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+ − 1 ;;; mwheel.el --- Mouse support for MS intelli-mouse type mice
+ − 2
+ − 3 ;; Copyright (C) 1998, Free Software Foundation, Inc.
+ − 4 ;; Maintainer: William M. Perry <wmperry@cs.indiana.edu>
+ − 5 ;; Keywords: mouse
+ − 6
+ − 7 ;; This file is part of XEmacs.
+ − 8
+ − 9 ;; XEmacs is free software; you can redistribute it and/or modify it
+ − 10 ;; under the terms of the GNU General Public License as published by
+ − 11 ;; the Free Software Foundation; either version 2, or (at your option)
+ − 12 ;; any later version.
+ − 13
+ − 14 ;; XEmacs is distributed in the hope that it will be useful, but
+ − 15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
+ − 16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ − 17 ;; General Public License for more details.
+ − 18
+ − 19 ;; You should have received a copy of the GNU General Public License
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+ − 20 ;; along with XEmacs; see the file COPYING. If not, write to the
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+ − 21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ − 22 ;; Boston, MA 02111-1307, USA.
+ − 23
+ − 24 ;;; Synched up with: Not synched.
+ − 25
+ − 26 ;;; Commentary:
+ − 27
+ − 28 ;; This code will enable the use of the infamous 'wheel' on the new
+ − 29 ;; crop of mice. Under XFree86 and the XSuSE X Servers, the wheel
+ − 30 ;; events are sent as button4/button5 events.
+ − 31
+ − 32 ;; I for one would prefer some way of converting the button4/button5
+ − 33 ;; events into different event types, like 'mwheel-up' or
+ − 34 ;; 'mwheel-down', but I cannot find a way to do this very easily (or
+ − 35 ;; portably), so for now I just live with it.
+ − 36
+ − 37 ;; To enable this code, simply put this at the top of your .emacs
+ − 38 ;; file:
+ − 39 ;;
+ − 40 ;; (autoload 'mwheel-install "mwheel" "Enable mouse wheel support.")
+ − 41 ;; (mwheel-install)
+ − 42
+ − 43 ;;; Code:
+ − 44
+ − 45 (require 'custom)
+ − 46 (require 'cl)
+ − 47
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+ − 48 (globally-declare-fboundp
+ − 49 '(event-basic-type
+ − 50 posn-window event-start mwheel-event-window mwheel-event-button))
+ − 51
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+ − 52 (defcustom mwheel-scroll-amount '(5 1 nil)
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+ − 53 "Amount to scroll windows by when spinning the mouse wheel.
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+ − 54 A list with 3 elements specifying the amount to scroll on: a normal wheel
+ − 55 event, a wheel event with the shift key pressed, and a wheel event with the
+ − 56 control key pressed, in that order.
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+ − 57
+ − 58 Each item should be the number of lines to scroll, or `nil' for near
+ − 59 full screen.
+ − 60 A near full screen is `next-screen-context-lines' less than a full screen."
+ − 61 :group 'mouse
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+ − 62 :type '(list
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+ − 63 (choice :tag "Normal"
+ − 64 (const :tag "Full screen" :value nil)
+ − 65 (integer :tag "Specific # of lines"))
+ − 66 (choice :tag "Shifted"
+ − 67 (const :tag "Full screen" :value nil)
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+ − 68 (integer :tag "Specific # of lines"))
+ − 69 (choice :tag "Controlled"
+ − 70 (const :tag "Full screen" :value nil)
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+ − 71 (integer :tag "Specific # of lines"))))
+ − 72
+ − 73 (defcustom mwheel-follow-mouse nil
+ − 74 "Whether the mouse wheel should scroll the window that the mouse is over.
+ − 75 This can be slightly disconcerting, but some people may prefer it."
+ − 76 :group 'mouse
+ − 77 :type 'boolean)
+ − 78
+ − 79 (if (not (fboundp 'event-button))
+ − 80 (defun mwheel-event-button (event)
+ − 81 (let ((x (symbol-name (event-basic-type event))))
+ − 82 (if (not (string-match "^mouse-\\([0-9]+\\)" x))
+ − 83 (error "Not a button event: %S" event))
+ − 84 (string-to-int (substring x (match-beginning 1) (match-end 1)))))
+ − 85 (fset 'mwheel-event-button 'event-button))
+ − 86
+ − 87 (if (not (fboundp 'event-window))
+ − 88 (defun mwheel-event-window (event)
+ − 89 (posn-window (event-start event)))
+ − 90 (fset 'mwheel-event-window 'event-window))
+ − 91
+ − 92 (defun mwheel-scroll (event)
+ − 93 (interactive "e")
+ − 94 (let ((curwin (if mwheel-follow-mouse
+ − 95 (prog1
+ − 96 (selected-window)
+ − 97 (select-window (mwheel-event-window event)))))
+ − 98 (amt (if (memq 'shift (event-modifiers event))
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+ − 99 (cadr mwheel-scroll-amount)
+ − 100 (if (memq 'control (event-modifiers event))
+ − 101 (caddr mwheel-scroll-amount)
+ − 102 (car mwheel-scroll-amount)))))
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+ − 103 (unwind-protect
+ − 104 (case (mwheel-event-button event)
+ − 105 (4 (scroll-down amt))
+ − 106 (5 (scroll-up amt))
+ − 107 (otherwise (error "Bad binding in mwheel-scroll")))
+ − 108 (if curwin (select-window curwin)))
+ − 109 ))
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+ − 110
+ − 111 ;;;###autoload
+ − 112 (defun mwheel-install ()
+ − 113 "Enable mouse wheel support."
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+ − 114 (interactive)
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+ − 115 (let ((keys '([(mouse-4)] [(shift mouse-4)] [(control mouse-4)]
+ − 116 [(mouse-5)] [(shift mouse-5)] [(control mouse-5)])))
+ − 117
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+ − 118 ;; This condition-case is here because Emacs 19 will throw an error
+ − 119 ;; if you try to define a key that it does not know about. I for one
+ − 120 ;; prefer to just unconditionally do a mwheel-install in my .emacs, so
+ − 121 ;; that if the wheeled-mouse is there, it just works, and this way it
+ − 122 ;; doesn't yell at me if I'm on my laptop or another machine, etc.
+ − 123 (condition-case ()
+ − 124 (while keys
+ − 125 (define-key global-map (car keys) 'mwheel-scroll)
+ − 126 (setq keys (cdr keys)))
+ − 127 (error nil))))
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+ − 128
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+ − 129 (provide 'mwheel)
+ − 130
+ − 131 ;;; mwheel.el ends here
