If I'm successful, I'll post the results. -Jeff Norden, norden@ace.cs.ohio.edu Dept of Math, Ohio Univ, Athens OH 45701
tim@lucretia.esa.oz (Tim Bunce) (11/21/88)
In article <3097@mipos3.intel.com> woodstock@sc.intel.com (Nate Hess) writes: >In article <392@megatek.UUCP>, hollen@spot (Dion Hollenbeck) writes: >>Can the method of scrolling be changed in GNU-emacs? It currently >>repaints the entire screen and moves the cursor to the center >>when scrolling up or down is needed. Can it be made to scroll >>one line at a time up or down like a regular terminal? >... >So, just do a >(setq scroll-step 1) >to get what you want. >... As an aside, VAXTPU on VMS machines has a very flexible approach to scrolling that the GNU project may like to emulate. Under TPU you can not only specify by how much the screen should scroll (up or down) but also at what point a cursor motion will trigger a scroll. For example, you can specify that the window should scroll down by one line when ever the cursor tries to move onto the top line of the window and similarly for scrolling down. (This is my favourite set-up -- it means that you can always some of the context of the line that you are on.) This approach also allows you to keep the cursor centered in the window, or on the 2nd line or last line or ... I have not looked at the emacs code but I sure someone could produce and publish a simple patch. What do you think? -- Tim Bunce: tim@attila.oz.AU (tim%attila.oz.AU@UUNET.UU.NET) --------- {uunet,mcvax,ukc,nttlab}!munnari!attila.oz!tim JANET: (POST) tim%au.oz.attila@EAN-RELAY (MAIL) EAN%"tim@au.oz.attila"