| 1 | ;;; xt-mouse.el --- support the mouse when emacs run in an xterm |
| 2 | |
| 3 | ;; Copyright (C) 1994, 2000-2011 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: Per Abrahamsen <abraham@dina.kvl.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 3 of the License, or |
| 13 | ;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>. |
| 22 | |
| 23 | ;;; Commentary: |
| 24 | |
| 25 | ;; Enable mouse support when running inside an xterm. |
| 26 | |
| 27 | ;; This is actually useful when you are running X11 locally, but is |
| 28 | ;; working on remote machine over a modem line or through a gateway. |
| 29 | |
| 30 | ;; It works by translating xterm escape codes into generic emacs mouse |
| 31 | ;; events so it should work with any package that uses the mouse. |
| 32 | |
| 33 | ;; You don't have to turn off xterm mode to use the normal xterm mouse |
| 34 | ;; functionality, it is still available by holding down the SHIFT key |
| 35 | ;; when you press the mouse button. |
| 36 | |
| 37 | ;;; Todo: |
| 38 | |
| 39 | ;; Support multi-click -- somehow. |
| 40 | |
| 41 | ;;; Code: |
| 42 | |
| 43 | (defvar xterm-mouse-debug-buffer nil) |
| 44 | |
| 45 | (defvar xterm-mouse-last) |
| 46 | |
| 47 | ;; Mouse events symbols must have an 'event-kind property with |
| 48 | ;; the value 'mouse-click. |
| 49 | (dolist (event-type '(mouse-1 mouse-2 mouse-3 |
| 50 | M-down-mouse-1 M-down-mouse-2 M-down-mouse-3)) |
| 51 | (put event-type 'event-kind 'mouse-click)) |
| 52 | |
| 53 | (defun xterm-mouse-translate (_event) |
| 54 | "Read a click and release event from XTerm." |
| 55 | (save-excursion |
| 56 | (save-window-excursion |
| 57 | (deactivate-mark) |
| 58 | (let* ((xterm-mouse-last) |
| 59 | (down (xterm-mouse-event)) |
| 60 | (down-command (nth 0 down)) |
| 61 | (down-data (nth 1 down)) |
| 62 | (down-where (nth 1 down-data)) |
| 63 | (down-binding (key-binding (if (symbolp down-where) |
| 64 | (vector down-where down-command) |
| 65 | (vector down-command)))) |
| 66 | (is-click (string-match "^mouse" (symbol-name (car down))))) |
| 67 | |
| 68 | (unless is-click |
| 69 | (unless (and (eq (read-char) ?\e) |
| 70 | (eq (read-char) ?\[) |
| 71 | (eq (read-char) ?M)) |
| 72 | (error "Unexpected escape sequence from XTerm"))) |
| 73 | |
| 74 | (let* ((click (if is-click down (xterm-mouse-event))) |
| 75 | ;; (click-command (nth 0 click)) |
| 76 | (click-data (nth 1 click)) |
| 77 | (click-where (nth 1 click-data))) |
| 78 | (if (memq down-binding '(nil ignore)) |
| 79 | (if (and (symbolp click-where) |
| 80 | (consp click-where)) |
| 81 | (vector (list click-where click-data) click) |
| 82 | (vector click)) |
| 83 | (setq unread-command-events |
| 84 | (if (eq down-where click-where) |
| 85 | (list click) |
| 86 | (list |
| 87 | ;; Cheat `mouse-drag-region' with move event. |
| 88 | (list 'mouse-movement click-data) |
| 89 | ;; Generate a drag event. |
| 90 | (if (symbolp down-where) |
| 91 | 0 |
| 92 | (list (intern (format "drag-mouse-%d" |
| 93 | (+ 1 xterm-mouse-last))) |
| 94 | down-data click-data))))) |
| 95 | (if xterm-mouse-debug-buffer |
| 96 | (print unread-command-events xterm-mouse-debug-buffer)) |
| 97 | (if (and (symbolp down-where) |
| 98 | (consp down-where)) |
| 99 | (vector (list down-where down-data) down) |
| 100 | (vector down)))))))) |
| 101 | |
| 102 | ;; These two variables have been converted to terminal parameters. |
| 103 | ;; |
| 104 | ;;(defvar xterm-mouse-x 0 |
| 105 | ;; "Position of last xterm mouse event relative to the frame.") |
| 106 | ;; |
| 107 | ;;(defvar xterm-mouse-y 0 |
| 108 | ;; "Position of last xterm mouse event relative to the frame.") |
| 109 | |
| 110 | (defvar xt-mouse-epoch nil) |
| 111 | |
| 112 | ;; Indicator for the xterm-mouse mode. |
| 113 | |
| 114 | (defun xterm-mouse-position-function (pos) |
| 115 | "Bound to `mouse-position-function' in XTerm mouse mode." |
| 116 | (when (terminal-parameter nil 'xterm-mouse-x) |
| 117 | (setcdr pos (cons (terminal-parameter nil 'xterm-mouse-x) |
| 118 | (terminal-parameter nil 'xterm-mouse-y)))) |
| 119 | pos) |
| 120 | |
| 121 | ;; read xterm sequences above ascii 127 (#x7f) |
| 122 | (defun xterm-mouse-event-read () |
| 123 | ;; We get the characters decoded by the keyboard coding system. Try |
| 124 | ;; to recover the raw character. |
| 125 | (let ((c (read-char))) |
| 126 | (cond ;; If meta-flag is t we get a meta character |
| 127 | ((>= c ?\M-\^@) |
| 128 | (- c (- ?\M-\^@ 128))) |
| 129 | ;; Reencode the character in the keyboard coding system, if |
| 130 | ;; this is a non-ASCII character. |
| 131 | ((>= c #x80) |
| 132 | (aref (encode-coding-string (string c) (keyboard-coding-system)) 0)) |
| 133 | (t c)))) |
| 134 | |
| 135 | (defun xterm-mouse-truncate-wrap (f) |
| 136 | "Truncate with wrap-around." |
| 137 | (condition-case nil |
| 138 | ;; First try the built-in truncate, in case there's no overflow. |
| 139 | (truncate f) |
| 140 | ;; In case of overflow, do wraparound by hand. |
| 141 | (range-error |
| 142 | ;; In our case, we wrap around every 3 days or so, so if we assume |
| 143 | ;; a maximum of 65536 wraparounds, we're safe for a couple years. |
| 144 | ;; Using a power of 2 makes rounding errors less likely. |
| 145 | (let* ((maxwrap (* 65536 2048)) |
| 146 | (dbig (truncate (/ f maxwrap))) |
| 147 | (fdiff (- f (* 1.0 maxwrap dbig)))) |
| 148 | (+ (truncate fdiff) (* maxwrap dbig)))))) |
| 149 | |
| 150 | (defun xterm-mouse-event () |
| 151 | "Convert XTerm mouse event to Emacs mouse event." |
| 152 | (let* ((type (- (xterm-mouse-event-read) #o40)) |
| 153 | (x (- (xterm-mouse-event-read) #o40 1)) |
| 154 | (y (- (xterm-mouse-event-read) #o40 1)) |
| 155 | ;; Emulate timestamp information. This is accurate enough |
| 156 | ;; for default value of mouse-1-click-follows-link (450msec). |
| 157 | (timestamp (xterm-mouse-truncate-wrap |
| 158 | (* 1000 |
| 159 | (- (float-time) |
| 160 | (or xt-mouse-epoch |
| 161 | (setq xt-mouse-epoch (float-time))))))) |
| 162 | (mouse (intern |
| 163 | ;; For buttons > 3, the release-event looks |
| 164 | ;; differently (see xc/programs/xterm/button.c, |
| 165 | ;; function EditorButton), and there seems to come in |
| 166 | ;; a release-event only, no down-event. |
| 167 | (cond ((>= type 64) |
| 168 | (format "mouse-%d" (- type 60))) |
| 169 | ((memq type '(8 9 10)) |
| 170 | (setq xterm-mouse-last type) |
| 171 | (format "M-down-mouse-%d" (- type 7))) |
| 172 | ((= type 11) |
| 173 | (format "mouse-%d" (- xterm-mouse-last 7))) |
| 174 | ((= type 3) |
| 175 | ;; For buttons > 5 xterm only reports a |
| 176 | ;; button-release event. Avoid error by mapping |
| 177 | ;; them all to mouse-1. |
| 178 | (format "mouse-%d" (+ 1 (or xterm-mouse-last 0)))) |
| 179 | (t |
| 180 | (setq xterm-mouse-last type) |
| 181 | (format "down-mouse-%d" (+ 1 type)))))) |
| 182 | (w (window-at x y)) |
| 183 | (ltrb (window-edges w)) |
| 184 | (left (nth 0 ltrb)) |
| 185 | (top (nth 1 ltrb))) |
| 186 | |
| 187 | (set-terminal-parameter nil 'xterm-mouse-x x) |
| 188 | (set-terminal-parameter nil 'xterm-mouse-y y) |
| 189 | (setq |
| 190 | last-input-event |
| 191 | (list mouse |
| 192 | (let ((event (if w |
| 193 | (posn-at-x-y (- x left) (- y top) w t) |
| 194 | (append (list nil 'menu-bar) |
| 195 | (nthcdr 2 (posn-at-x-y x y)))))) |
| 196 | (setcar (nthcdr 3 event) timestamp) |
| 197 | event))))) |
| 198 | |
| 199 | ;;;###autoload |
| 200 | (define-minor-mode xterm-mouse-mode |
| 201 | "Toggle XTerm mouse mode. |
| 202 | With a prefix argument ARG, enable XTerm mouse mode if ARG is |
| 203 | positive, and disable it otherwise. If called from Lisp, enable |
| 204 | the mode if ARG is omitted or nil. |
| 205 | |
| 206 | Turn it on to use Emacs mouse commands, and off to use xterm mouse commands. |
| 207 | This works in terminal emulators compatible with xterm. It only |
| 208 | works for simple uses of the mouse. Basically, only non-modified |
| 209 | single clicks are supported. When turned on, the normal xterm |
| 210 | mouse functionality for such clicks is still available by holding |
| 211 | down the SHIFT key while pressing the mouse button." |
| 212 | :global t :group 'mouse |
| 213 | (let ((do-hook (if xterm-mouse-mode 'add-hook 'remove-hook))) |
| 214 | (funcall do-hook 'terminal-init-xterm-hook |
| 215 | 'turn-on-xterm-mouse-tracking-on-terminal) |
| 216 | (funcall do-hook 'delete-terminal-functions |
| 217 | 'turn-off-xterm-mouse-tracking-on-terminal) |
| 218 | (funcall do-hook 'suspend-tty-functions |
| 219 | 'turn-off-xterm-mouse-tracking-on-terminal) |
| 220 | (funcall do-hook 'resume-tty-functions |
| 221 | 'turn-on-xterm-mouse-tracking-on-terminal) |
| 222 | (funcall do-hook 'suspend-hook 'turn-off-xterm-mouse-tracking) |
| 223 | (funcall do-hook 'suspend-resume-hook 'turn-on-xterm-mouse-tracking) |
| 224 | (funcall do-hook 'kill-emacs-hook 'turn-off-xterm-mouse-tracking)) |
| 225 | (if xterm-mouse-mode |
| 226 | ;; Turn it on |
| 227 | (progn |
| 228 | (setq mouse-position-function #'xterm-mouse-position-function) |
| 229 | (turn-on-xterm-mouse-tracking)) |
| 230 | ;; Turn it off |
| 231 | (turn-off-xterm-mouse-tracking 'force) |
| 232 | (setq mouse-position-function nil))) |
| 233 | |
| 234 | (defun turn-on-xterm-mouse-tracking () |
| 235 | "Enable Emacs mouse tracking in xterm." |
| 236 | (dolist (terminal (terminal-list)) |
| 237 | (turn-on-xterm-mouse-tracking-on-terminal terminal))) |
| 238 | |
| 239 | (defun turn-off-xterm-mouse-tracking (&optional _force) |
| 240 | "Disable Emacs mouse tracking in xterm." |
| 241 | (dolist (terminal (terminal-list)) |
| 242 | (turn-off-xterm-mouse-tracking-on-terminal terminal))) |
| 243 | |
| 244 | (defun turn-on-xterm-mouse-tracking-on-terminal (&optional terminal) |
| 245 | "Enable xterm mouse tracking on TERMINAL." |
| 246 | (when (and xterm-mouse-mode (eq t (terminal-live-p terminal)) |
| 247 | ;; Avoid the initial terminal which is not a termcap device. |
| 248 | ;; FIXME: is there more elegant way to detect the initial terminal? |
| 249 | (not (string= (terminal-name terminal) "initial_terminal"))) |
| 250 | (unless (terminal-parameter terminal 'xterm-mouse-mode) |
| 251 | ;; Simulate selecting a terminal by selecting one of its frames ;-( |
| 252 | (with-selected-frame (car (frames-on-display-list terminal)) |
| 253 | (define-key input-decode-map "\e[M" 'xterm-mouse-translate)) |
| 254 | (set-terminal-parameter terminal 'xterm-mouse-mode t)) |
| 255 | (send-string-to-terminal "\e[?1000h" terminal))) |
| 256 | |
| 257 | (defun turn-off-xterm-mouse-tracking-on-terminal (terminal) |
| 258 | "Disable xterm mouse tracking on TERMINAL." |
| 259 | ;; Only send the disable command to those terminals to which we've already |
| 260 | ;; sent the enable command. |
| 261 | (when (and (terminal-parameter terminal 'xterm-mouse-mode) |
| 262 | (eq t (terminal-live-p terminal)) |
| 263 | ;; Avoid the initial terminal which is not a termcap device. |
| 264 | ;; FIXME: is there more elegant way to detect the initial terminal? |
| 265 | (not (string= (terminal-name terminal) "initial_terminal"))) |
| 266 | ;; We could remove the key-binding and unset the `xterm-mouse-mode' |
| 267 | ;; terminal parameter, but it seems less harmful to send this escape |
| 268 | ;; command too many times (or to catch an unintended key sequence), than |
| 269 | ;; to send it too few times (or to fail to let xterm-mouse events |
| 270 | ;; pass by untranslated). |
| 271 | (send-string-to-terminal "\e[?1000l" terminal))) |
| 272 | |
| 273 | (provide 'xt-mouse) |
| 274 | |
| 275 | ;;; xt-mouse.el ends here |