1 ;;; x-dnd.el --- drag and drop support for X.
3 ;; Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
5 ;; Author: Jan Dj
\e,Ad
\e(Brv <jan.h.d@swipnet.se>
7 ;; Keywords: window, drag, drop
9 ;; This file is part of GNU Emacs.
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)
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.
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.
28 ;; This file provides the drop part only. Currently supported protocols
29 ;; are XDND, Motif and the old KDE 1.x protocol.
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
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'."
55 (defcustom x-dnd-types-alist
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)
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 occurred, 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."
82 (defcustom x-dnd-known-types
88 "text/plain;charset=UTF-8"
89 "text/plain;charset=utf-8"
96 "The types accepted by default for dropped data.
97 The types are chosen in the order they appear in the list."
99 :type '(repeat string)
103 ;; Internal variables
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.")
118 (defvar x-dnd-empty-state [nil nil nil nil nil nil nil])
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-register-dnd-atom "DndProtocol" frame)
126 (x-register-dnd-atom "_MOTIF_DRAG_AND_DROP_MESSAGE" frame)
127 (x-register-dnd-atom "XdndEnter" frame)
128 (x-register-dnd-atom "XdndPosition" frame)
129 (x-register-dnd-atom "XdndLeave" frame)
130 (x-register-dnd-atom "XdndDrop" frame)
131 (x-dnd-init-xdnd-for-frame frame)
132 (x-dnd-init-motif-for-frame frame)))
134 (defun x-dnd-get-state-cons-for-frame (frame-or-window)
135 "Return the entry in x-dnd-current-state for a frame or window."
136 (let* ((frame (if (framep frame-or-window) frame-or-window
137 (window-frame frame-or-window)))
138 (display (frame-parameter frame 'display)))
139 (if (not (assoc display x-dnd-current-state))
140 (push (cons display (copy-sequence x-dnd-empty-state))
141 x-dnd-current-state))
142 (assoc display x-dnd-current-state)))
144 (defun x-dnd-get-state-for-frame (frame-or-window)
145 "Return the state in x-dnd-current-state for a frame or window."
146 (cdr (x-dnd-get-state-cons-for-frame frame-or-window)))
148 (defun x-dnd-default-test-function (window action types)
149 "The default test function for drag and drop.
150 WINDOW is where the mouse is when this function is called. It may be a frame
151 if the mouse is over the menu bar, scroll bar or tool bar.
152 ACTION is the suggested action from the source, and TYPES are the
153 types the drop data can have. This function only accepts drops with
154 types in `x-dnd-known-types'. It always returns the action private."
155 (let ((type (x-dnd-choose-type types)))
156 (when type (cons 'private type))))
159 (defun x-dnd-current-type (frame-or-window)
160 "Return the type we want the DND data to be in for the current drop.
161 FRAME-OR-WINDOW is the frame or window that the mouse is over."
162 (aref (x-dnd-get-state-for-frame frame-or-window) 4))
164 (defun x-dnd-forget-drop (frame-or-window)
165 "Remove all state for the last drop.
166 FRAME-OR-WINDOW is the frame or window that the mouse is over."
167 (setcdr (x-dnd-get-state-cons-for-frame frame-or-window)
168 (copy-sequence x-dnd-empty-state)))
170 (defun x-dnd-maybe-call-test-function (window action)
171 "Call `x-dnd-test-function' if something has changed.
172 WINDOW is the window the mouse is over. ACTION is the suggested
173 action from the source. If nothing has changed, return the last
174 action and type we got from `x-dnd-test-function'."
175 (let ((buffer (when (and (windowp window) (window-live-p window))
176 (window-buffer window)))
177 (current-state (x-dnd-get-state-for-frame window)))
178 (when (or (not (equal buffer (aref current-state 0)))
179 (not (equal window (aref current-state 1)))
180 (not (equal action (aref current-state 3))))
182 (when buffer (set-buffer buffer))
183 (let* ((action-type (funcall x-dnd-test-function
186 (aref current-state 2)))
187 (handler (cdr (assoc (cdr action-type) x-dnd-types-alist))))
188 ;; Ignore action-type if we have no handler.
190 (x-dnd-save-state window
192 (when handler action-type)))))))
193 (let ((current-state (x-dnd-get-state-for-frame window)))
194 (cons (aref current-state 5)
195 (aref current-state 4))))
197 (defun x-dnd-save-state (window action action-type &optional types extra-data)
198 "Save the state of the current drag and drop.
199 WINDOW is the window the mouse is over. ACTION is the action suggested
200 by the source. ACTION-TYPE is the result of calling `x-dnd-test-function'.
201 If given, TYPES are the types for the drop data that the source supports.
202 EXTRA-DATA is data needed for a specific protocol."
203 (let ((current-state (x-dnd-get-state-for-frame window)))
204 (aset current-state 5 (car action-type))
205 (aset current-state 4 (cdr action-type))
206 (aset current-state 3 action)
207 (when types (aset current-state 2 types))
208 (when extra-data (aset current-state 6 extra-data))
209 (aset current-state 1 window)
210 (aset current-state 0 (if (and (windowp window)
211 (window-live-p window))
212 (window-buffer window) nil))
213 (setcdr (x-dnd-get-state-cons-for-frame window) current-state)))
216 (defun x-dnd-handle-moz-url (window action data)
217 "Handle one item of type text/x-moz-url.
218 WINDOW is the window where the drop happened. ACTION is ignored.
219 DATA is the moz-url, which is formatted as two strings separated by \r\n.
220 The first string is the URL, the second string is the title of that URL.
221 DATA is encoded in utf-16. Decode the URL and call `x-dnd-handle-uri-list'."
222 ;; Mozilla and applications based on it (Galeon for example) uses
223 ;; text/unicode, but it is impossible to tell if it is le or be. Use what
224 ;; the machine Emacs runs on use. This looses if dropping between machines
225 ;; with different endian, but it is the best we can do.
226 (let* ((coding (if (eq (byteorder) ?B) 'utf-16be 'utf-16le))
227 (string (decode-coding-string data coding))
228 (strings (split-string string "[\r\n]" t))
229 ;; Can one drop more than one moz-url ?? Assume not.
231 (title (car (cdr strings))))
232 (x-dnd-handle-uri-list window action url)))
234 (defun x-dnd-insert-utf8-text (window action text)
235 "Decode the UTF-8 text and insert it at point.
236 TEXT is the text as a string, WINDOW is the window where the drop happened."
237 (dnd-insert-text window action (decode-coding-string text 'utf-8)))
239 (defun x-dnd-insert-utf16-text (window action text)
240 "Decode the UTF-16 text and insert it at point.
241 TEXT is the text as a string, WINDOW is the window where the drop happened."
242 ;; See comment in x-dnd-handle-moz-url about coding.
243 (let ((coding (if (eq (byteorder) ?B) 'utf-16be 'utf-16le)))
244 (dnd-insert-text window action (decode-coding-string text coding))))
246 (defun x-dnd-insert-ctext (window action text)
247 "Decode the compound text and insert it at point.
248 TEXT is the text as a string, WINDOW is the window where the drop happened."
249 (dnd-insert-text window action
250 (decode-coding-string text
251 'compound-text-with-extensions)))
253 (defun x-dnd-handle-uri-list (window action string)
254 "Split an uri-list into separate URIs and call `dnd-handle-one-url'.
255 WINDOW is the window where the drop happened.
256 STRING is the uri-list as a string. The URIs are separated by \r\n."
257 (let ((uri-list (split-string string "[\0\r\n]" t))
259 (dolist (bf uri-list)
260 ;; If one URL is handeled, treat as if the whole drop succeeded.
261 (let ((did-action (dnd-handle-one-url window action bf)))
262 (when did-action (setq retval did-action))))
265 (defun x-dnd-handle-file-name (window action string)
266 "Convert file names to URLs and call `dnd-handle-one-url'.
267 WINDOW is the window where the drop happened.
268 STRING is the file names as a string, separated by nulls."
269 (let ((uri-list (split-string string "[\0\r\n]" t))
270 (coding (and default-enable-multibyte-characters
271 (or file-name-coding-system
272 default-file-name-coding-system)))
274 (dolist (bf uri-list)
275 ;; If one URL is handeled, treat as if the whole drop succeeded.
276 (if coding (setq bf (encode-coding-string bf coding)))
277 (let* ((file-uri (concat "file://"
278 (mapconcat 'url-hexify-string
279 (split-string bf "/") "/")))
280 (did-action (dnd-handle-one-url window action file-uri)))
281 (when did-action (setq retval did-action))))
285 (defun x-dnd-choose-type (types &optional known-types)
286 "Choose which type we want to receive for the drop.
287 TYPES are the types the source of the drop offers, a vector of type names
288 as strings or symbols. Select among the types in `x-dnd-known-types' or
289 KNOWN-TYPES if given, and return that type name.
290 If no suitable type is found, return nil."
291 (let* ((known-list (or known-types x-dnd-known-types))
292 (first-known-type (car known-list))
294 (found (when first-known-type
296 (dotimes (i (length types-array))
297 (let* ((type (aref types-array i))
298 (typename (if (symbolp type)
299 (symbol-name type) type)))
300 (when (equal first-known-type typename)
301 (throw 'done first-known-type))))
304 (if (and (not found) (cdr known-list))
305 (x-dnd-choose-type types (cdr known-list))
308 (defun x-dnd-drop-data (event frame window data type)
309 "Drop one data item onto a frame.
310 EVENT is the client message for the drop, FRAME is the frame the drop occurred
311 on. WINDOW is the window of FRAME where the drop happened. DATA is the data
312 received from the source, and type is the type for DATA, see
313 `x-dnd-types-alist').
315 Returns the action used (move, copy, link, private) if drop was successful,
317 (let* ((type-info (assoc type x-dnd-types-alist))
318 (handler (cdr type-info))
319 (state (x-dnd-get-state-for-frame frame))
320 (action (aref state 5))
321 (w (posn-window (event-start event))))
323 (if (and (windowp w) (window-live-p w)
324 (not (window-minibuffer-p w))
325 (not (window-dedicated-p w)))
326 ;; If dropping in an ordinary window which we could use,
327 ;; let dnd-open-file-other-window specify what to do.
329 (when (not mouse-yank-at-point)
330 (goto-char (posn-point (event-start event))))
331 (funcall handler window action data))
332 ;; If we can't display the file here,
333 ;; make a new window for it.
334 (let ((dnd-open-file-other-window t))
336 (funcall handler window action data))))))
338 (defun x-dnd-handle-drag-n-drop-event (event)
339 "Receive drag and drop events (X client messages).
340 Currently XDND, Motif and old KDE 1.x protocols are recognized."
342 (let* ((client-message (car (cdr (cdr event))))
343 (window (posn-window (event-start event)))
344 (message-atom (aref client-message 0))
345 (frame (aref client-message 1))
346 (format (aref client-message 2))
347 (data (aref client-message 3)))
349 (cond ((equal "DndProtocol" message-atom) ; Old KDE 1.x.
350 (x-dnd-handle-old-kde event frame window message-atom format data))
352 ((equal "_MOTIF_DRAG_AND_DROP_MESSAGE" message-atom) ; Motif
353 (x-dnd-handle-motif event frame window message-atom format data))
355 ((and (> (length message-atom) 4) ; XDND protocol.
356 (equal "Xdnd" (substring message-atom 0 4)))
357 (x-dnd-handle-xdnd event frame window message-atom format data)))))
360 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
361 ;;; Old KDE protocol. Only dropping of files.
363 (defun x-dnd-handle-old-kde (event frame window message format data)
364 "Open the files in a KDE 1.x drop."
365 (let ((values (x-window-property "DndSelection" frame nil 0 t)))
366 (x-dnd-handle-uri-list window 'private
367 (replace-regexp-in-string "\0$" "" values))))
368 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
372 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
375 (defvar x-dnd-xdnd-to-action
376 '(("XdndActionPrivate" . private)
377 ("XdndActionCopy" . copy)
378 ("XdndActionMove" . move)
379 ("XdndActionLink" . link)
380 ("XdndActionAsk" . ask))
381 "Mapping from XDND action types to lisp symbols.")
383 (defun x-dnd-init-xdnd-for-frame (frame)
384 "Set the XdndAware property for FRAME to indicate that we do XDND."
385 (x-change-window-property "XdndAware"
386 '(5) ;; The version of XDND we support.
389 (defun x-dnd-get-drop-width-height (frame w accept)
390 "Return the widht/height to be sent in a XDndStatus message.
391 FRAME is the frame and W is the window where the drop happened.
392 If ACCEPT is nil return 0 (empty rectangle),
393 otherwise if W is a window, return its widht/height,
394 otherwise return the frame width/height."
396 (if (windowp w) ;; w is not a window if dropping on the menu bar,
397 ;; scroll bar or tool bar.
398 (let ((edges (window-inside-pixel-edges w)))
400 (- (nth 2 edges) (nth 0 edges)) ;; right - left
401 (- (nth 3 edges) (nth 1 edges)))) ;; bottom - top
402 (cons (frame-pixel-width frame)
403 (frame-pixel-height frame)))
406 (defun x-dnd-get-drop-x-y (frame w)
407 "Return the x/y coordinates to be sent in a XDndStatus message.
408 Coordinates are required to be absolute.
409 FRAME is the frame and W is the window where the drop happened.
410 If W is a window, return its absolute corrdinates,
411 otherwise return the frame coordinates."
412 (let* ((frame-left (frame-parameter frame 'left))
413 ;; If the frame is outside the display, frame-left looks like
414 ;; '(0 -16). Extract the -16.
415 (frame-real-left (if (consp frame-left) (car (cdr frame-left))
417 (frame-top (frame-parameter frame 'top))
418 (frame-real-top (if (consp frame-top) (car (cdr frame-top))
421 (let ((edges (window-inside-pixel-edges w)))
423 (+ frame-real-left (nth 0 edges))
424 (+ frame-real-top (nth 1 edges))))
425 (cons frame-real-left frame-real-top))))
427 (defun x-dnd-handle-xdnd (event frame window message format data)
428 "Receive one XDND event (client message) and send the appropriate reply.
429 EVENT is the client message. FRAME is where the mouse is now.
430 WINDOW is the window within FRAME where the mouse is now.
431 FORMAT is 32 (not used). MESSAGE is the data part of an XClientMessageEvent."
432 (cond ((equal "XdndEnter" message)
433 (let* ((flags (aref data 1))
434 (version (and (consp flags) (ash (car flags) -8)))
435 (more-than-3 (and (consp flags) (cdr flags)))
436 (dnd-source (aref data 0)))
437 (if version ;; If flags is bad, version will be nil.
440 (if (> more-than-3 0)
441 (x-window-property "XdndTypeList"
442 frame "AnyPropertyType"
444 (vector (x-get-atom-name (aref data 2))
445 (x-get-atom-name (aref data 3))
446 (x-get-atom-name (aref data 4))))))))
448 ((equal "XdndPosition" message)
449 (let* ((x (car (aref data 2)))
450 (y (cdr (aref data 2)))
451 (action (x-get-atom-name (aref data 4)))
452 (dnd-source (aref data 0))
453 (dnd-time (aref data 3))
454 (action-type (x-dnd-maybe-call-test-function
456 (cdr (assoc action x-dnd-xdnd-to-action))))
457 (reply-action (car (rassoc (car action-type)
458 x-dnd-xdnd-to-action)))
459 (accept ;; 1 = accept, 0 = reject
460 (if (and reply-action action-type) 1 0))
462 (list (string-to-number
463 (frame-parameter frame 'outer-window-id))
464 accept ;; 1 = Accept, 0 = reject.
465 (x-dnd-get-drop-x-y frame window)
466 (x-dnd-get-drop-width-height
467 frame window (eq accept 1))
470 (x-send-client-message
471 frame dnd-source frame "XdndStatus" 32 list-to-send)
474 ((equal "XdndLeave" message)
475 (x-dnd-forget-drop window))
477 ((equal "XdndDrop" message)
478 (if (windowp window) (select-window window))
479 (let* ((dnd-source (aref data 0))
480 (value (and (x-dnd-current-type window)
481 (x-get-selection-internal
483 (intern (x-dnd-current-type window)))))
484 success action ret-action)
486 (setq action (if value
488 (x-dnd-drop-data event frame window value
489 (x-dnd-current-type window))
491 (message "Error: %s" info)
494 (setq success (if action 1 0))
497 (or (car (rassoc action x-dnd-xdnd-to-action))
501 (x-send-client-message
502 frame dnd-source frame "XdndFinished" 32
503 (list (string-to-number (frame-parameter frame 'outer-window-id))
504 success ;; 1 = Success, 0 = Error
505 (if success "XdndActionPrivate" 0)
507 (x-dnd-forget-drop window)))
509 (t (error "Unknown XDND message %s %s" message data))))
511 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
514 (defun x-dnd-init-motif-for-frame (frame)
515 "Set _MOTIF_DRAG_RECEIVER_INFO for FRAME to indicate that we do Motif DND."
516 (x-change-window-property "_MOTIF_DRAG_RECEIVER_INFO"
519 0 ; The Motif DND version.
520 5 ; We want drag dynamic.
522 0 0 0 0 0 0) ; Property must be 16 bytes.
523 frame "_MOTIF_DRAG_RECEIVER_INFO" 8 t))
525 (defun x-dnd-get-motif-value (data offset size byteorder)
527 (if (eq byteorder ?l)
528 (+ (ash (aref data (1+ offset)) 8)
530 (+ (ash (aref data offset) 8)
531 (aref data (1+ offset)))))
534 (if (eq byteorder ?l)
535 (cons (+ (ash (aref data (+ 3 offset)) 8)
536 (aref data (+ 2 offset)))
537 (+ (ash (aref data (1+ offset)) 8)
539 (cons (+ (ash (aref data offset) 8)
540 (aref data (1+ offset)))
541 (+ (ash (aref data (+ 2 offset)) 8)
542 (aref data (+ 3 offset))))))))
544 (defun x-dnd-motif-value-to-list (value size byteorder)
545 (let ((bytes (cond ((eq size 2)
546 (list (logand (lsh value -8) ?\xff)
547 (logand value ?\xff)))
551 (list (logand (lsh (car value) -8) ?\xff)
552 (logand (car value) ?\xff)
553 (logand (lsh (cdr value) -8) ?\xff)
554 (logand (cdr value) ?\xff))
555 (list (logand (lsh value -24) ?\xff)
556 (logand (lsh value -16) ?\xff)
557 (logand (lsh value -8) ?\xff)
558 (logand value ?\xff)))))))
559 (if (eq byteorder ?l)
564 (defvar x-dnd-motif-message-types
565 '((0 . XmTOP_LEVEL_ENTER)
566 (1 . XmTOP_LEVEL_LEAVE)
568 (3 . XmDROP_SITE_ENTER)
569 (4 . XmDROP_SITE_LEAVE)
572 (7 . XmDRAG_DROP_FINISH)
573 (8 . XmOPERATION_CHANGED))
574 "Mapping from numbers to Motif DND message types.")
576 (defvar x-dnd-motif-to-action
579 (3 . link) ; Both 3 and 4 has been seen as link.
581 (2 . private)) ; Motif does not have private, so use copy for private.
582 "Mapping from number to operation for Motif DND.")
584 (defun x-dnd-handle-motif (event frame window message-atom format data)
585 (let* ((message-type (cdr (assoc (aref data 0) x-dnd-motif-message-types)))
586 (source-byteorder (aref data 1))
587 (my-byteorder (byteorder))
588 (source-flags (x-dnd-get-motif-value data 2 2 source-byteorder))
589 (source-action (cdr (assoc (logand ?\xF source-flags)
590 x-dnd-motif-to-action))))
592 (cond ((eq message-type 'XmTOP_LEVEL_ENTER)
593 (let* ((dnd-source (x-dnd-get-motif-value
594 data 8 4 source-byteorder))
595 (selection-atom (x-dnd-get-motif-value
596 data 12 4 source-byteorder))
597 (atom-name (x-get-atom-name selection-atom))
598 (types (when atom-name
599 (x-get-selection-internal (intern atom-name)
601 (x-dnd-forget-drop frame)
602 (when types (x-dnd-save-state window nil nil
606 ;; Can not forget drop here, LEAVE comes before DROP_START and
607 ;; we need the state in DROP_START.
608 ((eq message-type 'XmTOP_LEVEL_LEAVE)
611 ((eq message-type 'XmDRAG_MOTION)
612 (let* ((state (x-dnd-get-state-for-frame frame))
613 (timestamp (x-dnd-motif-value-to-list
614 (x-dnd-get-motif-value data 4 4
617 (x (x-dnd-motif-value-to-list
618 (x-dnd-get-motif-value data 8 2 source-byteorder)
620 (y (x-dnd-motif-value-to-list
621 (x-dnd-get-motif-value data 10 2 source-byteorder)
623 (dnd-source (aref state 6))
624 (first-move (not (aref state 3)))
625 (action-type (x-dnd-maybe-call-test-function
628 (reply-action (car (rassoc (car action-type)
629 x-dnd-motif-to-action)))
631 (x-dnd-motif-value-to-list
634 ?\x30 ; 30: valid drop site
635 ?\x700) ; 700: can do copy, move or link
636 ?\x30) ; 30: drop site, but noop.
640 (+ ?\x80 ; 0x80 indicates a reply.
642 3 ; First time, reply is SITE_ENTER.
643 2)) ; Not first time, reply is DRAG_MOTION.
649 (x-send-client-message frame
652 "_MOTIF_DRAG_AND_DROP_MESSAGE"
656 ((eq message-type 'XmOPERATION_CHANGED)
657 (let* ((state (x-dnd-get-state-for-frame frame))
658 (timestamp (x-dnd-motif-value-to-list
659 (x-dnd-get-motif-value data 4 4 source-byteorder)
661 (dnd-source (aref state 6))
662 (action-type (x-dnd-maybe-call-test-function
665 (reply-action (car (rassoc (car action-type)
666 x-dnd-motif-to-action)))
668 (x-dnd-motif-value-to-list
671 ?\x30 ; 30: valid drop site
672 ?\x700) ; 700: can do copy, move or link
673 ?\x30) ; 30: drop site, but noop
677 (+ ?\x80 ; 0x80 indicates a reply.
678 8) ; 8 is OPERATION_CHANGED
682 (x-send-client-message frame
685 "_MOTIF_DRAG_AND_DROP_MESSAGE"
689 ((eq message-type 'XmDROP_START)
690 (let* ((x (x-dnd-motif-value-to-list
691 (x-dnd-get-motif-value data 8 2 source-byteorder)
693 (y (x-dnd-motif-value-to-list
694 (x-dnd-get-motif-value data 10 2 source-byteorder)
696 (selection-atom (x-dnd-get-motif-value
697 data 12 4 source-byteorder))
698 (atom-name (x-get-atom-name selection-atom))
699 (dnd-source (x-dnd-get-motif-value
700 data 16 4 source-byteorder))
701 (action-type (x-dnd-maybe-call-test-function
704 (reply-action (car (rassoc (car action-type)
705 x-dnd-motif-to-action)))
707 (x-dnd-motif-value-to-list
710 ?\x30 ; 30: valid drop site
711 ?\x700) ; 700: can do copy, move or link
712 (+ ?\x30 ; 30: drop site, but noop.
713 ?\x200)) ; 200: drop cancel.
717 (+ ?\x80 ; 0x80 indicates a reply.
723 (timestamp (x-dnd-get-motif-value
724 data 4 4 source-byteorder))
727 (x-send-client-message frame
730 "_MOTIF_DRAG_AND_DROP_MESSAGE"
734 (when (and reply-action atom-name)
735 (let* ((value (x-get-selection-internal
737 (intern (x-dnd-current-type window)))))
740 (x-dnd-drop-data event frame window value
741 (x-dnd-current-type window))
743 (message "Error: %s" info)
745 (x-get-selection-internal
747 (if action 'XmTRANSFER_SUCCESS 'XmTRANSFER_FAILURE)
749 (x-dnd-forget-drop frame)))
751 (t (error "Unknown Motif DND message %s %s" message-atom data)))))
758 ;;; arch-tag: b621fb7e-50da-4323-850b-5fc71ae64621
759 ;;; x-dnd.el ends here