Mercurial > hg > xemacs-beta
annotate man/widget.texi @ 5576:071b810ceb18
Declare labels as line where appropriate; use #'labels, not #'flet, tests.
lisp/ChangeLog addition:
2011-10-03 Aidan Kehoe <kehoea@parhasard.net>
* simple.el (handle-pre-motion-command-current-command-is-motion):
Implement #'keysyms-equal with #'labels + (declare (inline ...)),
instead of abusing macrolet to the same end.
* specifier.el (let-specifier):
* mule/mule-cmds.el (describe-language-environment):
* mule/mule-cmds.el (set-language-environment-coding-systems):
* mule/mule-x-init.el (x-use-halfwidth-roman-font):
* faces.el (Face-frob-property):
* keymap.el (key-sequence-list-description):
* lisp-mode.el (construct-lisp-mode-menu):
* loadhist.el (unload-feature):
* mouse.el (default-mouse-track-check-for-activation):
Declare various labels inline in dumped files when that reduces
the size of the dumped image. Declaring labels inline is normally
only worthwhile for inner loops and so on, but it's reasonable
exercise of the related code to have these changes in core.
tests/ChangeLog addition:
2011-10-03 Aidan Kehoe <kehoea@parhasard.net>
* automated/case-tests.el (uni-mappings):
* automated/database-tests.el (delete-database-files):
* automated/hash-table-tests.el (iterations):
* automated/lisp-tests.el (test1):
* automated/lisp-tests.el (a):
* automated/lisp-tests.el (cl-floor):
* automated/lisp-tests.el (foo):
* automated/lisp-tests.el (list-nreverse):
* automated/lisp-tests.el (needs-lexical-context):
* automated/mule-tests.el (featurep):
* automated/os-tests.el (original-string):
* automated/os-tests.el (with):
* automated/symbol-tests.el (check-weak-list-unique):
Replace #'flet with #'labels where appropriate in these tests,
following my own advice on style in the docstrings of those
functions.
author | Aidan Kehoe <kehoea@parhasard.net> |
---|---|
date | Mon, 03 Oct 2011 20:16:14 +0100 |
parents | 64be8a494bdc |
children | d11efddf3617 |
rev | line source |
---|---|
428 | 1 \input texinfo.tex |
2 @c %**start of header | |
3 @setfilename ../info/widget.info | |
4 @settitle The Emacs Widget Library | |
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5 @syncodeindex fn cp |
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6 @syncodeindex vr cp |
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7 @syncodeindex ky cp |
428 | 8 @c %**end of header |
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9 @c Synced up with: FSF 23.1.92. |
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10 @c Synced by: Ben Wing, 2-17-10. |
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11 |
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12 @copying |
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13 Copyright @copyright{} 2000, 2001, 2002, 2003, 2004, 2005, |
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14 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
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15 |
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16 @quotation |
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17 Permission is granted to copy, distribute and/or modify this document |
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18 under the terms of the GNU Free Documentation License, Version 1.3 or |
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19 any later version published by the Free Software Foundation; with no |
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20 Invariant Sections, with the Front-Cover texts being ``A GNU Manual'', |
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21 and with the Back-Cover Texts as in (a) below. A copy of the license |
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22 is included in the section entitled ``GNU Free Documentation License''. |
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23 |
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24 (a) The FSF's Back-Cover Text is: ``You have the freedom to copy and |
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25 modify this GNU manual. Buying copies from the FSF supports it in |
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26 developing GNU and promoting software freedom.'' |
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27 @end quotation |
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28 @end copying |
428 | 29 |
30 @ifinfo | |
31 @dircategory XEmacs Editor | |
32 @direntry | |
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33 * Widget: (widget). The "widget" package used by the Emacs Customization |
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34 facility. |
428 | 35 @end direntry |
36 @end ifinfo | |
37 | |
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38 @contents |
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39 |
428 | 40 @node Top, Introduction, (dir), (dir) |
41 @comment node-name, next, previous, up | |
42 @top The Emacs Widget Library | |
43 | |
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44 @insertcopying |
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45 |
428 | 46 @menu |
47 * Introduction:: | |
48 * User Interface:: | |
49 * Programming Example:: | |
50 * Setting Up the Buffer:: | |
51 * Basic Types:: | |
52 * Sexp Types:: | |
53 * Widget Properties:: | |
54 * Defining New Widgets:: | |
55 * Widget Browser:: | |
56 * Widget Minor Mode:: | |
57 * Utilities:: | |
58 * Widget Wishlist:: | |
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59 * Widget Internals:: |
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60 * GNU Free Documentation License:: |
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61 * Index:: |
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62 @detailmenu |
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63 --- The Detailed Node Listing --- |
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64 |
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65 The Emacs Widget Library |
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66 |
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67 * Introduction:: |
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68 * User Interface:: |
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69 * Programming Example:: |
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70 * Setting Up the Buffer:: |
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71 * Basic Types:: |
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72 * Sexp Types:: |
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73 * Widget Properties:: |
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74 * Defining New Widgets:: |
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75 * Widget Browser:: |
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76 * Widget Minor Mode:: |
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77 * Utilities:: |
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78 * Widget Wishlist:: |
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79 * Widget Internals:: |
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80 * GNU Free Documentation License:: |
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81 * Index:: |
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82 |
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83 Basic Types |
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84 |
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85 * link:: |
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86 * url-link:: |
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87 * info-link:: |
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88 * push-button:: |
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89 * editable-field:: |
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90 * text:: |
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91 * menu-choice:: |
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92 * radio-button-choice:: |
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93 * item:: |
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94 * choice-item:: |
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95 * toggle:: |
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96 * checkbox:: |
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97 * checklist:: |
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98 * editable-list:: |
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99 * group:: |
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100 |
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101 Sexp Types |
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102 |
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103 * constants:: |
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104 * generic:: |
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105 * atoms:: |
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106 * composite:: |
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107 |
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108 @end detailmenu |
428 | 109 @end menu |
110 | |
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111 |
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112 |
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113 |
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116 |
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118 |
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119 |
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120 |
428 | 121 @node Introduction, User Interface, Top, Top |
122 @comment node-name, next, previous, up | |
123 @section Introduction | |
124 | |
2028 | 125 @c XEmacs changes to reflect history, native widgets, and GTK |
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126 Most graphical user interface toolkits provide |
428 | 127 a number of standard user interface controls (sometimes known as |
2028 | 128 `widgets' or `gadgets'). Historically, Emacs didn't support anything like |
129 this, except for its incredible powerful text ``widget''. However, | |
130 since XEmacs 21.4, XEmacs has supported ``native'' widgets (GUI controls | |
131 implemented as Lisp APIs in C for the MS Windows, Motif, Athena, and GTK | |
132 toolkits) and libglade (GUI controls with an XML API for the GTK | |
133 toolkit). On the other hand, Emacs does provide the necessary | |
134 primitives to implement many other widgets within a text buffer, and of | |
135 course this is the only way to implement self-contained controls in a | |
136 text terminal. The @code{widget} package simplifies this task. | |
428 | 137 |
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138 @cindex basic widgets |
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139 @cindex widgets, basic types |
2028 | 140 Examples of some basic widgets include: |
428 | 141 |
142 @table @code | |
143 @item link | |
144 Areas of text with an associated action. Intended for hypertext links | |
145 embedded in text. | |
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146 @item push-button |
428 | 147 Like link, but intended for stand-alone buttons. |
148 @item editable-field | |
149 An editable text field. It can be either variable or fixed length. | |
150 @item menu-choice | |
151 Allows the user to choose one of multiple options from a menu, each | |
152 option is itself a widget. Only the selected option will be visible in | |
153 the buffer. | |
154 @item radio-button-choice | |
155 Allows the user to choose one of multiple options by activating radio | |
156 buttons. The options are implemented as widgets. All options will be | |
157 visible in the buffer. | |
158 @item item | |
159 A simple constant widget intended to be used in the @code{menu-choice} and | |
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160 @code{radio-button-choice} widgets. |
428 | 161 @item choice-item |
901 | 162 A button item only intended for use in choices. When invoked, the user |
428 | 163 will be asked to select another option from the choice widget. |
164 @item toggle | |
165 A simple @samp{on}/@samp{off} switch. | |
166 @item checkbox | |
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167 A checkbox (@samp{[ ]}/@samp{[X]}). |
428 | 168 @item editable-list |
169 Create an editable list. The user can insert or delete items in the | |
170 list. Each list item is itself a widget. | |
171 @end table | |
172 | |
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173 Now, of what possible use can support for widgets be in a text editor? |
428 | 174 I'm glad you asked. The answer is that widgets are useful for |
2028 | 175 implementing forms. A @dfn{form} in Emacs is a buffer where the user is |
428 | 176 supposed to fill out a number of fields, each of which has a specific |
177 meaning. The user is not supposed to change or delete any of the text | |
178 between the fields. Examples of forms in Emacs are the @file{forms} | |
179 package (of course), the customize buffers, the mail and news compose | |
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180 modes, and the @acronym{HTML} form support in the @file{w3} browser. |
428 | 181 |
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182 @cindex widget library, why use it |
428 | 183 The advantages for a programmer of using the @code{widget} package to |
184 implement forms are: | |
185 | |
186 @enumerate | |
187 @item | |
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188 More complex fields than just editable text are supported. |
428 | 189 @item |
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190 You can give the users immediate feedback if they enter invalid data in a |
428 | 191 text field, and sometimes prevent entering invalid data. |
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192 @item |
2028 | 193 You can have fixed sized fields, thus allowing multiple fields to be |
428 | 194 lined up in columns. |
195 @item | |
196 It is simple to query or set the value of a field. | |
197 @item | |
2028 | 198 Editing happens in a normal buffer, not in the mini-buffer. |
428 | 199 @item |
2028 | 200 Packages using the library get a uniform look-and-feel, making them easier for |
428 | 201 the user to learn. |
202 @item | |
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203 As support for embedded graphics improve, the widget library will be |
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204 extended to use the GUI features. This means that your code using the |
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205 widget library will also use the new graphic features automatically. |
2028 | 206 @item |
207 A widget specification is implemented as a class, and new subclasses can | |
208 be derived from any class, by restricting or extending the behavior. | |
428 | 209 @end enumerate |
210 | |
211 In order to minimize the code that is loaded by users who does not | |
212 create any widgets, the code has been split in two files: | |
213 | |
214 @table @file | |
215 @item widget.el | |
2028 | 216 This declares the user variables, defines the function |
217 @code{define-widget}, and autoloads the function @code{widget-create}. | |
428 | 218 @item wid-edit.el |
2028 | 219 Everything else is here. Do not load it explicitly, as |
428 | 220 it will be autoloaded when needed. |
221 @end table | |
222 | |
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223 In order to minimize the code that is loaded by users who does not |
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224 create any widgets, the code has been split in two files: |
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225 |
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226 @table @file |
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227 @item widget.el |
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228 This will declare the user variables, define the function |
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229 @code{widget-define}, and autoload the function @code{widget-create}. |
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230 @item wid-edit.el |
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231 Everything else is here, there is no reason to load it explicitly, as |
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232 it will be autoloaded when needed. |
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233 @end table |
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234 |
428 | 235 @node User Interface, Programming Example, Introduction, Top |
236 @comment node-name, next, previous, up | |
237 @section User Interface | |
238 | |
904 | 239 A form consists of read only text for documentation and some fields, |
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240 where each field contains two parts, a tag and a value. The tags are |
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241 used to identify the fields, so the documentation can refer to the |
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242 @samp{foo field}, meaning the field tagged with @samp{Foo}. Here is an |
904 | 243 example form: |
428 | 244 |
245 @example | |
246 Here is some documentation. | |
247 | |
248 Name: @i{My Name} @strong{Choose}: This option | |
249 Address: @i{Some Place | |
250 In some City | |
251 Some country.} | |
252 | |
253 See also @b{_other work_} for more information. | |
254 | |
255 Numbers: count to three below | |
256 @b{[INS]} @b{[DEL]} @i{One} | |
257 @b{[INS]} @b{[DEL]} @i{Eh, two?} | |
258 @b{[INS]} @b{[DEL]} @i{Five!} | |
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259 @b{[INS]} |
428 | 260 |
261 Select multiple: | |
262 | |
263 @b{[X]} This | |
264 @b{[ ]} That | |
265 @b{[X]} Thus | |
266 | |
267 Select one: | |
268 | |
269 @b{(*)} One | |
270 @b{( )} Another One. | |
271 @b{( )} A Final One. | |
272 | |
273 @b{[Apply Form]} @b{[Reset Form]} | |
274 @end example | |
275 | |
2028 | 276 The top level widgets in this example are tagged @samp{Name}, |
428 | 277 @samp{Choose}, @samp{Address}, @samp{_other work_}, @samp{Numbers}, |
278 @samp{Select multiple}, @samp{Select one}, @samp{[Apply Form]}, and | |
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279 @samp{[Reset Form]}. There are basically two things the user can do |
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280 within a form, namely editing the editable text fields and activating |
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281 the buttons. |
428 | 282 |
283 @subsection Editable Text Fields | |
284 | |
285 In the example, the value for the @samp{Name} is most likely displayed | |
286 in an editable text field, and so are values for each of the members of | |
287 the @samp{Numbers} list. All the normal Emacs editing operations are | |
288 available for editing these fields. The only restriction is that each | |
289 change you make must be contained within a single editable text field. | |
290 For example, capitalizing all text from the middle of one field to the | |
291 middle of another field is prohibited. | |
292 | |
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293 Editable text fields are created by the @code{editable-field} widget. |
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294 |
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295 @strong{Warning:} In an @code{editable-field} widget, the editable |
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296 field must not be adjacent to another widget---that won't work. |
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297 You must put some text in between. Either make this text part of |
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298 the @code{editable-field} widget itself, or insert it with |
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299 @code{widget-insert}. |
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300 |
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301 The @code{:format} keyword is useful for generating the necessary |
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302 text; for instance, if you give it a value of @code{"Name: %v "}, |
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303 the @samp{Name: } part will provide the necessary separating text |
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304 before the field and the trailing space will provide the |
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305 separating text after the field. If you don't include the |
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306 @code{:size} keyword, the field will extend to the end of the |
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307 line, and the terminating newline will provide separation after. |
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308 |
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309 @strong{Warning:} In an @code{editable-field} widget, the @samp{%v} escape |
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310 must be preceded by some other text in the @code{:format} string |
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311 (if specified). |
428 | 312 |
313 The editing text fields are highlighted with the | |
314 @code{widget-field-face} face, making them easy to find. | |
315 | |
316 @deffn Face widget-field-face | |
317 Face used for other editing fields. | |
318 @end deffn | |
319 | |
320 @subsection Buttons | |
321 | |
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322 @cindex widget buttons |
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323 @cindex button widgets |
428 | 324 Some portions of the buffer have an associated @dfn{action}, which can |
325 be @dfn{invoked} by a standard key or mouse command. These portions | |
326 are called @dfn{buttons}. The default commands for activating a button | |
327 are: | |
328 | |
329 @table @kbd | |
330 @item @key{RET} | |
331 @deffn Command widget-button-press @var{pos} &optional @var{event} | |
332 Invoke the button at @var{pos}, defaulting to point. | |
333 If point is not located on a button, invoke the binding in | |
334 @code{widget-global-map} (by default the global map). | |
335 @end deffn | |
336 | |
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337 @kindex Mouse-2 @r{(on button widgets}) |
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338 @item Mouse-2 |
428 | 339 @deffn Command widget-button-click @var{event} |
340 Invoke the button at the location of the mouse pointer. If the mouse | |
341 pointer is located in an editable text field, invoke the binding in | |
342 @code{widget-global-map} (by default the global map). | |
343 @end deffn | |
344 @end table | |
345 | |
346 There are several different kind of buttons, all of which are present in | |
347 the example: | |
348 | |
349 @table @emph | |
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350 @cindex option field tag |
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351 @item The Option Field Tags |
428 | 352 When you invoke one of these buttons, you will be asked to choose |
353 between a number of different options. This is how you edit an option | |
354 field. Option fields are created by the @code{menu-choice} widget. In | |
355 the example, @samp{@b{Choose}} is an option field tag. | |
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356 @item The @samp{@b{[INS]}} and @samp{@b{[DEL]}} buttons |
904 | 357 Activating these will insert or delete elements from an editable list. |
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358 The list is created by the @code{editable-list} widget. |
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359 @cindex embedded buttons |
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360 @item Embedded Buttons |
428 | 361 The @samp{@b{_other work_}} is an example of an embedded |
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362 button. Embedded buttons are not associated with any fields, but can serve |
428 | 363 any purpose, such as implementing hypertext references. They are |
364 usually created by the @code{link} widget. | |
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365 @item The @samp{@b{[ ]}} and @samp{@b{[X]}} buttons |
428 | 366 Activating one of these will convert it to the other. This is useful |
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367 for implementing multiple-choice fields. You can create them with the |
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368 @code{checkbox} widget. |
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369 @item The @samp{@b{( )}} and @samp{@b{(*)}} buttons |
428 | 370 Only one radio button in a @code{radio-button-choice} widget can be |
371 selected at any time. When you invoke one of the unselected radio | |
372 buttons, it will be selected and the previous selected radio button will | |
373 become unselected. | |
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374 @item The @samp{@b{[Apply Form]}} and @samp{@b{[Reset Form]}} buttons |
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375 These are explicit buttons made with the @code{push-button} widget. The |
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376 main difference from the @code{link} widget is that the buttons will be |
428 | 377 displayed as GUI buttons when possible. |
378 @end table | |
379 | |
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380 To make them easier to locate, buttons are emphasized in the buffer. |
428 | 381 |
382 @deffn Face widget-button-face | |
383 Face used for buttons. | |
384 @end deffn | |
385 | |
386 @defopt widget-mouse-face | |
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387 Face used for highlighting a button when the mouse pointer moves across |
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388 it. |
428 | 389 @end defopt |
390 | |
391 @subsection Navigation | |
392 | |
393 You can use all the normal Emacs commands to move around in a form | |
394 buffer, plus you will have these additional commands: | |
395 | |
396 @table @kbd | |
397 @item @key{TAB} | |
398 @deffn Command widget-forward &optional count | |
399 Move point @var{count} buttons or editing fields forward. | |
400 @end deffn | |
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401 @item @kbd{M-@key{TAB}} |
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402 @itemx @kbd{S-@key{TAB}} |
428 | 403 @deffn Command widget-backward &optional count |
404 Move point @var{count} buttons or editing fields backward. | |
405 @end deffn | |
406 @end table | |
407 | |
408 @node Programming Example, Setting Up the Buffer, User Interface, Top | |
409 @comment node-name, next, previous, up | |
410 @section Programming Example | |
411 | |
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412 @cindex widgets, programming example |
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413 @cindex example of using widgets |
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414 Here is the code to implement the user interface example (@pxref{User |
428 | 415 Interface}). |
416 | |
417 @lisp | |
418 (require 'widget) | |
419 | |
420 (eval-when-compile | |
421 (require 'wid-edit)) | |
422 | |
423 (defvar widget-example-repeat) | |
424 | |
425 (defun widget-example () | |
426 "Create the widgets from the Widget manual." | |
427 (interactive) | |
428 (kill-buffer (get-buffer-create "*Widget Example*")) | |
429 (switch-to-buffer (get-buffer-create "*Widget Example*")) | |
430 (kill-all-local-variables) | |
431 (make-local-variable 'widget-example-repeat) | |
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432 (widget-insert "Here is some documentation.\n\n") |
428 | 433 (widget-create 'editable-field |
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434 :size 13 |
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435 :format "Name: %v " ; Text after the field! |
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436 "My Name") |
428 | 437 (widget-create 'menu-choice |
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438 :tag "Choose" |
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439 :value "This" |
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440 :help-echo "Choose me, please!" |
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441 :notify (lambda (widget &rest ignore) |
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442 (message "%s is a good choice!" |
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443 (widget-value widget))) |
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444 '(item :tag "This option" :value "This") |
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445 '(choice-item "That option") |
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446 '(editable-field :menu-tag "No option" "Thus option")) |
428 | 447 (widget-create 'editable-field |
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448 :format "Address: %v" |
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449 "Some Place\nIn some City\nSome country.") |
428 | 450 (widget-insert "\nSee also ") |
451 (widget-create 'link | |
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452 :notify (lambda (&rest ignore) |
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453 (widget-value-set widget-example-repeat |
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454 '("En" "To" "Tre")) |
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455 (widget-setup)) |
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456 "other work") |
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457 (widget-insert |
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458 " for more information.\n\nNumbers: count to three below\n") |
428 | 459 (setq widget-example-repeat |
440 | 460 (widget-create 'editable-list |
461 :entry-format "%i %d %v" | |
462 :notify (lambda (widget &rest ignore) | |
463 (let ((old (widget-get widget | |
464 ':example-length)) | |
465 (new (length (widget-value widget)))) | |
466 (unless (eq old new) | |
467 (widget-put widget ':example-length new) | |
468 (message "You can count to %d." new)))) | |
469 :value '("One" "Eh, two?" "Five!") | |
470 '(editable-field :value "three"))) | |
428 | 471 (widget-insert "\n\nSelect multiple:\n\n") |
472 (widget-create 'checkbox t) | |
473 (widget-insert " This\n") | |
474 (widget-create 'checkbox nil) | |
475 (widget-insert " That\n") | |
476 (widget-create 'checkbox | |
440 | 477 :notify (lambda (&rest ignore) (message "Tickle")) |
478 t) | |
428 | 479 (widget-insert " Thus\n\nSelect one:\n\n") |
480 (widget-create 'radio-button-choice | |
440 | 481 :value "One" |
482 :notify (lambda (widget &rest ignore) | |
483 (message "You selected %s" | |
484 (widget-value widget))) | |
485 '(item "One") '(item "Another One.") '(item "A Final One.")) | |
428 | 486 (widget-insert "\n") |
487 (widget-create 'push-button | |
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488 :notify (lambda (&rest ignore) |
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489 (if (= (length (widget-value widget-example-repeat)) |
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490 3) |
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491 (message "Congratulation!") |
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492 (error "Three was the count!"))) |
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493 "Apply Form") |
428 | 494 (widget-insert " ") |
495 (widget-create 'push-button | |
440 | 496 :notify (lambda (&rest ignore) |
497 (widget-example)) | |
498 "Reset Form") | |
428 | 499 (widget-insert "\n") |
500 (use-local-map widget-keymap) | |
501 (widget-setup)) | |
502 @end lisp | |
503 | |
504 @node Setting Up the Buffer, Basic Types, Programming Example, Top | |
505 @comment node-name, next, previous, up | |
506 @section Setting Up the Buffer | |
507 | |
508 Widgets are created with @code{widget-create}, which returns a | |
509 @dfn{widget} object. This object can be queried and manipulated by | |
510 other widget functions, until it is deleted with @code{widget-delete}. | |
511 After the widgets have been created, @code{widget-setup} must be called | |
512 to enable them. | |
513 | |
514 @defun widget-create type [ keyword argument ]@dots{} | |
515 Create and return a widget of type @var{type}. | |
516 The syntax for the @var{type} argument is described in @ref{Basic Types}. | |
517 | |
518 The keyword arguments can be used to overwrite the keyword arguments | |
519 that are part of @var{type}. | |
520 @end defun | |
521 | |
522 @defun widget-delete widget | |
523 Delete @var{widget} and remove it from the buffer. | |
524 @end defun | |
525 | |
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526 @defun widget-setup |
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527 Set up a buffer to support widgets. |
428 | 528 |
529 This should be called after creating all the widgets and before allowing | |
530 the user to edit them. | |
531 @refill | |
532 @end defun | |
533 | |
534 If you want to insert text outside the widgets in the form, the | |
535 recommended way to do that is with @code{widget-insert}. | |
536 | |
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537 @defun widget-insert |
428 | 538 Insert the arguments, either strings or characters, at point. |
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539 The inserted text will be read-only. |
428 | 540 @end defun |
541 | |
542 There is a standard widget keymap which you might find useful. | |
543 | |
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544 @findex widget-button-press |
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545 @findex widget-button-click |
428 | 546 @defvr Const widget-keymap |
547 A keymap with the global keymap as its parent.@* | |
548 @key{TAB} and @kbd{C-@key{TAB}} are bound to @code{widget-forward} and | |
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549 @code{widget-backward}, respectively. @key{RET} and @kbd{Mouse-2} |
428 | 550 are bound to @code{widget-button-press} and |
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551 @code{widget-button-click}.@refill |
428 | 552 @end defvr |
553 | |
554 @defvar widget-global-map | |
555 Keymap used by @code{widget-button-press} and @code{widget-button-click} | |
556 when not on a button. By default this is @code{global-map}. | |
557 @end defvar | |
558 | |
559 @node Basic Types, Sexp Types, Setting Up the Buffer, Top | |
560 @comment node-name, next, previous, up | |
561 @section Basic Types | |
562 | |
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563 This is the general syntax of a type specification: |
428 | 564 |
565 @example | |
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566 @var{name} ::= (@var{name} [@var{keyword} @var{argument}]... @var{args}) |
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567 | @var{name} |
428 | 568 @end example |
569 | |
444 | 570 where @var{name} is a widget name, @var{keyword} is the name of a |
428 | 571 property, @var{argument} is the value of the property, and @var{args} |
572 are interpreted in a widget specific way. | |
573 | |
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574 @cindex keyword arguments |
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575 The following keyword arguments apply to all widgets: |
428 | 576 |
577 @table @code | |
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578 @vindex value@r{ keyword} |
428 | 579 @item :value |
580 The initial value for widgets of this type. | |
581 | |
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582 @vindex format@r{ keyword} |
428 | 583 @item :format |
584 This string will be inserted in the buffer when you create a widget. | |
585 The following @samp{%} escapes are available: | |
586 | |
587 @table @samp | |
588 @item %[ | |
589 @itemx %] | |
590 The text inside will be marked as a button. | |
591 | |
592 By default, the text will be shown in @code{widget-button-face}, and | |
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593 surrounded by brackets. |
428 | 594 |
595 @defopt widget-button-prefix | |
596 String to prefix buttons. | |
597 @end defopt | |
598 | |
599 @defopt widget-button-suffix | |
600 String to suffix buttons. | |
601 @end defopt | |
602 | |
603 @item %@{ | |
604 @itemx %@} | |
434 | 605 The text inside will be displayed in the face specified by |
606 @code{:sample-face}. | |
428 | 607 |
608 @item %v | |
434 | 609 This will be replaced with the buffer representation of the widget's |
428 | 610 value. What this is depends on the widget type. |
611 | |
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612 @strong{Warning:} In an @code{editable-field} widget, the @samp{%v} escape |
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613 must be preceded by some other text in the format string (if specified). |
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614 |
428 | 615 @item %d |
616 Insert the string specified by @code{:doc} here. | |
617 | |
618 @item %h | |
619 Like @samp{%d}, with the following modifications: If the documentation | |
620 string is more than one line, it will add a button which will toggle | |
621 between showing only the first line, and showing the full text. | |
622 Furthermore, if there is no @code{:doc} property in the widget, it will | |
623 instead examine the @code{:documentation-property} property. If it is a | |
624 lambda expression, it will be called with the widget's value as an | |
625 argument, and the result will be used as the documentation text. | |
626 | |
627 @item %t | |
628 Insert the string specified by @code{:tag} here, or the @code{princ} | |
629 representation of the value if there is no tag. | |
630 | |
631 @item %% | |
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632 Insert a literal @samp{%}. |
428 | 633 @end table |
634 | |
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635 @vindex button-face@r{ keyword} |
428 | 636 @item :button-face |
637 Face used to highlight text inside %[ %] in the format. | |
638 | |
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639 @vindex button-prefix@r{ keyword} |
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640 @vindex button-suffix@r{ keyword} |
428 | 641 @item :button-prefix |
642 @itemx :button-suffix | |
643 Text around %[ %] in the format. | |
644 | |
645 These can be | |
646 @table @emph | |
647 @item nil | |
648 No text is inserted. | |
649 | |
650 @item a string | |
651 The string is inserted literally. | |
652 | |
653 @item a symbol | |
654 The value of the symbol is expanded according to this table. | |
655 @end table | |
656 | |
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657 @vindex doc@r{ keyword} |
428 | 658 @item :doc |
444 | 659 The string inserted by the @samp{%d} or @samp{%h} escape in the format |
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660 string. |
428 | 661 |
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662 @vindex tag@r{ keyword} |
428 | 663 @item :tag |
664 The string inserted by the @samp{%t} escape in the format | |
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665 string. |
428 | 666 |
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667 @vindex tag-glyph@r{ keyword} |
428 | 668 @item :tag-glyph |
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669 Name of image to use instead of the string specified by @code{:tag} on |
428 | 670 Emacsen that supports it. |
671 | |
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672 @vindex help-echo@r{ keyword} |
428 | 673 @item :help-echo |
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674 Specifies how to display a message whenever you move to the widget with |
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675 either @code{widget-forward} or @code{widget-backward} or move the mouse |
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676 over it (using the standard @code{help-echo} mechanism). The argument |
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677 is either a string to display, a function of one argument, the widget, |
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678 which should return a string to display, or a form that evaluates to |
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679 such a string. |
428 | 680 |
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681 @vindex follow-link@r{ keyword} |
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682 @item :follow-link |
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683 Specifies how to interpret a @key{mouse-1} click on the widget. |
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684 @xref{Clickable Text,, Defining Clickable Text, elisp, the Emacs Lisp Reference Manual}. |
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685 |
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686 @vindex indent@r{ keyword} |
428 | 687 @item :indent |
688 An integer indicating the absolute number of spaces to indent children | |
689 of this widget. | |
690 | |
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691 @vindex offset@r{ keyword} |
428 | 692 @item :offset |
693 An integer indicating how many extra spaces to add to the widget's | |
694 grandchildren compared to this widget. | |
695 | |
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696 @vindex extra-offset@r{ keyword} |
428 | 697 @item :extra-offset |
698 An integer indicating how many extra spaces to add to the widget's | |
699 children compared to this widget. | |
700 | |
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701 @vindex notify@r{ keyword} |
428 | 702 @item :notify |
703 A function called each time the widget or a nested widget is changed. | |
704 The function is called with two or three arguments. The first argument | |
705 is the widget itself, the second argument is the widget that was | |
706 changed, and the third argument is the event leading to the change, if | |
652 | 707 any. In editable fields, this includes all insertions, deletions, |
708 @emph{etc}. To watch only for ``final'' actions, redefine the | |
709 @code{:action} callback. | |
428 | 710 |
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711 @vindex menu-tag@r{ keyword} |
428 | 712 @item :menu-tag |
713 Tag used in the menu when the widget is used as an option in a | |
714 @code{menu-choice} widget. | |
715 | |
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716 @vindex menu-tag-get@r{ keyword} |
428 | 717 @item :menu-tag-get |
718 Function used for finding the tag when the widget is used as an option | |
719 in a @code{menu-choice} widget. By default, the tag used will be either the | |
720 @code{:menu-tag} or @code{:tag} property if present, or the @code{princ} | |
721 representation of the @code{:value} property if not. | |
722 | |
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723 @vindex match@r{ keyword} |
428 | 724 @item :match |
725 Should be a function called with two arguments, the widget and a value, | |
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726 and returning non-@code{nil} if the widget can represent the specified value. |
428 | 727 |
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728 @vindex validate@r{ keyword} |
428 | 729 @item :validate |
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730 A function which takes a widget as an argument, and returns @code{nil} |
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731 if the widget's current value is valid for the widget. Otherwise it |
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732 should return the widget containing the invalid data, and set that |
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733 widget's @code{:error} property to a string explaining the error. |
428 | 734 |
735 The following predefined function can be used: | |
736 | |
737 @defun widget-children-validate widget | |
738 All the @code{:children} of @var{widget} must be valid. | |
739 @end defun | |
740 | |
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741 @vindex tab-order@r{ keyword} |
428 | 742 @item :tab-order |
743 Specify the order in which widgets are traversed with | |
744 @code{widget-forward} or @code{widget-backward}. This is only partially | |
745 implemented. | |
746 | |
747 @enumerate a | |
748 @item | |
749 Widgets with tabbing order @code{-1} are ignored. | |
750 | |
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751 @item |
428 | 752 (Unimplemented) When on a widget with tabbing order @var{n}, go to the |
753 next widget in the buffer with tabbing order @var{n+1} or @code{nil}, | |
754 whichever comes first. | |
755 | |
756 @item | |
757 When on a widget with no tabbing order specified, go to the next widget | |
758 in the buffer with a positive tabbing order, or @code{nil} | |
759 @end enumerate | |
760 | |
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761 @vindex parent@r{ keyword} |
428 | 762 @item :parent |
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763 The parent of a nested widget (e.g.@: a @code{menu-choice} item or an |
904 | 764 element of an @code{editable-list} widget). |
428 | 765 |
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766 @vindex sibling-args@r{ keyword} |
428 | 767 @item :sibling-args |
768 This keyword is only used for members of a @code{radio-button-choice} or | |
769 @code{checklist}. The value should be a list of extra keyword | |
770 arguments, which will be used when creating the @code{radio-button} or | |
771 @code{checkbox} associated with this item. | |
772 | |
773 @end table | |
774 | |
775 @deffn {User Option} widget-glyph-directory | |
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776 Directory where glyphs are found. |
428 | 777 Widget will look here for a file with the same name as specified for the |
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778 image, with either a @file{.xpm} (if supported) or @file{.xbm} extension. |
428 | 779 @end deffn |
780 | |
781 @deffn{User Option} widget-glyph-enable | |
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782 If non-@code{nil}, allow glyphs to appear on displays where they are supported. |
428 | 783 @end deffn |
784 | |
785 | |
786 @menu | |
787 * link:: | |
788 * url-link:: | |
789 * info-link:: | |
790 * push-button:: | |
791 * editable-field:: | |
792 * text:: | |
793 * menu-choice:: | |
794 * radio-button-choice:: | |
795 * item:: | |
796 * choice-item:: | |
797 * toggle:: | |
798 * checkbox:: | |
799 * checklist:: | |
800 * editable-list:: | |
801 * group:: | |
802 @end menu | |
803 | |
804 @node link, url-link, Basic Types, Basic Types | |
805 @comment node-name, next, previous, up | |
806 @subsection The @code{link} Widget | |
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807 @findex link@r{ widget} |
428 | 808 |
809 Syntax: | |
810 | |
811 @example | |
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812 @var{type} ::= (link [@var{keyword} @var{argument}]... [ @var{value} ]) |
428 | 813 @end example |
814 | |
815 The @var{value}, if present, is used to initialize the @code{:value} | |
816 property. The value should be a string, which will be inserted in the | |
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817 buffer. |
428 | 818 |
819 By default the link will be shown in brackets. | |
820 | |
821 @defopt widget-link-prefix | |
822 String to prefix links. | |
823 @end defopt | |
824 | |
825 @defopt widget-link-suffix | |
826 String to suffix links. | |
827 @end defopt | |
828 | |
829 @node url-link, info-link, link, Basic Types | |
830 @comment node-name, next, previous, up | |
831 @subsection The @code{url-link} Widget | |
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832 @findex url-link@r{ widget} |
428 | 833 |
834 Syntax: | |
835 | |
836 @example | |
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837 @var{type} ::= (url-link [@var{keyword} @var{argument}]... @var{url}) |
428 | 838 @end example |
839 | |
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840 @findex browse-url-browser-function@r{, and @code{url-link} widget} |
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841 When this link is invoked, the @acronym{WWW} browser specified by |
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842 @code{browse-url-browser-function} will be called with @var{url}. |
428 | 843 |
844 @node info-link, push-button, url-link, Basic Types | |
845 @comment node-name, next, previous, up | |
846 @subsection The @code{info-link} Widget | |
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847 @findex info-link@r{ widget} |
428 | 848 |
849 Syntax: | |
850 | |
851 @example | |
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852 @var{type} ::= (info-link [@var{keyword} @var{argument}]... @var{address}) |
428 | 853 @end example |
854 | |
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855 When this link is invoked, the built-in Info reader is started on |
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856 @var{address}. |
428 | 857 |
858 @node push-button, editable-field, info-link, Basic Types | |
859 @comment node-name, next, previous, up | |
860 @subsection The @code{push-button} Widget | |
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861 @findex push-button@r{ widget} |
428 | 862 |
863 Syntax: | |
864 | |
865 @example | |
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866 @var{type} ::= (push-button [@var{keyword} @var{argument}]... [ @var{value} ]) |
428 | 867 @end example |
868 | |
869 The @var{value}, if present, is used to initialize the @code{:value} | |
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870 property. The value should be a string, which will be inserted in the |
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871 buffer. |
428 | 872 |
873 By default the tag will be shown in brackets. | |
874 | |
875 @defopt widget-push-button-prefix | |
876 String to prefix push buttons. | |
877 @end defopt | |
878 | |
879 @defopt widget-push-button-suffix | |
880 String to suffix push buttons. | |
881 @end defopt | |
882 | |
883 @node editable-field, text, push-button, Basic Types | |
884 @comment node-name, next, previous, up | |
885 @subsection The @code{editable-field} Widget | |
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886 @findex editable-field@r{ widget} |
428 | 887 |
888 Syntax: | |
889 | |
890 @example | |
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891 @var{type} ::= (editable-field [@var{keyword} @var{argument}]... [ @var{value} ]) |
428 | 892 @end example |
893 | |
894 The @var{value}, if present, is used to initialize the @code{:value} | |
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895 property. The value should be a string, which will be inserted in the |
428 | 896 field. This widget will match all string values. |
897 | |
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898 The following extra properties are recognized: |
428 | 899 |
900 @table @code | |
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901 @vindex size@r{ keyword} |
428 | 902 @item :size |
444 | 903 The minimum width of the editable field.@* |
904 By default the field will reach to the end of the line. If the | |
905 content is too large, the displayed representation will expand to | |
906 contain it. The content is not truncated to size. | |
428 | 907 |
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908 @vindex value-face@r{ keyword} |
428 | 909 @item :value-face |
910 Face used for highlighting the editable field. Default is | |
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911 @code{widget-field-face}, see @ref{User Interface}. |
428 | 912 |
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913 @vindex secret@r{ keyword} |
428 | 914 @item :secret |
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915 Character used to display the value. You can set this to e.g.@: @code{?*} |
428 | 916 if the field contains a password or other secret information. By |
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917 default, this is @code{nil}, and the value is not secret. |
428 | 918 |
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919 @vindex valid-regexp@r{ keyword} |
428 | 920 @item :valid-regexp |
921 By default the @code{:validate} function will match the content of the | |
922 field with the value of this attribute. The default value is @code{""} | |
923 which matches everything. | |
924 | |
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925 @vindex keymap@r{ keyword} |
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926 @vindex widget-field-keymap |
428 | 927 @item :keymap |
928 Keymap used in the editable field. The default value is | |
929 @code{widget-field-keymap}, which allows you to use all the normal | |
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930 editing commands, even if the buffer's major mode suppresses some of |
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931 them. Pressing @key{RET} invokes the function specified by |
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932 @code{:action}. |
428 | 933 @end table |
934 | |
935 @node text, menu-choice, editable-field, Basic Types | |
936 @comment node-name, next, previous, up | |
937 @subsection The @code{text} Widget | |
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938 @findex text@r{ widget} |
428 | 939 |
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940 @vindex widget-text-keymap |
428 | 941 This is just like @code{editable-field}, but intended for multiline text |
942 fields. The default @code{:keymap} is @code{widget-text-keymap}, which | |
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943 does not rebind the @key{RET} key. |
428 | 944 |
945 @node menu-choice, radio-button-choice, text, Basic Types | |
946 @comment node-name, next, previous, up | |
947 @subsection The @code{menu-choice} Widget | |
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948 @findex menu-choice@r{ widget} |
428 | 949 |
950 Syntax: | |
951 | |
952 @example | |
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953 @var{type} ::= (menu-choice [@var{keyword} @var{argument}]... @var{type} ... ) |
428 | 954 @end example |
955 | |
434 | 956 The @var{type} argument represents each possible choice. The widget's |
957 value will be that of the chosen @var{type} argument. This widget will | |
958 match any value matching at least one of the specified @var{type} | |
959 arguments. | |
428 | 960 |
961 @table @code | |
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962 @vindex void@r{ keyword} |
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963 @item :void |
428 | 964 Widget type used as a fallback when the value does not match any of the |
965 specified @var{type} arguments. | |
966 | |
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967 @vindex case-fold@r{ keyword} |
428 | 968 @item :case-fold |
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969 Set this to @code{nil} if you don't want to ignore case when prompting for a |
428 | 970 choice through the minibuffer. |
971 | |
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972 @vindex children@r{ keyword} |
428 | 973 @item :children |
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974 A list whose @sc{car} is the widget representing the currently chosen |
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975 type in the buffer. |
428 | 976 |
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977 @vindex choice@r{ keyword} |
428 | 978 @item :choice |
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979 The current chosen type. |
428 | 980 |
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981 @vindex args@r{ keyword} |
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982 @item :args |
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983 The list of types. |
428 | 984 @end table |
985 | |
986 @node radio-button-choice, item, menu-choice, Basic Types | |
987 @comment node-name, next, previous, up | |
988 @subsection The @code{radio-button-choice} Widget | |
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989 @findex radio-button-choice@r{ widget} |
428 | 990 |
991 Syntax: | |
992 | |
993 @example | |
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994 @var{type} ::= (radio-button-choice [@var{keyword} @var{argument}]... @var{type} ... ) |
428 | 995 @end example |
996 | |
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997 The component types specify the choices, with one radio button for |
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998 each. The widget's value will be that of the chosen @var{type} |
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999 argument. This widget matches any value that matches at least one of |
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1000 the specified @var{type} arguments. |
428 | 1001 |
1002 The following extra properties are recognized. | |
1003 | |
1004 @table @code | |
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1005 @vindex entry-format@r{ keyword} |
428 | 1006 @item :entry-format |
1007 This string will be inserted for each entry in the list. | |
1008 The following @samp{%} escapes are available: | |
1009 @table @samp | |
1010 @item %v | |
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1011 Replace with the buffer representation of the @var{type} widget. |
428 | 1012 @item %b |
1013 Replace with the radio button. | |
1014 @item %% | |
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1015 Insert a literal @samp{%}. |
428 | 1016 @end table |
1017 | |
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1018 @vindex button-args@r{ keyword} |
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1019 @item :button-args |
428 | 1020 A list of keywords to pass to the radio buttons. Useful for setting |
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1021 e.g.@: the @samp{:help-echo} for each button. |
428 | 1022 |
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1023 @vindex buttons@r{ keyword} |
428 | 1024 @item :buttons |
1025 The widgets representing the radio buttons. | |
1026 | |
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1027 @vindex children@r{ keyword} |
428 | 1028 @item :children |
1029 The widgets representing each type. | |
1030 | |
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1031 @vindex choice@r{ keyword} |
428 | 1032 @item :choice |
1033 The current chosen type | |
1034 | |
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1035 @vindex args@r{ keyword} |
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1036 @item :args |
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1037 The list of types. |
428 | 1038 @end table |
1039 | |
1040 You can add extra radio button items to a @code{radio-button-choice} | |
1041 widget after it has been created with the function | |
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1042 @code{widget-radio-add-item}. |
428 | 1043 |
1044 @defun widget-radio-add-item widget type | |
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1045 Add to @code{radio-button-choice} widget @var{widget} a new radio button |
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1046 item of type @var{type}. |
428 | 1047 @end defun |
1048 | |
1049 Please note that such items added after the @code{radio-button-choice} | |
1050 widget has been created will @strong{not} be properly destructed when | |
1051 you call @code{widget-delete}. | |
1052 | |
1053 @node item, choice-item, radio-button-choice, Basic Types | |
1054 @comment node-name, next, previous, up | |
1055 @subsection The @code{item} Widget | |
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1056 @findex item@r{ widget} |
428 | 1057 |
1058 Syntax: | |
1059 | |
1060 @example | |
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1061 @var{item} ::= (item [@var{keyword} @var{argument}]... @var{value}) |
428 | 1062 @end example |
1063 | |
1064 The @var{value}, if present, is used to initialize the @code{:value} | |
1065 property. The value should be a string, which will be inserted in the | |
1066 buffer. This widget will only match the specified value. | |
1067 | |
1068 @node choice-item, toggle, item, Basic Types | |
1069 @comment node-name, next, previous, up | |
1070 @subsection The @code{choice-item} Widget | |
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1071 @findex choice-item@r{ widget} |
428 | 1072 |
1073 Syntax: | |
1074 | |
1075 @example | |
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1076 @var{item} ::= (choice-item [@var{keyword} @var{argument}]... @var{value}) |
428 | 1077 @end example |
1078 | |
1079 The @var{value}, if present, is used to initialize the @code{:value} | |
1080 property. The value should be a string, which will be inserted in the | |
1081 buffer as a button. Activating the button of a @code{choice-item} is | |
1082 equivalent to activating the parent widget. This widget will only match | |
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1083 the specified value. |
428 | 1084 |
1085 @node toggle, checkbox, choice-item, Basic Types | |
1086 @comment node-name, next, previous, up | |
1087 @subsection The @code{toggle} Widget | |
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1088 @findex toggle@r{ widget} |
428 | 1089 |
1090 Syntax: | |
1091 | |
1092 @example | |
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1093 @var{type} ::= (toggle [@var{keyword} @var{argument}]...) |
428 | 1094 @end example |
1095 | |
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1096 The widget has two possible states, @samp{on} and @samp{off}, which |
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1097 correspond to a @code{t} or @code{nil} value, respectively. |
428 | 1098 |
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1099 The following extra properties are recognized: |
428 | 1100 |
1101 @table @code | |
1102 @item :on | |
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1103 A string representing the @samp{on} state. By default the string |
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1104 @samp{on}. |
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1105 @item :off |
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1106 A string representing the @samp{off} state. By default the string |
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1107 @samp{off}. |
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1108 @vindex on-glyph@r{ keyword} |
428 | 1109 @item :on-glyph |
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1110 Name of a glyph to be used instead of the @samp{:on} text string, on |
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1111 emacsen that supports this. |
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1112 @vindex off-glyph@r{ keyword} |
428 | 1113 @item :off-glyph |
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1114 Name of a glyph to be used instead of the @samp{:off} text string, on |
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1115 emacsen that supports this. |
428 | 1116 @end table |
1117 | |
1118 @node checkbox, checklist, toggle, Basic Types | |
1119 @comment node-name, next, previous, up | |
1120 @subsection The @code{checkbox} Widget | |
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1121 @findex checkbox@r{ widget} |
428 | 1122 |
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1123 This widget has two possible states, @samp{selected} and |
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1124 @samp{unselected}, which corresponds to a @code{t} or @code{nil} value. |
428 | 1125 |
1126 Syntax: | |
1127 | |
1128 @example | |
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1129 @var{type} ::= (checkbox [@var{keyword} @var{argument}]...) |
428 | 1130 @end example |
1131 | |
1132 @node checklist, editable-list, checkbox, Basic Types | |
1133 @comment node-name, next, previous, up | |
1134 @subsection The @code{checklist} Widget | |
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1135 @findex checklist@r{ widget} |
428 | 1136 |
1137 Syntax: | |
1138 | |
1139 @example | |
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1140 @var{type} ::= (checklist [@var{keyword} @var{argument}]... @var{type} ... ) |
428 | 1141 @end example |
1142 | |
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1143 The @var{type} arguments represent each checklist item. The widget's |
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1144 value will be a list containing the values of all checked @var{type} |
434 | 1145 arguments. The checklist widget will match a list whose elements all |
1146 match at least one of the specified @var{type} arguments. | |
428 | 1147 |
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1148 The following extra properties are recognized: |
428 | 1149 |
1150 @table @code | |
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1151 @vindex entry-format@r{ keyword} |
428 | 1152 @item :entry-format |
1153 This string will be inserted for each entry in the list. | |
1154 The following @samp{%} escapes are available: | |
1155 @table @samp | |
1156 @item %v | |
1157 Replaced with the buffer representation of the @var{type} widget. | |
1158 @item %b | |
1159 Replace with the checkbox. | |
1160 @item %% | |
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1161 Insert a literal @samp{%}. |
428 | 1162 @end table |
1163 | |
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1164 @vindex greedy@r{ keyword} |
428 | 1165 @item :greedy |
434 | 1166 Usually a checklist will only match if the items are in the exact |
428 | 1167 sequence given in the specification. By setting @code{:greedy} to |
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1168 non-@code{nil}, it will allow the items to appear in any sequence. |
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1169 However, if you extract the value they will be in the sequence given |
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1170 in the checklist, i.e.@: the original sequence is forgotten. |
428 | 1171 |
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1172 @vindex button-args@r{ keyword} |
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1173 @item :button-args |
428 | 1174 A list of keywords to pass to the checkboxes. Useful for setting |
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1175 e.g.@: the @samp{:help-echo} for each checkbox. |
428 | 1176 |
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1177 @vindex buttons@r{ keyword} |
428 | 1178 @item :buttons |
1179 The widgets representing the checkboxes. | |
1180 | |
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1181 @vindex children@r{ keyword} |
428 | 1182 @item :children |
1183 The widgets representing each type. | |
1184 | |
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1185 @vindex args@r{ keyword} |
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1186 @item :args |
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1187 The list of types. |
428 | 1188 @end table |
1189 | |
1190 @node editable-list, group, checklist, Basic Types | |
1191 @comment node-name, next, previous, up | |
1192 @subsection The @code{editable-list} Widget | |
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1193 @findex editable-list@r{ widget} |
428 | 1194 |
1195 Syntax: | |
1196 | |
1197 @example | |
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1198 @var{type} ::= (editable-list [@var{keyword} @var{argument}]... @var{type}) |
428 | 1199 @end example |
1200 | |
1201 The value is a list, where each member represents one widget of type | |
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1202 @var{type}. |
428 | 1203 |
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1204 The following extra properties are recognized: |
428 | 1205 |
1206 @table @code | |
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1207 @vindex entry-format@r{ keyword} |
428 | 1208 @item :entry-format |
1209 This string will be inserted for each entry in the list. | |
1210 The following @samp{%} escapes are available: | |
1211 @table @samp | |
1212 @item %v | |
1213 This will be replaced with the buffer representation of the @var{type} | |
1214 widget. | |
1215 @item %i | |
1216 Insert the @b{[INS]} button. | |
1217 @item %d | |
1218 Insert the @b{[DEL]} button. | |
1219 @item %% | |
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1220 Insert a literal @samp{%}. |
428 | 1221 @end table |
1222 | |
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1223 @vindex insert-button-args@r{ keyword} |
428 | 1224 @item :insert-button-args |
1225 A list of keyword arguments to pass to the insert buttons. | |
1226 | |
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1227 @vindex delete-button-args@r{ keyword} |
428 | 1228 @item :delete-button-args |
1229 A list of keyword arguments to pass to the delete buttons. | |
1230 | |
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1231 @vindex append-button-args@r{ keyword} |
428 | 1232 @item :append-button-args |
1233 A list of keyword arguments to pass to the trailing insert button. | |
1234 | |
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1235 @vindex buttons@r{ keyword} |
428 | 1236 @item :buttons |
1237 The widgets representing the insert and delete buttons. | |
1238 | |
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1239 @vindex children@r{ keyword} |
428 | 1240 @item :children |
1241 The widgets representing the elements of the list. | |
1242 | |
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1243 @vindex args@r{ keyword} |
428 | 1244 @item :args |
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1245 List whose @sc{car} is the type of the list elements. |
428 | 1246 @end table |
1247 | |
1248 @node group, , editable-list, Basic Types | |
1249 @comment node-name, next, previous, up | |
1250 @subsection The @code{group} Widget | |
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1251 @findex group@r{ widget} |
428 | 1252 |
904 | 1253 This widget simply groups other widgets together. |
428 | 1254 |
1255 Syntax: | |
1256 | |
1257 @example | |
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1258 @var{type} ::= (group [@var{keyword} @var{argument}]... @var{type}...) |
428 | 1259 @end example |
1260 | |
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1261 The value is a list, with one member for each @var{type}. |
428 | 1262 |
1263 @node Sexp Types, Widget Properties, Basic Types, Top | |
1264 @comment | |
1265 @section Sexp Types | |
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1266 @cindex sexp types |
428 | 1267 |
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1268 A number of widgets for editing @dfn{s-expressions} (Lisp types), sexp |
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1269 for short, are also available. These basically fall in several |
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1270 categories described in this section. |
428 | 1271 |
1272 @menu | |
1273 * constants:: | |
1274 * generic:: | |
1275 * atoms:: | |
1276 * composite:: | |
1277 @end menu | |
1278 | |
1279 @node constants, generic, Sexp Types, Sexp Types | |
1280 @comment node-name, next, previous, up | |
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1281 @subsection The Constant Widgets |
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1282 @cindex constant widgets |
428 | 1283 |
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1284 The @code{const} widget can contain any Lisp expression, but the user is |
785 | 1285 prohibited from editing it, which is mainly useful as a component of one |
1286 of the composite widgets. | |
428 | 1287 |
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1288 The syntax for the @code{const} widget is: |
428 | 1289 |
1290 @example | |
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1291 @var{type} ::= (const [@var{keyword} @var{argument}]... [ @var{value} ]) |
428 | 1292 @end example |
1293 | |
1294 The @var{value}, if present, is used to initialize the @code{:value} | |
1295 property and can be any s-expression. | |
1296 | |
1297 @deffn Widget const | |
1298 This will display any valid s-expression in an immutable part of the | |
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1299 buffer. |
428 | 1300 @end deffn |
1301 | |
1302 There are two variations of the @code{const} widget, namely | |
1303 @code{variable-item} and @code{function-item}. These should contain a | |
1304 symbol with a variable or function binding. The major difference from | |
1305 the @code{const} widget is that they will allow the user to see the | |
1306 variable or function documentation for the symbol. | |
1307 | |
1308 @deffn Widget variable-item | |
1309 An immutable symbol that is bound as a variable. | |
1310 @end deffn | |
1311 | |
1312 @deffn Widget function-item | |
1313 An immutable symbol that is bound as a function. | |
1314 @end deffn | |
1315 | |
1316 @node generic, atoms, constants, Sexp Types | |
1317 @comment node-name, next, previous, up | |
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1318 @subsection Generic Sexp Widget |
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1319 @cindex generic sexp widget |
428 | 1320 |
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1321 The @code{sexp} widget can contain any Lisp expression, and allows the |
428 | 1322 user to edit it inline in the buffer. |
1323 | |
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1324 The syntax for the @code{sexp} widget is: |
428 | 1325 |
1326 @example | |
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1327 @var{type} ::= (sexp [@var{keyword} @var{argument}]... [ @var{value} ]) |
428 | 1328 @end example |
1329 | |
1330 @deffn Widget sexp | |
1331 This will allow you to edit any valid s-expression in an editable buffer | |
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1332 field. |
428 | 1333 |
1334 The @code{sexp} widget takes the same keyword arguments as the | |
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1335 @code{editable-field} widget. @xref{editable-field}. |
428 | 1336 @end deffn |
1337 | |
1338 @node atoms, composite, generic, Sexp Types | |
1339 @comment node-name, next, previous, up | |
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1340 @subsection Atomic Sexp Widgets |
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1341 @cindex atomic sexp widget |
428 | 1342 |
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1343 The atoms are s-expressions that do not consist of other s-expressions. |
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1344 For example, a string, a file name, or a symbol are atoms, while a list |
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1345 is a composite type. You can edit the value of an atom with the |
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1346 following widgets. |
428 | 1347 |
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1348 The syntax for all the atoms are: |
428 | 1349 |
1350 @example | |
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1351 @var{type} ::= (@var{construct} [@var{keyword} @var{argument}]... [ @var{value} ]) |
428 | 1352 @end example |
1353 | |
1354 The @var{value}, if present, is used to initialize the @code{:value} | |
1355 property and must be an expression of the same type as the widget. | |
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1356 That is, the string widget can only be initialized with a string. |
428 | 1357 |
1358 All the atom widgets take the same keyword arguments as the | |
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1359 @code{editable-field} widget. @xref{editable-field}. |
428 | 1360 |
1361 @deffn Widget string | |
1362 Allows you to edit a string in an editable field. | |
1363 @end deffn | |
1364 | |
1365 @deffn Widget regexp | |
1366 Allows you to edit a regular expression in an editable field. | |
1367 @end deffn | |
1368 | |
1369 @deffn Widget character | |
1370 Allows you to enter a character in an editable field. | |
1371 @end deffn | |
1372 | |
1373 @deffn Widget file | |
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1374 Allows you to edit a file name in an editable field. |
428 | 1375 |
1376 Keywords: | |
1377 @table @code | |
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1378 @vindex must-match@r{ keyword} |
428 | 1379 @item :must-match |
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1380 If this is set to non-@code{nil}, only existing file names will be |
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1381 allowed in the minibuffer. |
428 | 1382 @end table |
1383 @end deffn | |
1384 | |
1385 @deffn Widget directory | |
1386 Allows you to edit a directory name in an editable field. | |
1387 Similar to the @code{file} widget. | |
1388 @end deffn | |
1389 | |
1390 @deffn Widget symbol | |
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1391 Allows you to edit a Lisp symbol in an editable field. |
428 | 1392 @end deffn |
1393 | |
1394 @deffn Widget function | |
1395 Allows you to edit a lambda expression, or a function name with completion. | |
1396 @end deffn | |
1397 | |
1398 @deffn Widget variable | |
1399 Allows you to edit a variable name, with completion. | |
1400 @end deffn | |
1401 | |
1402 @deffn Widget integer | |
1403 Allows you to edit an integer in an editable field. | |
1404 @end deffn | |
1405 | |
1406 @deffn Widget number | |
1407 Allows you to edit a number in an editable field. | |
1408 @end deffn | |
1409 | |
1410 @deffn Widget boolean | |
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1411 Allows you to edit a boolean. In Lisp this means a variable which is |
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1412 either @code{nil} meaning false, or non-@code{nil} meaning true. |
428 | 1413 @end deffn |
1414 | |
1415 | |
1416 @node composite, , atoms, Sexp Types | |
1417 @comment node-name, next, previous, up | |
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1418 @subsection Composite Sexp Widgets |
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1419 @cindex composite sexp widgets |
428 | 1420 |
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1421 The syntax for the composite widget construct is: |
428 | 1422 |
1423 @example | |
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1424 @var{type} ::= (@var{construct} [@var{keyword} @var{argument}]... @var{component}...) |
428 | 1425 @end example |
1426 | |
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1427 @noindent |
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1428 where each @var{component} must be a widget type. Each component widget |
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1429 will be displayed in the buffer, and will be editable by the user. |
428 | 1430 |
1431 @deffn Widget cons | |
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1432 The value of a @code{cons} widget must be a cons-cell whose @sc{car} |
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1433 and @sc{cdr} have two specified types. It uses this syntax: |
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1434 |
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1435 @example |
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1436 @var{type} ::= (cons [@var{keyword} @var{argument}]... @var{car-type} @var{cdr-type}) |
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1437 @end example |
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1438 @end deffn |
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1439 |
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1440 @deffn Widget choice |
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1441 The value matched by a @code{choice} widget must have one of a fixed |
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1442 set of types. The widget's syntax is as follows: |
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1443 |
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1444 @example |
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1445 @var{type} ::= (choice [@var{keyword} @var{argument}]... @var{type} ... ) |
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1446 @end example |
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1447 |
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1448 The value of a @code{choice} widget can be anything that matches any of the |
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1449 @var{types}. |
428 | 1450 @end deffn |
1451 | |
1452 @deffn Widget list | |
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1453 The value of a @code{list} widget must be a list whose element types |
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1454 match the specified component types: |
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1455 |
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1456 @example |
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1457 @var{type} ::= (list [@var{keyword} @var{argument}]... @var{component-type}...) |
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1458 @end example |
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1459 |
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1460 Thus, @code{(list string number)} matches lists of two elements, |
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1461 the first being a string and the second being a number. |
428 | 1462 @end deffn |
1463 | |
1464 @deffn Widget vector | |
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1465 The @code{vector} widget is like the @code{list} widget but matches |
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1466 vectors instead of lists. Thus, @code{(vector string number)} matches |
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1467 vectors of two elements, the first being a string and the second being |
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1468 a number. |
428 | 1469 @end deffn |
1470 | |
1471 The above suffice for specifying fixed size lists and vectors. To get | |
1472 variable length lists and vectors, you can use a @code{choice}, | |
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1473 @code{set}, or @code{repeat} widget together with the @code{:inline} |
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1474 keyword. If any component of a composite widget has the |
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1475 @code{:inline} keyword set, its value must be a list which will then |
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1476 be spliced into the composite. For example, to specify a list whose |
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1477 first element must be a file name, and whose remaining elements should |
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1478 either be the symbol @code{t} or two strings (file names), you can use |
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1479 the following widget specification: |
428 | 1480 |
1481 @example | |
1482 (list file | |
1483 (choice (const t) | |
1484 (list :inline t | |
1485 :value ("foo" "bar") | |
1486 string string))) | |
1487 @end example | |
1488 | |
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1489 The value of a widget of this type will either have the form |
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1490 @code{(file t)} or @code{(file @var{string} @var{string})}. |
428 | 1491 |
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1492 This concept of @code{:inline} may be hard to understand. It was |
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1493 certainly hard to implement, so instead of confusing you more by |
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1494 trying to explain it here, I'll just suggest you meditate over it for |
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1495 a while. |
428 | 1496 |
1497 @deffn Widget set | |
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1498 Specifies a type whose values are the lists whose elements all belong |
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1499 to a given set. The order of elements of the list is not significant. |
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1500 Here's the syntax: |
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1501 |
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1502 @example |
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1503 @var{type} ::= (set [@var{keyword} @var{argument}]... @var{permitted-element} ... ) |
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1504 @end example |
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1505 |
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1506 Use @code{const} to specify each permitted element, like this: |
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1507 @code{(set (const a) (const b))}. |
428 | 1508 @end deffn |
1509 | |
1510 @deffn Widget repeat | |
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1511 Specifies a list of any number of elements that fit a certain type. |
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1512 |
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1513 @example |
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1514 @var{type} ::= (repeat [@var{keyword} @var{argument}]... @var{type}) |
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1515 @end example |
428 | 1516 @end deffn |
1517 | |
1518 @node Widget Properties, Defining New Widgets, Sexp Types, Top | |
1519 @comment node-name, next, previous, up | |
1520 @section Properties | |
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1521 @cindex properties of widgets |
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1522 @cindex widget properties |
428 | 1523 |
1524 You can examine or set the value of a widget by using the widget object | |
1525 that was returned by @code{widget-create}. | |
1526 | |
1527 @defun widget-value widget | |
1528 Return the current value contained in @var{widget}. | |
1529 It is an error to call this function on an uninitialized widget. | |
1530 @end defun | |
1531 | |
1532 @defun widget-value-set widget value | |
1533 Set the value contained in @var{widget} to @var{value}. | |
1534 It is an error to call this function with an invalid @var{value}. | |
1535 @end defun | |
1536 | |
1537 @strong{Important:} You @emph{must} call @code{widget-setup} after | |
1538 modifying the value of a widget before the user is allowed to edit the | |
1539 widget again. It is enough to call @code{widget-setup} once if you | |
1540 modify multiple widgets. This is currently only necessary if the widget | |
1541 contains an editing field, but may be necessary for other widgets in the | |
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1542 future. |
428 | 1543 |
1544 If your application needs to associate some information with the widget | |
1545 objects, for example a reference to the item being edited, it can be | |
1546 done with @code{widget-put} and @code{widget-get}. The property names | |
1547 must begin with a @samp{:}. | |
1548 | |
1549 @defun widget-put widget property value | |
1550 In @var{widget} set @var{property} to @var{value}. | |
1551 @var{property} should be a symbol, while @var{value} can be anything. | |
1552 @end defun | |
1553 | |
1554 @defun widget-get widget property | |
1555 In @var{widget} return the value for @var{property}. | |
1556 @var{property} should be a symbol, the value is what was last set by | |
1557 @code{widget-put} for @var{property}. | |
1558 @end defun | |
1559 | |
1560 @defun widget-member widget property | |
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1561 Non-@code{nil} if @var{widget} has a value (even @code{nil}) for |
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1562 property @var{property}. |
428 | 1563 @end defun |
1564 | |
1565 Occasionally it can be useful to know which kind of widget you have, | |
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1566 i.e.@: the name of the widget type you gave when the widget was created. |
428 | 1567 |
1568 @defun widget-type widget | |
1569 Return the name of @var{widget}, a symbol. | |
1570 @end defun | |
1571 | |
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1572 @cindex active widget |
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1573 @cindex inactive widget |
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1574 @cindex activate a widget |
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1575 @cindex deactivate a widget |
428 | 1576 Widgets can be in two states: active, which means they are modifiable by |
1577 the user, or inactive, which means they cannot be modified by the user. | |
1578 You can query or set the state with the following code: | |
1579 | |
1580 @lisp | |
1581 ;; Examine if @var{widget} is active or not. | |
1582 (if (widget-apply @var{widget} :active) | |
1583 (message "Widget is active.") | |
1584 (message "Widget is inactive.") | |
1585 | |
1586 ;; Make @var{widget} inactive. | |
1587 (widget-apply @var{widget} :deactivate) | |
1588 | |
1589 ;; Make @var{widget} active. | |
1590 (widget-apply @var{widget} :activate) | |
1591 @end lisp | |
1592 | |
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1593 A widget is inactive if it, or any of its ancestors (found by |
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1594 following the @code{:parent} link), have been deactivated. To make sure |
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1595 a widget is really active, you must therefore activate both it and |
428 | 1596 all its ancestors. |
1597 | |
1598 @lisp | |
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1599 (while widget |
428 | 1600 (widget-apply widget :activate) |
1601 (setq widget (widget-get widget :parent))) | |
1602 @end lisp | |
1603 | |
1604 You can check if a widget has been made inactive by examining the value | |
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1605 of the @code{:inactive} keyword. If this is non-@code{nil}, the widget itself |
434 | 1606 has been deactivated. This is different from using the @code{:active} |
1607 keyword, in that the latter tells you if the widget @strong{or} any of | |
1608 its ancestors have been deactivated. Do not attempt to set the | |
428 | 1609 @code{:inactive} keyword directly. Use the @code{:activate} |
434 | 1610 @code{:deactivate} keywords instead. |
428 | 1611 |
1612 | |
1613 @node Defining New Widgets, Widget Browser, Widget Properties, Top | |
1614 @comment node-name, next, previous, up | |
1615 @section Defining New Widgets | |
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1616 @cindex new widgets |
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1617 @cindex defining new widgets |
428 | 1618 |
1619 You can define specialized widgets with @code{define-widget}. It allows | |
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1620 you to create a shorthand for more complex widgets, including specifying |
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1621 component widgets and new default values for the keyword |
434 | 1622 arguments. |
428 | 1623 |
1183 | 1624 @defun define-widget name class doc &rest args |
428 | 1625 Define a new widget type named @var{name} from @code{class}. |
1626 | |
1627 @var{name} and class should both be symbols, @code{class} should be one | |
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1628 of the existing widget types. |
428 | 1629 |
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1630 The third argument @var{doc} is a documentation string for the widget. |
428 | 1631 |
434 | 1632 After the new widget has been defined the following two calls will |
428 | 1633 create identical widgets: |
1634 | |
1635 @itemize @bullet | |
1636 @item | |
1637 @lisp | |
1638 (widget-create @var{name}) | |
1639 @end lisp | |
1640 | |
1641 @item | |
1642 @lisp | |
1643 (apply widget-create @var{class} @var{args}) | |
1644 @end lisp | |
1645 @end itemize | |
1646 | |
1647 @end defun | |
1648 | |
1183 | 1649 Using @code{define-widget} just stores the definition of the widget type |
434 | 1650 in the @code{widget-type} property of @var{name}, which is what |
428 | 1651 @code{widget-create} uses. |
1652 | |
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1653 If you only want to specify defaults for keywords with no complex |
1339 | 1654 conversions, you can use @code{identity} as your @code{:convert-widget} |
1655 function. | |
428 | 1656 |
1657 The following additional keyword arguments are useful when defining new | |
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1658 widgets: |
428 | 1659 @table @code |
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1660 @vindex convert-widget@r{ keyword} |
428 | 1661 @item :convert-widget |
1339 | 1662 Method to convert type-specific components of a widget type before |
1663 instantiating a widget of that type. Not normally called from user | |
1664 code, it is invoked by @code{widget-convert}. Typical operations | |
1665 include converting types of child widgets to widget instances and | |
1666 converting values from external format (@emph{i.e.}, as expected by the | |
1667 calling code) to internal format (which is often different for the | |
1668 convenience of widget manipulation). It takes a widget type as an | |
1669 argument, and returns the converted widget type. When a widget is | |
1670 created, the value of this property is called for the widget type, then | |
1671 for all the widget's parent types, most derived first. (The property is | |
1672 reevaluated for each parent type.) | |
428 | 1673 |
1674 The following predefined functions can be used here: | |
1675 | |
1676 @defun widget-types-convert-widget widget | |
1339 | 1677 Convert each member of @code{:args} in @var{widget} from a widget type |
1678 to a widget. | |
428 | 1679 @end defun |
1680 | |
1681 @defun widget-value-convert-widget widget | |
1339 | 1682 Initialize @code{:value} from @code{(car :args)} in @var{widget}, and |
1683 reset @code{:args}. | |
428 | 1684 @end defun |
1685 | |
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1686 @vindex copy@r{ keyword} |
1339 | 1687 @item :copy |
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1688 Function to deep copy a widget type. It takes a shallow copy of the |
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1689 widget type as an argument (made by @code{copy-sequence}), and returns a |
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1690 deep copy. The purpose of this is to avoid having different instances |
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1691 of combined widgets share nested attributes. Any member of the |
1339 | 1692 widget which might be changed in place (rather than replaced) should be |
1693 copied by this method. (@code{widget-copy} uses @code{copy-sequence} to | |
1694 ensure that the top-level list is a copy.) This particularly applies to | |
1695 child widgets. | |
1696 | |
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1697 The following predefined functions can be used here: |
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1698 |
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1699 @defun widget-types-copy widget |
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1700 Copy @code{:args} as widget types in @var{widget}. |
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1701 @end defun |
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1702 |
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1703 @vindex value-to-internal@r{ keyword} |
428 | 1704 @item :value-to-internal |
1705 Function to convert the value to the internal format. The function | |
434 | 1706 takes two arguments, a widget and an external value. It returns the |
428 | 1707 internal value. The function is called on the present @code{:value} |
1708 when the widget is created, and on any value set later with | |
1709 @code{widget-value-set}. | |
1710 | |
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1711 @vindex value-to-external@r{ keyword} |
428 | 1712 @item :value-to-external |
1713 Function to convert the value to the external format. The function | |
1714 takes two arguments, a widget and an internal value, and returns the | |
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1715 external value. The function is called on the present @code{:value} |
428 | 1716 when the widget is created, and on any value set later with |
1717 @code{widget-value-set}. | |
1718 | |
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1719 @vindex create@r{ keyword} |
428 | 1720 @item :create |
1721 Function to create a widget from scratch. The function takes one | |
1339 | 1722 argument, a widget, and inserts it in the buffer. Not normally called |
1723 from user code. Instead, call @code{widget-create} or related | |
1724 functions, which take a type argument, (usually) convert it to a widget, | |
1725 call the @code{:create} function to insert it in the buffer, and then | |
1726 return the (possibly converted) widget. | |
1727 | |
1728 The default, @code{widget-default-create}, is invariably appropriate. | |
1729 (None of the standard widgets specify @code{:create}.) | |
428 | 1730 |
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1731 @vindex delete@r{ keyword} |
428 | 1732 @item :delete |
1733 Function to delete a widget. The function takes one argument, a widget, | |
1734 and should remove all traces of the widget from the buffer. | |
1735 | |
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1736 The default value is: |
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1737 |
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1738 @defun widget-default-delete widget |
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1739 Remove @var{widget} from the buffer. |
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1740 Delete all @code{:children} and @code{:buttons} in @var{widget}. |
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1741 @end defun |
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1742 |
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1743 In most cases you should not change this value, but instead use |
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1744 @code{:value-delete} to make any additional cleanup. |
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1745 |
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1746 @vindex value-create@r{ keyword} |
428 | 1747 @item :value-create |
1748 Function to expand the @samp{%v} escape in the format string. It will | |
434 | 1749 be called with the widget as its argument and should insert a |
1750 representation of the widget's value in the buffer. | |
428 | 1751 |
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1752 Nested widgets should be listed in @code{:children} or @code{:buttons} |
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1753 to make sure they are automatically deleted. |
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1754 |
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1755 @vindex value-delete@r{ keyword} |
428 | 1756 @item :value-delete |
434 | 1757 Should remove the representation of the widget's value from the buffer. |
428 | 1758 It will be called with the widget as its argument. It doesn't have to |
1759 remove the text, but it should release markers and delete nested widgets | |
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1760 if these are not listed in @code{:children} or @code{:buttons}. |
428 | 1761 |
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1762 @vindex value-get@r{ keyword} |
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1763 @item :value-get |
428 | 1764 Function to extract the value of a widget, as it is displayed in the |
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1765 buffer. |
428 | 1766 |
1767 The following predefined function can be used here: | |
1768 | |
1769 @defun widget-value-value-get widget | |
1770 Return the @code{:value} property of @var{widget}. | |
1771 @end defun | |
1772 | |
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1773 @vindex format-handler@r{ keyword} |
428 | 1774 @item :format-handler |
1775 Function to handle unknown @samp{%} escapes in the format string. It | |
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1776 will be called with the widget and the character that follows the |
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1777 @samp{%} as arguments. You can set this to allow your widget to handle |
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1778 non-standard escapes. |
428 | 1779 |
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1780 @findex widget-default-format-handler |
428 | 1781 You should end up calling @code{widget-default-format-handler} to handle |
434 | 1782 unknown escape sequences. It will handle the @samp{%h} and any future |
1783 escape sequences as well as give an error for unknown escapes. | |
428 | 1784 |
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1785 @vindex action@r{ keyword} |
428 | 1786 @item :action |
1787 Function to handle user initiated events. By default, @code{:notify} | |
652 | 1788 the parent. Actions normally do not include mere edits, but refer to |
1789 things like invoking buttons or hitting enter in an editable field. To | |
1790 watch for any change, redefine the @code{:notify} callback. | |
428 | 1791 |
1792 The following predefined function can be used here: | |
1793 | |
1794 @defun widget-parent-action widget &optional event | |
1795 Tell @code{:parent} of @var{widget} to handle the @code{:action}.@* | |
1796 Optional @var{event} is the event that triggered the action. | |
1797 @end defun | |
1798 | |
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1799 @vindex prompt-value@r{ keyword} |
428 | 1800 @item :prompt-value |
1801 Function to prompt for a value in the minibuffer. The function should | |
1802 take four arguments, @var{widget}, @var{prompt}, @var{value}, and | |
1803 @var{unbound} and should return a value for widget entered by the user. | |
1804 @var{prompt} is the prompt to use. @var{value} is the default value to | |
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1805 use, unless @var{unbound} is non-@code{nil}, in which case there is no default |
428 | 1806 value. The function should read the value using the method most natural |
434 | 1807 for this widget and does not have to check whether it matches. |
428 | 1808 @end table |
1809 | |
1810 If you want to define a new widget from scratch, use the @code{default} | |
1811 widget as its base. | |
1812 | |
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1813 @deffn Widget default |
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1814 Widget used as a base for other widgets. |
428 | 1815 |
1816 It provides most of the functionality that is referred to as ``by | |
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1817 default'' in this text. |
428 | 1818 @end deffn |
1819 | |
1339 | 1820 In implementing complex hierarchical widgets (@emph{e.g.}, using the |
1821 @samp{group} widget), the following functions may be useful. | |
1822 The syntax for the @var{type} arguments to these functions is described | |
1823 in @ref{Basic Types}. | |
1824 | |
1825 @defun widget-create-child-and-convert parent type &rest args | |
1826 As a child of @var{parent}, create a widget with type @var{type} and | |
4312 | 1827 value @var{value}. @var{type} is copied, and the @code{:widget-convert} |
1339 | 1828 method is applied to the optional keyword arguments from @var{args}. |
1829 @end defun | |
1830 | |
1831 @defun widget-create-child parent type | |
1832 As a child of @var{parent}, create a widget with type @var{type}. | |
1347 | 1833 @var{type} is copied, but no conversion method is applied. |
1339 | 1834 @end defun |
1835 | |
1836 @defun widget-create-child-value parent type value | |
1837 As a child of @var{parent}, create a widget with type @var{type} and | |
1347 | 1838 value @var{value}. @var{type} is copied, but no conversion method is |
1339 | 1839 applied. |
1840 @end defun | |
1841 | |
1842 @defun widget-convert type &rest args | |
1843 Convert @var{type} to a widget without inserting it in the buffer. | |
1844 The optional @var{args} are additional keyword arguments. | |
1845 | |
1846 The widget's @code{:args} property is set from the longest tail of | |
1847 @var{args} whose @samp{cdr} is not a keyword, or if that is null, from | |
1848 the longest tail of @var{type}'s @code{:args} property whose cdr is not | |
1849 a keyword. Keyword arguments from @var{args} are set, and the | |
1850 @code{:value} property (if any) is converted from external to internal | |
1851 format. | |
1852 @end defun | |
1853 | |
1854 @code{widget-convert} is typically not called from user code; rather it | |
1855 is called implicitly through the @samp{widget-create*} functions. | |
1856 | |
428 | 1857 @node Widget Browser, Widget Minor Mode, Defining New Widgets, Top |
1858 @comment node-name, next, previous, up | |
1859 @section Widget Browser | |
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1860 @cindex widget browser |
428 | 1861 |
1862 There is a separate package to browse widgets. This is intended to help | |
1863 programmers who want to examine the content of a widget. The browser | |
1864 shows the value of each keyword, but uses links for certain keywords | |
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1865 such as @samp{:parent}, which avoids printing cyclic structures. |
428 | 1866 |
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1867 @deffn Command widget-browse @var{widget} |
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1868 Create a widget browser for @var{widget}. |
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1869 When called interactively, prompt for @var{widget}. |
428 | 1870 @end deffn |
1871 | |
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1872 @deffn Command widget-browse-other-window @var{widget} |
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1873 Create a widget browser for @var{widget} and show it in another window. |
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1874 When called interactively, prompt for @var{widget}. |
428 | 1875 @end deffn |
1876 | |
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1877 @deffn Command widget-browse-at @var{pos} |
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1878 Create a widget browser for the widget at @var{pos}. |
428 | 1879 When called interactively, use the position of point. |
1880 @end deffn | |
1881 | |
1882 @node Widget Minor Mode, Utilities, Widget Browser, Top | |
1883 @comment node-name, next, previous, up | |
1884 @section Widget Minor Mode | |
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1885 @cindex widget minor mode |
428 | 1886 |
1887 There is a minor mode for manipulating widgets in major modes that | |
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1888 don't provide any support for widgets themselves. This is mostly |
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1889 intended to be useful for programmers doing experiments. |
428 | 1890 |
1891 @deffn Command widget-minor-mode | |
1892 Toggle minor mode for traversing widgets. | |
1893 With arg, turn widget mode on if and only if arg is positive. | |
1894 @end deffn | |
1895 | |
1896 @defvar widget-minor-mode-keymap | |
1897 Keymap used in @code{widget-minor-mode}. | |
1898 @end defvar | |
1899 | |
1900 @node Utilities, Widget Wishlist, Widget Minor Mode, Top | |
1901 @comment node-name, next, previous, up | |
1902 @section Utilities. | |
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1903 @cindex utility functions for widgets |
428 | 1904 |
1905 @defun widget-prompt-value widget prompt [ value unbound ] | |
1906 Prompt for a value matching @var{widget}, using @var{prompt}.@* | |
1907 The current value is assumed to be @var{value}, unless @var{unbound} is | |
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1908 non-@code{nil}.@refill |
428 | 1909 @end defun |
1910 | |
1911 @defun widget-get-sibling widget | |
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1912 Get the item which @var{widget} is assumed to toggle.@* |
428 | 1913 This is only meaningful for radio buttons or checkboxes in a list. |
1914 @end defun | |
1915 | |
1183 | 1916 @node Widget Wishlist, Widget Internals, Utilities, Top |
428 | 1917 @comment node-name, next, previous, up |
1918 @section Wishlist | |
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1919 @cindex todo |
428 | 1920 |
1921 @itemize @bullet | |
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1922 @item |
428 | 1923 It should be possible to add or remove items from a list with @kbd{C-k} |
1924 and @kbd{C-o} (suggested by @sc{rms}). | |
1925 | |
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1926 @item |
428 | 1927 The @samp{[INS]} and @samp{[DEL]} buttons should be replaced by a single |
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1928 dash (@samp{-}). The dash should be a button that, when invoked, asks |
428 | 1929 whether you want to add or delete an item (@sc{rms} wanted to git rid of |
1930 the ugly buttons, the dash is my idea). | |
1931 | |
1932 @item | |
1933 The @code{menu-choice} tag should be prettier, something like the abbreviated | |
1934 menus in Open Look. | |
1935 | |
1936 @item | |
1937 Finish @code{:tab-order}. | |
1938 | |
1939 @item | |
1940 Make indentation work with glyphs and proportional fonts. | |
1941 | |
1942 @item | |
1943 Add commands to show overview of object and class hierarchies to the | |
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1944 browser. |
428 | 1945 |
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1946 @item |
428 | 1947 Find a way to disable mouse highlight for inactive widgets. |
1948 | |
1949 @item | |
1950 Find a way to make glyphs look inactive. | |
1951 | |
1952 @item | |
1953 Add @code{property-list} widget. | |
1954 | |
1955 @item | |
1956 Add @code{association-list} widget. | |
1957 | |
1958 @item | |
1959 Add @code{key-binding} widget. | |
1960 | |
1961 @item | |
1962 Add @code{widget} widget for editing widget specifications. | |
1963 | |
1964 @item | |
1965 Find clean way to implement variable length list. | |
1966 See @code{TeX-printer-list} for an explanation. | |
1967 | |
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1968 @item |
428 | 1969 @kbd{C-h} in @code{widget-prompt-value} should give type specific help. |
1970 | |
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1971 @item |
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1972 Add a @code{mailto} widget. |
428 | 1973 |
1974 @item | |
1975 @kbd{C-e e} in a fixed size field should go to the end of the text in | |
1976 the field, not the end of the field itself. | |
1977 | |
1978 @item | |
1183 | 1979 Use an overlay instead of markers to delimit the widget. Create |
428 | 1980 accessors for the end points. |
1981 | |
1982 @item | |
1983 Clicking on documentation links should call @code{describe-function} or | |
1984 @code{widget-browse-other-window} and friends directly, instead of going | |
1985 through @code{apropos}. If more than one function is valid for the | |
1986 symbol, it should pop up a menu. | |
1987 @end itemize | |
1988 | |
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1989 @node Widget Internals, GNU Free Documentation License, Widget Wishlist, Top |
1183 | 1990 @section Internals |
1991 | |
1992 This (very brief!) section provides a few notes on the internal | |
1993 structure and implementation of Emacs widgets. Avoid relying on this | |
1994 information. (We intend to improve it, but this will take some time.) | |
1995 To the extent that it actually describes APIs, the information will be | |
1996 moved to appropriate sections of the manual in due course. | |
1997 | |
1998 @subsection The @dfn{Widget} and @dfn{Type} Structures | |
1999 | |
2000 Widgets and types are currently both implemented as lists. | |
2001 | |
2002 A symbol may be defined as a @dfn{type name} using @code{define-widget}. | |
2003 @xref{Defining New Widgets}. A @dfn{type} is a list whose car is a | |
2004 previously defined type name, nil, or (recursively) a type. The car is | |
2005 the @dfn{class} or parent type of the type, and properties which are not | |
2006 specified in the new type will be inherited from ancestors. Probably | |
2007 the only type without a class should be the @code{default} type. The | |
2008 cdr of a type is a plist whose keys are widget property keywords. | |
2009 | |
2010 A type or type name may also be referred to as an @dfn{unconverted | |
2011 widget}. | |
2012 | |
2013 A @dfn{converted widget} or @dfn{widget instance} is a list whose car is | |
2014 a type name or a type, and whose cdr is a property list. Furthermore, | |
2015 all children of the converted widget must be converted. Finally, in the | |
2016 process of appropriate parts of the list structure are copied to ensure | |
2017 that changes in values of one instance do not affect another's. | |
2018 | |
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2019 @node GNU Free Documentation License, Index, Widget Internals, Top |
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2020 @appendix GNU Free Documentation License |
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2021 @include doclicense.texi |
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2022 |
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2023 @node Index, , GNU Free Documentation License, Top |
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2024 @comment node-name, next, previous, up |
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2025 @unnumbered Index |
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2026 |
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2027 This is an alphabetical listing of all concepts, functions, commands, |
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2028 variables, and widgets described in this manual. |
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2029 @printindex cp |
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2030 |
428 | 2031 @bye |
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2032 |
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2033 @ignore |
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2034 arch-tag: 2b427731-4c61-4e72-85de-5ccec9c623f0 |
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2035 @end ignore |