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1 ;;; avoid.el --- make mouse pointer stay out of the way of editing.
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2
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3 ;;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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4
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5 ;; Author: Boris Goldowsky <boris@cs.rochester.edu>
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6 ;; Keywords: mouse
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7 ;; Version: 1.10
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Synched up with: FSF 19.28.
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26
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27 ;;; Commentary:
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28 ;;;
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29 ;;; For those who are annoyed by the mouse pointer obscuring text,
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30 ;;; this mode moves the mouse pointer - either just a little out of
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31 ;;; the way, or all the way to the corner of the frame.
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32 ;;; To use, load or evaluate this file and type M-x mouse-avoidance-mode .
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33 ;;; To set up permanently, put this file on your load-path and put the
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34 ;;; following in your .emacs:
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35 ;;;
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36 ;;; (cond (window-system
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37 ;;; (require 'avoid)
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38 ;;; (mouse-avoidance-mode 'animate)))
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39 ;;;
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40 ;;; The 'animate can be 'jump or 'banish or 'exile or 'protean if you prefer.
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41 ;;; See the documentation for function `mouse-avoidance-mode' for
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42 ;;; details of the different modes.
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43 ;;;
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44 ;;; For added silliness, make the animatee animate...
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45 ;;; put something similar to the following into your .emacs:
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46 ;;;
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47 ;;; (cond (window-system
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48 ;;; (setq x-pointer-shape
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49 ;;; (eval (nth (random 4)
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50 ;;; '(x-pointer-man x-pointer-spider
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51 ;;; x-pointer-gobbler x-pointer-gumby))))
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52 ;;; (set-mouse-color (cdr (assoc 'mouse-color (frame-parameters))))))
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53 ;;;
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54 ;;; For completely random pointer shape, replace the setq above with:
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55 ;;; (setq x-pointer-shape (mouse-avoidance-random-shape))
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56 ;;;
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57 ;;; Bugs / Warnings / To-Do:
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58 ;;;
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59 ;;; - Using this code does slow emacs down. "banish" mode shouldn't
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60 ;;; ever be too bad though, and on my workstation even "animate" doesn't
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61 ;;; seem to have a noticable effect during editing.
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62 ;;;
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63 ;;; - It should find out where any overlapping frames are and avoid them,
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64 ;;; rather than always raising the frame.
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65
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66 ;;; Credits:
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67 ;;; This code was helped by all those who contributed suggestions,
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68 ;;; fixes, and additions
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69 ;;; Joe Harrington (and his advisor), for the original inspiration.
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70 ;;; Ken Manheimer, for dreaming up the Protean mode.
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71 ;;; Richard Stallman, for the awful cat-and-mouse pun, among other things.
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72 ;;; Mike Williams, Denis Howe, Bill Benedetto, Chris Moore, Don Morris,
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73 ;;; Simon Marshall, and M.S. Ashton, for their feedback.
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74 ;;;
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75 ;;; Code:
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76
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77 (provide 'avoid)
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78
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79 (defvar mouse-avoidance-mode nil
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80 "Value is t or a symbol if the mouse pointer should avoid the cursor.
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81 See function `mouse-avoidance-mode' for possible values. Changing this
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82 variable is NOT the recommended way to change modes; use that function
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83 instead.")
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84
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85 (defvar mouse-avoidance-nudge-dist 15
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86 "*Average distance that mouse will be moved when approached by cursor.
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87 Only applies in mouse-avoidance-mode `jump' and its derivatives.
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88 For best results make this larger than `mouse-avoidance-threshold'.")
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89
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90 (defvar mouse-avoidance-nudge-var 10
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91 "*Variability of `mouse-avoidance-nudge-dist' (which see).")
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92
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93 (defvar mouse-avoidance-animation-delay .01
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94 "Delay between animation steps, in seconds.")
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95
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96 (defvar mouse-avoidance-threshold 5
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97 "*Mouse-pointer's flight distance.
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98 If the cursor gets closer than this, the mouse pointer will move away.
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99 Only applies in mouse-avoidance-modes `animate' and `jump'.")
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100
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101 ;; Internal variables
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102 (defvar mouse-avoidance-state nil)
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103 (defvar mouse-avoidance-pointer-shapes nil)
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104 (defvar mouse-avoidance-n-pointer-shapes 0)
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105
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106 ;;; Functions:
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107
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108 ;; XEmacs change -- this is so ugly.
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109 (defun mouse-avoidance-point-position ()
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110 "Returns (WINDOW X . Y) of current point - analogous to mouse-position"
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111 (let* ((beg (window-start))
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112 (pos (point))
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113 (col (current-column))
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114 (row))
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115 (setq row (count-lines beg pos))
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116 (cons (selected-window) (cons col row))))
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117
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118 ;(defun mouse-avoidance-point-position-test ()
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119 ; (interactive)
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120 ; (message (format "point=%s mouse=%s"
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121 ; (cdr (mouse-avoidance-point-position))
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122 ; (cdr (mouse-position)))))
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123
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124 (defun mouse-avoidance-set-mouse-position (pos)
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125 ;; Carefully set mouse position to given position (X . Y)
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126 ;; Ideally, should check if X,Y is in the current frame, and if not,
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127 ;; leave the mouse where it was. However, this is currently
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128 ;; difficult to do, so we just raise the frame to avoid frame switches.
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129 ;; Returns t if it moved the mouse.
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130 (let ((f (selected-frame)))
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131 (raise-frame f)
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132 (set-mouse-position (frame-selected-window f) (car pos) (cdr pos))
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133 t))
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134
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135 (defun mouse-avoidance-too-close-p (mouse)
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136 ;; Return t if mouse pointer and point cursor are too close.
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137 ;; Acceptable distance is defined by mouse-avoidance-threshold.
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138 (let ((point (mouse-avoidance-point-position)))
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139 (and (eq (car mouse) (car point))
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140 (car (cdr mouse))
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141 (< (abs (- (car (cdr mouse)) (car (cdr point))))
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142 mouse-avoidance-threshold)
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143 (< (abs (- (cdr (cdr mouse)) (cdr (cdr point))))
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144 mouse-avoidance-threshold))))
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145
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146 (defun mouse-avoidance-banish-destination ()
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147 "The position to which mouse-avoidance-mode `banish' moves the mouse.
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148 You can redefine this if you want the mouse banished to a different corner."
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149 (cons (1- (frame-width))
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150 0))
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151
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152 (defun mouse-avoidance-banish-mouse ()
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153 ;; Put the mouse pointer in the upper-right corner of the current frame.
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154 (mouse-avoidance-set-mouse-position (mouse-avoidance-banish-destination)))
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155
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156 (defsubst mouse-avoidance-delta (cur delta dist var min max)
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157 ;; Decide how far to move in either dimension.
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158 ;; Args are the CURRENT location, the desired DELTA for
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159 ;; warp-conservation, the DISTANCE we like to move, the VARIABILITY
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160 ;; in distance allowed, and the MIN and MAX possible window positions.
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161 ;; Returns something as close to DELTA as possible withing the constraints.
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162 (let ((L1 (max (- min cur) (+ (- dist) (- var))))
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163 (R1 (+ (- dist) var ))
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164 (L2 (+ dist (- var)))
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165 (R2 (min (- max cur) (+ dist var))))
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166 (if (< R1 (- min cur)) (setq L1 nil R1 nil))
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167 (if (> L2 (- max cur)) (setq L2 nil R2 nil))
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168 (cond ((and L1 (< delta L1)) L1)
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169 ((and R1 (< delta R1)) delta)
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170 ((and R1 (< delta 0)) R1)
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171 ((and L2 (< delta L2)) L2)
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172 ((and R2 (< delta R2)) delta)
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173 (R2)
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174 ((or R1 L2))
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175 (t 0))))
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176
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177 (defun mouse-avoidance-nudge-mouse ()
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178 ;; Push the mouse a little way away, possibly animating the move
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179 ;; For these modes, state keeps track of the total offset that we've
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180 ;; accumulated, and tries to keep it close to zero.
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181 (let* ((cur (mouse-position))
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182 (cur-pos (cdr cur))
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183 (deltax (mouse-avoidance-delta
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184 (car cur-pos) (- (random mouse-avoidance-nudge-var)
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185 (car mouse-avoidance-state))
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186 mouse-avoidance-nudge-dist mouse-avoidance-nudge-var
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187 0 (frame-width)))
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188 (deltay (mouse-avoidance-delta
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189 (cdr cur-pos) (- (random mouse-avoidance-nudge-var)
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190 (cdr mouse-avoidance-state))
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191 mouse-avoidance-nudge-dist mouse-avoidance-nudge-var
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192 0 (window-height))))
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193 (setq mouse-avoidance-state
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194 (cons (+ (car mouse-avoidance-state) deltax)
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195 (+ (cdr mouse-avoidance-state) deltay)))
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196 (if (or (eq mouse-avoidance-mode 'animate)
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197 (eq mouse-avoidance-mode 'proteus))
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198 (let ((i 0.0)
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199 (color (cdr (assoc 'mouse-color (frame-parameters)))))
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200 (while (<= i 1)
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201 (mouse-avoidance-set-mouse-position
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202 (cons (+ (car cur-pos) (round (* i deltax)))
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203 (+ (cdr cur-pos) (round (* i deltay)))))
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204 (setq i (+ i (max .1 (/ 1.0 mouse-avoidance-nudge-dist))))
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205 (if (eq mouse-avoidance-mode 'proteus)
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206 (progn
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207 (setq x-pointer-shape (mouse-avoidance-random-shape))
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208 (set-mouse-color color)))
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209 (sit-for mouse-avoidance-animation-delay)))
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210 (mouse-avoidance-set-mouse-position (cons (+ (car (cdr cur)) deltax)
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211 (+ (cdr (cdr cur)) deltay))))))
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212
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213 (defun mouse-avoidance-random-shape ()
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214 "Return a random cursor shape.
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215 This assumes that any variable whose name begins with x-pointer- and
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216 has an integer value is a valid cursor shape. You might want to
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217 redefine this function to suit your own tastes."
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218 (if (null mouse-avoidance-pointer-shapes)
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219 (progn
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220 (setq mouse-avoidance-pointer-shapes
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221 (mapcar '(lambda (x) (symbol-value (intern x)))
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222 (all-completions "x-pointer-" obarray
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223 '(lambda (x)
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224 (and (boundp x)
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225 (integerp (symbol-value x)))))))
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226 (setq mouse-avoidance-n-pointer-shapes
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227 (length mouse-avoidance-pointer-shapes))))
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228 (nth (random mouse-avoidance-n-pointer-shapes)
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229 mouse-avoidance-pointer-shapes))
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230
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231 (defun mouse-avoidance-banish-hook ()
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232 (if (and (not executing-kbd-macro) ; don't check inside macro
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233 (mouse-avoidance-kbd-command (this-command-keys)))
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234 (mouse-avoidance-banish-mouse)))
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235
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236 (defun mouse-avoidance-exile-hook ()
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237 ;; For exile mode, the state is nil when the mouse is in its normal
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238 ;; position, and set to the old mouse-position when the mouse is in exile.
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239 (if (and (not executing-kbd-macro)
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240 (mouse-avoidance-kbd-command (this-command-keys)))
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241 (let ((mp (mouse-position)))
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242 (cond ((and (not mouse-avoidance-state)
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243 (mouse-avoidance-too-close-p mp))
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244 (setq mouse-avoidance-state mp)
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245 (mouse-avoidance-banish-mouse))
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246 ((and mouse-avoidance-state
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247 (not (mouse-avoidance-too-close-p mouse-avoidance-state)))
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248 (if (and (eq (car mp) (if (< emacs-minor-version 12)
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249 (selected-frame)
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250 (selected-window)))
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251 (equal (cdr mp) (mouse-avoidance-banish-destination)))
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252 (mouse-avoidance-set-mouse-position
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253 ;; move back only if user has not moved mouse
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254 (cdr mouse-avoidance-state)))
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255 ;; but clear state anyway, to be ready for another move
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256 (setq mouse-avoidance-state nil))))))
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257
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258 (defun mouse-avoidance-fancy-hook ()
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259 ;; Used for the "fancy" modes, ie jump et al.
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260 (if (and (not executing-kbd-macro) ; don't check inside macro
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261 (mouse-avoidance-kbd-command (this-command-keys))
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262 (mouse-avoidance-too-close-p (mouse-position)))
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263 (let ((old-pos (mouse-position)))
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264 (mouse-avoidance-nudge-mouse)
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265 (if (not (eq (if (< emacs-minor-version 12)
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266 (selected-frame)
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267 (selected-window)) (car old-pos))) ; move went awry
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268 (set-mouse-position (car old-pos) ; sigh..
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269 (car (cdr old-pos))
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270 (cdr (cdr old-pos)))))))
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271
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272 (defun mouse-avoidance-kbd-command (key)
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273 "Return t if the KEYSEQENCE is composed of keyboard events only.
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274 Return nil if there are any lists in the key sequence."
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275 (cond ((null key) nil) ; Null event seems to be
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276 ; returned occasionally.
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277 ((not (vectorp key)) t) ; Strings are keyboard events.
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278 ((catch 'done
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279 (let ((i 0)
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280 (l (length key)))
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281 (while (< i l)
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282 (if (listp (aref key i))
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283 (throw 'done nil))
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284 (setq i (1+ i))))
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285 t))))
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286
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287 (defun mouse-avoidance-mode (&optional mode)
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288 "Set cursor avoidance mode to MODE.
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289 MODE should be one of the symbols `banish', `exile', `jump', `animate',
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290 `cat-and-mouse', `proteus', or `none'.
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291
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292 If MODE is nil, toggle mouse avoidance between `none` and `banish'
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293 modes. Positive numbers and symbols other than the above are treated
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294 as equivalent to `banish'; negative numbers and `-' are equivalent to `none'.
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295
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296 Effects of the different modes:
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297 * banish: Move the mouse to the upper-right corner on any keypress.
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298 * exile: Move the mouse to the corner only if the cursor gets too close,
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299 and allow it to return once the cursor is out of the way.
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300 * jump: If the cursor gets too close to the mouse, displace the mouse
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301 a random distance & direction.
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302 * animate: As `jump', but shows steps along the way for illusion of motion.
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303 * cat-and-mouse: Same as `animate'.
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304 * proteus: As `animate', but changes the shape of the mouse pointer too.
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305
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306 Whenever the mouse is moved, the frame is also raised.
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307
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308 \(see `mouse-avoidance-threshold' for definition of \"too close\",
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309 and `mouse-avoidance-nudge-dist' and `mouse-avoidance-nudge-var' for
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310 definition of \"random distance\".)"
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311 (interactive
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312 (list (intern (completing-read
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313 "Select cursor avoidance technique (SPACE for list): "
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314 '(("banish") ("exile") ("jump") ("animate")
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315 ("cat-and-mouse") ("proteus") ("none"))
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316 nil t))))
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317 (if (eq mode 'cat-and-mouse)
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318 (setq mode 'animate))
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319 (setq post-command-hook
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320 (delete 'mouse-avoidance-banish-hook (append post-command-hook nil)))
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321 (setq post-command-hook
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322 (delete 'mouse-avoidance-exile-hook (append post-command-hook nil)))
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323 (setq post-command-hook
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324 (delete 'mouse-avoidance-fancy-hook (append post-command-hook nil)))
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325 (cond ((eq mode 'none)
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326 (setq mouse-avoidance-mode nil))
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327 ((or (eq mode 'jump)
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328 (eq mode 'animate)
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329 (eq mode 'proteus))
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330 (add-hook 'post-command-hook 'mouse-avoidance-fancy-hook)
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331 (setq mouse-avoidance-mode mode
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332 mouse-avoidance-state (cons 0 0)))
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333 ((eq mode 'exile)
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334 (add-hook 'post-command-hook 'mouse-avoidance-exile-hook)
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335 (setq mouse-avoidance-mode mode
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336 mouse-avoidance-state nil))
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337 ((or (eq mode 'banish)
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338 (eq mode t)
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339 (and (null mode) (null mouse-avoidance-mode))
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340 (and mode (> (prefix-numeric-value mode) 0)))
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341 (add-hook 'post-command-hook 'mouse-avoidance-banish-hook)
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342 (setq mouse-avoidance-mode 'banish))
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343 (t (setq mouse-avoidance-mode nil)))
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344 (force-mode-line-update))
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345
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346 ;(or (assq 'mouse-avoidance-mode minor-mode-alist)
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347 ; (setq minor-mode-alist (cons '(mouse-avoidance-mode " Avoid")
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348 ; minor-mode-alist)))
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349 ;;XEmacs: do it right.
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350 ;;;###autoload
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351 (add-minor-mode 'mouse-avoidance-mode " Avoid")
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352
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353 ;;; End of avoid.el
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