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1 ;;; gpm.el --- Support the mouse when emacs run on a Linux console.
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2
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3 ;; Copyright (C) 1999 Free Software Foundation
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4
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5 ;; Author: William Perry <wmperry@gnu.org>
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6 ;; Keywords: mouse, terminals
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify
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11 ;; it under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 (defvar gpm-enabled-devices (make-hash-table :test 'eq
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26 :size 13
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27 :weakness 'key)
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28 "A hash table of devices with GPM currently turned on.")
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29
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30 (defun gpm-mode (&optional arg device)
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31 "Toggle GPM mouse mode.
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32 With prefix arg, turn GPM mouse mode on if and only if arg is positive."
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33 (interactive (list current-prefix-arg (selected-device)))
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34 (with-fboundp 'gpm-enable
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35 (cond
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36 ((null arg) ; Toggle
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37 (if (gethash device gpm-enabled-devices)
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38 (progn
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39 (gpm-enable device nil)
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40 (remhash device gpm-enabled-devices))
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41 (gpm-enable device t)
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42 (puthash device t gpm-enabled-devices)))
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43 ((> arg 0) ; Turn on
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44 (gpm-enable device t)
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45 (puthash device t gpm-enabled-devices))
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46 ((gethash device gpm-enabled-devices) ; Turn off
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47 (gpm-enable device nil)
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48 (remhash device gpm-enabled-devices)))))
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49
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50 (defun turn-on-gpm-mouse-tracking (&optional device)
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51 ;; Enable mouse tracking on linux console
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52 (gpm-mode 5 device))
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53
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54 (defun turn-off-gpm-mouse-tracking (&optional device)
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55 ;; Disable mouse tracking on linux console
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56 (gpm-mode -5 device))
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57
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58 (defun gpm-is-supported-p (device)
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59 "Returns non-nil if GPM is usable right now on DEVICE in this XEmacs session.
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60 This checks whether GPM support was compiled in, TTY support was
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61 compiled in, XEmacs is running on Linux, the current console/device is
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62 TTY, and its terminal type has been set to `linux'."
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63 (and (not noninteractive) ; Don't want to do this in batch mode
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64 (fboundp 'gpm-enable) ; Must have C-level GPM support
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65 (eq system-type 'linux) ; Must be running linux
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66 (eq (device-type device) 'tty) ; on a tty
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67 (equal "linux" (declare-fboundp ; an a linux terminal type
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68 (console-tty-terminal-type (device-console device))))))
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69
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70 (defun gpm-create-device-hook (device)
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71 (if (gpm-is-supported-p device)
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72 (turn-on-gpm-mouse-tracking device)))
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73
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74 (defun gpm-delete-device-hook (device)
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75 (if (gpm-is-supported-p device)
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76 (turn-off-gpm-mouse-tracking device)))
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77
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78 ;; Restore normal mouse behavior outside Emacs
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79
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80 (add-hook 'suspend-hook 'turn-off-gpm-mouse-tracking)
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81 (add-hook 'suspend-resume-hook 'turn-on-gpm-mouse-tracking)
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82 (add-hook 'create-device-hook 'gpm-create-device-hook)
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83 (add-hook 'delete-device-hook 'gpm-delete-device-hook)
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84
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85 (provide 'gpm)
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