1 ;;; scroll-all.el --- scroll all buffers together minor mode
3 ;; Copyright (C) 1997 Free Software Foundation, Inc.
5 ;; Author: Gary D. Foster <Gary.Foster@corp.sun.com>
6 ;; Keywords: scroll crisp brief lock
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
26 ;; This mode allows multiple buffers to be 'locked' so that scrolling
27 ;; up or down lines in any buffer causes all the buffers to mirror
28 ;; the scrolling. It hooks into the post-command-hook to check for
29 ;; potential scrolling commands and if we're locked, mirrors them in all
30 ;; windows. This allows us to grab line-at-a-time scrolling as well as
31 ;; screen-at-a-time scrolling, and doesn't remap any of the keyboard
34 ;; You can enable and disable this mode with the 'scroll-all-mode' command.
36 ;; Suggestions/ideas from:
37 ;; Rick Macdonald <rickm@vsl.com>
38 ;; Anders Lindgren <andersl@csd.uu.se>
42 (defvar running-xemacs
(string-match "XEmacs\\|Lucid" emacs-version
))
45 (defcustom scroll-all-mode nil
46 "Control/track scroll locking.
48 Setting this variable directly does not take effect;
49 use either \\[customize] or the function `scroll-all-mode'."
50 :set
(lambda (symbol value
) (scroll-all-mode (if value
1 0)))
51 :initialize
'custom-initialize-default
57 (add-minor-mode 'scroll-all-mode
" *SL*")
58 (or (assq 'scroll-all-mode minor-mode-alist
)
59 (setq minor-mode-alist
60 (cons '(scroll-all-mode " *SL*") minor-mode-alist
))))
62 (defun scroll-all-function-all (func arg
)
63 "Apply function FUNC with argument ARG to all visible windows."
64 (let ((num-windows (count-windows))
66 (when (> num-windows
1)
68 (while (< count num-windows
)
71 ;; Ignore beginning- or end-of-buffer error in other windows.
75 (setq count
(1+ count
))))))
77 (defun scroll-all-scroll-down-all (arg)
78 "Scroll down in all visible windows."
80 (scroll-all-function-all 'next-line arg
))
82 (defun scroll-all-scroll-up-all (arg)
83 "Scroll up in all visible windows."
85 (scroll-all-function-all 'previous-line arg
))
87 (defun scroll-all-page-down-all (arg)
88 "Page down in all visible windows."
90 (scroll-all-function-all 'scroll-up arg
))
92 (defun scroll-all-page-up-all (arg)
93 "Page up in all visible windows."
95 (scroll-all-function-all 'scroll-down arg
))
97 (defun scroll-all-beginning-of-buffer-all (arg)
98 "Go to the beginning of the buffer in all visible windows."
100 (scroll-all-function-all 'beginning-of-buffer arg
))
102 (defun scroll-all-end-of-buffer-all (arg)
103 "Go to the end of the buffer in all visible windows."
105 (scroll-all-function-all 'end-of-buffer arg
))
108 (defun scroll-all-check-to-scroll ()
109 "Check `this-command' to see if a scroll is to be done."
110 (cond ((eq this-command
'next-line
)
111 (call-interactively 'scroll-all-scroll-down-all
))
112 ((eq this-command
'previous-line
)
113 (call-interactively 'scroll-all-scroll-up-all
))
114 ((eq this-command
'scroll-up
)
115 (call-interactively 'scroll-all-page-down-all
))
116 ((eq this-command
'scroll-down
)
117 (call-interactively 'scroll-all-page-up-all
))
118 ((eq this-command
'beginning-of-buffer
)
119 (call-interactively 'scroll-all-beginning-of-buffer-all
))
120 ((eq this-command
'end-of-buffer
)
121 (call-interactively 'scroll-all-end-of-buffer-all
))))
125 (defun scroll-all-mode (arg)
126 "Toggle Scroll-All minor mode."
128 (setq scroll-all-mode
(not scroll-all-mode
))
130 ((eq scroll-all-mode
't
)
131 (add-hook 'post-command-hook
'scroll-all-check-to-scroll
))
132 ((eq scroll-all-mode
'nil
)
133 (remove-hook 'post-command-hook
'scroll-all-check-to-scroll
))))
135 (provide 'scroll-all
)
137 ;;; scroll-all.el ends here