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1 ;;; blink-cursor.el --- Blink the cursor on or off
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2
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3 ;; Copyright (C) 1996 Ben Wing.
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4
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5 ;; Keywords: display
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: Not in FSF.
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24
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25 ;;; Commentary:
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26
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27 ;;; Code:
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28
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29 (defvar blink-cursor-last-selected-window nil)
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30 (defvar blink-cursor-lost-focus nil)
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31
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32 (defun blink-cursor-callback (foo)
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33 (let ((inhibit-quit t)
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34 (window (selected-window)))
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35 (if blink-cursor-lost-focus
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36 nil
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37 (or blink-cursor-last-selected-window
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38 (setq blink-cursor-last-selected-window window))
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39 (if (eq window blink-cursor-last-selected-window)
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40 (set-specifier text-cursor-visible-p
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41 (not (specifier-instance text-cursor-visible-p
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42 window))
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43 window)
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44 (remove-specifier text-cursor-visible-p
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45 blink-cursor-last-selected-window)
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46 (setq blink-cursor-last-selected-window window)
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47 (set-specifier text-cursor-visible-p nil window)))))
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48
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49 (defun blink-cursor-reenable-cursor ()
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50 (if blink-cursor-last-selected-window
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51 (progn
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52 (remove-specifier text-cursor-visible-p
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53 blink-cursor-last-selected-window)
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54 (setq blink-cursor-last-selected-window nil))))
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55
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56 (defun blink-cursor-deselect-frame-hook ()
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57 (blink-cursor-reenable-cursor)
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58 (setq blink-cursor-lost-focus t))
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59
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60 (defun blink-cursor-select-frame-hook ()
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61 (setq blink-cursor-lost-focus nil))
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62
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63 (add-hook 'deselect-frame-hook 'blink-cursor-deselect-frame-hook)
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64 (add-hook 'select-frame-hook 'blink-cursor-select-frame-hook)
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65
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66 (defvar blink-cursor-timeout 1.0)
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67 (defvar blink-cursor-timeout-id nil)
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68 (defvar blink-cursor-mode nil)
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69
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70 ;;;###autoload
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71 (defun blink-cursor-mode (&optional timeout)
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72 "Enable or disable a blinking cursor.
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73 If TIMEOUT is nil, toggle on or off.
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74 If TIMEOUT is t, enable with the previous timeout value.
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75 If TIMEOUT is 0, disable.
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76 If TIMEOUT is greater than 0, then the cursor will blink once
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77 each TIMEOUT secs (can be a float)."
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78 (interactive)
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79 (cond ((not timeout)
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80 (setq timeout blink-cursor-timeout)
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81 (setq blink-cursor-mode (not blink-cursor-mode)))
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82 ((eq timeout t)
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83 (setq timeout blink-cursor-timeout)
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84 (setq blink-cursor-mode t))
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85 ((<= timeout 0)
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86 (setq blink-cursor-mode nil))
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87 (t
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88 (setq blink-cursor-timeout timeout)
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89 (setq blink-cursor-mode t)))
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90 (if blink-cursor-timeout-id
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91 (progn
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92 (disable-timeout blink-cursor-timeout-id)
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93 (blink-cursor-reenable-cursor)
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94 (setq blink-cursor-timeout-id nil)))
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95 (if blink-cursor-mode
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96 (setq blink-cursor-timeout-id
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97 (add-timeout (/ (float timeout) 2) 'blink-cursor-callback nil
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98 (/ (float timeout) 2)))))
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