lisp/xt-mouse.el

   1 ;;; xt-mouse.el --- Support the mouse when emacs run in an xterm.
   2
   3 ;; Copyright (C) 1994 Free Software Foundation
   4
   5 ;; Author: Per Abrahamsen <abraham@iesd.auc.dk>
   6 ;; Keywords: mouse, terminals
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Comments:
  26
  27 ;; Enable mouse support when running inside an xterm or Linux console.
  28
  29 ;; This is actually useful when you are running X11 locally, but is
  30 ;; working on remote machine over a modem line or through a gateway.
  31
  32 ;; It works by translating xterm escape codes into generic emacs mouse
  33 ;; events so it should work with any package that uses the mouse.
  34
  35 ;; The xterm mouse escape codes are supposedly also supported by the
  36 ;; Linux console, but I have not been able to verify this.
  37
  38 ;; You don't have to turn off xterm mode to use the normal xterm mouse
  39 ;; functionality, it is still available by holding down the SHIFT key
  40 ;; when you press the mouse button.
  41
  42 ;;; Todo:
  43
  44 ;; Support multi-click -- somehow.
  45
  46 ;; Clicking on the mode-line does not work, although it should.
  47
  48 ;;; Code:
  49
  50 (define-key function-key-map "\e[M" 'xterm-mouse-translate)
  51
  52 (defvar xterm-mouse-last)
  53
  54 (defun xterm-mouse-translate (event)
  55   ;; Read a click and release event from XTerm.
  56   (save-excursion
  57     (save-window-excursion
  58       (deactivate-mark)
  59       (let* ((xterm-mouse-last)
  60              (down (xterm-mouse-event))
  61              (down-command (nth 0 down))
  62              (down-data (nth 1 down))
  63              (down-where (nth 1 down-data))
  64              (down-binding (key-binding (if (symbolp down-where)
  65                                             (vector down-where down-command)
  66                                           (vector down-command)))))
  67         (or (and (eq (read-char) ?\e)
  68                  (eq (read-char) ?\[)
  69                  (eq (read-char) ?M))
  70             (error "Unexpected escape sequence from XTerm"))
  71         (let* ((click (xterm-mouse-event))
  72                (click-command (nth 0 click))
  73                (click-data (nth 1 click))
  74                (click-where (nth 1 click-data)))
  75           (if (memq down-binding '(nil ignore))
  76               (if (and (symbolp click-where)
  77                        (not (eq 'menu-bar click-where)))
  78                   (vector (list click-where click-data) click)
  79                 (vector click))
  80             (setq unread-command-events
  81                   (if (eq down-where click-where)
  82                       (list click)
  83                     (list
  84                      ;; Cheat `mouse-drag-region' with move event.
  85                      (list 'mouse-movement click-data)
  86                      ;; Generate a drag event.
  87                      (if (symbolp down-where)
  88                          0
  89                        (list (intern (concat "drag-mouse-" (+ 1 xterm-mouse-last)))
  90                              down-data click-data))
  91                      )))
  92             (if (and (symbolp down-where)
  93                      (not (eq 'menu-bar down-where)))
  94                 (vector (list down-where down-data) down)
  95               (vector down))))))))
  96
  97 (defvar xterm-mouse-x 0
  98   "Position of last xterm mouse event relative to the frame.")
  99
 100 (defvar xterm-mouse-y 0
 101   "Position of last xterm mouse event relative to the frame.")
 102
 103 (defadvice mouse-position (around xterm-mouse activate)
 104   "Use last key from xterm-mouse-mode if available."
 105   (let ((answer ad-do-it))
 106     (setq ad-return-value
 107           (if xterm-mouse-mode
 108               (cons (car answer) (cons xterm-mouse-x xterm-mouse-y))
 109             answer))))
 110
 111 (defun xterm-mouse-event ()
 112   ;; Convert XTerm mouse event to Emacs mouse event.
 113   (let* ((type (- (read-char) ? ))
 114          (x (- (read-char) ?  1))
 115          (y (- (read-char) ?  1))
 116          (point (cons x y))
 117          (window (window-at x y))
 118          (where (if window
 119                     (coordinates-in-window-p point window)
 120                   'menu-bar))
 121          (pos (if (consp where)
 122                   (progn
 123                     (select-window window)
 124                     (goto-char (window-start window))
 125                     (move-to-window-line  (cdr where))
 126                     (move-to-column (+ (car where) (current-column)
 127                                        (max 0 (1- (window-hscroll)))))
 128                     (point))
 129                 where))
 130          (mouse (intern (if (eq type 3)
 131                             (concat "mouse-" (+ 1 xterm-mouse-last))
 132                           (setq xterm-mouse-last type)
 133                           (concat "down-mouse-" (+ 1 type))))))
 134     (setq xterm-mouse-x x
 135           xterm-mouse-y y)
 136     (list mouse
 137           (list window pos point
 138                 (/ (nth 2 (current-time)) 1000)))))
 139
 140 ;; Indicator for the xterm-mouse mode.
 141 (defvar xterm-mouse-mode nil)
 142
 143 (or (assq 'xterm-mouse-mode minor-mode-alist)
 144     (setq minor-mode-alist
 145           (cons '(xterm-mouse-mode (" Mouse")) minor-mode-alist)))
 146
 147 ;;;###autoload
 148 (defun xterm-mouse-mode (arg)
 149   "Toggle XTerm mouse mode.
 150 With prefix arg, turn XTerm mouse mode on iff arg is positive.
 151
 152 Turn it on to use emacs mouse commands, and off to use xterm mouse commands."
 153   (interactive "P")
 154   (if (or (and (null arg) xterm-mouse-mode)
 155           (<= (prefix-numeric-value arg) 0))
 156       ;; Turn it off
 157       (if xterm-mouse-mode
 158           (progn
 159             (turn-off-xterm-mouse-tracking)
 160             (setq xterm-mouse-mode nil)
 161             (set-buffer-modified-p (buffer-modified-p))))
 162     ;;Turn it on
 163     (if xterm-mouse-mode
 164         ()
 165       (setq xterm-mouse-mode t)
 166       (turn-on-xterm-mouse-tracking)
 167       (set-buffer-modified-p (buffer-modified-p)))))
 168
 169 (defun turn-on-xterm-mouse-tracking ()
 170   ;; Enable emacs mouse tracking in xterm.
 171   (if xterm-mouse-mode
 172       (send-string-to-terminal "\e[?1000h")))
 173
 174 (defun turn-off-xterm-mouse-tracking ()
 175   ;; Disable disable emacs mouse tracking in xterm.
 176   (if xterm-mouse-mode
 177       (send-string-to-terminal "\e[?1000l")))
 178
 179 ;; Restore normal mouse behaviour outside Emacs.
 180 (add-hook 'suspend-hook 'turn-off-xterm-mouse-tracking)
 181 (add-hook 'suspend-resume-hook 'turn-on-xterm-mouse-tracking)
 182 (add-hook 'kill-emacs-hook 'turn-off-xterm-mouse-tracking)
 183
 184 (provide 'xt-mouse)
 185
 186 ;;; xt-mouse.el ends here