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460 lines
18 KiB
EmacsLisp
460 lines
18 KiB
EmacsLisp
;;; avoid.el --- make mouse pointer stay out of the way of editing -*- lexical-binding: t -*-
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;; Copyright (C) 1993-1994, 2000-2022 Free Software Foundation, Inc.
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;; Author: Boris Goldowsky <boris@gnu.org>
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;; Keywords: mouse
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; For those who are annoyed by the mouse pointer obscuring text,
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;; this mode moves the mouse pointer - either just a little out of
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;; the way, or all the way to the corner of the frame.
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;;
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;; To use, type `M-x mouse-avoidance-mode'.
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;;
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;; To set up permanently, put this in your .emacs:
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;;
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;; (if (display-mouse-p) (mouse-avoidance-mode 'animate))
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;;
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;; Other legitimate alternatives include
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;; `banish', `exile', `jump', `cat-and-mouse', and `proteus'.
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;; They do somewhat different things.
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;; See the documentation for function `mouse-avoidance-mode' for
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;; details of the different modes.
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;;
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;; For added silliness, make the animatee animate...
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;; put something similar to the following into your .emacs:
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;;
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;; (if (eq window-system 'x)
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;; (mouse-avoidance-set-pointer-shape
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;; (seq-random-elt
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;; (list x-pointer-man x-pointer-spider
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;; x-pointer-gobbler x-pointer-gumby))))
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;;
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;; For completely random pointer shape, replace the setq above with:
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;; (setq x-pointer-shape (mouse-avoidance-random-shape))
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;; Credits:
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;; This code was helped by all those who contributed suggestions,
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;; fixes, and additions
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;; Joe Harrington (and his advisor), for the original inspiration.
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;; Ken Manheimer, for dreaming up the Protean mode.
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;; Richard Stallman, for the awful cat-and-mouse pun, among other things.
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;; Mike Williams, Denis Howe, Bill Benedetto, Chris Moore, Don Morris,
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;; Simon Marshall, and M.S. Ashton, for their feedback.
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;;; Code:
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(eval-when-compile (require 'cl-lib))
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(defgroup avoid nil
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"Make mouse pointer stay out of the way of editing."
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:prefix "mouse-avoidance-"
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:group 'mouse)
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;;;###autoload
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(defcustom mouse-avoidance-mode nil
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"Activate Mouse Avoidance mode.
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See function `mouse-avoidance-mode' for possible values.
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Setting this variable directly does not take effect;
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use either \\[customize] or \\[mouse-avoidance-mode]."
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:set (lambda (_symbol value)
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;; 'none below prevents toggling when value is nil.
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(mouse-avoidance-mode (or value 'none)))
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:initialize 'custom-initialize-default
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:type '(choice (const :tag "none" nil) (const banish) (const jump)
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(const animate) (const exile) (const proteus))
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:require 'avoid
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:version "20.3")
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(defcustom mouse-avoidance-nudge-dist 15
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"Average distance that mouse will be moved when approached by cursor.
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Only applies in Mouse Avoidance mode `jump' and its derivatives.
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For best results make this larger than `mouse-avoidance-threshold'."
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:type 'integer)
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(defcustom mouse-avoidance-nudge-var 10
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"Variability of `mouse-avoidance-nudge-dist' (which see)."
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:type 'integer)
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(defcustom mouse-avoidance-animation-delay .01
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"Delay between animation steps, in seconds."
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:type 'number)
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(defcustom mouse-avoidance-threshold 5
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"Mouse-pointer's flight distance.
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If the cursor gets closer than this, the mouse pointer will move away.
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Only applies in Mouse Avoidance modes `animate' and `jump'."
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:type 'integer)
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(defcustom mouse-avoidance-banish-position '((frame-or-window . frame)
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(side . right)
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(side-pos . 3)
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(top-or-bottom . top)
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(top-or-bottom-pos . 0))
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"Position to which Mouse Avoidance mode `banish' moves the mouse.
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An alist where keywords mean:
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FRAME-OR-WINDOW: banish the mouse to corner of frame or window.
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SIDE: banish the mouse on right or left corner of frame or window.
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SIDE-POS: Distance from right or left edge of frame or window.
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TOP-OR-BOTTOM: banish the mouse to top or bottom of frame or window.
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TOP-OR-BOTTOM-POS: Distance from top or bottom edge of frame or window."
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:group 'avoid
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:version "24.3"
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:type '(alist :key-type symbol :value-type (choice symbol integer))
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:options '((frame-or-window symbol) (side symbol) (side-pos integer)
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(top-or-bottom symbol) (top-or-bottom-pos integer)))
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;; Internal variables
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(defvar mouse-avoidance-state nil)
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(defvar mouse-avoidance-pointer-shapes nil)
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(defvar mouse-avoidance-old-pointer-shape nil)
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(defvar mouse-avoidance-animating-pointer nil)
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;; This timer is used to run something when Emacs is idle.
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(defvar mouse-avoidance-timer nil)
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;;; Functions:
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(defsubst mouse-avoidance-set-pointer-shape (shape)
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"Set the shape of the mouse pointer to SHAPE."
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(when (boundp 'x-pointer-shape)
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(setq x-pointer-shape shape)
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(set-mouse-color nil)))
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(defun mouse-avoidance-point-position ()
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"Return the position of point as (FRAME X . Y).
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Analogous to `mouse-position'."
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(let* ((edges (window-inside-edges))
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(posn-at-point (posn-at-point))
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(x-y (and posn-at-point (posn-x-y posn-at-point))))
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(when x-y
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(cons (selected-frame)
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(cons (+ (car edges)
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(/ (car x-y) (frame-char-width)))
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(+ (car (cdr edges))
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(/ (cdr x-y) (frame-char-height))))))))
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;(defun mouse-avoidance-point-position-test ()
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; (interactive)
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; (message "point=%s mouse=%s"
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; (cdr (mouse-avoidance-point-position))
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; (cdr (mouse-position))))
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(defun mouse-avoidance-set-mouse-position (pos)
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;; Carefully set mouse position to given position (X . Y)
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;; Returns t if it moved the mouse.
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(let ((f (selected-frame)))
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(set-mouse-position f (car pos) (cdr pos))
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t))
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(defun mouse-avoidance-too-close-p (mouse)
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"Return t if mouse pointer and point cursor are too close.
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MOUSE is the current mouse position as returned by `mouse-position'.
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Acceptable distance is defined by `mouse-avoidance-threshold'."
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(let* ((frame (car mouse))
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(mouse-y (cdr (cdr mouse)))
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(tool-bar-lines (frame-parameter nil 'tool-bar-lines))
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point)
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(or tool-bar-lines
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(setq tool-bar-lines 0))
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(cond
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((and mouse-y (< mouse-y tool-bar-lines))
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nil)
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((setq point (mouse-avoidance-point-position))
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(let ((mouse-x (car (cdr mouse))))
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(and (eq frame (car point))
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(not (null mouse-x))
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(< (abs (- mouse-x (car (cdr point))))
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mouse-avoidance-threshold)
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(< (abs (- mouse-y (cdr (cdr point))))
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mouse-avoidance-threshold)))))))
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(defun mouse-avoidance-banish-destination ()
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"The position to which Mouse Avoidance mode `banish' moves the mouse.
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If you want the mouse banished to a different corner set
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`mouse-avoidance-banish-position' as you need."
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(let* ((fra-or-win (assoc-default
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'frame-or-window
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mouse-avoidance-banish-position 'eq))
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(list-values (pcase fra-or-win
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('frame (list 0 0 (frame-width) (frame-height)))
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('window (window-edges))))
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(alist (cl-loop for v in list-values
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for k in '(left top right bottom)
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collect (cons k v)))
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(side (assoc-default
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'side
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mouse-avoidance-banish-position #'eq))
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(side-dist (assoc-default
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'side-pos
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mouse-avoidance-banish-position #'eq))
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(top-or-bottom (assoc-default
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'top-or-bottom
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mouse-avoidance-banish-position #'eq))
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(top-or-bottom-dist (assoc-default
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'top-or-bottom-pos
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mouse-avoidance-banish-position #'eq))
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(side-fn (pcase side
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('left '+)
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('right '-)))
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(top-or-bottom-fn (pcase top-or-bottom
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('top '+)
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('bottom '-))))
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(cons (funcall side-fn ; -/+
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(assoc-default side alist 'eq) ; right or left
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side-dist) ; distance from side
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(funcall top-or-bottom-fn ; -/+
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(assoc-default top-or-bottom alist 'eq) ; top/bottom
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top-or-bottom-dist)))) ; distance from top/bottom
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(defun mouse-avoidance-banish-mouse ()
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"Put the mouse pointer to `mouse-avoidance-banish-position'."
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(mouse-avoidance-set-mouse-position (mouse-avoidance-banish-destination)))
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(defsubst mouse-avoidance-delta (cur delta dist var min max)
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;; Decide how far to move in either dimension.
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;; Args are the CURRENT location, the desired DELTA for
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;; warp-conservation, the DISTANCE we like to move, the VARIABILITY
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;; in distance allowed, and the MIN and MAX possible window positions.
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;; Returns something as close to DELTA as possible within the constraints.
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(let ((L1 (max (- min cur) (+ (- dist) (- var))))
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(R1 (+ (- dist) var ))
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(L2 (+ dist (- var)))
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(R2 (min (- max cur) (+ dist var))))
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(if (< R1 (- min cur)) (setq L1 nil R1 nil))
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(if (> L2 (- max cur)) (setq L2 nil R2 nil))
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(cond ((and L1 (< delta L1)) L1)
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((and R1 (< delta R1)) delta)
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((and R1 (< delta 0)) R1)
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((and L2 (< delta L2)) L2)
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((and R2 (< delta R2)) delta)
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(R2)
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((or R1 L2))
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(t 0))))
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(defun mouse-avoidance-nudge-mouse ()
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"Push the mouse a little way away, possibly animating the move.
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For these modes, state keeps track of the total offset that we've
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accumulated, and tries to keep it close to zero."
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(let* ((cur (mouse-position))
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(cur-pos (cdr cur))
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(pos (window-edges))
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(wleft (pop pos))
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(wtop (pop pos))
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(wright (pop pos))
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(wbot (pop pos))
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(deltax (mouse-avoidance-delta
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(car cur-pos) (- (random mouse-avoidance-nudge-var)
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(car mouse-avoidance-state))
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mouse-avoidance-nudge-dist mouse-avoidance-nudge-var
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wleft (1- wright)))
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(deltay (mouse-avoidance-delta
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(cdr cur-pos) (- (random mouse-avoidance-nudge-var)
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(cdr mouse-avoidance-state))
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mouse-avoidance-nudge-dist mouse-avoidance-nudge-var
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wtop (1- wbot))))
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(setq mouse-avoidance-state
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(cons (+ (car mouse-avoidance-state) deltax)
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(+ (cdr mouse-avoidance-state) deltay)))
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(if (or (eq mouse-avoidance-mode 'animate)
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(eq mouse-avoidance-mode 'proteus))
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(let ((i 0.0)
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(incr (max .1 (/ 1.0 mouse-avoidance-nudge-dist))))
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(setq mouse-avoidance-animating-pointer t)
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(while (<= i 1)
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(mouse-avoidance-set-mouse-position
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(cons (+ (car cur-pos) (round (* i deltax)))
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(+ (cdr cur-pos) (round (* i deltay)))))
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(setq i (+ i incr))
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(if (eq mouse-avoidance-mode 'proteus)
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(mouse-avoidance-set-pointer-shape
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(mouse-avoidance-random-shape)))
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(sit-for mouse-avoidance-animation-delay))
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(setq mouse-avoidance-animating-pointer nil))
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(mouse-avoidance-set-mouse-position (cons (+ (car (cdr cur)) deltax)
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(+ (cdr (cdr cur)) deltay))))))
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(defvar x-pointer-invisible) ; silence byte-compiler
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(defun mouse-avoidance-random-shape ()
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"Return a random cursor shape.
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This assumes that any variable whose name begins with x-pointer- and
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has an integer value is a valid cursor shape. You might want to
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redefine this function to suit your own tastes."
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(if (null mouse-avoidance-pointer-shapes)
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(progn
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(dolist (i (all-completions "x-pointer-" obarray
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(lambda (x)
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(and (boundp x)
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(integerp (symbol-value x))))))
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(ignore-errors
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(let ((value (symbol-value (intern i))))
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(when (< value x-pointer-invisible)
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(push value mouse-avoidance-pointer-shapes)))))))
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(seq-random-elt mouse-avoidance-pointer-shapes))
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(defun mouse-avoidance-ignore-p ()
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(let ((mp (mouse-position)))
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(or (not (frame-pointer-visible-p)) ; The pointer is hidden
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(not cursor-type) ; There's no cursor
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executing-kbd-macro ; don't check inside macro
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(null (cadr mp)) ; don't move unless in an Emacs frame
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(not (eq (car mp) (selected-frame)))
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;; Don't interfere with ongoing `mouse-drag-and-drop-region'
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;; (Bug#36269).
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(or (eq track-mouse 'dropping)
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(eq track-mouse 'drag-source))
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;; Don't do anything if last event was a mouse event.
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;; FIXME: this code fails in the case where the mouse was moved
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;; since the last key-press but without generating any event.
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(and (consp last-input-event)
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(symbolp (car last-input-event))
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(let ((modifiers (event-modifiers (car last-input-event))))
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(or (memq (car last-input-event)
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'(mouse-movement scroll-bar-movement
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select-window focus-out))
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(memq 'click modifiers)
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(memq 'double modifiers)
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(memq 'triple modifiers)
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(memq 'drag modifiers)
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(memq 'down modifiers)
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(memq 'meta modifiers)
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(memq 'control modifiers)
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(memq 'shift modifiers)
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(memq 'hyper modifiers)
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(memq 'super modifiers)
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(memq 'alt modifiers)))))))
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(defun mouse-avoidance-banish ()
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(if (not (mouse-avoidance-ignore-p))
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(mouse-avoidance-banish-mouse)))
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(defun mouse-avoidance-exile ()
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;; For exile mode, the state is nil when the mouse is in its normal
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;; position, and set to the old mouse-position when the mouse is in exile.
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(if (not (mouse-avoidance-ignore-p))
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(let ((mp (mouse-position)))
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(cond ((and (not mouse-avoidance-state)
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(mouse-avoidance-too-close-p mp))
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(setq mouse-avoidance-state mp)
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(mouse-avoidance-banish-mouse))
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((and mouse-avoidance-state
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(not (mouse-avoidance-too-close-p mouse-avoidance-state)))
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(if (and (eq (car mp) (selected-frame))
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(equal (cdr mp) (mouse-avoidance-banish-destination)))
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(mouse-avoidance-set-mouse-position
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;; move back only if user has not moved mouse
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(cdr mouse-avoidance-state)))
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;; but clear state anyway, to be ready for another move
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(setq mouse-avoidance-state nil))))))
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(defun mouse-avoidance-fancy ()
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;; Used for the "fancy" modes, i.e. jump et al.
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(if (and (not mouse-avoidance-animating-pointer)
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(not (mouse-avoidance-ignore-p))
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(mouse-avoidance-too-close-p (mouse-position)))
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(let ((old-pos (mouse-position)))
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(mouse-avoidance-nudge-mouse)
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(if (not (eq (selected-frame) (car old-pos)))
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;; This should never happen.
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(apply #'set-mouse-position old-pos)))))
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;;;###autoload
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(defun mouse-avoidance-mode (&optional mode)
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"Set Mouse Avoidance mode to MODE.
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MODE should be one of the symbols `banish', `exile', `jump', `animate',
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`cat-and-mouse', `proteus', or `none'.
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If MODE is nil, toggle mouse avoidance between `none' and `banish'
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modes. Positive numbers and symbols other than the above are treated
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as equivalent to `banish'; negative numbers and `-' are equivalent to `none'.
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Effects of the different modes:
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* banish: Move the mouse to the upper-right corner on any keypress.
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* exile: Move the mouse to the corner only if the cursor gets too close,
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and allow it to return once the cursor is out of the way.
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* jump: If the cursor gets too close to the mouse, displace the mouse
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a random distance & direction.
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* animate: As `jump', but shows steps along the way for illusion of motion.
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* cat-and-mouse: Same as `animate'.
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* proteus: As `animate', but changes the shape of the mouse pointer too.
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\(See `mouse-avoidance-threshold' for definition of \"too close\",
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and `mouse-avoidance-nudge-dist' and `mouse-avoidance-nudge-var' for
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definition of \"random distance\".)"
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(interactive
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(list (intern (completing-read
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"Select cursor avoidance technique (SPACE for list): "
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'(("banish") ("exile") ("jump") ("animate")
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("cat-and-mouse") ("proteus") ("none"))
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nil t))))
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(if (eq mode 'cat-and-mouse)
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(setq mode 'animate))
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(if mouse-avoidance-timer
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(cancel-timer mouse-avoidance-timer))
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(setq mouse-avoidance-timer nil)
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;; Restore pointer shape if necessary
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(if (eq mouse-avoidance-mode 'proteus)
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(mouse-avoidance-set-pointer-shape mouse-avoidance-old-pointer-shape))
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;; Do additional setup depending on version of mode requested
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(cond ((eq mode 'none)
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(setq mouse-avoidance-mode nil))
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((or (eq mode 'jump)
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(eq mode 'animate)
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(eq mode 'proteus))
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(setq mouse-avoidance-timer
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(run-with-idle-timer 0.1 t 'mouse-avoidance-fancy))
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(setq mouse-avoidance-mode mode
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mouse-avoidance-state (cons 0 0)
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mouse-avoidance-old-pointer-shape
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(and (boundp 'x-pointer-shape) x-pointer-shape)))
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((eq mode 'exile)
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(setq mouse-avoidance-timer
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(run-with-idle-timer 0.1 t 'mouse-avoidance-exile))
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(setq mouse-avoidance-mode mode
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mouse-avoidance-state nil))
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((or (eq mode 'banish)
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(eq mode t)
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(and (null mode) (null mouse-avoidance-mode))
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(and mode (> (prefix-numeric-value mode) 0)))
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(setq mouse-avoidance-timer
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(run-with-idle-timer 0.1 t 'mouse-avoidance-banish))
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(setq mouse-avoidance-mode 'banish))
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(t (setq mouse-avoidance-mode nil)))
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(force-mode-line-update))
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;; Most people who use avoid mode leave it on all the time, so it's not
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;; very informative to announce it in the mode line.
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;;(or (assq 'mouse-avoidance-mode minor-mode-alist)
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;; (setq minor-mode-alist (cons '(mouse-avoidance-mode " Avoid")
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;; minor-mode-alist)))
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;; Needed for custom.
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(if mouse-avoidance-mode
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(mouse-avoidance-mode mouse-avoidance-mode))
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(provide 'avoid)
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;;; avoid.el ends here
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