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comparison lisp/emulators/scroll-lock.el @ 72:b9518feda344 r20-0b31

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Import from CVS: tag r20-0b31
author cvs
date Mon, 13 Aug 2007 09:03:46 +0200
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71:bae944334fa4 72:b9518feda344
1 ;; @(#) scroll-lock.el -- scroll-locking minor mode
2
3 ;; Authors:
4 ;; Gary D. Foster <Gary.Foster@corp.sun.com>
5 ;; with contributions/suggestions/ideas from:
6 ;; Rick Macdonald <rickm@vsl.com>
7 ;; Anders Lindgren <andersl@csd.uu.se>
8 ;; $Revision: 1.1.1.1 $
9 ;; Keywords: scroll crisp brief lock
10
11 ;; This file is part of GNU Emacs.
12
13 ;; GNU Emacs is free software; you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; any later version.
17
18 ;; GNU Emacs is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
22
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with GNU Emacs; see the file COPYING. If not, write to the
25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
26 ;; Boston, MA 02111-1307, USA.
27
28 ;; Commentary
29 ;; This mode allows multiple buffers to be 'locked' so that scrolling
30 ;; up or down lines in any buffer causes all the buffers to mirror
31 ;; the scrolling. It hooks into the post-command-hook to check for
32 ;; potential scrolling commands and if we're locked, mirrors them in all
33 ;; windows. This allows us to grab line-at-a-time scrolling as well as
34 ;; screen-at-a-time scrolling, and doesn't remap any of the keyboard
35 ;; commands to do it.
36
37 ;; This minor mode is normally autoloaded from the scroll-lock package.
38 ;; You can disable autoloading of this package by placing
39 ;; (setq crisp-load-scroll-lock nil) in your .emacs before loading
40 ;; the crisp package. If you want to use this package by itself,
41 ;; you can enable it by placing the following in your .emacs:
42
43 ;; (require 'scroll-lock)
44
45 ;; In the first (autoloaded) case, meta-f1 is bound to the command to
46 ;; toggle the scroll-lock mode. In the second (non-autoloaded) case,
47 ;; you can enable and disable it with the 'scroll-lock-mode' command.
48
49 (defvar scroll-lock-running-xemacs (string-match "XEmacs\\|Lucid" emacs-version))
50
51 (defvar scroll-lock-modeline-string " *SL*"
52 "String to display in the modeline when Scroll Lock mode is enabled.")
53
54 (defvar scroll-lock-is-locked nil
55 "Track status of scroll locking.")
56 (if scroll-lock-running-xemacs
57 (add-minor-mode 'scroll-lock-is-locked scroll-lock-modeline-string)
58 (or (assq 'scroll-lock-is-locked minor-mode-alist)
59 (setq minor-mode-alist
60 (cons '(scroll-lock-is-locked scroll-lock-modeline-string) minor-mode-alist))))
61
62 (defun scroll-lock-scroll-down-all (arg)
63 "Scroll-down 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-max)))
71 (progn (call-interactively 'next-line)))
72 (other-window 1)
73 (setq count (1+ count)))))))
74
75 (defun scroll-lock-scroll-up-all (arg)
76 "Scroll-up 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 (if (not (eq (point) (point-min)))
84 (progn (call-interactively 'previous-line)))
85 (other-window 1)
86 (setq count (1+ count)))))))
87
88 (defun scroll-lock-page-down-all (arg)
89 "Page-down all visible windows."
90 (interactive "P")
91 (let ((num-windows (count-windows))
92 (count 1))
93 (if (> num-windows 1)
94 (progn (other-window 1)
95 (while (< count num-windows)
96 (call-interactively 'fkey-scroll-up)
97 (other-window 1)
98 (setq count (1+ count)))))))
99
100 (defun scroll-lock-page-up-all (arg)
101 "Page-up all visible windows."
102 (interactive "P")
103 (let ((num-windows (count-windows))
104 (count 1))
105 (if (> num-windows 1)
106 (progn (other-window 1)
107 (while (< count num-windows)
108 (call-interactively 'fkey-scroll-down)
109 (other-window 1)
110 (setq count (1+ count)))))))
111
112
113 (defun scroll-lock-check-to-scroll ()
114 "Check last-command to see if a scroll was done."
115 (if (eq this-command 'next-line)
116 (call-interactively 'scroll-lock-scroll-down-all))
117 (if (eq this-command 'previous-line)
118 (call-interactively 'scroll-lock-scroll-up-all))
119 (if (eq this-command 'fkey-scroll-up)
120 (call-interactively 'scroll-lock-page-down-all))
121 (if (eq this-command 'fkey-scroll-down)
122 (call-interactively 'scroll-lock-page-up-all)))
123
124
125 (defun scroll-lock-mode (arg)
126 "Toggle scroll-lock minor mode."
127 (interactive "P")
128 (setq scroll-lock-is-locked (not scroll-lock-is-locked))
129 (cond
130 ((eq scroll-lock-is-locked 't)
131 (add-hook 'post-command-hook 'scroll-lock-check-to-scroll))
132 ((eq scroll-lock-is-locked 'nil)
133 (remove-hook 'post-command-hook 'scroll-lock-check-to-scroll))))
134
135 (provide 'scroll-lock)
136
137 ;;; scroll-lock.el ends here