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Richard M. Stallman
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145
lisp/xt-mouse.el
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145
lisp/xt-mouse.el
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;;; xt-mouse.el --- Support the mouse when emacs run in an xterm.
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;; Copyright (C) 1994 Free Software Foundation
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;; Author: Per Abrahamsen <abraham@iesd.auc.dk>
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;; Keywords: mouse, terminals
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, write to the Free Software
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;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Comments:
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;; Enable mouse support when running inside an xterm.
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;; This is actually useful when you are running X11 locally, but is
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;; working on remote machine over a modem line or through a gateway.
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;; It works by translating xterm escape codes into generic emacs mouse
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;; events so it should work with any package that uses the mouse.
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;;; Todo:
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;; Support multi-click -- somehow.
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;; Clicking on the mode-line does not work, although it should.
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;;; Code:
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;; Emacs only generates down events when needed.
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;; This is too hard to emulate, so we cheat instead.
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(or (lookup-key global-map [ down-mouse-1 ])
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(define-key global-map [ down-mouse-1 ] 'ignore))
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(or (lookup-key global-map [ down-mouse-2 ])
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(define-key global-map [ down-mouse-2 ] 'ignore))
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(or (lookup-key global-map [ down-mouse-3 ])
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(define-key global-map [ down-mouse-3 ] 'ignore))
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(define-key function-key-map "\e[M" 'xterm-mouse-translate)
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(defun xterm-mouse-translate (event)
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;; Read a click and release event from XTerm.
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(save-excursion
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(save-window-excursion
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(deactivate-mark)
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(let* ((last)
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(down (xterm-mouse-event)))
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(or (and (eq (read-char) ?\e)
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(eq (read-char) ?\[)
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(eq (read-char) ?M))
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(error "Unexpected escape sequence from XTerm"))
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(let ((click (xterm-mouse-event)))
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(setq unread-command-events
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(append unread-command-events
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(if (eq (nth 1 (nth 1 down)) (nth 1 (nth 1 click)))
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(list click)
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(list
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;; Generate move event to cheat `mouse-drag-region'.
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(list 'mouse-movement (nth 1 click))
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;; Generate a drag event.
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(list (intern (concat "drag-mouse-" (+ 1 last)))
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(nth 1 down) (nth 1 click)))))))
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(vector down)))))
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(defun xterm-mouse-event ()
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;; Convert XTerm mouse event to Emacs mouse event.
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(let* ((type (- (read-char) ? ))
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(x (- (read-char) ? 1))
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(y (- (read-char) ? 1))
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(point (cons x y))
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(window (window-at x y))
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(where (coordinates-in-window-p point window))
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(pos (if (consp where)
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(progn
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(select-window window)
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(goto-char (window-start window))
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(move-to-window-line (cdr where))
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(move-to-column (+ (car where) (current-column)
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(max 0 (1- (window-hscroll)))))
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(point))
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where))
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(mouse (intern (if (eq type 3)
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(concat "mouse-" (+ 1 last))
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(setq last type)
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(concat "down-mouse-" (+ 1 type))))))
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(list mouse
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(list window pos point
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(/ (nth 2 (current-time)) 1000)))))
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;; Indicator for the xterm-mouse mode.
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(defvar xterm-mouse-mode nil)
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(or (assq 'xterm-mouse-mode minor-mode-alist)
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(setq minor-mode-alist
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(cons '(xterm-mouse-mode (" Mouse")) minor-mode-alist)))
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;;;###autoload
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(defun xterm-mouse-mode (arg)
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"Toggle XTerm mouse mode.
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With prefix arg, turn XTerm mouse mode on iff arg is positive.
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Turn it on to use emacs mouse commands, and off to use xterm mouse commands."
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(interactive "P")
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(if (or (and (null arg) xterm-mouse-mode)
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(<= (prefix-numeric-value arg) 0))
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;; Turn it off
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(if xterm-mouse-mode
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(progn
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(turn-off-xterm-mouse-tracking)
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(setq xterm-mouse-mode nil)
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(set-buffer-modified-p (buffer-modified-p))))
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;;Turn it on
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(if xterm-mouse-mode
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()
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(setq xterm-mouse-mode t)
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(turn-on-xterm-mouse-tracking)
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(set-buffer-modified-p (buffer-modified-p)))))
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(defun turn-on-xterm-mouse-tracking ()
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;; Enable emacs mouse tracking in xterm.
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(if xterm-mouse-mode
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(send-string-to-terminal "\e[?1000h")))
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(defun turn-off-xterm-mouse-tracking ()
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;; Disable disable emacs mouse tracking in xterm.
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(if xterm-mouse-mode
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(send-string-to-terminal "\e[?1000l")))
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;; Restore normal mouse behaviour outside Emacs.
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(add-hook 'suspend-hook 'turn-off-xterm-mouse-tracking)
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(add-hook 'suspend-resume-hook 'turn-on-xterm-mouse-tracking)
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(add-hook 'kill-emacs-hook 'turn-off-xterm-mouse-tracking)
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(provide 'xt-mouse)
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;;; xt-mouse.el ends here
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