--- /dev/null
+;;; xt-mouse.el --- Support the mouse when emacs run in an xterm.
+;; Copyright (C) 1994 Free Software Foundation
+
+;; Author: Per Abrahamsen <abraham@iesd.auc.dk>
+;; Keywords: mouse, terminals
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program; if not, write to the Free Software
+;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Comments:
+
+;; Enable mouse support when running inside an xterm.
+
+;; This is actually useful when you are running X11 locally, but is
+;; working on remote machine over a modem line or through a gateway.
+
+;; It works by translating xterm escape codes into generic emacs mouse
+;; events so it should work with any package that uses the mouse.
+
+;;; Todo:
+
+;; Support multi-click -- somehow.
+
+;; Clicking on the mode-line does not work, although it should.
+
+;;; Code:
+
+;; Emacs only generates down events when needed.
+;; This is too hard to emulate, so we cheat instead.
+(or (lookup-key global-map [ down-mouse-1 ])
+ (define-key global-map [ down-mouse-1 ] 'ignore))
+(or (lookup-key global-map [ down-mouse-2 ])
+ (define-key global-map [ down-mouse-2 ] 'ignore))
+(or (lookup-key global-map [ down-mouse-3 ])
+ (define-key global-map [ down-mouse-3 ] 'ignore))
+
+(define-key function-key-map "\e[M" 'xterm-mouse-translate)
+
+(defun xterm-mouse-translate (event)
+ ;; Read a click and release event from XTerm.
+ (save-excursion
+ (save-window-excursion
+ (deactivate-mark)
+ (let* ((last)
+ (down (xterm-mouse-event)))
+ (or (and (eq (read-char) ?\e)
+ (eq (read-char) ?\[)
+ (eq (read-char) ?M))
+ (error "Unexpected escape sequence from XTerm"))
+ (let ((click (xterm-mouse-event)))
+ (setq unread-command-events
+ (append unread-command-events
+ (if (eq (nth 1 (nth 1 down)) (nth 1 (nth 1 click)))
+ (list click)
+ (list
+ ;; Generate move event to cheat `mouse-drag-region'.
+ (list 'mouse-movement (nth 1 click))
+ ;; Generate a drag event.
+ (list (intern (concat "drag-mouse-" (+ 1 last)))
+ (nth 1 down) (nth 1 click)))))))
+ (vector down)))))
+
+(defun xterm-mouse-event ()
+ ;; Convert XTerm mouse event to Emacs mouse event.
+ (let* ((type (- (read-char) ? ))
+ (x (- (read-char) ? 1))
+ (y (- (read-char) ? 1))
+ (point (cons x y))
+ (window (window-at x y))
+ (where (coordinates-in-window-p point window))
+ (pos (if (consp where)
+ (progn
+ (select-window window)
+ (goto-char (window-start window))
+ (move-to-window-line (cdr where))
+ (move-to-column (+ (car where) (current-column)
+ (max 0 (1- (window-hscroll)))))
+ (point))
+ where))
+ (mouse (intern (if (eq type 3)
+ (concat "mouse-" (+ 1 last))
+ (setq last type)
+ (concat "down-mouse-" (+ 1 type))))))
+ (list mouse
+ (list window pos point
+ (/ (nth 2 (current-time)) 1000)))))
+
+;; Indicator for the xterm-mouse mode.
+(defvar xterm-mouse-mode nil)
+
+(or (assq 'xterm-mouse-mode minor-mode-alist)
+ (setq minor-mode-alist
+ (cons '(xterm-mouse-mode (" Mouse")) minor-mode-alist)))
+
+;;;###autoload
+(defun xterm-mouse-mode (arg)
+ "Toggle XTerm mouse mode.
+With prefix arg, turn XTerm mouse mode on iff arg is positive.
+
+Turn it on to use emacs mouse commands, and off to use xterm mouse commands."
+ (interactive "P")
+ (if (or (and (null arg) xterm-mouse-mode)
+ (<= (prefix-numeric-value arg) 0))
+ ;; Turn it off
+ (if xterm-mouse-mode
+ (progn
+ (turn-off-xterm-mouse-tracking)
+ (setq xterm-mouse-mode nil)
+ (set-buffer-modified-p (buffer-modified-p))))
+ ;;Turn it on
+ (if xterm-mouse-mode
+ ()
+ (setq xterm-mouse-mode t)
+ (turn-on-xterm-mouse-tracking)
+ (set-buffer-modified-p (buffer-modified-p)))))
+
+(defun turn-on-xterm-mouse-tracking ()
+ ;; Enable emacs mouse tracking in xterm.
+ (if xterm-mouse-mode
+ (send-string-to-terminal "\e[?1000h")))
+
+(defun turn-off-xterm-mouse-tracking ()
+ ;; Disable disable emacs mouse tracking in xterm.
+ (if xterm-mouse-mode
+ (send-string-to-terminal "\e[?1000l")))
+
+;; Restore normal mouse behaviour outside Emacs.
+(add-hook 'suspend-hook 'turn-off-xterm-mouse-tracking)
+(add-hook 'suspend-resume-hook 'turn-on-xterm-mouse-tracking)
+(add-hook 'kill-emacs-hook 'turn-off-xterm-mouse-tracking)
+
+(provide 'xt-mouse)
+
+;;; xt-mouse.el ends here