1 ;;; dragdrop.el --- window system-independent Drag'n'Drop support.
3 ;; Copyright (C) 1998 Oliver Graf <ograf@fga.de>
5 ;; Maintainer: XEmacs Development Team, Oliver Graf <ograf@fga.de>
6 ;; Keywords: mouse, gui, dumped
8 ;; This file is part of XEmacs.
10 ;; XEmacs is free software; you can redistribute it and/or modify it
11 ;; under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; XEmacs is distributed in the hope that it will be useful, but
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ;; General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with XEmacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
25 ;;; Synched up with: Not in FSF.
29 ;; This file is dumped with XEmacs (when drag'n'drop support is compiled in).
33 ;; we need mouse-set-point
37 ;; I think this is a better name for the custom group
38 ;; looks better in the menu and the group display as dragdrop
39 ;; Anyway: is dragdrop- a good prefix for all this?
40 ;; What if someone trys drop<TAB> in the minibuffer?
41 (defgroup drag-n-drop nil
42 "*{EXPERIMENTAL} Window system-independent drag'n'drop support."
45 (defcustom dragdrop-drop-at-point nil
46 "*{EXPERIMENTAL} If non-nil, drop text at the cursor location.
47 Otherwise, the cursor will be moved to the location of the pointer drop before
52 (defcustom dragdrop-autoload-tm-view nil
53 "*{EXPERIMENTAL} If non-nil, autoload tm-view to decode MIME data.
54 Otherwise, the buffer is only decoded if tm-view is already available."
58 ;; the widget for editing the drop-functions
59 (define-widget 'dragdrop-function-widget 'list
60 "*{EXPERIMENTAL} Widget for editing drop dispatch functions."
61 :args `((choice :tag "Function"
62 (function-item experimental-dragdrop-drop-url-default)
63 (function-item experimental-dragdrop-drop-mime-default)
64 (function-item experimental-dragdrop-drop-log-function)
65 (function :tag "Other" nil))
66 (choice :tag "Button" :value t
67 (choice-item :tag "Ignore" t)
68 (choice-item 0) (choice-item 1) (choice-item 2)
69 (choice-item 3) (choice-item 4) (choice-item 5)
70 (choice-item 6) (choice-item 7))
71 (radio-button-choice :tag "Modifiers"
72 (const :tag "Ignore Modifier Keys" t)
74 :format "Modifier Keys:\n%v"
82 (repeat :inline t :value nil :tag "Extra Function Arguments"
83 (sexp :tag "Arg" :value nil)))
86 (defcustom experimental-dragdrop-drop-functions '((experimental-dragdrop-drop-url-default t t)
87 (experimental-dragdrop-drop-mime-default t t))
88 "*{EXPERIMENTAL} This is the standart drop function search list.
89 Each element is a list of a function, a button selector, a modifier
90 selector and optional argumets to the function call.
91 The function must accept at least two arguments: first is the event
92 of the drop, second the object data, followed by any of the optional
93 arguments provided in this list.
94 The functions are called in order, until one returns t."
96 :type '(repeat dragdrop-function-widget))
98 (defgroup dnd-debug nil
99 "*{EXPERIMENTAL} Drag'n'Drop debugging options."
102 (defcustom dragdrop-drop-log nil
103 "*{EXPERIMENTAL} If non-nil, every drop is logged.
104 The name of the buffer is set in the custom 'dragdrop-drop-log-name"
108 (defcustom dragdrop-drop-log-name "*drop log buffer*"
109 "*{EXPERIMENTAL} The name of the buffer used to log drops.
110 Set dragdrop-drop-log to non-nil to enable this feature."
114 (defvar dragdrop-drop-log-buffer nil
115 "*{EXPERIMENTAL} Buffer to log drops in debug mode.")
120 (defun dragdrop-drop-dispatch (object)
121 "*{EXPERIMENTAL} This function identifies DROP type misc-user-events.
122 It calls functions which will handle the drag."
123 (let ((event current-mouse-event))
124 (and dragdrop-drop-log
125 (experimental-dragdrop-drop-log-function event object))
126 (dragdrop-drop-find-functions event object)))
128 (defun dragdrop-drop-find-functions (event object)
129 "Finds valid drop-handle functions and executes them to dispose the drop.
130 It does this by looking for extent-properties called
131 'experimental-dragdrop-drop-functions and for variables named like this."
132 (catch 'dragdrop-drop-is-done
133 (and (event-over-text-area-p event)
134 ;; let's search the extents
135 (catch 'dragdrop-extents-done
136 (let ((window (event-window event))
137 (pos (event-point event))
138 (cpos (event-closest-point event))
140 (or window (throw 'dragdrop-extents-done nil))
141 (or pos (setq pos cpos))
142 (select-window window)
143 (setq buffer (window-buffer))
144 (let ((ext (extent-at pos buffer 'experimental-dragdrop-drop-functions)))
145 (while (not (eq ext nil))
146 (dragdrop-drop-do-functions
147 (extent-property ext 'experimental-dragdrop-drop-functions)
150 (setq ext (extent-at pos buffer
151 'experimental-dragdrop-drop-functions
153 ;; now look into the variable experimental-dragdrop-drop-functions
154 (dragdrop-drop-do-functions experimental-dragdrop-drop-functions event object)))
156 (defun dragdrop-compare-mods (first-mods second-mods)
157 "Returns t if both first-mods and second-mods contain the same elements.
158 Order is not important."
159 (let ((moda (copy-sequence first-mods))
160 (modb (copy-sequence second-mods)))
161 (while (and (not (eq moda ()))
163 (setq modb (delete (car moda) modb))
164 (setq moda (delete (car moda) moda)))
168 (defun dragdrop-drop-do-functions (drop-funs event object)
169 "Calls all functions in drop-funs with object until one returns t.
170 Returns t if one of drop-funs returns t. Otherwise returns nil."
172 (button (event-button event))
173 (mods (event-modifiers event)))
174 (while (not (eq drop-funs ()))
175 (setq flist (car drop-funs))
176 (and (or (eq (cadr flist) t)
177 (= (cadr flist) button))
178 (or (eq (caddr flist) t)
179 (dragdrop-compare-mods (caddr flist) mods))
180 (apply (car flist) `(,event ,object ,@(cdddr flist)))
181 ;; (funcall (car flist) event object)
182 (throw 'dragdrop-drop-is-done t))
183 (setq drop-funs (cdr drop-funs))))
186 (defun experimental-dragdrop-drop-log-function (event object &optional message buffer)
187 "*{EXPERIMENTAL} Logs any drops into a buffer.
188 If buffer is nil, it inserts the data into a buffer called after
189 dragdrop-drop-log-name.
190 If dragdrop-drop-log is non-nil, this is done automatically for each drop.
191 The function always returns nil."
193 (cond ((buffer-live-p buffer)
196 (set-buffer (get-buffer-create buffer)))
197 ((buffer-live-p dragdrop-drop-log-buffer)
198 (set-buffer dragdrop-drop-log-buffer))
200 (setq dragdrop-drop-log-buffer (get-buffer-create dragdrop-drop-log-name))
201 (set-buffer dragdrop-drop-log-buffer)))
202 (insert (format "* %s: %s\n"
203 (current-time-string)
204 (if message message "received a drop")))
205 (insert (format " at %d,%d (%d,%d) with button %d and mods %s\n"
208 (event-x-pixel event)
209 (event-y-pixel event)
211 (event-modifiers event)))
212 (insert (format " data is of type %s (%d %s)\n"
213 (cond ((eq (car object) 'dragdrop-URL) "URL")
214 ((eq (car object) 'dragdrop-MIME) "MIME")
216 (length (cdr object))
217 (if (= (length (cdr object)) 1) "element" "elements")))
220 (while (not (eq data ()))
221 (insert (format " Element %d: %S\n"
224 (setq data (cdr data))))
225 (insert "----------\n"))
228 (defun experimental-dragdrop-drop-url-default (event object)
229 "*{EXPERIMENTAL} Default handler for dropped URL data.
230 Finds files and URLs. Returns nil if object does not contain URL data."
231 (cond ((eq (car object) 'dragdrop-URL)
232 (let ((data (cdr object))
233 (frame (event-channel event))
235 (window (event-window event)))
236 (setq pop-up-windows nil)
237 (while (not (eq data ()))
238 (cond ((dragdrop-is-some-url "file" (car data))
239 ;; if it is some file, pop it to a buffer
241 (select-window window)))
242 (switch-to-buffer (find-file-noselect
243 (substring (car data) 5))))
244 ;; to-do: open ftp URLs with efs...
246 ;; some other URL, try to fire up some browser for it
247 (if (fboundp 'browse-url)
248 (browse-url (car data))
249 (display-message 'error
250 "Can't show URL, no browser selected"))))
252 (setq data (cdr data)))
253 (make-frame-visible frame)
254 (setq pop-up-windows x)
258 (defun experimental-dragdrop-drop-mime-default (event object)
259 "*{EXPERIMENTAL} Default handler for dropped MIME data.
260 Inserts text into buffer, creates MIME buffers for other types.
261 Returns nil if object does not contain MIME data."
262 (cond ((eq (car object) 'dragdrop-MIME)
263 (let ((ldata (cdr object))
264 (frame (event-channel event))
267 ;; how should this be handled???
268 ;; insert drops of text/* into buffer
269 ;; create new buffer if pointer is outside buffer...
270 ;; but there are many other ways...
272 ;; first thing: check if it's only text/plain and if the
273 ;; drop happened inside some buffer. if yes insert it into
274 ;; this buffer (hope it is not encoded in some MIME way)
276 ;; Remember: ("text/plain" "dosnotmatter" "somedata")
277 ;; drops are inserted at mouse-point, if inside a buffer
278 (while (not (eq ldata ()))
279 (setq data (car ldata))
280 (if (and (listp data)
283 (stringp (caar data))
284 (string= (caar data) "text/plain")
285 (event-over-text-area-p event))
286 (let ((window (event-window event)))
288 (select-window window))
289 (and (not dragdrop-drop-at-point)
290 (mouse-set-point event))
291 (insert (caddr data)))
292 (let ((buf (get-buffer-create "*MIME-Drop data*")))
294 (pop-to-buffer buf nil frame)
295 (or (featurep 'tm-view)
296 (and dragdrop-autoload-tm-view
298 (cond ((stringp data)
299 ;; this is some raw MIME stuff
300 ;; create some buffer and let tm do the job
302 ;; this is always the same buffer!!!
306 (and (featurep 'tm-view)
307 (mime/viewer-mode buf)))
310 ;; change the internal content-type representation to the
311 ;; way tm does it ("content/type" (key . value)*)
312 ;; but for now list will do the job
314 ;; this is always the same buffer!!!
317 (insert (caddr data))
318 (and (featurep 'tm-view)
319 ;; this list of (car data) should be done before
320 ;; enqueing the event
321 (mime/viewer-mode buf (car data) (cadr data))))
323 (display-message 'error "Wrong drop data")))))
325 (setq ldata (cdr ldata)))
326 (make-frame-visible frame)
327 (setq pop-up-windows x))
331 (defun dragdrop-is-some-url (method url)
332 "Returns true if method equals the start of url.
333 If method does not end into ':' this is appended before the
335 (cond ((and (stringp url)
337 (> (length url) (length method)))
338 ;; is this ?: check efficient enough?
339 (if (not (string= (substring method -1) ":"))
340 (setq method (concat method ":")))
341 (string= method (substring url 0 (length method))))
347 (defun experimental-dragdrop-drag (event object)
348 "*{EXPERIMENTAL} The generic drag function.
349 Tries to do the best with object in the selected protocol.
350 Object must comply to the standart drag'n'drop object
352 (error "Not implemented"))
354 (defun experimental-dragdrop-drag-region (event begin end)
355 "*{EXPERIMENTAL} Drag a region.
356 This function uses special data types if the low-level
357 protocol requires it. It does so by calling
358 dragdrop-drag-pure-text."
359 (experimental-dragdrop-drag-pure-text event
360 (buffer-substring-no-properties begin end)))
362 (defun experimental-dragdrop-drag-pure-text (event text)
363 "*{EXPERIMENTAL} Drag text-only data.
364 Takes care of special low-level protocol data types.
365 Text must be a list of strings."
366 (error "Not implemented"))
368 (defun experimental-dragdrop-drag-pure-file (event file)
369 "*{EXPERIMENTAL} Drag filepath-only data.
370 Takes care of special low-level protocol data types.
371 file must be a list of strings."
372 (error "Not implemented"))
375 ;; The following ones come from frame.el but the better belong here
378 (defun cde-start-drag (event type data)
379 "Implement the CDE drag operation.
380 Calls the internal function cde-start-drag-internal to do the actual work."
383 ;; Avoid build-time doc string warning by calling the function
384 ;; in the following roundabout way:
385 (funcall (intern "cde-start-drag-internal")
387 (error "CDE functionality not compiled in.")))
389 (defun cde-start-drag-region (event begin end)
390 "Implement the CDE drag operation for a region.
391 Calls the internal function CDE-start-drag-internal to do the actual work.
392 This always does buffer transfers."
393 ;; Oliver Graf <ograf@fga.de>
396 (funcall (intern "cde-start-drag-internal")
397 event nil (list (buffer-substring-no-properties begin end)))
398 (error "CDE functionality not compiled in.")))
400 ;; the OffiX drag stuff will soon move also (perhaps mouse.el)
401 ;; if the drag event is done
402 (defun offix-start-drag (event data &optional type)
403 "Implement the OffiX drag operation.
404 Calls the internal function offix-start-drag-internal to do the actual work.
405 If type is not given, DndText is assumed."
406 ;; Oliver Graf <ograf@fga.de>
408 (if (featurep 'offix)
409 (funcall (intern "offix-start-drag-internal") event data type)
410 (error "OffiX functionality not compiled in.")))
412 (defun offix-start-drag-region (event begin end)
413 "Implement the OffiX drag operation for a region.
414 Calls the internal function offix-start-drag-internal to do the actual work.
415 This always assumes DndText as type."
416 ;; Oliver Graf <ograf@fga.de>
418 (if (featurep 'offix)
419 (funcall (intern "offix-start-drag-internal")
420 event (buffer-substring-no-properties begin end))
421 (error "OffiX functionality not compiled in.")))
423 (defun gtk-start-drag (event data &optional type)
426 (gtk-start-drag-internal event data type)
427 (error "GTK functionality not compiled in.")))
429 (defun gtk-start-drag-region (event begin end)
432 (gtk-start-drag-internal event (buffer-substring-no-properties begin end) "text/plain")
433 (error "GTK functionality not compiled in.")))
435 ;;; dragdrop.el ends here