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1// Copyright (C) 2020 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
3
4/*!
5 \page 03-qdoc-commands-markup.html
6 \previouspage Naming Things
7 \nextpage Macros
8
9 \title Markup Commands
10
11 The markup commands indicate the generated documentation's visual
12 appearance and logical structure.
13
14 \list
15 \li \l {a-command} {\\a}
16 \li \l {annotatedlist-command} {\\annotatedlist}
17 \li \l {b-command} {\\b}
18 \li \l {badcode-command} {\\badcode}
19 \li \l {b-command} {\\bold} (deprecated, use \\b)
20 \li \l {br-command} {\\br}
21 \li \l {brief-command} {\\brief}
22 \li \l {c-command} {\\c}
23 \li \l {caption-command} {\\caption}
24 \li \l {code-command} {\\code}
25 \li \l {codeline-command} {\\codeline}
26 \li \l {details-command} {\\details}
27 \li \l {div-command} {\\div}
28 \li \l {dots-command} {\\dots}
29 \li \l {e-command} {\\e}
30 \li \l {else-command} {\\else}
31 \li \l {endif-command} {\\endif}
32 \li \l {generatelist-command} {\\generatelist}
33 \li \l {header-command} {\\header}
34 \li \l {e-command} {\\i} (deprecated, use \\e)
35 \li \l {if-command} {\\if}
36 \li \l {image-command} {\\image}
37 \li \l {include-command} {\\include}
38 \li \l {inlineimage-command} {\\inlineimage}
39 \li \l {keyword-command} {\\keyword}
40 \li \l {l-command} {\\l}
41 \li \l {legalese-command} {\\legalese}
42 \li \l {li-command} {\\li}
43 \li \l {list-command} {\\list}
44 \li \l {meta-command} {\\meta}
45 \li \l {noautolist-command} {\\noautolist}
46 \li \l {li-command} {\\o} (deprecated, use \\li)
47 \li \l {note-command} {\\note}
48 \li \l {notranslate-command} {\\notranslate}
49 \li \l {omit-command} {\\omit}
50 \li \l {printline-command} {\\printline}
51 \li \l {printto-command} {\\printto}
52 \li \l {printuntil-command} {\\printuntil}
53 \li \l {qml-command}{\\qml}
54 \li \l {quotation-command} {\\quotation}
55 \li \l {quotefile-command} {\\quotefile}
56 \li \l {quotefromfile-command} {\\quotefromfile}
57 \li \l {raw-command} {\\raw}
58 \li \l {row-command} {\\row}
59 \li \l {sa-command} {\\sa}
60 \li \l {sectionOne-command} {\\section1}
61 \li \l {sectionTwo-command} {\\section2}
62 \li \l {sectionThree-command} {\\section3}
63 \li \l {sectionFour-command} {\\section4}
64 \li \l {sincelist-command} {\\sincelist}
65 \li \l {skipline-command} {\\skipline}
66 \li \l {skipto-command} {\\skipto}
67 \li \l {skipuntil-command} {\\skipuntil}
68 \li \l {snippet-command} {\\snippet}
69 \li \l {span-command} {\\span}
70 \li \l {sub-command} {\\sub}
71 \li \l {sup-command} {\\sup}
72 \li \l {table-command} {\\table}
73 \li \l {target-command} {\\target}
74 \li \qdoccmd tm
75 \li \l {tt-command} {\\tt}
76 \li \l {uicontrol-command} {\\uicontrol}
77 \li \l {underline-command} {\\underline}
78 \li \l {raw-command} {\\unicode}
79 \li \l {warning-command} {\\warning}
80 \li \l {backslash-sequence} {\\\\}
81 \li \l {endash-sequence} {\--}
82 \li \l {emdash-sequence} {-\--}
83 \endlist
84*/
85
86
87/*!
88 \page 04-qdoc-commands-textmarkup.html
89 \previouspage Markup Commands
90 \nextpage Document Structure
91
92 \title Text Markup
93
94 The text formatting commands indicate how text is to be rendered.
95
96 \target a-command
97 \section1 \\a (parameter marker)
98
99 The \\a command tells QDoc the next word is a formal parameter name.
100
101 A warning is emitted when a formal parameter is not documented or
102 is misspelled, so when you document a function you should mention
103 each formal parameter by name in the function description,
104 preceded by the \\a command. The parameter name is then rendered
105 in italics.
106
107 The formal parameter name may be enclosed between curly brackets,
108 but that isn't required.
109
110 \target c-command
111 \section1 \\c (code font)
112
113 The \\c command is used for rendering variable names, user-defined
114 class names, and C++ keywords (for example, \c int and \c for) in the code
115 font.
116
117 The command renders its argument using a monospace font. If the text to be
118 rendered in the code font contains spaces, enclose the entire text in curly
119 brackets:
120
121 \code
122 \c {QLineEdit::QLineEdit(const QString &contents, QWidget *parent) : QWidget(parent)}
123 \endcode
124
125 The \\c command accepts the special character \c \ within its
126 argument, which renders it as a normal character. So if you want
127 to use nested commands, you must use the \l {tt-command} {teletype
128 (\\tt)} command instead.
129
130 See also \l {tt-command} {\\tt} and \l {code-command} {\\code}.
131
132 \target details-command
133 \section1 \\details (collapsible)
134
135 The \\details and \\enddetails commands generates a collapsible <details>
136 element with a <summary> to control the hidden/visible state.
137
138 When generating HTML output, use the \\details and \\enddetails commands to
139 generate a collapsible \c{<details>} HTML element. The command takes an
140 optional summary string enclosed in curly braces. This optional argument
141 specifies a visible heading for the details.
142
143 if the argument is omitted, QDoc outputs \e {"..."} as the summary string.
144
145 For example, with the following input:
146 \code [text] *
147 /\1!
148 \details {QDoc details}
149 \note You're looking at detailed information.
150 \enddetails
151 \1/
152 \endcode
153
154 If QDoc is generating HTML, it will translate these commands to:
155
156 \code [text]
157 <details>
158 <summary>QDoc details</summary>
159 <div class="admonition note">
160 <p><b>Note: </b>You're looking at detailed information.</p>
161 </div>
162 </details>
163 \endcode
164
165 QDoc renders this as:
166
167 \details {QDoc details}
168 \note You're looking at detailed information.
169 \enddetails
170
171 For any other output format, QDoc generates the contents as a normal paragraph,
172 ignoring the summary string. This command was introduced to QDoc in Qt6.6.
173
174 \target div-command
175 \section1 \\div
176
177 The \\div and \\enddiv commands delimit a large or small block of
178 text (which may include other QDoc commands) to which special
179 formatting attributes should be applied.
180
181 An argument must be provided in curly braces, as in the QDoc
182 comment shown below. The argument is not interpreted but is used
183 as attribute(s) of the tag that is output by QDoc.
184
185 For example, we might want to render an inline image so that it
186 floats to the right of the current block of text:
187
188 \badcode *
189 /\1!
190 \div {class="float-right"}
191 \inlineimage qml-column.png
192 \enddiv
193 \1/
194 \endcode
195
196 If QDoc is generating HTML, it will translate these commands to:
197
198 \code
199 <div class="float-right"><p><img src="images/qml-column.png" /></p></div>
200 \endcode
201
202 For HTML, the attribute value \e {float-right} then will refer to
203 a clause in the style.css file, which in this case could be:
204
205 \code
206 div.float-right
207 {
208 float: right; margin-left: 2em
209 }
210 \endcode
211
212 \note Note that the \b {\\div} command can be nested.
213
214 Below you can find an example taken from the index.qdoc file used to
215 generate index.html for Qt 4.7:
216
217 \code
218 \div {class="indexbox guide"}
219 \div {class="heading"}
220 Qt Developer Guide
221 \enddiv
222 \div {class="indexboxcont indexboxbar"}
223 \div {class="section indexIcon"} \emptyspan
224 \enddiv
225 \div {class="section"}
226 Qt is a cross-platform application and UI
227 framework. Using Qt, you can write web-enabled
228 applications once and deploy them across desktop,
229 mobile and embedded operating systems without
230 rewriting the source code.
231 \enddiv
232 \div {class="section sectionlist"}
233 \list
234 \li \l{Getting Started}
235 \li \l{Installation} {Installation}
236 \li \l{how-to-learn-qt.html} {How to learn Qt}
237 \li \l{tutorials.html} {Tutorials}
238 \li \l{Qt Examples} {Examples}
239 \li \l{qt4-7-intro.html} {What's new in Qt 4.7}
240 \endlist
241 \enddiv
242 \enddiv
243 \enddiv
244 \endcode
245
246 When all the class attribute values are defined as they are in the
247 style.css file that is used for rendering the Qt documentation,
248 the above example is rendered as:
249
250 \div {class="indexbox guide"}
251 \div {class="heading"}
252 Qt Developer Guide
253 \enddiv
254 \div {class="indexboxcont indexboxbar"}
255 \div {class="section indexIcon"} \emptyspan
256 \enddiv
257 \div {class="section"}
258 Qt is a cross-platform application and UI
259 framework. Using Qt, you can write web-enabled
260 applications once and deploy them across desktop,
261 mobile and embedded operating systems without
262 rewriting the source code.
263 \enddiv
264 \div {class="section sectionlist"}
265 \list
266 \li Getting Started
267 \li Installation
268 \li How to learn Qt
269 \li Tutorials
270 \li Examples
271 \li What's new in Qt 4.7
272 \endlist
273 \enddiv
274 \enddiv
275 \enddiv
276
277 See also \l {span-command} {\\span}.
278
279 \target span-command
280 \section1 \\span
281
282 The \\span command applies special formatting to a small block of text.
283
284 Two arguments must be provided, each argument in curly braces, as
285 shown in the QDoc comment below. The first argument is not
286 interpreted, but specifies the formatting attribute(s) of the tag
287 output by QDoc. The second argument is the text to be rendered with
288 the special formatting attributes.
289
290 For example, we might want to render the first word of each
291 element in a numeric list in blue.
292
293 \badcode *
294 /\1!
295 Global variables with complex types:
296 \list 1
297 \li \span {class="variableName"} {mutableComplex1} in globals.cpp at line 14
298 \li \span {class="variableName"} {mutableComplex2} in globals.cpp at line 15
299 \li \span {class="variableName"} {constComplex1} in globals.cpp at line 16
300 \li \span {class="variableName"} {constComplex2} in globals.cpp at line 17
301 \endlist
302 \1/
303 \endcode
304
305 Class \e {variableName} refers to a clause in your style.css.
306
307 \code
308 .variableName
309 {
310 font-family: courier;
311 color: blue
312 }
313 \endcode
314
315 Using the \e {variableName} clause shown above, the example is rendered as:
316
317 Global variables with complex types:
318 \list 1
319 \li \span {class="variableName"} {mutableComplex1} in globals.cpp at line 14
320 \li \span {class="variableName"} {mutableComplex2} in globals.cpp at line 15
321 \li \span {class="variableName"} {constComplex1} in globals.cpp at line 16
322 \li \span {class="variableName"} {constComplex2} in globals.cpp at line 17
323 \endlist
324
325 \note The \b span command does not cause a new paragraph to be
326 started.
327
328 See also \l {div-command} {\\div}.
329
330 \target tm-command
331 \section1 \\tm (trademark)
332
333 The \\tm command indicates that its argument is a trademark. QDoc appends
334 a trademark symbol `™` to the first occurrence of the argument when
335 generating a page.
336
337 In the project's configuration, the \c navigation.trademarkspage variable
338 is used for defining a title of a page that contains trademark-related
339 documentation.
340
341 \badcode
342 navigation.trademarkspage = Trademarks
343 \endcode
344
345 If set, each occurrence of the trademark symbol also links to the
346 trademarks page.
347
348 \note In section titles, the \\tm command is ignored and its argument
349 rendered as-is.
350
351 See also \l {sectionOne-command}{\\section1} and \qdocvar {navigation}.
352
353 \target tt-command
354 \section1 \\tt (teletype font)
355
356 The \\tt command renders its argument in a monospace font. This
357 command behaves just like the \l {c-command} {\\c} command, except
358 that \\tt allows you to nest QDoc commands within the argument
359 (e.g. \l {e-command} {\\e}, \l {b-command} {\\b} and \l
360 {underline-command} {\\underline}).
361
362 \badcode *
363 /\1!
364 After having populated the main container with
365 child widgets, \c setupUi() scans the main container's list of
366 slots for names with the form
367 \tt{on_\e{objectName}_\e{signalName}().}
368 \1/
369 \endcode
370
371 If the text to be rendered in the code font contains spaces, enclose the
372 entire text in curly brackets.
373
374 \code
375 \tt {QLineEdit::QLineEdit(const QString &contents, QWidget *parent) :QWidget(parent)}
376 \endcode
377
378 See also \l {c-command} {\\c}.
379
380 \target b-command
381 \section1 \\b
382
383 The \\b command renders its argument in bold font. This command used
384 to be called \\bold.
385
386 \badcode *
387 /\1!
388 This is regular text; \b {this text is
389 rendered using the \\b command}.
390 \1/
391 \endcode
392
393 \target br-command
394 \section1 \\br
395
396 The \\br command forces a line break.
397
398 \target e-command
399 \section1 \\e (emphasis, italics)
400
401 The \\e command renders its argument in a special font, normally italics. This
402 command used to be called \\i, which is now deprecated.
403
404 If the argument contains spaces or other punctuation, enclose the
405 argument in curly brackets.
406
407 \badcode *
408 /\1!
409 Here, we render \e {a few words} in italics.
410 \1/
411 \endcode
412
413 If you want to use other QDoc commands within an argument that
414 contains spaces, you always need to enclose the argument in
415 braces. But QDoc is smart enough to count parentheses, so you
416 don't need braces in cases like this:
417
418 \badcode *
419 /\1!
420 An argument can sometimes contain whitespaces,
421 for example: \e QPushButton(tr("A Brand New Button"))
422 \1/
423 \endcode
424
425 Finally, trailing punctuation is not included in an argument,
426 nor is "'s".
427
428 \target sub-command
429 \section1 \\sub
430
431 The \\sub command renders its argument lower than the baseline of
432 the regular text, using a smaller font.
433
434 \badcode *
435 /\1!
436 Definition (Range): Consider the sequence
437 {x\sub n}\sub {n > 1} . The set
438
439 {x\sub 2, x\sub 3, x\sub 4, ...} = {x\sub n ; n = 2, 3, 4, ...}
440
441 is called the range of the sequence.
442 \1/
443 \endcode
444
445 If the argument contains spaces or other punctuation, enclose the
446 argument in curly brackets.
447
448 \target sup-command
449 \section1 \\sup
450
451 The \\sup command renders its argument higher than
452 the baseline of the regular text, using a smaller font.
453
454 \badcode *
455 /\1!
456 The series
457
458 1 + a + a\sup 2 + a\sup 3 + a\sup 4 + ...
459
460 is called the \i {geometric series}.
461 \1/
462 \endcode
463
464 If the argument contains spaces or other punctuation, enclose the
465 argument in curly brackets.
466
467 \target uicontrol-command
468 \section1 \\uicontrol
469
470 The \\uicontrol command is used to mark content as being used for UI
471 control elements. When using HTML, the output is rendered in bold.
472
473 See also \l {b-command}{\\b}.
474
475 \target underline-command
476 \section1 \\underline
477
478 The \\underline command renders its argument underlined.
479
480 \badcode *
481 /\1!
482 The \underline {F}ile menu gives the users the possibility
483 to edit an existing file, or save a new or modified
484 file, and exit the application.
485 \1/
486 \endcode
487
488 If the argument contains spaces or other punctuation, enclose the
489 argument in curly brackets.
490
491 \target backslash-sequence
492 \section1 \\\\ (double backslash)
493
494 The sequence \\\\ expands to a single backslash.
495
496 QDoc commands always start with a single backslash. To display a
497 single backslash in the text, you must type two backslashes. If
498 you want to display two backslashes, you must type four.
499
500 \badcode *
501 /\1!
502 The \\\\ command is useful if you want a
503 backslash to appear verbatim, for example,
504 writing C:\\windows\\home\\.
505 \1/
506 \endcode
507
508 However, if you want your text to appear in a monospace font as
509 well, you can use the \l {c-command} {\\c} command instead, which
510 accepts and renders the backslash as any other character. For
511 example:
512
513 \badcode *
514 /\1!
515 The \\c command is useful if you want a
516 backslash to appear verbatim, and the word
517 that contains it written in a monospace font,
518 like this: \c {C:\windows\home\}.
519 \1/
520 \endcode
521
522 \target endash-sequence
523 \section1 \-- (en dash)
524 QDoc renders double hyphens as an en dash. QDoc markup commands
525 designed to make their input appear verbatim---such as the \\c
526 command---won't replace the double hyphens with an en dash character.
527 For example:
528
529 \badcode *
530 /\1!
531 The \\c command -- useful if you want text in a monospace font --
532 is well documented.
533 \1/
534 \endcode
535
536 However, other commands may require that the hyphens are escaped to ensure
537 QDoc renders the output as expected. For example;
538
539 \badcode *
540 /\1!
541 This \l {endash-sequence}{link to the -- (endash) sequence}
542 isn't escaped and QDoc therefore renders an endash in the link
543 text. However, the escaped
544 \l {endash-sequence}{link to the \-- (endash) sequence}
545 renders both hyphens as intended.
546 \1/
547 \endcode
548
549 \warning Avoid using en dash in section and page titles. Linking to a title
550 may fail if it contains special characters such as an en dash.
551
552 See also \l {emdash-sequence}{\-\-- (em dash)}.
553
554 \target emdash-sequence
555 \section1 -\-- (em dash)
556
557 QDoc renders triple hyphens as an em dash. QDoc markup commands
558 designed to make their input appear verbatim---such as the \\c
559 command---won't replace the triple hyphens with an em dash character.
560 For example:
561
562 \badcode *
563 /\1!
564 The \\c command---useful when you want text to be rendered
565 verbatim---is well documented.
566 \1/
567 \endcode
568
569 However, other commands may require that the hyphens are escaped to ensure
570 QDoc renders the output as expected. For example;
571
572 \badcode *
573 /\1!
574 This \l {emdash-sequence}{link to the --- (emdash) sequence}
575 isn't escaped and QDoc therefore renders an emdash in the link
576 text. However, the escaped
577 \l {emdash-sequence}{link to the -\-- (emdash) sequence}
578 renders both hyphens as intended.
579 \1/
580 \endcode
581
582 \note The escaped control sequence in this example is for the en dash.
583 This avoids a hyphen followed by an en dash in the output.
584
585 \warning Avoid using em dash in section and page titles. Linking to a title
586 may fail if it contains special characters such as an em dash.
587
588 See also \l {endash-sequence}{\-- (en dash)}.
589*/
590
591
592/*!
593 \page 05-qdoc-commands-documentstructure.html
594 \previouspage Text Markup
595 \nextpage Including Code Inline
596
597 \title Document Structure
598
599 The document structuring commands are for dividing your document
600 into sections. QDoc supports four levels of section: \c \section1,
601 \c \section2, \c \section3, and \c \section4. The section commands
602 correspond to the traditional section, subsection, etc used in
603 outlining.
604
605 \section1 Section commands
606
607 In general a document structuring command considers everything
608 that follows it until the first line break as its argument. The
609 argument is rendered as the unit's title. If the title needs to be
610 spanned over several lines, make sure that each line (except the
611 last one) is ended with a backslash.
612
613 In total, there are four levels for sections in QDoc: \c \section1,
614 \c \section2, \c \section3 and \c \section4. These correspond to the
615 traditional section, subsection, subsubsection and subsubsubsection.
616
617 There is a strict ordering of the section units:
618
619 \code
620 section1
621 |
622 section2
623 |
624 section3
625 |
626 section4
627 \endcode
628
629 When sections are used, the first section command should be \c section1.
630
631 \badcode *
632 /\1!
633 \section1 Basic Qt
634
635 This is the first section.
636
637
638 \section2 Getting Started
639
640 This is the first subsection.
641
642
643 \section3 Hello Qt
644
645 This is the first subsubsection.
646
647
648 \section3 Making Connections
649
650 This is the second subsubsection.
651
652
653 \section3 Using the Reference Documentation
654
655 This is the third subsubsection.
656
657
658 \section2 Creating Dialogs
659
660 This is the second subsection.
661
662
663 \section3 Subclassing QDialog
664
665 This is the first subsubsection.
666
667 ...
668
669
670 \section1 Intermediate Qt
671
672 This is the second section.
673
674
675 \section2 Layout Management
676
677 This is the second section's first subsection.
678
679
680 \section3 Basic Layouts
681
682 This is the first subsubsection.
683
684 ...
685 \1/
686 \endcode
687
688 Each section is a logical unit in the document. The section
689 heading appears in the automatically generated table of contents
690 that normally appears in the upper right-hand corner of the page.
691
692 \target sectionOne-command
693 \section1 \\section1
694
695 The \\section1 command starts a new section.
696
697 See \l{section-commands} {Section commands} for an explanation of the various
698 section units, command argument, and rendering.
699
700 \target sectionTwo-command
701 \section1 \\section2
702
703 The \\section2 command starts a new section.
704
705 See \l{section-commands} {Section commands} for an explanation of the various
706 section units, command argument, and rendering.
707
708 \target sectionThree-command
709 \section1 \\section3
710
711 The \\section3 command starts a new section.
712
713 See \l{section-commands} {Section commands} for an explanation of the various
714 section units, command argument, and rendering.
715
716 \target sectionFour-command
717 \section1 \\section4
718
719 The \\section4 command starts a new section.
720
721 See \l{section-commands} {Section commands} for an explanation of the various
722 section units, command argument, and rendering.
723
724*/
725
726
727/*!
728 \page 06-qdoc-commands-includecodeinline.html
729 \previouspage Document Structure
730 \nextpage Including External Code
731
732 \title Including Code Inline
733
734 The following commands are used to render source code without
735 formatting. The source code begins on a new line, rendered in the
736 code.
737
738 \note Although most of these commands are for rendering C++
739 code, the
740 \l{07-0-qdoc-commands-includingexternalcode.html#snippet-command}
741 {\\snippet} and
742 \l{07-0-qdoc-commands-includingexternalcode.html#codeline-command}
743 {\\codeline} commands are preferred over the others. These
744 commands allow equivalent code snippets for other Qt language
745 bindings to be substituted for the C++ snippets in the
746 documentation.
747
748 \target code-command
749 \section1 \\code
750
751 The \\code and \\endcode commands enclose a snippet of source code.
752
753 \note The \l {c-command} {\\c} command can be used for short code
754 fragments within a sentence. The \\code command is for longer code
755 snippets. It renders the code verbatim in a separate paragraph in
756 a html <pre> element, and parses the enclosed snippet, creating links
757 to any known types in the code.
758
759 For documenting command-line instructions, shell scripts, or any
760 content that is not in a Qt language recognized by QDoc, use
761 \l {badcode-command}{\\badcode} instead.
762
763 When processing the \\code command, QDoc removes all indentation
764 that is common for the verbatim code blocks within a \c{/}\c{*!}
765 ... \c{*}\c{/} comment before it adds the standard indentation.
766
767 \note This doesn't apply to externally quoted code using the \l
768 {quotefromfile-command} {\\quotefromfile} or \l
769 {quotefile-command} {\\quotefile} command.
770
771 \code [text] \\endcode *
772 /*!
773 \code
774 #include <QApplication>
775 #include <QPushButton>
776
777 int main(int argc, char *argv[])
778 {
779 ...
780 }
781 \1
782 \2/
783 \endcode
784
785 Other QDoc commands are disabled within \\code... \\endcode, and
786 the special character '\\' is accepted and rendered like the rest
787 of the code, unless it is followed by a digit and parameters were
788 passed to \\code.
789
790 \section2 Highlighting and autolinking
791
792 The \\code commands attempts to parse its contents as code of a
793 specific language, as defined in the \l {language-variable}{language}
794 configuration variable. This provides highlighting and automatic
795 linking to types detected in the code.
796
797 As an exception since QDoc version 6.4, when the \\code command
798 is used within a QML-specific \l {Topic Commands}{topic}, QDoc
799 first attempts to recognize the code as QML; for other topics,
800 the language configuration variable takes precedence. To
801 explicitly mark the code snippet as QML, use the \l {qml-command}
802 {\\qml} command instead.
803
804 From version 6.11, a language can be specified as an optional
805 case-insensitive argument on the same line as the \\code command.
806 When specified, the language overrides the default language and any
807 other language-specific behavior described above. QDoc also defines
808 the \c text language so that blocks of code can be displayed
809 without any markup or highlighting.
810
811 For example:
812
813 \code [text] \\endcode
814 \code [text]
815 # This is an example of unmarked code.
816 implement MyModule;
817 include "sys.m";
818 sys: Sys;
819 \1
820 \endcode
821
822 This can be useful when quoting a language that QDoc does not have
823 the ability to mark up.
824
825 Alternatively, you can specify a language for a block of code that
826 QDoc doesn't recognize by including the language in the list held
827 by the \l {codelanguages-variable}{codelanguages} configuration
828 variable. This enables metadata to be included in generated HTML
829 that can be used by other tools to syntax highlight the code.
830
831 \section2 Code snippet parameters
832
833 Since QDoc version 5.12, \\code command accepts also optional
834 parameters. Parameters are useful for injecting simple
835 strings into the code snippet. To inject a string to a specific
836 location in the snippet, add a backslash followed by a digit (1..8).
837 The digits correspond with the order of the argument list, where
838 arguments are separated by spaces and follow any optional language
839 argument.
840
841 For example:
842
843 \code [text] 1 2 * endcode
844 /\3!
845 \code * hello
846 /\\1 \\2 \\1/
847 \\4
848 \3/
849 \endcode
850
851 For the above snippet, QDoc renders the word \e hello enclosed in
852 a C-style comment.
853
854 \section2 Including code from external files
855
856 To include code snippets from an external file, use the
857 \l{snippet-command}{\\snippet} and \l{codeline-command}
858 {\\codeline} commands.
859
860 See also \l {c-command}{\\c}, \l {qml-command}{\\qml},
861 \l {badcode-command}{\\badcode}, \l {quotefromfile-command}
862 {\\quotefromfile}, and \l {language-variable}{language}.
863
864 \target badcode-command
865 \section1 \\badcode
866
867 Similar to \l {code-command}{\\code}, \\badcode and \\endcode commands
868 enclose content that is rendered verbatim in a separate paragraph, but no
869 parsing or automatic link creation is performed. Instead, the content is
870 treated as plain text.
871
872 Substitute \\code with this command when documenting command-line
873 instructions, shell scripts or any other content that is not in a Qt
874 language, but should still be styled similarly to a \\code paragraph.
875
876 Like \\code, \\badcode accepts also optional parameters.
877
878 \target qml-command
879 \section1 \\qml
880
881 The \\qml and \\endqml commands enclose a snippet of QML source
882 code. Use these for proper syntax highlighting of QML code snippets.
883 The enclosed snippet must be complete as if it was a valid .qml file.
884 If the snippet is incomplete, QDoc will issue a warning and ignore the
885 snippet.
886
887 \badcode *
888 /\1!
889 \qml
890 import QtQuick 2.0
891
892 Row {
893 Rectangle {
894 width: 100; height: 100
895 color: "blue"
896 transform: Translate { y: 20 }
897 }
898 Rectangle {
899 width: 100; height: 100
900 color: "red"
901 transform: Translate { y: -20 }
902 }
903 }
904 \endqml
905 \1/
906 \endcode
907
908 Like the \l{code-command}{\\code} command, \\qml accepts optional
909 parameters.
910*/
911
912
913/*!
914 \page 07-0-qdoc-commands-includingexternalcode.html
915 \previouspage Including Code Inline
916 \nextpage Creating Links
917
918 \title Including External Code
919
920 The following commands enable you to include code snippets from
921 external files. You can make QDoc include the complete contents of
922 a file, or you can quote specific parts of the file and skip
923 others. The typical use of the latter is to quote a file chunk by
924 chunk.
925
926 \note Although all these commands can be used for rendering C++
927 code, the
928 \l{07-0-qdoc-commands-includingexternalcode.html#snippet-command}
929 {\\snippet} and
930 \l{07-0-qdoc-commands-includingexternalcode.html#codeline-command}
931 {\\codeline} commands are preferred over the others. These
932 commands allow equivalent code snippets for other Qt language
933 bindings to be substituted for the C++ snippets in the
934 documentation.
935
936 \target quotefile-command
937 \section1 \\quotefile
938
939 The \\quotefile command expands to the complete contents of the
940 file given as argument.
941
942 The command considers the rest of the line as part of its
943 argument, make sure to follow the file name with a line break.
944
945 The file's contents is rendered in a separate paragraph, using a
946 monospace font and the standard indentation. The code is shown
947 verbatim.
948
949 \badcode *
950 /\1!
951 This is a simple "Hello world" example:
952
953 \quotefile examples/main.cpp
954
955 It contains only the bare minimum you need
956 to get a Qt application up and running.
957 \1/
958 \endcode
959
960 From version 6.11, a language can be specified as an optional
961 case-insensitive argument on the same line as the \\quotefile
962 command.
963 This influences the quoted text in the same way as for the
964 \l{code-command}{\\code} command.
965
966 For example:
967
968 \code [text]
969 \quotefile [text] examples/main.cpp
970 \endcode
971
972 This can be useful when quoting from a file containing source code
973 that QDoc does not have the ability to mark up.
974
975 See also \l {quotefromfile-command} {\\quotefromfile} and
976 \l {code-command} {\\code}.
977
978
979 \target quotefromfile-command
980 \section1 \\quotefromfile
981
982 The \\quotefromfile command opens the file given as argument for
983 quoting.
984
985 The command considers the rest of the line as part of its
986 argument, make sure to follow the file name with a line break.
987
988 The command is intended for use when quoting parts from file with
989 the walkthrough commands: \l {printline-command} {\\printline}, \l
990 {printto-command} {\\printto}, \l {printuntil-command}
991 {\\printuntil}, \l {skipline-command} {\\skipline}, \l
992 {skipto-command} {\\skipto}, \l {skipuntil-command}
993 {\\skipuntil}. This enables you to quote specific portions of a
994 file.
995
996 \badcode *
997 /\1!
998 The whole application is contained within
999 the \c main() function:
1000
1001 \quotefromfile examples/main.cpp
1002
1003 \skipto main
1004 \printuntil app(argc, argv)
1005
1006 First we create a QApplication object using
1007 the \c argc and \c argv parameters.
1008
1009 \skipto QPushButton
1010 \printuntil resize
1011
1012 Then we create a QPushButton, and give it a reasonable
1013 size using the QWidget::resize() function.
1014
1015 ...
1016 \1/
1017 \endcode
1018
1019 QDoc remembers which file it is quoting from, and the current
1020 position in that file (see \l {file} {\\printline} for more
1021 information). There is no need to "close" the file.
1022
1023 From version 6.11, a language can be specified as an optional
1024 case-insensitive argument on the same line as the
1025 \\quotefromfile command. This influences the quoted text in the
1026 same way as for the \l{code-command}{\\code} command.
1027
1028 For example:
1029
1030 \code [text]
1031 \quotefromfile [text] examples/main.cpp
1032 \skipto main
1033 \printuntil app(argc, argv)
1034 \endcode
1035
1036 QDoc also remembers which code language it is quoting from, so
1037 commands like \l{printline-command}{\\printline},
1038 \l{printto-command}{\\printto} and \l{printuntil-command}{\\printuntil}
1039 quote from the current file, applying a consistent style of markup
1040 until a new file is read.
1041
1042 See also \l {quotefile-command} {\\quotefile}, \l {code-command}
1043 {\\code} and \l {dots} {\\dots}.
1044
1045 \target printline-command
1046 \section1 \\printline
1047
1048 The \\printline command expands to the line from the current
1049 position.
1050
1051 To ensure that the documentation remains synchronized with the
1052 source file, a substring of the line must be specified as an
1053 argument to the command. Note that the command considers the rest
1054 of the line as part of its argument, make sure to follow the
1055 substring with a line break.
1056
1057 The line from the source file is rendered as a separate paragraph,
1058 using a monospace font and the standard indentation. The code is
1059 shown verbatim.
1060
1061 \badcode *
1062 /\1!
1063 There has to be exactly one QApplication object
1064 in every GUI application that uses Qt.
1065
1066 \quotefromfile examples/main.cpp
1067
1068 \printline QApplication
1069
1070 This line includes the QApplication class
1071 definition. QApplication manages various
1072 application-wide resources, such as the
1073 default font and cursor.
1074
1075 \printline QPushButton
1076
1077 This line includes the QPushButton class
1078 definition. The QPushButton widget provides a command
1079 button.
1080
1081 \printline main
1082
1083 The main function...
1084 \1/
1085 \endcode
1086
1087 \target file
1088
1089 QDoc reads the file sequentially. To move the current position
1090 forward you can use either of the \l {skipline-command}
1091 {\\skip...} commands. To move the current position backward, you
1092 can use the \l {quotefromfile-command} {\\quotefromfile} command
1093 again.
1094
1095 \target substring
1096
1097 If the substring argument is surrounded by slashes it is
1098 interpreted as a \l {QRegularExpression}{regular expression}.
1099
1100 \badcode *
1101 /\1!
1102 \quotefromfile examples/mainwindow.cpp
1103
1104 \skipto closeEvent
1105 \printuntil /^\}/
1106
1107 Close events are sent to widgets that the users want to
1108 close, usually by clicking \c File|Exit or by clicking
1109 the \c X title bar button. By reimplementing the event
1110 handler, we can intercept attempts to close the
1111 application.
1112 \1/
1113 \endcode
1114
1115 (\l {widgets/scribble} {The complete example file...})
1116
1117 The regular expression \c /^\}/ makes QDoc print until the first
1118 '}' character occurring at the beginning of the line without
1119 indentation. /.../ encloses the regular expression, and '^' means
1120 the beginning of the line. The '}' character must be escaped since
1121 it is a special character in regular expressions.
1122
1123 QDoc will emit a warning if the specified substring or regular
1124 expression cannot be located, i.e. if the source code has changed.
1125
1126 See also \l {printto-command} {\\printto} and \l
1127 {printuntil-command} {\\printuntil}.
1128
1129 \target printto-command
1130 \section1 \\printto
1131
1132 The \\printto command expands to all the lines from the current
1133 position up to and \e excluding the next line containing a given
1134 substring.
1135
1136 The command considers the rest of the line as part of its
1137 argument, make sure to follow the substring with a line break. The
1138 command also follows the same conventions for \l {file}
1139 {positioning} and \l {substring} {argument} as the \l
1140 {printline-command} {\\printline} command.
1141
1142 The lines from the source file are rendered in a separate
1143 paragraph, using a monospace font and the standard
1144 indentation. The code is shown verbatim.
1145
1146 \badcode *
1147 /\1!
1148 The whole application is contained within the
1149 \c main() function:
1150
1151 \quotefromfile examples/main.cpp
1152 \printto hello
1153
1154 First we create a QApplication object using the \c argc and
1155 \c argv parameters...
1156 \1/
1157 \endcode
1158
1159 See also \l {printline-command} {\\printline} and \l
1160 {printuntil-command} {\\printuntil}.
1161
1162 \target printuntil-command
1163 \section1 \\printuntil
1164
1165 The \\printuntil command expands to all the lines from the current
1166 position up to and \e including the next line containing a given
1167 substring.
1168
1169 The command considers the rest of the line as part of its
1170 argument, make sure to follow the substring with a line break. The
1171 command also follows the same conventions for \l {file}
1172 {positioning} and \l {substring} {argument} as the \l
1173 {printline-command} {\\printline} command.
1174
1175 If \\printuntil is used without an argument, it expands to all the
1176 lines from the current position to the end of the quoted file.
1177
1178 The lines from the source file are rendered in a separate
1179 paragraph, using a monospace font and the standard
1180 indentation. The code is shown verbatim.
1181
1182 \badcode *
1183 /\1!
1184 The whole application is contained within the
1185 \c main() function:
1186
1187 \quotefromfile examples/main.cpp
1188 \skipto main
1189 \printuntil hello
1190
1191 First we create a QApplication object using the
1192 \c argc and \c argv parameters, then we create
1193 a QPushButton.
1194 \1/
1195 \endcode
1196
1197 See also \l {printline-command} {\\printline} and \l
1198 {printto-command} {\\printto}.
1199
1200 \target skipline-command
1201 \section1 \\skipline
1202
1203 The \\skipline command ignores the next non-blank line in the
1204 current source file.
1205
1206 Doc reads the file sequentially, and the \\skipline command is
1207 used to move the current position (omitting a line of the source
1208 file). See the remark about \l {file} {file positioning} above.
1209
1210 The command considers the rest of the line as part of its
1211 argument, make sure to follow the substring with a line break. The
1212 command also follows the same conventions for \l {substring}
1213 {argument} as the \l {printline-command} {\\printline} command,
1214 and it is used in conjunction with the \l {quotefromfile-command}
1215 {\\quotefromfile} command.
1216
1217 \badcode *
1218 /\1!
1219 QPushButton is a GUI push button that the user
1220 can press and release.
1221
1222 \quotefromfile examples/main.cpp
1223 \skipline QApplication
1224 \printline QPushButton
1225
1226 This line includes the QPushButton class
1227 definition. For each class that is part of the
1228 public Qt API, there exists a header file of
1229 the same name that contains its definition.
1230 \1/
1231 \endcode
1232
1233
1234 See also \l {skipto-command} {\\skipto}, \l {skipuntil-command}
1235 {\\skipuntil} and \l {dots} {\\dots}.
1236
1237 \target skipto-command
1238 \section1 \\skipto
1239
1240 The \\skipto command ignores all the lines from the current
1241 position up to and \e excluding the next line containing a given
1242 substring.
1243
1244 QDoc reads the file sequentially, and the \\skipto command is used
1245 to move the current position (omitting one or several lines of the
1246 source file). See the remark about \l {file} {file positioning}
1247 above.
1248
1249 The command considers the rest of the line as part of its
1250 argument, make sure to follow the substring with a line break.
1251
1252 The command also follows the same conventions for \l {substring}
1253 {argument} as the \l {printline-command} {\\printline} command,
1254 and it is used in conjunction with the \l {quotefromfile-command}
1255 {\\quotefromfile} command.
1256
1257 \badcode *
1258 /\1!
1259 The whole application is contained within
1260 the \c main() function:
1261
1262 \quotefromfile examples/main.cpp
1263 \skipto main
1264 \printuntil }
1265
1266 First we create a QApplication object. There
1267 has to be exactly one such object in
1268 every GUI application that uses Qt. Then
1269 we create a QPushButton, resize it to a reasonable
1270 size ...
1271 \1/
1272 \endcode
1273
1274 See also \l {skipline-command} {\\skipline}, \l
1275 {skipuntil-command} {\\skipuntil} and \l {dots} {\\dots}.
1276
1277 \target skipuntil-command
1278 \section1 \\skipuntil
1279
1280 The \\skipuntil command ignores all the lines from the current
1281 position up to and \e including the next line containing a given
1282 substring.
1283
1284 QDoc reads the file sequentially, and the \\skipuntil command is
1285 used to move the current position (omitting one or several lines
1286 of the source file). See the remark about \l {file} {file
1287 positioning} above.
1288
1289 The command considers the rest of the line as part of its
1290 argument, make sure to follow the substring with a line break.
1291
1292 The command also follows the same conventions for \l {substring}
1293 {argument} as the \l {printline-command} {\\printline} command,
1294 and it is used in conjunction with the \l {quotefromfile-command}
1295 {\\quotefromfile} command.
1296
1297 \badcode *
1298 /\1!
1299 The first thing we did in the \c main() function
1300 was to create a QApplication object \c app.
1301
1302 \quotefromfile examples/main.cpp
1303 \skipuntil show
1304 \dots
1305 \printuntil }
1306
1307 In the end we must remember to make \c main() pass the
1308 control to Qt. QCoreApplication::exec() will return when
1309 the application exits...
1310 \1/
1311 \endcode
1312
1313 See also \l {skipline-command} {\\skipline}, \l {skipto-command}
1314 {\\skipto} and \l {dots} {\\dots}.
1315
1316 \target dots-command
1317 \section1 \\dots
1318
1319 The \\dots command indicates that parts of the source file have
1320 been omitted when quoting a file.
1321
1322 The command is used in conjunction with the \l
1323 {quotefromfile-command} {\\quotefromfile} command, and should be
1324 stated on its own line. The dots are rendered on a new line, using
1325 a monospace font.
1326
1327 \badcode *
1328 /\1!
1329 \quotefromfile examples/main.cpp
1330 \skipto main
1331 \printuntil {
1332 \dots
1333 \skipuntil exec
1334 \printline }
1335 \1/
1336 \endcode
1337
1338 The default indentation is 4 spaces, but this can be adjusted
1339 using the command's optional argument.
1340
1341 \badcode *
1342 /\1!
1343 \dots 0
1344 \dots
1345 \dots 8
1346 \dots 12
1347 \dots 16
1348 \1/
1349 \endcode
1350
1351 See also \l {skipline-command} {\\skipline}, \l {skipto-command}
1352 {\\skipto} and \l {skipuntil-command} {\\skipuntil}.
1353
1354 \target snippet-command
1355 \section1 \\snippet
1356
1357 The \\snippet command causes a code snippet to be included
1358 verbatim as preformatted text, which may be syntax highlighted.
1359
1360 Each code snippet is referenced by the file that holds it and by
1361 a unique identifier for that file. Snippet files are typically
1362 stored in a \c{snippets} directory inside the documentation
1363 directory (for example, \c{$QTDIR/doc/src/snippets}).
1364
1365 \note QDoc resolves a relative snippet path against the directories
1366 configured by the \l {exampledirs-variable}{exampledirs} and
1367 \l {imagedirs-variable}{imagedirs} variables (plus any \c{doc/images}
1368 directories found beneath the example directories). It does \e not search
1369 \c{sourcedirs} or \c{headerdirs}, so snippet files that live in a separate
1370 tree from your examples must still be reachable from \c{exampledirs} or
1371 \c{imagedirs}. The \l {quotefile-command}{\\quotefile} and
1372 \l {quotefromfile-command}{\\quotefromfile} commands resolve their files the
1373 same way.
1374
1375 QDoc uses the first matching file it finds. When the same relative path
1376 exists under more than one search directory, QDoc consults the directories
1377 in lexicographic path order, so one file can shadow another.
1378
1379 For example, the following documentation references a snippet in a
1380 file residing in a subdirectory of the documentation directory:
1381
1382 \code
1383 \snippet snippets/textdocument-resources/main.cpp Adding a resource
1384 \endcode
1385
1386 The text following the file name is the unique identifier for the
1387 snippet. This is used to delimit the quoted code in the relevant
1388 snippet file, as shown in the following example that corresponds to
1389 the above \c{\snippet} command:
1390
1391 \code
1392 ...
1393 QImage image(64, 64, QImage::Format_RGB32);
1394 image.fill(qRgb(255, 160, 128));
1395
1396//! [Adding a resource]
1397 document->addResource(QTextDocument::ImageResource,
1398 QUrl("mydata://image.png"), QVariant(image));
1399//! [Adding a resource]
1400 ...
1401 \endcode
1402
1403 By default, QDoc looks for \c{//!} as a code snippet marker.
1404 For \c{.pro}, \c{.py}, \c{.cmake}, and \c{CMakeLists.txt}
1405 files, \c {#!} is detected. Finally, \c{<!--} is accepted in
1406 \c{.html}, \c{.qrc}, \c{.ui}, \c{.xml}, and \c{.xq} files.
1407
1408 QDoc normalizes snippet indentation by comparing the snippet-marker's
1409 space-based indentation against the snippet's minimum content indentation
1410 (ignoring Qt-macros, blank lines, and full-line comments). It then
1411 automatically un-indents the snippet body to whichever is smaller,
1412 ensuring the generated code always preserves its natural structure
1413 regardless of where the markers sit. Under-indented markers are left
1414 untouched.
1415
1416 \note QDoc only handles space characters for indentation normalization,
1417 not tabs or other whitespace. For best results, use consistent space-based
1418 indentation in source files containing snippets.
1419
1420 From version 6.11, a language can be specified as an optional
1421 case-insensitive argument on the same line as the \\snippet command.
1422 This influences the quoted text in the same way as for the
1423 \l{code-command}{\\code} command.
1424
1425 This example use of the command overrides the default C++ markup style
1426 and outputs plain text instead:
1427
1428 \code [text]
1429 \snippet [text] code.cpp
1430 \endcode
1431
1432 This can be useful when quoting a language that QDoc does not have
1433 the ability to mark up, or when needing to quote from a file with an
1434 unconventional file name.
1435
1436 \target codeline-command
1437 \section1 \\codeline
1438
1439 The \\codeline command inserts a blank line of preformatted
1440 text. It is used to insert gaps between snippets without closing
1441 the current preformatted text area and opening a new one.
1442
1443*/
1444
1445
1446/*!
1447 \page 08-qdoc-commands-creatinglinks.html
1448 \previouspage Including External Code
1449 \nextpage Including Images
1450
1451 \title Creating Links
1452
1453 These commands are for creating hyperlinks to classes, functions,
1454 examples, and other targets.
1455
1456 \target l-command
1457 \section1 \\l (link)
1458
1459 The \\l link command is used to create a hyperlink to many
1460 different kinds of targets. The command's general syntax is:
1461
1462 \code
1463 \l [ link criteria ] { link target } { link text }
1464 \endcode
1465
1466 ...where the \c {link criteria} in square brackets are optional
1467 but may be required when the \c {link target} is ambiguous. See
1468 \l {Fixing Ambiguous Links} below.
1469
1470 You can use the \\l command to link to:
1471
1472 \list
1473
1474 \li an external page:
1475
1476 \badcode
1477 An URL with a custom link text:
1478 \l {https://doc.qt.io/qt-6/} {Qt 6 Documentation}.
1479
1480 An URL without a custom link text: \l {https://doc.qt.io/qt-6/}.
1481 \endcode
1482
1483 Renders as:
1484
1485 An URL with a custom link text:
1486 \l {https://doc.qt.io/qt-6/} {Qt 6 Documentation}.
1487
1488 An URL without a custom link text: \l {https://doc.qt.io/qt-6/}.
1489
1490 See also \l {externalpage-command}{\\externalpage}.
1491
1492 \li a documentation page. The link target can be:
1493
1494 \list
1495 \li the page title specified with the \l {title-command} {\\title}
1496 command:
1497
1498 \badcode
1499 Here is a link with a custom link text:
1500 \l {Getting Started with QDoc}{QDoc - Getting Started}.
1501
1502 Here is a link with a link text that is the same as the link
1503 target: \l {Getting Started with QDoc}.
1504 \endcode
1505
1506 Renders as:
1507
1508 Here is a link with a custom link text:
1509 \l {Getting Started with QDoc}{QDoc - Getting Started}.
1510
1511 Here is a link with a link text that is the same as link target:
1512 \l {Getting Started with QDoc}.
1513
1514 \li the page file name specified with the \l {page-command} {\\page}
1515 command:
1516
1517 \badcode
1518 \page 08-qdoc-commands-creatinglinks.html
1519 \title Creating Links
1520
1521 These commands are for creating hyperlinks to classes, functions,
1522 examples, and other targets.
1523
1524 ...
1525
1526 The \l {08-qdoc-commands-creatinglinks.html} {Creating Links page}
1527 explains how to create links with QDoc.
1528 \endcode
1529
1530 Renders as:
1531
1532 The \l {08-qdoc-commands-creatinglinks.html} {Creating Links page}
1533 article explains how to create links with QDoc.
1534
1535 \li the page with a \l {keyword-command} {\\keyword} command.
1536 \endlist
1537
1538 \li a particular anchor section within a document. The link target can be:
1539
1540 \list
1541 \li a section title specified with one of the
1542 \l{section-commands} {Section commands}:
1543
1544 \badcode
1545 Here is a link to a QDoc Commands section of the Writing
1546 Documentation topic:
1547 \l {Writing Documentation#QDoc Commands}{QDoc Commands}.
1548
1549 If you have unique section titles across your documentation
1550 project, you can use the section title as a target without
1551 the need to add the topic title:
1552 \l {QDoc Commands}.
1553 \endcode
1554
1555 Renders as:
1556
1557 Here is a link to a QDoc Commands section of the Writing
1558 Documentation topic:
1559 \l {Writing Documentation#QDoc Commands}{QDoc Commands}.
1560
1561 If you have unique section titles across your documentation
1562 project, you can use the section title as a target without the
1563 need to add the topic title:
1564 \l {QDoc Commands}.
1565
1566 Since the \c # character is used for the purpose of linking
1567 within documents it cannot be used verbatim when linking to
1568 titles that contain it. Instead, it must be escaped using a
1569 backslash:
1570
1571 \badcode
1572 \l {Using Qt with C\\#}
1573 \endcode
1574
1575 Two backslashes are used because QDoc will process the text
1576 before it is supplied to the link command.
1577
1578 \li an anchor defined with a \l {target-command}{\\target} command:
1579 \badcode
1580 \target assertions
1581
1582 Assertions make some statement about the text at the
1583 point where they occur in the regexp, but they do not
1584 match any characters.
1585
1586 ...
1587
1588 Regexps are built up from expressions, quantifiers, and
1589 \l {assertions} {assertions}.
1590
1591 \endcode
1592
1593 \endlist
1594
1595 \li an API item. Target links can be:
1596
1597 \list
1598 \li \c {\l QWidget} - The name of a class documented with the
1599 \l {class-command} {\\class} or
1600 \l {qmltype-command}{\\qmltype} command.
1601
1602 \li \c {\l QWidget::sizeHint()} - The signature of a function
1603 without parameters. If a matching function without
1604 parameters can't be found, the link is satisfied with the
1605 first matching function found.
1606
1607 \li \c {\l QWidget::removeAction(QAction* action)} - The
1608 signature of a function with parameters. If an exact match is
1609 not found, the link is not satisfied and QDoc reports a
1610 \e {Can't link to...} error.
1611
1612 \li \c {\l <QtGlobal>} - The subject of a \l {headerfile-command}
1613 {\\headerfile} command.
1614
1615 \li \c {\l QWidget::geometry} - The signature of a property
1616 defined for a QObject subclass.
1617
1618 \li \c {\l Item.height} - The signature of a property defined for
1619 a QML type.
1620
1621 \endlist
1622
1623 If you only want the function name to appear in the link, you
1624 can use the following syntax: \c {\l{QWidget::}{sizeHint()}}.
1625
1626 \li an example. The target link is the example title or a relative path
1627 used in an \l {example-command} {\\example} command:
1628
1629 \badcode *
1630 /\1!
1631 \example widgets/imageviewer
1632 \title ImageViewer Example
1633 \brief Shows how to combine QLabel and QScrollArea
1634 to display an image.
1635
1636 ...
1637 \1/
1638
1639 ...
1640
1641 See the example: \l widgets/imageviewer
1642 \endcode
1643 \endlist
1644
1645 If the link target is equivalent to the link text, you can omit the second
1646 argument.
1647
1648 For example, if you have documentation like:
1649
1650 \badcode *
1651 /\1!
1652 \target assertions
1653
1654 Assertions make some statement about the text at the
1655 point where they occur in the regexp, but they do not
1656 match any characters.
1657
1658 ...
1659
1660 Regexps are built up from expressions, quantifiers, and
1661 \l {assertions} {assertions}.
1662 \1/
1663 \endcode
1664
1665 You can simplify this as follows:
1666
1667 \badcode *
1668 /\1!
1669 \target assertions
1670
1671 Assertions make some statement about the text at the
1672 point where they occur in the regexp, but they do not
1673 match any characters.
1674
1675 ...
1676
1677 Regexps are built up from expressions, quantifiers, and
1678 \l assertions.
1679 \1/
1680 \endcode
1681
1682 For the one-parameter version, the braces can often be omitted.
1683
1684 \target qdoc-automatic-linking
1685 \section2 Automatic linking
1686
1687 QDoc also tries to make a link out of any word that doesn't
1688 resemble a normal English word, for example, Qt class names or
1689 functions, like QWidget or QWidget::sizeHint(). In these cases,
1690 the \\l command can actually be omitted, but by using the command,
1691 you ensure that QDoc will emit a warning if it cannot find the
1692 link target.
1693
1694 If auto-linking produces an unwanted link for a word that
1695 happens to match a link target, you can suppress it with the
1696 \l {ignorewords-variable} {ignorewords} configuration variable.
1697
1698 \section2 Fixing Ambiguous Links
1699
1700 An ambiguous link is one that has a matching target in more than one Qt
1701 module or documentation set. For example, the same section title can appear
1702 in more than one Qt module, or the name of a C++ class in one module
1703 can also be the name of a QML type in another module.
1704 A real example in Qt is the name Qt itself: it is the name of both a C++
1705 namespace in QtCore and a QML type in QtQml.
1706
1707 Suppose we want to link to the \l {Qt} {Qt C++ namespace}. At the
1708 time QDoc generated this HTML page, that link was correct. Does
1709 it still go to the C++ namespace? Qdoc generated that link from
1710 this link command:
1711
1712 \list
1713 \li \c {\l {Qt} {Qt C++ namespace}}
1714 \endlist
1715
1716 Now suppose we want to link to the \l [QML] {Qt} {Qt QML type}.
1717 At the time QDoc generated this HTML page, that link was also
1718 correct, but we had to use this link command:
1719
1720 \list
1721 \li \c {\l [QML] {Qt} {Qt QML type}}
1722 \endlist
1723
1724 The \e {QML} in \e {square brackets} tells QDoc to accept a
1725 matching target only if the target is on a QML page. Qdoc actually
1726 finds the C++ namespace target first, but since that target is on
1727 a C++ page, QDoc ignores it and keeps looking until it finds the
1728 same target on a QML page.
1729
1730 Without the guidance in the \e{\\l command} in the optional \e
1731 {square bracket} argument, QDoc links to the first matching target
1732 it finds. QDoc can't warn that the link was ambiguous in such
1733 cases because it doesn't know that another matching target exists.
1734
1735 \section2 What arguments can appear in square brackets?
1736
1737 A link command with square bracket argument has the following syntax:
1738 \list
1739 \c {\l [QML|CPP|DOC|attached|QtModuleName] {link target} {link text}}
1740 \endlist
1741
1742 The \e {square bracket} argument is only allowed in the \c {\l
1743 (link)} command. The example above shows how \c QML is used as the
1744 \e {square brackets} argument to force QDoc to match a QML target.
1745 Most often, this will be a QML type, but it can also be a QML
1746 member function or property. Additionally, some QML types contain
1747 properties and attached properties with the same name. Attached
1748 properties can be selected with an \c attached argument.
1749 If \c attached is omitted, regular properties will be linked to
1750 in preference to attached properties with duplicate names.
1751
1752 In the example, QDoc didn't need a \e {square bracket} argument to
1753 find the Qt C++ namespace page, because that one was the first
1754 matching target QDoc found anyway. However, to force QDoc to find
1755 a C++ target when a matching QML target gets in the way, \c CPP
1756 can be used as the \e {square bracket} argument. For example, the
1757 following link will force QDoc to ignore the Qt QML type and continue
1758 searching until it matches the Qt C++ namespace.
1759
1760 \list
1761 \li \c {\l [CPP] {Qt} {Qt C++ namespace}}
1762 \endlist
1763
1764 If the link target is neither a C++ nor a QML entity, \c {DOC} can
1765 be used as the \e {square bracket} argument to prevent QDoc from
1766 matching either of those. At this writing, there were no cases of
1767 ambiguous links where using \c {DOC} was required.
1768
1769 Often, the documentor knows which Qt module the link target is
1770 in. When the module name is known, use the module name as the \e
1771 {square bracket} argument. In the example above, if we know that
1772 the QML type named Qt is located in the QtQml module, we can write
1773 the link command like this:
1774
1775 \list
1776 \li \c {\l [QtQml] {Qt} {Qt QML type}}
1777 \endlist
1778
1779 When a module name is used as the \e {square bracket} argument,
1780 QDoc will search for the link target in that module only. This
1781 makes searching for link targets more efficient.
1782
1783 Finally, the module name and entity type arguments can be
1784 combined, separated by a blank, so something like this is also
1785 allowed:
1786
1787 \list
1788 \li \c {\l [CPP QtQml] {Window} {C++ class Window}}
1789 \endlist
1790
1791 As of this writing, there were no cases where combining the two
1792 was required.
1793
1794 See also \l {sa-command} {\\sa}, \l {target-command} {\\target},
1795 and \l {keyword-command} {\\keyword}.
1796
1797
1798 \target sa-command
1799 \section1 \\sa (see also)
1800
1801 The \\sa command defines a list of links that will be rendered in
1802 a separate "See also" section at the bottom of the documentation
1803 unit.
1804
1805 The command takes a comma-separated list of links as its
1806 argument. If the line ends with a comma, you can continue
1807 the list on the next line. The general syntax is:
1808
1809 \code
1810 \sa {the first link}, {the second link},
1811 {the third link}, ...
1812 \endcode
1813
1814 QDoc will automatically try to generate "See also" links
1815 interconnecting a property's various functions. For example, a
1816 setVisible() function will automatically get a link to visible()
1817 and vice versa.
1818
1819 In general, QDoc will generate "See also" links that interconnect
1820 the functions that access the same property. It recognizes four
1821 different syntax versions:
1822
1823 \list
1824 \li \c property()
1825 \li \c setProperty()
1826 \li \c isProperty()
1827 \li \c hasProperty()
1828 \endlist
1829
1830 The \\sa command supports the same kind of links as the \l
1831 {l-command} {\\l} command.
1832
1833 \badcode *
1834 /\1!
1835 Appends the actions \a actions to this widget's
1836 list of actions.
1837
1838 \sa removeAction(), QMenu, addAction()
1839 \1/
1840 void QWidget::addActions(QList<QAction *> actions)
1841 {
1842 ...
1843 }
1844 \endcode
1845
1846 See also \l {l-command} {\\l}, \l {target-command} {\\target} and
1847 \l {keyword-command} {\\keyword}.
1848
1849
1850 \target target-command
1851 \section1 \\target
1852
1853 The \\target command names a place in the documentation that you
1854 can link to using the \l {l-command} {\\l (link)} and \l
1855 {sa-command} {\\sa (see also)} commands.
1856
1857 \e{The text up to the line break becomes the target name}. Be sure
1858 to follow the target name with a line break. Curly brackets are not
1859 required around the target name, but they may be required when the
1860 target name is used in a link command. See below.
1861
1862 \badcode *
1863 /\1!
1864 \target capturing parentheses
1865 \section1 Capturing Text
1866
1867 Parentheses allow us to group elements together so that
1868 we can quantify and capture them.
1869
1870 ...
1871 \1/
1872 \endcode
1873
1874 The target name \e{capturing parentheses} can be linked to
1875 in the following way:
1876
1877 \list
1878 \li \c {\l {capturing parentheses}}
1879 \endlist
1880
1881 Above, the target name is enclosed in brackets because it contains
1882 spaces.
1883
1884 \note The \\target command does not support \qdocvar macro expansion
1885 in its argument.
1886
1887 \section2 \\target in a \\table
1888 When you use the \\target command in a table, make sure that the
1889 \\target command follows a \l {li-command}{\\li}-command (table
1890 cell), as some generators only support targets to an individual cell,
1891 not to a whole row.
1892 Moreover, ensure that it's either on a separate line, or the last content
1893 that occurs in the line it's in. This is due to how the \\target
1894 command works; it consumes anything up to the next line break as
1895 its parameter. In other words, if you have a table and need a
1896 \\target within it, make sure that it follows the following
1897 structure:
1898
1899 \badcode
1900 \table
1901 \row
1902 \li \target my-target
1903 My text goes here.
1904 \li This is my next table cell.
1905 \endtable
1906 \endcode
1907
1908 See also \l {l-command} {\\l}, \l {sa-command} {\\sa} and \l
1909 {keyword-command} {\\keyword}.
1910
1911 \target keyword-command
1912 \section1 \\keyword
1913
1914 The \\keyword command names a place in the documentation that you
1915 can link to using the \l {l-command} {\\l (link)} and \l
1916 {sa-command} {\\sa (see also)} commands. It also adds the keyword
1917 and the location to generated indices.
1918
1919 The \\keyword command is like the \l {target-command} {\\target}
1920 command, except that when linking to a keyword, by default the link
1921 goes to the top of the QDoc comment (topic) the \\keyword appears in.
1922
1923 If you want to create a keyword for a \c section unit within a
1924 topic, add the \\keyword directly above the section title:
1925
1926 \badcode
1927 \keyword debug
1928 \section1 Debug command line option (--debug)
1929 ...
1930 \endcode
1931
1932 Unlike \\target, keywords are registered in indices of generated
1933 offline documentation files (.qch). This allows users to look up the
1934 location by keyword, for instance, in
1935 \l[QtAssistant]{Searching for Keywords}{Qt Assistant's Index Search},
1936 and makes the keyword accessible in \QC's context help.
1937
1938 Keywords must be unique over all the documents processed during
1939 the QDoc run. The command uses the rest of the line as its
1940 argument. Be sure to follow the keyword with a line break.
1941
1942
1943 \badcode *
1944 /\1!
1945 \class QRegularExpression
1946 \reentrant
1947 \brief The QRegularExpression class provides pattern
1948 matching using regular expressions.
1949 \ingroup tools
1950 \ingroup misc
1951 \ingroup shared
1952
1953 \keyword regular expression
1954
1955 Regular expressions, or "regexps", provide a way to
1956 find patterns within text.
1957
1958 ...
1959 \1/
1960 \endcode
1961
1962 The location marked with the keyword can be linked to with:
1963
1964 \badcode *
1965 /\1!
1966 When a string is surrounded by slashes, it is
1967 interpreted as a \l {regular expression}.
1968 \1/
1969 \endcode
1970
1971 If the keyword text contains spaces, the brackets are required.
1972
1973 \note The \\keyword command does not support \qdocvar macro expansion
1974 in its argument.
1975
1976 See also \l {l-command} {\\l (link)}, \l {sa-command} {\\sa (see
1977 also)} and \l {target-command} {\\target}.
1978
1979*/
1980
1981
1982/*!
1983 \page 09-qdoc-commands-includingimages.html
1984 \previouspage Creating Links
1985 \nextpage Tables and Lists
1986
1987 \title Including Images
1988
1989 The graphic commands makes it possible to include images in the
1990 documentation. The images can be rendered as separate paragraphs,
1991 or within running text.
1992
1993 \target image-command
1994 \section1 \\image
1995
1996 The \\image command expands to the image specified by its first
1997 argument, and renders it centered as a separate paragraph.
1998
1999 The command takes two arguments. The first argument is the name of
2000 the image file. The second argument is a description of what
2001 the image contains, and is used for the HTML \c alt attribute.
2002 Its contents is read aloud by screen readers, and its use is therefore
2003 strongly recommended for accessibility purposes. It may also be used by
2004 browsers that don't support images, like the Lynx text browser. You
2005 can also set the \l {usealttextastitle-variable} {usealttextastitle}
2006 variable to make QDoc generate a \e title attribute for the image, which
2007 commonly is rendered by graphical text browsers as a tooltip when the user
2008 hovers the mouse over the image.
2009
2010 While QDoc is quite forgiving, you should wrap both the file name and the
2011 description in curly braces, like so:
2012 \badcode
2013 \image {Bandit.png} {A Golden Retriever holding a bag of coffee in its mouth}
2014 \endcode
2015 This syntax is the most explicit and should always give the expected result.
2016 If not, be sure to follow the file name or the description with a line break.
2017 Curly brackets are required if the description argument spans multiple lines.
2018 If the description is wrapped in double quotes, QDoc will remove them before
2019 generating output. Special characters may be replaced with the corresponding
2020 HTML entity code in QDoc's HTML output.
2021
2022 \badcode *
2023 /\1!
2024 Qt is a C++ toolkit for cross-platform GUI application development.
2025
2026 \image {happyguy.jpg} {Happy guy}
2027
2028 Qt provides single-source portability across Microsoft
2029 Windows, macOS, Linux, and all major commercial Unix
2030 variants. It is also available for embedded devices.
2031 \1/
2032 \endcode
2033
2034 See also \l {inlineimage-command} {\\inlineimage} and \l
2035 {caption-command} {\\caption}.
2036
2037 \target inlineimage-command
2038 \section1 \\inlineimage
2039
2040 The \\inlineimage command expands to the image specified by its
2041 argument. The image is rendered inline with the rest of the text.
2042
2043 The command takes two arguments. The first argument is the name of
2044 the image file. The second argument is optional and is a simple
2045 description of the image within braces {}, equivalent to the HTML
2046 alt="" in an image tag. The description is used for tooltips, and
2047 for when a browser doesn't support images, like the Lynx text browser.
2048
2049 The most common use of the \\inlineimage command is in lists and
2050 tables. Here is an example of including inline images in a list:
2051
2052 \badcode *
2053 /\1!
2054 \list 1
2055 \li \inlineimage happy.gif {Oh so happy, I am a caption!}
2056 \li \inlineimage happy.gif Oh so happy, but I'm not a caption.
2057 \endlist
2058 \1/
2059 \endcode
2060
2061 Here is an example of including inline images in a table:
2062
2063 \badcode *
2064 /\1!
2065 \table
2066 \header
2067 \li Qt
2068 \li Qt Creator
2069 \row
2070 \li \inlineimage happy.gif {Oh so happy!}
2071 \li \inlineimage happy.gif Oh so happy!
2072 \row
2073 \li \inlineimage happy.gif Oh so happy!
2074 \li \inlineimage happy.gif {Oh so happy!}
2075 \endtable
2076 \1/
2077 \endcode
2078
2079 The command can also be used to insert an image inline with the
2080 text.
2081
2082 \badcode *
2083 /\1!
2084 \inlineimage training.jpg {Qt Training} The Qt Programming course is
2085 offered as a five day Open Enrollment Course. The classes are open to
2086 the public. Although the course is open to anyone who wants to learn,
2087 attendees should have significant experience in C++ development to
2088 derive maximum benefit from the course.
2089 \1/
2090 \endcode
2091
2092 See also \l {image-command} {\\image} and \l {caption-command} {\\caption}.
2093
2094 \target caption-command
2095 \section1 \\caption
2096
2097 The \\caption command provides a caption for an image.
2098
2099 The command takes all the text up to the end of the paragraph to
2100 be the caption. Experiment until you get the effect you want.
2101
2102 \badcode *
2103 /\1!
2104 \table 100%
2105 \row
2106 \li \image windows-pushbutton.png
2107 \caption The QPushButton widget provides a command button.
2108 \li \image windows-toolbutton.png
2109 \caption The QToolButton class provides a quick-access button to commands
2110 or options, usually used inside a QToolBar.
2111 \endtable
2112 \1/
2113 \endcode
2114
2115 See also \l {image-command} {\\image} and \l {inlineimage-command}
2116 {\\inlineimage}
2117*/
2118
2119
2120/*!
2121 \page 10-qdoc-commands-tablesandlists.html
2122 \previouspage Including Images
2123 \nextpage Special Content
2124
2125 \title Tables and Lists
2126
2127 These commands enable creating lists and tables. A list is
2128 rendered left aligned as a separate paragraph. A table is rendered
2129 centered as a separate paragraph. The table width depends on the
2130 width of its contents.
2131
2132 \target table-command
2133 \section1 \\table
2134
2135 The \\table and \\endtable commands delimit the contents of a
2136 table.
2137
2138 The command accepts a single argument specifying the table's width
2139 as a percentage of the page width:
2140
2141 \badcode *
2142 /\1!
2143 \table 100%
2144
2145 ...
2146
2147 \endtable
2148 \1/
2149 \endcode
2150
2151 The code above ensures that the table will fill all available
2152 space. If the table's width is smaller than 100 %, the table will
2153 be centered in the generated documentation.
2154
2155 A table can contain headers, rows and columns. A row starts with a
2156 \l {row-command} {\\row} command and consists of cells, each of which
2157 starts with an \l {li-command} {\\li} command. There is also a \l
2158 {header-command} {\\header} command which is a special kind of row
2159 that has a special format.
2160
2161 \badcode *
2162 /\1!
2163 \table
2164 \header
2165 \li Qt Core Feature
2166 \li Brief Description
2167 \row
2168 \li \l {Signal and Slots}
2169 \li Signals and slots are used for communication
2170 between objects.
2171 \row
2172 \li \l {Layout Management}
2173 \li The Qt layout system provides a simple
2174 and powerful way of specifying the layout
2175 of child widgets.
2176 \row
2177 \li \l {Drag and Drop}
2178 \li Drag and drop provides a simple visual
2179 mechanism which users can use to transfer
2180 information between and within applications.
2181 \endtable
2182 \1/
2183 \endcode
2184
2185 You can also make cells span several rows and columns. For
2186 example:
2187
2188 \badcode *
2189 /\1!
2190 \table
2191 \header
2192 \li {3,1} This header cell spans three columns,
2193 but only one row.
2194 \row
2195 \li {2, 1} This table cell spans two columns,
2196 but only one row
2197 \li {1, 2} This table cell spans only one column,
2198 but two rows.
2199 \row
2200 \li A regular table cell
2201 \li A regular table cell
2202 \endtable
2203 \1/
2204 \endcode
2205
2206 See also \l {header-command} {\\header}, \l {row-command} {\\row} and \l {li-command} {\\li}.
2207
2208 \target header-command
2209 \section1 \\header
2210
2211 The \\header command indicates that the following table cells are
2212 the current table's column headers.
2213
2214 The command can only be used within the \l{table-command}
2215 {\\table...\\endtable} commands. A header can contain several
2216 cells. A cell is created with the \l {li-command} {\\li} command.
2217
2218 A header cell's text is centered within the table cell and
2219 rendered using a bold font.
2220
2221 \badcode *
2222 /\1!
2223 \table
2224 \header
2225 \li Qt Core Feature
2226 \li Brief Description
2227 \row
2228 \li \l {Signal and Slots}
2229 \li Signals and slots are used for communication
2230 between objects.
2231 \endtable
2232 \1/
2233 \endcode
2234
2235 See also \l {table-command} {\\table}, \l {row-command} {\\row} and \l {li-command} {\\li}.
2236
2237 \target row-command
2238 \section1 \\row
2239
2240 The \\row command begins a new row in a table. The \l {li-command}
2241 {\\li items} that belong in the new row will immediately follow the
2242 \\row.
2243
2244 The command can only be used within the \l{table-command}
2245 {\\table...\\endtable} commands. A row can contain several
2246 cells. A cell is created with the \l {li-command} {\\li} command.
2247
2248 The background cell color of each row alternates between two
2249 shades of grey, making it easier to distinguish the rows from each
2250 other. The cells' contents is left aligned.
2251
2252 \badcode *
2253 /\1!
2254 \table
2255 \header
2256 \li Qt Core Feature
2257 \li Brief Description
2258 \row
2259 \li \l {Signal and Slots}
2260 \li Signals and slots are used for communication
2261 between objects.
2262 \row
2263 \li \l {Layout Management}
2264 \li The Qt layout system provides a simple
2265 and powerful way of specifying the layout
2266 of child widgets.
2267 \row
2268 \li \l {Drag and Drop}
2269 \li Drag and drop provides a simple visual
2270 mechanism which users can use to transfer
2271 information between and within applications.
2272 \endtable
2273 \1/
2274 \endcode
2275
2276 See also \l {table-command} {\\table}, \l {header-command}
2277 {\\header}, and \l {li-command} {\\li}.
2278
2279 \target value-command
2280 \section1 \\value
2281
2282 The \\value command starts the documentation of a C++ enum item.
2283
2284 The command's first argument is the value name. The value name may
2285 be preceded by an optional \e since clause enclosed in square
2286 brackets. The value description follows the value name. The description
2287 ends at the next blank line or \\value. The arguments are rendered in a
2288 table.
2289
2290 \note To include images in the \\value description, use the
2291 \l {inlineimage-command}{\\inlineimage} command.
2292
2293 Without a \e since clause, a \\value command could look like this:
2294
2295 \code
2296 \value QtInfoMsg A message generated by the qInfo() function.
2297 \endcode
2298
2299 The same command with a \e since clause would look like this:
2300
2301 \code
2302 \value [since 5.5] QtInfoMsg A message generated by the qInfo() function.
2303 \endcode
2304
2305 The documentation will be located in the associated class, header
2306 file or namespace documentation. See the \l {enum-command}
2307 {\\enum} documentation for an example.
2308
2309 \note Since Qt 5.4, \\value command can also be used outside the
2310 \l {enum-command} {\\enum} topic. In this case, QDoc renders a
2311 two-column table listing the constant name (taken as-is from the
2312 first argument) and its description. This can be used, for
2313 example, in \l {qmlproperty-command}{\\qmlproperty} topic for
2314 documenting acceptable values for a QML enumeration property.
2315
2316 See also \l {enum-command} {\\enum} and \l {omitvalue-command} {\\omitvalue}.
2317
2318 \target omitvalue-command
2319 \section1 \\omitvalue
2320
2321 The \\omitvalue command excludes a C++ enum item from the
2322 documentation.
2323
2324 The command's only mandatory argument is the name of the enum item
2325 that will be omitted. If the enum item is followed by a single-line
2326 description, that is also omitted.
2327
2328 See the \l {enum-command} {\\enum} documentation for an example.
2329
2330 See also \l {enum-command} {\\enum} and \l {value-command}
2331 {\\value} \l {since-command}{\\since}
2332
2333 \target list-command
2334 \section1 \\list
2335
2336 The \\list and \\endlist commands delimit a list of items.
2337
2338 Create each list item with the \l {li-command} {\\li} command. A
2339 list always contains one or more items. Lists can be nested. For
2340 example:
2341
2342 \badcode *
2343 /\1!
2344 \list
2345 \li Qt Reference Documentation: Getting Started
2346 \list
2347 \li How to Learn Qt
2348 \li Installation
2349 \list
2350 \li Qt/X11
2351 \li Qt/Windows
2352 \li Qt/Mac
2353 \li Qt/Embedded
2354 \endlist
2355 \li Tutorial and Examples
2356 \endlist
2357 \endlist
2358 \1/
2359 \endcode
2360
2361 The \\list command takes an optional argument providing
2362 alternative appearances for the list items.
2363
2364 \badcode *
2365 /\1!
2366 \list
2367 \li How to Learn Qt
2368 \li Installation
2369 \li Tutorial and Examples
2370 \endlist
2371 \1/
2372 \endcode
2373
2374 If you provide 'A' as an argument to the \\list command, the
2375 bullets are replaced with characters in alphabetical order:
2376
2377 \list A
2378 \li How to Learn Qt
2379 \li Installation
2380 \li Tutorial and Examples
2381 \endlist
2382
2383 If you replace 'A' with '1', the list items are numbered in
2384 ascending order:
2385
2386 \list 1
2387 \li How to Learn Qt
2388 \li Installation
2389 \li Tutorial and Examples
2390 \endlist
2391
2392 If you provide 'i' as the argument, the bullets are replaced with
2393 roman numerals:
2394
2395 \list i
2396 \li How to Learn Qt
2397 \li Installation
2398 \li Tutorial and Examples
2399 \endlist
2400
2401 Finally, you can make the list items appear with roman numbers
2402 following in ascending order if you provide 'I' as the optional
2403 argument:
2404
2405 \list I
2406 \li How to Learn Qt
2407 \li Installation
2408 \li Tutorial and Examples
2409 \endlist
2410
2411 You can also make the listing start at any character or number by
2412 simply provide the number or character you want to start at. For
2413 example:
2414
2415 \badcode *
2416 /\1!
2417 \list G
2418 \li How to Learn Qt
2419 \li Installation
2420 \li Tutorial and Examples
2421 \endlist
2422 \1/
2423 \endcode
2424
2425 See also \l {li-command} {\\li}.
2426
2427 \target li-command
2428 \section1 \\li (table cell, list item)
2429
2430 The \\li command marks a table cell or a list item. This command
2431 is only used in \l{table-command} {tables} and \l{list-command}
2432 {lists}.
2433
2434 It considers everything as its argument until the next \\li command, until the
2435 next \l {table-command} {\\endtable}, or \l {list-command} {\\endlist}
2436 command. See \l {table-command} {\\table} and \l {list-command} {\\list}
2437 for examples.
2438
2439 If the command is used within a table, you can also specify
2440 how many rows or columns the item should span.
2441
2442 \badcode *
2443 /\1!
2444 \table
2445 \header
2446 \li {3,1} This header cell spans three columns
2447 but only one row.
2448 \row
2449 \li {2, 1} This table item spans two columns
2450 but only one row
2451 \li {1, 2} This table item spans only one column,
2452 but two rows.
2453 \row
2454 \li A regular table item
2455 \li A regular table item
2456 \endtable
2457 \1/
2458 \endcode
2459
2460 If not specified, the item will span one column and one row.
2461
2462 See also \l {table-command} {\\table}, \l {header-command}
2463 {\\header}, and \l {list-command} {\\list}.
2464
2465*/
2466
2467
2468/*!
2469 \page 11-qdoc-commands-specialcontent.html
2470 \previouspage Tables and Lists
2471 \nextpage Miscellaneous
2472
2473 \title Special Content
2474
2475 The document contents commands identify parts of the documentation,
2476 parts with a special rendering, conceptual meaning or
2477 function.
2478
2479 \target quotation-command
2480 \section1 \\quotation
2481
2482 The \\quotation and \\endquotation commands delimit a long quotation.
2483
2484 The text in the delimited block is surrounded by
2485 \b{<blockquote>} and \b{</blockquote>} in the html output,
2486 e.g.:
2487
2488 \badcode *
2489 /\1!
2490 Although the prospect of a significantly broader market is
2491 good news for Firstlogic, the notion also posed some
2492 challenges. Dave Dobson, director of technology for the La
2493 Crosse, Wisconsin-based company, said:
2494
2495 \quotation
2496 As our solutions were being adopted into new
2497 environments, we saw an escalating need for easier
2498 integration with a wider range of enterprise
2499 applications.
2500 \endquotation
2501 \1/
2502 \endcode
2503
2504 The text in the \b{\\quotation} block will appear in the generated HTML as:
2505
2506 \badcode
2507 <blockquote>
2508 <p>As our solutions were being adopted into new environments,
2509 we saw an escalating need for easier integration with a wider
2510 range of enterprise applications.</p>
2511 </blockquote>
2512 \endcode
2513
2514 The built-in style sheet for most browsers will render the
2515 contents of the <blockquote> tag with left and right
2516 indentations. The example above would be rendered as:
2517
2518 \quotation
2519 As our solutions were being adopted into new
2520 environments, we saw an escalating need for easier
2521 integration with a wider range of enterprise
2522 applications.
2523 \endquotation
2524
2525 But you can redefine the \b{<blockquote>} tag in your style.css file.
2526
2527
2528 \target note-command
2529 \section1 \\note
2530
2531 The \\note command defines a new paragraph preceded by "Note:"
2532 in bold. The command takes a continuous paragraph as the argument,
2533 terminating after the end of the paragraph. The note command is only for
2534 shorter statements and not for longer multiline paragraphs.
2535
2536 Similar to the \l{warning-command}{\\warning} command, the note is for
2537 short and important statements. See
2538 \l{https://wiki.qt.io/Qt_Writing_Guidelines}{Qt Writing Guidelines} for
2539 usage information.
2540
2541 \target notranslate-command
2542 \section1 \\notranslate
2543
2544 The \\notranslate command indicates that its argument is \b not to be translated,
2545 when the generated output is passed to a language translation service.
2546
2547 Other commands (\qdoccmd {c}, \qdoccmd {tt}) have the same effect, but
2548 \\notranslate does not style its argument in any way.
2549
2550 This command was introduced in QDoc version 6.10.
2551
2552 \target brief-command
2553 \section1 \\brief
2554
2555 The \\brief command introduces a one-sentence description of
2556 any of the \l{Topic Commands}.
2557
2558 The brief text is used to introduce the documentation of the
2559 associated object, and in lists generated using the \l
2560 {generatelist-command} {\\generatelist} command and the \l
2561 {annotatedlist-command} {\\annotatedlist} command.
2562
2563 The brief text will be displayed in the documentation
2564 for that particular topic.
2565
2566 For example the boolean QWidget::isWindow property:
2567
2568 \badcode *
2569 /\1!
2570 \property QWidget::isActiveWindow
2571 \brief Whether this widget's window is the active window.
2572
2573 The active window is the window that contains the widget that
2574 has keyboard focus.
2575
2576 When popup windows are visible, this property is \c true
2577 for both the active window \e and the popup.
2578
2579 \sa activateWindow(), QApplication::activeWindow()
2580 \1/
2581 \endcode
2582
2583 and the QWidget::geometry property
2584
2585 \badcode *
2586 /\1!
2587 \property QWidget::geometry
2588 \brief The geometry of the widget relative to its parent and
2589 excluding the window frame.
2590
2591 When changing the geometry, the widget, if visible,
2592 receives a move event (moveEvent()) and/or a resize
2593 event (resizeEvent()) immediately.
2594
2595 ...
2596
2597 \sa frameGeometry(), rect(), ...
2598 \1/
2599 \endcode
2600
2601 When the \\brief command is used to describe a class, we recommend
2602 using a complete sentence like this:
2603
2604 \badcode
2605 The <classname> class is|provides|contains|specifies...
2606 \endcode
2607
2608 \warning Do not repeat your detailed description with the same sentence as
2609 the brief statement will be the first paragraph of the detailed
2610 description.
2611
2612 \badcode *
2613 /\1!
2614 \class PreviewWindow
2615 \brief The PreviewWindow class is a custom widget
2616 displaying the names of its currently set
2617 window flags in a read-only text editor.
2618
2619 The PreviewWindow class inherits QWidget. The widget
2620 displays the names of its window flags set with the
2621 setWindowFlags() function. It is also provided with a
2622 QPushButton that closes the window.
2623
2624 ...
2625
2626 \sa QWidget
2627 \1/
2628 \endcode
2629
2630 Using \\brief in a \l{namespace-command}{\\namespace}:
2631
2632 \badcode *
2633 /\1!
2634 \namespace Qt
2635
2636 \brief The Qt namespace contains miscellaneous identifiers
2637 used throughout the Qt library.
2638 \1/
2639 \endcode
2640
2641 Using \\brief in a \l{headerfile-command}{\\headerfile}:
2642
2643 \badcode *
2644 /\1!
2645 \headerfile <QtGlobal>
2646 \title Global Qt Declarations
2647
2648 \brief The <QtGlobal> header file provides basic
2649 declarations and is included by all other Qt headers.
2650
2651 \sa <QtAlgorithms>
2652 \1/
2653 \endcode
2654
2655 See also \l{property-command} {\\property}, \l{class-command}
2656 {\\class}, \l{namespace-command} {\\namespace} and
2657 \l{headerfile-command} {\\headerfile}.
2658
2659 \target legalese-command
2660 \section1 \\legalese
2661
2662 The \\legalese and \\endlegalese commands delimit a license agreement.
2663
2664 In the generated HTML, the delimited text is surrounded by a \b
2665 {<div class="LegaleseLeft">} and \b {</div>} tags.
2666
2667 An example of a license agreement enclosed in \\legalese
2668 and \\endlegalese:
2669
2670 \badcode *
2671 /\1!
2672 \legalese
2673 Copyright 1996 Daniel Dardailler.
2674
2675 Permission to use, copy, modify, distribute, and sell this
2676 software for any purpose is hereby granted without fee,
2677 provided that the above copyright notice appear in all
2678 copies and that both that copyright notice and this
2679 permission notice appear in supporting documentation, and
2680 that the name of Daniel Dardailler not be used in
2681 advertising or publicity pertaining to distribution of the
2682 software without specific, written prior permission. Daniel
2683 Dardailler makes no representations about the suitability of
2684 this software for any purpose. It is provided "as is"
2685 without express or implied warranty.
2686
2687 Modifications Copyright 1999 Matt Koss, under the same
2688 license as above.
2689 \endlegalese
2690 \1/
2691 \endcode
2692
2693 It will appear in the generated HTML as:
2694
2695 \badcode
2696 <div class="LegaleseLeft">
2697 <p>Copyright 1996 Daniel Dardailler.</p>
2698 <p>Permission to use, copy, modify, distribute, and sell
2699 this software for any purpose is hereby granted without fee,
2700 provided that the above copyright notice appear in all
2701 copies and that both that copyright notice and this
2702 permission notice appear in supporting documentation, and
2703 that the name of Daniel Dardailler not be used in
2704 advertising or publicity pertaining to distribution of the
2705 software without specific, written prior permission. Daniel
2706 Dardailler makes no representations about the suitability of
2707 this software for any purpose. It is provided "as is"
2708 without express or implied warranty.</p>
2709
2710 <p>Modifications Copyright 1999 Matt Koss, under the same
2711 license as above.</p>
2712 </div>
2713 \endcode
2714
2715 If the \\endlegalese command is omitted, QDoc will process the
2716 \\legalese command but considers the rest of the documentation
2717 page as the license agreement.
2718
2719 Ideally, the license text is located with the licensed code.
2720
2721 Elsewhere, the documentation identified as \e{\\legalese} command
2722 can be accumulated using \l {generatelist-command} {\\generatelist}
2723 with \c {legalese} as the argument. This is useful for generating
2724 an overview of the license agreements associated with the source
2725 code.
2726
2727 \note The output of the \c {\generatelist legalese} command includes
2728 the \\legalese texts in the current documentation project only. If
2729 the current documentation project depends on other modules, their
2730 license texts will not be listed.
2731
2732 \target warning-command
2733 \section1 \\warning
2734
2735 The \\warning command prepends "Warning:" to the command's
2736 argument, in bold font.
2737
2738 \badcode *
2739 /\1!
2740 Qt::HANDLE is a platform-specific handle type
2741 for system objects. This is equivalent to
2742 \c{void *} on Windows and macOS, and to
2743 \c{unsigned long} on X11.
2744
2745 \warning Using this type is not portable.
2746 \1/
2747 \endcode
2748*/
2749
2750
2751/*!
2752 \page 12-0-qdoc-commands-miscellaneous.html
2753 \previouspage Special Content
2754 \nextpage The QDoc Configuration File
2755
2756 \title Miscellaneous
2757
2758 These commands provide miscellaneous functions connected to the
2759 visual appearance of the documentation, and to the process of
2760 generating the documentation.
2761
2762 \target annotatedlist-command
2763 \section1 \\annotatedlist
2764
2765 The \\annotatedlist command expands to a list of the members of a
2766 group, each member listed with its \e {brief} text. Below is an
2767 example from the Qt Reference Documentation:
2768
2769 \badcode *
2770 /\1!
2771 ...
2772 \section1 Drag and Drop Classes
2773
2774 These classes deal with drag and drop and the necessary mime type
2775 encoding and decoding.
2776
2777 \annotatedlist draganddrop
2778 \1/
2779 \endcode
2780
2781 This generates a list of all the C++ classes and/or QML types in
2782 the \e{draganddrop} group. A C++ class or QML type in the
2783 \e{draganddrop} group will have \e{\\ingroup draganddrop} in its
2784 \e{\\class} or \e{\\qmltype} comment.
2785
2786 The group members are sorted in ascending order, based on
2787 user-visible name or title. Since QDoc 6.8, \\annotatedlist
2788 and \qdoccmd generatelist support also custom sorting.
2789
2790 See also \qdoccmd generatelist and \l {Sorting group members}.
2791
2792 \target cmakepackage-command
2793 \section1 \\cmakepackage
2794
2795 Use the \\cmakepackage command to add CMake package information to classes
2796 and namespaces. This information will then appear in a table at the top of
2797 the class or namespace documentation page. For example:
2798
2799 \badcode *
2800 /*!
2801 \namespace Foo
2802 \inheaderfile Bar
2803 \cmakepackage Baz
2804 \brief A namespace.
2805
2806 ...
2807 \1/
2808 \endcode
2809
2810 QDoc will output this as
2811
2812 \quotation
2813 \raw HTML
2814 <h1 class="title">Foo Namespace</h1>
2815 <p>A namespace. <a>More...</a></p>
2816 <div class="table"><table class="alignedsummary">
2817 <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include &lt;Bar&gt;</span></td></tr>
2818 <tr><td class="memItemLeft rightAlign topAlign"> CMake:</td><td class="memItemRight bottomAlign"> find_package(Baz REQUIRED)<br/>target_link_libraries(mytarget PRIVATE Baz::Baz)</td></tr>
2819 </table></div>
2820 \endraw
2821 \endquotation
2822
2823 \e{See also} \l{module-command}{\\module} and
2824 \l{cmakecomponent}{\\cmakecomponent}}
2825
2826 \target cmakecomponent-command
2827 \section1 \\cmakecomponent
2828
2829 Use the \\cmakecomponent command to add CMake component information to classes
2830 and namespaces. This information will then appear in a table at the top of
2831 the class or namespace documentation page. For example:
2832
2833 \badcode *
2834 /*!
2835 \namespace Foo
2836 \inheaderfile Bar
2837 \cmakecomponent Baz
2838 \brief A namespace.
2839
2840 ...
2841 \1/
2842 \endcode
2843
2844 QDoc will output this as
2845
2846 \quotation
2847 \raw HTML
2848 <h1 class="title">Foo Namespace</h1>
2849 <p>A namespace. <a>More...</a></p>
2850 <div class="table"><table class="alignedsummary">
2851 <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include &lt;Bar&gt;</span></td></tr>
2852 <tr><td class="memItemLeft rightAlign topAlign"> CMake:</td><td class="memItemRight bottomAlign"> find_package(Qt6 REQUIRED COMPONENTS Baz)<br/>target_link_libraries(mytarget PRIVATE Qt6::Baz)</td></tr>
2853 </table></div>
2854 \endraw
2855 \endquotation
2856
2857 \e{See also} \l{module-command}{\\module} and
2858 \l{cmakepackage}{\\cmakepackage}}
2859
2860 \target cmaketargetitem-command
2861 \section1 \\cmaketargetitem
2862
2863 Use the \\cmaketargetitem command to override the \e {item} part of the
2864 CMake \c{target_link_libraries} information that's added to classes and
2865 namespaces. The command must be used in conjunction with the
2866 \l{module-command}{\\module} and \l{cmakecomponent}{\\cmakecomponent}
2867 commands. For example:
2868
2869 \badcode *
2870 /*!
2871 \namespace Foo
2872 \inheaderfile Bar
2873 \cmakecomponent Baz
2874 \cmaketargetitem Qt6::BazPrivate
2875 \brief A namespace.
2876
2877 ...
2878 \1/
2879 \endcode
2880
2881 QDoc will output this as
2882
2883 \quotation
2884 \raw HTML
2885 <h1 class="title">Foo Namespace</h1>
2886 <p>A namespace. <a>More...</a></p>
2887 <div class="table"><table class="alignedsummary">
2888 <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include &lt;Bar&gt;</span></td></tr>
2889 <tr><td class="memItemLeft rightAlign topAlign"> CMake:</td><td class="memItemRight bottomAlign"> find_package(Qt6 REQUIRED COMPONENTS Baz)<br/>target_link_libraries(mytarget PRIVATE Qt6::BazPrivate)</td></tr>
2890 </table></div>
2891 \endraw
2892 \endquotation
2893
2894 \e{See also} \l{module-command}{\\module} and
2895 \l{cmakecomponent}{\\cmakecomponent}}
2896
2897
2898 \target qtcmakepackage-command
2899 \section1 \\qtcmakepackage
2900
2901 Use the \\qtcmakepackage command to add CMake package information to classes
2902 and namespaces. This information will then appear in a table at the top of
2903 the class or namespace documentation page. For example:
2904
2905 \badcode *
2906 /*!
2907 \namespace Foo
2908 \inheaderfile Bar
2909 \qtcmakepackage Baz
2910 \brief A namespace.
2911
2912 ...
2913 \1/
2914 \endcode
2915
2916 QDoc will output this as
2917
2918 \quotation
2919 \raw HTML
2920 <h1 class="title">Foo Namespace</h1>
2921 <p>A namespace. <a>More...</a></p>
2922 <div class="table"><table class="alignedsummary">
2923 <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include &lt;Bar&gt;</span></td></tr>
2924 <tr><td class="memItemLeft rightAlign topAlign"> CMake:</td><td class="memItemRight bottomAlign"> find_package(Qt6 REQUIRED COMPONENTS Baz)</td></tr>
2925 </table></div>
2926 \endraw
2927 \endquotation
2928
2929
2930 \target qtcmaketargetitem-command
2931 \section1 \\qtcmaketargetitem
2932
2933 Use the \\qtcmaketargetitem command to override the \e {item} part of the
2934 CMake \c{target_link_libraries} information that's added to classes and
2935 namespaces. The command must be used in conjunction with the
2936 \l{module-command}{\\module} and \l{qtcmakepackage}{\\qtcmakepackage}
2937 commands.
2938
2939 \e{See also} \l{module-command}{\\module} and
2940 \l{qtcmakepackage}{\\qtcmakepackage}}
2941
2942
2943 \target generatelist-command
2944 \section1 \\generatelist
2945
2946 The \\generatelist command expands to a list of links to the
2947 documentation entities grouped with an \l {ingroup-command}
2948 {\\ingroup} command or entities that match one of the arguments
2949 listed below. An example from the Qt Reference Documentation:
2950
2951 \badcode *
2952 /\1!
2953 \page classes.html
2954 \title All Classes
2955
2956 For a shorter list that only includes the most
2957 frequently used classes, see \l{Qt's Main Classes}.
2958
2959 \generatelist classes Q
2960 \1/
2961 \endcode
2962
2963 This generates the \e {All Classes} page. The command accepts the
2964 following arguments:
2965
2966 \section2 \c {<group-name>}
2967
2968 With a group name as the only argument, QDoc lists all entities that
2969 use the \c {\ingroup <group-name>} command.
2970
2971 \section3 Sorting group members
2972
2973 When generating a list of group members, they are sorted in ascending
2974 order, based on user-visible name or title. Since QDoc 6.8, the default
2975 sort order can be modified:
2976
2977 \badcode
2978 \generatelist [descending] changelogs
2979 \endcode
2980
2981 Assuming the \e changelogs group consists of pages
2982 detailing changes in different versions, this generates the
2983 list in descending order (newest version first).
2984
2985 \section4 Sort key
2986
2987 Since QDoc 6.8, a custom sort key can be assigned to one or
2988 more group members using the \qdoccmd meta command:
2989
2990 \badcode
2991 \meta sortkey {sort key}
2992 \endcode
2993
2994 Sorting (ascending or descending) is then done based on
2995 these key(s), rather than user-visible titles.
2996
2997 \note Any group member with a sort key is listed \e before
2998 members without a key (in the default ascending order). This
2999 allows raising individual group member(s) to the top of the
3000 list.
3001
3002 \target table example
3003 \section2 \c annotatedclasses
3004
3005 The \c annotatedclasses argument provides a table containing the
3006 names of all the classes, and a description of each class. Each
3007 class name is a link to the class's reference documentation. For
3008 example:
3009
3010 \table
3011 \row
3012 \li QDial
3013 \li Rounded range control (like a speedometer or potentiometer)
3014 \row
3015 \li QDialog
3016 \li The base class of dialog windows
3017 \row
3018 \li QDir
3019 \li Access to directory structures and their contents
3020 \endtable
3021
3022 A C++ class is documented with the \l {class-command} {\\class}
3023 command. The annotation for the class is taken from the argument
3024 of the class comment's \l {brief-command} {\\brief} command.
3025
3026 \section2 \c annotatedexamples
3027
3028 The \c annotatedexamples argument provides a complete list of all
3029 examples as a set of tables containing the titles of all the
3030 examples, and a description of each example. Each title is a
3031 link to the example's documentation.
3032
3033 A separate table for each module (that has documented examples)
3034 is generated, provided that the module has defined a
3035 navigation.landingpage configuration variable. The \e landingpage
3036 variable is used as a title for a header that precedes each table.
3037
3038 \section2 \c annotatedattributions
3039
3040 The \c annotatedattributions argument provides a complete list of all
3041 attributions as a set of tables containing the titles of all the
3042 attributions, and a description of each attribution. Each title is a
3043 link to the attribution's page.
3044
3045 A separate table for each module (that has attributions)
3046 is generated, provided that the module has defined a
3047 navigation.landingpage configuration variable. The \e landingpage
3048 variable is used as a title for a header that precedes each table.
3049
3050 \target list example
3051 \section2 \c {classes <prefix>}
3052
3053 The \c classes argument provides a complete alphabetical list of
3054 the classes. The second argument, \c{<prefix>}, is the common
3055 prefix for the class names. The class names will be sorted on the
3056 character that follows the common prefix. e.g. The common prefix
3057 for the Qt classes is \c Q. The common prefix argument is
3058 optional. If no common prefix is provided, the class names will
3059 be sorted on their first character.
3060
3061 Each class name becomes a link to the class's reference
3062 documentation. This command is used to generate the
3063 \e {All Classes} page this way:
3064
3065 \badcode *
3066 /\1!
3067 \page classes.html
3068 \title All Classes
3069 \ingroup classlists
3070
3071 \brief Alphabetical list of classes.
3072
3073 This is a list of all Qt classes. For classes that
3074 have been deprecated, see the \l{Obsolete Classes}
3075 list.
3076
3077 \generatelist classes Q
3078 \1/
3079 \endcode
3080
3081 A C++ class is documented with the \l {class-command} {\\class}
3082 command.
3083
3084 \section2 \c classesbymodule
3085
3086 When this argument is used, a second argument is required, which
3087 specifies the module whose classes are to be listed. QDoc
3088 generates a table containing those classes. Each class is listed
3089 with the text of its \l{brief-command} {\\brief} command.
3090
3091 For example, this command can be used on a module page as follows:
3092
3093 \badcode *
3094 /\1!
3095 \page phonon-module.html
3096 \module Phonon
3097 \title Phonon Module
3098 \ingroup modules
3099
3100 \brief Contains namespaces and classes for multimedia functionality.
3101
3102 \generatelist{classesbymodule Phonon}
3103
3104 ...
3105 \1/
3106 \endcode
3107
3108 Each class that is a member of the specified module must be marked
3109 with the \l {inmodule-command} {\\inmodule} command in its \\class
3110 comment.
3111
3112 \section2 \c qmltypesbymodule
3113
3114 Similar to \c classesbymodule argument, but used for listing the
3115 QML types (excluding QML value types) from the QML module specified
3116 with the second argument.
3117
3118 \note Support for this argument was introduced in QDoc 5.6.
3119
3120 \section2 \c qmlvaluetypesbymodule
3121
3122 Similar to \c qmltypesbymodule argument, but lists QML value
3123 types instead.
3124
3125 \note Support for this argument was introduced in QDoc 6.7.
3126
3127 \section2 \c functionindex
3128
3129 The \c functionindex argument provides a complete alphabetical
3130 list of all the documented member functions. It is normally used
3131 only to generate the \e {Qt function index} page
3132 this way:
3133
3134 \badcode *
3135 /\1!
3136 \page functions.html
3137 \title All Functions
3138 \ingroup funclists
3139
3140 \brief All documented Qt functions listed alphabetically with a
3141 link to where each one is declared.
3142
3143 This is the list of all documented member functions and global
3144 functions in the Qt API. Each function has a link to the
3145 class or header file where it is declared and documented.
3146
3147 \generatelist functionindex
3148 \1/
3149 \endcode
3150
3151 \section2 \c legalese
3152
3153 The \c legalese argument tells QDoc to generate a list of licenses in
3154 the current documentation project. Each license is identified using
3155 the \l {legalese-command} {\\legalese} command.
3156
3157 \section2 \c overviews
3158
3159 The \c overviews argument is used to tell QDoc to generate a list
3160 by concatenating the contents of all the \l {group-command}
3161 {\\group} pages. Qt uses it to generate the \e {overviews} page
3162 this way:
3163
3164 \badcode *
3165 /\1!
3166 \page overviews.html
3167
3168 \title All Overviews and HOWTOs
3169
3170 \generatelist overviews
3171 \1/
3172 \endcode
3173
3174 \section2 \c attributions
3175
3176 The \c attributions argument is used to tell QDoc to generate a list
3177 of attributions in the documentation.
3178
3179 \section2 \c related
3180
3181 The \c related argument is used in combination with the \l
3182 {group-command} {\\group} and \l {ingroup-command} {\\ingroup}
3183 commands to list all the overviews related to a specified
3184 group. For example, the page for the \e {Programming with Qt}
3185 page is generated this way:
3186
3187 \badcode *
3188 /\1!
3189 \group qt-basic-concepts
3190 \title Programming with Qt
3191
3192 \brief The basic architecture of the Qt cross-platform application and UI framework.
3193
3194 Qt is a cross-platform application and UI framework for
3195 writing web-enabled applications for desktop, mobile, and
3196 embedded operating systems. This page contains links to
3197 articles and overviews explaining key components and
3198 techniuqes used in Qt development.
3199
3200 \generatelist {related}
3201 \1/
3202 \endcode
3203
3204 Each page listed on this group page contains the command:
3205
3206 \code
3207 \ingroup qt-basic-concepts
3208 \endcode
3209
3210 See also \qdoccmd {annotatedlist}.
3211
3212 \target if-command
3213 \section1 \\if
3214
3215 The \\if command and the corresponding \\endif command
3216 enclose parts of a QDoc comment that only will be included if
3217 the condition specified by the command's argument is true.
3218
3219 The command reads the rest of the line and parses it as an C++ #if
3220 statement.
3221
3222 \badcode *
3223 /\1!
3224 \if defined(opensourceedition)
3225
3226 \note This edition is for the development of
3227 \l{Qt Open Source Edition} {Free and Open Source}
3228 software only; see \l{Qt Commercial Editions}.
3229
3230 \endif
3231 \1/
3232 \endcode
3233
3234 This QDoc comment will only be rendered if the \c
3235 opensourceedition preprocessor symbol is defined, and specified in
3236 the \l {defines-variable} {defines} variable in the configuration
3237 file to make QDoc process the code within #ifdef and #endif:
3238
3239 \badcode
3240 defines = opensourceedition
3241 \endcode
3242
3243 You can also define the preprocessor symbol manually on the
3244 command line. For more information see the documentation of the \l
3245 {defines-variable} {defines} variable.
3246
3247 See also \l{endif-command} {\\endif}, \l{else-command} {\\else},
3248 \l {defines-variable} {defines} and \l {falsehoods-variable}
3249 {falsehoods}.
3250
3251 \target endif-command
3252 \section1 \\endif
3253
3254 The \\endif command and the corresponding \\if command
3255 enclose parts of a QDoc comment that will be included if
3256 the condition specified by the \l {if-command} {\\if} command's
3257 argument is true.
3258
3259 For more information, see the documentation of the \l {if-command}
3260 {\\if} command.
3261
3262 See also \l{if-command} {\\if}, \l{else-command} {\\else}, \l
3263 {defines-variable} {defines} and \l {falsehoods-variable}
3264 {falsehoods}.
3265
3266 \target else-command
3267 \section1 \\else
3268
3269 The \\else command specifies an alternative if the
3270 condition in the \l {if-command} {\\if} command is false.
3271
3272 The \\else command can only be used within \l {if-command}
3273 {\\if...\\endif} commands, but is useful when there is only two
3274 alternatives.
3275
3276 \target include-command
3277 \section1 \\include
3278
3279 The \\include command sends all or part of the file specified by
3280 its first argument to the QDoc input stream to be processed as a
3281 QDoc comment snippet.
3282
3283 The command is useful when some snippet of commands or text is to
3284 be used in multiple places in the documentation. Use the \\include
3285 command wherever you want to insert a snippet into the documentation.
3286 The file containing the snippet to include, must be located under the
3287 path(s) listed in the \l{sourcedirs-variable}{sourcedirs} or
3288 \l{exampledirs-variable}{exampledirs} QDoc configuration variable.
3289 It can be either any source file parsed by QDoc (or even the same one
3290 where \\include command is used), or any other text file. To store
3291 snippets in a separate file that is not meant to be parsed by QDoc,
3292 use a file extension that is not listed in
3293 \l{sources.fileextensions-variable}{sources.fileextensions};
3294 for example, \c .qdocinc.
3295
3296 The command can have one or more arguments. The first
3297 argument is always a file name. The contents of the file must be
3298 QDoc input, in other words, a sequence of QDoc commands and text, but
3299 without the enclosing QDoc comment \c{/}\c{*!} ... \c{*}\c{/} delimiters.
3300 If you want to include the entire named file, leave the second argument
3301 empty. If you want to include only part of the file, see the
3302 \l{2-argument-form}{two argument form} below. Here is an example
3303 of the one argument form:
3304
3305 \badcode *
3306 /\1!
3307 \page corefeatures.html
3308 \title Core Features
3309
3310 \include examples/signalandslots.qdocinc
3311 \include examples/objectmodel.qdocinc
3312 \include examples/layoutmanagement.qdocinc
3313 \1/
3314 \endcode
3315
3316
3317 \target 2-argument-form
3318 \section2 \\include filename snippet-identifier
3319
3320 It is a waste of time to make a separate \c .qdocinc file for every
3321 QDoc include snippet you want to use in multiple places in the
3322 documentation, especially given that you probably have to put the
3323 copyright/license notice in every one of these files. If you
3324 have multiple snippets to be included, you can put them all in a
3325 single file and surround each one with:
3326
3327 \badcode
3328 //! [snippet-id1]
3329
3330 QDoc commands and text...
3331
3332 //! [snippet-id1]
3333
3334 //! [snippet-id2]
3335
3336 More QDoc commands and text...
3337
3338 //! [snippet-id2]
3339 \endcode
3340
3341 Then you can use the two-argument form of the command:
3342
3343 \badcode
3344 \include examples/signalandslots.qdocinc snippet-id2
3345 \include examples/objectmodel.qdocinc another-snippet-id
3346 \endcode
3347
3348 The sequence of QDoc commands and text found between the two tags
3349 with the same name as the second argument is sent to the QDoc input
3350 stream. You can even have nested snippets.
3351
3352 \note Snippet identifiers work also within documentation comment
3353 (\beginqdoc .. \endqdoc) blocks, so it's not necessary to use a
3354 separate \c .qdocinc file. When processing a comment block, QDoc
3355 removes any \c {//!} comment lines from the generated output.
3356
3357 \section2 Extra arguments
3358
3359 Since QDoc 6.3, any further arguments passed to the \\include command
3360 are used for injecting strings into the included content. To inject a
3361 string to a specific location in the content, add a backslash followed
3362 by a digit (1..9). The digits correspond with the order of the argument
3363 list. Enclose arguments in curly braces to ensure that QDoc renders the
3364 entire argument, including possible whitespace characters, as you expect.
3365
3366 \important Each additional argument (including the snippet ID) must be
3367 enclosed in braces. If you want to include the entire file,
3368 use an empty snippet ID: \c {{}}.
3369
3370 For example, given the following snippet in a file \c includes.qdocinc:
3371
3372 \badcode
3373 //! [usage]
3374 To enable \e{\1}, select \uicontrol {\2} > \uicontrol Enable.
3375 //! [usage]
3376 \endcode
3377
3378 Then, the following \\include line:
3379
3380 \badcode
3381 \include includes.qdocinc {usage} {detailed output} {Verbose}
3382 \endcode
3383
3384 Renders
3385 \quotation
3386 To enable \e {detailed output}, select \uicontrol {Verbose} >
3387 \uicontrol Enable.
3388 \endquotation
3389
3390 \target meta-command
3391 \section1 \\meta
3392
3393 The \\meta command is used for adding metadata to documentation.
3394 The command has two arguments: the first argument is the name of the
3395 metadata attribute, and the second argument is the value for the attribute.
3396 Each argument should be enclosed in curly brackets, as shown in this
3397 example:
3398
3399 \badcode *
3400 /\1!
3401 \example demos/coffee
3402 \title Coffee Machine
3403 \brief A Qt Quick application with a state-based custom user interface.
3404
3405 \meta {tags} {quick,embedded,states,touch}
3406 \meta {category} {Application Examples}
3407 \1/
3408 \endcode
3409
3410 A number of metadata attributes have a specific purpose:
3411
3412 \b {Example Metadata}
3413
3414 Another use for \\meta command is to include metadata (tags) in
3415 \l {example-command}{\\example} documentation. By default, QDoc
3416 generates example tags based on the example's \l {title-command}{\\title}
3417 and module name. These tags are displayed in Qt Creator's Welcome mode,
3418 helping users navigate the list of examples.
3419
3420 Additional tags can be created with \c {\meta {tag} {tag1}}
3421 or \c {\meta {tags} {tag1,[tag2,...]}}.
3422 For example:
3423
3424 \badcode *
3425 /\1!
3426 \example helloworld
3427 \title Hello World Example
3428 \meta {tags} {tutorial,basic}
3429 \1/
3430 \endcode
3431
3432 This would result in the following tags: \e {tutorial,basic,hello,world}.
3433 Common words such as \e example are ignored.
3434
3435 \b {Excluding Examples}
3436
3437 Marking an example \e broken will exclude it from the generated manifest
3438 file, effectively removing it from Qt Creator's Welcome mode.
3439
3440 \badcode
3441 \meta {tag} {broken}
3442 \endcode
3443
3444 \b {Example Install Paths}
3445
3446 The \\meta command combined with an argument \c installpath specifies the
3447 location of an installed example. This value overrides the one that is set
3448 using the \c examplesinstallpath configuration variable.
3449
3450 \badcode *
3451 /\1!
3452 \example helloworld
3453 \title Hello World Example
3454 \meta {installpath} {tutorials}
3455 \1/
3456 \endcode
3457
3458 See also \l {examplesinstallpath}.
3459
3460 \b {Status}
3461
3462 A \c status argument for the \\meta command adds a custom status description
3463 for a \l {class-command}{\\class} or a \l {qmltype-command}{\\qmltype}. This
3464 description will then appear in a table at the top of the type reference page.
3465
3466 \badcode *
3467 /\1!
3468 \class QNativeInterface::QAndroidApplication
3469 \meta {status} {Android-specific}
3470 \1/
3471 \endcode
3472
3473 See also \l {Status}{status-related commands}.
3474
3475 \b {Document metadata}
3476
3477 A \c keywords argument for the \\meta command adds specified keywords
3478 as metadata for the generated document:
3479
3480 \code [text]
3481 \meta {keywords} {reference, internal}
3482 \endcode
3483
3484 In HTML output, these keywords are generated as a
3485 \c {<meta name="keywords" content="...">} element.
3486
3487 \target noautolist-command
3488 \section1 \\noautolist
3489
3490 The \\noautolist command indicates that the annotated list of C++
3491 classes or QML types, which is automatically generated at the
3492 bottom of the C++ or QML module page should be omitted, because
3493 the classes or types have been listed manually. This command can
3494 also be used with the \l {group-command}{\\group} command to omit
3495 the list of group members, when they are listed manually.
3496
3497 The command must stand on its own line. See \l {Qt Quick Controls QML Types}
3498 for an example. The page is generated from \c {qtquickcontrols2-qmlmodule.qdoc}.
3499 There you will find a QDoc comment containing the \c{\qmlmodule} command for
3500 the QtQuick.Controls module. The same comment contains a \c {\noautolist}
3501 command to disable automatic list generation, and a \l {generatelist-command}
3502 {\\generatelist} to list the QML types in a specific section of the document.
3503
3504 This command was introduced in QDoc 5.6.
3505
3506 Since Qt 5.10, this command can be applied also to \l{example-command}
3507 {\\example} documentation, where it causes the automatically generated
3508 list of files and images belonging to an example project to be omitted.
3509
3510 \target omit-command
3511 \section1 \\omit
3512
3513 The \\omit command and the corresponding \\endomit command
3514 delimit parts of the documentation that you want QDoc to skip. For
3515 example:
3516
3517 \badcode *
3518 /\1!
3519 \table
3520 \row
3521 \li Basic Widgets
3522 \li Basic GUI widgets such as buttons, comboboxes
3523 and scrollbars.
3524
3525 \omit
3526 \row
3527 \li Component Model
3528 \li Interfaces and helper classes for the Qt
3529 Component Model.
3530 \endomit
3531
3532 \row
3533 \li Database Classes
3534 \li Database related classes, e.g. for SQL databases.
3535 \endtable
3536 \1/
3537 \endcode
3538
3539 \target raw-command
3540 \section1 \\raw (avoid!)
3541
3542 The \\raw command and the corresponding
3543 \\endraw command delimit a block of raw mark-up language code.
3544
3545 \warning Avoid using this command if possible. If you are trying to
3546 generate special table or list behavior, try to get the behavior you want
3547 using the \l {span-command} {\\span} and \l {div-command} {\\div}
3548 commands in your \l {table-command} {\\table} or \l {list-command}
3549 {\\list}.
3550
3551 The command takes an argument specifying the code's format.
3552
3553 QDoc generates the given code only when generating the format that
3554 was specified by the user.
3555
3556 For example, "\\raw HTML" will only generate code when QDoc
3557 generates HTML documentation.
3558
3559 \note You can often achieve the intended purpose by using QDoc commands,
3560 while reducing the chance of mistakes or content becoming unmaintained.
3561
3562 \target sincelist-command
3563 \section1 \\sincelist
3564
3565 The \\sincelist command expands to a detailed breakdown of new
3566 inclusions to the documented API in a specified version. Example
3567 usage:
3568
3569 \badcode * \QtMajorVersion \QtMinorVersion \QtVer
3570 /\1!
3571 \page newclasses\2\3.html
3572 \title New Classes and Functions in \4
3573 \brief A comprehensive list of new classes and functions in \4.
3574
3575 \sincelist \4
3576 \1/
3577 \endcode
3578
3579 \\sincelist takes a single argument, a version string. The generated
3580 output includes all functionality that is marked with a
3581 \l {since-command}{\\since} command or a \l {since clause} matching
3582 the version string.
3583
3584 \target unicode-command
3585 \section1 \\unicode
3586
3587 The \\unicode command allows you to insert an arbitrary Unicode
3588 character in the document.
3589
3590 The command takes an argument specifying the character as an
3591 integer. By default, base 10 is assumed, unless a '0x' or '0'
3592 prefix is specified (for base 16 and 8, respectively).
3593*/