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122 lines
4.4 KiB
EmacsLisp
122 lines
4.4 KiB
EmacsLisp
;;; mwheel.el --- Mouse support for MS intelli-mouse type mice
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;; Copyright (C) 1998, Free Software Foundation, Inc.
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;; Maintainer: William M. Perry <wmperry@gnu.org>
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;; Keywords: mouse
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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 code will enable the use of the infamous 'wheel' on the new
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;; crop of mice. Under XFree86 and the XSuSE X Servers, the wheel
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;; events are sent as button4/button5 events.
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;; I for one would prefer some way of converting the button4/button5
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;; events into different event types, like 'mwheel-up' or
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;; 'mwheel-down', but I cannot find a way to do this very easily (or
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;; portably), so for now I just live with it.
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;; To enable this code, simply put this at the top of your .emacs
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;; file:
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;;
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;; (mwheel-install)
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;;; Code:
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(require 'custom)
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(defcustom mwheel-scroll-amount '(5 . 1)
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"Amount to scroll windows by when spinning the mouse wheel.
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This is actually a cons cell, where the first item is the amount to scroll
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on a normal wheel event, and the second is the amount to scroll when the
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wheel is moved with the shift key depressed.
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Each item should be the number of lines to scroll, or `nil' for near
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full screen.
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A near full screen is `next-screen-context-lines' less than a full screen."
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:group 'mouse
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:type '(cons
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(choice :tag "Normal"
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(const :tag "Full screen" :value nil)
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(integer :tag "Specific # of lines"))
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(choice :tag "Shifted"
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(const :tag "Full screen" :value nil)
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(integer :tag "Specific # of lines"))))
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(defcustom mwheel-follow-mouse nil
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"Whether the mouse wheel should scroll the window that the mouse is over.
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This can be slightly disconcerting, but some people may prefer it."
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:group 'mouse
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:type 'boolean)
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(if (not (fboundp 'event-button))
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(defun mwheel-event-button (event)
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(let ((x (symbol-name (event-basic-type event))))
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(if (not (string-match "^mouse-\\([0-9]+\\)" x))
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(error "Not a button event: %S" event))
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(string-to-int (substring x (match-beginning 1) (match-end 1)))))
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(fset 'mwheel-event-button 'event-button))
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(if (not (fboundp 'event-window))
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(defun mwheel-event-window (event)
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(posn-window (event-start event)))
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(fset 'mwheel-event-window 'event-window))
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(defun mwheel-scroll (event)
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(interactive "e")
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(let ((curwin (if mwheel-follow-mouse
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(prog1
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(selected-window)
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(select-window (mwheel-event-window event)))))
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(amt (if (memq 'shift (event-modifiers event))
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(cdr mwheel-scroll-amount)
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(car mwheel-scroll-amount))))
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(unwind-protect
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(let ((button (mwheel-event-button event)))
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(cond ((= button 4) (scroll-down amt))
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((= button 5) (scroll-up amt))
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(t (error "Bad binding in mwheel-scroll"))))
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(if curwin (select-window curwin)))))
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;;;###autoload
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(defun mwheel-install ()
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"Enable mouse wheel support."
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;; In the latest versions of XEmacs, we could just use
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;; (S-)*mouse-[45], since those are aliases for the button
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;; equivalents in XEmacs, but I want this to work in as many
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;; versions of XEmacs as it can.
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(let* ((mwheel-running-xemacs (string-match "XEmacs" (emacs-version)))
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(keys (if mwheel-running-xemacs
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'(button4 [(shift button4)] button5 [(shift button5)])
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'([mouse-4] [S-mouse-4] [mouse-5] [S-mouse-5]))))
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;; This condition-case is here because Emacs 19 will throw an error
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;; if you try to define a key that it does not know about. I for one
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;; prefer to just unconditionally do a mwheel-install in my .emacs, so
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;; that if the wheeled-mouse is there, it just works, and this way it
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;; doesn't yell at me if I'm on my laptop or another machine, etc.
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(condition-case ()
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(while keys
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(define-key global-map (car keys) 'mwheel-scroll)
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(setq keys (cdr keys)))
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(error nil))))
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(provide 'mwheel)
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;;; mwheel.el ends here
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