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4009494e | 1 | \input texinfo.tex |
4009494e | 2 | @c %**start of header |
db78a8cb | 3 | @setfilename ../../info/widget |
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4 | @settitle The Emacs Widget Library |
5 | @syncodeindex fn cp | |
6 | @syncodeindex vr cp | |
7 | @syncodeindex ky cp | |
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8 | @c %**end of header |
9 | ||
10 | @copying | |
73b0cd50 | 11 | Copyright @copyright{} 2000-2011 Free Software Foundation, Inc. |
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12 | |
13 | @quotation | |
14 | Permission is granted to copy, distribute and/or modify this document | |
6a2c4aec | 15 | under the terms of the GNU Free Documentation License, Version 1.3 or |
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16 | any later version published by the Free Software Foundation; with no |
17 | Invariant Sections, with the Front-Cover texts being ``A GNU Manual'', | |
18 | and with the Back-Cover Texts as in (a) below. A copy of the license | |
19 | is included in the section entitled ``GNU Free Documentation License''. | |
4009494e | 20 | |
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21 | (a) The FSF's Back-Cover Text is: ``You have the freedom to copy and |
22 | modify this GNU manual. Buying copies from the FSF supports it in | |
23 | developing GNU and promoting software freedom.'' | |
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24 | @end quotation |
25 | @end copying | |
26 | ||
0c973505 | 27 | @dircategory Emacs lisp libraries |
4009494e | 28 | @direntry |
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29 | * Widget: (widget). The "widget" package used by the Emacs |
30 | Customization facility. | |
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31 | @end direntry |
32 | ||
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33 | @contents |
34 | ||
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35 | @node Top, Introduction, (dir), (dir) |
36 | @comment node-name, next, previous, up | |
37 | @top The Emacs Widget Library | |
38 | ||
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39 | @insertcopying |
40 | ||
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41 | @menu |
42 | * Introduction:: | |
43 | * User Interface:: | |
44 | * Programming Example:: | |
45 | * Setting Up the Buffer:: | |
46 | * Basic Types:: | |
47 | * Sexp Types:: | |
48 | * Widget Properties:: | |
49 | * Defining New Widgets:: | |
50 | * Widget Browser:: | |
51 | * Widget Minor Mode:: | |
52 | * Utilities:: | |
53 | * Widget Wishlist:: | |
54 | * GNU Free Documentation License:: | |
55 | * Index:: | |
56 | @end menu | |
57 | ||
58 | @node Introduction, User Interface, Top, Top | |
59 | @comment node-name, next, previous, up | |
60 | @section Introduction | |
61 | ||
62 | Most graphical user interface toolkits provide a number of standard | |
63 | user interface controls (sometimes known as `widgets' or `gadgets'). | |
64 | Emacs doesn't really support anything like this, except for an | |
65 | incredibly powerful text ``widget.'' On the other hand, Emacs does | |
66 | provide the necessary primitives to implement many other widgets | |
67 | within a text buffer. The @code{widget} package simplifies this task. | |
68 | ||
69 | @cindex basic widgets | |
70 | @cindex widgets, basic types | |
71 | The basic widgets are: | |
72 | ||
73 | @table @code | |
74 | @item link | |
75 | Areas of text with an associated action. Intended for hypertext links | |
76 | embedded in text. | |
77 | @item push-button | |
78 | Like link, but intended for stand-alone buttons. | |
79 | @item editable-field | |
80 | An editable text field. It can be either variable or fixed length. | |
81 | @item menu-choice | |
82 | Allows the user to choose one of multiple options from a menu, each | |
83 | option is itself a widget. Only the selected option will be visible in | |
84 | the buffer. | |
85 | @item radio-button-choice | |
86 | Allows the user to choose one of multiple options by activating radio | |
87 | buttons. The options are implemented as widgets. All options will be | |
88 | visible in the buffer. | |
89 | @item item | |
90 | A simple constant widget intended to be used in the @code{menu-choice} and | |
91 | @code{radio-button-choice} widgets. | |
92 | @item choice-item | |
93 | A button item only intended for use in choices. When invoked, the user | |
94 | will be asked to select another option from the choice widget. | |
95 | @item toggle | |
96 | A simple @samp{on}/@samp{off} switch. | |
97 | @item checkbox | |
98 | A checkbox (@samp{[ ]}/@samp{[X]}). | |
99 | @item editable-list | |
100 | Create an editable list. The user can insert or delete items in the | |
101 | list. Each list item is itself a widget. | |
102 | @end table | |
103 | ||
104 | Now, of what possible use can support for widgets be in a text editor? | |
105 | I'm glad you asked. The answer is that widgets are useful for | |
106 | implementing forms. A @dfn{form} in Emacs is a buffer where the user is | |
107 | supposed to fill out a number of fields, each of which has a specific | |
108 | meaning. The user is not supposed to change or delete any of the text | |
109 | between the fields. Examples of forms in Emacs are the @file{forms} | |
110 | package (of course), the customize buffers, the mail and news compose | |
111 | modes, and the @acronym{HTML} form support in the @file{w3} browser. | |
112 | ||
113 | @cindex widget library, why use it | |
114 | The advantages for a programmer of using the @code{widget} package to | |
115 | implement forms are: | |
116 | ||
117 | @enumerate | |
118 | @item | |
119 | More complex fields than just editable text are supported. | |
120 | @item | |
121 | You can give the users immediate feedback if they enter invalid data in a | |
122 | text field, and sometimes prevent entering invalid data. | |
123 | @item | |
124 | You can have fixed sized fields, thus allowing multiple fields to be | |
125 | lined up in columns. | |
126 | @item | |
127 | It is simple to query or set the value of a field. | |
128 | @item | |
129 | Editing happens in the buffer, not in the mini-buffer. | |
130 | @item | |
131 | Packages using the library get a uniform look, making them easier for | |
132 | the user to learn. | |
133 | @item | |
134 | As support for embedded graphics improve, the widget library will be | |
135 | extended to use the GUI features. This means that your code using the | |
136 | widget library will also use the new graphic features automatically. | |
137 | @end enumerate | |
138 | ||
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139 | @node User Interface, Programming Example, Introduction, Top |
140 | @comment node-name, next, previous, up | |
141 | @section User Interface | |
142 | ||
143 | A form consists of read only text for documentation and some fields, | |
144 | where each field contains two parts, a tag and a value. The tags are | |
145 | used to identify the fields, so the documentation can refer to the | |
146 | @samp{foo field}, meaning the field tagged with @samp{Foo}. Here is an | |
147 | example form: | |
148 | ||
149 | @example | |
150 | Here is some documentation. | |
151 | ||
152 | Name: @i{My Name} @strong{Choose}: This option | |
153 | Address: @i{Some Place | |
154 | In some City | |
155 | Some country.} | |
156 | ||
157 | See also @b{_other work_} for more information. | |
158 | ||
159 | Numbers: count to three below | |
160 | @b{[INS]} @b{[DEL]} @i{One} | |
161 | @b{[INS]} @b{[DEL]} @i{Eh, two?} | |
162 | @b{[INS]} @b{[DEL]} @i{Five!} | |
163 | @b{[INS]} | |
164 | ||
165 | Select multiple: | |
166 | ||
167 | @b{[X]} This | |
168 | @b{[ ]} That | |
169 | @b{[X]} Thus | |
170 | ||
171 | Select one: | |
172 | ||
173 | @b{(*)} One | |
174 | @b{( )} Another One. | |
175 | @b{( )} A Final One. | |
176 | ||
177 | @b{[Apply Form]} @b{[Reset Form]} | |
178 | @end example | |
179 | ||
180 | The top level widgets in this example are tagged @samp{Name}, | |
181 | @samp{Choose}, @samp{Address}, @samp{_other work_}, @samp{Numbers}, | |
182 | @samp{Select multiple}, @samp{Select one}, @samp{[Apply Form]}, and | |
183 | @samp{[Reset Form]}. There are basically two things the user can do | |
184 | within a form, namely editing the editable text fields and activating | |
185 | the buttons. | |
186 | ||
187 | @subsection Editable Text Fields | |
188 | ||
189 | In the example, the value for the @samp{Name} is most likely displayed | |
190 | in an editable text field, and so are values for each of the members of | |
191 | the @samp{Numbers} list. All the normal Emacs editing operations are | |
192 | available for editing these fields. The only restriction is that each | |
193 | change you make must be contained within a single editable text field. | |
194 | For example, capitalizing all text from the middle of one field to the | |
195 | middle of another field is prohibited. | |
196 | ||
197 | Editable text fields are created by the @code{editable-field} widget. | |
198 | ||
199 | @strong{Warning:} In an @code{editable-field} widget, the editable | |
200 | field must not be adjacent to another widget---that won't work. | |
201 | You must put some text in between. Either make this text part of | |
202 | the @code{editable-field} widget itself, or insert it with | |
203 | @code{widget-insert}. | |
204 | ||
205 | The @code{:format} keyword is useful for generating the necessary | |
206 | text; for instance, if you give it a value of @code{"Name: %v "}, | |
207 | the @samp{Name: } part will provide the necessary separating text | |
208 | before the field and the trailing space will provide the | |
209 | separating text after the field. If you don't include the | |
210 | @code{:size} keyword, the field will extend to the end of the | |
211 | line, and the terminating newline will provide separation after. | |
212 | ||
213 | @strong{Warning:} In an @code{editable-field} widget, the @samp{%v} escape | |
214 | must be preceded by some other text in the @code{:format} string | |
215 | (if specified). | |
216 | ||
217 | The editing text fields are highlighted with the | |
218 | @code{widget-field-face} face, making them easy to find. | |
219 | ||
220 | @deffn Face widget-field-face | |
221 | Face used for other editing fields. | |
222 | @end deffn | |
223 | ||
224 | @subsection Buttons | |
225 | ||
226 | @cindex widget buttons | |
227 | @cindex button widgets | |
228 | Some portions of the buffer have an associated @dfn{action}, which can | |
229 | be @dfn{invoked} by a standard key or mouse command. These portions | |
230 | are called @dfn{buttons}. The default commands for activating a button | |
231 | are: | |
232 | ||
233 | @table @kbd | |
234 | @item @key{RET} | |
235 | @deffn Command widget-button-press @var{pos} &optional @var{event} | |
236 | Invoke the button at @var{pos}, defaulting to point. | |
237 | If point is not located on a button, invoke the binding in | |
238 | @code{widget-global-map} (by default the global map). | |
239 | @end deffn | |
240 | ||
241 | @kindex Mouse-2 @r{(on button widgets}) | |
242 | @item Mouse-2 | |
243 | @deffn Command widget-button-click @var{event} | |
244 | Invoke the button at the location of the mouse pointer. If the mouse | |
245 | pointer is located in an editable text field, invoke the binding in | |
246 | @code{widget-global-map} (by default the global map). | |
247 | @end deffn | |
248 | @end table | |
249 | ||
250 | There are several different kind of buttons, all of which are present in | |
251 | the example: | |
252 | ||
253 | @table @emph | |
254 | @cindex option field tag | |
255 | @item The Option Field Tags | |
256 | When you invoke one of these buttons, you will be asked to choose | |
257 | between a number of different options. This is how you edit an option | |
258 | field. Option fields are created by the @code{menu-choice} widget. In | |
259 | the example, @samp{@b{Choose}} is an option field tag. | |
260 | @item The @samp{@b{[INS]}} and @samp{@b{[DEL]}} buttons | |
261 | Activating these will insert or delete elements from an editable list. | |
262 | The list is created by the @code{editable-list} widget. | |
263 | @cindex embedded buttons | |
264 | @item Embedded Buttons | |
265 | The @samp{@b{_other work_}} is an example of an embedded | |
266 | button. Embedded buttons are not associated with any fields, but can serve | |
267 | any purpose, such as implementing hypertext references. They are | |
268 | usually created by the @code{link} widget. | |
269 | @item The @samp{@b{[ ]}} and @samp{@b{[X]}} buttons | |
270 | Activating one of these will convert it to the other. This is useful | |
271 | for implementing multiple-choice fields. You can create them with the | |
272 | @code{checkbox} widget. | |
273 | @item The @samp{@b{( )}} and @samp{@b{(*)}} buttons | |
274 | Only one radio button in a @code{radio-button-choice} widget can be | |
275 | selected at any time. When you invoke one of the unselected radio | |
276 | buttons, it will be selected and the previous selected radio button will | |
277 | become unselected. | |
278 | @item The @samp{@b{[Apply Form]}} and @samp{@b{[Reset Form]}} buttons | |
279 | These are explicit buttons made with the @code{push-button} widget. The | |
280 | main difference from the @code{link} widget is that the buttons will be | |
281 | displayed as GUI buttons when possible. | |
282 | @end table | |
283 | ||
284 | To make them easier to locate, buttons are emphasized in the buffer. | |
285 | ||
286 | @deffn Face widget-button-face | |
287 | Face used for buttons. | |
288 | @end deffn | |
289 | ||
290 | @defopt widget-mouse-face | |
291 | Face used for highlighting a button when the mouse pointer moves across | |
292 | it. | |
293 | @end defopt | |
294 | ||
295 | @subsection Navigation | |
296 | ||
297 | You can use all the normal Emacs commands to move around in a form | |
298 | buffer, plus you will have these additional commands: | |
299 | ||
300 | @table @kbd | |
301 | @item @key{TAB} | |
302 | @deffn Command widget-forward &optional count | |
303 | Move point @var{count} buttons or editing fields forward. | |
304 | @end deffn | |
305 | @item @kbd{M-@key{TAB}} | |
306 | @itemx @kbd{S-@key{TAB}} | |
307 | @deffn Command widget-backward &optional count | |
308 | Move point @var{count} buttons or editing fields backward. | |
309 | @end deffn | |
310 | @end table | |
311 | ||
312 | @node Programming Example, Setting Up the Buffer, User Interface, Top | |
313 | @comment node-name, next, previous, up | |
314 | @section Programming Example | |
315 | ||
316 | @cindex widgets, programming example | |
317 | @cindex example of using widgets | |
318 | Here is the code to implement the user interface example (@pxref{User | |
319 | Interface}). | |
320 | ||
321 | @lisp | |
322 | (require 'widget) | |
323 | ||
324 | (eval-when-compile | |
325 | (require 'wid-edit)) | |
326 | ||
327 | (defvar widget-example-repeat) | |
328 | ||
329 | (defun widget-example () | |
330 | "Create the widgets from the Widget manual." | |
331 | (interactive) | |
332 | (switch-to-buffer "*Widget Example*") | |
333 | (kill-all-local-variables) | |
334 | (make-local-variable 'widget-example-repeat) | |
335 | (let ((inhibit-read-only t)) | |
336 | (erase-buffer)) | |
337 | (remove-overlays) | |
338 | (widget-insert "Here is some documentation.\n\n") | |
339 | (widget-create 'editable-field | |
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340 | :size 13 |
341 | :format "Name: %v " ; Text after the field! | |
342 | "My Name") | |
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344 | :tag "Choose" |
345 | :value "This" | |
346 | :help-echo "Choose me, please!" | |
347 | :notify (lambda (widget &rest ignore) | |
348 | (message "%s is a good choice!" | |
349 | (widget-value widget))) | |
350 | '(item :tag "This option" :value "This") | |
351 | '(choice-item "That option") | |
352 | '(editable-field :menu-tag "No option" "Thus option")) | |
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354 | :format "Address: %v" |
355 | "Some Place\nIn some City\nSome country.") | |
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356 | (widget-insert "\nSee also ") |
357 | (widget-create 'link | |
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358 | :notify (lambda (&rest ignore) |
359 | (widget-value-set widget-example-repeat | |
360 | '("En" "To" "Tre")) | |
361 | (widget-setup)) | |
362 | "other work") | |
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363 | (widget-insert |
364 | " for more information.\n\nNumbers: count to three below\n") | |
365 | (setq widget-example-repeat | |
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366 | (widget-create 'editable-list |
367 | :entry-format "%i %d %v" | |
368 | :notify (lambda (widget &rest ignore) | |
369 | (let ((old (widget-get widget | |
370 | ':example-length)) | |
371 | (new (length (widget-value widget)))) | |
372 | (unless (eq old new) | |
373 | (widget-put widget ':example-length new) | |
374 | (message "You can count to %d." new)))) | |
375 | :value '("One" "Eh, two?" "Five!") | |
376 | '(editable-field :value "three"))) | |
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377 | (widget-insert "\n\nSelect multiple:\n\n") |
378 | (widget-create 'checkbox t) | |
379 | (widget-insert " This\n") | |
380 | (widget-create 'checkbox nil) | |
381 | (widget-insert " That\n") | |
382 | (widget-create 'checkbox | |
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383 | :notify (lambda (&rest ignore) (message "Tickle")) |
384 | t) | |
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385 | (widget-insert " Thus\n\nSelect one:\n\n") |
386 | (widget-create 'radio-button-choice | |
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387 | :value "One" |
388 | :notify (lambda (widget &rest ignore) | |
389 | (message "You selected %s" | |
390 | (widget-value widget))) | |
391 | '(item "One") '(item "Another One.") '(item "A Final One.")) | |
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392 | (widget-insert "\n") |
393 | (widget-create 'push-button | |
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394 | :notify (lambda (&rest ignore) |
395 | (if (= (length (widget-value widget-example-repeat)) | |
396 | 3) | |
397 | (message "Congratulation!") | |
398 | (error "Three was the count!"))) | |
399 | "Apply Form") | |
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400 | (widget-insert " ") |
401 | (widget-create 'push-button | |
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402 | :notify (lambda (&rest ignore) |
403 | (widget-example)) | |
404 | "Reset Form") | |
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405 | (widget-insert "\n") |
406 | (use-local-map widget-keymap) | |
407 | (widget-setup)) | |
408 | @end lisp | |
409 | ||
410 | @node Setting Up the Buffer, Basic Types, Programming Example, Top | |
411 | @comment node-name, next, previous, up | |
412 | @section Setting Up the Buffer | |
413 | ||
414 | Widgets are created with @code{widget-create}, which returns a | |
415 | @dfn{widget} object. This object can be queried and manipulated by | |
416 | other widget functions, until it is deleted with @code{widget-delete}. | |
417 | After the widgets have been created, @code{widget-setup} must be called | |
418 | to enable them. | |
419 | ||
420 | @defun widget-create type [ keyword argument ]@dots{} | |
421 | Create and return a widget of type @var{type}. | |
422 | The syntax for the @var{type} argument is described in @ref{Basic Types}. | |
423 | ||
424 | The keyword arguments can be used to overwrite the keyword arguments | |
425 | that are part of @var{type}. | |
426 | @end defun | |
427 | ||
428 | @defun widget-delete widget | |
429 | Delete @var{widget} and remove it from the buffer. | |
430 | @end defun | |
431 | ||
432 | @defun widget-setup | |
433 | Set up a buffer to support widgets. | |
434 | ||
435 | This should be called after creating all the widgets and before allowing | |
436 | the user to edit them. | |
437 | @refill | |
438 | @end defun | |
439 | ||
440 | If you want to insert text outside the widgets in the form, the | |
441 | recommended way to do that is with @code{widget-insert}. | |
442 | ||
443 | @defun widget-insert | |
444 | Insert the arguments, either strings or characters, at point. | |
445 | The inserted text will be read-only. | |
446 | @end defun | |
447 | ||
448 | There is a standard widget keymap which you might find useful. | |
449 | ||
450 | @findex widget-button-press | |
451 | @findex widget-button-click | |
452 | @defvr Const widget-keymap | |
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453 | @key{TAB} and @kbd{C-@key{TAB}} are bound to @code{widget-forward} and |
454 | @code{widget-backward}, respectively. @key{RET} and @kbd{Mouse-2} | |
455 | are bound to @code{widget-button-press} and | |
456 | @code{widget-button-click}.@refill | |
457 | @end defvr | |
458 | ||
459 | @defvar widget-global-map | |
460 | Keymap used by @code{widget-button-press} and @code{widget-button-click} | |
461 | when not on a button. By default this is @code{global-map}. | |
462 | @end defvar | |
463 | ||
464 | @node Basic Types, Sexp Types, Setting Up the Buffer, Top | |
465 | @comment node-name, next, previous, up | |
466 | @section Basic Types | |
467 | ||
468 | This is the general syntax of a type specification: | |
469 | ||
470 | @example | |
471 | @var{name} ::= (@var{name} [@var{keyword} @var{argument}]... @var{args}) | |
472 | | @var{name} | |
473 | @end example | |
474 | ||
475 | Where, @var{name} is a widget name, @var{keyword} is the name of a | |
476 | property, @var{argument} is the value of the property, and @var{args} | |
477 | are interpreted in a widget specific way. | |
478 | ||
479 | @cindex keyword arguments | |
480 | The following keyword arguments apply to all widgets: | |
481 | ||
482 | @table @code | |
483 | @vindex value@r{ keyword} | |
484 | @item :value | |
485 | The initial value for widgets of this type. | |
486 | ||
487 | @vindex format@r{ keyword} | |
488 | @item :format | |
489 | This string will be inserted in the buffer when you create a widget. | |
490 | The following @samp{%} escapes are available: | |
491 | ||
492 | @table @samp | |
493 | @item %[ | |
494 | @itemx %] | |
495 | The text inside will be marked as a button. | |
496 | ||
497 | By default, the text will be shown in @code{widget-button-face}, and | |
498 | surrounded by brackets. | |
499 | ||
500 | @defopt widget-button-prefix | |
501 | String to prefix buttons. | |
502 | @end defopt | |
503 | ||
504 | @defopt widget-button-suffix | |
505 | String to suffix buttons. | |
506 | @end defopt | |
507 | ||
508 | @item %@{ | |
509 | @itemx %@} | |
510 | The text inside will be displayed with the face specified by | |
511 | @code{:sample-face}. | |
512 | ||
513 | @item %v | |
514 | This will be replaced with the buffer representation of the widget's | |
515 | value. What this is depends on the widget type. | |
516 | ||
517 | @strong{Warning:} In an @code{editable-field} widget, the @samp{%v} escape | |
518 | must be preceded by some other text in the format string (if specified). | |
519 | ||
520 | @item %d | |
521 | Insert the string specified by @code{:doc} here. | |
522 | ||
523 | @item %h | |
524 | Like @samp{%d}, with the following modifications: If the documentation | |
525 | string is more than one line, it will add a button which will toggle | |
526 | between showing only the first line, and showing the full text. | |
527 | Furthermore, if there is no @code{:doc} property in the widget, it will | |
528 | instead examine the @code{:documentation-property} property. If it is a | |
529 | lambda expression, it will be called with the widget's value as an | |
530 | argument, and the result will be used as the documentation text. | |
531 | ||
532 | @item %t | |
533 | Insert the string specified by @code{:tag} here, or the @code{princ} | |
534 | representation of the value if there is no tag. | |
535 | ||
536 | @item %% | |
537 | Insert a literal @samp{%}. | |
538 | @end table | |
539 | ||
540 | @vindex button-face@r{ keyword} | |
541 | @item :button-face | |
542 | Face used to highlight text inside %[ %] in the format. | |
543 | ||
544 | @vindex button-prefix@r{ keyword} | |
545 | @vindex button-suffix@r{ keyword} | |
546 | @item :button-prefix | |
547 | @itemx :button-suffix | |
548 | Text around %[ %] in the format. | |
549 | ||
550 | These can be | |
551 | @table @emph | |
552 | @item nil | |
553 | No text is inserted. | |
554 | ||
555 | @item a string | |
556 | The string is inserted literally. | |
557 | ||
558 | @item a symbol | |
559 | The value of the symbol is expanded according to this table. | |
560 | @end table | |
561 | ||
562 | @vindex doc@r{ keyword} | |
563 | @item :doc | |
564 | The string inserted by the @samp{%d} escape in the format | |
565 | string. | |
566 | ||
567 | @vindex tag@r{ keyword} | |
568 | @item :tag | |
569 | The string inserted by the @samp{%t} escape in the format | |
570 | string. | |
571 | ||
572 | @vindex tag-glyph@r{ keyword} | |
573 | @item :tag-glyph | |
574 | Name of image to use instead of the string specified by @code{:tag} on | |
575 | Emacsen that supports it. | |
576 | ||
577 | @vindex help-echo@r{ keyword} | |
578 | @item :help-echo | |
579 | Specifies how to display a message whenever you move to the widget with | |
580 | either @code{widget-forward} or @code{widget-backward} or move the mouse | |
581 | over it (using the standard @code{help-echo} mechanism). The argument | |
582 | is either a string to display, a function of one argument, the widget, | |
583 | which should return a string to display, or a form that evaluates to | |
584 | such a string. | |
585 | ||
586 | @vindex follow-link@r{ keyword} | |
587 | @item :follow-link | |
588 | Specifies how to interpret a @key{mouse-1} click on the widget. | |
1064a2d4 | 589 | @xref{Clickable Text,, Defining Clickable Text, elisp, the Emacs Lisp Reference Manual}. |
4009494e GM |
590 | |
591 | @vindex indent@r{ keyword} | |
592 | @item :indent | |
593 | An integer indicating the absolute number of spaces to indent children | |
594 | of this widget. | |
595 | ||
596 | @vindex offset@r{ keyword} | |
597 | @item :offset | |
598 | An integer indicating how many extra spaces to add to the widget's | |
599 | grandchildren compared to this widget. | |
600 | ||
601 | @vindex extra-offset@r{ keyword} | |
602 | @item :extra-offset | |
603 | An integer indicating how many extra spaces to add to the widget's | |
604 | children compared to this widget. | |
605 | ||
606 | @vindex notify@r{ keyword} | |
607 | @item :notify | |
608 | A function called each time the widget or a nested widget is changed. | |
609 | The function is called with two or three arguments. The first argument | |
610 | is the widget itself, the second argument is the widget that was | |
611 | changed, and the third argument is the event leading to the change, if | |
612 | any. | |
613 | ||
614 | @vindex menu-tag@r{ keyword} | |
615 | @item :menu-tag | |
616 | Tag used in the menu when the widget is used as an option in a | |
617 | @code{menu-choice} widget. | |
618 | ||
619 | @vindex menu-tag-get@r{ keyword} | |
620 | @item :menu-tag-get | |
621 | Function used for finding the tag when the widget is used as an option | |
622 | in a @code{menu-choice} widget. By default, the tag used will be either the | |
623 | @code{:menu-tag} or @code{:tag} property if present, or the @code{princ} | |
624 | representation of the @code{:value} property if not. | |
625 | ||
626 | @vindex match@r{ keyword} | |
627 | @item :match | |
628 | Should be a function called with two arguments, the widget and a value, | |
629 | and returning non-@code{nil} if the widget can represent the specified value. | |
630 | ||
631 | @vindex validate@r{ keyword} | |
632 | @item :validate | |
633 | A function which takes a widget as an argument, and returns @code{nil} | |
634 | if the widget's current value is valid for the widget. Otherwise it | |
635 | should return the widget containing the invalid data, and set that | |
636 | widget's @code{:error} property to a string explaining the error. | |
637 | ||
638 | The following predefined function can be used: | |
639 | ||
640 | @defun widget-children-validate widget | |
641 | All the @code{:children} of @var{widget} must be valid. | |
642 | @end defun | |
643 | ||
644 | @vindex tab-order@r{ keyword} | |
645 | @item :tab-order | |
646 | Specify the order in which widgets are traversed with | |
647 | @code{widget-forward} or @code{widget-backward}. This is only partially | |
648 | implemented. | |
649 | ||
650 | @enumerate a | |
651 | @item | |
652 | Widgets with tabbing order @code{-1} are ignored. | |
653 | ||
654 | @item | |
655 | (Unimplemented) When on a widget with tabbing order @var{n}, go to the | |
656 | next widget in the buffer with tabbing order @var{n+1} or @code{nil}, | |
657 | whichever comes first. | |
658 | ||
659 | @item | |
660 | When on a widget with no tabbing order specified, go to the next widget | |
661 | in the buffer with a positive tabbing order, or @code{nil} | |
662 | @end enumerate | |
663 | ||
664 | @vindex parent@r{ keyword} | |
665 | @item :parent | |
666 | The parent of a nested widget (e.g.@: a @code{menu-choice} item or an | |
667 | element of a @code{editable-list} widget). | |
668 | ||
669 | @vindex sibling-args@r{ keyword} | |
670 | @item :sibling-args | |
671 | This keyword is only used for members of a @code{radio-button-choice} or | |
672 | @code{checklist}. The value should be a list of extra keyword | |
673 | arguments, which will be used when creating the @code{radio-button} or | |
674 | @code{checkbox} associated with this item. | |
675 | ||
676 | @end table | |
677 | ||
678 | @deffn {User Option} widget-glyph-directory | |
679 | Directory where glyphs are found. | |
680 | Widget will look here for a file with the same name as specified for the | |
681 | image, with either a @file{.xpm} (if supported) or @file{.xbm} extension. | |
682 | @end deffn | |
683 | ||
684 | @deffn{User Option} widget-glyph-enable | |
685 | If non-@code{nil}, allow glyphs to appear on displays where they are supported. | |
686 | @end deffn | |
687 | ||
688 | ||
689 | @menu | |
690 | * link:: | |
691 | * url-link:: | |
692 | * info-link:: | |
693 | * push-button:: | |
694 | * editable-field:: | |
695 | * text:: | |
696 | * menu-choice:: | |
697 | * radio-button-choice:: | |
698 | * item:: | |
699 | * choice-item:: | |
700 | * toggle:: | |
701 | * checkbox:: | |
702 | * checklist:: | |
703 | * editable-list:: | |
704 | * group:: | |
705 | @end menu | |
706 | ||
707 | @node link, url-link, Basic Types, Basic Types | |
708 | @comment node-name, next, previous, up | |
709 | @subsection The @code{link} Widget | |
710 | @findex link@r{ widget} | |
711 | ||
712 | Syntax: | |
713 | ||
714 | @example | |
715 | @var{type} ::= (link [@var{keyword} @var{argument}]... [ @var{value} ]) | |
716 | @end example | |
717 | ||
718 | The @var{value}, if present, is used to initialize the @code{:value} | |
719 | property. The value should be a string, which will be inserted in the | |
720 | buffer. | |
721 | ||
722 | By default the link will be shown in brackets. | |
723 | ||
724 | @defopt widget-link-prefix | |
725 | String to prefix links. | |
726 | @end defopt | |
727 | ||
728 | @defopt widget-link-suffix | |
729 | String to suffix links. | |
730 | @end defopt | |
731 | ||
732 | @node url-link, info-link, link, Basic Types | |
733 | @comment node-name, next, previous, up | |
734 | @subsection The @code{url-link} Widget | |
735 | @findex url-link@r{ widget} | |
736 | ||
737 | Syntax: | |
738 | ||
739 | @example | |
740 | @var{type} ::= (url-link [@var{keyword} @var{argument}]... @var{url}) | |
741 | @end example | |
742 | ||
743 | @findex browse-url-browser-function@r{, and @code{url-link} widget} | |
744 | When this link is invoked, the @acronym{WWW} browser specified by | |
745 | @code{browse-url-browser-function} will be called with @var{url}. | |
746 | ||
747 | @node info-link, push-button, url-link, Basic Types | |
748 | @comment node-name, next, previous, up | |
749 | @subsection The @code{info-link} Widget | |
750 | @findex info-link@r{ widget} | |
751 | ||
752 | Syntax: | |
753 | ||
754 | @example | |
755 | @var{type} ::= (info-link [@var{keyword} @var{argument}]... @var{address}) | |
756 | @end example | |
757 | ||
758 | When this link is invoked, the built-in Info reader is started on | |
759 | @var{address}. | |
760 | ||
761 | @node push-button, editable-field, info-link, Basic Types | |
762 | @comment node-name, next, previous, up | |
763 | @subsection The @code{push-button} Widget | |
764 | @findex push-button@r{ widget} | |
765 | ||
766 | Syntax: | |
767 | ||
768 | @example | |
769 | @var{type} ::= (push-button [@var{keyword} @var{argument}]... [ @var{value} ]) | |
770 | @end example | |
771 | ||
772 | The @var{value}, if present, is used to initialize the @code{:value} | |
773 | property. The value should be a string, which will be inserted in the | |
774 | buffer. | |
775 | ||
776 | By default the tag will be shown in brackets. | |
777 | ||
778 | @defopt widget-push-button-prefix | |
779 | String to prefix push buttons. | |
780 | @end defopt | |
781 | ||
782 | @defopt widget-push-button-suffix | |
783 | String to suffix push buttons. | |
784 | @end defopt | |
785 | ||
786 | @node editable-field, text, push-button, Basic Types | |
787 | @comment node-name, next, previous, up | |
788 | @subsection The @code{editable-field} Widget | |
789 | @findex editable-field@r{ widget} | |
790 | ||
791 | Syntax: | |
792 | ||
793 | @example | |
794 | @var{type} ::= (editable-field [@var{keyword} @var{argument}]... [ @var{value} ]) | |
795 | @end example | |
796 | ||
797 | The @var{value}, if present, is used to initialize the @code{:value} | |
798 | property. The value should be a string, which will be inserted in the | |
799 | field. This widget will match all string values. | |
800 | ||
801 | The following extra properties are recognized: | |
802 | ||
803 | @table @code | |
804 | @vindex size@r{ keyword} | |
805 | @item :size | |
806 | The width of the editable field.@* | |
807 | By default the field will reach to the end of the line. | |
808 | ||
809 | @vindex value-face@r{ keyword} | |
810 | @item :value-face | |
811 | Face used for highlighting the editable field. Default is | |
812 | @code{widget-field-face}, see @ref{User Interface}. | |
813 | ||
814 | @vindex secret@r{ keyword} | |
815 | @item :secret | |
816 | Character used to display the value. You can set this to e.g.@: @code{?*} | |
817 | if the field contains a password or other secret information. By | |
818 | default, this is @code{nil}, and the value is not secret. | |
819 | ||
820 | @vindex valid-regexp@r{ keyword} | |
821 | @item :valid-regexp | |
822 | By default the @code{:validate} function will match the content of the | |
823 | field with the value of this attribute. The default value is @code{""} | |
824 | which matches everything. | |
825 | ||
826 | @vindex keymap@r{ keyword} | |
827 | @vindex widget-field-keymap | |
828 | @item :keymap | |
829 | Keymap used in the editable field. The default value is | |
830 | @code{widget-field-keymap}, which allows you to use all the normal | |
831 | editing commands, even if the buffer's major mode suppresses some of | |
832 | them. Pressing @key{RET} invokes the function specified by | |
833 | @code{:action}. | |
834 | @end table | |
835 | ||
836 | @node text, menu-choice, editable-field, Basic Types | |
837 | @comment node-name, next, previous, up | |
838 | @subsection The @code{text} Widget | |
839 | @findex text@r{ widget} | |
840 | ||
841 | @vindex widget-text-keymap | |
842 | This is just like @code{editable-field}, but intended for multiline text | |
843 | fields. The default @code{:keymap} is @code{widget-text-keymap}, which | |
844 | does not rebind the @key{RET} key. | |
845 | ||
846 | @node menu-choice, radio-button-choice, text, Basic Types | |
847 | @comment node-name, next, previous, up | |
848 | @subsection The @code{menu-choice} Widget | |
849 | @findex menu-choice@r{ widget} | |
850 | ||
851 | Syntax: | |
852 | ||
853 | @example | |
854 | @var{type} ::= (menu-choice [@var{keyword} @var{argument}]... @var{type} ... ) | |
855 | @end example | |
856 | ||
857 | The @var{type} argument represents each possible choice. The widget's | |
858 | value will be that of the chosen @var{type} argument. This widget will | |
859 | match any value matching at least one of the specified @var{type} | |
860 | arguments. | |
861 | ||
862 | @table @code | |
863 | @vindex void@r{ keyword} | |
864 | @item :void | |
865 | Widget type used as a fallback when the value does not match any of the | |
866 | specified @var{type} arguments. | |
867 | ||
868 | @vindex case-fold@r{ keyword} | |
869 | @item :case-fold | |
870 | Set this to @code{nil} if you don't want to ignore case when prompting for a | |
871 | choice through the minibuffer. | |
872 | ||
873 | @vindex children@r{ keyword} | |
874 | @item :children | |
875 | A list whose @sc{car} is the widget representing the currently chosen | |
876 | type in the buffer. | |
877 | ||
878 | @vindex choice@r{ keyword} | |
879 | @item :choice | |
880 | The current chosen type. | |
881 | ||
882 | @vindex args@r{ keyword} | |
883 | @item :args | |
884 | The list of types. | |
885 | @end table | |
886 | ||
887 | @node radio-button-choice, item, menu-choice, Basic Types | |
888 | @comment node-name, next, previous, up | |
889 | @subsection The @code{radio-button-choice} Widget | |
890 | @findex radio-button-choice@r{ widget} | |
891 | ||
892 | Syntax: | |
893 | ||
894 | @example | |
895 | @var{type} ::= (radio-button-choice [@var{keyword} @var{argument}]... @var{type} ... ) | |
896 | @end example | |
897 | ||
898 | The component types specify the choices, with one radio button for | |
899 | each. The widget's value will be that of the chosen @var{type} | |
900 | argument. This widget matches any value that matches at least one of | |
901 | the specified @var{type} arguments. | |
902 | ||
903 | The following extra properties are recognized. | |
904 | ||
905 | @table @code | |
906 | @vindex entry-format@r{ keyword} | |
907 | @item :entry-format | |
908 | This string will be inserted for each entry in the list. | |
909 | The following @samp{%} escapes are available: | |
910 | @table @samp | |
911 | @item %v | |
912 | Replace with the buffer representation of the @var{type} widget. | |
913 | @item %b | |
914 | Replace with the radio button. | |
915 | @item %% | |
916 | Insert a literal @samp{%}. | |
917 | @end table | |
918 | ||
919 | @vindex button-args@r{ keyword} | |
920 | @item :button-args | |
921 | A list of keywords to pass to the radio buttons. Useful for setting | |
922 | e.g.@: the @samp{:help-echo} for each button. | |
923 | ||
924 | @vindex buttons@r{ keyword} | |
925 | @item :buttons | |
926 | The widgets representing the radio buttons. | |
927 | ||
928 | @vindex children@r{ keyword} | |
929 | @item :children | |
930 | The widgets representing each type. | |
931 | ||
932 | @vindex choice@r{ keyword} | |
933 | @item :choice | |
934 | The current chosen type | |
935 | ||
936 | @vindex args@r{ keyword} | |
937 | @item :args | |
938 | The list of types. | |
939 | @end table | |
940 | ||
941 | You can add extra radio button items to a @code{radio-button-choice} | |
942 | widget after it has been created with the function | |
943 | @code{widget-radio-add-item}. | |
944 | ||
945 | @defun widget-radio-add-item widget type | |
946 | Add to @code{radio-button-choice} widget @var{widget} a new radio button | |
947 | item of type @var{type}. | |
948 | @end defun | |
949 | ||
950 | Please note that such items added after the @code{radio-button-choice} | |
951 | widget has been created will @strong{not} be properly destructed when | |
952 | you call @code{widget-delete}. | |
953 | ||
954 | @node item, choice-item, radio-button-choice, Basic Types | |
955 | @comment node-name, next, previous, up | |
956 | @subsection The @code{item} Widget | |
957 | @findex item@r{ widget} | |
958 | ||
959 | Syntax: | |
960 | ||
961 | @example | |
962 | @var{item} ::= (item [@var{keyword} @var{argument}]... @var{value}) | |
963 | @end example | |
964 | ||
965 | The @var{value}, if present, is used to initialize the @code{:value} | |
966 | property. The value should be a string, which will be inserted in the | |
967 | buffer. This widget will only match the specified value. | |
968 | ||
969 | @node choice-item, toggle, item, Basic Types | |
970 | @comment node-name, next, previous, up | |
971 | @subsection The @code{choice-item} Widget | |
972 | @findex choice-item@r{ widget} | |
973 | ||
974 | Syntax: | |
975 | ||
976 | @example | |
977 | @var{item} ::= (choice-item [@var{keyword} @var{argument}]... @var{value}) | |
978 | @end example | |
979 | ||
980 | The @var{value}, if present, is used to initialize the @code{:value} | |
981 | property. The value should be a string, which will be inserted in the | |
982 | buffer as a button. Activating the button of a @code{choice-item} is | |
983 | equivalent to activating the parent widget. This widget will only match | |
984 | the specified value. | |
985 | ||
986 | @node toggle, checkbox, choice-item, Basic Types | |
987 | @comment node-name, next, previous, up | |
988 | @subsection The @code{toggle} Widget | |
989 | @findex toggle@r{ widget} | |
990 | ||
991 | Syntax: | |
992 | ||
993 | @example | |
994 | @var{type} ::= (toggle [@var{keyword} @var{argument}]...) | |
995 | @end example | |
996 | ||
997 | The widget has two possible states, @samp{on} and @samp{off}, which | |
998 | correspond to a @code{t} or @code{nil} value, respectively. | |
999 | ||
1000 | The following extra properties are recognized: | |
1001 | ||
1002 | @table @code | |
1003 | @item :on | |
1004 | A string representing the @samp{on} state. By default the string | |
1005 | @samp{on}. | |
1006 | @item :off | |
1007 | A string representing the @samp{off} state. By default the string | |
1008 | @samp{off}. | |
1009 | @vindex on-glyph@r{ keyword} | |
1010 | @item :on-glyph | |
1011 | Name of a glyph to be used instead of the @samp{:on} text string, on | |
1012 | emacsen that supports this. | |
1013 | @vindex off-glyph@r{ keyword} | |
1014 | @item :off-glyph | |
1015 | Name of a glyph to be used instead of the @samp{:off} text string, on | |
1016 | emacsen that supports this. | |
1017 | @end table | |
1018 | ||
1019 | @node checkbox, checklist, toggle, Basic Types | |
1020 | @comment node-name, next, previous, up | |
1021 | @subsection The @code{checkbox} Widget | |
1022 | @findex checkbox@r{ widget} | |
1023 | ||
1024 | This widget has two possible states, @samp{selected} and | |
1025 | @samp{unselected}, which corresponds to a @code{t} or @code{nil} value. | |
1026 | ||
1027 | Syntax: | |
1028 | ||
1029 | @example | |
1030 | @var{type} ::= (checkbox [@var{keyword} @var{argument}]...) | |
1031 | @end example | |
1032 | ||
1033 | @node checklist, editable-list, checkbox, Basic Types | |
1034 | @comment node-name, next, previous, up | |
1035 | @subsection The @code{checklist} Widget | |
1036 | @findex checklist@r{ widget} | |
1037 | ||
1038 | Syntax: | |
1039 | ||
1040 | @example | |
1041 | @var{type} ::= (checklist [@var{keyword} @var{argument}]... @var{type} ... ) | |
1042 | @end example | |
1043 | ||
1044 | The @var{type} arguments represent each checklist item. The widget's | |
1045 | value will be a list containing the values of all checked @var{type} | |
1046 | arguments. The checklist widget will match a list whose elements all | |
1047 | match at least one of the specified @var{type} arguments. | |
1048 | ||
1049 | The following extra properties are recognized: | |
1050 | ||
1051 | @table @code | |
1052 | @vindex entry-format@r{ keyword} | |
1053 | @item :entry-format | |
1054 | This string will be inserted for each entry in the list. | |
1055 | The following @samp{%} escapes are available: | |
1056 | @table @samp | |
1057 | @item %v | |
1058 | Replaced with the buffer representation of the @var{type} widget. | |
1059 | @item %b | |
1060 | Replace with the checkbox. | |
1061 | @item %% | |
1062 | Insert a literal @samp{%}. | |
1063 | @end table | |
1064 | ||
1065 | @vindex greedy@r{ keyword} | |
1066 | @item :greedy | |
1067 | Usually a checklist will only match if the items are in the exact | |
1068 | sequence given in the specification. By setting @code{:greedy} to | |
1069 | non-@code{nil}, it will allow the items to come in any sequence. | |
1070 | However, if you extract the value they will be in the sequence given | |
1071 | in the checklist, i.e.@: the original sequence is forgotten. | |
1072 | ||
1073 | @vindex button-args@r{ keyword} | |
1074 | @item :button-args | |
1075 | A list of keywords to pass to the checkboxes. Useful for setting | |
1076 | e.g.@: the @samp{:help-echo} for each checkbox. | |
1077 | ||
1078 | @vindex buttons@r{ keyword} | |
1079 | @item :buttons | |
1080 | The widgets representing the checkboxes. | |
1081 | ||
1082 | @vindex children@r{ keyword} | |
1083 | @item :children | |
1084 | The widgets representing each type. | |
1085 | ||
1086 | @vindex args@r{ keyword} | |
1087 | @item :args | |
1088 | The list of types. | |
1089 | @end table | |
1090 | ||
1091 | @node editable-list, group, checklist, Basic Types | |
1092 | @comment node-name, next, previous, up | |
1093 | @subsection The @code{editable-list} Widget | |
1094 | @findex editable-list@r{ widget} | |
1095 | ||
1096 | Syntax: | |
1097 | ||
1098 | @example | |
1099 | @var{type} ::= (editable-list [@var{keyword} @var{argument}]... @var{type}) | |
1100 | @end example | |
1101 | ||
1102 | The value is a list, where each member represents one widget of type | |
1103 | @var{type}. | |
1104 | ||
1105 | The following extra properties are recognized: | |
1106 | ||
1107 | @table @code | |
1108 | @vindex entry-format@r{ keyword} | |
1109 | @item :entry-format | |
1110 | This string will be inserted for each entry in the list. | |
1111 | The following @samp{%} escapes are available: | |
1112 | @table @samp | |
1113 | @item %v | |
1114 | This will be replaced with the buffer representation of the @var{type} | |
1115 | widget. | |
1116 | @item %i | |
1117 | Insert the @b{[INS]} button. | |
1118 | @item %d | |
1119 | Insert the @b{[DEL]} button. | |
1120 | @item %% | |
1121 | Insert a literal @samp{%}. | |
1122 | @end table | |
1123 | ||
1124 | @vindex insert-button-args@r{ keyword} | |
1125 | @item :insert-button-args | |
1126 | A list of keyword arguments to pass to the insert buttons. | |
1127 | ||
1128 | @vindex delete-button-args@r{ keyword} | |
1129 | @item :delete-button-args | |
1130 | A list of keyword arguments to pass to the delete buttons. | |
1131 | ||
1132 | @vindex append-button-args@r{ keyword} | |
1133 | @item :append-button-args | |
1134 | A list of keyword arguments to pass to the trailing insert button. | |
1135 | ||
1136 | @vindex buttons@r{ keyword} | |
1137 | @item :buttons | |
1138 | The widgets representing the insert and delete buttons. | |
1139 | ||
1140 | @vindex children@r{ keyword} | |
1141 | @item :children | |
1142 | The widgets representing the elements of the list. | |
1143 | ||
1144 | @vindex args@r{ keyword} | |
1145 | @item :args | |
1146 | List whose @sc{car} is the type of the list elements. | |
1147 | @end table | |
1148 | ||
1149 | @node group, , editable-list, Basic Types | |
1150 | @comment node-name, next, previous, up | |
1151 | @subsection The @code{group} Widget | |
1152 | @findex group@r{ widget} | |
1153 | ||
1154 | This widget simply group other widgets together. | |
1155 | ||
1156 | Syntax: | |
1157 | ||
1158 | @example | |
1159 | @var{type} ::= (group [@var{keyword} @var{argument}]... @var{type}...) | |
1160 | @end example | |
1161 | ||
1162 | The value is a list, with one member for each @var{type}. | |
1163 | ||
1164 | @node Sexp Types, Widget Properties, Basic Types, Top | |
1165 | @comment | |
1166 | @section Sexp Types | |
1167 | @cindex sexp types | |
1168 | ||
1169 | A number of widgets for editing @dfn{s-expressions} (Lisp types), sexp | |
1170 | for short, are also available. These basically fall in several | |
1171 | categories described in this section. | |
1172 | ||
1173 | @menu | |
1174 | * constants:: | |
1175 | * generic:: | |
1176 | * atoms:: | |
1177 | * composite:: | |
1178 | @end menu | |
1179 | ||
1180 | @node constants, generic, Sexp Types, Sexp Types | |
1181 | @comment node-name, next, previous, up | |
1182 | @subsection The Constant Widgets | |
1183 | @cindex constant widgets | |
1184 | ||
1185 | The @code{const} widget can contain any Lisp expression, but the user is | |
1186 | prohibited from editing it, which is mainly useful as a component of one | |
1187 | of the composite widgets. | |
1188 | ||
1189 | The syntax for the @code{const} widget is: | |
1190 | ||
1191 | @example | |
1192 | @var{type} ::= (const [@var{keyword} @var{argument}]... [ @var{value} ]) | |
1193 | @end example | |
1194 | ||
1195 | The @var{value}, if present, is used to initialize the @code{:value} | |
1196 | property and can be any s-expression. | |
1197 | ||
1198 | @deffn Widget const | |
1199 | This will display any valid s-expression in an immutable part of the | |
1200 | buffer. | |
1201 | @end deffn | |
1202 | ||
1203 | There are two variations of the @code{const} widget, namely | |
1204 | @code{variable-item} and @code{function-item}. These should contain a | |
1205 | symbol with a variable or function binding. The major difference from | |
1206 | the @code{const} widget is that they will allow the user to see the | |
1207 | variable or function documentation for the symbol. | |
1208 | ||
1209 | @deffn Widget variable-item | |
1210 | An immutable symbol that is bound as a variable. | |
1211 | @end deffn | |
1212 | ||
1213 | @deffn Widget function-item | |
1214 | An immutable symbol that is bound as a function. | |
1215 | @end deffn | |
1216 | ||
1217 | @node generic, atoms, constants, Sexp Types | |
1218 | @comment node-name, next, previous, up | |
1219 | @subsection Generic Sexp Widget | |
1220 | @cindex generic sexp widget | |
1221 | ||
1222 | The @code{sexp} widget can contain any Lisp expression, and allows the | |
1223 | user to edit it inline in the buffer. | |
1224 | ||
1225 | The syntax for the @code{sexp} widget is: | |
1226 | ||
1227 | @example | |
1228 | @var{type} ::= (sexp [@var{keyword} @var{argument}]... [ @var{value} ]) | |
1229 | @end example | |
1230 | ||
1231 | @deffn Widget sexp | |
1232 | This will allow you to edit any valid s-expression in an editable buffer | |
1233 | field. | |
1234 | ||
1235 | The @code{sexp} widget takes the same keyword arguments as the | |
1236 | @code{editable-field} widget. @xref{editable-field}. | |
1237 | @end deffn | |
1238 | ||
1239 | @node atoms, composite, generic, Sexp Types | |
1240 | @comment node-name, next, previous, up | |
1241 | @subsection Atomic Sexp Widgets | |
1242 | @cindex atomic sexp widget | |
1243 | ||
1244 | The atoms are s-expressions that do not consist of other s-expressions. | |
1245 | For example, a string, a file name, or a symbol are atoms, while a list | |
1246 | is a composite type. You can edit the value of an atom with the | |
1247 | following widgets. | |
1248 | ||
1249 | The syntax for all the atoms are: | |
1250 | ||
1251 | @example | |
1252 | @var{type} ::= (@var{construct} [@var{keyword} @var{argument}]... [ @var{value} ]) | |
1253 | @end example | |
1254 | ||
1255 | The @var{value}, if present, is used to initialize the @code{:value} | |
1256 | property and must be an expression of the same type as the widget. | |
1257 | That is, the string widget can only be initialized with a string. | |
1258 | ||
1259 | All the atom widgets take the same keyword arguments as the | |
1260 | @code{editable-field} widget. @xref{editable-field}. | |
1261 | ||
1262 | @deffn Widget string | |
1263 | Allows you to edit a string in an editable field. | |
1264 | @end deffn | |
1265 | ||
1266 | @deffn Widget regexp | |
1267 | Allows you to edit a regular expression in an editable field. | |
1268 | @end deffn | |
1269 | ||
1270 | @deffn Widget character | |
1271 | Allows you to enter a character in an editable field. | |
1272 | @end deffn | |
1273 | ||
1274 | @deffn Widget file | |
1275 | Allows you to edit a file name in an editable field. | |
1276 | ||
1277 | Keywords: | |
1278 | @table @code | |
1279 | @vindex must-match@r{ keyword} | |
1280 | @item :must-match | |
1281 | If this is set to non-@code{nil}, only existing file names will be | |
1282 | allowed in the minibuffer. | |
1283 | @end table | |
1284 | @end deffn | |
1285 | ||
1286 | @deffn Widget directory | |
1287 | Allows you to edit a directory name in an editable field. | |
1288 | Similar to the @code{file} widget. | |
1289 | @end deffn | |
1290 | ||
1291 | @deffn Widget symbol | |
1292 | Allows you to edit a Lisp symbol in an editable field. | |
1293 | @end deffn | |
1294 | ||
1295 | @deffn Widget function | |
1296 | Allows you to edit a lambda expression, or a function name with completion. | |
1297 | @end deffn | |
1298 | ||
1299 | @deffn Widget variable | |
1300 | Allows you to edit a variable name, with completion. | |
1301 | @end deffn | |
1302 | ||
1303 | @deffn Widget integer | |
1304 | Allows you to edit an integer in an editable field. | |
1305 | @end deffn | |
1306 | ||
1307 | @deffn Widget number | |
1308 | Allows you to edit a number in an editable field. | |
1309 | @end deffn | |
1310 | ||
1311 | @deffn Widget boolean | |
1312 | Allows you to edit a boolean. In Lisp this means a variable which is | |
1313 | either @code{nil} meaning false, or non-@code{nil} meaning true. | |
1314 | @end deffn | |
1315 | ||
1316 | ||
1317 | @node composite, , atoms, Sexp Types | |
1318 | @comment node-name, next, previous, up | |
1319 | @subsection Composite Sexp Widgets | |
1320 | @cindex composite sexp widgets | |
1321 | ||
1322 | The syntax for the composite widget construct is: | |
1323 | ||
1324 | @example | |
1325 | @var{type} ::= (@var{construct} [@var{keyword} @var{argument}]... @var{component}...) | |
1326 | @end example | |
1327 | ||
1328 | @noindent | |
1329 | where each @var{component} must be a widget type. Each component widget | |
1330 | will be displayed in the buffer, and will be editable by the user. | |
1331 | ||
1332 | @deffn Widget cons | |
1333 | The value of a @code{cons} widget must be a cons-cell whose @sc{car} | |
1334 | and @sc{cdr} have two specified types. It uses this syntax: | |
1335 | ||
1336 | @example | |
1337 | @var{type} ::= (cons [@var{keyword} @var{argument}]... @var{car-type} @var{cdr-type}) | |
1338 | @end example | |
1339 | @end deffn | |
1340 | ||
1341 | @deffn Widget choice | |
1342 | The value matched by a @code{choice} widget must have one of a fixed | |
1343 | set of types. The widget's syntax is as follows: | |
1344 | ||
1345 | @example | |
1346 | @var{type} ::= (choice [@var{keyword} @var{argument}]... @var{type} ... ) | |
1347 | @end example | |
1348 | ||
1349 | The value of a @code{choice} widget can be anything that matches any of the | |
1350 | @var{types}. | |
1351 | @end deffn | |
1352 | ||
1353 | @deffn Widget list | |
1354 | The value of a @code{list} widget must be a list whose element types | |
1355 | match the specified component types: | |
1356 | ||
1357 | @example | |
1358 | @var{type} ::= (list [@var{keyword} @var{argument}]... @var{component-type}...) | |
1359 | @end example | |
1360 | ||
1361 | Thus, @code{(list string number)} matches lists of two elements, | |
1362 | the first being a string and the second being a number. | |
1363 | @end deffn | |
1364 | ||
1365 | @deffn Widget vector | |
1366 | The @code{vector} widget is like the @code{list} widget but matches | |
1367 | vectors instead of lists. Thus, @code{(vector string number)} matches | |
1368 | vectors of two elements, the first being a string and the second being | |
1369 | a number. | |
1370 | @end deffn | |
1371 | ||
1372 | The above suffice for specifying fixed size lists and vectors. To get | |
1373 | variable length lists and vectors, you can use a @code{choice}, | |
1374 | @code{set}, or @code{repeat} widget together with the @code{:inline} | |
1375 | keyword. If any component of a composite widget has the | |
1376 | @code{:inline} keyword set, its value must be a list which will then | |
1377 | be spliced into the composite. For example, to specify a list whose | |
1378 | first element must be a file name, and whose remaining elements should | |
1379 | either be the symbol @code{t} or two strings (file names), you can use | |
1380 | the following widget specification: | |
1381 | ||
1382 | @example | |
1383 | (list file | |
1384 | (choice (const t) | |
1385 | (list :inline t | |
1386 | :value ("foo" "bar") | |
1387 | string string))) | |
1388 | @end example | |
1389 | ||
1390 | The value of a widget of this type will either have the form | |
1391 | @code{(file t)} or @code{(file @var{string} @var{string})}. | |
1392 | ||
1393 | This concept of @code{:inline} may be hard to understand. It was | |
1394 | certainly hard to implement, so instead of confusing you more by | |
1395 | trying to explain it here, I'll just suggest you meditate over it for | |
1396 | a while. | |
1397 | ||
1398 | @deffn Widget set | |
1399 | Specifies a type whose values are the lists whose elements all belong | |
1400 | to a given set. The order of elements of the list is not significant. | |
1401 | Here's the syntax: | |
1402 | ||
1403 | @example | |
1404 | @var{type} ::= (set [@var{keyword} @var{argument}]... @var{permitted-element} ... ) | |
1405 | @end example | |
1406 | ||
1407 | Use @code{const} to specify each permitted element, like this: | |
1408 | @code{(set (const a) (const b))}. | |
1409 | @end deffn | |
1410 | ||
1411 | @deffn Widget repeat | |
1412 | Specifies a list of any number of elements that fit a certain type. | |
1413 | ||
1414 | @example | |
1415 | @var{type} ::= (repeat [@var{keyword} @var{argument}]... @var{type}) | |
1416 | @end example | |
1417 | @end deffn | |
1418 | ||
1419 | @node Widget Properties, Defining New Widgets, Sexp Types, Top | |
1420 | @comment node-name, next, previous, up | |
1421 | @section Properties | |
1422 | @cindex properties of widgets | |
1423 | @cindex widget properties | |
1424 | ||
1425 | You can examine or set the value of a widget by using the widget object | |
1426 | that was returned by @code{widget-create}. | |
1427 | ||
1428 | @defun widget-value widget | |
1429 | Return the current value contained in @var{widget}. | |
1430 | It is an error to call this function on an uninitialized widget. | |
1431 | @end defun | |
1432 | ||
1433 | @defun widget-value-set widget value | |
1434 | Set the value contained in @var{widget} to @var{value}. | |
1435 | It is an error to call this function with an invalid @var{value}. | |
1436 | @end defun | |
1437 | ||
1438 | @strong{Important:} You @emph{must} call @code{widget-setup} after | |
1439 | modifying the value of a widget before the user is allowed to edit the | |
1440 | widget again. It is enough to call @code{widget-setup} once if you | |
1441 | modify multiple widgets. This is currently only necessary if the widget | |
1442 | contains an editing field, but may be necessary for other widgets in the | |
1443 | future. | |
1444 | ||
1445 | If your application needs to associate some information with the widget | |
1446 | objects, for example a reference to the item being edited, it can be | |
1447 | done with @code{widget-put} and @code{widget-get}. The property names | |
1448 | must begin with a @samp{:}. | |
1449 | ||
1450 | @defun widget-put widget property value | |
1451 | In @var{widget} set @var{property} to @var{value}. | |
1452 | @var{property} should be a symbol, while @var{value} can be anything. | |
1453 | @end defun | |
1454 | ||
1455 | @defun widget-get widget property | |
1456 | In @var{widget} return the value for @var{property}. | |
1457 | @var{property} should be a symbol, the value is what was last set by | |
1458 | @code{widget-put} for @var{property}. | |
1459 | @end defun | |
1460 | ||
1461 | @defun widget-member widget property | |
1462 | Non-@code{nil} if @var{widget} has a value (even @code{nil}) for | |
1463 | property @var{property}. | |
1464 | @end defun | |
1465 | ||
1466 | Occasionally it can be useful to know which kind of widget you have, | |
1467 | i.e.@: the name of the widget type you gave when the widget was created. | |
1468 | ||
1469 | @defun widget-type widget | |
1470 | Return the name of @var{widget}, a symbol. | |
1471 | @end defun | |
1472 | ||
1473 | @cindex active widget | |
1474 | @cindex inactive widget | |
1475 | @cindex activate a widget | |
1476 | @cindex deactivate a widget | |
1477 | Widgets can be in two states: active, which means they are modifiable by | |
1478 | the user, or inactive, which means they cannot be modified by the user. | |
1479 | You can query or set the state with the following code: | |
1480 | ||
1481 | @lisp | |
1482 | ;; Examine if @var{widget} is active or not. | |
1483 | (if (widget-apply @var{widget} :active) | |
1484 | (message "Widget is active.") | |
1485 | (message "Widget is inactive.") | |
1486 | ||
1487 | ;; Make @var{widget} inactive. | |
1488 | (widget-apply @var{widget} :deactivate) | |
1489 | ||
1490 | ;; Make @var{widget} active. | |
1491 | (widget-apply @var{widget} :activate) | |
1492 | @end lisp | |
1493 | ||
1494 | A widget is inactive if it, or any of its ancestors (found by | |
1495 | following the @code{:parent} link), have been deactivated. To make sure | |
1496 | a widget is really active, you must therefore activate both it and | |
1497 | all its ancestors. | |
1498 | ||
1499 | @lisp | |
1500 | (while widget | |
1501 | (widget-apply widget :activate) | |
1502 | (setq widget (widget-get widget :parent))) | |
1503 | @end lisp | |
1504 | ||
1505 | You can check if a widget has been made inactive by examining the value | |
1506 | of the @code{:inactive} keyword. If this is non-@code{nil}, the widget itself | |
1507 | has been deactivated. This is different from using the @code{:active} | |
1508 | keyword, in that the latter tells you if the widget @strong{or} any of | |
1509 | its ancestors have been deactivated. Do not attempt to set the | |
1510 | @code{:inactive} keyword directly. Use the @code{:activate} | |
1511 | @code{:deactivate} keywords instead. | |
1512 | ||
1513 | ||
1514 | @node Defining New Widgets, Widget Browser, Widget Properties, Top | |
1515 | @comment node-name, next, previous, up | |
1516 | @section Defining New Widgets | |
1517 | @cindex new widgets | |
1518 | @cindex defining new widgets | |
1519 | ||
1520 | You can define specialized widgets with @code{define-widget}. It allows | |
1521 | you to create a shorthand for more complex widgets, including specifying | |
1522 | component widgets and new default values for the keyword | |
1523 | arguments. | |
1524 | ||
1525 | @defun define-widget name class doc &rest args | |
1526 | Define a new widget type named @var{name} from @code{class}. | |
1527 | ||
1528 | @var{name} and class should both be symbols, @code{class} should be one | |
1529 | of the existing widget types. | |
1530 | ||
1531 | The third argument @var{doc} is a documentation string for the widget. | |
1532 | ||
1533 | After the new widget has been defined, the following two calls will | |
1534 | create identical widgets: | |
1535 | ||
1536 | @itemize @bullet | |
1537 | @item | |
1538 | @lisp | |
1539 | (widget-create @var{name}) | |
1540 | @end lisp | |
1541 | ||
1542 | @item | |
1543 | @lisp | |
1544 | (apply widget-create @var{class} @var{args}) | |
1545 | @end lisp | |
1546 | @end itemize | |
1547 | ||
1548 | @end defun | |
1549 | ||
1550 | Using @code{define-widget} just stores the definition of the widget type | |
1551 | in the @code{widget-type} property of @var{name}, which is what | |
1552 | @code{widget-create} uses. | |
1553 | ||
1554 | If you only want to specify defaults for keywords with no complex | |
1555 | conversions, you can use @code{identity} as your conversion function. | |
1556 | ||
1557 | The following additional keyword arguments are useful when defining new | |
1558 | widgets: | |
1559 | @table @code | |
1560 | @vindex convert-widget@r{ keyword} | |
1561 | @item :convert-widget | |
1562 | Function to convert a widget type before creating a widget of that | |
1563 | type. It takes a widget type as an argument, and returns the converted | |
1564 | widget type. When a widget is created, this function is called for the | |
1565 | widget type and all the widget's parent types, most derived first. | |
1566 | ||
1567 | The following predefined functions can be used here: | |
1568 | ||
1569 | @defun widget-types-convert-widget widget | |
1570 | Convert @code{:args} as widget types in @var{widget}. | |
1571 | @end defun | |
1572 | ||
1573 | @defun widget-value-convert-widget widget | |
1574 | Initialize @code{:value} from @code{:args} in @var{widget}. | |
1575 | @end defun | |
1576 | ||
1577 | @vindex copy@r{ keyword} | |
1578 | @item :copy | |
1579 | Function to deep copy a widget type. It takes a shallow copy of the | |
1580 | widget type as an argument (made by @code{copy-sequence}), and returns a | |
1581 | deep copy. The purpose of this is to avoid having different instances | |
1582 | of combined widgets share nested attributes. | |
1583 | ||
1584 | The following predefined functions can be used here: | |
1585 | ||
1586 | @defun widget-types-copy widget | |
1587 | Copy @code{:args} as widget types in @var{widget}. | |
1588 | @end defun | |
1589 | ||
1590 | @vindex value-to-internal@r{ keyword} | |
1591 | @item :value-to-internal | |
1592 | Function to convert the value to the internal format. The function | |
1593 | takes two arguments, a widget and an external value, and returns the | |
1594 | internal value. The function is called on the present @code{:value} | |
1595 | when the widget is created, and on any value set later with | |
1596 | @code{widget-value-set}. | |
1597 | ||
1598 | @vindex value-to-external@r{ keyword} | |
1599 | @item :value-to-external | |
1600 | Function to convert the value to the external format. The function | |
1601 | takes two arguments, a widget and an internal value, and returns the | |
1602 | external value. The function is called on the present @code{:value} | |
1603 | when the widget is created, and on any value set later with | |
1604 | @code{widget-value-set}. | |
1605 | ||
1606 | @vindex create@r{ keyword} | |
1607 | @item :create | |
1608 | Function to create a widget from scratch. The function takes one | |
1609 | argument, a widget type, and creates a widget of that type, inserts it | |
1610 | in the buffer, and returns a widget object. | |
1611 | ||
1612 | @vindex delete@r{ keyword} | |
1613 | @item :delete | |
1614 | Function to delete a widget. The function takes one argument, a widget, | |
1615 | and should remove all traces of the widget from the buffer. | |
1616 | ||
1617 | The default value is: | |
1618 | ||
1619 | @defun widget-default-delete widget | |
1620 | Remove @var{widget} from the buffer. | |
1621 | Delete all @code{:children} and @code{:buttons} in @var{widget}. | |
1622 | @end defun | |
1623 | ||
1624 | In most cases you should not change this value, but instead use | |
1625 | @code{:value-delete} to make any additional cleanup. | |
1626 | ||
1627 | @vindex value-create@r{ keyword} | |
1628 | @item :value-create | |
1629 | Function to expand the @samp{%v} escape in the format string. It will | |
1630 | be called with the widget as its argument and should insert a | |
1631 | representation of the widget's value in the buffer. | |
1632 | ||
1633 | Nested widgets should be listed in @code{:children} or @code{:buttons} | |
1634 | to make sure they are automatically deleted. | |
1635 | ||
1636 | @vindex value-delete@r{ keyword} | |
1637 | @item :value-delete | |
1638 | Should remove the representation of the widget's value from the buffer. | |
1639 | It will be called with the widget as its argument. It doesn't have to | |
1640 | remove the text, but it should release markers and delete nested widgets | |
1641 | if these are not listed in @code{:children} or @code{:buttons}. | |
1642 | ||
1643 | @vindex value-get@r{ keyword} | |
1644 | @item :value-get | |
1645 | Function to extract the value of a widget, as it is displayed in the | |
1646 | buffer. | |
1647 | ||
1648 | The following predefined function can be used here: | |
1649 | ||
1650 | @defun widget-value-value-get widget | |
1651 | Return the @code{:value} property of @var{widget}. | |
1652 | @end defun | |
1653 | ||
1654 | @vindex format-handler@r{ keyword} | |
1655 | @item :format-handler | |
1656 | Function to handle unknown @samp{%} escapes in the format string. It | |
1657 | will be called with the widget and the character that follows the | |
1658 | @samp{%} as arguments. You can set this to allow your widget to handle | |
1659 | non-standard escapes. | |
1660 | ||
1661 | @findex widget-default-format-handler | |
1662 | You should end up calling @code{widget-default-format-handler} to handle | |
1663 | unknown escape sequences, which will handle the @samp{%h} and any future | |
1664 | escape sequences, as well as give an error for unknown escapes. | |
1665 | ||
1666 | @vindex action@r{ keyword} | |
1667 | @item :action | |
1668 | Function to handle user initiated events. By default, @code{:notify} | |
1669 | the parent. | |
1670 | ||
1671 | The following predefined function can be used here: | |
1672 | ||
1673 | @defun widget-parent-action widget &optional event | |
1674 | Tell @code{:parent} of @var{widget} to handle the @code{:action}. | |
1675 | Optional @var{event} is the event that triggered the action. | |
1676 | @end defun | |
1677 | ||
1678 | @vindex prompt-value@r{ keyword} | |
1679 | @item :prompt-value | |
1680 | Function to prompt for a value in the minibuffer. The function should | |
1681 | take four arguments, @var{widget}, @var{prompt}, @var{value}, and | |
1682 | @var{unbound} and should return a value for widget entered by the user. | |
1683 | @var{prompt} is the prompt to use. @var{value} is the default value to | |
1684 | use, unless @var{unbound} is non-@code{nil}, in which case there is no default | |
1685 | value. The function should read the value using the method most natural | |
1686 | for this widget, and does not have to check that it matches. | |
1687 | @end table | |
1688 | ||
1689 | If you want to define a new widget from scratch, use the @code{default} | |
1690 | widget as its base. | |
1691 | ||
1692 | @deffn Widget default | |
1693 | Widget used as a base for other widgets. | |
1694 | ||
1695 | It provides most of the functionality that is referred to as ``by | |
1696 | default'' in this text. | |
1697 | @end deffn | |
1698 | ||
1699 | @node Widget Browser, Widget Minor Mode, Defining New Widgets, Top | |
1700 | @comment node-name, next, previous, up | |
1701 | @section Widget Browser | |
1702 | @cindex widget browser | |
1703 | ||
1704 | There is a separate package to browse widgets. This is intended to help | |
1705 | programmers who want to examine the content of a widget. The browser | |
1706 | shows the value of each keyword, but uses links for certain keywords | |
1707 | such as @samp{:parent}, which avoids printing cyclic structures. | |
1708 | ||
1709 | @deffn Command widget-browse @var{widget} | |
1710 | Create a widget browser for @var{widget}. | |
1711 | When called interactively, prompt for @var{widget}. | |
1712 | @end deffn | |
1713 | ||
1714 | @deffn Command widget-browse-other-window @var{widget} | |
1715 | Create a widget browser for @var{widget} and show it in another window. | |
1716 | When called interactively, prompt for @var{widget}. | |
1717 | @end deffn | |
1718 | ||
1719 | @deffn Command widget-browse-at @var{pos} | |
1720 | Create a widget browser for the widget at @var{pos}. | |
1721 | When called interactively, use the position of point. | |
1722 | @end deffn | |
1723 | ||
1724 | @node Widget Minor Mode, Utilities, Widget Browser, Top | |
1725 | @comment node-name, next, previous, up | |
1726 | @section Widget Minor Mode | |
1727 | @cindex widget minor mode | |
1728 | ||
1729 | There is a minor mode for manipulating widgets in major modes that | |
1730 | don't provide any support for widgets themselves. This is mostly | |
1731 | intended to be useful for programmers doing experiments. | |
1732 | ||
1733 | @deffn Command widget-minor-mode | |
1734 | Toggle minor mode for traversing widgets. | |
1735 | With arg, turn widget mode on if and only if arg is positive. | |
1736 | @end deffn | |
1737 | ||
1738 | @defvar widget-minor-mode-keymap | |
1739 | Keymap used in @code{widget-minor-mode}. | |
1740 | @end defvar | |
1741 | ||
1742 | @node Utilities, Widget Wishlist, Widget Minor Mode, Top | |
1743 | @comment node-name, next, previous, up | |
1744 | @section Utilities. | |
1745 | @cindex utility functions for widgets | |
1746 | ||
1747 | @defun widget-prompt-value widget prompt [ value unbound ] | |
1748 | Prompt for a value matching @var{widget}, using @var{prompt}. | |
1749 | The current value is assumed to be @var{value}, unless @var{unbound} is | |
1750 | non-@code{nil}.@refill | |
1751 | @end defun | |
1752 | ||
1753 | @defun widget-get-sibling widget | |
1754 | Get the item which @var{widget} is assumed to toggle. | |
1755 | This is only meaningful for radio buttons or checkboxes in a list. | |
1756 | @end defun | |
1757 | ||
1758 | @node Widget Wishlist, GNU Free Documentation License, Utilities, Top | |
1759 | @comment node-name, next, previous, up | |
1760 | @section Wishlist | |
1761 | @cindex todo | |
1762 | ||
1763 | @itemize @bullet | |
1764 | @item | |
1765 | It should be possible to add or remove items from a list with @kbd{C-k} | |
1766 | and @kbd{C-o} (suggested by @sc{rms}). | |
1767 | ||
1768 | @item | |
1769 | The @samp{[INS]} and @samp{[DEL]} buttons should be replaced by a single | |
1770 | dash (@samp{-}). The dash should be a button that, when invoked, asks | |
1771 | whether you want to add or delete an item (@sc{rms} wanted to git rid of | |
1772 | the ugly buttons, the dash is my idea). | |
1773 | ||
1774 | @item | |
1775 | The @code{menu-choice} tag should be prettier, something like the abbreviated | |
1776 | menus in Open Look. | |
1777 | ||
1778 | @item | |
1779 | Finish @code{:tab-order}. | |
1780 | ||
1781 | @item | |
1782 | Make indentation work with glyphs and proportional fonts. | |
1783 | ||
1784 | @item | |
1785 | Add commands to show overview of object and class hierarchies to the | |
1786 | browser. | |
1787 | ||
1788 | @item | |
1789 | Find a way to disable mouse highlight for inactive widgets. | |
1790 | ||
1791 | @item | |
1792 | Find a way to make glyphs look inactive. | |
1793 | ||
1794 | @item | |
1795 | Add @code{property-list} widget. | |
1796 | ||
1797 | @item | |
1798 | Add @code{association-list} widget. | |
1799 | ||
1800 | @item | |
1801 | Add @code{key-binding} widget. | |
1802 | ||
1803 | @item | |
1804 | Add @code{widget} widget for editing widget specifications. | |
1805 | ||
1806 | @item | |
1807 | Find clean way to implement variable length list. | |
1808 | See @code{TeX-printer-list} for an explanation. | |
1809 | ||
1810 | @item | |
1811 | @kbd{C-h} in @code{widget-prompt-value} should give type specific help. | |
1812 | ||
1813 | @item | |
1814 | Add a @code{mailto} widget. | |
1815 | @end itemize | |
1816 | ||
1817 | @node GNU Free Documentation License, Index, Widget Wishlist, Top | |
1818 | @appendix GNU Free Documentation License | |
1819 | @include doclicense.texi | |
1820 | ||
1821 | @node Index, , GNU Free Documentation License, Top | |
1822 | @comment node-name, next, previous, up | |
1823 | @unnumbered Index | |
1824 | ||
1825 | This is an alphabetical listing of all concepts, functions, commands, | |
1826 | variables, and widgets described in this manual. | |
1827 | @printindex cp | |
1828 | ||
4009494e | 1829 | @bye |