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