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1 ;;; mwheel.el --- Mouse support for MS intelli-mouse type mice
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2
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3 ;; Copyright (C) 1998, Free Software Foundation, Inc.
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4 ;; Maintainer: William M. Perry <wmperry@cs.indiana.edu>
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5 ;; Keywords: mouse
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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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,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Synched up with: Not synched.
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25
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26 ;;; Commentary:
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27
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28 ;; This code will enable the use of the infamous 'wheel' on the new
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29 ;; crop of mice. Under XFree86 and the XSuSE X Servers, the wheel
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30 ;; events are sent as button4/button5 events.
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31
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32 ;; I for one would prefer some way of converting the button4/button5
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33 ;; events into different event types, like 'mwheel-up' or
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34 ;; 'mwheel-down', but I cannot find a way to do this very easily (or
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35 ;; portably), so for now I just live with it.
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36
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37 ;; To enable this code, simply put this at the top of your .emacs
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38 ;; file:
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39 ;;
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40 ;; (autoload 'mwheel-install "mwheel" "Enable mouse wheel support.")
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41 ;; (mwheel-install)
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42
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43 ;;; Code:
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44
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45 (require 'custom)
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46 (require 'cl)
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47
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48 (defcustom mwheel-scroll-amount '(5 . 1)
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49 "Amount to scroll windows by when spinning the mouse wheel.
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50 This is actually a cons cell, where the first item is the amount to scroll
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51 on a normal wheel event, and the second is the amount to scroll when the
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52 wheel is moved with the shift key depressed.
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53
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54 Each item should be the number of lines to scroll, or `nil' for near
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55 full screen.
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56 A near full screen is `next-screen-context-lines' less than a full screen."
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57 :group 'mouse
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58 :type '(cons
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59 (choice :tag "Normal"
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60 (const :tag "Full screen" :value nil)
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61 (integer :tag "Specific # of lines"))
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62 (choice :tag "Shifted"
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63 (const :tag "Full screen" :value nil)
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64 (integer :tag "Specific # of lines"))))
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65
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66 (defcustom mwheel-follow-mouse nil
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67 "Whether the mouse wheel should scroll the window that the mouse is over.
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68 This can be slightly disconcerting, but some people may prefer it."
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69 :group 'mouse
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70 :type 'boolean)
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71
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72 (if (not (fboundp 'event-button))
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73 (defun mwheel-event-button (event)
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74 (let ((x (symbol-name (event-basic-type event))))
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75 (if (not (string-match "^mouse-\\([0-9]+\\)" x))
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76 (error "Not a button event: %S" event))
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77 (string-to-int (substring x (match-beginning 1) (match-end 1)))))
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78 (fset 'mwheel-event-button 'event-button))
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79
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80 (if (not (fboundp 'event-window))
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81 (defun mwheel-event-window (event)
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82 (posn-window (event-start event)))
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83 (fset 'mwheel-event-window 'event-window))
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84
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85 (defun mwheel-scroll (event)
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86 (interactive "e")
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87 (let ((curwin (if mwheel-follow-mouse
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88 (prog1
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89 (selected-window)
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90 (select-window (mwheel-event-window event)))))
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91 (amt (if (memq 'shift (event-modifiers event))
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92 (cdr mwheel-scroll-amount)
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93 (car mwheel-scroll-amount))))
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94 (case (mwheel-event-button event)
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95 (4 (scroll-down amt))
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96 (5 (scroll-up amt))
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97 (otherwise (error "Bad binding in mwheel-scroll")))
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98 (if curwin (select-window curwin))))
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99
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100 ;;;###autoload
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101 (defun mwheel-install ()
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102 "Enable mouse wheel support."
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265
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103 (let ((keys '([(mouse-4)] [(shift mouse-4)] [(mouse-5)] [(shift mouse-5)])))
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263
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104 ;; This condition-case is here because Emacs 19 will throw an error
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105 ;; if you try to define a key that it does not know about. I for one
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106 ;; prefer to just unconditionally do a mwheel-install in my .emacs, so
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107 ;; that if the wheeled-mouse is there, it just works, and this way it
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108 ;; doesn't yell at me if I'm on my laptop or another machine, etc.
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109 (condition-case ()
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110 (while keys
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111 (define-key global-map (car keys) 'mwheel-scroll)
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112 (setq keys (cdr keys)))
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113 (error nil))))
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114
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115 (provide 'mwheel)
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116
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117 ;;; mwheel.el ends here
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