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[emacs.git] / lisp / scroll-all.el
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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)
13 ;; any later version.
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.
25 ;; Commentary
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
32 ;; commands to do it.
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>
40 (defvar running-xemacs (string-match "XEmacs\\|Lucid" emacs-version))
41 (defvar scroll-all-mode nil
42 "Track status of scroll locking.")
43 (if running-xemacs
44 (add-minor-mode 'scroll-all-mode " *SL*")
45 (or (assq 'scroll-all-mode-mode minor-mode-alist)
46 (setq minor-mode-alist
47 (cons '(scroll-all-mode-mode " *SL*") minor-mode-alist))))
49 (defun scroll-all-scroll-down-all (arg)
50 "Scroll down all visible windows."
51 (interactive "P")
52 (let ((num-windows (count-windows))
53 (count 1))
54 (if (> num-windows 1)
55 ( progn (other-window 1)
56 (while (< count num-windows)
57 (if (not (eq (point) (point-max)))
58 (progn (call-interactively 'next-line)))
59 (other-window 1)
60 (setq count (1+ count)))))))
62 (defun scroll-all-scroll-up-all (arg)
63 "Scroll up all visible windows."
64 (interactive "P")
65 (let ((num-windows (count-windows))
66 (count 1))
67 (if (> num-windows 1)
68 ( progn (other-window 1)
69 (while (< count num-windows)
70 (if (not (eq (point) (point-min)))
71 (progn (call-interactively 'previous-line)))
72 (other-window 1)
73 (setq count (1+ count)))))))
75 (defun scroll-all-page-down-all (arg)
76 "Page down in all visible windows."
77 (interactive "P")
78 (let ((num-windows (count-windows))
79 (count 1))
80 (if (> num-windows 1)
81 (progn (other-window 1)
82 (while (< count num-windows)
83 (call-interactively 'fkey-scroll-up)
84 (other-window 1)
85 (setq count (1+ count)))))))
87 (defun scroll-all-page-up-all (arg)
88 "Page up in all visible windows."
89 (interactive "P")
90 (let ((num-windows (count-windows))
91 (count 1))
92 (if (> num-windows 1)
93 (progn (other-window 1)
94 (while (< count num-windows)
95 (call-interactively 'fkey-scroll-down)
96 (other-window 1)
97 (setq count (1+ count)))))))
100 (defun scroll-all-check-to-scroll ()
101 "Check `last-command' to see if a scroll was done."
102 (if (eq this-command 'next-line)
103 (call-interactively 'scroll-all-scroll-down-all))
104 (if (eq this-command 'previous-line)
105 (call-interactively 'scroll-all-scroll-up-all))
106 (if (eq this-command 'fkey-scroll-up)
107 (call-interactively 'scroll-all-page-down-all))
108 (if (eq this-command 'fkey-scroll-down)
109 (call-interactively 'scroll-all-page-up-all)))
112 (defun scroll-all-mode (arg)
113 "Toggle Scroll-All minor mode."
114 (interactive "P")
115 (setq scroll-all-mode (not scroll-all-mode))
116 (cond
117 ((eq scroll-all-mode 't)
118 (add-hook 'post-command-hook 'scroll-all-check-to-scroll))
119 ((eq scroll-all-mode 'nil)
120 (remove-hook 'post-command-hook 'scroll-all-check-to-scroll))))
122 (provide 'scroll-all)
124 ;; scroll-all.el ends here