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;; @(#) scroll-lock.el -- scroll-locking minor mode
;; Authors:
;; Gary D. Foster <Gary.Foster@corp.sun.com>
;; with contributions/suggestions/ideas from:
;; Rick Macdonald <rickm@vsl.com>
;; Anders Lindgren <andersl@csd.uu.se>
;; $Revision: 1.4 $
;; 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;; Commentary
;; 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.
;; This minor mode is normally autoloaded from the scroll-lock package.
;; You can disable autoloading of this package by placing
;; (setq crisp-load-scroll-lock nil) in your .emacs before loading
;; the crisp package. If you want to use this package by itself,
;; you can enable it by placing the following in your .emacs:
;; (require 'scroll-lock)
;; In the first (autoloaded) case, meta-f1 is bound to the command to
;; toggle the scroll-lock mode. In the second (non-autoloaded) case,
;; you can enable and disable it with the 'scroll-lock-mode' command.
(defvar scroll-lock-running-xemacs (string-match "XEmacs\\|Lucid" emacs-version))
(defvar scroll-lock-modeline-string " *SL*"
"String to display in the modeline when Scroll Lock mode is enabled.")
(defvar scroll-lock-is-locked nil
"Track status of scroll locking.")
(if scroll-lock-running-xemacs
(add-minor-mode 'scroll-lock-is-locked scroll-lock-modeline-string)
(or (assq 'scroll-lock-is-locked minor-mode-alist)
(setq minor-mode-alist
(cons '(scroll-lock-is-locked scroll-lock-modeline-string) minor-mode-alist))))
(defun scroll-lock-scroll-down-all (arg)
"Scroll-down all visible windows."
(interactive "P")
(let ((num-windows (count-windows))
(count 1))
(if (> num-windows 1)
( progn (other-window 1)
(while (< count num-windows)
(if (not (eq (point) (point-max)))
(progn (call-interactively 'next-line)))
(other-window 1)
(setq count (1+ count)))))))
(defun scroll-lock-scroll-up-all (arg)
"Scroll-up all visible windows."
(interactive "P")
(let ((num-windows (count-windows))
(count 1))
(if (> num-windows 1)
( progn (other-window 1)
(while (< count num-windows)
(if (not (eq (point) (point-min)))
(progn (call-interactively 'previous-line)))
(other-window 1)
(setq count (1+ count)))))))
(defun scroll-lock-page-down-all (arg)
"Page-down all visible windows."
(interactive "P")
(let ((num-windows (count-windows))
(count 1))
(if (> num-windows 1)
(progn (other-window 1)
(while (< count num-windows)
(call-interactively 'fkey-scroll-up)
(other-window 1)
(setq count (1+ count)))))))
(defun scroll-lock-page-up-all (arg)
"Page-up all visible windows."
(interactive "P")
(let ((num-windows (count-windows))
(count 1))
(if (> num-windows 1)
(progn (other-window 1)
(while (< count num-windows)
(call-interactively 'fkey-scroll-down)
(other-window 1)
(setq count (1+ count)))))))
(defun scroll-lock-check-to-scroll ()
"Check last-command to see if a scroll was done."
(if (eq this-command 'next-line)
(call-interactively 'scroll-lock-scroll-down-all))
(if (eq this-command 'previous-line)
(call-interactively 'scroll-lock-scroll-up-all))
(if (eq this-command 'fkey-scroll-up)
(call-interactively 'scroll-lock-page-down-all))
(if (eq this-command 'fkey-scroll-down)
(call-interactively 'scroll-lock-page-up-all)))
(defun scroll-lock-mode (arg)
"Toggle scroll-lock minor mode."
(interactive "P")
(setq scroll-lock-is-locked (not scroll-lock-is-locked))
(cond
((eq scroll-lock-is-locked 't)
(add-hook 'post-command-hook 'scroll-lock-check-to-scroll))
((eq scroll-lock-is-locked 'nil)
(remove-hook 'post-command-hook 'scroll-lock-check-to-scroll))))
(provide 'scroll-lock)
;;; scroll-lock.el ends here
|
