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|
;;; scroll-all.el --- scroll all buffers together minor mode
;; Copyright (C) 1997 Free Software Foundation, Inc.
;; Author: Gary D. Foster <[email protected]>
;; 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.
;; You can enable and disable this mode with the 'scroll-all-mode' command.
;; Suggestions/ideas from:
;; Rick Macdonald <[email protected]>
;; Anders Lindgren <[email protected]>
;;; Code:
(defvar running-xemacs (string-match "XEmacs\\|Lucid" emacs-version))
;;;###autoload
(defcustom scroll-all-mode nil
"Control/track scroll locking.
Setting this variable directly does not take effect;
use either \\[customize] or the function `scroll-all-mode'."
:set (lambda (symbol value) (scroll-all-mode (if value 1 0)))
:initialize 'custom-initialize-default
:require 'scroll-all
:type 'boolean
:group 'windows)
(if running-xemacs
(add-minor-mode 'scroll-all-mode " *SL*")
(or (assq 'scroll-all-mode minor-mode-alist)
(setq minor-mode-alist
(cons '(scroll-all-mode " *SL*") minor-mode-alist))))
(defun scroll-all-function-all (func arg)
"Apply function FUNC with argument ARG to all visible windows."
(let ((num-windows (count-windows))
(count 1))
(when (> num-windows 1)
(other-window 1)
(while (< count num-windows)
(condition-case nil
(funcall func arg)
;; Ignore beginning- or end-of-buffer error in other windows.
(error nil)
)
(other-window 1)
(setq count (1+ count))))))
(defun scroll-all-scroll-down-all (arg)
"Scroll down in all visible windows."
(interactive "p")
(scroll-all-function-all 'next-line arg))
(defun scroll-all-scroll-up-all (arg)
"Scroll up in all visible windows."
(interactive "p")
(scroll-all-function-all 'previous-line arg))
(defun scroll-all-page-down-all (arg)
"Page down in all visible windows."
(interactive "P")
(scroll-all-function-all 'scroll-up arg))
(defun scroll-all-page-up-all (arg)
"Page up in all visible windows."
(interactive "P")
(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."
(interactive "P")
(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."
(interactive "P")
(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)
(call-interactively 'scroll-all-scroll-down-all))
((eq this-command 'previous-line)
(call-interactively 'scroll-all-scroll-up-all))
((eq this-command 'scroll-up)
(call-interactively 'scroll-all-page-down-all))
((eq this-command 'scroll-down)
(call-interactively 'scroll-all-page-up-all))
((eq this-command 'beginning-of-buffer)
(call-interactively 'scroll-all-beginning-of-buffer-all))
((eq this-command 'end-of-buffer)
(call-interactively 'scroll-all-end-of-buffer-all))))
;;;###autoload
(defun scroll-all-mode (arg)
"Toggle Scroll-All minor mode."
(interactive "P")
(setq scroll-all-mode (not scroll-all-mode))
(cond
((eq scroll-all-mode 't)
(add-hook 'post-command-hook 'scroll-all-check-to-scroll))
((eq scroll-all-mode 'nil)
(remove-hook 'post-command-hook 'scroll-all-check-to-scroll))))
(provide 'scroll-all)
;;; scroll-all.el ends here
|
