1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
| | ;;; xwidget.el --- api functions for xwidgets -*- lexical-binding: t -*-
;;
;; Copyright (C) 2011-2016 Free Software Foundation, Inc.
;;
;; Author: Joakim Verona (joakim@verona.se)
;;
;; This file is part of GNU Emacs.
;;
;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;
;; --------------------------------------------------------------------
;;; Commentary:
;;
;; See xwidget.c for more api functions.
;; This breaks compilation when we don't have xwidgets.
;; And is pointless when we do, since it's in C and so preloaded.
;;(require 'xwidget-internal)
;;; Code:
(require 'cl-lib)
(require 'bookmark)
(defcustom xwidget-webkit-scroll-behavior 'native
"Scrolling behavior of the webkit instance.
The possible values are: `native' or `image'."
:version "25.1"
:group 'frames ; TODO add xwidgets group if more options are added
:type '(choice (const native) (const image)))
(declare-function make-xwidget "xwidget.c"
(type title width height arguments &optional buffer))
(declare-function xwidget-set-adjustment "xwidget.c"
(xwidget axis relative value))
(declare-function xwidget-buffer "xwidget.c" (xwidget))
(declare-function xwidget-webkit-get-title "xwidget.c" (xwidget))
(declare-function xwidget-size-request "xwidget.c" (xwidget))
(declare-function xwidget-resize "xwidget.c" (xwidget new-width new-height))
(declare-function xwidget-webkit-execute-script "xwidget.c" (xwidget script))
(declare-function xwidget-webkit-goto-uri "xwidget.c" (xwidget uri))
(declare-function xwidget-plist "xwidget.c" (xwidget))
(declare-function set-xwidget-plist "xwidget.c" (xwidget plist))
(declare-function xwidget-view-window "xwidget.c" (xwidget-view))
(declare-function xwidget-view-model "xwidget.c" (xwidget-view))
(declare-function delete-xwidget-view "xwidget.c" (xwidget-view))
(declare-function get-buffer-xwidgets "xwidget.c" (buffer))
(declare-function xwidget-query-on-exit-flag "xwidget.c" (xwidget))
(defun xwidget-insert (pos type title width height &optional args)
"Insert an xwidget at position POS.
Supply the xwidget's TYPE, TITLE, WIDTH, and HEIGHT.
See `make-xwidget' for the possible TYPE values.
The usage of optional argument ARGS depends on the xwidget.
This returns the result of `make-xwidget'."
(goto-char pos)
(let ((id (make-xwidget type title width height args)))
(put-text-property (point) (+ 1 (point))
'display (list 'xwidget ':xwidget id))
id))
(defun xwidget-at (pos)
"Return xwidget at POS."
;; TODO this function is a bit tedious because the C layer isn't well
;; protected yet and xwidgetp apparently doesn't work yet.
(let* ((disp (get-text-property pos 'display))
(xw (car (cdr (cdr disp)))))
;;(if (xwidgetp xw) xw nil)
(if (equal 'xwidget (car disp)) xw)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; webkit support
(require 'browse-url)
(require 'image-mode);;for some image-mode alike functionality
;;;###autoload
(defun xwidget-webkit-browse-url (url &optional new-session)
"Ask xwidget-webkit to browse URL.
NEW-SESSION specifies whether to create a new xwidget-webkit session.
Interactively, URL defaults to the string looking like a url around point."
(interactive (progn
(require 'browse-url)
(browse-url-interactive-arg "xwidget-webkit URL: "
;;(xwidget-webkit-current-url)
)))
(or (featurep 'xwidget-internal)
(user-error "Your Emacs was not compiled with xwidgets support"))
(when (stringp url)
(if new-session
(xwidget-webkit-new-session url)
(xwidget-webkit-goto-url url))))
;;todo.
;; - check that the webkit support is compiled in
(defvar xwidget-webkit-mode-map
(let ((map (make-sparse-keymap)))
(define-key map "g" 'xwidget-webkit-browse-url)
(define-key map "a" 'xwidget-webkit-adjust-size-dispatch)
(define-key map "b" 'xwidget-webkit-back)
(define-key map "r" 'xwidget-webkit-reload)
(define-key map "t" (lambda () (interactive) (message "o"))) ;FIXME: ?!?
(define-key map "\C-m" 'xwidget-webkit-insert-string)
(define-key map "w" 'xwidget-webkit-current-url)
;;similar to image mode bindings
(define-key map (kbd "SPC") 'xwidget-webkit-scroll-up)
(define-key map (kbd "DEL") 'xwidget-webkit-scroll-down)
(define-key map [remap scroll-up] 'xwidget-webkit-scroll-up)
(define-key map [remap scroll-up-command] 'xwidget-webkit-scroll-up)
(define-key map [remap scroll-down] 'xwidget-webkit-scroll-down)
(define-key map [remap scroll-down-command] 'xwidget-webkit-scroll-down)
(define-key map [remap forward-char] 'xwidget-webkit-scroll-forward)
(define-key map [remap backward-char] 'xwidget-webkit-scroll-backward)
(define-key map [remap right-char] 'xwidget-webkit-scroll-forward)
(define-key map [remap left-char] 'xwidget-webkit-scroll-backward)
;; (define-key map [remap previous-line] 'image-previous-line)
;; (define-key map [remap next-line] 'image-next-line)
;; (define-key map [remap move-beginning-of-line] 'image-bol)
;; (define-key map [remap move-end-of-line] 'image-eol)
;; (define-key map [remap beginning-of-buffer] 'image-bob)
;; (define-key map [remap end-of-buffer] 'image-eob)
map)
"Keymap for `xwidget-webkit-mode'.")
(defun xwidget-webkit-scroll-up ()
"Scroll webkit up.
Depending on the value of `xwidget-webkit-scroll-behavior',
this scrolls in `native' fashion, or like `image-mode' would."
(interactive)
(if (eq xwidget-webkit-scroll-behavior 'native)
(xwidget-set-adjustment (xwidget-webkit-last-session) 'vertical t 50)
(image-scroll-up)))
(defun xwidget-webkit-scroll-down ()
"Scroll webkit down.
Depending on the value of `xwidget-webkit-scroll-behavior',
this scrolls in `native' fashion, or like `image-mode' would."
(interactive)
(if (eq xwidget-webkit-scroll-behavior 'native)
(xwidget-set-adjustment (xwidget-webkit-last-session) 'vertical t -50)
(image-scroll-down)))
(defun xwidget-webkit-scroll-forward ()
"Scroll webkit forwards.
Depending on the value of `xwidget-webkit-scroll-behavior',
this scrolls in `native' fashion, or like `image-mode' would."
(interactive)
(if (eq xwidget-webkit-scroll-behavior 'native)
(xwidget-set-adjustment (xwidget-webkit-last-session) 'horizontal t 50)
(image-forward-hscroll 5)))
(defun xwidget-webkit-scroll-backward ()
"Scroll webkit backwards.
Depending on the value of `xwidget-webkit-scroll-behavior',
this scrolls in `native' fashion, or like `image-mode' would."
(interactive)
(if (eq xwidget-webkit-scroll-behavior 'native)
(xwidget-set-adjustment (xwidget-webkit-last-session) 'horizontal t -50)
(image-backward-hscroll 5)))
;; The xwidget event needs to go into a higher level handler
;; since the xwidget can generate an event even if it's offscreen.
;; TODO this needs to use callbacks and consider different xwidget event types.
(define-key (current-global-map) [xwidget-event] #'xwidget-event-handler)
(defun xwidget-log (&rest msg)
"Log MSG to a buffer."
(let ((buf (get-buffer-create " *xwidget-log*")))
(with-current-buffer buf
(insert (apply #'format msg))
(insert "\n"))))
(defun xwidget-event-handler ()
"Receive xwidget event."
(interactive)
(xwidget-log "stuff happened to xwidget %S" last-input-event)
(let*
((xwidget-event-type (nth 1 last-input-event))
(xwidget (nth 2 last-input-event))
;;(xwidget-callback (xwidget-get xwidget 'callback))
;;TODO stopped working for some reason
)
;;(funcall xwidget-callback xwidget xwidget-event-type)
(message "xw callback %s" xwidget)
(funcall 'xwidget-webkit-callback xwidget xwidget-event-type)))
(defun xwidget-webkit-callback (xwidget xwidget-event-type)
"Callback for xwidgets.
XWIDGET instance, XWIDGET-EVENT-TYPE depends on the originating xwidget."
(if (not (buffer-live-p (xwidget-buffer xwidget)))
(xwidget-log
"error: callback called for xwidget with dead buffer")
(with-current-buffer (xwidget-buffer xwidget)
(let* ((strarg (nth 3 last-input-event)))
(cond ((eq xwidget-event-type 'document-load-finished)
(xwidget-log "webkit finished loading: '%s'"
(xwidget-webkit-get-title xwidget))
;;TODO - check the native/internal scroll
;;(xwidget-adjust-size-to-content xwidget)
(xwidget-webkit-adjust-size-dispatch) ;;TODO xwidget arg
(rename-buffer (format "*xwidget webkit: %s *"
(xwidget-webkit-get-title xwidget)))
(pop-to-buffer (current-buffer)))
((eq xwidget-event-type
'navigation-policy-decision-requested)
(if (string-match ".*#\\(.*\\)" strarg)
(xwidget-webkit-show-id-or-named-element
xwidget
(match-string 1 strarg))))
(t (xwidget-log "unhandled event:%s" xwidget-event-type)))))))
(defvar bookmark-make-record-function)
(define-derived-mode xwidget-webkit-mode
special-mode "xwidget-webkit" "Xwidget webkit view mode."
(setq buffer-read-only t)
(setq-local bookmark-make-record-function
#'xwidget-webkit-bookmark-make-record)
;; Keep track of [vh]scroll when switching buffers
(image-mode-setup-winprops))
(defun xwidget-webkit-bookmark-make-record ()
"Integrate Emacs bookmarks with the webkit xwidget."
(nconc (bookmark-make-record-default t t)
`((page . ,(xwidget-webkit-current-url))
(handler . (lambda (bmk) (browse-url
(bookmark-prop-get bmk 'page)))))))
(defvar xwidget-webkit-last-session-buffer nil)
(defun xwidget-webkit-last-session ()
"Last active webkit, or nil."
(if (buffer-live-p xwidget-webkit-last-session-buffer)
(with-current-buffer xwidget-webkit-last-session-buffer
(xwidget-at (point-min)))
nil))
(defun xwidget-webkit-current-session ()
"Either the webkit in the current buffer, or the last one used.
The latter might be nil."
(or (xwidget-at (point-min)) (xwidget-webkit-last-session)))
(defun xwidget-adjust-size-to-content (xw)
"Resize XW to content."
;; xwidgets doesn't support widgets that have their own opinions about
;; size well, yet this reads the desired size and resizes the Emacs
;; allocated area accordingly.
(let ((size (xwidget-size-request xw)))
(xwidget-resize xw (car size) (cadr size))))
(defvar xwidget-webkit-activeelement-js"
function findactiveelement(doc){
//alert(doc.activeElement.value);
if(doc.activeElement.value != undefined){
return doc.activeElement;
}else{
// recurse over the child documents:
var frames = doc.getElementsByTagName('frame');
for (var i = 0; i < frames.length; i++)
{
var d = frames[i].contentDocument;
var rv = findactiveelement(d);
if(rv != undefined){
return rv;
}
}
}
return undefined;
};
"
"javascript that finds the active element."
;; Yes it's ugly, because:
;; - there is apparently no way to find the active frame other than recursion
;; - the js "for each" construct misbehaved on the "frames" collection
;; - a window with no frameset still has frames.length == 1, but
;; frames[0].document.activeElement != document.activeElement
;;TODO the activeelement type needs to be examined, for iframe, etc.
)
(defun xwidget-webkit-insert-string (xw str)
"Insert string STR in the active field in the webkit XW."
;; Read out the string in the field first and provide for edit.
(interactive
(let* ((xww (xwidget-webkit-current-session))
(field-value
(progn
(xwidget-webkit-execute-script xww xwidget-webkit-activeelement-js)
(xwidget-webkit-execute-script-rv
xww
"findactiveelement(document).value;")))
(field-type (xwidget-webkit-execute-script-rv
xww
"findactiveelement(document).type;")))
(list xww
(cond ((equal "text" field-type)
(read-string "Text: " field-value))
((equal "password" field-type)
(read-passwd "Password: " nil field-value))
((equal "textarea" field-type)
(xwidget-webkit-begin-edit-textarea xww field-value))))))
(xwidget-webkit-execute-script
xw
(format "findactiveelement(document).value='%s'" str)))
(defvar xwidget-xwbl)
(defun xwidget-webkit-begin-edit-textarea (xw text)
"Start editing of a webkit text area.
XW is the xwidget identifier, TEXT is retrieved from the webkit."
(switch-to-buffer
(generate-new-buffer "textarea"))
(set (make-local-variable 'xwidget-xwbl) xw)
(insert text))
(defun xwidget-webkit-end-edit-textarea ()
"End editing of a webkit text area."
(interactive)
(goto-char (point-min))
(while (search-forward "\n" nil t)
(replace-match "\\n" nil t))
(xwidget-webkit-execute-script
xwidget-xwbl
(format "findactiveelement(document).value='%s'"
(buffer-substring (point-min) (point-max))))
;;TODO convert linefeed to \n
)
(defun xwidget-webkit-show-named-element (xw element-name)
"Make webkit xwidget XW show a named element ELEMENT-NAME.
For example, use this to display an anchor."
(interactive (list (xwidget-webkit-current-session)
(read-string "Element name: ")))
;;TODO since an xwidget is an Emacs object, it is not trivial to do
;; some things that are taken for granted in a normal browser.
;; scrolling an anchor/named-element into view is one such thing.
;; This function implements a proof-of-concept for this. Problems
;; remaining: - The selected window is scrolled but this is not
;; always correct - This needs to be interfaced into browse-url
;; somehow. The tricky part is that we need to do this in two steps:
;; A: load the base url, wait for load signal to arrive B: navigate
;; to the anchor when the base url is finished rendering
;; This part figures out the Y coordinate of the element
(let ((y (string-to-number
(xwidget-webkit-execute-script-rv
xw
(format
"document.getElementsByName('%s')[0].getBoundingClientRect().top"
element-name)
0))))
;; Now we need to tell Emacs to scroll the element into view.
(xwidget-log "scroll: %d" y)
(set-window-vscroll (selected-window) y t)))
(defun xwidget-webkit-show-id-element (xw element-id)
"Make webkit xwidget XW show an id-element ELEMENT-ID.
For example, use this to display an anchor."
(interactive (list (xwidget-webkit-current-session)
(read-string "Element id: ")))
(let ((y (string-to-number
(xwidget-webkit-execute-script-rv
xw
(format "document.getElementById('%s').getBoundingClientRect().top"
element-id)
0))))
;; Now we need to tell Emacs to scroll the element into view.
(xwidget-log "scroll: %d" y)
(set-window-vscroll (selected-window) y t)))
(defun xwidget-webkit-show-id-or-named-element (xw element-id)
"Make webkit xwidget XW show a name or element id ELEMENT-ID.
For example, use this to display an anchor."
(interactive (list (xwidget-webkit-current-session)
(read-string "Name or element id: ")))
(let* ((y1 (string-to-number
(xwidget-webkit-execute-script-rv
xw
(format "document.getElementsByName('%s')[0].getBoundingClientRect().top" element-id)
"0")))
(y2 (string-to-number
(xwidget-webkit-execute-script-rv
xw
(format "document.getElementById('%s').getBoundingClientRect().top" element-id)
"0")))
(y3 (max y1 y2)))
;; Now we need to tell Emacs to scroll the element into view.
(xwidget-log "scroll: %d" y3)
(set-window-vscroll (selected-window) y3 t)))
(defun xwidget-webkit-adjust-size-to-content ()
"Adjust webkit to content size."
(interactive)
(xwidget-adjust-size-to-content (xwidget-webkit-current-session)))
(defun xwidget-webkit-adjust-size-dispatch ()
"Adjust size according to mode."
(interactive)
(if (eq xwidget-webkit-scroll-behavior 'native)
(xwidget-webkit-adjust-size-to-window)
(xwidget-webkit-adjust-size-to-content))
;; The recenter is intended to correct a visual glitch.
;; It errors out if the buffer isn't visible, but then we don't get
;; the glitch, so silence errors.
(ignore-errors
(recenter-top-bottom)))
(defun xwidget-webkit-adjust-size-to-window ()
"Adjust webkit to window."
(interactive)
(xwidget-resize (xwidget-webkit-current-session) (window-pixel-width)
(window-pixel-height)))
(defun xwidget-webkit-adjust-size (w h)
"Manually set webkit size to width W, height H."
;; TODO shouldn't be tied to the webkit xwidget
(interactive "nWidth:\nnHeight:\n")
(xwidget-resize (xwidget-webkit-current-session) w h))
(defun xwidget-webkit-fit-width ()
"Adjust width of webkit to window width."
(interactive)
(xwidget-webkit-adjust-size (- (nth 2 (window-inside-pixel-edges))
(car (window-inside-pixel-edges)))
1000))
(defun xwidget-webkit-new-session (url)
"Create a new webkit session buffer with URL."
(let*
((bufname (generate-new-buffer-name "*xwidget-webkit*"))
xw)
(setq xwidget-webkit-last-session-buffer (switch-to-buffer
(get-buffer-create bufname)))
(insert " 'a' adjusts the xwidget size.")
(setq xw (xwidget-insert 1 'webkit bufname 1000 1000))
(xwidget-put xw 'callback 'xwidget-webkit-callback)
(xwidget-webkit-mode)
(xwidget-webkit-goto-uri (xwidget-webkit-last-session) url)))
(defun xwidget-webkit-goto-url (url)
"Goto URL."
(if (xwidget-webkit-current-session)
(progn
(xwidget-webkit-goto-uri (xwidget-webkit-current-session) url))
(xwidget-webkit-new-session url)))
(defun xwidget-webkit-back ()
"Go back in history."
(interactive)
(xwidget-webkit-execute-script (xwidget-webkit-current-session)
"history.go(-1);"))
(defun xwidget-webkit-reload ()
"Reload current url."
(interactive)
(xwidget-webkit-execute-script (xwidget-webkit-current-session)
"history.go(0);"))
(defun xwidget-webkit-current-url ()
"Get the webkit url and place it on the kill-ring."
(interactive)
(let* ((rv (xwidget-webkit-execute-script-rv (xwidget-webkit-current-session)
"document.URL"))
(url (kill-new (or rv ""))))
(message "url: %s" url)
url))
(defun xwidget-webkit-execute-script-rv (xw script &optional default)
"Same as `xwidget-webkit-execute-script' but with return value.
XW is the webkit instance. SCRIPT is the script to execute.
DEFAULT is the default return value."
;; Notice the ugly "title" hack. It is needed because the Webkit
;; API at the time of writing didn't support returning values. This
;; is a wrapper for the title hack so it's easy to remove should
;; Webkit someday support JS return values or we find some other way
;; to access the DOM.
;; Reset webkit title. Not very nice.
(let* ((emptytag "titlecantbewhitespaceohthehorror")
title)
(xwidget-webkit-execute-script xw (format "document.title=\"%s\";"
(or default emptytag)))
(xwidget-webkit-execute-script xw (format "document.title=%s;" script))
(setq title (xwidget-webkit-get-title xw))
(if (equal emptytag title)
(setq title ""))
(unless title
(setq title default))
title))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun xwidget-webkit-get-selection ()
"Get the webkit selection."
(xwidget-webkit-execute-script-rv (xwidget-webkit-current-session)
"window.getSelection().toString();"))
(defun xwidget-webkit-copy-selection-as-kill ()
"Get the webkit selection and put it on the kill-ring."
(interactive)
(kill-new (xwidget-webkit-get-selection)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Xwidget plist management (similar to the process plist functions)
(defun xwidget-get (xwidget propname)
"Get an xwidget's property value.
XWIDGET is an xwidget, PROPNAME a property.
Returns the last value stored with `xwidget-put'."
(plist-get (xwidget-plist xwidget) propname))
(defun xwidget-put (xwidget propname value)
"Set an xwidget's property value.
XWIDGET is an xwidget, PROPNAME a property to be set to specified VALUE.
You can retrieve the value with `xwidget-get'."
(set-xwidget-plist xwidget
(plist-put (xwidget-plist xwidget) propname value)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defvar xwidget-view-list) ; xwidget.c
(defvar xwidget-list) ; xwidget.c
(defun xwidget-delete-zombies ()
"Helper for `xwidget-cleanup'."
(dolist (xwidget-view xwidget-view-list)
(when (or (not (window-live-p (xwidget-view-window xwidget-view)))
(not (memq (xwidget-view-model xwidget-view)
xwidget-list)))
(delete-xwidget-view xwidget-view))))
(defun xwidget-cleanup ()
"Delete zombie xwidgets."
;; During development it was sometimes easy to wind up with zombie
;; xwidget instances.
;; This function tries to implement a workaround should it occur again.
(interactive)
;; Kill xviews that should have been deleted but still linger.
(xwidget-delete-zombies)
;; Redraw display otherwise ghost of zombies will remain to haunt the screen
(redraw-display))
(defun xwidget-kill-buffer-query-function ()
"Ask before killing a buffer that has xwidgets."
(let ((xwidgets (get-buffer-xwidgets (current-buffer))))
(or (not xwidgets)
(not (memq t (mapcar #'xwidget-query-on-exit-flag xwidgets)))
(yes-or-no-p
(format "Buffer %S has xwidgets; kill it? " (buffer-name))))))
(when (featurep 'xwidget-internal)
(add-hook 'kill-buffer-query-functions #'xwidget-kill-buffer-query-function)
;; This would have felt better in C, but this seems to work well in
;; practice though.
(add-hook 'window-configuration-change-hook #'xwidget-delete-zombies))
(provide 'xwidget)
;;; xwidget.el ends here
|