|
98
|
1 \input texinfo.tex
|
|
|
2
|
|
120
|
3 @c $Id: widget.texi,v 1.12 1997/04/10 05:56:22 steve Exp $
|
|
98
|
4
|
|
|
5 @c %**start of header
|
|
|
6 @setfilename widget
|
|
|
7 @settitle The Emacs Widget Library
|
|
|
8 @iftex
|
|
|
9 @afourpaper
|
|
|
10 @headings double
|
|
|
11 @end iftex
|
|
|
12 @c %**end of header
|
|
|
13
|
|
|
14 @node Top, Introduction, (dir), (dir)
|
|
|
15 @comment node-name, next, previous, up
|
|
|
16 @top The Emacs Widget Library
|
|
|
17
|
|
120
|
18 Version: 1.74
|
|
98
|
19
|
|
|
20 @menu
|
|
|
21 * Introduction::
|
|
|
22 * User Interface::
|
|
|
23 * Programming Example::
|
|
|
24 * Setting Up the Buffer::
|
|
|
25 * Basic Types::
|
|
|
26 * Sexp Types::
|
|
|
27 * Widget Properties::
|
|
|
28 * Defining New Widgets::
|
|
|
29 * Widget Wishlist.::
|
|
|
30 @end menu
|
|
|
31
|
|
|
32 @node Introduction, User Interface, Top, Top
|
|
|
33 @comment node-name, next, previous, up
|
|
|
34 @section Introduction
|
|
|
35
|
|
|
36 Most graphical user interface toolkits, such as Motif and XView, provide
|
|
|
37 a number of standard user interface controls (sometimes known as
|
|
|
38 `widgets' or `gadgets'). Emacs doesn't really support anything like
|
|
|
39 this, except for an incredible powerful text ``widget''. On the other
|
|
|
40 hand, Emacs does provide the necessary primitives to implement many
|
|
|
41 other widgets within a text buffer. The @code{widget} package
|
|
|
42 simplifies this task.
|
|
|
43
|
|
|
44 The basic widgets are:
|
|
|
45
|
|
|
46 @table @code
|
|
|
47 @item link
|
|
|
48 Areas of text with an associated action. Intended for hypertext links
|
|
|
49 embedded in text.
|
|
|
50 @item push-button
|
|
|
51 Like link, but intended for stand-alone buttons.
|
|
|
52 @item editable-field
|
|
|
53 An editable text field. It can be either variable or fixed length.
|
|
|
54 @item menu-choice
|
|
|
55 Allows the user to choose one of multiple options from a menu, each
|
|
|
56 option is itself a widget. Only the selected option will be visible in
|
|
|
57 the buffer.
|
|
|
58 @item radio-button-choice
|
|
|
59 Allows the user to choose one of multiple options by pushing radio
|
|
|
60 buttons. The options are implemented as widgets. All options will be
|
|
|
61 visible in the buffer.
|
|
|
62 @item item
|
|
|
63 A simple constant widget intended to be used in the @code{menu-choice} and
|
|
|
64 @code{radio-button-choice} widgets.
|
|
|
65 @item choice-item
|
|
|
66 An button item only intended for use in choices. When pushed, the user
|
|
|
67 will be asked to select another option from the choice widget.
|
|
|
68 @item toggle
|
|
|
69 A simple @samp{on}/@samp{off} switch.
|
|
|
70 @item checkbox
|
|
|
71 A checkbox (@samp{[ ]}/@samp{[X]}).
|
|
|
72 @item editable-list
|
|
|
73 Create an editable list. The user can insert or delete items in the
|
|
|
74 list. Each list item is itself a widget.
|
|
|
75 @end table
|
|
|
76
|
|
|
77 Now of what possible use can support for widgets be in a text editor?
|
|
|
78 I'm glad you asked. The answer is that widgets are useful for
|
|
|
79 implementing forms. A @dfn{form} in emacs is a buffer where the user is
|
|
|
80 supposed to fill out a number of fields, each of which has a specific
|
|
|
81 meaning. The user is not supposed to change or delete any of the text
|
|
|
82 between the fields. Examples of forms in Emacs are the @file{forms}
|
|
|
83 package (of course), the customize buffers, the mail and news compose
|
|
|
84 modes, and the @sc{html} form support in the @file{w3} browser.
|
|
|
85
|
|
|
86 The advantages for a programmer of using the @code{widget} package to
|
|
|
87 implement forms are:
|
|
|
88
|
|
|
89 @enumerate
|
|
|
90 @item
|
|
|
91 More complex field than just editable text are supported.
|
|
|
92 @item
|
|
|
93 You can give the user immediate feedback if he enters invalid data in a
|
|
|
94 text field, and sometimes prevent entering invalid data.
|
|
|
95 @item
|
|
|
96 You can have fixed sized fields, thus allowing multiple field to be
|
|
|
97 lined up in columns.
|
|
|
98 @item
|
|
|
99 It is simple to query or set the value of a field.
|
|
|
100 @item
|
|
|
101 Editing happens in buffer, not in the mini-buffer.
|
|
|
102 @item
|
|
|
103 Packages using the library get a uniform look, making them easier for
|
|
|
104 the user to learn.
|
|
|
105 @item
|
|
|
106 As support for embedded graphics improve, the widget library will
|
|
|
107 extended to support it. This means that your code using the widget
|
|
|
108 library will also use the new graphic features by automatic.
|
|
|
109 @end enumerate
|
|
|
110
|
|
|
111 In order to minimize the code that is loaded by users who does not
|
|
|
112 create any widgets, the code has been split in two files:
|
|
|
113
|
|
|
114 @table @file
|
|
|
115 @item widget.el
|
|
|
116 This will declare the user variables, define the function
|
|
|
117 @code{widget-define}, and autoload the function @code{widget-create}.
|
|
106
|
118 @item wid-edit.el
|
|
98
|
119 Everything else is here, there is no reason to load it explicitly, as
|
|
|
120 it will be autoloaded when needed.
|
|
|
121 @end table
|
|
|
122
|
|
|
123 @node User Interface, Programming Example, Introduction, Top
|
|
|
124 @comment node-name, next, previous, up
|
|
|
125 @section User Interface
|
|
|
126
|
|
|
127 A form consist of read only text for documentation and some fields,
|
|
|
128 where each the fields contain two parts, as tag and a value. The tags
|
|
|
129 are used to identify the fields, so the documentation can refer to the
|
|
|
130 foo field, meaning the field tagged with @samp{Foo}. Here is an example
|
|
|
131 form:
|
|
|
132
|
|
|
133 @example
|
|
|
134 Here is some documentation.
|
|
|
135
|
|
|
136 Name: @i{My Name} @strong{Choose}: This option
|
|
|
137 Address: @i{Some Place
|
|
|
138 In some City
|
|
|
139 Some country.}
|
|
|
140
|
|
|
141 See also @b{_other work_} for more information.
|
|
|
142
|
|
|
143 Numbers: count to three below
|
|
|
144 @b{[INS]} @b{[DEL]} @i{One}
|
|
|
145 @b{[INS]} @b{[DEL]} @i{Eh, two?}
|
|
|
146 @b{[INS]} @b{[DEL]} @i{Five!}
|
|
|
147 @b{[INS]}
|
|
|
148
|
|
|
149 Select multiple:
|
|
|
150
|
|
|
151 @b{[X]} This
|
|
|
152 @b{[ ]} That
|
|
|
153 @b{[X]} Thus
|
|
|
154
|
|
|
155 Select one:
|
|
|
156
|
|
|
157 @b{(*)} One
|
|
|
158 @b{( )} Another One.
|
|
|
159 @b{( )} A Final One.
|
|
|
160
|
|
|
161 @b{[Apply Form]} @b{[Reset Form]}
|
|
|
162 @end example
|
|
|
163
|
|
|
164 The top level widgets in is example are tagged @samp{Name},
|
|
|
165 @samp{Choose}, @samp{Address}, @samp{_other work_}, @samp{Numbers},
|
|
|
166 @samp{Select multiple}, @samp{Select one}, @samp{[Apply Form]}, and
|
|
|
167 @samp{[Reset Form]}. There are basically two thing the user can do within
|
|
|
168 a form, namely editing the editable text fields and activating the
|
|
|
169 buttons.
|
|
|
170
|
|
|
171 @subsection Editable Text Fields
|
|
|
172
|
|
|
173 In the example, the value for the @samp{Name} is most likely displayed
|
|
|
174 in an editable text field, and so are values for each of the members of
|
|
|
175 the @samp{Numbers} list. All the normal Emacs editing operations are
|
|
|
176 available for editing these fields. The only restriction is that each
|
|
|
177 change you make must be contained within a single editable text field.
|
|
|
178 For example, capitalizing all text from the middle of one field to the
|
|
|
179 middle of another field is prohibited.
|
|
|
180
|
|
|
181 Editing text fields are created by the @code{editable-field} widget.
|
|
|
182
|
|
|
183 The editing text fields are highlighted with the
|
|
|
184 @code{widget-field-face} face, making them easy to find.
|
|
|
185
|
|
|
186 @deffn Face widget-field-face
|
|
|
187 Face used for other editing fields.
|
|
|
188 @end deffn
|
|
|
189
|
|
|
190 @subsection Buttons
|
|
|
191
|
|
|
192 Some portions of the buffer have an associated @dfn{action}, which can
|
|
|
193 be @dfn{activated} by a standard key or mouse command. These portions
|
|
|
194 are called @dfn{buttons}. The default commands for activating a button
|
|
|
195 are:
|
|
|
196
|
|
|
197 @table @kbd
|
|
|
198 @item @key{RET}
|
|
|
199 @deffn Command widget-button-press @var{pos} &optional @var{event}
|
|
|
200 Activate the button at @var{pos}, defaulting to point.
|
|
|
201 If point is not located on a button, activate the binding in
|
|
|
202 @code{widget-global-map} (by default the global map).
|
|
|
203 @end deffn
|
|
|
204
|
|
|
205 @item mouse-2
|
|
|
206 @deffn Command widget-button-click @var{event}
|
|
|
207 Activate the button at the location of the mouse pointer. If the mouse
|
|
|
208 pointer is located in an editable text field, activate the binding in
|
|
|
209 @code{widget-global-map} (by default the global map).
|
|
|
210 @end deffn
|
|
|
211 @end table
|
|
|
212
|
|
|
213 There are several different kind of buttons, all of which are present in
|
|
|
214 the example:
|
|
|
215
|
|
|
216 @table @emph
|
|
|
217 @item The Option Field Tags.
|
|
|
218 When you activate one of these buttons, you will be asked to choose
|
|
|
219 between a number of different options. This is how you edit an option
|
|
|
220 field. Option fields are created by the @code{menu-choice} widget. In
|
|
|
221 the example, @samp{@b{Choose}} is an option field tag.
|
|
|
222 @item The @samp{@b{[INS]}} and @samp{@b{[DEL]}} buttons.
|
|
|
223 Activating these will insert or delete elements from a editable list.
|
|
|
224 The list is created by the @code{editable-list} widget.
|
|
|
225 @item Embedded Buttons.
|
|
|
226 The @samp{@b{_other work_}} is an example of an embedded
|
|
|
227 button. Embedded buttons are not associated with a fields, but can serve
|
|
|
228 any purpose, such as implementing hypertext references. They are
|
|
|
229 usually created by the @code{link} widget.
|
|
|
230 @item The @samp{@b{[ ]}} and @samp{@b{[X]}} buttons.
|
|
|
231 Activating one of these will convert it to the other. This is useful
|
|
|
232 for implementing multiple-choice fields. You can create it wit
|
|
|
233 @item The @samp{@b{( )}} and @samp{@b{(*)}} buttons.
|
|
|
234 Only one radio button in a @code{radio-button-choice} widget can be selected at any
|
|
|
235 time. When you push one of the unselected radio buttons, it will be
|
|
|
236 selected and the previous selected radio button will become unselected.
|
|
|
237 @item The @samp{@b{[Apply Form]}} @samp{@b{[Reset Form]}} buttons.
|
|
|
238 These are explicit buttons made with the @code{push-button} widget. The main
|
|
|
239 difference from the @code{link} widget is that the buttons are will be
|
|
|
240 displayed as GUI buttons when possible.
|
|
|
241 enough.
|
|
|
242 @end table
|
|
|
243
|
|
|
244 To make them easier to locate, buttons are emphasized in the buffer.
|
|
|
245
|
|
|
246 @deffn Face widget-button-face
|
|
|
247 Face used for buttons.
|
|
|
248 @end deffn
|
|
|
249
|
|
|
250 @defopt widget-mouse-face
|
|
|
251 Face used for buttons when the mouse pointer is above it.
|
|
|
252 @end defopt
|
|
|
253
|
|
|
254 @subsection Navigation
|
|
|
255
|
|
|
256 You can use all the normal Emacs commands to move around in a form
|
|
|
257 buffer, plus you will have these additional commands:
|
|
|
258
|
|
|
259 @table @kbd
|
|
|
260 @item @key{TAB}
|
|
|
261 @deffn Command widget-forward &optional count
|
|
|
262 Move point @var{count} buttons or editing fields forward.
|
|
|
263 @end deffn
|
|
|
264 @item @key{M-TAB}
|
|
|
265 @deffn Command widget-backward &optional count
|
|
|
266 Move point @var{count} buttons or editing fields backward.
|
|
|
267 @end deffn
|
|
|
268 @end table
|
|
|
269
|
|
|
270 @node Programming Example, Setting Up the Buffer, User Interface, Top
|
|
|
271 @comment node-name, next, previous, up
|
|
|
272 @section Programming Example
|
|
|
273
|
|
|
274 Here is the code to implement the user interface example (see @ref{User
|
|
|
275 Interface}).
|
|
|
276
|
|
|
277 @lisp
|
|
|
278 (require 'widget)
|
|
|
279
|
|
|
280 (eval-when-compile
|
|
106
|
281 (require 'wid-edit))
|
|
98
|
282
|
|
|
283 (defvar widget-example-repeat)
|
|
|
284
|
|
|
285 (defun widget-example ()
|
|
|
286 "Create the widgets from the Widget manual."
|
|
|
287 (interactive)
|
|
|
288 (switch-to-buffer "*Widget Example*")
|
|
|
289 (kill-all-local-variables)
|
|
|
290 (make-local-variable 'widget-example-repeat)
|
|
|
291 (let ((inhibit-read-only t))
|
|
|
292 (erase-buffer))
|
|
|
293 (widget-insert "Here is some documentation.\n\nName: ")
|
|
|
294 (widget-create 'editable-field
|
|
|
295 :size 13
|
|
|
296 "My Name")
|
|
|
297 (widget-create 'menu-choice
|
|
|
298 :tag "Choose"
|
|
|
299 :value "This"
|
|
|
300 :help-echo "Choose me, please!"
|
|
|
301 :notify (lambda (widget &rest ignore)
|
|
|
302 (message "%s is a good choice!"
|
|
|
303 (widget-value widget)))
|
|
|
304 '(item :tag "This option" :value "This")
|
|
|
305 '(choice-item "That option")
|
|
|
306 '(editable-field :menu-tag "No option" "Thus option"))
|
|
|
307 (widget-insert "Address: ")
|
|
|
308 (widget-create 'editable-field
|
|
|
309 "Some Place\nIn some City\nSome country.")
|
|
|
310 (widget-insert "\nSee also ")
|
|
|
311 (widget-create 'link
|
|
|
312 :notify (lambda (&rest ignore)
|
|
|
313 (widget-value-set widget-example-repeat
|
|
|
314 '("En" "To" "Tre"))
|
|
|
315 (widget-setup))
|
|
|
316 "other work")
|
|
|
317 (widget-insert " for more information.\n\nNumbers: count to three below\n")
|
|
|
318 (setq widget-example-repeat
|
|
|
319 (widget-create 'editable-list
|
|
|
320 :entry-format "%i %d %v"
|
|
|
321 :notify (lambda (widget &rest ignore)
|
|
|
322 (let ((old (widget-get widget
|
|
|
323 ':example-length))
|
|
|
324 (new (length (widget-value widget))))
|
|
|
325 (unless (eq old new)
|
|
|
326 (widget-put widget ':example-length new)
|
|
|
327 (message "You can count to %d." new))))
|
|
|
328 :value '("One" "Eh, two?" "Five!")
|
|
|
329 '(editable-field :value "three")))
|
|
|
330 (widget-insert "\n\nSelect multiple:\n\n")
|
|
|
331 (widget-create 'checkbox t)
|
|
|
332 (widget-insert " This\n")
|
|
|
333 (widget-create 'checkbox nil)
|
|
|
334 (widget-insert " That\n")
|
|
|
335 (widget-create 'checkbox
|
|
|
336 :notify (lambda (&rest ignore) (message "Tickle"))
|
|
|
337 t)
|
|
|
338 (widget-insert " Thus\n\nSelect one:\n\n")
|
|
|
339 (widget-create 'radio-button-choice
|
|
|
340 :value "One"
|
|
|
341 :notify (lambda (widget &rest ignore)
|
|
|
342 (message "You selected %s"
|
|
|
343 (widget-value widget)))
|
|
|
344 '(item "One") '(item "Anthor One.") '(item "A Final One."))
|
|
|
345 (widget-insert "\n")
|
|
|
346 (widget-create 'push-button
|
|
|
347 :notify (lambda (&rest ignore)
|
|
|
348 (if (= (length (widget-value widget-example-repeat))
|
|
|
349 3)
|
|
|
350 (message "Congratulation!")
|
|
|
351 (error "Three was the count!")))
|
|
|
352 "Apply Form")
|
|
|
353 (widget-insert " ")
|
|
|
354 (widget-create 'push-button
|
|
|
355 :notify (lambda (&rest ignore)
|
|
|
356 (widget-example))
|
|
|
357 "Reset Form")
|
|
|
358 (widget-insert "\n")
|
|
|
359 (use-local-map widget-keymap)
|
|
|
360 (widget-setup))
|
|
|
361 @end lisp
|
|
|
362
|
|
|
363 @node Setting Up the Buffer, Basic Types, Programming Example, Top
|
|
|
364 @comment node-name, next, previous, up
|
|
|
365 @section Setting Up the Buffer
|
|
|
366
|
|
|
367 Widgets are created with @code{widget-create}, which returns a
|
|
|
368 @dfn{widget} object. This object can be queried and manipulated by
|
|
|
369 other widget functions, until it is deleted with @code{widget-delete}.
|
|
|
370 After the widgets have been created, @code{widget-setup} must be called
|
|
|
371 to enable them.
|
|
|
372
|
|
|
373 @defun widget-create type [ keyword argument ]@dots{}
|
|
|
374 Create and return a widget of type @var{type}.
|
|
|
375 The syntax for the @var{type} argument is described in @ref{Basic Types}.
|
|
|
376
|
|
|
377 The keyword arguments can be used to overwrite the keyword arguments
|
|
|
378 that are part of @var{type}.
|
|
|
379 @end defun
|
|
|
380
|
|
|
381 @defun widget-delete widget
|
|
|
382 Delete @var{widget} and remove it from the buffer.
|
|
|
383 @end defun
|
|
|
384
|
|
|
385 @defun widget-setup
|
|
|
386 Setup a buffer to support widgets.
|
|
|
387
|
|
|
388 This should be called after creating all the widgets and before allowing
|
|
|
389 the user to edit them.
|
|
|
390 @refill
|
|
|
391 @end defun
|
|
|
392
|
|
|
393 If you want to insert text outside the widgets in the form, the
|
|
|
394 recommended way to do that is with @code{widget-insert}.
|
|
|
395
|
|
|
396 @defun widget-insert
|
|
|
397 Insert the arguments, either strings or characters, at point.
|
|
|
398 The inserted text will be read only.
|
|
|
399 @end defun
|
|
|
400
|
|
|
401 There is a standard widget keymap which you might find useful.
|
|
|
402
|
|
|
403 @defvr Const widget-keymap
|
|
108
|
404 A keymap with the global keymap as its parent.@*
|
|
98
|
405 @key{TAB} and @kbd{C-@key{TAB}} are bound to @code{widget-forward} and
|
|
|
406 @code{widget-backward}, respectively. @kbd{@key{RET}} and @kbd{mouse-2}
|
|
|
407 are bound to @code{widget-button-press} and
|
|
|
408 @code{widget-button-}.@refill
|
|
|
409 @end defvr
|
|
|
410
|
|
|
411 @defvar widget-global-map
|
|
|
412 Keymap used by @code{widget-button-press} and @code{widget-button-click}
|
|
|
413 when not on a button. By default this is @code{global-map}.
|
|
|
414 @end defvar
|
|
|
415
|
|
|
416 @node Basic Types, Sexp Types, Setting Up the Buffer, Top
|
|
|
417 @comment node-name, next, previous, up
|
|
|
418 @section Basic Types
|
|
|
419
|
|
|
420 The syntax of a type specification is given below:
|
|
|
421
|
|
|
422 @example
|
|
|
423 NAME ::= (NAME [KEYWORD ARGUMENT]... ARGS)
|
|
|
424 | NAME
|
|
|
425 @end example
|
|
|
426
|
|
|
427 Where, @var{name} is a widget name, @var{keyword} is the name of a
|
|
|
428 property, @var{argument} is the value of the property, and @var{args}
|
|
|
429 are interpreted in a widget specific way.
|
|
|
430
|
|
|
431 There following keyword arguments that apply to all widgets:
|
|
|
432
|
|
|
433 @table @code
|
|
|
434 @item :value
|
|
|
435 The initial value for widgets of this type.
|
|
|
436
|
|
|
437 @item :format
|
|
|
438 This string will be inserted in the buffer when you create a widget.
|
|
|
439 The following @samp{%} escapes are available:
|
|
|
440
|
|
|
441 @table @samp
|
|
|
442 @item %[
|
|
|
443 @itemx %]
|
|
|
444 The text inside will be marked as a button.
|
|
|
445
|
|
|
446 @item %@{
|
|
|
447 @itemx %@}
|
|
|
448 The text inside will be displayed with the face specified by
|
|
|
449 @code{:sample-face}.
|
|
|
450
|
|
|
451 @item %v
|
|
|
452 This will be replaces with the buffer representation of the widgets
|
|
|
453 value. What this is depends on the widget type.
|
|
|
454
|
|
|
455 @item %d
|
|
|
456 Insert the string specified by @code{:doc} here.
|
|
|
457
|
|
|
458 @item %h
|
|
|
459 Like @samp{%d}, with the following modifications: If the documentation
|
|
|
460 string is more than one line, it will add a button which will toggle
|
|
|
461 between showing only the first line, and showing the full text.
|
|
|
462 Furthermore, if there is no @code{:doc} property in the widget, it will
|
|
|
463 instead examine the @code{:documentation-property} property. If it is a
|
|
|
464 lambda expression, it will be called with the widget's value as an
|
|
|
465 argument, and the result will be used as the documentation text.
|
|
|
466
|
|
|
467 @item %t
|
|
|
468 Insert the string specified by @code{:tag} here, or the @code{princ}
|
|
|
469 representation of the value if there is no tag.
|
|
|
470
|
|
|
471 @item %%
|
|
|
472 Insert a literal @samp{%}.
|
|
|
473 @end table
|
|
|
474
|
|
|
475 @item :button-face
|
|
|
476 Face used to highlight text inside %[ %] in the format.
|
|
|
477
|
|
|
478 @item :doc
|
|
|
479 The string inserted by the @samp{%d} escape in the format
|
|
|
480 string.
|
|
|
481
|
|
|
482 @item :tag
|
|
|
483 The string inserted by the @samp{%t} escape in the format
|
|
|
484 string.
|
|
|
485
|
|
|
486 @item :tag-glyph
|
|
|
487 Name of image to use instead of the string specified by `:tag' on
|
|
|
488 Emacsen that supports it.
|
|
|
489
|
|
|
490 @item :help-echo
|
|
|
491 Message displayed whenever you move to the widget with either
|
|
|
492 @code{widget-forward} or @code{widget-backward}.
|
|
|
493
|
|
|
494 @item :indent
|
|
|
495 An integer indicating the absolute number of spaces to indent children
|
|
|
496 of this widget.
|
|
|
497
|
|
|
498 @item :offset
|
|
|
499 An integer indicating how many extra spaces to add to the widget's
|
|
|
500 grandchildren compared to this widget.
|
|
|
501
|
|
|
502 @item :extra-offset
|
|
|
503 An integer indicating how many extra spaces to add to the widget's
|
|
|
504 children compared to this widget.
|
|
|
505
|
|
|
506 @item :notify
|
|
|
507 A function called each time the widget or a nested widget is changed.
|
|
|
508 The function is called with two or three arguments. The first argument
|
|
|
509 is the widget itself, the second argument is the widget that was
|
|
|
510 changed, and the third argument is the event leading to the change, if
|
|
|
511 any.
|
|
|
512
|
|
|
513 @item :menu-tag
|
|
|
514 Tag used in the menu when the widget is used as an option in a
|
|
|
515 @code{menu-choice} widget.
|
|
|
516
|
|
|
517 @item :menu-tag-get
|
|
|
518 Function used for finding the tag when the widget is used as an option
|
|
|
519 in a @code{menu-choice} widget. By default, the tag used will be either the
|
|
|
520 @code{:menu-tag} or @code{:tag} property if present, or the @code{princ}
|
|
|
521 representation of the @code{:value} property if not.
|
|
|
522
|
|
|
523 @item :match
|
|
|
524 Should be a function called with two arguments, the widget and a value,
|
|
|
525 and returning non-nil if the widget can represent the specified value.
|
|
|
526
|
|
|
527 @item :validate
|
|
|
528 A function which takes a widget as an argument, and return nil if the
|
|
|
529 widgets current value is valid for the widget. Otherwise, it should
|
|
|
530 return the widget containing the invalid data, and set that widgets
|
|
|
531 @code{:error} property to a string explaining the error.
|
|
|
532
|
|
110
|
533 @item :tab-order
|
|
|
534 Specify the order in which widgets are traversed with
|
|
|
535 @code{widget-forward} or @code{widget-backward}. This is only partially
|
|
|
536 implemented.
|
|
|
537
|
|
|
538 @enumerate a
|
|
|
539 @item
|
|
|
540 Widgets with tabbing order @code{-1} are ignored.
|
|
|
541
|
|
|
542 @item
|
|
|
543 (Unimplemented) When on a widget with tabbing order @var{n}, go to the
|
|
|
544 next widget in the buffer with tabbing order @var{n+1} or @code{nil},
|
|
|
545 whichever comes first.
|
|
|
546
|
|
|
547 @item
|
|
|
548 When on a widget with no tabbing order specified, go to the next widget
|
|
|
549 in the buffer with a positive tabbing order, or @code{nil}
|
|
|
550 @end enumerate
|
|
|
551
|
|
98
|
552 @item :parent
|
|
110
|
553 The parent of a nested widget (e.g. a @code{menu-choice} item or an
|
|
|
554 element of a @code{editable-list} widget).
|
|
108
|
555
|
|
|
556 @item :sibling-args
|
|
|
557 This keyword is only used for members of a @code{radio-button-choice} or
|
|
|
558 @code{checklist}. The value should be a list of extra keyword
|
|
|
559 arguments, which will be used when creating the @code{radio-button} or
|
|
|
560 @code{checkbox} associated with this item.
|
|
|
561
|
|
98
|
562 @end table
|
|
|
563
|
|
|
564 @deffn {User Option} widget-glyph-directory
|
|
|
565 Directory where glyphs are found.
|
|
|
566 Widget will look here for a file with the same name as specified for the
|
|
|
567 image, with either a @samp{.xpm} (if supported) or @samp{.xbm} extension.
|
|
|
568 @end deffn
|
|
|
569
|
|
|
570 @deffn{User Option} widget-glyph-enable
|
|
|
571 If non-nil, allow glyphs to appear on displayes where they are supported.
|
|
|
572 @end deffn
|
|
|
573
|
|
|
574
|
|
|
575 @menu
|
|
|
576 * link::
|
|
|
577 * url-link::
|
|
|
578 * info-link::
|
|
|
579 * push-button::
|
|
|
580 * editable-field::
|
|
|
581 * text::
|
|
|
582 * menu-choice::
|
|
|
583 * radio-button-choice::
|
|
|
584 * item::
|
|
|
585 * choice-item::
|
|
|
586 * toggle::
|
|
|
587 * checkbox::
|
|
|
588 * checklist::
|
|
|
589 * editable-list::
|
|
|
590 @end menu
|
|
|
591
|
|
|
592 @node link, url-link, Basic Types, Basic Types
|
|
|
593 @comment node-name, next, previous, up
|
|
|
594 @subsection The @code{link} Widget
|
|
|
595
|
|
|
596 Syntax:
|
|
|
597
|
|
|
598 @example
|
|
|
599 TYPE ::= (link [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
600 @end example
|
|
|
601
|
|
|
602 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
603 property. The value should be a string, which will be inserted in the
|
|
|
604 buffer.
|
|
|
605
|
|
|
606 @node url-link, info-link, link, Basic Types
|
|
|
607 @comment node-name, next, previous, up
|
|
|
608 @subsection The @code{url-link} Widget
|
|
|
609
|
|
|
610 Syntax:
|
|
|
611
|
|
|
612 @example
|
|
|
613 TYPE ::= (url-link [KEYWORD ARGUMENT]... URL)
|
|
|
614 @end example
|
|
|
615
|
|
|
616 When this link is activated, the @sc{www} browser specified by
|
|
|
617 @code{browse-url-browser-function} will be called with @var{url}.
|
|
|
618
|
|
|
619 @node info-link, push-button, url-link, Basic Types
|
|
|
620 @comment node-name, next, previous, up
|
|
|
621 @subsection The @code{info-link} Widget
|
|
|
622
|
|
|
623 Syntax:
|
|
|
624
|
|
|
625 @example
|
|
|
626 TYPE ::= (info-link [KEYWORD ARGUMENT]... ADDRESS)
|
|
|
627 @end example
|
|
|
628
|
|
|
629 When this link is activated, the build-in info browser is started on
|
|
|
630 @var{address}.
|
|
|
631
|
|
|
632 @node push-button, editable-field, info-link, Basic Types
|
|
|
633 @comment node-name, next, previous, up
|
|
|
634 @subsection The @code{push-button} Widget
|
|
|
635
|
|
|
636 Syntax:
|
|
|
637
|
|
|
638 @example
|
|
|
639 TYPE ::= (push-button [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
640 @end example
|
|
|
641
|
|
|
642 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
643 property. The value should be a string, which will be inserted in the
|
|
|
644 buffer.
|
|
|
645
|
|
120
|
646 The following extra properties are recognized.
|
|
|
647
|
|
|
648 @table @code
|
|
|
649 @item :text-format
|
|
|
650 The format string used when the push button cannot be displayed
|
|
|
651 graphically. There are two escapes, @code{%s}, which must be present
|
|
|
652 exactly once, will be substituted with the tag, and @code{%%} will be
|
|
|
653 substituted with a singe @samp{%}.
|
|
|
654 @end table
|
|
|
655
|
|
|
656 By default the tag will be shown in brackets.
|
|
|
657
|
|
98
|
658 @node editable-field, text, push-button, Basic Types
|
|
|
659 @comment node-name, next, previous, up
|
|
|
660 @subsection The @code{editable-field} Widget
|
|
|
661
|
|
|
662 Syntax:
|
|
|
663
|
|
|
664 @example
|
|
|
665 TYPE ::= (editable-field [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
666 @end example
|
|
|
667
|
|
|
668 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
669 property. The value should be a string, which will be inserted in
|
|
|
670 field. This widget will match all string values.
|
|
|
671
|
|
|
672 The following extra properties are recognized.
|
|
|
673
|
|
|
674 @table @code
|
|
|
675 @item :size
|
|
108
|
676 The width of the editable field.@*
|
|
98
|
677 By default the field will reach to the end of the line.
|
|
|
678
|
|
|
679 @item :value-face
|
|
|
680 Face used for highlighting the editable field. Default is
|
|
|
681 @code{widget-field-face}.
|
|
|
682
|
|
|
683 @item :secret
|
|
|
684 Character used to display the value. You can set this to e.g. @code{?*}
|
|
|
685 if the field contains a password or other secret information. By
|
|
|
686 default, the value is not secret.
|
|
|
687
|
|
|
688 @item :valid-regexp
|
|
|
689 By default the @code{:validate} function will match the content of the
|
|
|
690 field with the value of this attribute. The default value is @code{""}
|
|
|
691 which matches everything.
|
|
|
692
|
|
|
693 @item :keymap
|
|
|
694 Keymap used in the editable field. The default value is
|
|
|
695 @code{widget-field-keymap}, which allows you to use all the normal
|
|
|
696 editing commands, even if the buffers major mode supress some of them.
|
|
|
697 Pressing return activates the function specified by @code{:activate}.
|
|
|
698
|
|
|
699 @item :hide-front-space
|
|
|
700 @itemx :hide-rear-space
|
|
|
701 In order to keep track of the editable field, emacs places an invisible
|
|
|
702 space character in front of the field, and for fixed sized fields also
|
|
|
703 in the rear end of the field. For fields that extent to the end of the
|
|
|
704 line, the terminating linefeed serves that purpose instead.
|
|
|
705
|
|
|
706 Emacs will try to make the spaces intangible when it is safe to do so.
|
|
|
707 Intangible means that the cursor motion commands will skip over the
|
|
|
708 character as if it didn't exist. This is safe to do when the text
|
|
|
709 preceding or following the widget cannot possible change during the
|
|
|
710 lifetime of the @code{editable-field} widget. The preferred way to tell
|
|
|
711 Emacs this, is to add text to the @code{:format} property around the
|
|
|
712 value. For example @code{:format "Tag: %v "}.
|
|
|
713
|
|
|
714 You can overwrite the internal safety check by setting the
|
|
|
715 @code{:hide-front-space} or @code{:hide-rear-space} properties to
|
|
|
716 non-nil. This is not recommended. For example, @emph{all} text that
|
|
|
717 belongs to a widget (i.e. is created from its @code{:format} string) will
|
|
|
718 change whenever the widget changes its value.
|
|
|
719
|
|
|
720 @end table
|
|
|
721
|
|
|
722 @node text, menu-choice, editable-field, Basic Types
|
|
|
723 @comment node-name, next, previous, up
|
|
|
724 @subsection The @code{text} Widget
|
|
|
725
|
|
|
726 This is just like @code{editable-field}, but intended for multiline text
|
|
|
727 fields. The default @code{:keymap} is @code{widget-text-keymap}, which
|
|
|
728 does not rebind the return key.
|
|
|
729
|
|
|
730 @node menu-choice, radio-button-choice, text, Basic Types
|
|
|
731 @comment node-name, next, previous, up
|
|
|
732 @subsection The @code{menu-choice} Widget
|
|
|
733
|
|
|
734 Syntax:
|
|
|
735
|
|
|
736 @example
|
|
|
737 TYPE ::= (menu-choice [KEYWORD ARGUMENT]... TYPE ... )
|
|
|
738 @end example
|
|
|
739
|
|
|
740 The @var{type} arguments represents each possible choice. The widgets
|
|
|
741 value of will be the value of the chosen @var{type} argument. This
|
|
|
742 widget will match any value that matches at least one of the specified
|
|
|
743 @var{type} arguments.
|
|
|
744
|
|
|
745 @table @code
|
|
|
746 @item :void
|
|
|
747 Widget type used as a fallback when the value does not match any of the
|
|
|
748 specified @var{type} arguments.
|
|
|
749
|
|
|
750 @item :case-fold
|
|
|
751 Set this to nil if you don't want to ignore case when prompting for a
|
|
|
752 choice through the minibuffer.
|
|
|
753
|
|
|
754 @item :children
|
|
|
755 A list whose car is the widget representing the currently chosen type in
|
|
|
756 the buffer.
|
|
|
757
|
|
|
758 @item :choice
|
|
|
759 The current chosen type
|
|
|
760
|
|
|
761 @item :args
|
|
|
762 The list of types.
|
|
|
763 @end table
|
|
|
764
|
|
|
765 @node radio-button-choice, item, menu-choice, Basic Types
|
|
|
766 @comment node-name, next, previous, up
|
|
|
767 @subsection The @code{radio-button-choice} Widget
|
|
|
768
|
|
|
769 Syntax:
|
|
|
770
|
|
|
771 @example
|
|
|
772 TYPE ::= (radio-button-choice [KEYWORD ARGUMENT]... TYPE ... )
|
|
|
773 @end example
|
|
|
774
|
|
|
775 The @var{type} arguments represents each possible choice. The widgets
|
|
|
776 value of will be the value of the chosen @var{type} argument. This
|
|
|
777 widget will match any value that matches at least one of the specified
|
|
|
778 @var{type} arguments.
|
|
|
779
|
|
|
780 The following extra properties are recognized.
|
|
|
781
|
|
|
782 @table @code
|
|
|
783 @item :entry-format
|
|
|
784 This string will be inserted for each entry in the list.
|
|
|
785 The following @samp{%} escapes are available:
|
|
|
786 @table @samp
|
|
|
787 @item %v
|
|
|
788 Replaced with the buffer representation of the @var{type} widget.
|
|
|
789 @item %b
|
|
|
790 Replace with the radio button.
|
|
|
791 @item %%
|
|
|
792 Insert a literal @samp{%}.
|
|
|
793 @end table
|
|
|
794
|
|
108
|
795 @item button-args
|
|
|
796 A list of keywords to pass to the radio buttons. Useful for setting
|
|
|
797 e.g. the @samp{:help-echo} for each button.
|
|
|
798
|
|
98
|
799 @item :buttons
|
|
|
800 The widgets representing the radio buttons.
|
|
|
801
|
|
|
802 @item :children
|
|
|
803 The widgets representing each type.
|
|
|
804
|
|
|
805 @item :choice
|
|
|
806 The current chosen type
|
|
|
807
|
|
|
808 @item :args
|
|
|
809 The list of types.
|
|
|
810 @end table
|
|
|
811
|
|
|
812 You can add extra radio button items to a @code{radio-button-choice}
|
|
|
813 widget after it has been created with the function
|
|
|
814 @code{widget-radio-add-item}.
|
|
|
815
|
|
|
816 @defun widget-radio-add-item widget type
|
|
|
817 Add to @code{radio-button-choice} widget @var{widget} a new radio button item of type
|
|
|
818 @var{type}.
|
|
|
819 @end defun
|
|
|
820
|
|
|
821 Please note that such items added after the @code{radio-button-choice}
|
|
|
822 widget has been created will @strong{not} be properly destructed when
|
|
|
823 you call @code{widget-delete}.
|
|
|
824
|
|
|
825 @node item, choice-item, radio-button-choice, Basic Types
|
|
|
826 @comment node-name, next, previous, up
|
|
|
827 @subsection The @code{item} Widget
|
|
|
828
|
|
|
829 Syntax:
|
|
|
830
|
|
|
831 @example
|
|
|
832 ITEM ::= (item [KEYWORD ARGUMENT]... VALUE)
|
|
|
833 @end example
|
|
|
834
|
|
|
835 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
836 property. The value should be a string, which will be inserted in the
|
|
|
837 buffer. This widget will only match the specified value.
|
|
|
838
|
|
|
839 @node choice-item, toggle, item, Basic Types
|
|
|
840 @comment node-name, next, previous, up
|
|
|
841 @subsection The @code{choice-item} Widget
|
|
|
842
|
|
|
843 Syntax:
|
|
|
844
|
|
|
845 @example
|
|
|
846 ITEM ::= (choice-item [KEYWORD ARGUMENT]... VALUE)
|
|
|
847 @end example
|
|
|
848
|
|
|
849 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
850 property. The value should be a string, which will be inserted in the
|
|
|
851 buffer as a button. Activating the button of a @code{choice-item} is
|
|
|
852 equivalent to activating the parent widget. This widget will only match
|
|
|
853 the specified value.
|
|
|
854
|
|
|
855 @node toggle, checkbox, choice-item, Basic Types
|
|
|
856 @comment node-name, next, previous, up
|
|
|
857 @subsection The @code{toggle} Widget
|
|
|
858
|
|
|
859 Syntax:
|
|
|
860
|
|
|
861 @example
|
|
|
862 TYPE ::= (toggle [KEYWORD ARGUMENT]...)
|
|
|
863 @end example
|
|
|
864
|
|
|
865 The widget has two possible states, `on' and `off', which corresponds to
|
|
|
866 a @code{t} or @code{nil} value.
|
|
|
867
|
|
|
868 The following extra properties are recognized.
|
|
|
869
|
|
|
870 @table @code
|
|
|
871 @item :on
|
|
|
872 String representing the `on' state. By default the string @samp{on}.
|
|
|
873 @item :off
|
|
|
874 String representing the `off' state. By default the string @samp{off}.
|
|
|
875 @item :on-glyph
|
|
|
876 Name of a glyph to be used instead of the `:on' text string, on emacsen
|
|
|
877 that supports it.
|
|
|
878 @item :off-glyph
|
|
|
879 Name of a glyph to be used instead of the `:off' text string, on emacsen
|
|
|
880 that supports it.
|
|
|
881 @end table
|
|
|
882
|
|
|
883 @node checkbox, checklist, toggle, Basic Types
|
|
|
884 @comment node-name, next, previous, up
|
|
|
885 @subsection The @code{checkbox} Widget
|
|
|
886
|
|
|
887 The widget has two possible states, `selected' and `unselected', which
|
|
|
888 corresponds to a @code{t} or @code{nil} value.
|
|
|
889
|
|
|
890 Syntax:
|
|
|
891
|
|
|
892 @example
|
|
|
893 TYPE ::= (checkbox [KEYWORD ARGUMENT]...)
|
|
|
894 @end example
|
|
|
895
|
|
|
896 @node checklist, editable-list, checkbox, Basic Types
|
|
|
897 @comment node-name, next, previous, up
|
|
|
898 @subsection The @code{checklist} Widget
|
|
|
899
|
|
|
900 Syntax:
|
|
|
901
|
|
|
902 @example
|
|
|
903 TYPE ::= (checklist [KEYWORD ARGUMENT]... TYPE ... )
|
|
|
904 @end example
|
|
|
905
|
|
|
906 The @var{type} arguments represents each checklist item. The widgets
|
|
|
907 value of will be a list containing the value of each ticked @var{type}
|
|
|
908 argument. The checklist widget will match a list whose elements all
|
|
|
909 matches at least one of the specified @var{type} arguments.
|
|
|
910
|
|
|
911 The following extra properties are recognized.
|
|
|
912
|
|
|
913 @table @code
|
|
|
914 @item :entry-format
|
|
|
915 This string will be inserted for each entry in the list.
|
|
|
916 The following @samp{%} escapes are available:
|
|
|
917 @table @samp
|
|
|
918 @item %v
|
|
|
919 Replaced with the buffer representation of the @var{type} widget.
|
|
|
920 @item %b
|
|
|
921 Replace with the checkbox.
|
|
|
922 @item %%
|
|
|
923 Insert a literal @samp{%}.
|
|
|
924 @end table
|
|
|
925
|
|
108
|
926 @item button-args
|
|
|
927 A list of keywords to pass to the checkboxes. Useful for setting
|
|
|
928 e.g. the @samp{:help-echo} for each checkbox.
|
|
|
929
|
|
98
|
930 @item :buttons
|
|
|
931 The widgets representing the checkboxes.
|
|
|
932
|
|
|
933 @item :children
|
|
|
934 The widgets representing each type.
|
|
|
935
|
|
|
936 @item :args
|
|
|
937 The list of types.
|
|
|
938 @end table
|
|
|
939
|
|
|
940 @node editable-list, , checklist, Basic Types
|
|
|
941 @comment node-name, next, previous, up
|
|
|
942 @subsection The @code{editable-list} Widget
|
|
|
943
|
|
|
944 Syntax:
|
|
|
945
|
|
|
946 @example
|
|
|
947 TYPE ::= (editable-list [KEYWORD ARGUMENT]... TYPE)
|
|
|
948 @end example
|
|
|
949
|
|
|
950 The value is a list, where each member represent one widget of type
|
|
|
951 @var{type}.
|
|
|
952
|
|
|
953 The following extra properties are recognized.
|
|
|
954
|
|
|
955 @table @code
|
|
|
956 @item :entry-format
|
|
|
957 This string will be inserted for each entry in the list.
|
|
|
958 The following @samp{%} escapes are available:
|
|
|
959 @table @samp
|
|
|
960 @item %v
|
|
|
961 This will be replaced with the buffer representation of the @var{type}
|
|
|
962 widget.
|
|
|
963 @item %i
|
|
|
964 Insert the @b{[INS]} button.
|
|
|
965 @item %d
|
|
|
966 Insert the @b{[DEL]} button.
|
|
|
967 @item %%
|
|
|
968 Insert a literal @samp{%}.
|
|
|
969 @end table
|
|
|
970
|
|
108
|
971 @item :insert-button-args
|
|
|
972 A list of keyword arguments to pass to the insert buttons.
|
|
|
973
|
|
|
974 @item :delete-button-args
|
|
|
975 A list of keyword arguments to pass to the delete buttons.
|
|
|
976
|
|
|
977 @item :append-button-args
|
|
|
978 A list of keyword arguments to pass to the trailing insert button.
|
|
|
979
|
|
|
980
|
|
98
|
981 @item :buttons
|
|
|
982 The widgets representing the insert and delete buttons.
|
|
|
983
|
|
|
984 @item :children
|
|
|
985 The widgets representing the elements of the list.
|
|
|
986
|
|
|
987 @item :args
|
|
|
988 List whose car is the type of the list elements.
|
|
|
989
|
|
|
990 @end table
|
|
|
991
|
|
|
992 @node Sexp Types, Widget Properties, Basic Types, Top
|
|
|
993 @comment
|
|
|
994 @section Sexp Types
|
|
|
995
|
|
|
996 A number of widgets for editing s-expressions (lisp types) are also
|
|
|
997 available. These basically fall in three categories: @dfn{atoms},
|
|
|
998 @dfn{composite types}, and @dfn{generic}.
|
|
|
999
|
|
|
1000 @menu
|
|
|
1001 * generic::
|
|
|
1002 * atoms::
|
|
|
1003 * composite::
|
|
|
1004 @end menu
|
|
|
1005
|
|
|
1006 @node generic, atoms, Sexp Types, Sexp Types
|
|
|
1007 @comment node-name, next, previous, up
|
|
|
1008 @subsection The Generic Widget.
|
|
|
1009
|
|
|
1010 The @code{const} and @code{sexp} widgets can contain any lisp
|
|
|
1011 expression. In the case of the @code{const} widget the user is
|
|
|
1012 prohibited from editing edit it, which is mainly useful as a component
|
|
|
1013 of one of the composite widgets.
|
|
|
1014
|
|
|
1015 The syntax for the generic widgets is
|
|
|
1016
|
|
|
1017 @example
|
|
|
1018 TYPE ::= (const [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
1019 @end example
|
|
|
1020
|
|
|
1021 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
1022 property and can be any s-expression.
|
|
|
1023
|
|
|
1024 @deffn Widget const
|
|
|
1025 This will display any valid s-expression in an immutable part of the
|
|
|
1026 buffer.
|
|
|
1027 @end deffn
|
|
|
1028
|
|
|
1029 @deffn Widget sexp
|
|
|
1030 This will allow you to edit any valid s-expression in an editable buffer
|
|
|
1031 field.
|
|
|
1032
|
|
|
1033 The @code{sexp} widget takes the same keyword arguments as the
|
|
|
1034 @code{editable-field} widget.
|
|
|
1035 @end deffn
|
|
|
1036
|
|
|
1037 @node atoms, composite, generic, Sexp Types
|
|
|
1038 @comment node-name, next, previous, up
|
|
|
1039 @subsection Atomic Sexp Widgets.
|
|
|
1040
|
|
|
1041 The atoms are s-expressions that does not consist of other
|
|
|
1042 s-expressions. A string is an atom, while a list is a composite type.
|
|
|
1043 You can edit the value of an atom with the following widgets.
|
|
|
1044
|
|
|
1045 The syntax for all the atoms are
|
|
|
1046
|
|
|
1047 @example
|
|
|
1048 TYPE ::= (NAME [KEYWORD ARGUMENT]... [ VALUE ])
|
|
|
1049 @end example
|
|
|
1050
|
|
|
1051 The @var{value}, if present, is used to initialize the @code{:value}
|
|
|
1052 property and must be an expression of the same type as the widget.
|
|
|
1053 I.e. the string widget can only be initialized with a string.
|
|
|
1054
|
|
|
1055 All the atom widgets take the same keyword arguments as the @code{editable-field}
|
|
|
1056 widget.
|
|
|
1057
|
|
|
1058 @deffn Widget string
|
|
|
1059 Allows you to edit a string in an editable field.
|
|
|
1060 @end deffn
|
|
|
1061
|
|
|
1062 @deffn Widget file
|
|
|
1063 Allows you to edit a file name in an editable field. You you activate
|
|
|
1064 the tag button, you can edit the file name in the mini-buffer with
|
|
|
1065 completion.
|
|
|
1066
|
|
|
1067 Keywords:
|
|
|
1068 @table @code
|
|
|
1069 @item :must-match
|
|
|
1070 If this is set to non-nil, only existing file names will be allowed in
|
|
|
1071 the minibuffer.
|
|
|
1072 @end table
|
|
|
1073 @end deffn
|
|
|
1074
|
|
|
1075 @deffn Widget directory
|
|
|
1076 Allows you to edit a directory name in an editable field.
|
|
|
1077 Similar to the @code{file} widget.
|
|
|
1078 @end deffn
|
|
|
1079
|
|
|
1080 @deffn Widget symbol
|
|
|
1081 Allows you to edit a lisp symbol in an editable field.
|
|
|
1082 @end deffn
|
|
|
1083
|
|
|
1084 @deffn Widget integer
|
|
|
1085 Allows you to edit an integer in an editable field.
|
|
|
1086 @end deffn
|
|
|
1087
|
|
|
1088 @deffn Widget number
|
|
|
1089 Allows you to edit a number in an editable field.
|
|
|
1090 @end deffn
|
|
|
1091
|
|
|
1092 @deffn Widget boolean
|
|
|
1093 Allows you to edit a boolean. In lisp this means a variable which is
|
|
|
1094 either nil meaning false, or non-nil meaning true.
|
|
|
1095 @end deffn
|
|
|
1096
|
|
|
1097
|
|
|
1098 @node composite, , atoms, Sexp Types
|
|
|
1099 @comment node-name, next, previous, up
|
|
|
1100 @subsection Composite Sexp Widgets.
|
|
|
1101
|
|
|
1102 The syntax for the composite are
|
|
|
1103
|
|
|
1104 @example
|
|
|
1105 TYPE ::= (NAME [KEYWORD ARGUMENT]... COMPONENT...)
|
|
|
1106 @end example
|
|
|
1107
|
|
|
1108 Where each @var{component} must be a widget type. Each component widget
|
|
|
1109 will be displayed in the buffer, and be editable to the user.
|
|
|
1110
|
|
|
1111 @deffn Widget cons
|
|
|
1112 The value of a @code{cons} widget is a cons-cell where the car is the
|
|
|
1113 value of the first component and the cdr is the value of the second
|
|
|
1114 component. There must be exactly two components.
|
|
|
1115 @end deffn
|
|
|
1116
|
|
|
1117 @deffn Widget lisp
|
|
|
1118 The value of a @code{lisp} widget is a list containing the value of
|
|
|
1119 each of its component.
|
|
|
1120 @end deffn
|
|
|
1121
|
|
|
1122 @deffn Widget vector
|
|
|
1123 The value of a @code{vector} widget is a vector containing the value of
|
|
|
1124 each of its component.
|
|
|
1125 @end deffn
|
|
|
1126
|
|
|
1127 The above suffice for specifying fixed size lists and vectors. To get
|
|
|
1128 variable length lists and vectors, you can use a @code{choice},
|
|
|
1129 @code{set} or @code{repeat} widgets together with the @code{:inline}
|
|
|
1130 keywords. If any component of a composite widget has the @code{:inline}
|
|
|
1131 keyword set, its value must be a list which will then be spliced into
|
|
|
1132 the composite. For example, to specify a list whose first element must
|
|
|
1133 be a file name, and whose remaining arguments should either by the
|
|
|
1134 symbol @code{t} or two files, you can use the following widget
|
|
|
1135 specification:
|
|
|
1136
|
|
|
1137 @example
|
|
|
1138 (list file
|
|
|
1139 (choice (const t)
|
|
|
1140 (list :inline t
|
|
|
1141 :value ("foo" "bar")
|
|
|
1142 string string)))
|
|
|
1143 @end example
|
|
|
1144
|
|
|
1145 The value of a widget of this type will either have the form
|
|
|
1146 @samp{(file t)} or @code{(file string string)}.
|
|
|
1147
|
|
|
1148 This concept of inline is probably hard to understand. It was certainly
|
|
|
1149 hard to implement so instead of confuse you more by trying to explain it
|
|
|
1150 here, I'll just suggest you meditate over it for a while.
|
|
|
1151
|
|
|
1152 @deffn Widget choice
|
|
|
1153 Allows you to edit a sexp which may have one of fixed set of types. It
|
|
|
1154 is currently implemented with the @code{choice-menu} basic widget, and
|
|
|
1155 has a similar syntax.
|
|
|
1156 @end deffn
|
|
|
1157
|
|
|
1158 @deffn Widget set
|
|
|
1159 Allows you to specify a type which must be a list whose elements all
|
|
|
1160 belong to given set. The elements of the list is not significant. This
|
|
|
1161 is implemented on top of the @code{checklist} basic widget, and has a
|
|
|
1162 similar syntax.
|
|
|
1163 @end deffn
|
|
|
1164
|
|
|
1165 @deffn Widget repeat
|
|
|
1166 Allows you to specify a variable length list whose members are all of
|
|
|
1167 the same type. Implemented on top of the `editable-list' basic widget,
|
|
|
1168 and has a similar syntax.
|
|
|
1169 @end deffn
|
|
|
1170
|
|
|
1171 @node Widget Properties, Defining New Widgets, Sexp Types, Top
|
|
|
1172 @comment node-name, next, previous, up
|
|
|
1173 @section Properties
|
|
|
1174
|
|
|
1175 You can examine or set the value of a widget by using the widget object
|
|
|
1176 that was returned by @code{widget-create}.
|
|
|
1177
|
|
|
1178 @defun widget-value widget
|
|
|
1179 Return the current value contained in @var{widget}.
|
|
|
1180 It is an error to call this function on an uninitialized widget.
|
|
|
1181 @end defun
|
|
|
1182
|
|
|
1183 @defun widget-value-set widget value
|
|
|
1184 Set the value contained in @var{widget} to @var{value}.
|
|
|
1185 It is an error to call this function with an invalid @var{value}.
|
|
|
1186 @end defun
|
|
|
1187
|
|
|
1188 @strong{Important:} You @emph{must} call @code{widget-setup} after
|
|
|
1189 modifying the value of a widget before the user is allowed to edit the
|
|
|
1190 widget again. It is enough to call @code{widget-setup} once if you
|
|
|
1191 modify multiple widgets. This is currently only necessary if the widget
|
|
|
1192 contains an editing field, but may be necessary for other widgets in the
|
|
|
1193 future.
|
|
|
1194
|
|
|
1195 If your application needs to associate some information with the widget
|
|
|
1196 objects, for example a reference to the item being edited, it can be
|
|
|
1197 done with @code{widget-put} and @code{widget-get}. The property names
|
|
|
1198 must begin with a @samp{:}.
|
|
|
1199
|
|
|
1200 @defun widget-put widget property value
|
|
|
1201 In @var{widget} set @var{property} to @var{value}.
|
|
|
1202 @var{property} should be a symbol, while @var{value} can be anything.
|
|
|
1203 @end defun
|
|
|
1204
|
|
|
1205 @defun widget-get widget property
|
|
|
1206 In @var{widget} return the value for @var{property}.
|
|
|
1207 @var{property} should be a symbol, the value is what was last set by
|
|
|
1208 @code{widget-put} for @var{property}.
|
|
|
1209 @end defun
|
|
|
1210
|
|
|
1211 @defun widget-member widget property
|
|
|
1212 Non-nil if @var{widget} has a value (even nil) for property @var{property}.
|
|
|
1213 @end defun
|
|
|
1214
|
|
|
1215 Occasionally it can be useful to know which kind of widget you have,
|
|
|
1216 i.e. the name of the widget type you gave when the widget was created.
|
|
|
1217
|
|
|
1218 @defun widget-type widget
|
|
|
1219 Return the name of @var{widget}, a symbol.
|
|
|
1220 @end defun
|
|
|
1221
|
|
116
|
1222 Widgets can be in two states: active, which means they are modifiable by
|
|
|
1223 the user, or inactive, which means they cannot be modified by the user.
|
|
|
1224 You can query or set the state with the following code:
|
|
|
1225
|
|
|
1226 @lisp
|
|
|
1227 ;; Examine if @var{widget} is active or not.
|
|
|
1228 (if (widget-apply @var{widget} :active)
|
|
|
1229 (message "Widget is active.")
|
|
|
1230 (message "Widget is inactive.")
|
|
|
1231
|
|
|
1232 ;; Make @var{widget} inactive.
|
|
|
1233 (widget-apply @var{widget} :deactivate)
|
|
|
1234
|
|
|
1235 ;; Make @var{widget} active.
|
|
|
1236 (widget-apply @var{widget} :activate)
|
|
|
1237 @end lisp
|
|
|
1238
|
|
|
1239 A widget is inactive if itself, or any of its ancestors (found by
|
|
|
1240 following the @code{:parent} link) have been deactivated. To make sure
|
|
|
1241 a widget is really active, you must therefore activate both itself, and
|
|
|
1242 all its ancestors.
|
|
|
1243
|
|
|
1244 @lisp
|
|
|
1245 (while widget
|
|
|
1246 (widget-apply widget :activate)
|
|
|
1247 (setq widget (widget-get widget :parent)))
|
|
|
1248 @end lisp
|
|
|
1249
|
|
|
1250 You can check if a widget has been made inactive by examining the value
|
|
|
1251 of @code{:inactive} keyword. If this is non-nil, the widget itself has
|
|
|
1252 been deactivated. This is different from using the @code{:active}
|
|
|
1253 keyword, in that the later tell you if the widget @strong{or} any of its
|
|
|
1254 ancestors have been deactivated. Do not attempt to set the
|
|
|
1255 @code{:inactive} keyword directly. Use the @code{:activate}
|
|
|
1256 @code{:deactivated} keywords instead.
|
|
|
1257
|
|
|
1258
|
|
98
|
1259 @node Defining New Widgets, Widget Wishlist., Widget Properties, Top
|
|
|
1260 @comment node-name, next, previous, up
|
|
|
1261 @section Defining New Widgets
|
|
|
1262
|
|
|
1263 You can define specialized widgets with @code{define-widget}. It allows
|
|
|
1264 you to create a shorthand for more complex widgets, including specifying
|
|
|
1265 component widgets and default new default values for the keyword
|
|
|
1266 arguments.
|
|
|
1267
|
|
|
1268 @defun widget-define name class doc &rest args
|
|
|
1269 Define a new widget type named @var{name} from @code{class}.
|
|
|
1270
|
|
|
1271 @var{name} and class should both be symbols, @code{class} should be one
|
|
|
1272 of the existing widget types.
|
|
|
1273
|
|
|
1274 The third argument @var{DOC} is a documentation string for the widget.
|
|
|
1275
|
|
|
1276 After the new widget has been defined, the following two calls will
|
|
|
1277 create identical widgets:
|
|
|
1278
|
|
|
1279 @itemize @bullet
|
|
|
1280 @item
|
|
|
1281 @lisp
|
|
|
1282 (widget-create @var{name})
|
|
|
1283 @end lisp
|
|
|
1284
|
|
|
1285 @item
|
|
|
1286 @lisp
|
|
|
1287 (apply widget-create @var{class} @var{args})
|
|
|
1288 @end lisp
|
|
|
1289 @end itemize
|
|
|
1290
|
|
|
1291 @end defun
|
|
|
1292
|
|
|
1293 Using @code{widget-define} does just store the definition of the widget
|
|
|
1294 type in the @code{widget-type} property of @var{name}, which is what
|
|
|
1295 @code{widget-create} uses.
|
|
|
1296
|
|
|
1297 If you just want to specify defaults for keywords with no complex
|
|
|
1298 conversions, you can use @code{identity} as your conversion function.
|
|
|
1299
|
|
|
1300 The following additional keyword arguments are useful when defining new
|
|
|
1301 widgets:
|
|
|
1302 @table @code
|
|
|
1303 @item :convert-widget
|
|
|
1304 Function to convert a widget type before creating a widget of that
|
|
|
1305 type. It takes a widget type as an argument, and returns the converted
|
|
|
1306 widget type. When a widget is created, this function is called for the
|
|
|
1307 widget type and all the widgets parent types, most derived first.
|
|
|
1308
|
|
|
1309 @item :value-to-internal
|
|
|
1310 Function to convert the value to the internal format. The function
|
|
|
1311 takes two arguments, a widget and an external value, and returns the
|
|
|
1312 internal value. The function is called on the present @code{:value}
|
|
|
1313 when the widget is created, and on any value set later with
|
|
|
1314 @code{widget-value-set}.
|
|
|
1315
|
|
|
1316 @item :value-to-external
|
|
|
1317 Function to convert the value to the external format. The function
|
|
|
1318 takes two arguments, a widget and an internal value, and returns the
|
|
|
1319 internal value. The function is called on the present @code{:value}
|
|
|
1320 when the widget is created, and on any value set later with
|
|
|
1321 @code{widget-value-set}.
|
|
|
1322
|
|
|
1323 @item :create
|
|
|
1324 Function to create a widget from scratch. The function takes one
|
|
|
1325 argument, a widget type, and create a widget of that type, insert it in
|
|
|
1326 the buffer, and return a widget object.
|
|
|
1327
|
|
|
1328 @item :delete
|
|
|
1329 Function to delete a widget. The function takes one argument, a widget,
|
|
|
1330 and should remove all traces of the widget from the buffer.
|
|
|
1331
|
|
|
1332 @item :value-create
|
|
|
1333 Function to expand the @samp{%v} escape in the format string. It will
|
|
|
1334 be called with the widget as its argument. Should
|
|
|
1335 insert a representation of the widgets value in the buffer.
|
|
|
1336
|
|
|
1337 @item :value-delete
|
|
|
1338 Should remove the representation of the widgets value from the buffer.
|
|
|
1339 It will be called with the widget as its argument. It doesn't have to
|
|
|
1340 remove the text, but it should release markers and delete nested widgets
|
|
|
1341 if such has been used.
|
|
|
1342
|
|
|
1343 @item :format-handler
|
|
|
1344 Function to handle unknown @samp{%} escapes in the format string. It
|
|
|
1345 will be called with the widget and the escape character as arguments.
|
|
|
1346 You can set this to allow your widget to handle non-standard escapes.
|
|
|
1347
|
|
|
1348 You should end up calling @code{widget-default-format-handler} to handle
|
|
|
1349 unknown escape sequences, which will handle the @samp{%h} and any future
|
|
|
1350 escape sequences, as well as give an error for unknown escapes.
|
|
|
1351 @end table
|
|
|
1352
|
|
|
1353 If you want to define a new widget from scratch, use the @code{default}
|
|
|
1354 widget as its base.
|
|
|
1355
|
|
|
1356 @deffn Widget default [ keyword argument ]
|
|
|
1357 Widget used as a base for other widgets.
|
|
|
1358
|
|
|
1359 It provides most of the functionality that is referred to as ``by
|
|
|
1360 default'' in this text.
|
|
|
1361 @end deffn
|
|
|
1362
|
|
|
1363 @node Widget Wishlist., , Defining New Widgets, Top
|
|
|
1364 @comment node-name, next, previous, up
|
|
|
1365 @section Wishlist.
|
|
|
1366
|
|
|
1367 @itemize @bullet
|
|
|
1368 @item
|
|
|
1369 It should be possible to add or remove items from a list with @kbd{C-k}
|
|
|
1370 and @kbd{C-o} (suggested by @sc{rms}).
|
|
|
1371
|
|
|
1372 @item
|
|
|
1373 The @samp{[INS]} and @samp{[DEL]} buttons should be replaced by a single
|
|
|
1374 dash (@samp{-}). The dash should be a button that, when activated, ask
|
|
|
1375 whether you want to add or delete an item (@sc{rms} wanted to git rid of
|
|
|
1376 the ugly buttons, the dash is my idea).
|
|
|
1377
|
|
|
1378 @item
|
|
|
1379 Widgets such as @code{file} and @code{symbol} should prompt with completion.
|
|
|
1380
|
|
|
1381 @item
|
|
|
1382 The @code{menu-choice} tag should be prettier, something like the abbreviated
|
|
|
1383 menus in Open Look.
|
|
|
1384
|
|
|
1385 @item
|
|
|
1386 The functions used in many widgets, like
|
|
|
1387 @code{widget-item-convert-widget}, should not have names that are
|
|
|
1388 specific to the first widget where I happended to use them.
|
|
|
1389
|
|
|
1390 @item
|
|
|
1391 Flag to make @code{widget-move} skip a specified button.
|
|
|
1392
|
|
|
1393 @item
|
|
|
1394 Document `helper' functions for defining new widgets.
|
|
|
1395
|
|
|
1396 @item
|
|
|
1397 Activate the item this is below the mouse when the button is
|
|
|
1398 released, not the item this is below the mouse when the button is
|
|
|
1399 pressed. Dired and grep gets this right. Give feedback if possible.
|
|
|
1400
|
|
|
1401 @item
|
|
|
1402 Use @samp{@@deffn Widget} to document widgets.
|
|
|
1403
|
|
|
1404 @item
|
|
|
1405 Document global keywords in one place.
|
|
|
1406
|
|
|
1407 Document keywords particular to a specific widget in the widget
|
|
|
1408 definition.
|
|
|
1409
|
|
|
1410 Document the `default' widget first.
|
|
|
1411
|
|
|
1412 Split, when needed, keywords into those useful for normal
|
|
|
1413 customization, those primarily useful when deriving, and those who
|
|
|
1414 represent runtime information.
|
|
|
1415
|
|
|
1416 @item
|
|
|
1417 Figure out terminology and @sc{api} for the class/type/object/super
|
|
|
1418 stuff.
|
|
|
1419
|
|
|
1420 Perhaps the correct model is delegation?
|
|
|
1421
|
|
|
1422 @item
|
|
|
1423 Document @code{widget-browse}.
|
|
|
1424
|
|
|
1425 @item
|
|
|
1426 Make indentation work with glyphs and propertional fonts.
|
|
|
1427
|
|
|
1428 @item
|
|
|
1429 Add object and class hierarchies to the browser.
|
|
|
1430
|
|
|
1431 @end itemize
|
|
|
1432
|
|
|
1433 @contents
|
|
|
1434 @bye
|
