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1 ;;; avoid.el --- make mouse pointer stay out of the way of editing
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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@gnu.ai.mit.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, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Synched up with: FSF 19.34.
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27
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28 ;;; Commentary:
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29
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30 ;; For those who are annoyed by the mouse pointer obscuring text,
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31 ;; this mode moves the mouse pointer - either just a little out of
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32 ;; the way, or all the way to the corner of the frame.
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33 ;; To use, load or evaluate this file and type M-x mouse-avoidance-mode .
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34 ;; To set up permanently, put this file on your .emacs:
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35 ;;
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36 ;; (if window-system (mouse-avoidance-mode 'animate))
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37 ;;
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38 ;; The 'animate can be 'jump or 'banish or 'exile or 'protean if you prefer.
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39 ;; See the documentation for function `mouse-avoidance-mode' for
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40 ;; details of the different modes.
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41 ;;
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42 ;; For added silliness, make the animatee animate...
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43 ;; put something similar to the following into your .emacs:
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44 ;;
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45 ;; (if window-system
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46 ;; (mouse-avoidance-set-pointer-shape
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47 ;; (eval (nth (random 4)
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48 ;; '(x-pointer-man x-pointer-spider
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49 ;; x-pointer-gobbler x-pointer-gumby)))))
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50 ;;
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51 ;; For completely random pointer shape, replace the setq above with:
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52 ;; (setq x-pointer-shape (mouse-avoidance-random-shape))
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53 ;;
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54 ;; Bugs / Warnings / To-Do:
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55 ;;
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56 ;; - Using this code does slow emacs down. "banish" mode shouldn't
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57 ;; be too bad, and on my workstation even "animate" is reasonable.
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58 ;;
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59 ;; - It ought find out where any overlapping frames are and avoid them,
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60 ;; rather than always raising the frame.
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61
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62 ;; Credits:
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63 ;; This code was helped by all those who contributed suggestions,
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64 ;; fixes, and additions
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65 ;; Joe Harrington (and his advisor), for the original inspiration.
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66 ;; Ken Manheimer, for dreaming up the Protean mode.
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67 ;; Richard Stallman, for the awful cat-and-mouse pun, among other things.
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68 ;; Mike Williams, Denis Howe, Bill Benedetto, Chris Moore, Don Morris,
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69 ;; Simon Marshall, and M.S. Ashton, for their feedback.
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70
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71 ;;; Code:
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72
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73 (provide 'avoid)
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74
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75 ;;;###autoload
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76 (defvar mouse-avoidance-mode nil
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77 "Value is t or a symbol if the mouse pointer should avoid the cursor.
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78 See function `mouse-avoidance-mode' for possible values. Changing this
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79 variable is NOT the recommended way to change modes; use that function
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80 instead.")
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81
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82 (defvar mouse-avoidance-nudge-dist 15
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83 "*Average distance that mouse will be moved when approached by cursor.
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84 Only applies in mouse-avoidance-mode `jump' and its derivatives.
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85 For best results make this larger than `mouse-avoidance-threshold'.")
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86
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87 (defvar mouse-avoidance-nudge-var 10
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88 "*Variability of `mouse-avoidance-nudge-dist' (which see).")
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89
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90 (defvar mouse-avoidance-animation-delay .01
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91 "Delay between animation steps, in seconds.")
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92
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93 (defvar mouse-avoidance-threshold 5
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94 "*Mouse-pointer's flight distance.
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95 If the cursor gets closer than this, the mouse pointer will move away.
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96 Only applies in mouse-avoidance-modes `animate' and `jump'.")
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97
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98 ;; Internal variables
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99 (defvar mouse-avoidance-state nil)
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100 (defvar mouse-avoidance-pointer-shapes nil)
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101 (defvar mouse-avoidance-n-pointer-shapes 0)
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102 (defvar mouse-avoidance-old-pointer-shape nil)
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103
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104 ;;; Functions:
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105
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106 (defsubst mouse-avoidance-set-pointer-shape (shape)
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107 "Set the shape of the mouse pointer to SHAPE."
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108 (setq x-pointer-shape shape)
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109 (set-mouse-color nil))
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110
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111 ;; XEmacs change -- this is so ugly. [FSF version is totally different -sb]
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112 (defun mouse-avoidance-point-position ()
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113 "Returns (WINDOW X . Y) of current point - analogous to mouse-position"
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114 (let* ((beg (window-start))
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115 (pos (point))
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116 (col (current-column))
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117 (row))
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118 (setq row (count-lines beg pos))
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119 (cons (selected-window) (cons col row))))
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120
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121 ;(defun mouse-avoidance-point-position-test ()
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122 ; (interactive)
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123 ; (message (format "point=%s mouse=%s"
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124 ; (cdr (mouse-avoidance-point-position))
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125 ; (cdr (mouse-position)))))
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126
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127 (defun mouse-avoidance-set-mouse-position (pos)
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128 ;; Carefully set mouse position to given position (X . Y)
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129 ;; Ideally, should check if X,Y is in the current frame, and if not,
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130 ;; leave the mouse where it was. However, this is currently
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131 ;; difficult to do, so we just raise the frame to avoid frame switches.
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132 ;; Returns t if it moved the mouse.
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133 (let ((f (selected-frame)))
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134 (raise-frame f)
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135 ;; XEmacs: FSF version of set-mouse-position requires FRAME parameter
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136 (set-mouse-position (frame-selected-window f) (car pos) (cdr pos))
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137 t))
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138
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139 (defun mouse-avoidance-too-close-p (mouse)
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140 ;; Return t if mouse pointer and point cursor are too close.
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141 ;; Acceptable distance is defined by mouse-avoidance-threshold.
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142 (let ((point (mouse-avoidance-point-position)))
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143 (and (eq (car mouse) (car point))
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144 (car (cdr mouse))
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145 (< (abs (- (car (cdr mouse)) (car (cdr point))))
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146 mouse-avoidance-threshold)
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147 (< (abs (- (cdr (cdr mouse)) (cdr (cdr point))))
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148 mouse-avoidance-threshold))))
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149
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150 (defun mouse-avoidance-banish-destination ()
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151 "The position to which mouse-avoidance-mode `banish' moves the mouse.
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152 You can redefine this if you want the mouse banished to a different corner."
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153 (cons (1- (frame-width))
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154 0))
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155
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156 (defun mouse-avoidance-banish-mouse ()
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157 ;; Put the mouse pointer in the upper-right corner of the current frame.
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158 (mouse-avoidance-set-mouse-position (mouse-avoidance-banish-destination)))
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159
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160 (defsubst mouse-avoidance-delta (cur delta dist var min max)
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161 ;; Decide how far to move in either dimension.
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162 ;; Args are the CURRENT location, the desired DELTA for
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163 ;; warp-conservation, the DISTANCE we like to move, the VARIABILITY
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164 ;; in distance allowed, and the MIN and MAX possible window positions.
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165 ;; Returns something as close to DELTA as possible within the constraints.
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166 (let ((L1 (max (- min cur) (+ (- dist) (- var))))
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167 (R1 (+ (- dist) var ))
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168 (L2 (+ dist (- var)))
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169 (R2 (min (- max cur) (+ dist var))))
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170 (if (< R1 (- min cur)) (setq L1 nil R1 nil))
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171 (if (> L2 (- max cur)) (setq L2 nil R2 nil))
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172 (cond ((and L1 (< delta L1)) L1)
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173 ((and R1 (< delta R1)) delta)
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174 ((and R1 (< delta 0)) R1)
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175 ((and L2 (< delta L2)) L2)
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176 ((and R2 (< delta R2)) delta)
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177 (R2)
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178 ((or R1 L2))
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179 (t 0))))
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180
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181 (defun mouse-avoidance-nudge-mouse ()
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182 ;; Push the mouse a little way away, possibly animating the move
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183 ;; For these modes, state keeps track of the total offset that we've
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184 ;; accumulated, and tries to keep it close to zero.
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185 (let* ((cur (mouse-position))
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186 (cur-frame (car cur))
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187 (cur-pos (cdr cur))
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188 (deltax (mouse-avoidance-delta
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189 (car cur-pos) (- (random mouse-avoidance-nudge-var)
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190 (car mouse-avoidance-state))
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191 mouse-avoidance-nudge-dist mouse-avoidance-nudge-var
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192 0 (frame-width)))
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193 (deltay (mouse-avoidance-delta
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194 (cdr cur-pos) (- (random mouse-avoidance-nudge-var)
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195 (cdr mouse-avoidance-state))
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196 mouse-avoidance-nudge-dist mouse-avoidance-nudge-var
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197 0 (frame-height))))
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198 (setq mouse-avoidance-state
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199 (cons (+ (car mouse-avoidance-state) deltax)
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200 (+ (cdr mouse-avoidance-state) deltay)))
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201 (if (or (eq mouse-avoidance-mode 'animate)
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202 (eq mouse-avoidance-mode 'proteus))
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203 (let ((i 0.0)
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204 ;; XEmacs change
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205 (color (cdr (assoc 'mouse-color (frame-parameters)))))
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206 (while (<= i 1)
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207 (mouse-avoidance-set-mouse-position
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208 (cons (+ (car cur-pos) (round (* i deltax)))
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209 (+ (cdr cur-pos) (round (* i deltay)))))
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210 (setq i (+ i (max .1 (/ 1.0 mouse-avoidance-nudge-dist))))
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211 (if (eq mouse-avoidance-mode 'proteus)
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212 ;; XEmacs change
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213 (progn
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214 (setq x-pointer-shape (mouse-avoidance-random-shape))
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215 (set-mouse-color color)))
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216 (sit-for mouse-avoidance-animation-delay)))
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217 (mouse-avoidance-set-mouse-position (cons (+ (car (cdr cur)) deltax)
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218 (+ (cdr (cdr cur)) deltay))))))
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219
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220 (defun mouse-avoidance-random-shape ()
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221 "Return a random cursor shape.
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222 This assumes that any variable whose name begins with x-pointer- and
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223 has an integer value is a valid cursor shape. You might want to
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224 redefine this function to suit your own tastes."
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225 (if (null mouse-avoidance-pointer-shapes)
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226 (progn
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227 (setq mouse-avoidance-pointer-shapes
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228 (mapcar '(lambda (x) (symbol-value (intern x)))
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229 (all-completions "x-pointer-" obarray
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230 '(lambda (x)
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231 (and (boundp x)
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232 (integerp (symbol-value x)))))))
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233 (setq mouse-avoidance-n-pointer-shapes
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234 (length mouse-avoidance-pointer-shapes))))
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235 (nth (random mouse-avoidance-n-pointer-shapes)
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236 mouse-avoidance-pointer-shapes))
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237
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238 (defun mouse-avoidance-banish-hook ()
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239 (if (and (not executing-kbd-macro) ; don't check inside macro
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240 (mouse-avoidance-kbd-command (this-command-keys)))
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241 (mouse-avoidance-banish-mouse)))
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242
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243 (defun mouse-avoidance-exile-hook ()
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244 ;; For exile mode, the state is nil when the mouse is in its normal
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245 ;; position, and set to the old mouse-position when the mouse is in exile.
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246 (if (and (not executing-kbd-macro)
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247 (mouse-avoidance-kbd-command (this-command-keys)))
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248 (let ((mp (mouse-position)))
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249 (cond ((and (not mouse-avoidance-state)
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250 (mouse-avoidance-too-close-p mp))
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251 (setq mouse-avoidance-state mp)
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252 (mouse-avoidance-banish-mouse))
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253 ((and mouse-avoidance-state
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254 (not (mouse-avoidance-too-close-p mouse-avoidance-state)))
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255 ;; XEmacs change
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256 (if (and (eq (car mp) (if (< emacs-minor-version 12)
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257 (selected-frame)
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258 (selected-window)))
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259 (equal (cdr mp) (mouse-avoidance-banish-destination)))
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260 (mouse-avoidance-set-mouse-position
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261 ;; move back only if user has not moved mouse
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262 (cdr mouse-avoidance-state)))
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263 ;; but clear state anyway, to be ready for another move
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264 (setq mouse-avoidance-state nil))))))
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265
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266 (defun mouse-avoidance-fancy-hook ()
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267 ;; Used for the "fancy" modes, ie jump et al.
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268 (if (and (not executing-kbd-macro) ; don't check inside macro
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269 (mouse-avoidance-kbd-command (this-command-keys))
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270 (mouse-avoidance-too-close-p (mouse-position)))
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271 (let ((old-pos (mouse-position)))
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272 (mouse-avoidance-nudge-mouse)
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273 ;; XEmacs change
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274 (if (not (eq (if (< emacs-minor-version 12)
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275 (selected-frame)
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276 (selected-window)) (car old-pos))) ; move went awry
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277 (set-mouse-position (car old-pos) ; sigh..
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278 (car (cdr old-pos))
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279 (cdr (cdr old-pos)))))))
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280
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281 (defun mouse-avoidance-kbd-command (key)
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282 "Return t if the KEYSEQENCE is composed of keyboard events only.
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283 Return nil if there are any lists in the key sequence."
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284 (cond ((null key) nil) ; Null event seems to be
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285 ; returned occasionally.
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286 ((not (vectorp key)) t) ; Strings are keyboard events.
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287 ((catch 'done
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288 (let ((i 0)
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289 (l (length key)))
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290 (while (< i l)
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291 (if (listp (aref key i))
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292 (throw 'done nil))
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293 (setq i (1+ i))))
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294 t))))
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295
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296 ;;;###autoload
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297 (defun mouse-avoidance-mode (&optional mode)
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298 "Set cursor avoidance mode to MODE.
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299 MODE should be one of the symbols `banish', `exile', `jump', `animate',
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300 `cat-and-mouse', `proteus', or `none'.
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301
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302 If MODE is nil, toggle mouse avoidance between `none` and `banish'
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303 modes. Positive numbers and symbols other than the above are treated
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304 as equivalent to `banish'; negative numbers and `-' are equivalent to `none'.
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305
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306 Effects of the different modes:
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307 * banish: Move the mouse to the upper-right corner on any keypress.
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308 * exile: Move the mouse to the corner only if the cursor gets too close,
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309 and allow it to return once the cursor is out of the way.
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310 * jump: If the cursor gets too close to the mouse, displace the mouse
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311 a random distance & direction.
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312 * animate: As `jump', but shows steps along the way for illusion of motion.
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313 * cat-and-mouse: Same as `animate'.
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314 * proteus: As `animate', but changes the shape of the mouse pointer too.
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315
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316 Whenever the mouse is moved, the frame is also raised.
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317
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318 \(see `mouse-avoidance-threshold' for definition of \"too close\",
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319 and `mouse-avoidance-nudge-dist' and `mouse-avoidance-nudge-var' for
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320 definition of \"random distance\".)"
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321 (interactive
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322 (list (intern (completing-read
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323 "Select cursor avoidance technique (SPACE for list): "
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324 '(("banish") ("exile") ("jump") ("animate")
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325 ("cat-and-mouse") ("proteus") ("none"))
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326 nil t))))
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327 (if (eq mode 'cat-and-mouse)
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328 (setq mode 'animate))
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329 ;; XEmacs change - We don't have post-command-idle-hook
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330 (remove-hook 'post-command-hook 'mouse-avoidance-banish-hook)
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331 (remove-hook 'post-command-hook 'mouse-avoidance-exile-hook)
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332 (remove-hook 'post-command-hook 'mouse-avoidance-fancy-hook)
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333 ;; Restore pointer shape if necessary
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334 (if (eq mouse-avoidance-mode 'proteus)
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335 (mouse-avoidance-set-pointer-shape mouse-avoidance-old-pointer-shape))
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336
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337 ;; Do additional setup depending on version of mode requested
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338 (cond ((eq mode 'none)
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339 (setq mouse-avoidance-mode nil))
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340 ((or (eq mode 'jump)
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341 (eq mode 'animate)
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342 (eq mode 'proteus))
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2
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343 ;; XEmacs: we don't have post-command-idle-hook
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344 (add-hook 'post-command-hook 'mouse-avoidance-fancy-hook)
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345 (setq mouse-avoidance-mode mode
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346 mouse-avoidance-state (cons 0 0)
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347 mouse-avoidance-old-pointer-shape x-pointer-shape))
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348 ((eq mode 'exile)
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349 ;; XEmacs: FSF uses post-command-idle-hook
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0
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350 (add-hook 'post-command-hook 'mouse-avoidance-exile-hook)
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351 (setq mouse-avoidance-mode mode
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352 mouse-avoidance-state nil))
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353 ((or (eq mode 'banish)
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354 (eq mode t)
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355 (and (null mode) (null mouse-avoidance-mode))
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356 (and mode (> (prefix-numeric-value mode) 0)))
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2
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357 ;; XEmacs: FSF uses post-command-idle-hook
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0
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358 (add-hook 'post-command-hook 'mouse-avoidance-banish-hook)
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359 (setq mouse-avoidance-mode 'banish))
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360 (t (setq mouse-avoidance-mode nil)))
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361 (force-mode-line-update))
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362
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363 ;(or (assq 'mouse-avoidance-mode minor-mode-alist)
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364 ; (setq minor-mode-alist (cons '(mouse-avoidance-mode " Avoid")
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365 ; minor-mode-alist)))
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366 ;;XEmacs: do it right.
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367 ;;;###autoload
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368 (add-minor-mode 'mouse-avoidance-mode " Avoid")
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369
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14
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370 ;;; avoid.el ends here
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