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* lisp/apropos.el (apropos-print): * lisp/buff-menu.el (Buffer-menu-mode): * lisp/calc/calc.el (calc-trail-buffer): * lisp/chistory.el (command-history-mode): * lisp/dabbrev.el: * lisp/dframe.el (dframe-frame-mode): * lisp/doc-view.el (doc-view-presentation-mode): * lisp/ebuff-menu.el (electric-buffer-menu-mode) (electric-buffer-update-highlight): * lisp/edmacro.el (edit-kbd-macro): * lisp/face-remap.el (buffer-face-set, buffer-face-toggle): * lisp/files.el: (find-file-noselect-1, hack-local-variables-confirm) (set-visited-file-name, revert-buffer--default): * lisp/filesets.el (filesets-spawn-external-viewer): * lisp/find-dired.el (find-dired): * lisp/find-lisp.el (find-lisp-find-dired-internal): * lisp/finder.el (finder-mode): * lisp/font-core.el (font-lock-default-function): * lisp/format.el (format-annotate-function): * lisp/help-fns.el (describe-variable): * lisp/help-mode.el (help-mode): * lisp/icomplete.el (icomplete-minibuffer-setup) (icomplete--in-region-setup): * lisp/ido.el (ido-completion-help, ido-tidy): * lisp/international/robin.el (robin-activate): * lisp/leim/quail/hangul.el (hangul-input-method-activate): * lisp/leim/quail/uni-input.el (ucs-input-activate): * lisp/man.el (Man-mode): * lisp/master.el (master-set-slave): * lisp/minibuffer.el (minibuffer-completion-help) (read-file-name-default): * lisp/outline.el (outline-minor-mode): * lisp/pcomplete.el (pcomplete-comint-setup): * lisp/proced.el (proced-mode): * lisp/recentf.el (recentf-edit-list, recentf-open-files-items): * lisp/replace.el (occur-1): * lisp/reveal.el (reveal-mode): * lisp/ruler-mode.el (ruler--save-header-line-format): * lisp/scroll-lock.el (scroll-lock-mode): * lisp/startup.el (normal-top-level, normal-splash-screen): * lisp/strokes.el (strokes-list-strokes): * lisp/thumbs.el (thumbs-insert-image, thumbs-show-thumbs-list): * lisp/tree-widget.el (tree-widget-set-theme): * lisp/window.el (read-buffer-to-switch): * lisp/xwidget.el (xwidget-webkit-begin-edit-textarea): Prefer setq-local.
142 lines
5.1 KiB
EmacsLisp
142 lines
5.1 KiB
EmacsLisp
;;; scroll-lock.el --- Scroll lock scrolling. -*- lexical-binding:t -*-
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;; Copyright (C) 2005-2020 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 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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(make-variable-buffer-local 'scroll-lock-preserve-screen-pos-save)
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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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