mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-24 07:20:37 +00:00
e1ac4066d1
* lisp/completion.el (dynamic-completion-mode): * lisp/dirtrack.el (dirtrack-debug-mode): * lisp/electric.el (electric-layout-mode): * lisp/epa-mail.el (epa-mail-mode, epa-global-mail-mode): * lisp/face-remap.el (text-scale-mode, buffer-face-mode): * lisp/iimage.el (iimage-mode): * lisp/image-mode.el (image-transform-mode): * lisp/minibuffer.el (completion-in-region-mode): * lisp/scroll-lock.el (scroll-lock-mode): * lisp/simple.el (next-error-follow-minor-mode): * lisp/tar-mode.el (tar-subfile-mode): * lisp/tooltip.el (tooltip-mode): * lisp/vcursor.el (vcursor-use-vcursor-map): * lisp/wid-browse.el (widget-minor-mode): * lisp/emulation/tpu-edt.el (tpu-edt-mode): * lisp/emulation/tpu-extras.el (tpu-cursor-free-mode): * lisp/international/iso-ascii.el (iso-ascii-mode): * lisp/language/thai-util.el (thai-word-mode): * lisp/mail/supercite.el (sc-minor-mode): * lisp/net/goto-addr.el (goto-address-mode): * lisp/net/rcirc.el (rcirc-multiline-minor-mode, rcirc-track-minor-mode): * lisp/progmodes/cwarn.el (cwarn-mode): * lisp/progmodes/flymake.el (flymake-mode): * lisp/progmodes/glasses.el (glasses-mode): * lisp/progmodes/hideshow.el (hs-minor-mode): * lisp/progmodes/pascal.el (pascal-outline-mode): * lisp/textmodes/enriched.el (enriched-mode): * lisp/vc/smerge-mode.el (smerge-mode): Doc fixes (minor mode argument). * etc/NEWS: Related markup.
129 lines
4.7 KiB
EmacsLisp
129 lines
4.7 KiB
EmacsLisp
;;; scroll-lock.el --- Scroll lock scrolling.
|
|
|
|
;; Copyright (C) 2005-2012 Free Software Foundation, Inc.
|
|
|
|
;; Author: Ralf Angeli <angeli@iwi.uni-sb.de>
|
|
;; Maintainer: FSF
|
|
;; Created: 2005-06-18
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software: you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation, either version 3 of the License, or
|
|
;; (at your option) any later version.
|
|
|
|
;; GNU Emacs is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;; By activating Scroll Lock mode, keys for moving point by line or
|
|
;; paragraph will scroll the buffer by the respective amount of lines
|
|
;; instead. Point will be kept vertically fixed relative to window
|
|
;; boundaries.
|
|
|
|
;;; Code:
|
|
|
|
(defvar scroll-lock-mode-map
|
|
(let ((map (make-sparse-keymap)))
|
|
(define-key map [remap next-line] 'scroll-lock-next-line)
|
|
(define-key map [remap previous-line] 'scroll-lock-previous-line)
|
|
(define-key map [remap forward-paragraph] 'scroll-lock-forward-paragraph)
|
|
(define-key map [remap backward-paragraph] 'scroll-lock-backward-paragraph)
|
|
map)
|
|
"Keymap for Scroll Lock mode.")
|
|
|
|
(defvar scroll-lock-preserve-screen-pos-save scroll-preserve-screen-position
|
|
"Used for saving the state of `scroll-preserve-screen-position'.")
|
|
(make-variable-buffer-local 'scroll-lock-preserve-screen-pos-save)
|
|
|
|
(defvar scroll-lock-temporary-goal-column 0
|
|
"Like `temporary-goal-column' but for scroll-lock-* commands.")
|
|
|
|
;;;###autoload
|
|
(define-minor-mode scroll-lock-mode
|
|
"Buffer-local minor mode for pager-like scrolling.
|
|
With a prefix argument ARG, enable the mode if ARG is positive,
|
|
and disable it otherwise. If called from Lisp, enable the mode
|
|
if ARG is omitted or nil. When enabled, keys that normally move
|
|
point by line or paragraph will scroll the buffer by the
|
|
respective amount of lines instead and point will be kept
|
|
vertically fixed relative to window boundaries during scrolling."
|
|
:lighter " ScrLck"
|
|
:keymap scroll-lock-mode-map
|
|
(if scroll-lock-mode
|
|
(progn
|
|
(setq scroll-lock-preserve-screen-pos-save
|
|
scroll-preserve-screen-position)
|
|
(set (make-local-variable 'scroll-preserve-screen-position) 'always))
|
|
(setq scroll-preserve-screen-position
|
|
scroll-lock-preserve-screen-pos-save)))
|
|
|
|
(defun scroll-lock-update-goal-column ()
|
|
"Update `scroll-lock-temporary-goal-column' if necessary."
|
|
(unless (memq last-command '(scroll-lock-next-line
|
|
scroll-lock-previous-line
|
|
scroll-lock-forward-paragraph
|
|
scroll-lock-backward-paragraph))
|
|
(setq scroll-lock-temporary-goal-column (current-column))))
|
|
|
|
(defun scroll-lock-move-to-column (column)
|
|
"Like `move-to-column' but cater for wrapped lines."
|
|
(if (or (bolp)
|
|
;; Start of a screen line.
|
|
(not (zerop (mod (- (point) (line-beginning-position))
|
|
(window-width)))))
|
|
(move-to-column column)
|
|
(forward-char (min column (- (line-end-position) (point))))))
|
|
|
|
(defun scroll-lock-next-line (&optional arg)
|
|
"Scroll up ARG lines keeping point fixed."
|
|
(interactive "p")
|
|
(or arg (setq arg 1))
|
|
(scroll-lock-update-goal-column)
|
|
(if (pos-visible-in-window-p (point-max))
|
|
(forward-line arg)
|
|
(scroll-up arg))
|
|
(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
|
|
|
|
(defun scroll-lock-previous-line (&optional arg)
|
|
"Scroll up ARG lines keeping point fixed."
|
|
(interactive "p")
|
|
(or arg (setq arg 1))
|
|
(scroll-lock-update-goal-column)
|
|
(condition-case nil
|
|
(scroll-down arg)
|
|
(beginning-of-buffer (forward-line (- arg))))
|
|
(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
|
|
|
|
(defun scroll-lock-forward-paragraph (&optional arg)
|
|
"Scroll down ARG paragraphs keeping point fixed."
|
|
(interactive "p")
|
|
(or arg (setq arg 1))
|
|
(scroll-lock-update-goal-column)
|
|
(scroll-up (count-screen-lines (point) (save-excursion
|
|
(forward-paragraph arg)
|
|
(point))))
|
|
(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
|
|
|
|
(defun scroll-lock-backward-paragraph (&optional arg)
|
|
"Scroll up ARG paragraphs keeping point fixed."
|
|
(interactive "p")
|
|
(or arg (setq arg 1))
|
|
(scroll-lock-update-goal-column)
|
|
(let ((goal (save-excursion (backward-paragraph arg) (point))))
|
|
(condition-case nil
|
|
(scroll-down (count-screen-lines goal (point)))
|
|
(beginning-of-buffer (goto-char goal))))
|
|
(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
|
|
|
|
(provide 'scroll-lock)
|
|
|
|
;;; scroll-lock.el ends here
|