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3212eb61 DP |
1 | ;;; tree-widget.el --- Tree widget |
2 | ||
3bcf793c | 3 | ;; Copyright (C) 2004, 2005 Free Software Foundation, Inc. |
3212eb61 DP |
4 | |
5 | ;; Author: David Ponce <david@dponce.com> | |
6 | ;; Maintainer: David Ponce <david@dponce.com> | |
7 | ;; Created: 16 Feb 2001 | |
8 | ;; Keywords: extensions | |
9 | ||
10 | ;; This file is part of GNU Emacs | |
11 | ||
12 | ;; This program is free software; you can redistribute it and/or | |
13 | ;; modify it under the terms of the GNU General Public License as | |
14 | ;; published by the Free Software Foundation; either version 2, or (at | |
15 | ;; your option) any later version. | |
16 | ||
17 | ;; This program is distributed in the hope that it will be useful, but | |
18 | ;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | ;; General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with this program; see the file COPYING. If not, write to | |
086add15 LK |
24 | ;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
25 | ;; Boston, MA 02110-1301, USA. | |
3212eb61 DP |
26 | |
27 | ;;; Commentary: | |
28 | ;; | |
29 | ;; This library provide a tree widget useful to display data | |
30 | ;; structures organized in a hierarchical order. | |
31 | ;; | |
32 | ;; The following properties are specific to the tree widget: | |
33 | ;; | |
f2cb69d5 DP |
34 | ;; :open |
35 | ;; Set to non-nil to expand the tree. By default the tree is | |
36 | ;; collapsed. | |
3212eb61 | 37 | ;; |
f2cb69d5 DP |
38 | ;; :node |
39 | ;; Specify the widget used to represent the value of a tree node. | |
40 | ;; By default this is an `item' widget which displays the | |
41 | ;; tree-widget :tag property value if defined, or a string | |
42 | ;; representation of the tree-widget value. | |
3212eb61 | 43 | ;; |
f2cb69d5 DP |
44 | ;; :keep |
45 | ;; Specify a list of properties to keep when the tree is collapsed | |
46 | ;; so they can be recovered when the tree is expanded. This | |
47 | ;; property can be used in child widgets too. | |
3212eb61 | 48 | ;; |
f2cb69d5 DP |
49 | ;; :expander (obsoletes :dynargs) |
50 | ;; Specify a function to be called to dynamically provide the | |
51 | ;; tree's children in response to an expand request. This function | |
52 | ;; will be passed the tree widget and must return a list of child | |
53 | ;; widgets. | |
3212eb61 | 54 | ;; |
f2cb69d5 DP |
55 | ;; *Please note:* Child widgets returned by the :expander function |
56 | ;; are stored in the :args property of the tree widget. To speed | |
57 | ;; up successive expand requests, the :expander function is not | |
58 | ;; called again when the :args value is non-nil. To refresh child | |
59 | ;; values, it is necessary to set the :args property to nil, then | |
60 | ;; redraw the tree. | |
3212eb61 | 61 | ;; |
0cfce69f DP |
62 | ;; :open-icon (default `tree-widget-open-icon') |
63 | ;; :close-icon (default `tree-widget-close-icon') | |
64 | ;; :empty-icon (default `tree-widget-empty-icon') | |
65 | ;; :leaf-icon (default `tree-widget-leaf-icon') | |
66 | ;; Those properties define the icon widgets associated to tree | |
67 | ;; nodes. Icon widgets must derive from the `tree-widget-icon' | |
68 | ;; widget. The :tag and :glyph-name property values are | |
69 | ;; respectively used when drawing the text and graphic | |
70 | ;; representation of the tree. The :tag value must be a string | |
71 | ;; that represent a node icon, like "[+]" for example. The | |
72 | ;; :glyph-name value must the name of an image found in the current | |
73 | ;; theme, like "close" for example (see also the variable | |
74 | ;; `tree-widget-theme'). | |
3212eb61 | 75 | ;; |
0cfce69f DP |
76 | ;; :guide (default `tree-widget-guide') |
77 | ;; :end-guide (default `tree-widget-end-guide') | |
78 | ;; :no-guide (default `tree-widget-no-guide') | |
79 | ;; :handle (default `tree-widget-handle') | |
80 | ;; :no-handle (default `tree-widget-no-handle') | |
81 | ;; Those properties define `item'-like widgets used to draw the | |
82 | ;; tree guide lines. The :tag property value is used when drawing | |
83 | ;; the text representation of the tree. The graphic look and feel | |
84 | ;; is given by the images named "guide", "no-guide", "end-guide", | |
85 | ;; "handle", and "no-handle" found in the current theme (see also | |
86 | ;; the variable `tree-widget-theme'). | |
3212eb61 | 87 | ;; |
0cfce69f | 88 | ;; These are the default :tag values for icons, and guide lines: |
3212eb61 | 89 | ;; |
0cfce69f DP |
90 | ;; open-icon "[-]" |
91 | ;; close-icon "[+]" | |
92 | ;; empty-icon "[X]" | |
93 | ;; leaf-icon "" | |
94 | ;; guide " |" | |
95 | ;; no-guide " " | |
96 | ;; end-guide " `" | |
97 | ;; handle "-" | |
98 | ;; no-handle " " | |
99 | ;; | |
100 | ;; The text representation of a tree looks like this: | |
101 | ;; | |
102 | ;; [-] 1 (open-icon :node) | |
103 | ;; |-[+] 1.0 (guide+handle+close-icon :node) | |
104 | ;; |-[X] 1.1 (guide+handle+empty-icon :node) | |
105 | ;; `-[-] 1.2 (end-guide+handle+open-icon :node) | |
106 | ;; |- 1.2.1 (no-guide+no-handle+guide+handle+leaf-icon leaf) | |
107 | ;; `- 1.2.2 (no-guide+no-handle+end-guide+handle+leaf-icon leaf) | |
3212eb61 | 108 | ;; |
f2cb69d5 DP |
109 | ;; By default, images will be used instead of strings to draw a |
110 | ;; nice-looking tree. See the `tree-widget-image-enable', | |
111 | ;; `tree-widget-themes-directory', and `tree-widget-theme' options for | |
112 | ;; more details. | |
3212eb61 DP |
113 | |
114 | ;;; History: | |
115 | ;; | |
116 | ||
117 | ;;; Code: | |
118 | (eval-when-compile (require 'cl)) | |
119 | (require 'wid-edit) | |
120 | \f | |
121 | ;;; Customization | |
122 | ;; | |
123 | (defgroup tree-widget nil | |
f2cb69d5 | 124 | "Customization support for the Tree Widget library." |
bf247b6e | 125 | :version "22.1" |
3212eb61 DP |
126 | :group 'widgets) |
127 | ||
128 | (defcustom tree-widget-image-enable | |
129 | (not (or (featurep 'xemacs) (< emacs-major-version 21))) | |
f2cb69d5 | 130 | "*Non-nil means that tree-widget will try to use images." |
3212eb61 DP |
131 | :type 'boolean |
132 | :group 'tree-widget) | |
133 | ||
134 | (defcustom tree-widget-themes-directory "tree-widget" | |
f2cb69d5 | 135 | "*Name of the directory where to look up for image themes. |
3212eb61 | 136 | When nil use the directory where the tree-widget library is located. |
f2cb69d5 | 137 | When a relative name is specified, try to locate that sub directory in |
3212eb61 | 138 | `load-path', then in the data directory, and use the first one found. |
f2cb69d5 DP |
139 | The data directory is the value of the variable `data-directory' on |
140 | Emacs, and what `(locate-data-directory \"tree-widget\")' returns on | |
141 | XEmacs. | |
142 | The default is to use the \"tree-widget\" relative name." | |
3212eb61 DP |
143 | :type '(choice (const :tag "Default" "tree-widget") |
144 | (const :tag "With the library" nil) | |
145 | (directory :format "%{%t%}:\n%v")) | |
146 | :group 'tree-widget) | |
147 | ||
148 | (defcustom tree-widget-theme nil | |
f2cb69d5 DP |
149 | "*Name of the theme where to look up for images. |
150 | It must be a sub directory of the directory specified in variable | |
0cfce69f DP |
151 | `tree-widget-themes-directory'. The default theme is \"default\". |
152 | When an image is not found in a theme, it is searched in the default | |
153 | theme. | |
154 | ||
155 | A complete theme must at least contain images with these file names | |
156 | with a supported extension (see also `tree-widget-image-formats'): | |
f2cb69d5 | 157 | |
f2cb69d5 DP |
158 | \"guide\" |
159 | A vertical guide line. | |
160 | \"no-guide\" | |
161 | An invisible vertical guide line. | |
162 | \"end-guide\" | |
163 | End of a vertical guide line. | |
164 | \"handle\" | |
0cfce69f | 165 | Horizontal guide line that joins the vertical guide line to an icon. |
f2cb69d5 | 166 | \"no-handle\" |
0cfce69f DP |
167 | An invisible handle. |
168 | ||
169 | Plus images whose name is given by the :glyph-name property of the | |
170 | icon widgets used to draw the tree. By default these images are used: | |
171 | ||
172 | \"open\" | |
173 | Icon associated to an expanded tree. | |
174 | \"close\" | |
175 | Icon associated to a collapsed tree. | |
176 | \"empty\" | |
177 | Icon associated to an expanded tree with no child. | |
178 | \"leaf\" | |
179 | Icon associated to a leaf node." | |
3212eb61 DP |
180 | :type '(choice (const :tag "Default" nil) |
181 | (string :tag "Name")) | |
182 | :group 'tree-widget) | |
183 | ||
184 | (defcustom tree-widget-image-properties-emacs | |
185 | '(:ascent center :mask (heuristic t)) | |
f2cb69d5 | 186 | "*Default properties of Emacs images." |
3212eb61 DP |
187 | :type 'plist |
188 | :group 'tree-widget) | |
189 | ||
190 | (defcustom tree-widget-image-properties-xemacs | |
191 | nil | |
f2cb69d5 | 192 | "*Default properties of XEmacs images." |
3212eb61 DP |
193 | :type 'plist |
194 | :group 'tree-widget) | |
0cfce69f DP |
195 | |
196 | (defcustom tree-widget-space-width 0.5 | |
197 | "Amount of space between an icon image and a node widget. | |
198 | Must be a valid space :width display property." | |
199 | :group 'tree-widget | |
200 | :type 'sexp) | |
3212eb61 DP |
201 | \f |
202 | ;;; Image support | |
203 | ;; | |
f2cb69d5 | 204 | (eval-and-compile ;; Emacs/XEmacs compatibility stuff |
3212eb61 DP |
205 | (cond |
206 | ;; XEmacs | |
207 | ((featurep 'xemacs) | |
208 | (defsubst tree-widget-use-image-p () | |
209 | "Return non-nil if image support is currently enabled." | |
210 | (and tree-widget-image-enable | |
211 | widget-glyph-enable | |
212 | (console-on-window-system-p))) | |
213 | (defsubst tree-widget-create-image (type file &optional props) | |
f2cb69d5 DP |
214 | "Create an image of type TYPE from FILE, and return it. |
215 | Give the image the specified properties PROPS." | |
3212eb61 DP |
216 | (apply 'make-glyph `([,type :file ,file ,@props]))) |
217 | (defsubst tree-widget-image-formats () | |
f2cb69d5 | 218 | "Return the alist of image formats/file name extensions. |
3212eb61 DP |
219 | See also the option `widget-image-file-name-suffixes'." |
220 | (delq nil | |
221 | (mapcar | |
222 | #'(lambda (fmt) | |
223 | (and (valid-image-instantiator-format-p (car fmt)) fmt)) | |
224 | widget-image-file-name-suffixes))) | |
225 | ) | |
f2cb69d5 | 226 | ;; Emacs |
3212eb61 DP |
227 | (t |
228 | (defsubst tree-widget-use-image-p () | |
229 | "Return non-nil if image support is currently enabled." | |
230 | (and tree-widget-image-enable | |
231 | widget-image-enable | |
232 | (display-images-p))) | |
233 | (defsubst tree-widget-create-image (type file &optional props) | |
f2cb69d5 DP |
234 | "Create an image of type TYPE from FILE, and return it. |
235 | Give the image the specified properties PROPS." | |
3212eb61 DP |
236 | (apply 'create-image `(,file ,type nil ,@props))) |
237 | (defsubst tree-widget-image-formats () | |
f2cb69d5 DP |
238 | "Return the alist of image formats/file name extensions. |
239 | See also the option `widget-image-file-name-suffixes'." | |
3212eb61 DP |
240 | (delq nil |
241 | (mapcar | |
242 | #'(lambda (fmt) | |
243 | (and (image-type-available-p (car fmt)) fmt)) | |
244 | widget-image-conversion))) | |
245 | )) | |
246 | ) | |
247 | ||
248 | ;; Buffer local cache of theme data. | |
249 | (defvar tree-widget--theme nil) | |
250 | ||
251 | (defsubst tree-widget-theme-name () | |
252 | "Return the current theme name, or nil if no theme is active." | |
253 | (and tree-widget--theme (aref tree-widget--theme 0))) | |
254 | ||
255 | (defsubst tree-widget-set-theme (&optional name) | |
256 | "In the current buffer, set the theme to use for images. | |
f2cb69d5 DP |
257 | The current buffer must be where the tree widget is drawn. |
258 | Optional argument NAME is the name of the theme to use. It defaults | |
3212eb61 | 259 | to the value of the variable `tree-widget-theme'. |
f2cb69d5 | 260 | Does nothing if NAME is already the current theme." |
3212eb61 | 261 | (or name (setq name (or tree-widget-theme "default"))) |
f2cb69d5 | 262 | (unless (string-equal name (tree-widget-theme-name)) |
3212eb61 DP |
263 | (set (make-local-variable 'tree-widget--theme) |
264 | (make-vector 4 nil)) | |
265 | (aset tree-widget--theme 0 name))) | |
266 | ||
267 | (defun tree-widget-themes-directory () | |
268 | "Locate the directory where to search for a theme. | |
269 | It is defined in variable `tree-widget-themes-directory'. | |
270 | Return the absolute name of the directory found, or nil if the | |
271 | specified directory is not accessible." | |
272 | (let ((found (aref tree-widget--theme 1))) | |
273 | (if found | |
274 | ;; The directory is available in the cache. | |
275 | (unless (eq found 'void) found) | |
276 | (cond | |
277 | ;; Use the directory where tree-widget is located. | |
278 | ((null tree-widget-themes-directory) | |
279 | (setq found (locate-library "tree-widget")) | |
280 | (when found | |
281 | (setq found (file-name-directory found)) | |
282 | (or (file-accessible-directory-p found) | |
283 | (setq found nil)))) | |
284 | ;; Check accessibility of absolute directory name. | |
285 | ((file-name-absolute-p tree-widget-themes-directory) | |
286 | (setq found (expand-file-name tree-widget-themes-directory)) | |
287 | (or (file-accessible-directory-p found) | |
288 | (setq found nil))) | |
289 | ;; Locate a sub-directory in `load-path' and data directory. | |
290 | (t | |
291 | (let ((path | |
292 | (append load-path | |
3212eb61 | 293 | (list (if (fboundp 'locate-data-directory) |
f2cb69d5 | 294 | ;; XEmacs |
3212eb61 | 295 | (locate-data-directory "tree-widget") |
f2cb69d5 | 296 | ;; Emacs |
3212eb61 DP |
297 | data-directory))))) |
298 | (while (and path (not found)) | |
299 | (when (car path) | |
300 | (setq found (expand-file-name | |
301 | tree-widget-themes-directory (car path))) | |
302 | (or (file-accessible-directory-p found) | |
303 | (setq found nil))) | |
304 | (setq path (cdr path)))))) | |
305 | ;; Store the result in the cache for later use. | |
306 | (aset tree-widget--theme 1 (or found 'void)) | |
307 | found))) | |
308 | ||
309 | (defsubst tree-widget-set-image-properties (props) | |
310 | "In current theme, set images properties to PROPS." | |
311 | (aset tree-widget--theme 2 props)) | |
312 | ||
313 | (defun tree-widget-image-properties (file) | |
f2cb69d5 DP |
314 | "Return the properties of an image in current theme. |
315 | FILE is the absolute file name of an image. | |
316 | ||
317 | If there is a \"tree-widget-theme-setup\" library in the theme | |
318 | directory, where is located FILE, load it to setup theme images | |
319 | properties. Typically it should contain something like this: | |
3212eb61 DP |
320 | |
321 | (tree-widget-set-image-properties | |
322 | (if (featurep 'xemacs) | |
323 | '(:ascent center) | |
324 | '(:ascent center :mask (heuristic t)) | |
325 | )) | |
326 | ||
0cfce69f DP |
327 | When there is no \"tree-widget-theme-setup\" library in the current |
328 | theme directory, load the one from the default theme, if available. | |
f2cb69d5 DP |
329 | Default global properties are provided for respectively Emacs and |
330 | XEmacs in the variables `tree-widget-image-properties-emacs', and | |
3212eb61 DP |
331 | `tree-widget-image-properties-xemacs'." |
332 | ;; If properties are in the cache, use them. | |
f2cb69d5 DP |
333 | (let ((plist (aref tree-widget--theme 2))) |
334 | (unless plist | |
335 | ;; Load tree-widget-theme-setup if available. | |
336 | (load (expand-file-name "tree-widget-theme-setup" | |
337 | (file-name-directory file)) t t) | |
338 | ;; If properties have been setup, use them. | |
339 | (unless (setq plist (aref tree-widget--theme 2)) | |
0cfce69f DP |
340 | ;; Try from the default theme. |
341 | (load (expand-file-name "../default/tree-widget-theme-setup" | |
342 | (file-name-directory file)) t t) | |
343 | ;; If properties have been setup, use them. | |
344 | (unless (setq plist (aref tree-widget--theme 2)) | |
345 | ;; By default, use supplied global properties. | |
346 | (setq plist (if (featurep 'xemacs) | |
347 | tree-widget-image-properties-xemacs | |
348 | tree-widget-image-properties-emacs)) | |
349 | ;; Setup the cache. | |
350 | (tree-widget-set-image-properties plist)))) | |
f2cb69d5 DP |
351 | plist)) |
352 | ||
353 | (defconst tree-widget--cursors | |
354 | ;; Pointer shapes when the mouse pointer is over tree-widget images. | |
355 | ;; This feature works since Emacs 22, and ignored on older versions, | |
356 | ;; and XEmacs. | |
357 | '( | |
f2cb69d5 DP |
358 | ("guide" . arrow) |
359 | ("no-guide" . arrow) | |
360 | ("end-guide" . arrow) | |
361 | ("handle" . arrow) | |
362 | ("no-handle" . arrow) | |
363 | )) | |
364 | ||
365 | (defun tree-widget-lookup-image (name) | |
366 | "Look up in current theme for an image with NAME. | |
367 | Search first in current theme, then in default theme (see also the | |
368 | variable `tree-widget-theme'). | |
369 | Return the first image found having a supported format, or nil if not | |
370 | found." | |
371 | (let ((default-directory (tree-widget-themes-directory))) | |
372 | (when default-directory | |
373 | (let (file (theme (tree-widget-theme-name))) | |
374 | (catch 'found | |
375 | (dolist (dir (if (string-equal theme "default") | |
376 | '("default") (list theme "default"))) | |
377 | (dolist (fmt (tree-widget-image-formats)) | |
378 | (dolist (ext (cdr fmt)) | |
379 | (setq file (expand-file-name (concat name ext) dir)) | |
380 | (and | |
381 | (file-readable-p file) | |
382 | (file-regular-p file) | |
383 | (throw | |
384 | 'found | |
385 | (tree-widget-create-image | |
386 | (car fmt) file | |
387 | ;; Add the pointer shape | |
388 | (cons :pointer | |
389 | (cons | |
0cfce69f DP |
390 | (or (cdr (assoc name tree-widget--cursors)) |
391 | 'hand) | |
f2cb69d5 DP |
392 | (tree-widget-image-properties file))))))))) |
393 | nil))))) | |
3212eb61 DP |
394 | |
395 | (defun tree-widget-find-image (name) | |
396 | "Find the image with NAME in current theme. | |
397 | NAME is an image file name sans extension. | |
f2cb69d5 | 398 | Return the image found, or nil if not found." |
3212eb61 DP |
399 | (when (tree-widget-use-image-p) |
400 | ;; Ensure there is an active theme. | |
401 | (tree-widget-set-theme (tree-widget-theme-name)) | |
f2cb69d5 DP |
402 | (let ((image (assoc name (aref tree-widget--theme 3)))) |
403 | ;; The image NAME is found in the cache. | |
404 | (if image | |
405 | (cdr image) | |
406 | ;; Search the image in current, and default themes. | |
407 | (prog1 | |
408 | (setq image (tree-widget-lookup-image name)) | |
409 | ;; Store image reference in the cache for later use. | |
410 | (push (cons name image) (aref tree-widget--theme 3)))) | |
411 | ))) | |
3212eb61 DP |
412 | \f |
413 | ;;; Widgets | |
414 | ;; | |
415 | (defvar tree-widget-button-keymap | |
f2cb69d5 DP |
416 | (let ((km (make-sparse-keymap))) |
417 | (if (boundp 'widget-button-keymap) | |
418 | ;; XEmacs | |
419 | (progn | |
420 | (set-keymap-parent km widget-button-keymap) | |
421 | (define-key km [button1] 'widget-button-click)) | |
422 | ;; Emacs | |
423 | (set-keymap-parent km widget-keymap) | |
424 | (define-key km [down-mouse-1] 'widget-button-click)) | |
425 | km) | |
426 | "Keymap used inside node buttons. | |
427 | Handle mouse button 1 click on buttons.") | |
3212eb61 | 428 | |
0cfce69f DP |
429 | (define-widget 'tree-widget-icon 'push-button |
430 | "Basic widget other tree-widget icons are derived from." | |
3212eb61 DP |
431 | :format "%[%t%]" |
432 | :button-keymap tree-widget-button-keymap ; XEmacs | |
433 | :keymap tree-widget-button-keymap ; Emacs | |
0cfce69f DP |
434 | :create 'tree-widget-icon-create |
435 | :action 'tree-widget-icon-action | |
436 | :help-echo 'tree-widget-icon-help-echo | |
3212eb61 DP |
437 | ) |
438 | ||
0cfce69f DP |
439 | (define-widget 'tree-widget-open-icon 'tree-widget-icon |
440 | "Icon for an expanded tree-widget node." | |
441 | :tag "[-]" | |
442 | :glyph-name "open" | |
3212eb61 DP |
443 | ) |
444 | ||
0cfce69f DP |
445 | (define-widget 'tree-widget-empty-icon 'tree-widget-icon |
446 | "Icon for an expanded tree-widget node with no child." | |
447 | :tag "[X]" | |
448 | :glyph-name "empty" | |
3212eb61 DP |
449 | ) |
450 | ||
0cfce69f DP |
451 | (define-widget 'tree-widget-close-icon 'tree-widget-icon |
452 | "Icon for a collapsed tree-widget node." | |
453 | :tag "[+]" | |
454 | :glyph-name "close" | |
3212eb61 DP |
455 | ) |
456 | ||
0cfce69f DP |
457 | (define-widget 'tree-widget-leaf-icon 'tree-widget-icon |
458 | "Icon for a tree-widget leaf node." | |
459 | :tag "" | |
460 | :glyph-name "leaf" | |
461 | :button-face 'default | |
3212eb61 DP |
462 | ) |
463 | ||
464 | (define-widget 'tree-widget-guide 'item | |
f2cb69d5 | 465 | "Vertical guide line." |
3212eb61 DP |
466 | :tag " |" |
467 | ;;:tag-glyph (tree-widget-find-image "guide") | |
468 | :format "%t" | |
469 | ) | |
470 | ||
471 | (define-widget 'tree-widget-end-guide 'item | |
f2cb69d5 | 472 | "End of a vertical guide line." |
3212eb61 DP |
473 | :tag " `" |
474 | ;;:tag-glyph (tree-widget-find-image "end-guide") | |
475 | :format "%t" | |
476 | ) | |
477 | ||
478 | (define-widget 'tree-widget-no-guide 'item | |
f2cb69d5 | 479 | "Invisible vertical guide line." |
3212eb61 DP |
480 | :tag " " |
481 | ;;:tag-glyph (tree-widget-find-image "no-guide") | |
482 | :format "%t" | |
483 | ) | |
484 | ||
485 | (define-widget 'tree-widget-handle 'item | |
f2cb69d5 | 486 | "Horizontal guide line that joins a vertical guide line to a node." |
0cfce69f | 487 | :tag "-" |
3212eb61 DP |
488 | ;;:tag-glyph (tree-widget-find-image "handle") |
489 | :format "%t" | |
490 | ) | |
491 | ||
492 | (define-widget 'tree-widget-no-handle 'item | |
f2cb69d5 | 493 | "Invisible handle." |
3212eb61 DP |
494 | :tag " " |
495 | ;;:tag-glyph (tree-widget-find-image "no-handle") | |
496 | :format "%t" | |
497 | ) | |
498 | ||
499 | (define-widget 'tree-widget 'default | |
500 | "Tree widget." | |
501 | :format "%v" | |
502 | :convert-widget 'widget-types-convert-widget | |
503 | :value-get 'widget-value-value-get | |
f2cb69d5 | 504 | :value-delete 'widget-children-value-delete |
3212eb61 | 505 | :value-create 'tree-widget-value-create |
0cfce69f DP |
506 | :action 'tree-widget-action |
507 | :help-echo 'tree-widget-help-echo | |
508 | :open-icon 'tree-widget-open-icon | |
509 | :close-icon 'tree-widget-close-icon | |
510 | :empty-icon 'tree-widget-empty-icon | |
511 | :leaf-icon 'tree-widget-leaf-icon | |
f2cb69d5 DP |
512 | :guide 'tree-widget-guide |
513 | :end-guide 'tree-widget-end-guide | |
514 | :no-guide 'tree-widget-no-guide | |
515 | :handle 'tree-widget-handle | |
516 | :no-handle 'tree-widget-no-handle | |
3212eb61 DP |
517 | ) |
518 | \f | |
519 | ;;; Widget support functions | |
520 | ;; | |
521 | (defun tree-widget-p (widget) | |
f2cb69d5 | 522 | "Return non-nil if WIDGET is a tree-widget." |
3212eb61 DP |
523 | (let ((type (widget-type widget))) |
524 | (while (and type (not (eq type 'tree-widget))) | |
525 | (setq type (widget-type (get type 'widget-type)))) | |
526 | (eq type 'tree-widget))) | |
527 | ||
f2cb69d5 DP |
528 | (defun tree-widget-node (widget) |
529 | "Return WIDGET's :node child widget. | |
530 | If not found, setup an `item' widget as default. | |
531 | Signal an error if the :node widget is a tree-widget. | |
532 | WIDGET is, or derives from, a tree-widget." | |
3212eb61 | 533 | (let ((node (widget-get widget :node))) |
f2cb69d5 DP |
534 | (if node |
535 | ;; Check that the :node widget is not a tree-widget. | |
536 | (and (tree-widget-p node) | |
537 | (error "Invalid tree-widget :node %S" node)) | |
538 | ;; Setup an item widget as default :node. | |
3212eb61 DP |
539 | (setq node `(item :tag ,(or (widget-get widget :tag) |
540 | (widget-princ-to-string | |
541 | (widget-value widget))))) | |
542 | (widget-put widget :node node)) | |
543 | node)) | |
544 | ||
3212eb61 | 545 | (defun tree-widget-keep (arg widget) |
f2cb69d5 | 546 | "Save in ARG the WIDGET's properties specified by :keep." |
3212eb61 DP |
547 | (dolist (prop (widget-get widget :keep)) |
548 | (widget-put arg prop (widget-get widget prop)))) | |
549 | ||
550 | (defun tree-widget-children-value-save (widget &optional args node) | |
551 | "Save WIDGET children values. | |
f2cb69d5 DP |
552 | WIDGET is, or derives from, a tree-widget. |
553 | Children properties and values are saved in ARGS if non-nil, else in | |
554 | WIDGET's :args property value. Properties and values of the | |
555 | WIDGET's :node sub-widget are saved in NODE if non-nil, else in | |
556 | WIDGET's :node sub-widget." | |
557 | (let ((args (cons (or node (widget-get widget :node)) | |
558 | (or args (widget-get widget :args)))) | |
559 | (children (widget-get widget :children)) | |
3212eb61 DP |
560 | arg child) |
561 | (while (and args children) | |
562 | (setq arg (car args) | |
563 | args (cdr args) | |
564 | child (car children) | |
565 | children (cdr children)) | |
566 | (if (tree-widget-p child) | |
567 | ;;;; The child is a tree node. | |
568 | (progn | |
569 | ;; Backtrack :args and :node properties. | |
570 | (widget-put arg :args (widget-get child :args)) | |
f2cb69d5 | 571 | (widget-put arg :node (widget-get child :node)) |
3212eb61 DP |
572 | ;; Save :open property. |
573 | (widget-put arg :open (widget-get child :open)) | |
574 | ;; The node is open. | |
575 | (when (widget-get child :open) | |
576 | ;; Save the widget value. | |
577 | (widget-put arg :value (widget-value child)) | |
578 | ;; Save properties specified in :keep. | |
579 | (tree-widget-keep arg child) | |
580 | ;; Save children. | |
581 | (tree-widget-children-value-save | |
582 | child (widget-get arg :args) (widget-get arg :node)))) | |
583 | ;;;; Another non tree node. | |
f2cb69d5 | 584 | ;; Save the widget value. |
3212eb61 DP |
585 | (widget-put arg :value (widget-value child)) |
586 | ;; Save properties specified in :keep. | |
f2cb69d5 | 587 | (tree-widget-keep arg child))))) |
0cfce69f DP |
588 | \f |
589 | ;;; Widget creation | |
590 | ;; | |
591 | (defvar tree-widget-before-create-icon-functions nil | |
592 | "Hooks run before to create a tree-widget icon. | |
593 | Each function is passed the icon widget not yet created. | |
594 | The value of the icon widget :node property is a tree :node widget or | |
595 | a leaf node widget, not yet created. | |
596 | This hook can be used to dynamically change properties of the icon and | |
597 | associated node widgets. For example, to dynamically change the look | |
598 | and feel of the tree-widget by changing the values of the :tag | |
599 | and :glyph-name properties of the icon widget. | |
600 | This hook should be local in the buffer setup to display widgets.") | |
601 | ||
602 | (defun tree-widget-icon-create (icon) | |
603 | "Create the ICON widget." | |
604 | (run-hook-with-args 'tree-widget-before-create-icon-functions icon) | |
605 | (widget-put icon :tag-glyph | |
606 | (tree-widget-find-image (widget-get icon :glyph-name))) | |
607 | ;; Ensure there is at least one char to display the image. | |
608 | (and (widget-get icon :tag-glyph) | |
609 | (equal "" (or (widget-get icon :tag) "")) | |
610 | (widget-put icon :tag " ")) | |
611 | (widget-default-create icon) | |
612 | ;; Insert space between the icon and the node widget. | |
613 | (insert-char ? 1) | |
614 | (put-text-property | |
615 | (1- (point)) (point) | |
616 | 'display (list 'space :width tree-widget-space-width))) | |
3212eb61 | 617 | |
3212eb61 | 618 | (defun tree-widget-value-create (tree) |
f2cb69d5 DP |
619 | "Create the TREE tree-widget." |
620 | (let* ((node (tree-widget-node tree)) | |
621 | (flags (widget-get tree :tree-widget--guide-flags)) | |
61194c8d | 622 | (indent (widget-get tree :indent)) |
f2cb69d5 DP |
623 | ;; Setup widget's image support. Looking up for images, and |
624 | ;; setting widgets' :tag-glyph is done here, to allow to | |
625 | ;; dynamically change the image theme. | |
626 | (widget-image-enable (tree-widget-use-image-p)) ; Emacs | |
627 | (widget-glyph-enable widget-image-enable) ; XEmacs | |
3212eb61 | 628 | children buttons) |
66c20a82 | 629 | (and indent (not (widget-get tree :parent)) |
61194c8d | 630 | (insert-char ?\ indent)) |
3212eb61 | 631 | (if (widget-get tree :open) |
f2cb69d5 | 632 | ;;;; Expanded node. |
3bcf793c | 633 | (let ((args (widget-get tree :args)) |
f2cb69d5 DP |
634 | (xpandr (or (widget-get tree :expander) |
635 | (widget-get tree :dynargs))) | |
f2cb69d5 DP |
636 | (guide (widget-get tree :guide)) |
637 | (noguide (widget-get tree :no-guide)) | |
638 | (endguide (widget-get tree :end-guide)) | |
639 | (handle (widget-get tree :handle)) | |
640 | (nohandle (widget-get tree :no-handle)) | |
3bcf793c DP |
641 | (guidi (tree-widget-find-image "guide")) |
642 | (noguidi (tree-widget-find-image "no-guide")) | |
643 | (endguidi (tree-widget-find-image "end-guide")) | |
644 | (handli (tree-widget-find-image "handle")) | |
0cfce69f | 645 | (nohandli (tree-widget-find-image "no-handle"))) |
f2cb69d5 DP |
646 | ;; Request children at run time, when not already done. |
647 | (when (and (not args) xpandr) | |
648 | (setq args (mapcar 'widget-convert (funcall xpandr tree))) | |
649 | (widget-put tree :args args)) | |
0cfce69f | 650 | ;; Create the icon widget for the expanded tree. |
3212eb61 | 651 | (push (widget-create-child-and-convert |
0cfce69f DP |
652 | tree (widget-get tree (if args :open-icon :empty-icon)) |
653 | ;; At this point the node widget isn't yet created. | |
654 | :node (setq node (widget-convert node))) | |
3212eb61 | 655 | buttons) |
0cfce69f DP |
656 | ;; Create the tree node widget. |
657 | (push (widget-create-child tree node) children) | |
658 | ;; Update the icon :node with the created node widget. | |
659 | (widget-put (car buttons) :node (car children)) | |
660 | ;; Create the tree children. | |
3212eb61 | 661 | (while args |
0cfce69f DP |
662 | (setq node (car args) |
663 | args (cdr args)) | |
3bcf793c | 664 | (and indent (insert-char ?\ indent)) |
f2cb69d5 | 665 | ;; Insert guide lines elements from previous levels. |
3bcf793c | 666 | (dolist (f (reverse flags)) |
3212eb61 DP |
667 | (widget-create-child-and-convert |
668 | tree (if f guide noguide) | |
669 | :tag-glyph (if f guidi noguidi)) | |
670 | (widget-create-child-and-convert | |
f2cb69d5 DP |
671 | tree nohandle :tag-glyph nohandli)) |
672 | ;; Insert guide line element for this level. | |
3212eb61 DP |
673 | (widget-create-child-and-convert |
674 | tree (if args guide endguide) | |
675 | :tag-glyph (if args guidi endguidi)) | |
676 | ;; Insert the node handle line | |
677 | (widget-create-child-and-convert | |
678 | tree handle :tag-glyph handli) | |
0cfce69f DP |
679 | (if (tree-widget-p node) |
680 | ;; Create a sub-tree node. | |
681 | (push (widget-create-child-and-convert | |
682 | tree node :tree-widget--guide-flags | |
683 | (cons (if args t) flags)) | |
684 | children) | |
685 | ;; Create the icon widget for a leaf node. | |
3212eb61 | 686 | (push (widget-create-child-and-convert |
0cfce69f DP |
687 | tree (widget-get tree :leaf-icon) |
688 | ;; At this point the node widget isn't yet created. | |
689 | :node (setq node (widget-convert | |
690 | node :tree-widget--guide-flags | |
691 | (cons (if args t) flags))) | |
692 | :tree-widget--leaf-flag t) | |
693 | buttons) | |
694 | ;; Create the leaf node widget. | |
695 | (push (widget-create-child tree node) children) | |
696 | ;; Update the icon :node with the created node widget. | |
697 | (widget-put (car buttons) :node (car children))))) | |
f2cb69d5 | 698 | ;;;; Collapsed node. |
0cfce69f | 699 | ;; Create the icon widget for the collapsed tree. |
3212eb61 | 700 | (push (widget-create-child-and-convert |
0cfce69f DP |
701 | tree (widget-get tree :close-icon) |
702 | ;; At this point the node widget isn't yet created. | |
703 | :node (setq node (widget-convert node))) | |
3212eb61 | 704 | buttons) |
0cfce69f DP |
705 | ;; Create the tree node widget. |
706 | (push (widget-create-child tree node) children) | |
707 | ;; Update the icon :node with the created node widget. | |
708 | (widget-put (car buttons) :node (car children))) | |
709 | ;; Save widget children and buttons. The tree-widget :node child | |
710 | ;; is the first element in :children. | |
3212eb61 | 711 | (widget-put tree :children (nreverse children)) |
0cfce69f DP |
712 | (widget-put tree :buttons buttons))) |
713 | \f | |
714 | ;;; Widget callbacks | |
715 | ;; | |
716 | (defsubst tree-widget-leaf-node-icon-p (icon) | |
717 | "Return non-nil if ICON is a leaf node icon. | |
718 | That is, if its :node property value is a leaf node widget." | |
719 | (widget-get icon :tree-widget--leaf-flag)) | |
720 | ||
721 | (defun tree-widget-icon-action (icon &optional event) | |
722 | "Handle the ICON widget :action. | |
723 | If ICON :node is a leaf node it handles the :action. The tree-widget | |
724 | parent of ICON handles the :action otherwise. | |
725 | Pass the received EVENT to :action." | |
726 | (let ((node (widget-get icon (if (tree-widget-leaf-node-icon-p icon) | |
727 | :node :parent)))) | |
728 | (widget-apply node :action event))) | |
729 | ||
730 | (defun tree-widget-icon-help-echo (icon) | |
731 | "Return the help-echo string of ICON. | |
732 | If ICON :node is a leaf node it handles the :help-echo. The tree-widget | |
733 | parent of ICON handles the :help-echo otherwise." | |
734 | (let* ((node (widget-get icon (if (tree-widget-leaf-node-icon-p icon) | |
735 | :node :parent))) | |
736 | (help-echo (widget-get node :help-echo))) | |
737 | (if (functionp help-echo) | |
738 | (funcall help-echo node) | |
739 | help-echo))) | |
740 | ||
741 | (defvar tree-widget-after-toggle-functions nil | |
742 | "Hooks run after toggling a tree-widget expansion. | |
743 | Each function is passed a tree-widget. If the value of the :open | |
744 | property is non-nil the tree has been expanded, else collapsed. | |
745 | This hook should be local in the buffer setup to display widgets.") | |
746 | ||
747 | (defun tree-widget-action (tree &optional event) | |
748 | "Handle the :action of the TREE tree-widget. | |
749 | That is, toggle expansion of the TREE tree-widget. | |
750 | Ignore the EVENT argument." | |
751 | (let ((open (not (widget-get tree :open)))) | |
752 | (or open | |
753 | ;; Before to collapse the node, save children values so next | |
754 | ;; open can recover them. | |
755 | (tree-widget-children-value-save tree)) | |
756 | (widget-put tree :open open) | |
757 | (widget-value-set tree open) | |
758 | (run-hook-with-args 'tree-widget-after-toggle-functions tree))) | |
759 | ||
760 | (defun tree-widget-help-echo (tree) | |
761 | "Return the help-echo string of the TREE tree-widget." | |
762 | (if (widget-get tree :open) | |
763 | "Collapse node" | |
764 | "Expand node")) | |
3212eb61 DP |
765 | |
766 | (provide 'tree-widget) | |
767 | ||
f2cb69d5 | 768 | ;; arch-tag: c3a1ada2-1663-41dc-9d16-2479ed8320e8 |
3212eb61 | 769 | ;;; tree-widget.el ends here |