lisp/t-mouse.el

   1 ;;; t-mouse.el --- mouse support within the text terminal
   2
   3 ;; Author: Nick Roberts <nickrob@gnu.org>
   4 ;; Maintainer: FSF
   5 ;; Keywords: mouse gpm linux
   6
   7 ;; Copyright (C) 1994, 1995, 1998, 2006, 2007, 2008, 2009, 2010, 2011
   8 ;;   Free Software Foundation, Inc.
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; This package provides access to mouse event as reported by the gpm-Linux
  28 ;; package. It tries to reproduce the functionality offered by Emacs under X.
  29 ;; The "gpm" server runs under Linux, so this package is rather
  30 ;; Linux-dependent.
  31
  32 ;; The file, t-mouse.el was originally written by Alessandro Rubini and Ian T
  33 ;; Zimmerman, and Emacs communicated with gpm through a client program called
  34 ;; mev.  Now the interface with gpm is directly through a Unix socket, so this
  35 ;; file is reduced to a single minor mode macro call.
  36
  37 ;;
  38 \f
  39 ;;; Code:
  40
  41 ;; Prevent warning when compiling in an Emacs without gpm support.
  42 (declare-function gpm-mouse-start "term.c" ())
  43
  44 (defun gpm-mouse-enable ()
  45   "Try to enable gpm mouse support on the current terminal."
  46   (let ((activated nil))
  47     (unwind-protect
  48         (progn
  49           (unless (fboundp 'gpm-mouse-start)
  50             (error "Emacs must be built with Gpm to use this mode"))
  51           (when gpm-mouse-mode
  52             (gpm-mouse-start)
  53             (set-terminal-parameter nil 'gpm-mouse-active t)
  54             (setq activated t)))
  55       ;; If something failed to turn it on, try to turn it off as well,
  56       ;; just in case.
  57       (unless activated (gpm-mouse-disable)))))
  58
  59 (defun gpm-mouse-disable ()
  60   "Try to disable gpm mouse support on the current terminal."
  61   (when (fboundp 'gpm-mouse-stop)
  62     (gpm-mouse-stop))
  63   (set-terminal-parameter nil 'gpm-mouse-active nil))
  64
  65 ;;;###autoload
  66 (define-obsolete-function-alias 't-mouse-mode 'gpm-mouse-mode "23.1")
  67 ;;;###autoload
  68 (define-minor-mode gpm-mouse-mode
  69   "Toggle gpm-mouse mode to use the mouse in GNU/Linux consoles.
  70 With prefix arg, turn gpm-mouse mode on if arg is positive,
  71 otherwise turn it off.
  72
  73 This allows the use of the mouse when operating on a GNU/Linux console,
  74 in the same way as you can use the mouse under X11.
  75 It relies on the `gpm' daemon being activated."
  76   :global t :group 'mouse :init-value t
  77   (dolist (terminal (terminal-list))
  78     (when (and (eq t (terminal-live-p terminal))
  79                (not (eq gpm-mouse-mode
  80                         (terminal-parameter terminal 'gpm-mouse-active))))
  81       ;; Simulate selecting a terminal by selecting one of its frames ;-(
  82       (with-selected-frame (car (frames-on-display-list terminal))
  83         (if gpm-mouse-mode (gpm-mouse-enable) (gpm-mouse-disable))))))
  84
  85 (provide 't-mouse)
  86
  87 ;; arch-tag: a63163b3-bfbe-4eb2-ab4f-201cd164b05d
  88 ;;; t-mouse.el ends here