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138 lines
4.4 KiB
EmacsLisp
138 lines
4.4 KiB
EmacsLisp
;;; scroll-all.el --- scroll all buffers together minor mode
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;; Copyright (C) 1997 Free Software Foundation, Inc.
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;; Author: Gary D. Foster <Gary.Foster@corp.sun.com>
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;; Keywords: scroll crisp brief lock
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This mode allows multiple buffers to be 'locked' so that scrolling
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;; up or down lines in any buffer causes all the buffers to mirror
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;; the scrolling. It hooks into the post-command-hook to check for
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;; potential scrolling commands and if we're locked, mirrors them in all
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;; windows. This allows us to grab line-at-a-time scrolling as well as
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;; screen-at-a-time scrolling, and doesn't remap any of the keyboard
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;; commands to do it.
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;; You can enable and disable this mode with the 'scroll-all-mode' command.
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;; Suggestions/ideas from:
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;; Rick Macdonald <rickm@vsl.com>
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;; Anders Lindgren <andersl@csd.uu.se>
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;;; Code:
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(defvar running-xemacs (string-match "XEmacs\\|Lucid" emacs-version))
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;;;###autoload
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(defcustom scroll-all-mode nil
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"Control/track scroll locking.
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Setting this variable directly does not take effect;
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use either M-x customize or the function `scroll-all-mode'."
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:set (lambda (symbol value) (scroll-all-mode (if value 1 0)))
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:initialize 'custom-initialize-default
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:require 'scroll-all
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:type 'boolean
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:group 'windows)
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(if running-xemacs
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(add-minor-mode 'scroll-all-mode " *SL*")
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(or (assq 'scroll-all-mode-mode minor-mode-alist)
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(setq minor-mode-alist
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(cons '(scroll-all-mode-mode " *SL*") minor-mode-alist))))
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(defun scroll-all-scroll-down-all (arg)
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"Scroll down all visible windows."
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(interactive "P")
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(let ((num-windows (count-windows))
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(count 1))
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(if (> num-windows 1)
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( progn (other-window 1)
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(while (< count num-windows)
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(if (not (eq (point) (point-max)))
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(progn (call-interactively 'next-line)))
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(other-window 1)
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(setq count (1+ count)))))))
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(defun scroll-all-scroll-up-all (arg)
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"Scroll up all visible windows."
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(interactive "P")
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(let ((num-windows (count-windows))
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(count 1))
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(if (> num-windows 1)
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( progn (other-window 1)
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(while (< count num-windows)
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(if (not (eq (point) (point-min)))
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(progn (call-interactively 'previous-line)))
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(other-window 1)
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(setq count (1+ count)))))))
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(defun scroll-all-page-down-all (arg)
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"Page down in all visible windows."
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(interactive "P")
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(let ((num-windows (count-windows))
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(count 1))
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(if (> num-windows 1)
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(progn (other-window 1)
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(while (< count num-windows)
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(call-interactively 'fkey-scroll-up)
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(other-window 1)
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(setq count (1+ count)))))))
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(defun scroll-all-page-up-all (arg)
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"Page up in all visible windows."
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(interactive "P")
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(let ((num-windows (count-windows))
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(count 1))
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(if (> num-windows 1)
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(progn (other-window 1)
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(while (< count num-windows)
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(call-interactively 'fkey-scroll-down)
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(other-window 1)
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(setq count (1+ count)))))))
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(defun scroll-all-check-to-scroll ()
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"Check `last-command' to see if a scroll was done."
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(if (eq this-command 'next-line)
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(call-interactively 'scroll-all-scroll-down-all))
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(if (eq this-command 'previous-line)
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(call-interactively 'scroll-all-scroll-up-all))
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(if (eq this-command 'fkey-scroll-up)
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(call-interactively 'scroll-all-page-down-all))
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(if (eq this-command 'fkey-scroll-down)
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(call-interactively 'scroll-all-page-up-all)))
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;;;###autoload
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(defun scroll-all-mode (arg)
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"Toggle Scroll-All minor mode."
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(interactive "P")
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(setq scroll-all-mode (not scroll-all-mode))
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(cond
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((eq scroll-all-mode 't)
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(add-hook 'post-command-hook 'scroll-all-check-to-scroll))
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((eq scroll-all-mode 'nil)
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(remove-hook 'post-command-hook 'scroll-all-check-to-scroll))))
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(provide 'scroll-all)
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;;; scroll-all.el ends here
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