1 ;;; bg-mouse.el --- GNU Emacs code for BBN Bitgraph mouse.
3 ;; Copyright (C) Free Software Foundation, Inc. Oct 1985.
5 ;; Author: John Robinson <jr@bbn-unix.arpa>
6 ;; Stephen Gildea <gildea@bbn.com>
10 ;; This file is part of GNU Emacs.
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 2, or (at your option)
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.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs; see the file COPYING. If not, write to
24 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
28 ;;; Original version by John Robinson (jr@bbn-unix.arpa, bbncca!jr), Oct 1985
29 ;;; Modularized and enhanced by gildea@bbn.com Nov 1987
30 ;;; Time stamp <89/03/21 14:27:08 gildea>
32 ;;; User customization option:
34 (defvar bg-mouse-fast-select-window nil
35 "*Non-nil for mouse hits to select new window, then execute; else just select.")
37 ;;; These numbers are summed to make the index into the mouse-map.
38 ;;; The low three bits correspond to what the mouse actually sends.
39 (defconst bg-button-r 1)
40 (defconst bg-button-m 2)
41 (defconst bg-button-c 2)
42 (defconst bg-button-l 4)
43 (defconst bg-in-modeline 8)
44 (defconst bg-in-scrollbar 16)
45 (defconst bg-in-minibuf 24)
47 ;;; semicolon screws up indenting, so use this instead
48 (defconst semicolon ?\;)
52 (defun bg-mouse-report (prefix-arg)
53 "Read, parse, and execute a BBN BitGraph mouse click.
55 L-- move point | These apply for mouse click in a window.
56 --R set mark | If bg-mouse-fast-select-window is nil,
57 L-R kill region | these commands on a nonselected window
58 -C- move point and yank | just select that window.
60 -CR or LCR undo | \"Scroll bar\" is right-hand window column.
62 on modeline: on \"scroll bar\": in minibuffer:
63 L-- scroll-up line to top execute-extended-command
64 --R scroll-down line to bottom eval-expression
65 -C- proportional goto-char line to middle suspend-emacs
67 To reinitialize the mouse if the terminal is reset, type ESC : RET"
69 (bg-get-tty-num semicolon)
71 ((screen-mouse-x (min (1- (frame-width)) ;don't hit column 86!
72 (/ (bg-get-tty-num semicolon) 9)))
73 (screen-mouse-y (- (1- (frame-height)) ;assume default font size.
74 (/ (bg-get-tty-num semicolon) 16)))
75 (bg-mouse-buttons (% (bg-get-tty-num ?c) 8))
76 (bg-mouse-window (bg-window-from-x-y screen-mouse-x screen-mouse-y))
77 (bg-cursor-window (selected-window))
78 (edges (window-edges bg-mouse-window))
79 (minibuf-p (= screen-mouse-y (1- (screen-height))))
80 (in-modeline-p (and (not minibuf-p)
81 (= screen-mouse-y (1- (nth 3 edges)))))
82 (in-scrollbar-p (and (not minibuf-p) (not in-modeline-p)
83 (>= screen-mouse-x (1- (nth 2 edges)))))
84 (same-window-p (eq bg-mouse-window bg-cursor-window))
85 (in-minibuf-p (and minibuf-p
86 (not bg-mouse-window))) ;minibuf must be inactive
87 (bg-mode-bits (+ (if in-minibuf-p bg-in-minibuf 0)
88 (if in-modeline-p bg-in-modeline 0)
89 (if in-scrollbar-p bg-in-scrollbar 0)))
92 (char-to-string (+ bg-mode-bits bg-mouse-buttons))))
93 (bg-mouse-x (- screen-mouse-x (nth 0 edges)))
94 (bg-mouse-y (- screen-mouse-y (nth 1 edges))))
95 (cond ((or in-modeline-p in-scrollbar-p)
96 (select-window bg-mouse-window)
97 (bg-command-execute bg-command)
98 (select-window bg-cursor-window))
99 ((or same-window-p in-minibuf-p)
100 (bg-command-execute bg-command))
101 (t ;in another window
102 (select-window bg-mouse-window)
103 (if bg-mouse-fast-select-window
104 (bg-command-execute bg-command)))
108 ;;; Library of commands:
110 (defun bg-set-point ()
111 "Move point to location of BitGraph mouse."
113 (bg-move-point-to-x-y bg-mouse-x bg-mouse-y)
114 (setq this-command 'next-line) ;make subsequent line moves work
115 (setq temporary-goal-column bg-mouse-x))
117 (defun bg-set-mark ()
118 "Set mark at location of BitGraph mouse."
121 (bg-move-point-to-x-y bg-mouse-x bg-mouse-y)
122 (exchange-point-and-mark))
125 "Move point to location of BitGraph mouse and yank."
127 (bg-move-point-to-x-y bg-mouse-x bg-mouse-y)
128 (setq this-command 'yank)
135 (defun bg-yank-or-pop ()
136 "Move point to location of BitGraph mouse and yank. If last command
137 was a yank, do a yank-pop."
139 (if (eql last-command 'yank)
143 ;;; In 18.51, Emacs Lisp doesn't provide most-positive-fixnum
144 (defconst bg-most-positive-fixnum 8388607)
146 (defun bg-move-by-percentage ()
147 "Go to location in buffer that is the same percentage of the way
148 through the buffer as the BitGraph mouse's X position in the window."
150 ;; check carefully for overflow in intermediate calculations
152 (cond ((zerop bg-mouse-x)
154 ((< (buffer-size) (/ bg-most-positive-fixnum bg-mouse-x))
155 ;; no danger of overflow: compute it exactly
156 (/ (* bg-mouse-x (buffer-size))
157 (1- (window-width))))
159 ;; overflow possible: approximate
160 (* (/ (buffer-size) (1- (window-width)))
163 (what-cursor-position))
165 (defun bg-mouse-line-to-top ()
166 "Scroll the line pointed to by the BitGraph mouse to the top of the window."
168 (scroll-up bg-mouse-y))
170 (defun bg-mouse-line-to-center ()
171 "Scroll the line pointed to by the BitGraph mouse to the center
174 (scroll-up (/ (+ 2 bg-mouse-y bg-mouse-y (- (window-height))) 2)))
176 (defun bg-mouse-line-to-bottom ()
177 "Scroll the line pointed to by the mouse to the bottom of the window."
179 (scroll-up (+ bg-mouse-y (- 2 (window-height)))))
181 (defun bg-kill-region ()
183 (kill-region (region-beginning) (region-end)))
185 (defun bg-insert-moused-sexp ()
186 "Insert a copy of the word (actually sexp) that the mouse is pointing at.
187 Sexp is inserted into the buffer at point (where the text cursor is)."
191 (bg-move-point-to-x-y bg-mouse-x bg-mouse-y)
192 (if (looking-at "\\s)")
195 (buffer-substring (save-excursion (backward-sexp 1) (point))
197 (select-window bg-cursor-window)
198 (delete-horizontal-space)
201 (indent-according-to-mode))
202 ;; In Lisp assume double-quote is closing; in Text assume opening.
203 ;; Why? Because it does the right thing most often.
204 ((save-excursion (backward-char 1)
205 (and (not (looking-at "\\s\""))
206 (looking-at "[`'\"\\]\\|\\s(")))
209 (insert-string " ")))
210 (insert-string moused-text)
212 (looking-at "\\s.\\|\\s)")
213 (and (looking-at "'") (looking-at "\\sw")) ;hack for text mode
214 (save-excursion (insert-string " ")))))
216 ;;; Utility functions:
218 (defun bg-get-tty-num (term-char)
219 "Read from terminal until TERM-CHAR is read, and return intervening number.
220 If non-numeric not matching TERM-CHAR, reprogram the mouse and signal an error."
223 (char (- (read-char) 48)))
224 (while (and (>= char 0)
226 (setq num (+ (* num 10) char))
227 (setq char (- (read-char) 48)))
228 (or (eq term-char (+ char 48))
232 "Invalid data format in bg-mouse command: mouse reinitialized.")))
235 ;;; Note that this fails in the minibuf because move-to-column doesn't
236 ;;; allow for the width of the prompt.
237 (defun bg-move-point-to-x-y (x y)
238 "Position cursor in window coordinates.
239 X and Y are 0-based character positions in the window."
240 (move-to-window-line y)
241 ;; if not on a wrapped line, zero-column will be 0
242 (let ((zero-column (current-column))
243 (scroll-offset (window-hscroll)))
244 ;; scrolling takes up column 0 to display the $
245 (if (> scroll-offset 0)
246 (setq scroll-offset (1- scroll-offset)))
247 (move-to-column (+ zero-column scroll-offset x))
250 ;;; Returns the window that screen position (x, y) is in or nil if none,
251 ;;; meaning we are in the echo area with a non-active minibuffer.
252 ;;; If coordinates-in-window-p were not in an X-windows-specific file
253 ;;; we could use that. In Emacs 19 can even use locate-window-from-coordinates
254 (defun bg-window-from-x-y (x y)
255 "Find window corresponding to screen coordinates.
256 X and Y are 0-based character positions on the screen."
257 (let ((edges (window-edges))
259 (while (and (not (eq window (selected-window)))
260 (or (< y (nth 1 edges))
263 (>= x (nth 2 edges))))
264 (setq window (next-window window))
265 (setq edges (window-edges window)))
266 (cond ((eq window (selected-window))
267 nil) ;we've looped: not found
269 (selected-window)) ;just starting: current window
274 (defun bg-command-execute (bg-command)
275 (if (commandp bg-command)
276 (command-execute bg-command)
279 (defun bg-program-mouse ()
280 (send-string-to-terminal "\e:0;7;;;360;512;9;16;9;16c"))
282 ;;; Note that the doc string for mouse-map (as defined in subr.el)
283 ;;; says it is for the X-window mouse. This is wrong; that keymap
284 ;;; should be used for your mouse no matter what terminal you have.
286 (or (keymapp mouse-map)
287 (setq mouse-map (make-keymap)))
289 (defun bind-bg-mouse-click (click-code function)
290 "Bind bg-mouse CLICK-CODE to run FUNCTION."
291 (define-key mouse-map (char-to-string click-code) function))
293 (bind-bg-mouse-click bg-button-l 'bg-set-point)
294 (bind-bg-mouse-click bg-button-m 'bg-yank)
295 (bind-bg-mouse-click bg-button-r 'bg-set-mark)
296 (bind-bg-mouse-click (+ bg-button-l bg-button-m) 'yank-pop-1)
297 (bind-bg-mouse-click (+ bg-button-l bg-button-r) 'bg-kill-region)
298 (bind-bg-mouse-click (+ bg-button-m bg-button-r) 'undo)
299 (bind-bg-mouse-click (+ bg-button-l bg-button-m bg-button-r) 'undo)
300 (bind-bg-mouse-click (+ bg-in-modeline bg-button-l) 'scroll-up)
301 (bind-bg-mouse-click (+ bg-in-modeline bg-button-m) 'bg-move-by-percentage)
302 (bind-bg-mouse-click (+ bg-in-modeline bg-button-r) 'scroll-down)
303 (bind-bg-mouse-click (+ bg-in-scrollbar bg-button-l) 'bg-mouse-line-to-top)
304 (bind-bg-mouse-click (+ bg-in-scrollbar bg-button-m) 'bg-mouse-line-to-center)
305 (bind-bg-mouse-click (+ bg-in-scrollbar bg-button-r) 'bg-mouse-line-to-bottom)
306 (bind-bg-mouse-click (+ bg-in-minibuf bg-button-l) 'execute-extended-command)
307 (bind-bg-mouse-click (+ bg-in-minibuf bg-button-m) 'suspend-emacs)
308 (bind-bg-mouse-click (+ bg-in-minibuf bg-button-r) 'eval-expression)
312 ;;; bg-mouse.el ends here