1 ;;; x-dnd.el --- drag and drop support for X.
4 ;; Free Software Foundation, Inc.
6 ;; Author: Jan Dj\e,Ad\e(Brv <jan.h.d@swipnet.se>
8 ;; Keywords: window, drag, drop
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software; you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation; either version 2, or (at your option)
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
25 ;; Boston, MA 02111-1307, USA.
29 ;; This file provides the drop part only. Currently supported protocols
30 ;; are XDND and the old KDE 1.x protocol.
34 ;;; Customizable variables
37 (defcustom x-dnd-test-function
'x-dnd-default-test-function
38 "The function drag and drop uses to determine if to accept or reject a drop.
39 The function takes three arguments, WINDOW ACTION and TYPES.
40 WINDOW is where the mouse is when the function is called. WINDOW may be a
41 frame if the mouse isn't over a real window (i.e. menu bar, tool bar or
42 scroll bar). ACTION is the suggested action from the drag and drop source,
43 one of the symbols move, copy link or ask. TYPES is a list of available types
46 The function shall return nil to reject the drop or a cons with two values,
47 the wanted action as car and the wanted type as cdr. The wanted action
48 can be copy, move, link, ask or private.
49 The default value for this variable is `x-dnd-default-test-function'."
53 (defcustom x-dnd-protocol-alist
55 ("^file:///" . x-dnd-open-local-file
) ; XDND format.
56 ("^file://" . x-dnd-open-file
) ; URL with host
57 ("^file:" . x-dnd-open-local-file
) ; Old KDE, Motif, Sun
60 "The functions to call for different protocols when a drop is made.
61 This variable is used by `x-dnd-handle-uri-list' and `x-dnd-handle-moz-url'.
62 The list contains of (REGEXP . FUNCTION) pairs.
63 The functions shall take two arguments, URL, which is the URL dropped and
64 ACTION which is the action to be performed for the drop (move, copy, link,
66 If no match is found here, and the value of `browse-url-browser-function'
67 is a pair of (REGEXP . FUNCTION), those regexps are tried for a match.
68 Insertion of text is not handeled by these functions, see `x-dnd-types-alist'
70 The function shall return the action done (move, copy, link or private)
71 if some action was made, or nil if the URL is ignored."
76 (defcustom x-dnd-types-alist
78 ("text/uri-list" . x-dnd-handle-uri-list
)
79 ("text/x-moz-url" . x-dnd-handle-moz-url
)
80 ("_NETSCAPE_URL" . x-dnd-handle-uri-list
)
81 ("FILE_NAME" . x-dnd-handle-file-name
)
82 ("UTF8_STRING" . x-dnd-insert-utf8-text
)
83 ("text/plain;charset=UTF-8" . x-dnd-insert-utf8-text
)
84 ("text/plain;charset=utf-8" . x-dnd-insert-utf8-text
)
85 ("text/unicode" . x-dnd-insert-utf16-text
)
86 ("text/plain" . x-dnd-insert-text
)
87 ("COMPOUND_TEXT" . x-dnd-insert-ctext
)
88 ("STRING" . x-dnd-insert-text
)
89 ("TEXT" . x-dnd-insert-text
)
91 "Which function to call to handle a drop of that type.
92 If the type for the drop is not present, or the function is nil,
93 the drop is rejected. The function takes three arguments, WINDOW, ACTION
94 and DATA. WINDOW is where the drop occured, ACTION is the action for
95 this drop (copy, move, link, private or ask) as determined by a previous
96 call to `x-dnd-test-function'. DATA is the drop data.
97 The function shall return the action used (copy, move, link or private) if drop
98 is successful, nil if not."
102 (defcustom x-dnd-open-file-other-window nil
103 "If non-nil, always use find-file-other-window to open dropped files."
107 ;; Internal variables
109 (defvar x-dnd-known-types
115 "text/plain;charset=UTF-8"
116 "text/plain;charset=utf-8"
123 "The types accepted by default for dropped data.
124 The types are chosen in the order they appear in the list.")
126 (defvar x-dnd-current-state nil
127 "The current state for a drop.
128 This is an alist with one entry for each display. The value for each display
129 is a vector that contains the state for drag and drop for that display.
130 Elements in the vector are:
131 Last buffer drag was in,
132 last window drag was in,
133 types available for drop,
134 the action suggested by the source,
135 the type we want for the drop,
136 the action we want for the drop,
137 any protocol specific data.")
139 (defvar x-dnd-empty-state
[nil nil nil nil nil nil nil
])
143 (defun x-dnd-init-frame (&optional frame
)
144 "Setup drag and drop for FRAME (i.e. create appropriate properties)."
145 (x-dnd-init-xdnd-for-frame frame
)
146 (x-dnd-init-motif-for-frame frame
))
148 (defun x-dnd-get-state-cons-for-frame (frame-or-window)
149 "Return the entry in x-dnd-current-state for a frame or window."
150 (let* ((frame (if (framep frame-or-window
) frame-or-window
151 (window-frame frame-or-window
)))
152 (display (frame-parameter frame
'display
)))
153 (if (not (assoc display x-dnd-current-state
))
154 (push (cons display
(copy-sequence x-dnd-empty-state
))
155 x-dnd-current-state
))
156 (assoc display x-dnd-current-state
)))
158 (defun x-dnd-get-state-for-frame (frame-or-window)
159 "Return the state in x-dnd-current-state for a frame or window."
160 (cdr (x-dnd-get-state-cons-for-frame frame-or-window
)))
162 (defun x-dnd-default-test-function (window action types
)
163 "The default test function for drag and drop.
164 WINDOW is where the mouse is when this function is called. It may be a frame
165 if the mouse is over the menu bar, scroll bar or tool bar.
166 ACTION is the suggested action from the source, and TYPES are the
167 types the drop data can have. This function only accepts drops with
168 types in `x-dnd-known-types'. It always returns the action private."
169 (let ((type (x-dnd-choose-type types
)))
170 (when type
(cons 'private type
))))
173 (defun x-dnd-current-type (frame-or-window)
174 "Return the type we want the DND data to be in for the current drop.
175 FRAME-OR-WINDOW is the frame or window that the mouse is over."
176 (aref (x-dnd-get-state-for-frame frame-or-window
) 4))
178 (defun x-dnd-forget-drop (frame-or-window)
179 "Remove all state for the last drop.
180 FRAME-OR-WINDOW is the frame or window that the mouse is over."
181 (setcdr (x-dnd-get-state-cons-for-frame frame-or-window
)
182 (copy-sequence x-dnd-empty-state
)))
184 (defun x-dnd-maybe-call-test-function (window action
)
185 "Call `x-dnd-test-function' if something has changed.
186 WINDOW is the window the mouse is over. ACTION is the suggested
187 action from the source. If nothing has changed, return the last
188 action and type we got from `x-dnd-test-function'."
189 (let ((buffer (when (and (windowp window
) (window-live-p window
))
190 (window-buffer window
)))
191 (current-state (x-dnd-get-state-for-frame window
)))
192 (when (or (not (equal buffer
(aref current-state
0)))
193 (not (equal window
(aref current-state
1)))
194 (not (equal action
(aref current-state
3))))
196 (when buffer
(set-buffer buffer
))
197 (let* ((action-type (funcall x-dnd-test-function
200 (aref current-state
2)))
201 (handler (cdr (assoc (cdr action-type
) x-dnd-types-alist
))))
202 ;; Ignore action-type if we have no handler.
204 (x-dnd-save-state window
206 (when handler action-type
)))))))
207 (let ((current-state (x-dnd-get-state-for-frame window
)))
208 (cons (aref current-state
5)
209 (aref current-state
4))))
211 (defun x-dnd-save-state (window action action-type
&optional types extra-data
)
212 "Save the state of the current drag and drop.
213 WINDOW is the window the mouse is over. ACTION is the action suggested
214 by the source. ACTION-TYPE is the result of calling `x-dnd-test-function'.
215 If given, TYPES are the types for the drop data that the source supports.
216 EXTRA-DATA is data needed for a specific protocol."
217 (let ((current-state (x-dnd-get-state-for-frame window
)))
218 (aset current-state
5 (car action-type
))
219 (aset current-state
4 (cdr action-type
))
220 (aset current-state
3 action
)
221 (when types
(aset current-state
2 types
))
222 (when extra-data
(aset current-state
6 extra-data
))
223 (aset current-state
1 window
)
224 (aset current-state
0 (if (and (windowp window
)
225 (window-live-p window
))
226 (window-buffer window
) nil
))
227 (setcdr (x-dnd-get-state-cons-for-frame window
) current-state
)))
230 (defun x-dnd-handle-one-url (window action arg
)
231 "Handle one dropped url by calling the appropriate handler.
232 The handler is first localted by looking at `x-dnd-protocol-alist'.
233 If no match is found here, and the value of `browse-url-browser-function'
234 is a pair of (REGEXP . FUNCTION), those regexps are tried for a match.
235 If no match is found, just call `x-dnd-insert-text'.
236 WINDOW is where the drop happend, ACTION is the action for the drop,
237 ARG is the URL that has been dropped.
239 (require 'browse-url
)
240 (let* ((uri (replace-regexp-in-string
243 (format "%c" (string-to-number (substring arg
1) 16)))
248 (dolist (bf x-dnd-protocol-alist
)
249 (when (string-match (car bf
) uri
)
250 (setq ret
(funcall (cdr bf
) uri action
))
253 (when (not (functionp browse-url-browser-function
))
255 (dolist (bf browse-url-browser-function
)
256 (when (string-match (car bf
) uri
)
258 (funcall (cdr bf
) uri action
)
262 (x-dnd-insert-text window action uri
)
263 (setq ret
'private
)))
267 (defun x-dnd-get-local-file-uri (uri)
268 "Return an uri converted to file:/// syntax if uri is a local file.
269 Return nil if URI is not a local file."
271 ;; The hostname may be our hostname, in that case, convert to a local
272 ;; file. Otherwise return nil. TODO: How about an IP-address as hostname?
273 (let ((hostname (when (string-match "^file://\\([^/]*\\)" uri
)
274 (downcase (match-string 1 uri
))))
276 (downcase (if (string-match "^[^\\.]+" system-name
)
277 (match-string 0 system-name
)
280 (or (string-equal "localhost" hostname
)
281 (string-equal (downcase system-name
) hostname
)
282 (string-equal system-name-no-dot hostname
)))
283 (concat "file://" (substring uri
(+ 7 (length hostname
)))))))
285 (defun x-dnd-get-local-file-name (uri &optional must-exist
)
286 "Return file name converted from file:/// or file: syntax.
287 URI is the uri for the file. If MUST-EXIST is given and non-nil,
288 only return non-nil if the file exists.
289 Return nil if URI is not a local file."
290 (let ((f (cond ((string-match "^file:///" uri
) ; XDND format.
291 (substring uri
(1- (match-end 0))))
292 ((string-match "^file:" uri
) ; Old KDE, Motif, Sun
293 (substring uri
(match-end 0))))))
294 (when (and f must-exist
)
295 (let* ((decoded-f (decode-coding-string
297 (or file-name-coding-system
298 default-file-name-coding-system
)))
299 (try-f (if (file-readable-p decoded-f
) decoded-f f
)))
300 (when (file-readable-p try-f
) try-f
)))))
303 (defun x-dnd-open-local-file (uri action
)
305 The file is opened in the current window, or a new window if
306 `x-dnd-open-file-other-window' is set. URI is the url for the file,
307 and must have the format file:file-name or file:///file-name.
308 The last / in file:/// is part of the file name. ACTION is ignored."
310 (let* ((f (x-dnd-get-local-file-name uri t
)))
312 (if (file-readable-p f
)
314 (if x-dnd-open-file-other-window
315 (find-file-other-window f
)
318 (error "Can not read %s (%s)" f uri
)))))
320 (defun x-dnd-open-file (uri action
)
321 "Open a local or remote file.
322 The file is opened in the current window, or a new window if
323 `x-dnd-open-file-other-window' is set. URI is the url for the file,
324 and must have the format file://hostname/file-name. ACTION is ignored.
325 The last / in file://hostname/ is part of the file name."
327 ;; The hostname may be our hostname, in that case, convert to a local
328 ;; file. Otherwise return nil.
329 (let ((local-file (x-dnd-get-local-file-uri uri
)))
330 (when local-file
(x-dnd-open-local-file local-file action
))))
333 (defun x-dnd-handle-moz-url (window action data
)
334 "Handle one item of type text/x-moz-url.
335 WINDOW is the window where the drop happened. ACTION is ignored.
336 DATA is the moz-url, which is formatted as two strings separated by \r\n.
337 The first string is the URL, the second string is the title of that URL.
338 DATA is encoded in utf-16. Decode the URL and call `x-dnd-handle-uri-list'."
339 (let* ((string (decode-coding-string data
'utf-16le
)) ;; ALWAYS LE???
340 (strings (split-string string
"[\r\n]" t
))
341 ;; Can one drop more than one moz-url ?? Assume not.
343 (title (car (cdr strings
))))
344 (x-dnd-handle-uri-list window action url
)))
346 (defun x-dnd-insert-utf8-text (window action text
)
347 "Decode the UTF-8 text and insert it at point.
348 TEXT is the text as a string, WINDOW is the window where the drop happened."
349 (x-dnd-insert-text window action
(decode-coding-string text
'utf-8
)))
351 (defun x-dnd-insert-utf16-text (window action text
)
352 "Decode the UTF-16 text and insert it at point.
353 TEXT is the text as a string, WINDOW is the window where the drop happened."
354 (x-dnd-insert-text window action
(decode-coding-string text
'utf-16le
)))
356 (defun x-dnd-insert-ctext (window action text
)
357 "Decode the compound text and insert it at point.
358 TEXT is the text as a string, WINDOW is the window where the drop happened."
359 (x-dnd-insert-text window action
360 (decode-coding-string text
361 'compound-text-with-extensions
)))
363 (defun x-dnd-insert-text (window action text
)
364 "Insert text at point or push to the kill ring if buffer is read only.
365 TEXT is the text as a string, WINDOW is the window where the drop happened."
366 (if (or buffer-read-only
367 (not (windowp window
)))
371 (substitute-command-keys
372 "The dropped text can be accessed with \\[yank]")))
376 (defun x-dnd-handle-uri-list (window action string
)
377 "Split an uri-list into separate URIs and call `x-dnd-handle-one-url'.
378 WINDOW is the window where the drop happened.
379 STRING is the uri-list as a string. The URIs are separated by \r\n."
380 (let ((uri-list (split-string string
"[\0\r\n]" t
))
382 (dolist (bf uri-list
)
383 ;; If one URL is handeled, treat as if the whole drop succeeded.
384 (let ((did-action (x-dnd-handle-one-url window action bf
)))
385 (when did-action
(setq retval did-action
))))
388 (defun x-dnd-handle-file-name (window action string
)
389 "Prepend file:// to file names and call `x-dnd-handle-one-url'.
390 WINDOW is the window where the drop happened.
391 STRING is the file names as a string, separated by nulls."
392 (let ((uri-list (split-string string
"[\0\r\n]" t
))
394 (dolist (bf uri-list
)
395 ;; If one URL is handeled, treat as if the whole drop succeeded.
396 (let* ((file-uri (concat "file://" bf
))
397 (did-action (x-dnd-handle-one-url window action file-uri
)))
398 (when did-action
(setq retval did-action
))))
402 (defun x-dnd-choose-type (types &optional known-types
)
403 "Choose which type we want to receive for the drop.
404 TYPES are the types the source of the drop offers, a vector of type names
405 as strings or symbols. Select among the types in `x-dnd-known-types' or
406 KNOWN-TYPES if given, and return that type name.
407 If no suitable type is found, return nil."
408 (let* ((known-list (or known-types x-dnd-known-types
))
409 (first-known-type (car known-list
))
411 (found (when first-known-type
413 (dotimes (i (length types-array
))
414 (let* ((type (aref types-array i
))
415 (typename (if (symbolp type
)
416 (symbol-name type
) type
)))
417 (when (equal first-known-type typename
)
418 (throw 'done first-known-type
))))
421 (if (and (not found
) (cdr known-list
))
422 (x-dnd-choose-type types
(cdr known-list
))
425 (defun x-dnd-drop-data (event frame window data type
)
426 "Drop one data item onto a frame.
427 EVENT is the client message for the drop, FRAME is the frame the drop occurred
428 on. WINDOW is the window of FRAME where the drop happened. DATA is the data
429 received from the source, and type is the type for DATA, see
430 `x-dnd-types-alist').
432 Returns the action used (move, copy, link, private) if drop was successful,
434 (let* ((type-info (assoc type x-dnd-types-alist
))
435 (handler (cdr type-info
))
436 (state (x-dnd-get-state-for-frame frame
))
437 (action (aref state
5))
438 (w (posn-window (event-start event
))))
440 (if (and (windowp w
) (window-live-p w
))
441 ;; If dropping in a window, open files in that window rather
442 ;; than in a new widow.
443 (let ((x-dnd-open-file-other-window nil
))
444 (goto-char (posn-point (event-start event
)))
445 (funcall handler window action data
))
446 (let ((x-dnd-open-file-other-window t
)) ;; Dropping on non-window.
448 (funcall handler window action data
))))))
450 (defun x-dnd-handle-drag-n-drop-event (event)
451 "Receive drag and drop events (X client messages).
452 Currently XDND and old KDE 1.x protocols are recognized.
453 TODO: Add Motif and OpenWindows."
455 (let* ((client-message (car (cdr (cdr event
))))
456 (window (posn-window (event-start event
)))
457 (message-atom (aref client-message
0))
458 (frame (aref client-message
1))
459 (format (aref client-message
2))
460 (data (aref client-message
3)))
462 (cond ((equal "DndProtocol" message-atom
) ; Old KDE 1.x.
463 (x-dnd-handle-old-kde event frame window message-atom format data
))
465 ((equal "_MOTIF_DRAG_AND_DROP_MESSAGE" message-atom
) ; Motif
466 (x-dnd-handle-motif event frame window message-atom format data
))
468 ((and (> (length message-atom
) 4) ; XDND protocol.
469 (equal "Xdnd" (substring message-atom
0 4)))
470 (x-dnd-handle-xdnd event frame window message-atom format data
)))))
473 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
474 ;;; Old KDE protocol. Only dropping of files.
476 (defun x-dnd-handle-old-kde (event frame window message format data
)
477 "Open the files in a KDE 1.x drop."
478 (let ((values (x-window-property "DndSelection" frame nil
0 t
)))
479 (x-dnd-handle-uri-list window
'private
480 (replace-regexp-in-string "\0$" "" values
))))
481 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
485 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
488 (defvar x-dnd-xdnd-to-action
489 '(("XdndActionPrivate" . private
)
490 ("XdndActionCopy" . copy
)
491 ("XdndActionMove" . move
)
492 ("XdndActionLink" . link
)
493 ("XdndActionAsk" . ask
))
494 "Mapping from XDND action types to lisp symbols.")
496 (defun x-dnd-init-xdnd-for-frame (frame)
497 "Set the XdndAware property for FRAME to indicate that we do XDND."
498 (x-change-window-property "XdndAware"
499 '(5) ;; The version of XDND we support.
502 (defun x-dnd-get-drop-width-height (frame w accept
)
503 "Return the widht/height to be sent in a XDndStatus message.
504 FRAME is the frame and W is the window where the drop happened.
505 If ACCEPT is nil return 0 (empty rectangle),
506 otherwise if W is a window, return its widht/height,
507 otherwise return the frame width/height."
509 (if (windowp w
) ;; w is not a window if dropping on the menu bar,
510 ;; scroll bar or tool bar.
511 (let ((edges (window-inside-pixel-edges w
)))
513 (- (nth 2 edges
) (nth 0 edges
)) ;; right - left
514 (- (nth 3 edges
) (nth 1 edges
)))) ;; bottom - top
515 (cons (frame-pixel-width frame
)
516 (frame-pixel-height frame
)))
519 (defun x-dnd-get-drop-x-y (frame w
)
520 "Return the x/y coordinates to be sent in a XDndStatus message.
521 Coordinates are required to be absolute.
522 FRAME is the frame and W is the window where the drop happened.
523 If W is a window, return its absolute corrdinates,
524 otherwise return the frame coordinates."
525 (let* ((frame-left (frame-parameter frame
'left
))
526 ;; If the frame is outside the display, frame-left looks like
527 ;; '(0 -16). Extract the -16.
528 (frame-real-left (if (consp frame-left
) (car (cdr frame-left
))
530 (frame-top (frame-parameter frame
'top
))
531 (frame-real-top (if (consp frame-top
) (car (cdr frame-top
))
534 (let ((edges (window-inside-pixel-edges w
)))
536 (+ frame-real-left
(nth 0 edges
))
537 (+ frame-real-top
(nth 1 edges
))))
538 (cons frame-real-left frame-real-top
))))
540 (defun x-dnd-handle-xdnd (event frame window message format data
)
541 "Receive one XDND event (client message) and send the appropriate reply.
542 EVENT is the client message. FRAME is where the mouse is now.
543 WINDOW is the window within FRAME where the mouse is now.
544 FORMAT is 32 (not used). MESSAGE is the data part of an XClientMessageEvent."
545 (cond ((equal "XdndEnter" message
)
546 (let ((version (ash (car (aref data
1)) -
8))
547 (more-than-3 (cdr (aref data
1)))
548 (dnd-source (aref data
0)))
551 (if (> more-than-3
0)
552 (x-window-property "XdndTypeList"
553 frame
"AnyPropertyType"
555 (vector (x-get-atom-name (aref data
2))
556 (x-get-atom-name (aref data
3))
557 (x-get-atom-name (aref data
4)))))))
559 ((equal "XdndPosition" message
)
560 (let* ((x (car (aref data
2)))
561 (y (cdr (aref data
2)))
562 (action (x-get-atom-name (aref data
4)))
563 (dnd-source (aref data
0))
564 (dnd-time (aref data
3))
565 (action-type (x-dnd-maybe-call-test-function
567 (cdr (assoc action x-dnd-xdnd-to-action
))))
568 (reply-action (car (rassoc (car action-type
)
569 x-dnd-xdnd-to-action
)))
570 (accept ;; 1 = accept, 0 = reject
571 (if (and reply-action action-type
) 1 0))
573 (list (string-to-number
574 (frame-parameter frame
'outer-window-id
))
575 accept
;; 1 = Accept, 0 = reject.
576 (x-dnd-get-drop-x-y frame window
)
577 (x-dnd-get-drop-width-height
578 frame window
(eq accept
1))
581 (x-send-client-message
582 frame dnd-source frame
"XdndStatus" 32 list-to-send
)
585 ((equal "XdndLeave" message
)
586 (x-dnd-forget-drop window
))
588 ((equal "XdndDrop" message
)
589 (if (windowp window
) (select-window window
))
590 (let* ((dnd-source (aref data
0))
591 (value (and (x-dnd-current-type window
)
592 (x-get-selection-internal
594 (intern (x-dnd-current-type window
)))))
595 success action ret-action
)
597 (setq action
(if value
599 (x-dnd-drop-data event frame window value
600 (x-dnd-current-type window
))
602 (message "Error: %s" info
)
605 (setq success
(if action
1 0))
608 (or (car (rassoc action x-dnd-xdnd-to-action
))
612 (x-send-client-message
613 frame dnd-source frame
"XdndFinished" 32
614 (list (string-to-number (frame-parameter frame
'outer-window-id
))
615 success
;; 1 = Success, 0 = Error
616 (if success
"XdndActionPrivate" 0)
618 (x-dnd-forget-drop window
)))
620 (t (error "Unknown XDND message %s %s" message data
))))
622 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
625 (defun x-dnd-init-motif-for-frame (frame)
626 "Set _MOTIF_DRAG_RECEIVER_INFO for FRAME to indicate that we do Motif DND."
627 (x-change-window-property "_MOTIF_DRAG_RECEIVER_INFO"
630 0 ; The Motif DND version.
631 5 ; We want drag dynamic.
633 0 0 0 0 0 0) ; Property must be 16 bytes.
634 frame
"_MOTIF_DRAG_RECEIVER_INFO" 8 t
))
636 (defun x-dnd-get-motif-value (data offset size byteorder
)
638 (if (eq byteorder ?l
)
639 (+ (ash (aref data
(1+ offset
)) 8)
641 (+ (ash (aref data offset
) 8)
642 (aref data
(1+ offset
)))))
645 (if (eq byteorder ?l
)
646 (cons (+ (ash (aref data
(+ 3 offset
)) 8)
647 (aref data
(+ 2 offset
)))
648 (+ (ash (aref data
(1+ offset
)) 8)
650 (cons (+ (ash (aref data offset
) 8)
651 (aref data
(1+ offset
)))
652 (+ (ash (aref data
(+ 2 offset
)) 8)
653 (aref data
(+ 3 offset
))))))))
655 (defun x-dnd-motif-value-to-list (value size byteorder
)
656 (let ((bytes (cond ((eq size
2)
657 (list (logand (lsh value -
8) ?
\xff)
658 (logand value ?
\xff)))
662 (list (logand (lsh (car value
) -
8) ?
\xff)
663 (logand (car value
) ?
\xff)
664 (logand (lsh (cdr value
) -
8) ?
\xff)
665 (logand (cdr value
) ?
\xff))
666 (list (logand (lsh value -
24) ?
\xff)
667 (logand (lsh value -
16) ?
\xff)
668 (logand (lsh value -
8) ?
\xff)
669 (logand value ?
\xff)))))))
670 (if (eq byteorder ?l
)
675 (defvar x-dnd-motif-message-types
676 '((0 . XmTOP_LEVEL_ENTER
)
677 (1 . XmTOP_LEVEL_LEAVE
)
679 (3 . XmDROP_SITE_ENTER
)
680 (4 . XmDROP_SITE_LEAVE
)
683 (7 . XmDRAG_DROP_FINISH
)
684 (8 . XmOPERATION_CHANGED
))
685 "Mapping from numbers to Motif DND message types.")
687 (defvar x-dnd-motif-to-action
690 (3 . link
) ; Both 3 and 4 has been seen as link.
692 (2 . private
)) ; Motif does not have private, so use copy for private.
693 "Mapping from number to operation for Motif DND.")
695 (defun x-dnd-handle-motif (event frame window message-atom format data
)
696 (let* ((message-type (cdr (assoc (aref data
0) x-dnd-motif-message-types
)))
697 (source-byteorder (aref data
1))
698 (my-byteorder (byteorder))
699 (source-flags (x-dnd-get-motif-value data
2 2 source-byteorder
))
700 (source-action (cdr (assoc (logand ?\xF source-flags
)
701 x-dnd-motif-to-action
))))
703 (cond ((eq message-type
'XmTOP_LEVEL_ENTER
)
704 (let* ((dnd-source (x-dnd-get-motif-value
705 data
8 4 source-byteorder
))
706 (selection-atom (x-dnd-get-motif-value
707 data
12 4 source-byteorder
))
708 (atom-name (x-get-atom-name selection-atom
))
709 (types (when atom-name
710 (x-get-selection-internal (intern atom-name
)
712 (x-dnd-forget-drop frame
)
713 (when types
(x-dnd-save-state window nil nil
717 ;; Can not forget drop here, LEAVE comes before DROP_START and
718 ;; we need the state in DROP_START.
719 ((eq message-type
'XmTOP_LEVEL_LEAVE
)
722 ((eq message-type
'XmDRAG_MOTION
)
723 (let* ((state (x-dnd-get-state-for-frame frame
))
724 (timestamp (x-dnd-motif-value-to-list
725 (x-dnd-get-motif-value data
4 4
728 (x (x-dnd-motif-value-to-list
729 (x-dnd-get-motif-value data
8 2 source-byteorder
)
731 (y (x-dnd-motif-value-to-list
732 (x-dnd-get-motif-value data
10 2 source-byteorder
)
734 (dnd-source (aref state
6))
735 (first-move (not (aref state
3)))
736 (action-type (x-dnd-maybe-call-test-function
739 (reply-action (car (rassoc (car action-type
)
740 x-dnd-motif-to-action
)))
742 (x-dnd-motif-value-to-list
745 ?
\x30 ; 30: valid drop site
746 ?
\x700
) ; 700: can do copy, move or link
747 ?
\x30) ; 30: drop site, but noop.
751 (+ ?
\x80 ; 0x80 indicates a reply.
753 3 ; First time, reply is SITE_ENTER.
754 2)) ; Not first time, reply is DRAG_MOTION.
760 (x-send-client-message frame
763 "_MOTIF_DRAG_AND_DROP_MESSAGE"
767 ((eq message-type
'XmOPERATION_CHANGED
)
768 (let* ((state (x-dnd-get-state-for-frame frame
))
769 (timestamp (x-dnd-motif-value-to-list
770 (x-dnd-get-motif-value data
4 4 source-byteorder
)
772 (dnd-source (aref state
6))
773 (action-type (x-dnd-maybe-call-test-function
776 (reply-action (car (rassoc (car action-type
)
777 x-dnd-motif-to-action
)))
779 (x-dnd-motif-value-to-list
782 ?
\x30 ; 30: valid drop site
783 ?
\x700
) ; 700: can do copy, move or link
784 ?
\x30) ; 30: drop site, but noop
788 (+ ?
\x80 ; 0x80 indicates a reply.
789 8) ; 8 is OPERATION_CHANGED
793 (x-send-client-message frame
796 "_MOTIF_DRAG_AND_DROP_MESSAGE"
800 ((eq message-type
'XmDROP_START
)
801 (let* ((x (x-dnd-motif-value-to-list
802 (x-dnd-get-motif-value data
8 2 source-byteorder
)
804 (y (x-dnd-motif-value-to-list
805 (x-dnd-get-motif-value data
10 2 source-byteorder
)
807 (selection-atom (x-dnd-get-motif-value
808 data
12 4 source-byteorder
))
809 (atom-name (x-get-atom-name selection-atom
))
810 (dnd-source (x-dnd-get-motif-value
811 data
16 4 source-byteorder
))
812 (action-type (x-dnd-maybe-call-test-function
815 (reply-action (car (rassoc (car action-type
)
816 x-dnd-motif-to-action
)))
818 (x-dnd-motif-value-to-list
821 ?
\x30 ; 30: valid drop site
822 ?
\x700
) ; 700: can do copy, move or link
823 (+ ?
\x30 ; 30: drop site, but noop.
824 ?
\x200
)) ; 200: drop cancel.
828 (+ ?
\x80 ; 0x80 indicates a reply.
834 (timestamp (x-dnd-get-motif-value
835 data
4 4 source-byteorder
))
838 (x-send-client-message frame
841 "_MOTIF_DRAG_AND_DROP_MESSAGE"
845 (when (and reply-action atom-name
)
846 (let* ((value (x-get-selection-internal
848 (intern (x-dnd-current-type window
)))))
851 (x-dnd-drop-data event frame window value
852 (x-dnd-current-type window
))
854 (message "Error: %s" info
)
856 (x-get-selection-internal
858 (if action
'XmTRANSFER_SUCCESS
'XmTRANSFER_FAILURE
)
860 (x-dnd-forget-drop frame
)))
862 (t (error "Unknown Motif DND message %s %s" message data
)))))
870 ;;; arch-tag: b621fb7e-50da-4323-850b-5fc71ae64621
871 ;;; x-dnd.el ends here