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* lisp/align.el (align-mode-rules-list) (align-mode-exclude-rules-list): * lisp/bookmark.el (bookmark-current-bookmark) (bookmark-annotation-name) (bookmark--annotation-from-bookmark-list): * lisp/calc/calc-embed.el (calc-embedded-all-active) (calc-embedded-some-active): * lisp/comint.el (comint-password-function): * lisp/completion.el (completion-syntax-table): * lisp/dframe.el (dframe-track-mouse-function) (dframe-help-echo-function, dframe-mouse-click-function) (dframe-mouse-position-function, dframe-timer) (dframe-attached-frame, dframe-controlled): * lisp/ehelp.el (electric-help-orig-major-mode): * lisp/eshell/esh-util.el (eshell-path-env): * lisp/expand.el (expand-pos, expand-index, expand-point): * lisp/face-remap.el (text-scale-mode-remapping) (text-scale-mode-lighter, text-scale-mode-amount) (text-scale-remap-header-line, buffer-face-mode-remapping): * lisp/ffap.el (ffap-menu-alist): * lisp/files-x.el (connection-local-variables-alist): * lisp/foldout.el (foldout-fold-list, foldout-mode-line-string): * lisp/follow.el (follow-start-end-invalid): * lisp/forms.el (forms--mode-setup): * lisp/gnus/message.el (message-cross-post-old-target) (message-options): * lisp/help-mode.el (help-xref-stack, help-xref-forward-stack) (help-xref-stack-item, help-xref-stack-forward-item): * lisp/hexl.el (hexl-mode--old-var-vals, hexl-ascii-overlay): * lisp/hilit-chg.el (hilit-chg-string): * lisp/ido.el (ido-eoinput): * lisp/imenu.el (imenu-generic-expression) (imenu-create-index-function, imenu-default-goto-function) (imenu-prev-index-position-function) (imenu-extract-index-name-function, imenu-name-lookup-function) (imenu-syntax-alist, imenu-case-fold-search): * lisp/jka-compr.el (jka-compr-really-do-compress): * lisp/language/ethio-util.el (ethio-prefer-ascii-space): * lisp/leim/quail/hangul.el (hangul-input-method-help-text): * lisp/leim/quail/japanese.el (quail-japanese-package-saved): * lisp/linum.el (linum-overlays, linum-available): * lisp/man.el (Man-original-frame, Man-arguments, Man--sections) (Man--refpages, Man-page-list, Man-current-page) (Man-page-mode-string): * lisp/pcomplete.el (pcomplete-current-completions) (pcomplete-last-completion-length) (pcomplete-last-completion-stub, pcomplete-last-completion-raw) (pcomplete-last-window-config, pcomplete-window-restore-timer): * lisp/reveal.el (reveal-open-spots, reveal-last-tick): * lisp/ruler-mode.el (ruler-mode): * lisp/scroll-lock.el (scroll-lock-preserve-screen-pos-save): * lisp/server.el (server-buffer-clients, server-existing-buffer): * lisp/tab-line.el (tab-line-exclude): * lisp/tar-mode.el (tar-data-buffer, tar-data-swapped): * lisp/thumbs.el (thumbs-current-tmp-filename) (thumbs-current-image-filename, thumbs-extra-images) (thumbs-image-num, thumbs-buffer, thumbs-marked-list): * lisp/tutorial.el (tutorial--point-before-chkeys) (tutorial--point-after-chkeys, tutorial--lang): * lisp/url/url-vars.el (url-current-object) (url-current-mime-headers, url-current-lastloc): * lisp/view.el (view-mode, view-old-buffer-read-only) (view-old-Helper-return-blurb, view-page-size) (view-half-page-size, view-last-regexp, view-return-to-alist) (view-exit-action, view-overlay): * lisp/wid-edit.el (widget-global-map, widget-field-new) (widget-field-list, widget-field-last, widget-field-was): * lisp/woman.el (woman-imenu-done): Prefer defvar-local.
141 lines
5.1 KiB
EmacsLisp
141 lines
5.1 KiB
EmacsLisp
;;; scroll-lock.el --- Scroll lock scrolling. -*- lexical-binding:t -*-
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;; Copyright (C) 2005-2021 Free Software Foundation, Inc.
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;; Author: Ralf Angeli <angeli@iwi.uni-sb.de>
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;; Maintainer: emacs-devel@gnu.org
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;; Created: 2005-06-18
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; By activating Scroll Lock mode, keys for moving point by line or
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;; paragraph will scroll the buffer by the respective amount of lines
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;; instead. Point will be kept vertically fixed relative to window
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;; boundaries.
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;;; Code:
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(defvar scroll-lock-mode-map
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(let ((map (make-sparse-keymap)))
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(define-key map [remap next-line] 'scroll-lock-next-line)
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(define-key map [remap previous-line] 'scroll-lock-previous-line)
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(define-key map [remap forward-paragraph] 'scroll-lock-forward-paragraph)
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(define-key map [remap backward-paragraph] 'scroll-lock-backward-paragraph)
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(define-key map [S-down] 'scroll-lock-next-line-always-scroll)
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map)
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"Keymap for Scroll Lock mode.")
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(defvar-local scroll-lock-preserve-screen-pos-save scroll-preserve-screen-position
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"Used for saving the state of `scroll-preserve-screen-position'.")
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(defvar scroll-lock-temporary-goal-column 0
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"Like `temporary-goal-column' but for scroll-lock-* commands.")
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;;;###autoload
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(define-minor-mode scroll-lock-mode
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"Buffer-local minor mode for pager-like scrolling.
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When enabled, keys that normally move point by line or paragraph
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will scroll the buffer by the respective amount of lines instead
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and point will be kept vertically fixed relative to window
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boundaries during scrolling.
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Note that the default key binding to Scroll_Lock will not work on
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MS-Windows systems if `w32-scroll-lock-modifier' is non-nil."
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:lighter " ScrLck"
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:keymap scroll-lock-mode-map
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(if scroll-lock-mode
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(progn
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(setq scroll-lock-preserve-screen-pos-save
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scroll-preserve-screen-position)
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(setq-local scroll-preserve-screen-position 'always))
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(setq scroll-preserve-screen-position
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scroll-lock-preserve-screen-pos-save)))
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(defun scroll-lock-update-goal-column ()
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"Update `scroll-lock-temporary-goal-column' if necessary."
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(unless (memq last-command '(scroll-lock-next-line
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scroll-lock-previous-line
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scroll-lock-forward-paragraph
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scroll-lock-backward-paragraph))
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(setq scroll-lock-temporary-goal-column (current-column))))
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(defun scroll-lock-move-to-column (column)
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"Like `move-to-column' but cater for wrapped lines."
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(if (or (bolp)
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;; Start of a screen line.
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(not (zerop (mod (- (point) (line-beginning-position))
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(window-width)))))
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(move-to-column column)
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(forward-char (min column (- (line-end-position) (point))))))
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(defun scroll-lock-next-line-always-scroll (&optional arg)
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"Scroll up ARG lines keeping point fixed."
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(interactive "p")
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(or arg (setq arg 1))
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(scroll-lock-update-goal-column)
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(condition-case nil
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(scroll-up arg)
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(end-of-buffer (goto-char (point-max)) (recenter 1)))
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(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
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(defun scroll-lock-next-line (&optional arg)
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"Scroll up ARG lines keeping point fixed."
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(interactive "p")
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(or arg (setq arg 1))
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(scroll-lock-update-goal-column)
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(if (pos-visible-in-window-p (point-max))
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(forward-line arg)
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(scroll-up arg))
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(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
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(defun scroll-lock-previous-line (&optional arg)
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"Scroll up ARG lines keeping point fixed."
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(interactive "p")
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(or arg (setq arg 1))
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(scroll-lock-update-goal-column)
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(condition-case nil
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(scroll-down arg)
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(beginning-of-buffer (forward-line (- arg))))
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(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
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(defun scroll-lock-forward-paragraph (&optional arg)
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"Scroll down ARG paragraphs keeping point fixed."
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(interactive "p")
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(or arg (setq arg 1))
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(scroll-lock-update-goal-column)
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(scroll-up (count-screen-lines (point) (save-excursion
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(forward-paragraph arg)
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(point))))
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(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
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(defun scroll-lock-backward-paragraph (&optional arg)
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"Scroll up ARG paragraphs keeping point fixed."
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(interactive "p")
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(or arg (setq arg 1))
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(scroll-lock-update-goal-column)
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(let ((goal (save-excursion (backward-paragraph arg) (point))))
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(condition-case nil
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(scroll-down (count-screen-lines goal (point)))
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(beginning-of-buffer (goto-char goal))))
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(scroll-lock-move-to-column scroll-lock-temporary-goal-column))
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(provide 'scroll-lock)
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;;; scroll-lock.el ends here
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