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[emacs.git] / lisp / mouse-sel.el
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1 ;;; mouse-sel.el --- Multi-click selection support for Emacs 19
3 ;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
5 ;; Author: Mike Williams <mikew@gopher.dosli.govt.nz>
6 ;; Keywords: mouse
8 ;; This file is part of GNU Emacs.
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.
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.
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.
25 ;;; Commentary:
27 ;; This module provides multi-click mouse support for GNU Emacs versions
28 ;; 19.18 and later. I've tried to make it behave more like standard X
29 ;; clients (eg. xterm) than the default Emacs 19 mouse selection handlers.
30 ;; Basically:
32 ;; * Clicking mouse-1 starts (cancels) selection, dragging extends it.
34 ;; * Clicking or dragging mouse-3 extends the selection as well.
36 ;; * Double-clicking on word constituents selects words.
37 ;; Double-clicking on symbol constituents selects symbols.
38 ;; Double-clicking on quotes or parentheses selects sexps.
39 ;; Double-clicking on whitespace selects whitespace.
40 ;; Triple-clicking selects lines.
41 ;; Quad-clicking selects paragraphs.
43 ;; * Selecting sets the region & X primary selection, but does NOT affect
44 ;; the kill-ring. Because the mouse handlers set the primary selection
45 ;; directly, mouse-sel sets the variables interprogram-cut-function
46 ;; and interprogram-paste-function to nil.
48 ;; * Clicking mouse-2 inserts the contents of the primary selection at
49 ;; the mouse position (or point, if mouse-yank-at-point is non-nil).
51 ;; * Pressing mouse-2 while selecting or extending copies selection
52 ;; to the kill ring. Pressing mouse-1 or mouse-3 kills it.
53 ;;
54 ;; * Double-clicking mouse-3 also kills selection.
55 ;;
56 ;; * M-mouse-1, M-mouse-2 & M-mouse-3 work similarly to mouse-1, mouse-2
57 ;; & mouse-3, but operate on the X secondary selection rather than the
58 ;; primary selection and region.
60 ;; This module requires my thingatpt.el module, which it uses to find the
61 ;; bounds of words, lines, sexps, etc.
63 ;; Thanks to KevinB@bartley.demon.co.uk for his useful input.
65 ;;--- Customisation -------------------------------------------------------
67 ;; * You may want to use none or more of following:
69 ;; ;; Enable region highlight
70 ;; (transient-mark-mode 1)
72 ;; ;; But only in the selected window
73 ;; (setq highlight-nonselected-windows nil)
74 ;;
75 ;; ;; Enable pending-delete
76 ;; (delete-selection-mode 1)
78 ;; * You can control the way mouse-sel binds its keys by setting the value
79 ;; of mouse-sel-default-bindings before loading mouse-sel.
81 ;; (a) If mouse-sel-default-bindings = t (the default)
82 ;;
83 ;; Mouse sets and insert selection
84 ;; mouse-1 mouse-select
85 ;; mouse-2 mouse-insert-selection
86 ;; mouse-3 mouse-extend
88 ;; Selection/kill-ring interaction is disabled
89 ;; interprogram-cut-function = nil
90 ;; interprogram-paste-function = nil
92 ;; (b) If mouse-sel-default-bindings = 'interprogram-cut-paste
93 ;;
94 ;; Mouse sets selection, and pastes from kill-ring
95 ;; mouse-1 mouse-select
96 ;; mouse-2 mouse-yank-at-click
97 ;; mouse-3 mouse-extend
98 ;;
99 ;; Selection/kill-ring interaction is retained
100 ;; interprogram-cut-function = x-select-text
101 ;; interprogram-paste-function = x-cut-buffer-or-selection-value
103 ;; What you lose is the ability to select some text in
104 ;; delete-selection-mode and yank over the top of it.
106 ;; (c) If mouse-sel-default-bindings = nil, no bindings are made.
108 ;; * By default, mouse-insert-selection (mouse-2) inserts the selection at
109 ;; the mouse position. You can tell it to insert at point instead with:
111 ;; (setq mouse-yank-at-point t)
113 ;; * I like to leave point at the end of the region nearest to where the
114 ;; mouse was, even though this makes region highlighting mis-leading (the
115 ;; cursor makes it look like one extra character is selected). You can
116 ;; disable this behaviour with:
118 ;; (setq mouse-sel-leave-point-near-mouse nil)
120 ;; * By default, mouse-select cycles the click count after 4 clicks. That
121 ;; is, clicking mouse-1 five times has the same effect as clicking it
122 ;; once, clicking six times has the same effect as clicking twice, etc.
123 ;; Disable this behaviour with:
125 ;; (setq mouse-sel-cycle-clicks nil)
127 ;; * The variables mouse-sel-{set,get}-selection-function control how the
128 ;; selection is handled. Under X Windows, these variables default so
129 ;; that the X primary selection is used. Under other windowing systems,
130 ;; alternate functions are used, which simply store the selection value
131 ;; in a variable.
133 ;; * You can change the selection highlight face by altering the properties
134 ;; of mouse-drag-overlay, eg.
136 ;; (overlay-put mouse-drag-overlay 'face 'bold)
138 ;;; Code:
140 (require 'mouse)
141 (require 'thingatpt)
143 (eval-when-compile
144 (require 'cl))
146 ;;=== User Variables ======================================================
148 (defgroup mouse-sel nil
149 "Mouse selection enhancement."
150 :group 'mouse)
152 (defcustom mouse-sel-mode nil
153 "Toggle Mouse Sel mode.
154 When Mouse Sel mode is enabled, mouse selection is enhanced in various ways.
155 Setting this variable directly does not take effect;
156 use either \\[customize] or the function `mouse-sel-mode'."
157 :set (lambda (symbol value)
158 (mouse-sel-mode (or value 0)))
159 :initialize 'custom-initialize-default
160 :type 'boolean
161 :group 'mouse-sel
162 :require 'mouse-sel)
164 (defcustom mouse-sel-leave-point-near-mouse t
165 "*Leave point near last mouse position.
166 If non-nil, \\[mouse-select] and \\[mouse-extend] will leave point at the end
167 of the region nearest to where the mouse last was.
168 If nil, point will always be placed at the beginning of the region."
169 :type 'boolean
170 :group 'mouse-sel)
172 (defcustom mouse-sel-cycle-clicks t
173 "*If non-nil, \\[mouse-select] cycles the click-counts after 4 clicks."
174 :type 'boolean
175 :group 'mouse-sel)
177 (defcustom mouse-sel-default-bindings t
178 "*Control mouse bindings."
179 :type '(choice (const :tag "none" nil)
180 (const :tag "cut and paste" interprogram-cut-paste)
181 (other :tag "default bindings" t))
182 :group 'mouse-sel)
184 ;;=== User Command ========================================================
186 ;;;###autoload
187 (defun mouse-sel-mode (&optional arg)
188 "Toggle Mouse Sel mode.
189 With prefix ARG, turn Mouse Sel mode on if and only if ARG is positive.
190 Returns the new status of Mouse Sel mode (non-nil means on).
192 When Mouse Sel mode is enabled, mouse selection is enhanced in various ways:
194 - Clicking mouse-1 starts (cancels) selection, dragging extends it.
196 - Clicking or dragging mouse-3 extends the selection as well.
198 - Double-clicking on word constituents selects words.
199 Double-clicking on symbol constituents selects symbols.
200 Double-clicking on quotes or parentheses selects sexps.
201 Double-clicking on whitespace selects whitespace.
202 Triple-clicking selects lines.
203 Quad-clicking selects paragraphs.
205 - Selecting sets the region & X primary selection, but does NOT affect
206 the kill-ring, nor do the kill-ring function change the X selection.
207 Because the mouse handlers set the primary selection directly,
208 mouse-sel sets the variables interprogram-cut-function and
209 interprogram-paste-function to nil.
211 - Clicking mouse-2 inserts the contents of the primary selection at
212 the mouse position (or point, if mouse-yank-at-point is non-nil).
214 - Pressing mouse-2 while selecting or extending copies selection
215 to the kill ring. Pressing mouse-1 or mouse-3 kills it.
217 - Double-clicking mouse-3 also kills selection.
219 - M-mouse-1, M-mouse-2 & M-mouse-3 work similarly to mouse-1, mouse-2
220 & mouse-3, but operate on the X secondary selection rather than the
221 primary selection and region."
222 (interactive "P")
223 (let ((on-p (if arg
224 (> (prefix-numeric-value arg) 0)
225 (not mouse-sel-mode))))
226 (if on-p
227 (add-hook 'x-lost-selection-hooks 'mouse-sel-lost-selection-hook)
228 (remove-hook 'x-lost-selection-hooks 'mouse-sel-lost-selection-hook))
229 (mouse-sel-bindings on-p)
230 (setq mouse-sel-mode on-p)))
232 ;;=== Key bindings ========================================================
234 (defun mouse-sel-bindings (bind)
235 (cond ((not bind)
236 ;; These bindings are taken from mouse.el, i.e., they are the default
237 ;; bindings. It would be better to restore the previous bindings.
238 ;; Primary selection bindings.
239 (global-set-key [mouse-1] 'mouse-set-point)
240 (global-set-key [mouse-2] 'mouse-yank-at-click)
241 (global-set-key [mouse-3] 'mouse-save-then-kill)
242 (global-set-key [down-mouse-1] 'mouse-drag-region)
243 (global-set-key [drag-mouse-1] 'mouse-set-region)
244 (global-set-key [double-mouse-1] 'mouse-set-point)
245 (global-set-key [triple-mouse-1] 'mouse-set-point)
246 ;; Secondary selection bindings.
247 (global-set-key [M-mouse-1] 'mouse-start-secondary)
248 (global-set-key [M-mouse-2] 'mouse-yank-secondary)
249 (global-set-key [M-mouse-3] 'mouse-secondary-save-then-kill)
250 (global-set-key [M-drag-mouse-1] 'mouse-set-secondary)
251 (global-set-key [M-down-mouse-1] 'mouse-drag-secondary))
252 (mouse-sel-default-bindings
254 ;; Primary selection bindings.
255 (global-unset-key [mouse-1])
256 (global-unset-key [drag-mouse-1])
257 (global-unset-key [mouse-3])
258 (global-set-key [down-mouse-1] 'mouse-select)
259 (unless (eq mouse-sel-default-bindings 'interprogram-cut-paste)
260 (global-set-key [mouse-2] 'mouse-insert-selection)
261 (setq interprogram-cut-function nil
262 interprogram-paste-function nil))
263 (global-set-key [down-mouse-3] 'mouse-extend)
265 ;; Secondary selection bindings.
266 (global-unset-key [M-mouse-1])
267 (global-unset-key [M-drag-mouse-1])
268 (global-unset-key [M-mouse-3])
269 (global-set-key [M-down-mouse-1] 'mouse-select-secondary)
270 (global-set-key [M-mouse-2] 'mouse-insert-secondary)
271 (global-set-key [M-down-mouse-3] 'mouse-extend-secondary))))
273 ;;=== Command Variable ====================================================
275 ;; This has to come after the function `mouse-sel-mode' and its callee.
276 ;; An alternative is to put the option `mouse-sel-mode' here and remove its
277 ;; `:initialize' keyword.
278 (when mouse-sel-mode
279 (mouse-sel-mode t))
281 ;;=== Internal Variables/Constants ========================================
283 (defvar mouse-sel-primary-thing nil
284 "Type of PRIMARY selection in current buffer.")
285 (make-variable-buffer-local 'mouse-sel-primary-thing)
287 (defvar mouse-sel-secondary-thing nil
288 "Type of SECONDARY selection in current buffer.")
289 (make-variable-buffer-local 'mouse-sel-secondary-thing)
291 ;; Ensure that secondary overlay is defined
292 (unless (overlayp mouse-secondary-overlay)
293 (setq mouse-secondary-overlay (make-overlay 1 1))
294 (overlay-put mouse-secondary-overlay 'face 'secondary-selection))
296 (defconst mouse-sel-selection-alist
297 '((PRIMARY mouse-drag-overlay mouse-sel-primary-thing)
298 (SECONDARY mouse-secondary-overlay mouse-sel-secondary-thing))
299 "Alist associating selections with variables. Each element is of
300 the form:
302 (SELECTION-NAME OVERLAY-SYMBOL SELECTION-THING-SYMBOL)
304 where SELECTION-NAME = name of selection
305 OVERLAY-SYMBOL = name of variable containing overlay to use
306 SELECTION-THING-SYMBOL = name of variable where the current selection
307 type for this selection should be stored.")
309 (defvar mouse-sel-set-selection-function
310 (if (eq mouse-sel-default-bindings 'interprogram-cut-paste)
311 'x-set-selection
312 (lambda (selection value)
313 (if (eq selection 'PRIMARY)
314 (x-select-text value)
315 (x-set-selection selection value))))
316 "Function to call to set selection.
317 Called with two arguments:
319 SELECTION, the name of the selection concerned, and
320 VALUE, the text to store.
322 This sets the selection as well as the cut buffer for the older applications,
323 unless `mouse-sel-default-bindings' is `interprogram-cut-paste'.")
325 (defvar mouse-sel-get-selection-function
326 (lambda (selection)
327 (if (eq selection 'PRIMARY)
328 (or (x-cut-buffer-or-selection-value) x-last-selected-text)
329 (x-get-selection selection)))
330 "Function to call to get the selection.
331 Called with one argument:
333 SELECTION: the name of the selection concerned.")
335 ;;=== Support/access functions ============================================
337 (defun mouse-sel-determine-selection-thing (nclicks)
338 "Determine what `thing' `mouse-sel' should operate on.
339 The first argument is NCLICKS, is the number of consecutive
340 mouse clicks at the same position.
342 Double-clicking on word constituents selects words.
343 Double-clicking on symbol constituents selects symbols.
344 Double-clicking on quotes or parentheses selects sexps.
345 Double-clicking on whitespace selects whitespace.
346 Triple-clicking selects lines.
347 Quad-clicking selects paragraphs.
349 Feel free to re-define this function to support your own desired
350 multi-click semantics."
351 (let* ((next-char (char-after (point)))
352 (char-syntax (if next-char (char-syntax next-char))))
353 (if mouse-sel-cycle-clicks
354 (setq nclicks (1+ (% (1- nclicks) 4))))
355 (cond
356 ((= nclicks 1) nil)
357 ((= nclicks 3) 'line)
358 ((>= nclicks 4) 'paragraph)
359 ((memq char-syntax '(?\( ?\) ?\" ?')) 'sexp)
360 ((memq next-char '(? ?\t ?\n)) 'whitespace)
361 ((eq char-syntax ?_) 'symbol)
362 ((eq char-syntax ?w) 'word))))
364 (defun mouse-sel-set-selection (selection value)
365 "Set the specified SELECTION to VALUE."
366 (if mouse-sel-set-selection-function
367 (funcall mouse-sel-set-selection-function selection value)
368 (put 'mouse-sel-internal-selection selection value)))
370 (defun mouse-sel-get-selection (selection)
371 "Get the value of the specified SELECTION."
372 (if mouse-sel-get-selection-function
373 (funcall mouse-sel-get-selection-function selection)
374 (get 'mouse-sel-internal-selection selection)))
376 (defun mouse-sel-selection-overlay (selection)
377 "Return overlay corresponding to SELECTION."
378 (let ((symbol (nth 1 (assoc selection mouse-sel-selection-alist))))
379 (or symbol (error "No overlay corresponding to %s selection" selection))
380 (symbol-value symbol)))
382 (defun mouse-sel-selection-thing (selection)
383 "Return overlay corresponding to SELECTION."
384 (let ((symbol (nth 2 (assoc selection mouse-sel-selection-alist))))
385 (or symbol (error "No symbol corresponding to %s selection" selection))
386 symbol))
388 (defun mouse-sel-region-to-primary (orig-window)
389 "Convert region to PRIMARY overlay and deactivate region.
390 Argument ORIG-WINDOW specifies the window the cursor was in when the
391 originating command was issued, and is used to determine whether the
392 region was visible or not."
393 (if transient-mark-mode
394 (let ((overlay (mouse-sel-selection-overlay 'PRIMARY)))
395 (cond
396 ((and mark-active
397 (or highlight-nonselected-windows
398 (eq orig-window (selected-window))))
399 ;; Region was visible, so convert region to overlay
400 (move-overlay overlay (region-beginning) (region-end)
401 (current-buffer)))
402 ((eq orig-window (selected-window))
403 ;; Point was visible, so set overlay at point
404 (move-overlay overlay (point) (point) (current-buffer)))
406 ;; Nothing was visible, so remove overlay
407 (delete-overlay overlay)))
408 (setq mark-active nil))))
410 (defun mouse-sel-primary-to-region (&optional direction)
411 "Convert PRIMARY overlay to region.
412 Optional argument DIRECTION specifies the mouse drag direction: a value of
413 1 indicates that the mouse was dragged left-to-right, otherwise it was
414 dragged right-to-left."
415 (let* ((overlay (mouse-sel-selection-overlay 'PRIMARY))
416 (start (overlay-start overlay))
417 (end (overlay-end overlay)))
418 (if (eq start end)
419 (progn
420 (if start (goto-char start))
421 (deactivate-mark))
422 (if (and mouse-sel-leave-point-near-mouse (eq direction 1))
423 (progn
424 (goto-char end)
425 (push-mark start 'nomsg 'active))
426 (goto-char start)
427 (push-mark end 'nomsg 'active)))
428 (if transient-mark-mode (delete-overlay overlay))))
430 (defmacro mouse-sel-eval-at-event-end (event &rest forms)
431 "Evaluate forms at mouse position.
432 Move to the end position of EVENT, execute FORMS, and restore original
433 point and window."
435 (let ((posn (event-end (, event))))
436 (if posn (mouse-minibuffer-check (, event)))
437 (if (and posn (not (windowp (posn-window posn))))
438 (error "Cursor not in text area of window"))
439 (let (orig-window orig-point-marker)
440 (setq orig-window (selected-window))
441 (if posn (select-window (posn-window posn)))
442 (setq orig-point-marker (point-marker))
443 (if (and posn (numberp (posn-point posn)))
444 (goto-char (posn-point posn)))
445 (unwind-protect
446 (progn
447 (,@ forms))
448 (goto-char (marker-position orig-point-marker))
449 (move-marker orig-point-marker nil)
450 (select-window orig-window)
451 )))))
453 (put 'mouse-sel-eval-at-event-end 'lisp-indent-hook 1)
455 ;;=== Select ==============================================================
457 (defun mouse-select (event)
458 "Set region/selection using the mouse.
460 Click sets point & mark to click position.
461 Dragging extends region/selection.
463 Multi-clicking selects word/lines/paragraphs, as determined by
464 'mouse-sel-determine-selection-thing.
466 Clicking mouse-2 while selecting copies selected text to the kill-ring.
467 Clicking mouse-1 or mouse-3 kills the selected text.
469 This should be bound to a down-mouse event."
470 (interactive "@e")
471 (let (direction)
472 (unwind-protect
473 (setq direction (mouse-select-internal 'PRIMARY event))
474 (mouse-sel-primary-to-region direction))))
476 (defun mouse-select-secondary (event)
477 "Set secondary selection using the mouse.
479 Click sets the start of the secondary selection to click position.
480 Dragging extends the secondary selection.
482 Multi-clicking selects word/lines/paragraphs, as determined by
483 'mouse-sel-determine-selection-thing.
485 Clicking mouse-2 while selecting copies selected text to the kill-ring.
486 Clicking mouse-1 or mouse-3 kills the selected text.
488 This should be bound to a down-mouse event."
489 (interactive "e")
490 (mouse-select-internal 'SECONDARY event))
492 (defun mouse-select-internal (selection event)
493 "Set SELECTION using the mouse."
494 (mouse-sel-eval-at-event-end event
495 (let ((thing-symbol (mouse-sel-selection-thing selection))
496 (overlay (mouse-sel-selection-overlay selection)))
497 (set thing-symbol
498 (mouse-sel-determine-selection-thing (event-click-count event)))
499 (let ((object-bounds (bounds-of-thing-at-point
500 (symbol-value thing-symbol))))
501 (if object-bounds
502 (progn
503 (move-overlay overlay
504 (car object-bounds) (cdr object-bounds)
505 (current-buffer)))
506 (move-overlay overlay (point) (point) (current-buffer)))))
507 (mouse-extend-internal selection)))
509 ;;=== Extend ==============================================================
511 (defun mouse-extend (event)
512 "Extend region/selection using the mouse."
513 (interactive "e")
514 (let ((orig-window (selected-window))
515 direction)
516 (select-window (posn-window (event-end event)))
517 (unwind-protect
518 (progn
519 (mouse-sel-region-to-primary orig-window)
520 (setq direction (mouse-extend-internal 'PRIMARY event)))
521 (mouse-sel-primary-to-region direction))))
523 (defun mouse-extend-secondary (event)
524 "Extend secondary selection using the mouse."
525 (interactive "e")
526 (save-window-excursion
527 (mouse-extend-internal 'SECONDARY event)))
529 (defun mouse-extend-internal (selection &optional initial-event)
530 "Extend specified SELECTION using the mouse.
531 Track mouse-motion events, adjusting the SELECTION appropriately.
532 Optional argument INITIAL-EVENT specifies an initial down-mouse event to
533 process.
535 See documentation for mouse-select-internal for more details."
536 (mouse-sel-eval-at-event-end initial-event
537 (let ((orig-cursor-type
538 (cdr (assoc 'cursor-type (frame-parameters (selected-frame))))))
539 (unwind-protect
541 (let* ((thing-symbol (mouse-sel-selection-thing selection))
542 (overlay (mouse-sel-selection-overlay selection))
543 (orig-window (selected-window))
544 (orig-window-frame (window-frame orig-window))
545 (top (nth 1 (window-edges orig-window)))
546 (bottom (nth 3 (window-edges orig-window)))
547 (mark-active nil) ; inhibit normal region highlight
548 (echo-keystrokes 0) ; don't echo mouse events
549 min max
550 direction
551 event)
553 ;; Get current bounds of overlay
554 (if (eq (overlay-buffer overlay) (current-buffer))
555 (setq min (overlay-start overlay)
556 max (overlay-end overlay))
557 (setq min (point)
558 max min)
559 (set thing-symbol nil))
562 ;; Bar cursor
563 (if (fboundp 'modify-frame-parameters)
564 (modify-frame-parameters (selected-frame)
565 '((cursor-type . bar))))
567 ;; Handle dragging
568 (track-mouse
570 (while (if initial-event ; Use initial event
571 (prog1
572 (setq event initial-event)
573 (setq initial-event nil))
574 (setq event (read-event))
575 (and (consp event)
576 (memq (car event) '(mouse-movement switch-frame))))
578 (let ((selection-thing (symbol-value thing-symbol))
579 (end (event-end event)))
581 (cond
583 ;; Ignore any movement outside the frame
584 ((eq (car-safe event) 'switch-frame) nil)
585 ((and (posn-window end)
586 (not (eq (let ((posn-w (posn-window end)))
587 (if (windowp posn-w)
588 (window-frame posn-w)
589 posn-w))
590 (window-frame orig-window)))) nil)
592 ;; Different window, same frame
593 ((not (eq (posn-window end) orig-window))
594 (let ((end-row (cdr (cdr (mouse-position)))))
595 (cond
596 ((and end-row (not (bobp)) (< end-row top))
597 (mouse-scroll-subr orig-window (- end-row top)
598 overlay max))
599 ((and end-row (not (eobp)) (>= end-row bottom))
600 (mouse-scroll-subr orig-window (1+ (- end-row bottom))
601 overlay min))
604 ;; On the mode line
605 ((eq (posn-point end) 'mode-line)
606 (mouse-scroll-subr orig-window 1 overlay min))
608 ;; In original window
609 (t (goto-char (posn-point end)))
613 ;; Determine direction of drag
614 (cond
615 ((and (not direction) (not (eq min max)))
616 (setq direction (if (< (point) (/ (+ min max) 2)) -1 1)))
617 ((and (not (eq direction -1)) (<= (point) min))
618 (setq direction -1))
619 ((and (not (eq direction 1)) (>= (point) max))
620 (setq direction 1)))
622 (if (not selection-thing) nil
624 ;; If dragging forward, goal is next character
625 (if (and (eq direction 1) (not (eobp))) (forward-char 1))
627 ;; Move to start/end of selected thing
628 (let ((goal (point)))
629 (goto-char (if (eq 1 direction) min max))
630 (condition-case nil
631 (progn
632 (while (> (* direction (- goal (point))) 0)
633 (forward-thing selection-thing direction))
634 (let ((end (point)))
635 (forward-thing selection-thing (- direction))
636 (goto-char
637 (if (> (* direction (- goal (point))) 0)
638 end (point)))))
639 (error))))
641 ;; Move overlay
642 (move-overlay overlay
643 (if (eq 1 direction) min (point))
644 (if (eq -1 direction) max (point))
645 (current-buffer))
647 ))) ; end track-mouse
649 ;; Finish up after dragging
650 (let ((overlay-start (overlay-start overlay))
651 (overlay-end (overlay-end overlay)))
653 ;; Set selection
654 (if (not (eq overlay-start overlay-end))
655 (mouse-sel-set-selection
656 selection
657 (buffer-substring overlay-start overlay-end)))
659 ;; Handle copy/kill
660 (let (this-command)
661 (cond
662 ((eq (event-basic-type last-input-event) 'mouse-2)
663 (copy-region-as-kill overlay-start overlay-end)
664 (read-event) (read-event))
665 ((and (memq (event-basic-type last-input-event)
666 '(mouse-1 mouse-3))
667 (memq 'down (event-modifiers last-input-event)))
668 (kill-region overlay-start overlay-end)
669 (move-overlay overlay overlay-start overlay-start)
670 (read-event) (read-event))
671 ((and (eq (event-basic-type last-input-event) 'mouse-3)
672 (memq 'double (event-modifiers last-input-event)))
673 (kill-region overlay-start overlay-end)
674 (move-overlay overlay overlay-start overlay-start)))))
676 direction)
678 ;; Restore cursor
679 (if (fboundp 'modify-frame-parameters)
680 (modify-frame-parameters
681 (selected-frame) (list (cons 'cursor-type orig-cursor-type))))
683 ))))
685 ;;=== Paste ===============================================================
687 (defun mouse-insert-selection (event)
688 "Insert the contents of the PRIMARY selection at mouse click.
689 If `mouse-yank-at-point' is non-nil, insert at point instead."
690 (interactive "e")
691 (mouse-insert-selection-internal 'PRIMARY event))
693 (defun mouse-insert-secondary (event)
694 "Insert the contents of the SECONDARY selection at mouse click.
695 If `mouse-yank-at-point' is non-nil, insert at point instead."
696 (interactive "e")
697 (mouse-insert-selection-internal 'SECONDARY event))
699 (defun mouse-insert-selection-internal (selection event)
700 "Insert the contents of the named SELECTION at mouse click.
701 If `mouse-yank-at-point' is non-nil, insert at point instead."
702 (unless mouse-yank-at-point
703 (mouse-set-point event))
704 (when mouse-sel-get-selection-function
705 (push-mark (point) 'nomsg)
706 (insert (or (funcall mouse-sel-get-selection-function selection) ""))))
708 ;;=== Handle loss of selections ===========================================
710 (defun mouse-sel-lost-selection-hook (selection)
711 "Remove the overlay for a lost selection."
712 (let ((overlay (mouse-sel-selection-overlay selection)))
713 (delete-overlay overlay)))
715 ;;=== Bug reporting =======================================================
717 ;(defconst mouse-sel-maintainer-address "mikew@gopher.dosli.govt.nz")
719 ;(defun mouse-sel-submit-bug-report ()
720 ; "Submit a bug report on mouse-sel.el via mail."
721 ; (interactive)
722 ; (require 'reporter)
723 ; (reporter-submit-bug-report
724 ; mouse-sel-maintainer-address
725 ; (concat "mouse-sel.el "
726 ; (or (condition-case nil mouse-sel-version (error))
727 ; "(distributed with Emacs)"))
728 ; (list 'transient-mark-mode
729 ; 'delete-selection-mode
730 ; 'mouse-sel-default-bindings
731 ; 'mouse-sel-leave-point-near-mouse
732 ; 'mouse-sel-cycle-clicks
733 ; 'mouse-sel-selection-alist
734 ; 'mouse-sel-set-selection-function
735 ; 'mouse-sel-get-selection-function
736 ; 'mouse-yank-at-point)))
738 (provide 'mouse-sel)
740 ;; mouse-sel.el ends here.