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1 ;;; x-dnd.el --- drag and drop support for X.
2
3 ;; Copyright (C) 2004, 2005 Free Software Foundation, Inc.
4
5 ;; Author: Jan Dj\e,Ad\e(Brv <jan.h.d@swipnet.se>
6 ;; Maintainer: FSF
7 ;; Keywords: window, drag, drop
8
9 ;; This file is part of GNU Emacs.
10
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; any later version.
15
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
20
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
25
26 ;;; Commentary:
27
28 ;; This file provides the drop part only. Currently supported protocols
29 ;; are XDND, Motif and the old KDE 1.x protocol.
30
31 ;;; Code:
32
33 (require 'dnd)
34
35 ;;; Customizable variables
36 (defcustom x-dnd-test-function 'x-dnd-default-test-function
37 "The function drag and drop uses to determine if to accept or reject a drop.
38 The function takes three arguments, WINDOW ACTION and TYPES.
39 WINDOW is where the mouse is when the function is called. WINDOW may be a
40 frame if the mouse isn't over a real window (i.e. menu bar, tool bar or
41 scroll bar). ACTION is the suggested action from the drag and drop source,
42 one of the symbols move, copy link or ask. TYPES is a list of available types
43 for the drop.
44
45 The function shall return nil to reject the drop or a cons with two values,
46 the wanted action as car and the wanted type as cdr. The wanted action
47 can be copy, move, link, ask or private.
48 The default value for this variable is `x-dnd-default-test-function'."
49 :version "22.1"
50 :type 'symbol
51 :group 'x)
52
53
54
55 (defcustom x-dnd-types-alist
56 '(
57 ("text/uri-list" . x-dnd-handle-uri-list)
58 ("text/x-moz-url" . x-dnd-handle-moz-url)
59 ("_NETSCAPE_URL" . x-dnd-handle-uri-list)
60 ("FILE_NAME" . x-dnd-handle-file-name)
61 ("UTF8_STRING" . x-dnd-insert-utf8-text)
62 ("text/plain;charset=UTF-8" . x-dnd-insert-utf8-text)
63 ("text/plain;charset=utf-8" . x-dnd-insert-utf8-text)
64 ("text/unicode" . x-dnd-insert-utf16-text)
65 ("text/plain" . dnd-insert-text)
66 ("COMPOUND_TEXT" . x-dnd-insert-ctext)
67 ("STRING" . dnd-insert-text)
68 ("TEXT" . dnd-insert-text)
69 )
70 "Which function to call to handle a drop of that type.
71 If the type for the drop is not present, or the function is nil,
72 the drop is rejected. The function takes three arguments, WINDOW, ACTION
73 and DATA. WINDOW is where the drop occured, ACTION is the action for
74 this drop (copy, move, link, private or ask) as determined by a previous
75 call to `x-dnd-test-function'. DATA is the drop data.
76 The function shall return the action used (copy, move, link or private) if drop
77 is successful, nil if not."
78 :version "22.1"
79 :type 'alist
80 :group 'x)
81
82 (defcustom x-dnd-known-types
83 '("text/uri-list"
84 "text/x-moz-url"
85 "_NETSCAPE_URL"
86 "FILE_NAME"
87 "UTF8_STRING"
88 "text/plain;charset=UTF-8"
89 "text/plain;charset=utf-8"
90 "text/unicode"
91 "text/plain"
92 "COMPOUND_TEXT"
93 "STRING"
94 "TEXT"
95 )
96 "The types accepted by default for dropped data.
97 The types are chosen in the order they appear in the list."
98 :version "22.1"
99 :type '(repeat string)
100 :group 'x
101 )
102
103 ;; Internal variables
104
105 (defvar x-dnd-current-state nil
106 "The current state for a drop.
107 This is an alist with one entry for each display. The value for each display
108 is a vector that contains the state for drag and drop for that display.
109 Elements in the vector are:
110 Last buffer drag was in,
111 last window drag was in,
112 types available for drop,
113 the action suggested by the source,
114 the type we want for the drop,
115 the action we want for the drop,
116 any protocol specific data.")
117
118 (defvar x-dnd-empty-state [nil nil nil nil nil nil nil])
119
120
121
122 (defun x-dnd-init-frame (&optional frame)
123 "Setup drag and drop for FRAME (i.e. create appropriate properties)."
124 (when (eq 'x (window-system frame))
125 (x-dnd-init-xdnd-for-frame frame)
126 (x-dnd-init-motif-for-frame frame)))
127
128 (defun x-dnd-get-state-cons-for-frame (frame-or-window)
129 "Return the entry in x-dnd-current-state for a frame or window."
130 (let* ((frame (if (framep frame-or-window) frame-or-window
131 (window-frame frame-or-window)))
132 (display (frame-parameter frame 'display)))
133 (if (not (assoc display x-dnd-current-state))
134 (push (cons display (copy-sequence x-dnd-empty-state))
135 x-dnd-current-state))
136 (assoc display x-dnd-current-state)))
137
138 (defun x-dnd-get-state-for-frame (frame-or-window)
139 "Return the state in x-dnd-current-state for a frame or window."
140 (cdr (x-dnd-get-state-cons-for-frame frame-or-window)))
141
142 (defun x-dnd-default-test-function (window action types)
143 "The default test function for drag and drop.
144 WINDOW is where the mouse is when this function is called. It may be a frame
145 if the mouse is over the menu bar, scroll bar or tool bar.
146 ACTION is the suggested action from the source, and TYPES are the
147 types the drop data can have. This function only accepts drops with
148 types in `x-dnd-known-types'. It always returns the action private."
149 (let ((type (x-dnd-choose-type types)))
150 (when type (cons 'private type))))
151
152
153 (defun x-dnd-current-type (frame-or-window)
154 "Return the type we want the DND data to be in for the current drop.
155 FRAME-OR-WINDOW is the frame or window that the mouse is over."
156 (aref (x-dnd-get-state-for-frame frame-or-window) 4))
157
158 (defun x-dnd-forget-drop (frame-or-window)
159 "Remove all state for the last drop.
160 FRAME-OR-WINDOW is the frame or window that the mouse is over."
161 (setcdr (x-dnd-get-state-cons-for-frame frame-or-window)
162 (copy-sequence x-dnd-empty-state)))
163
164 (defun x-dnd-maybe-call-test-function (window action)
165 "Call `x-dnd-test-function' if something has changed.
166 WINDOW is the window the mouse is over. ACTION is the suggested
167 action from the source. If nothing has changed, return the last
168 action and type we got from `x-dnd-test-function'."
169 (let ((buffer (when (and (windowp window) (window-live-p window))
170 (window-buffer window)))
171 (current-state (x-dnd-get-state-for-frame window)))
172 (when (or (not (equal buffer (aref current-state 0)))
173 (not (equal window (aref current-state 1)))
174 (not (equal action (aref current-state 3))))
175 (save-excursion
176 (when buffer (set-buffer buffer))
177 (let* ((action-type (funcall x-dnd-test-function
178 window
179 action
180 (aref current-state 2)))
181 (handler (cdr (assoc (cdr action-type) x-dnd-types-alist))))
182 ;; Ignore action-type if we have no handler.
183 (setq current-state
184 (x-dnd-save-state window
185 action
186 (when handler action-type)))))))
187 (let ((current-state (x-dnd-get-state-for-frame window)))
188 (cons (aref current-state 5)
189 (aref current-state 4))))
190
191 (defun x-dnd-save-state (window action action-type &optional types extra-data)
192 "Save the state of the current drag and drop.
193 WINDOW is the window the mouse is over. ACTION is the action suggested
194 by the source. ACTION-TYPE is the result of calling `x-dnd-test-function'.
195 If given, TYPES are the types for the drop data that the source supports.
196 EXTRA-DATA is data needed for a specific protocol."
197 (let ((current-state (x-dnd-get-state-for-frame window)))
198 (aset current-state 5 (car action-type))
199 (aset current-state 4 (cdr action-type))
200 (aset current-state 3 action)
201 (when types (aset current-state 2 types))
202 (when extra-data (aset current-state 6 extra-data))
203 (aset current-state 1 window)
204 (aset current-state 0 (if (and (windowp window)
205 (window-live-p window))
206 (window-buffer window) nil))
207 (setcdr (x-dnd-get-state-cons-for-frame window) current-state)))
208
209
210 (defun x-dnd-handle-moz-url (window action data)
211 "Handle one item of type text/x-moz-url.
212 WINDOW is the window where the drop happened. ACTION is ignored.
213 DATA is the moz-url, which is formatted as two strings separated by \r\n.
214 The first string is the URL, the second string is the title of that URL.
215 DATA is encoded in utf-16. Decode the URL and call `x-dnd-handle-uri-list'."
216 ;; Mozilla and applications based on it (Galeon for example) uses
217 ;; text/unicode, but it is impossible to tell if it is le or be. Use what
218 ;; the machine Emacs runs on use. This looses if dropping between machines
219 ;; with different endian, but it is the best we can do.
220 (let* ((coding (if (eq (byteorder) ?B) 'utf-16be 'utf-16le))
221 (string (decode-coding-string data coding))
222 (strings (split-string string "[\r\n]" t))
223 ;; Can one drop more than one moz-url ?? Assume not.
224 (url (car strings))
225 (title (car (cdr strings))))
226 (x-dnd-handle-uri-list window action url)))
227
228 (defun x-dnd-insert-utf8-text (window action text)
229 "Decode the UTF-8 text and insert it at point.
230 TEXT is the text as a string, WINDOW is the window where the drop happened."
231 (dnd-insert-text window action (decode-coding-string text 'utf-8)))
232
233 (defun x-dnd-insert-utf16-text (window action text)
234 "Decode the UTF-16 text and insert it at point.
235 TEXT is the text as a string, WINDOW is the window where the drop happened."
236 ;; See comment in x-dnd-handle-moz-url about coding.
237 (let ((coding (if (eq (byteorder) ?B) 'utf-16be 'utf-16le)))
238 (dnd-insert-text window action (decode-coding-string text coding))))
239
240 (defun x-dnd-insert-ctext (window action text)
241 "Decode the compound text and insert it at point.
242 TEXT is the text as a string, WINDOW is the window where the drop happened."
243 (dnd-insert-text window action
244 (decode-coding-string text
245 'compound-text-with-extensions)))
246
247 (defun x-dnd-handle-uri-list (window action string)
248 "Split an uri-list into separate URIs and call `dnd-handle-one-url'.
249 WINDOW is the window where the drop happened.
250 STRING is the uri-list as a string. The URIs are separated by \r\n."
251 (let ((uri-list (split-string string "[\0\r\n]" t))
252 retval)
253 (dolist (bf uri-list)
254 ;; If one URL is handeled, treat as if the whole drop succeeded.
255 (let ((did-action (dnd-handle-one-url window action bf)))
256 (when did-action (setq retval did-action))))
257 retval))
258
259 (defun x-dnd-handle-file-name (window action string)
260 "Prepend file:// to file names and call `dnd-handle-one-url'.
261 WINDOW is the window where the drop happened.
262 STRING is the file names as a string, separated by nulls."
263 (let ((uri-list (split-string string "[\0\r\n]" t))
264 retval)
265 (dolist (bf uri-list)
266 ;; If one URL is handeled, treat as if the whole drop succeeded.
267 (let* ((file-uri (concat "file://" bf))
268 (did-action (dnd-handle-one-url window action file-uri)))
269 (when did-action (setq retval did-action))))
270 retval))
271
272
273 (defun x-dnd-choose-type (types &optional known-types)
274 "Choose which type we want to receive for the drop.
275 TYPES are the types the source of the drop offers, a vector of type names
276 as strings or symbols. Select among the types in `x-dnd-known-types' or
277 KNOWN-TYPES if given, and return that type name.
278 If no suitable type is found, return nil."
279 (let* ((known-list (or known-types x-dnd-known-types))
280 (first-known-type (car known-list))
281 (types-array types)
282 (found (when first-known-type
283 (catch 'done
284 (dotimes (i (length types-array))
285 (let* ((type (aref types-array i))
286 (typename (if (symbolp type)
287 (symbol-name type) type)))
288 (when (equal first-known-type typename)
289 (throw 'done first-known-type))))
290 nil))))
291
292 (if (and (not found) (cdr known-list))
293 (x-dnd-choose-type types (cdr known-list))
294 found)))
295
296 (defun x-dnd-drop-data (event frame window data type)
297 "Drop one data item onto a frame.
298 EVENT is the client message for the drop, FRAME is the frame the drop occurred
299 on. WINDOW is the window of FRAME where the drop happened. DATA is the data
300 received from the source, and type is the type for DATA, see
301 `x-dnd-types-alist').
302
303 Returns the action used (move, copy, link, private) if drop was successful,
304 nil if not."
305 (let* ((type-info (assoc type x-dnd-types-alist))
306 (handler (cdr type-info))
307 (state (x-dnd-get-state-for-frame frame))
308 (action (aref state 5))
309 (w (posn-window (event-start event))))
310 (when handler
311 (if (and (windowp w) (window-live-p w))
312 ;; If dropping in a window, open files in that window rather
313 ;; than in a new widow.
314 (let ((dnd-open-file-other-window nil))
315 (goto-char (posn-point (event-start event)))
316 (funcall handler window action data))
317 (let ((dnd-open-file-other-window t)) ;; Dropping on non-window.
318 (select-frame frame)
319 (funcall handler window action data))))))
320
321 (defun x-dnd-handle-drag-n-drop-event (event)
322 "Receive drag and drop events (X client messages).
323 Currently XDND, Motif and old KDE 1.x protocols are recognized."
324 (interactive "e")
325 (let* ((client-message (car (cdr (cdr event))))
326 (window (posn-window (event-start event)))
327 (message-atom (aref client-message 0))
328 (frame (aref client-message 1))
329 (format (aref client-message 2))
330 (data (aref client-message 3)))
331
332 (cond ((equal "DndProtocol" message-atom) ; Old KDE 1.x.
333 (x-dnd-handle-old-kde event frame window message-atom format data))
334
335 ((equal "_MOTIF_DRAG_AND_DROP_MESSAGE" message-atom) ; Motif
336 (x-dnd-handle-motif event frame window message-atom format data))
337
338 ((and (> (length message-atom) 4) ; XDND protocol.
339 (equal "Xdnd" (substring message-atom 0 4)))
340 (x-dnd-handle-xdnd event frame window message-atom format data)))))
341
342
343 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
344 ;;; Old KDE protocol. Only dropping of files.
345
346 (defun x-dnd-handle-old-kde (event frame window message format data)
347 "Open the files in a KDE 1.x drop."
348 (let ((values (x-window-property "DndSelection" frame nil 0 t)))
349 (x-dnd-handle-uri-list window 'private
350 (replace-regexp-in-string "\0$" "" values))))
351 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
352
353
354
355 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
356 ;;; XDND protocol.
357
358 (defvar x-dnd-xdnd-to-action
359 '(("XdndActionPrivate" . private)
360 ("XdndActionCopy" . copy)
361 ("XdndActionMove" . move)
362 ("XdndActionLink" . link)
363 ("XdndActionAsk" . ask))
364 "Mapping from XDND action types to lisp symbols.")
365
366 (defun x-dnd-init-xdnd-for-frame (frame)
367 "Set the XdndAware property for FRAME to indicate that we do XDND."
368 (x-change-window-property "XdndAware"
369 '(5) ;; The version of XDND we support.
370 frame "ATOM" 32 t))
371
372 (defun x-dnd-get-drop-width-height (frame w accept)
373 "Return the widht/height to be sent in a XDndStatus message.
374 FRAME is the frame and W is the window where the drop happened.
375 If ACCEPT is nil return 0 (empty rectangle),
376 otherwise if W is a window, return its widht/height,
377 otherwise return the frame width/height."
378 (if accept
379 (if (windowp w) ;; w is not a window if dropping on the menu bar,
380 ;; scroll bar or tool bar.
381 (let ((edges (window-inside-pixel-edges w)))
382 (cons
383 (- (nth 2 edges) (nth 0 edges)) ;; right - left
384 (- (nth 3 edges) (nth 1 edges)))) ;; bottom - top
385 (cons (frame-pixel-width frame)
386 (frame-pixel-height frame)))
387 0))
388
389 (defun x-dnd-get-drop-x-y (frame w)
390 "Return the x/y coordinates to be sent in a XDndStatus message.
391 Coordinates are required to be absolute.
392 FRAME is the frame and W is the window where the drop happened.
393 If W is a window, return its absolute corrdinates,
394 otherwise return the frame coordinates."
395 (let* ((frame-left (frame-parameter frame 'left))
396 ;; If the frame is outside the display, frame-left looks like
397 ;; '(0 -16). Extract the -16.
398 (frame-real-left (if (consp frame-left) (car (cdr frame-left))
399 frame-left))
400 (frame-top (frame-parameter frame 'top))
401 (frame-real-top (if (consp frame-top) (car (cdr frame-top))
402 frame-top)))
403 (if (windowp w)
404 (let ((edges (window-inside-pixel-edges w)))
405 (cons
406 (+ frame-real-left (nth 0 edges))
407 (+ frame-real-top (nth 1 edges))))
408 (cons frame-real-left frame-real-top))))
409
410 (defun x-dnd-handle-xdnd (event frame window message format data)
411 "Receive one XDND event (client message) and send the appropriate reply.
412 EVENT is the client message. FRAME is where the mouse is now.
413 WINDOW is the window within FRAME where the mouse is now.
414 FORMAT is 32 (not used). MESSAGE is the data part of an XClientMessageEvent."
415 (cond ((equal "XdndEnter" message)
416 (let* ((flags (aref data 1))
417 (version (and (consp flags) (ash (car flags) -8)))
418 (more-than-3 (and (consp flags) (cdr flags)))
419 (dnd-source (aref data 0)))
420 (if version ;; If flags is bad, version will be nil.
421 (x-dnd-save-state
422 window nil nil
423 (if (> more-than-3 0)
424 (x-window-property "XdndTypeList"
425 frame "AnyPropertyType"
426 dnd-source nil t)
427 (vector (x-get-atom-name (aref data 2))
428 (x-get-atom-name (aref data 3))
429 (x-get-atom-name (aref data 4))))))))
430
431 ((equal "XdndPosition" message)
432 (let* ((x (car (aref data 2)))
433 (y (cdr (aref data 2)))
434 (action (x-get-atom-name (aref data 4)))
435 (dnd-source (aref data 0))
436 (dnd-time (aref data 3))
437 (action-type (x-dnd-maybe-call-test-function
438 window
439 (cdr (assoc action x-dnd-xdnd-to-action))))
440 (reply-action (car (rassoc (car action-type)
441 x-dnd-xdnd-to-action)))
442 (accept ;; 1 = accept, 0 = reject
443 (if (and reply-action action-type) 1 0))
444 (list-to-send
445 (list (string-to-number
446 (frame-parameter frame 'outer-window-id))
447 accept ;; 1 = Accept, 0 = reject.
448 (x-dnd-get-drop-x-y frame window)
449 (x-dnd-get-drop-width-height
450 frame window (eq accept 1))
451 (or reply-action 0)
452 )))
453 (x-send-client-message
454 frame dnd-source frame "XdndStatus" 32 list-to-send)
455 ))
456
457 ((equal "XdndLeave" message)
458 (x-dnd-forget-drop window))
459
460 ((equal "XdndDrop" message)
461 (if (windowp window) (select-window window))
462 (let* ((dnd-source (aref data 0))
463 (value (and (x-dnd-current-type window)
464 (x-get-selection-internal
465 'XdndSelection
466 (intern (x-dnd-current-type window)))))
467 success action ret-action)
468
469 (setq action (if value
470 (condition-case info
471 (x-dnd-drop-data event frame window value
472 (x-dnd-current-type window))
473 (error
474 (message "Error: %s" info)
475 nil))))
476
477 (setq success (if action 1 0))
478 (setq ret-action
479 (if (eq success 1)
480 (or (car (rassoc action x-dnd-xdnd-to-action))
481 "XdndActionPrivate")
482 0))
483
484 (x-send-client-message
485 frame dnd-source frame "XdndFinished" 32
486 (list (string-to-number (frame-parameter frame 'outer-window-id))
487 success ;; 1 = Success, 0 = Error
488 (if success "XdndActionPrivate" 0)
489 ))
490 (x-dnd-forget-drop window)))
491
492 (t (error "Unknown XDND message %s %s" message data))))
493
494 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
495 ;;; Motif protocol.
496
497 (defun x-dnd-init-motif-for-frame (frame)
498 "Set _MOTIF_DRAG_RECEIVER_INFO for FRAME to indicate that we do Motif DND."
499 (x-change-window-property "_MOTIF_DRAG_RECEIVER_INFO"
500 (list
501 (byteorder)
502 0 ; The Motif DND version.
503 5 ; We want drag dynamic.
504 0 0 0 0 0 0 0
505 0 0 0 0 0 0) ; Property must be 16 bytes.
506 frame "_MOTIF_DRAG_RECEIVER_INFO" 8 t))
507
508 (defun x-dnd-get-motif-value (data offset size byteorder)
509 (cond ((eq size 2)
510 (if (eq byteorder ?l)
511 (+ (ash (aref data (1+ offset)) 8)
512 (aref data offset))
513 (+ (ash (aref data offset) 8)
514 (aref data (1+ offset)))))
515
516 ((eq size 4)
517 (if (eq byteorder ?l)
518 (cons (+ (ash (aref data (+ 3 offset)) 8)
519 (aref data (+ 2 offset)))
520 (+ (ash (aref data (1+ offset)) 8)
521 (aref data offset)))
522 (cons (+ (ash (aref data offset) 8)
523 (aref data (1+ offset)))
524 (+ (ash (aref data (+ 2 offset)) 8)
525 (aref data (+ 3 offset))))))))
526
527 (defun x-dnd-motif-value-to-list (value size byteorder)
528 (let ((bytes (cond ((eq size 2)
529 (list (logand (lsh value -8) ?\xff)
530 (logand value ?\xff)))
531
532 ((eq size 4)
533 (if (consp value)
534 (list (logand (lsh (car value) -8) ?\xff)
535 (logand (car value) ?\xff)
536 (logand (lsh (cdr value) -8) ?\xff)
537 (logand (cdr value) ?\xff))
538 (list (logand (lsh value -24) ?\xff)
539 (logand (lsh value -16) ?\xff)
540 (logand (lsh value -8) ?\xff)
541 (logand value ?\xff)))))))
542 (if (eq byteorder ?l)
543 (reverse bytes)
544 bytes)))
545
546
547 (defvar x-dnd-motif-message-types
548 '((0 . XmTOP_LEVEL_ENTER)
549 (1 . XmTOP_LEVEL_LEAVE)
550 (2 . XmDRAG_MOTION)
551 (3 . XmDROP_SITE_ENTER)
552 (4 . XmDROP_SITE_LEAVE)
553 (5 . XmDROP_START)
554 (6 . XmDROP_FINISH)
555 (7 . XmDRAG_DROP_FINISH)
556 (8 . XmOPERATION_CHANGED))
557 "Mapping from numbers to Motif DND message types.")
558
559 (defvar x-dnd-motif-to-action
560 '((1 . move)
561 (2 . copy)
562 (3 . link) ; Both 3 and 4 has been seen as link.
563 (4 . link)
564 (2 . private)) ; Motif does not have private, so use copy for private.
565 "Mapping from number to operation for Motif DND.")
566
567 (defun x-dnd-handle-motif (event frame window message-atom format data)
568 (let* ((message-type (cdr (assoc (aref data 0) x-dnd-motif-message-types)))
569 (source-byteorder (aref data 1))
570 (my-byteorder (byteorder))
571 (source-flags (x-dnd-get-motif-value data 2 2 source-byteorder))
572 (source-action (cdr (assoc (logand ?\xF source-flags)
573 x-dnd-motif-to-action))))
574
575 (cond ((eq message-type 'XmTOP_LEVEL_ENTER)
576 (let* ((dnd-source (x-dnd-get-motif-value
577 data 8 4 source-byteorder))
578 (selection-atom (x-dnd-get-motif-value
579 data 12 4 source-byteorder))
580 (atom-name (x-get-atom-name selection-atom))
581 (types (when atom-name
582 (x-get-selection-internal (intern atom-name)
583 'TARGETS))))
584 (x-dnd-forget-drop frame)
585 (when types (x-dnd-save-state window nil nil
586 types
587 dnd-source))))
588
589 ;; Can not forget drop here, LEAVE comes before DROP_START and
590 ;; we need the state in DROP_START.
591 ((eq message-type 'XmTOP_LEVEL_LEAVE)
592 nil)
593
594 ((eq message-type 'XmDRAG_MOTION)
595 (let* ((state (x-dnd-get-state-for-frame frame))
596 (timestamp (x-dnd-motif-value-to-list
597 (x-dnd-get-motif-value data 4 4
598 source-byteorder)
599 4 my-byteorder))
600 (x (x-dnd-motif-value-to-list
601 (x-dnd-get-motif-value data 8 2 source-byteorder)
602 2 my-byteorder))
603 (y (x-dnd-motif-value-to-list
604 (x-dnd-get-motif-value data 10 2 source-byteorder)
605 2 my-byteorder))
606 (dnd-source (aref state 6))
607 (first-move (not (aref state 3)))
608 (action-type (x-dnd-maybe-call-test-function
609 window
610 source-action))
611 (reply-action (car (rassoc (car action-type)
612 x-dnd-motif-to-action)))
613 (reply-flags
614 (x-dnd-motif-value-to-list
615 (if reply-action
616 (+ reply-action
617 ?\x30 ; 30: valid drop site
618 ?\x700) ; 700: can do copy, move or link
619 ?\x30) ; 30: drop site, but noop.
620 2 my-byteorder))
621 (reply (append
622 (list
623 (+ ?\x80 ; 0x80 indicates a reply.
624 (if first-move
625 3 ; First time, reply is SITE_ENTER.
626 2)) ; Not first time, reply is DRAG_MOTION.
627 my-byteorder)
628 reply-flags
629 timestamp
630 x
631 y)))
632 (x-send-client-message frame
633 dnd-source
634 frame
635 "_MOTIF_DRAG_AND_DROP_MESSAGE"
636 8
637 reply)))
638
639 ((eq message-type 'XmOPERATION_CHANGED)
640 (let* ((state (x-dnd-get-state-for-frame frame))
641 (timestamp (x-dnd-motif-value-to-list
642 (x-dnd-get-motif-value data 4 4 source-byteorder)
643 4 my-byteorder))
644 (dnd-source (aref state 6))
645 (action-type (x-dnd-maybe-call-test-function
646 window
647 source-action))
648 (reply-action (car (rassoc (car action-type)
649 x-dnd-motif-to-action)))
650 (reply-flags
651 (x-dnd-motif-value-to-list
652 (if reply-action
653 (+ reply-action
654 ?\x30 ; 30: valid drop site
655 ?\x700) ; 700: can do copy, move or link
656 ?\x30) ; 30: drop site, but noop
657 2 my-byteorder))
658 (reply (append
659 (list
660 (+ ?\x80 ; 0x80 indicates a reply.
661 8) ; 8 is OPERATION_CHANGED
662 my-byteorder)
663 reply-flags
664 timestamp)))
665 (x-send-client-message frame
666 dnd-source
667 frame
668 "_MOTIF_DRAG_AND_DROP_MESSAGE"
669 8
670 reply)))
671
672 ((eq message-type 'XmDROP_START)
673 (let* ((x (x-dnd-motif-value-to-list
674 (x-dnd-get-motif-value data 8 2 source-byteorder)
675 2 my-byteorder))
676 (y (x-dnd-motif-value-to-list
677 (x-dnd-get-motif-value data 10 2 source-byteorder)
678 2 my-byteorder))
679 (selection-atom (x-dnd-get-motif-value
680 data 12 4 source-byteorder))
681 (atom-name (x-get-atom-name selection-atom))
682 (dnd-source (x-dnd-get-motif-value
683 data 16 4 source-byteorder))
684 (action-type (x-dnd-maybe-call-test-function
685 window
686 source-action))
687 (reply-action (car (rassoc (car action-type)
688 x-dnd-motif-to-action)))
689 (reply-flags
690 (x-dnd-motif-value-to-list
691 (if reply-action
692 (+ reply-action
693 ?\x30 ; 30: valid drop site
694 ?\x700) ; 700: can do copy, move or link
695 (+ ?\x30 ; 30: drop site, but noop.
696 ?\x200)) ; 200: drop cancel.
697 2 my-byteorder))
698 (reply (append
699 (list
700 (+ ?\x80 ; 0x80 indicates a reply.
701 5) ; DROP_START.
702 my-byteorder)
703 reply-flags
704 x
705 y))
706 (timestamp (x-dnd-get-motif-value
707 data 4 4 source-byteorder))
708 action)
709
710 (x-send-client-message frame
711 dnd-source
712 frame
713 "_MOTIF_DRAG_AND_DROP_MESSAGE"
714 8
715 reply)
716 (setq action
717 (when (and reply-action atom-name)
718 (let* ((value (x-get-selection-internal
719 (intern atom-name)
720 (intern (x-dnd-current-type window)))))
721 (when value
722 (condition-case info
723 (x-dnd-drop-data event frame window value
724 (x-dnd-current-type window))
725 (error
726 (message "Error: %s" info)
727 nil))))))
728 (x-get-selection-internal
729 (intern atom-name)
730 (if action 'XmTRANSFER_SUCCESS 'XmTRANSFER_FAILURE)
731 timestamp)
732 (x-dnd-forget-drop frame)))
733
734 (t (error "Unknown Motif DND message %s %s" message-atom data)))))
735
736
737 ;;;
738
739 (provide 'x-dnd)
740
741 ;;; arch-tag: b621fb7e-50da-4323-850b-5fc71ae64621
742 ;;; x-dnd.el ends here