;;; scroll-all.el --- scroll all buffers together minor mode
;; Copyright (C) 1997, 2002, 2003, 2004, 2005,
;; 2006 Free Software Foundation, Inc.
;; Author: Gary D. Foster <Gary.Foster@corp.sun.com>
;; Keywords: scroll crisp brief lock
;; 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 2, 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; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;; This mode allows multiple buffers to be 'locked' so that scrolling
;; up or down lines in any buffer causes all the buffers to mirror
;; the scrolling. It hooks into the post-command-hook to check for
;; potential scrolling commands and if we're locked, mirrors them in all
;; windows. This allows us to grab line-at-a-time scrolling as well as
;; screen-at-a-time scrolling, and doesn't remap any of the keyboard
;; commands to do it.
;; You can enable and disable this mode with the 'scroll-all-mode' command.
;; Suggestions/ideas from:
;; Rick Macdonald <email@example.com>
;; Anders Lindgren <firstname.lastname@example.org>
(defun scroll-all-function-all (func arg)
"Apply function FUNC with argument ARG to all visible windows."
(let ((num-windows (count-windows))
(when (> num-windows 1)
(while (< count num-windows)
(funcall func arg)
;; Ignore beginning- or end-of-buffer error in other windows.
(setq count (1+ count))))))
(defun scroll-all-scroll-down-all (arg)
"Scroll down in all visible windows."
(scroll-all-function-all 'next-line arg))
(defun scroll-all-scroll-up-all (arg)
"Scroll up in all visible windows."
(scroll-all-function-all 'previous-line arg))
(defun scroll-all-page-down-all (arg)
"Page down in all visible windows."
(scroll-all-function-all 'scroll-up arg))
(defun scroll-all-page-up-all (arg)
"Page up in all visible windows."
(scroll-all-function-all 'scroll-down arg))
(defun scroll-all-beginning-of-buffer-all (arg)
"Go to the beginning of the buffer in all visible windows."
(scroll-all-function-all 'beginning-of-buffer arg))
(defun scroll-all-end-of-buffer-all (arg)
"Go to the end of the buffer in all visible windows."
(scroll-all-function-all 'end-of-buffer arg))
(defun scroll-all-check-to-scroll ()
"Check `this-command' to see if a scroll is to be done."
(cond ((eq this-command 'next-line)
((eq this-command 'previous-line)
((eq this-command 'scroll-up)
((eq this-command 'scroll-down)
((eq this-command 'beginning-of-buffer)
((eq this-command 'end-of-buffer)
"Toggle Scroll-All minor mode.
With ARG, turn Scroll-All minor mode on if ARG is positive, off otherwise.
When Scroll-All mode is on, scrolling commands entered in one window
apply to all visible windows in the same frame."
nil " *SL*" nil
(add-hook 'post-command-hook 'scroll-all-check-to-scroll)
(remove-hook 'post-command-hook 'scroll-all-check-to-scroll)))
;;; arch-tag: db20089a-b157-45df-b5d4-2430e60acdd8
;;; scroll-all.el ends here