mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-18 10:16:51 +00:00
122 lines
4.4 KiB
EmacsLisp
122 lines
4.4 KiB
EmacsLisp
;;; mwheel.el --- Mouse support for MS intelli-mouse type mice
|
|
|
|
;; Copyright (C) 1998, Free Software Foundation, Inc.
|
|
;; Maintainer: William M. Perry <wmperry@gnu.org>
|
|
;; Keywords: mouse
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation; either version 2, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs; see the file COPYING. If not, write to the
|
|
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; This code will enable the use of the infamous 'wheel' on the new
|
|
;; crop of mice. Under XFree86 and the XSuSE X Servers, the wheel
|
|
;; events are sent as button4/button5 events.
|
|
|
|
;; I for one would prefer some way of converting the button4/button5
|
|
;; events into different event types, like 'mwheel-up' or
|
|
;; 'mwheel-down', but I cannot find a way to do this very easily (or
|
|
;; portably), so for now I just live with it.
|
|
|
|
;; To enable this code, simply put this at the top of your .emacs
|
|
;; file:
|
|
;;
|
|
;; (mwheel-install)
|
|
|
|
;;; Code:
|
|
|
|
(require 'custom)
|
|
|
|
(defcustom mwheel-scroll-amount '(5 . 1)
|
|
"Amount to scroll windows by when spinning the mouse wheel.
|
|
This is actually a cons cell, where the first item is the amount to scroll
|
|
on a normal wheel event, and the second is the amount to scroll when the
|
|
wheel is moved with the shift key depressed.
|
|
|
|
Each item should be the number of lines to scroll, or `nil' for near
|
|
full screen.
|
|
A near full screen is `next-screen-context-lines' less than a full screen."
|
|
:group 'mouse
|
|
:type '(cons
|
|
(choice :tag "Normal"
|
|
(const :tag "Full screen" :value nil)
|
|
(integer :tag "Specific # of lines"))
|
|
(choice :tag "Shifted"
|
|
(const :tag "Full screen" :value nil)
|
|
(integer :tag "Specific # of lines"))))
|
|
|
|
(defcustom mwheel-follow-mouse nil
|
|
"Whether the mouse wheel should scroll the window that the mouse is over.
|
|
This can be slightly disconcerting, but some people may prefer it."
|
|
:group 'mouse
|
|
:type 'boolean)
|
|
|
|
(if (not (fboundp 'event-button))
|
|
(defun mwheel-event-button (event)
|
|
(let ((x (symbol-name (event-basic-type event))))
|
|
(if (not (string-match "^mouse-\\([0-9]+\\)" x))
|
|
(error "Not a button event: %S" event))
|
|
(string-to-int (substring x (match-beginning 1) (match-end 1)))))
|
|
(fset 'mwheel-event-button 'event-button))
|
|
|
|
(if (not (fboundp 'event-window))
|
|
(defun mwheel-event-window (event)
|
|
(posn-window (event-start event)))
|
|
(fset 'mwheel-event-window 'event-window))
|
|
|
|
(defun mwheel-scroll (event)
|
|
(interactive "e")
|
|
(let ((curwin (if mwheel-follow-mouse
|
|
(prog1
|
|
(selected-window)
|
|
(select-window (mwheel-event-window event)))))
|
|
(amt (if (memq 'shift (event-modifiers event))
|
|
(cdr mwheel-scroll-amount)
|
|
(car mwheel-scroll-amount))))
|
|
(unwind-protect
|
|
(let ((button (mwheel-event-button event)))
|
|
(cond ((= button 4) (scroll-down amt))
|
|
((= button 5) (scroll-up amt))
|
|
(t (error "Bad binding in mwheel-scroll"))))
|
|
(if curwin (select-window curwin)))))
|
|
|
|
;;;###autoload
|
|
(defun mwheel-install ()
|
|
"Enable mouse wheel support."
|
|
;; In the latest versions of XEmacs, we could just use
|
|
;; (S-)*mouse-[45], since those are aliases for the button
|
|
;; equivalents in XEmacs, but I want this to work in as many
|
|
;; versions of XEmacs as it can.
|
|
(let* ((mwheel-running-xemacs (string-match "XEmacs" (emacs-version)))
|
|
(keys (if mwheel-running-xemacs
|
|
'(button4 [(shift button4)] button5 [(shift button5)])
|
|
'([mouse-4] [S-mouse-4] [mouse-5] [S-mouse-5]))))
|
|
;; This condition-case is here because Emacs 19 will throw an error
|
|
;; if you try to define a key that it does not know about. I for one
|
|
;; prefer to just unconditionally do a mwheel-install in my .emacs, so
|
|
;; that if the wheeled-mouse is there, it just works, and this way it
|
|
;; doesn't yell at me if I'm on my laptop or another machine, etc.
|
|
(condition-case ()
|
|
(while keys
|
|
(define-key global-map (car keys) 'mwheel-scroll)
|
|
(setq keys (cdr keys)))
|
|
(error nil))))
|
|
|
|
(provide 'mwheel)
|
|
|
|
;;; mwheel.el ends here
|