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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 For example, the following documentation references a snippet in a
1366 file residing in a subdirectory of the documentation directory:
1367
1368 \code
1369 \snippet snippets/textdocument-resources/main.cpp Adding a resource
1370 \endcode
1371
1372 The text following the file name is the unique identifier for the
1373 snippet. This is used to delimit the quoted code in the relevant
1374 snippet file, as shown in the following example that corresponds to
1375 the above \c{\snippet} command:
1376
1377 \code
1378 ...
1379 QImage image(64, 64, QImage::Format_RGB32);
1380 image.fill(qRgb(255, 160, 128));
1381
1382//! [Adding a resource]
1383 document->addResource(QTextDocument::ImageResource,
1384 QUrl("mydata://image.png"), QVariant(image));
1385//! [Adding a resource]
1386 ...
1387 \endcode
1388
1389 By default, QDoc looks for \c{//!} as a code snippet marker.
1390 For \c{.pro}, \c{.py}, \c{.cmake}, and \c{CMakeLists.txt}
1391 files, \c {#!} is detected. Finally, \c{<!--} is accepted in
1392 \c{.html}, \c{.qrc}, \c{.ui}, \c{.xml}, and \c{.xq} files.
1393
1394 QDoc normalizes snippet indentation by comparing the snippet-marker's
1395 space-based indentation against the snippet's minimum content indentation
1396 (ignoring Qt-macros, blank lines, and full-line comments). It then
1397 automatically un-indents the snippet body to whichever is smaller,
1398 ensuring the generated code always preserves its natural structure
1399 regardless of where the markers sit. Under-indented markers are left
1400 untouched.
1401
1402 \note QDoc only handles space characters for indentation normalization,
1403 not tabs or other whitespace. For best results, use consistent space-based
1404 indentation in source files containing snippets.
1405
1406 From version 6.11, a language can be specified as an optional
1407 case-insensitive argument on the same line as the \\snippet command.
1408 This influences the quoted text in the same way as for the
1409 \l{code-command}{\\code} command.
1410
1411 This example use of the command overrides the default C++ markup style
1412 and outputs plain text instead:
1413
1414 \code [text]
1415 \snippet [text] code.cpp
1416 \endcode
1417
1418 This can be useful when quoting a language that QDoc does not have
1419 the ability to mark up, or when needing to quote from a file with an
1420 unconventional file name.
1421
1422 \target codeline-command
1423 \section1 \\codeline
1424
1425 The \\codeline command inserts a blank line of preformatted
1426 text. It is used to insert gaps between snippets without closing
1427 the current preformatted text area and opening a new one.
1428
1429*/
1430
1431
1432/*!
1433 \page 08-qdoc-commands-creatinglinks.html
1434 \previouspage Including External Code
1435 \nextpage Including Images
1436
1437 \title Creating Links
1438
1439 These commands are for creating hyperlinks to classes, functions,
1440 examples, and other targets.
1441
1442 \target l-command
1443 \section1 \\l (link)
1444
1445 The \\l link command is used to create a hyperlink to many
1446 different kinds of targets. The command's general syntax is:
1447
1448 \code
1449 \l [ link criteria ] { link target } { link text }
1450 \endcode
1451
1452 ...where the \c {link criteria} in square brackets are optional
1453 but may be required when the \c {link target} is ambiguous. See
1454 \l {Fixing Ambiguous Links} below.
1455
1456 You can use the \\l command to link to:
1457
1458 \list
1459
1460 \li an external page:
1461
1462 \badcode
1463 An URL with a custom link text:
1464 \l {https://doc.qt.io/qt-6/} {Qt 6 Documentation}.
1465
1466 An URL without a custom link text: \l {https://doc.qt.io/qt-6/}.
1467 \endcode
1468
1469 Renders as:
1470
1471 An URL with a custom link text:
1472 \l {https://doc.qt.io/qt-6/} {Qt 6 Documentation}.
1473
1474 An URL without a custom link text: \l {https://doc.qt.io/qt-6/}.
1475
1476 See also \l {externalpage-command}{\\externalpage}.
1477
1478 \li a documentation page. The link target can be:
1479
1480 \list
1481 \li the page title specified with the \l {title-command} {\\title}
1482 command:
1483
1484 \badcode
1485 Here is a link with a custom link text:
1486 \l {Getting Started with QDoc}{QDoc - Getting Started}.
1487
1488 Here is a link with a link text that is the same as the link
1489 target: \l {Getting Started with QDoc}.
1490 \endcode
1491
1492 Renders as:
1493
1494 Here is a link with a custom link text:
1495 \l {Getting Started with QDoc}{QDoc - Getting Started}.
1496
1497 Here is a link with a link text that is the same as link target:
1498 \l {Getting Started with QDoc}.
1499
1500 \li the page file name specified with the \l {page-command} {\\page}
1501 command:
1502
1503 \badcode
1504 \page 08-qdoc-commands-creatinglinks.html
1505 \title Creating Links
1506
1507 These commands are for creating hyperlinks to classes, functions,
1508 examples, and other targets.
1509
1510 ...
1511
1512 The \l {08-qdoc-commands-creatinglinks.html} {Creating Links page}
1513 explains how to create links with QDoc.
1514 \endcode
1515
1516 Renders as:
1517
1518 The \l {08-qdoc-commands-creatinglinks.html} {Creating Links page}
1519 article explains how to create links with QDoc.
1520
1521 \li the page with a \l {keyword-command} {\\keyword} command.
1522 \endlist
1523
1524 \li a particular anchor section within a document. The link target can be:
1525
1526 \list
1527 \li a section title specified with one of the
1528 \l{section-commands} {Section commands}:
1529
1530 \badcode
1531 Here is a link to a QDoc Commands section of the Writing
1532 Documentation topic:
1533 \l {Writing Documentation#QDoc Commands}{QDoc Commands}.
1534
1535 If you have unique section titles across your documentation
1536 project, you can use the section title as a target without
1537 the need to add the topic title:
1538 \l {QDoc Commands}.
1539 \endcode
1540
1541 Renders as:
1542
1543 Here is a link to a QDoc Commands section of the Writing
1544 Documentation topic:
1545 \l {Writing Documentation#QDoc Commands}{QDoc Commands}.
1546
1547 If you have unique section titles across your documentation
1548 project, you can use the section title as a target without the
1549 need to add the topic title:
1550 \l {QDoc Commands}.
1551
1552 Since the \c # character is used for the purpose of linking
1553 within documents it cannot be used verbatim when linking to
1554 titles that contain it. Instead, it must be escaped using a
1555 backslash:
1556
1557 \badcode
1558 \l {Using Qt with C\\#}
1559 \endcode
1560
1561 Two backslashes are used because QDoc will process the text
1562 before it is supplied to the link command.
1563
1564 \li an anchor defined with a \l {target-command}{\\target} command:
1565 \badcode
1566 \target assertions
1567
1568 Assertions make some statement about the text at the
1569 point where they occur in the regexp, but they do not
1570 match any characters.
1571
1572 ...
1573
1574 Regexps are built up from expressions, quantifiers, and
1575 \l {assertions} {assertions}.
1576
1577 \endcode
1578
1579 \endlist
1580
1581 \li an API item. Target links can be:
1582
1583 \list
1584 \li \c {\l QWidget} - The name of a class documented with the
1585 \l {class-command} {\\class} or
1586 \l {qmltype-command}{\\qmltype} command.
1587
1588 \li \c {\l QWidget::sizeHint()} - The signature of a function
1589 without parameters. If a matching function without
1590 parameters can't be found, the link is satisfied with the
1591 first matching function found.
1592
1593 \li \c {\l QWidget::removeAction(QAction* action)} - The
1594 signature of a function with parameters. If an exact match is
1595 not found, the link is not satisfied and QDoc reports a
1596 \e {Can't link to...} error.
1597
1598 \li \c {\l <QtGlobal>} - The subject of a \l {headerfile-command}
1599 {\\headerfile} command.
1600
1601 \endlist
1602
1603 If you only want the function name to appear in the link, you
1604 can use the following syntax: \c {\l{QWidget::}{sizeHint()}}.
1605
1606 \li an example. The target link is the example title or a relative path
1607 used in an \l {example-command} {\\example} command:
1608
1609 \badcode *
1610 /\1!
1611 \example widgets/imageviewer
1612 \title ImageViewer Example
1613 \brief Shows how to combine QLabel and QScrollArea
1614 to display an image.
1615
1616 ...
1617 \1/
1618
1619 ...
1620
1621 See the example: \l widgets/imageviewer
1622 \endcode
1623 \endlist
1624
1625 If the link target is equivalent to the link text, you can omit the second
1626 argument.
1627
1628 For example, if you have documentation like:
1629
1630 \badcode *
1631 /\1!
1632 \target assertions
1633
1634 Assertions make some statement about the text at the
1635 point where they occur in the regexp, but they do not
1636 match any characters.
1637
1638 ...
1639
1640 Regexps are built up from expressions, quantifiers, and
1641 \l {assertions} {assertions}.
1642 \1/
1643 \endcode
1644
1645 You can simplify this as follows:
1646
1647 \badcode *
1648 /\1!
1649 \target assertions
1650
1651 Assertions make some statement about the text at the
1652 point where they occur in the regexp, but they do not
1653 match any characters.
1654
1655 ...
1656
1657 Regexps are built up from expressions, quantifiers, and
1658 \l assertions.
1659 \1/
1660 \endcode
1661
1662 For the one-parameter version, the braces can often be omitted.
1663
1664 \target qdoc-automatic-linking
1665 \section2 Automatic linking
1666
1667 QDoc also tries to make a link out of any word that doesn't
1668 resemble a normal English word, for example, Qt class names or
1669 functions, like QWidget or QWidget::sizeHint(). In these cases,
1670 the \\l command can actually be omitted, but by using the command,
1671 you ensure that QDoc will emit a warning if it cannot find the
1672 link target.
1673
1674 If auto-linking produces an unwanted link for a word that
1675 happens to match a link target, you can suppress it with the
1676 \l {ignorewords-variable} {ignorewords} configuration variable.
1677
1678 \section2 Fixing Ambiguous Links
1679
1680 An ambiguous link is one that has a matching target in more than one Qt
1681 module or documentation set. For example, the same section title can appear
1682 in more than one Qt module, or the name of a C++ class in one module
1683 can also be the name of a QML type in another module.
1684 A real example in Qt is the name Qt itself: it is the name of both a C++
1685 namespace in QtCore and a QML type in QtQml.
1686
1687 Suppose we want to link to the \l {Qt} {Qt C++ namespace}. At the
1688 time QDoc generated this HTML page, that link was correct. Does
1689 it still go to the C++ namespace? Qdoc generated that link from
1690 this link command:
1691
1692 \list
1693 \li \c {\l {Qt} {Qt C++ namespace}}
1694 \endlist
1695
1696 Now suppose we want to link to the \l [QML] {Qt} {Qt QML type}.
1697 At the time QDoc generated this HTML page, that link was also
1698 correct, but we had to use this link command:
1699
1700 \list
1701 \li \c {\l [QML] {Qt} {Qt QML type}}
1702 \endlist
1703
1704 The \e {QML} in \e {square brackets} tells QDoc to accept a
1705 matching target only if the target is on a QML page. Qdoc actually
1706 finds the C++ namespace target first, but since that target is on
1707 a C++ page, QDoc ignores it and keeps looking until it finds the
1708 same target on a QML page.
1709
1710 Without the guidance in the \e{\\l command} in the optional \e
1711 {square bracket} argument, QDoc links to the first matching target
1712 it finds. QDoc can't warn that the link was ambiguous in such
1713 cases because it doesn't know that another matching target exists.
1714
1715 \section2 What arguments can appear in square brackets?
1716
1717 A link command with square bracket argument has the following syntax:
1718 \list
1719 \c {\l [QML|CPP|DOC|attached|QtModuleName] {link target} {link text}}
1720 \endlist
1721
1722 The \e {square bracket} argument is only allowed in the \c {\l
1723 (link)} command. The example above shows how \c QML is used as the
1724 \e {square brackets} argument to force QDoc to match a QML target.
1725 Most often, this will be a QML type, but it can also be a QML
1726 member function or property. Additionally, some QML types contain
1727 properties and attached properties with the same name. Attached
1728 properties can be selected with an \c attached argument.
1729 If \c attached is omitted, regular properties will be linked to
1730 in preference to attached properties with duplicate names.
1731
1732 In the example, QDoc didn't need a \e {square bracket} argument to
1733 find the Qt C++ namespace page, because that one was the first
1734 matching target QDoc found anyway. However, to force QDoc to find
1735 a C++ target when a matching QML target gets in the way, \c CPP
1736 can be used as the \e {square bracket} argument. For example, the
1737 following link will force QDoc to ignore the Qt QML type and continue
1738 searching until it matches the Qt C++ namespace.
1739
1740 \list
1741 \li \c {\l [CPP] {Qt} {Qt C++ namespace}}
1742 \endlist
1743
1744 If the link target is neither a C++ nor a QML entity, \c {DOC} can
1745 be used as the \e {square bracket} argument to prevent QDoc from
1746 matching either of those. At this writing, there were no cases of
1747 ambiguous links where using \c {DOC} was required.
1748
1749 Often, the documentor knows which Qt module the link target is
1750 in. When the module name is known, use the module name as the \e
1751 {square bracket} argument. In the example above, if we know that
1752 the QML type named Qt is located in the QtQml module, we can write
1753 the link command like this:
1754
1755 \list
1756 \li \c {\l [QtQml] {Qt} {Qt QML type}}
1757 \endlist
1758
1759 When a module name is used as the \e {square bracket} argument,
1760 QDoc will search for the link target in that module only. This
1761 makes searching for link targets more efficient.
1762
1763 Finally, the module name and entity type arguments can be
1764 combined, separated by a blank, so something like this is also
1765 allowed:
1766
1767 \list
1768 \li \c {\l [CPP QtQml] {Window} {C++ class Window}}
1769 \endlist
1770
1771 As of this writing, there were no cases where combining the two
1772 was required.
1773
1774 See also \l {sa-command} {\\sa}, \l {target-command} {\\target},
1775 and \l {keyword-command} {\\keyword}.
1776
1777
1778 \target sa-command
1779 \section1 \\sa (see also)
1780
1781 The \\sa command defines a list of links that will be rendered in
1782 a separate "See also" section at the bottom of the documentation
1783 unit.
1784
1785 The command takes a comma-separated list of links as its
1786 argument. If the line ends with a comma, you can continue
1787 the list on the next line. The general syntax is:
1788
1789 \code
1790 \sa {the first link}, {the second link},
1791 {the third link}, ...
1792 \endcode
1793
1794 QDoc will automatically try to generate "See also" links
1795 interconnecting a property's various functions. For example, a
1796 setVisible() function will automatically get a link to visible()
1797 and vice versa.
1798
1799 In general, QDoc will generate "See also" links that interconnect
1800 the functions that access the same property. It recognizes four
1801 different syntax versions:
1802
1803 \list
1804 \li \c property()
1805 \li \c setProperty()
1806 \li \c isProperty()
1807 \li \c hasProperty()
1808 \endlist
1809
1810 The \\sa command supports the same kind of links as the \l
1811 {l-command} {\\l} command.
1812
1813 \badcode *
1814 /\1!
1815 Appends the actions \a actions to this widget's
1816 list of actions.
1817
1818 \sa removeAction(), QMenu, addAction()
1819 \1/
1820 void QWidget::addActions(QList<QAction *> actions)
1821 {
1822 ...
1823 }
1824 \endcode
1825
1826 See also \l {l-command} {\\l}, \l {target-command} {\\target} and
1827 \l {keyword-command} {\\keyword}.
1828
1829
1830 \target target-command
1831 \section1 \\target
1832
1833 The \\target command names a place in the documentation that you
1834 can link to using the \l {l-command} {\\l (link)} and \l
1835 {sa-command} {\\sa (see also)} commands.
1836
1837 \e{The text up to the line break becomes the target name}. Be sure
1838 to follow the target name with a line break. Curly brackets are not
1839 required around the target name, but they may be required when the
1840 target name is used in a link command. See below.
1841
1842 \badcode *
1843 /\1!
1844 \target capturing parentheses
1845 \section1 Capturing Text
1846
1847 Parentheses allow us to group elements together so that
1848 we can quantify and capture them.
1849
1850 ...
1851 \1/
1852 \endcode
1853
1854 The target name \e{capturing parentheses} can be linked to
1855 in the following way:
1856
1857 \list
1858 \li \c {\l {capturing parentheses}}
1859 \endlist
1860
1861 Above, the target name is enclosed in brackets because it contains
1862 spaces.
1863
1864 \note The \\target command does not support \qdocvar macro expansion
1865 in its argument.
1866
1867 \section2 \\target in a \\table
1868 When you use the \\target command in a table, make sure that the
1869 \\target command follows a \l {li-command}{\\li}-command (table
1870 cell), as some generators only support targets to an individual cell,
1871 not to a whole row.
1872 Moreover, ensure that it's either on a separate line, or the last content
1873 that occurs in the line it's in. This is due to how the \\target
1874 command works; it consumes anything up to the next line break as
1875 its parameter. In other words, if you have a table and need a
1876 \\target within it, make sure that it follows the following
1877 structure:
1878
1879 \badcode
1880 \table
1881 \row
1882 \li \target my-target
1883 My text goes here.
1884 \li This is my next table cell.
1885 \endtable
1886 \endcode
1887
1888 See also \l {l-command} {\\l}, \l {sa-command} {\\sa} and \l
1889 {keyword-command} {\\keyword}.
1890
1891 \target keyword-command
1892 \section1 \\keyword
1893
1894 The \\keyword command names a place in the documentation that you
1895 can link to using the \l {l-command} {\\l (link)} and \l
1896 {sa-command} {\\sa (see also)} commands. It also adds the keyword
1897 and the location to generated indices.
1898
1899 The \\keyword command is like the \l {target-command} {\\target}
1900 command, except that when linking to a keyword, by default the link
1901 goes to the top of the QDoc comment (topic) the \\keyword appears in.
1902
1903 If you want to create a keyword for a \c section unit within a
1904 topic, add the \\keyword directly above the section title:
1905
1906 \badcode
1907 \keyword debug
1908 \section1 Debug command line option (--debug)
1909 ...
1910 \endcode
1911
1912 Unlike \\target, keywords are registered in indices of generated
1913 offline documentation files (.qch). This allows users to look up the
1914 location by keyword, for instance, in
1915 \l[QtAssistant]{Searching for Keywords}{Qt Assistant's Index Search},
1916 and makes the keyword accessible in \QC's context help.
1917
1918 Keywords must be unique over all the documents processed during
1919 the QDoc run. The command uses the rest of the line as its
1920 argument. Be sure to follow the keyword with a line break.
1921
1922
1923 \badcode *
1924 /\1!
1925 \class QRegularExpression
1926 \reentrant
1927 \brief The QRegularExpression class provides pattern
1928 matching using regular expressions.
1929 \ingroup tools
1930 \ingroup misc
1931 \ingroup shared
1932
1933 \keyword regular expression
1934
1935 Regular expressions, or "regexps", provide a way to
1936 find patterns within text.
1937
1938 ...
1939 \1/
1940 \endcode
1941
1942 The location marked with the keyword can be linked to with:
1943
1944 \badcode *
1945 /\1!
1946 When a string is surrounded by slashes, it is
1947 interpreted as a \l {regular expression}.
1948 \1/
1949 \endcode
1950
1951 If the keyword text contains spaces, the brackets are required.
1952
1953 \note The \\keyword command does not support \qdocvar macro expansion
1954 in its argument.
1955
1956 See also \l {l-command} {\\l (link)}, \l {sa-command} {\\sa (see
1957 also)} and \l {target-command} {\\target}.
1958
1959*/
1960
1961
1962/*!
1963 \page 09-qdoc-commands-includingimages.html
1964 \previouspage Creating Links
1965 \nextpage Tables and Lists
1966
1967 \title Including Images
1968
1969 The graphic commands makes it possible to include images in the
1970 documentation. The images can be rendered as separate paragraphs,
1971 or within running text.
1972
1973 \target image-command
1974 \section1 \\image
1975
1976 The \\image command expands to the image specified by its first
1977 argument, and renders it centered as a separate paragraph.
1978
1979 The command takes two arguments. The first argument is the name of
1980 the image file. The second argument is a description of what
1981 the image contains, and is used for the HTML \c alt attribute.
1982 Its contents is read aloud by screen readers, and its use is therefore
1983 strongly recommended for accessibility purposes. It may also be used by
1984 browsers that don't support images, like the Lynx text browser. You
1985 can also set the \l {usealttextastitle-variable} {usealttextastitle}
1986 variable to make QDoc generate a \e title attribute for the image, which
1987 commonly is rendered by graphical text browsers as a tooltip when the user
1988 hovers the mouse over the image.
1989
1990 While QDoc is quite forgiving, you should wrap both the file name and the
1991 description in curly braces, like so:
1992 \badcode
1993 \image {Bandit.png} {A Golden Retriever holding a bag of coffee in its mouth}
1994 \endcode
1995 This syntax is the most explicit and should always give the expected result.
1996 If not, be sure to follow the file name or the description with a line break.
1997 Curly brackets are required if the description argument spans multiple lines.
1998 If the description is wrapped in double quotes, QDoc will remove them before
1999 generating output. Special characters may be replaced with the corresponding
2000 HTML entity code in QDoc's HTML output.
2001
2002 \badcode *
2003 /\1!
2004 Qt is a C++ toolkit for cross-platform GUI application development.
2005
2006 \image {happyguy.jpg} {Happy guy}
2007
2008 Qt provides single-source portability across Microsoft
2009 Windows, macOS, Linux, and all major commercial Unix
2010 variants. It is also available for embedded devices.
2011 \1/
2012 \endcode
2013
2014 See also \l {inlineimage-command} {\\inlineimage} and \l
2015 {caption-command} {\\caption}.
2016
2017 \target inlineimage-command
2018 \section1 \\inlineimage
2019
2020 The \\inlineimage command expands to the image specified by its
2021 argument. The image is rendered inline with the rest of the text.
2022
2023 The command takes two arguments. The first argument is the name of
2024 the image file. The second argument is optional and is a simple
2025 description of the image within braces {}, equivalent to the HTML
2026 alt="" in an image tag. The description is used for tooltips, and
2027 for when a browser doesn't support images, like the Lynx text browser.
2028
2029 The most common use of the \\inlineimage command is in lists and
2030 tables. Here is an example of including inline images in a list:
2031
2032 \badcode *
2033 /\1!
2034 \list 1
2035 \li \inlineimage happy.gif {Oh so happy, I am a caption!}
2036 \li \inlineimage happy.gif Oh so happy, but I'm not a caption.
2037 \endlist
2038 \1/
2039 \endcode
2040
2041 Here is an example of including inline images in a table:
2042
2043 \badcode *
2044 /\1!
2045 \table
2046 \header
2047 \li Qt
2048 \li Qt Creator
2049 \row
2050 \li \inlineimage happy.gif {Oh so happy!}
2051 \li \inlineimage happy.gif Oh so happy!
2052 \row
2053 \li \inlineimage happy.gif Oh so happy!
2054 \li \inlineimage happy.gif {Oh so happy!}
2055 \endtable
2056 \1/
2057 \endcode
2058
2059 The command can also be used to insert an image inline with the
2060 text.
2061
2062 \badcode *
2063 /\1!
2064 \inlineimage training.jpg {Qt Training} The Qt Programming course is
2065 offered as a five day Open Enrollment Course. The classes are open to
2066 the public. Although the course is open to anyone who wants to learn,
2067 attendees should have significant experience in C++ development to
2068 derive maximum benefit from the course.
2069 \1/
2070 \endcode
2071
2072 See also \l {image-command} {\\image} and \l {caption-command} {\\caption}.
2073
2074 \target caption-command
2075 \section1 \\caption
2076
2077 The \\caption command provides a caption for an image.
2078
2079 The command takes all the text up to the end of the paragraph to
2080 be the caption. Experiment until you get the effect you want.
2081
2082 \badcode *
2083 /\1!
2084 \table 100%
2085 \row
2086 \li \image windows-pushbutton.png
2087 \caption The QPushButton widget provides a command button.
2088 \li \image windows-toolbutton.png
2089 \caption The QToolButton class provides a quick-access button to commands
2090 or options, usually used inside a QToolBar.
2091 \endtable
2092 \1/
2093 \endcode
2094
2095 See also \l {image-command} {\\image} and \l {inlineimage-command}
2096 {\\inlineimage}
2097*/
2098
2099
2100/*!
2101 \page 10-qdoc-commands-tablesandlists.html
2102 \previouspage Including Images
2103 \nextpage Special Content
2104
2105 \title Tables and Lists
2106
2107 These commands enable creating lists and tables. A list is
2108 rendered left aligned as a separate paragraph. A table is rendered
2109 centered as a separate paragraph. The table width depends on the
2110 width of its contents.
2111
2112 \target table-command
2113 \section1 \\table
2114
2115 The \\table and \\endtable commands delimit the contents of a
2116 table.
2117
2118 The command accepts a single argument specifying the table's width
2119 as a percentage of the page width:
2120
2121 \badcode *
2122 /\1!
2123 \table 100%
2124
2125 ...
2126
2127 \endtable
2128 \1/
2129 \endcode
2130
2131 The code above ensures that the table will fill all available
2132 space. If the table's width is smaller than 100 %, the table will
2133 be centered in the generated documentation.
2134
2135 A table can contain headers, rows and columns. A row starts with a
2136 \l {row-command} {\\row} command and consists of cells, each of which
2137 starts with an \l {li-command} {\\li} command. There is also a \l
2138 {header-command} {\\header} command which is a special kind of row
2139 that has a special format.
2140
2141 \badcode *
2142 /\1!
2143 \table
2144 \header
2145 \li Qt Core Feature
2146 \li Brief Description
2147 \row
2148 \li \l {Signal and Slots}
2149 \li Signals and slots are used for communication
2150 between objects.
2151 \row
2152 \li \l {Layout Management}
2153 \li The Qt layout system provides a simple
2154 and powerful way of specifying the layout
2155 of child widgets.
2156 \row
2157 \li \l {Drag and Drop}
2158 \li Drag and drop provides a simple visual
2159 mechanism which users can use to transfer
2160 information between and within applications.
2161 \endtable
2162 \1/
2163 \endcode
2164
2165 You can also make cells span several rows and columns. For
2166 example:
2167
2168 \badcode *
2169 /\1!
2170 \table
2171 \header
2172 \li {3,1} This header cell spans three columns,
2173 but only one row.
2174 \row
2175 \li {2, 1} This table cell spans two columns,
2176 but only one row
2177 \li {1, 2} This table cell spans only one column,
2178 but two rows.
2179 \row
2180 \li A regular table cell
2181 \li A regular table cell
2182 \endtable
2183 \1/
2184 \endcode
2185
2186 See also \l {header-command} {\\header}, \l {row-command} {\\row} and \l {li-command} {\\li}.
2187
2188 \target header-command
2189 \section1 \\header
2190
2191 The \\header command indicates that the following table cells are
2192 the current table's column headers.
2193
2194 The command can only be used within the \l{table-command}
2195 {\\table...\\endtable} commands. A header can contain several
2196 cells. A cell is created with the \l {li-command} {\\li} command.
2197
2198 A header cell's text is centered within the table cell and
2199 rendered using a bold font.
2200
2201 \badcode *
2202 /\1!
2203 \table
2204 \header
2205 \li Qt Core Feature
2206 \li Brief Description
2207 \row
2208 \li \l {Signal and Slots}
2209 \li Signals and slots are used for communication
2210 between objects.
2211 \endtable
2212 \1/
2213 \endcode
2214
2215 See also \l {table-command} {\\table}, \l {row-command} {\\row} and \l {li-command} {\\li}.
2216
2217 \target row-command
2218 \section1 \\row
2219
2220 The \\row command begins a new row in a table. The \l {li-command}
2221 {\\li items} that belong in the new row will immediately follow the
2222 \\row.
2223
2224 The command can only be used within the \l{table-command}
2225 {\\table...\\endtable} commands. A row can contain several
2226 cells. A cell is created with the \l {li-command} {\\li} command.
2227
2228 The background cell color of each row alternates between two
2229 shades of grey, making it easier to distinguish the rows from each
2230 other. The cells' contents is left aligned.
2231
2232 \badcode *
2233 /\1!
2234 \table
2235 \header
2236 \li Qt Core Feature
2237 \li Brief Description
2238 \row
2239 \li \l {Signal and Slots}
2240 \li Signals and slots are used for communication
2241 between objects.
2242 \row
2243 \li \l {Layout Management}
2244 \li The Qt layout system provides a simple
2245 and powerful way of specifying the layout
2246 of child widgets.
2247 \row
2248 \li \l {Drag and Drop}
2249 \li Drag and drop provides a simple visual
2250 mechanism which users can use to transfer
2251 information between and within applications.
2252 \endtable
2253 \1/
2254 \endcode
2255
2256 See also \l {table-command} {\\table}, \l {header-command}
2257 {\\header}, and \l {li-command} {\\li}.
2258
2259 \target value-command
2260 \section1 \\value
2261
2262 The \\value command starts the documentation of a C++ enum item.
2263
2264 The command's first argument is the value name. The value name may
2265 be preceded by an optional \e since clause enclosed in square
2266 brackets. The value description follows the value name. The description
2267 ends at the next blank line or \\value. The arguments are rendered in a
2268 table.
2269
2270 \note To include images in the \\value description, use the
2271 \l {inlineimage-command}{\\inlineimage} command.
2272
2273 Without a \e since clause, a \\value command could look like this:
2274
2275 \code
2276 \value QtInfoMsg A message generated by the qInfo() function.
2277 \endcode
2278
2279 The same command with a \e since clause would look like this:
2280
2281 \code
2282 \value [since 5.5] QtInfoMsg A message generated by the qInfo() function.
2283 \endcode
2284
2285 The documentation will be located in the associated class, header
2286 file or namespace documentation. See the \l {enum-command}
2287 {\\enum} documentation for an example.
2288
2289 \note Since Qt 5.4, \\value command can also be used outside the
2290 \l {enum-command} {\\enum} topic. In this case, QDoc renders a
2291 two-column table listing the constant name (taken as-is from the
2292 first argument) and its description. This can be used, for
2293 example, in \l {qmlproperty-command}{\\qmlproperty} topic for
2294 documenting acceptable values for a QML enumeration property.
2295
2296 See also \l {enum-command} {\\enum} and \l {omitvalue-command} {\\omitvalue}.
2297
2298 \target omitvalue-command
2299 \section1 \\omitvalue
2300
2301 The \\omitvalue command excludes a C++ enum item from the
2302 documentation.
2303
2304 The command's only mandatory argument is the name of the enum item
2305 that will be omitted. If the enum item is followed by a single-line
2306 description, that is also omitted.
2307
2308 See the \l {enum-command} {\\enum} documentation for an example.
2309
2310 See also \l {enum-command} {\\enum} and \l {value-command}
2311 {\\value} \l {since-command}{\\since}
2312
2313 \target list-command
2314 \section1 \\list
2315
2316 The \\list and \\endlist commands delimit a list of items.
2317
2318 Create each list item with the \l {li-command} {\\li} command. A
2319 list always contains one or more items. Lists can be nested. For
2320 example:
2321
2322 \badcode *
2323 /\1!
2324 \list
2325 \li Qt Reference Documentation: Getting Started
2326 \list
2327 \li How to Learn Qt
2328 \li Installation
2329 \list
2330 \li Qt/X11
2331 \li Qt/Windows
2332 \li Qt/Mac
2333 \li Qt/Embedded
2334 \endlist
2335 \li Tutorial and Examples
2336 \endlist
2337 \endlist
2338 \1/
2339 \endcode
2340
2341 The \\list command takes an optional argument providing
2342 alternative appearances for the list items.
2343
2344 \badcode *
2345 /\1!
2346 \list
2347 \li How to Learn Qt
2348 \li Installation
2349 \li Tutorial and Examples
2350 \endlist
2351 \1/
2352 \endcode
2353
2354 If you provide 'A' as an argument to the \\list command, the
2355 bullets are replaced with characters in alphabetical order:
2356
2357 \list A
2358 \li How to Learn Qt
2359 \li Installation
2360 \li Tutorial and Examples
2361 \endlist
2362
2363 If you replace 'A' with '1', the list items are numbered in
2364 ascending order:
2365
2366 \list 1
2367 \li How to Learn Qt
2368 \li Installation
2369 \li Tutorial and Examples
2370 \endlist
2371
2372 If you provide 'i' as the argument, the bullets are replaced with
2373 roman numerals:
2374
2375 \list i
2376 \li How to Learn Qt
2377 \li Installation
2378 \li Tutorial and Examples
2379 \endlist
2380
2381 Finally, you can make the list items appear with roman numbers
2382 following in ascending order if you provide 'I' as the optional
2383 argument:
2384
2385 \list I
2386 \li How to Learn Qt
2387 \li Installation
2388 \li Tutorial and Examples
2389 \endlist
2390
2391 You can also make the listing start at any character or number by
2392 simply provide the number or character you want to start at. For
2393 example:
2394
2395 \badcode *
2396 /\1!
2397 \list G
2398 \li How to Learn Qt
2399 \li Installation
2400 \li Tutorial and Examples
2401 \endlist
2402 \1/
2403 \endcode
2404
2405 See also \l {li-command} {\\li}.
2406
2407 \target li-command
2408 \section1 \\li (table cell, list item)
2409
2410 The \\li command marks a table cell or a list item. This command
2411 is only used in \l{table-command} {tables} and \l{list-command}
2412 {lists}.
2413
2414 It considers everything as its argument until the next \\li command, until the
2415 next \l {table-command} {\\endtable}, or \l {list-command} {\\endlist}
2416 command. See \l {table-command} {\\table} and \l {list-command} {\\list}
2417 for examples.
2418
2419 If the command is used within a table, you can also specify
2420 how many rows or columns the item should span.
2421
2422 \badcode *
2423 /\1!
2424 \table
2425 \header
2426 \li {3,1} This header cell spans three columns
2427 but only one row.
2428 \row
2429 \li {2, 1} This table item spans two columns
2430 but only one row
2431 \li {1, 2} This table item spans only one column,
2432 but two rows.
2433 \row
2434 \li A regular table item
2435 \li A regular table item
2436 \endtable
2437 \1/
2438 \endcode
2439
2440 If not specified, the item will span one column and one row.
2441
2442 See also \l {table-command} {\\table}, \l {header-command}
2443 {\\header}, and \l {list-command} {\\list}.
2444
2445*/
2446
2447
2448/*!
2449 \page 11-qdoc-commands-specialcontent.html
2450 \previouspage Tables and Lists
2451 \nextpage Miscellaneous
2452
2453 \title Special Content
2454
2455 The document contents commands identify parts of the documentation,
2456 parts with a special rendering, conceptual meaning or
2457 function.
2458
2459 \target quotation-command
2460 \section1 \\quotation
2461
2462 The \\quotation and \\endquotation commands delimit a long quotation.
2463
2464 The text in the delimited block is surrounded by
2465 \b{<blockquote>} and \b{</blockquote>} in the html output,
2466 e.g.:
2467
2468 \badcode *
2469 /\1!
2470 Although the prospect of a significantly broader market is
2471 good news for Firstlogic, the notion also posed some
2472 challenges. Dave Dobson, director of technology for the La
2473 Crosse, Wisconsin-based company, said:
2474
2475 \quotation
2476 As our solutions were being adopted into new
2477 environments, we saw an escalating need for easier
2478 integration with a wider range of enterprise
2479 applications.
2480 \endquotation
2481 \1/
2482 \endcode
2483
2484 The text in the \b{\\quotation} block will appear in the generated HTML as:
2485
2486 \badcode
2487 <blockquote>
2488 <p>As our solutions were being adopted into new environments,
2489 we saw an escalating need for easier integration with a wider
2490 range of enterprise applications.</p>
2491 </blockquote>
2492 \endcode
2493
2494 The built-in style sheet for most browsers will render the
2495 contents of the <blockquote> tag with left and right
2496 indentations. The example above would be rendered as:
2497
2498 \quotation
2499 As our solutions were being adopted into new
2500 environments, we saw an escalating need for easier
2501 integration with a wider range of enterprise
2502 applications.
2503 \endquotation
2504
2505 But you can redefine the \b{<blockquote>} tag in your style.css file.
2506
2507
2508 \target note-command
2509 \section1 \\note
2510
2511 The \\note command defines a new paragraph preceded by "Note:"
2512 in bold. The command takes a continuous paragraph as the argument,
2513 terminating after the end of the paragraph. The note command is only for
2514 shorter statements and not for longer multiline paragraphs.
2515
2516 Similar to the \l{warning-command}{\\warning} command, the note is for
2517 short and important statements. See
2518 \l{https://wiki.qt.io/Qt_Writing_Guidelines}{Qt Writing Guidelines} for
2519 usage information.
2520
2521 \target notranslate-command
2522 \section1 \\notranslate
2523
2524 The \\notranslate command indicates that its argument is \b not to be translated,
2525 when the generated output is passed to a language translation service.
2526
2527 Other commands (\qdoccmd {c}, \qdoccmd {tt}) have the same effect, but
2528 \\notranslate does not style its argument in any way.
2529
2530 This command was introduced in QDoc version 6.10.
2531
2532 \target brief-command
2533 \section1 \\brief
2534
2535 The \\brief command introduces a one-sentence description of
2536 any of the \l{Topic Commands}.
2537
2538 The brief text is used to introduce the documentation of the
2539 associated object, and in lists generated using the \l
2540 {generatelist-command} {\\generatelist} command and the \l
2541 {annotatedlist-command} {\\annotatedlist} command.
2542
2543 The brief text will be displayed in the documentation
2544 for that particular topic.
2545
2546 For example the boolean QWidget::isWindow property:
2547
2548 \badcode *
2549 /\1!
2550 \property QWidget::isActiveWindow
2551 \brief Whether this widget's window is the active window.
2552
2553 The active window is the window that contains the widget that
2554 has keyboard focus.
2555
2556 When popup windows are visible, this property is \c true
2557 for both the active window \e and the popup.
2558
2559 \sa activateWindow(), QApplication::activeWindow()
2560 \1/
2561 \endcode
2562
2563 and the QWidget::geometry property
2564
2565 \badcode *
2566 /\1!
2567 \property QWidget::geometry
2568 \brief The geometry of the widget relative to its parent and
2569 excluding the window frame.
2570
2571 When changing the geometry, the widget, if visible,
2572 receives a move event (moveEvent()) and/or a resize
2573 event (resizeEvent()) immediately.
2574
2575 ...
2576
2577 \sa frameGeometry(), rect(), ...
2578 \1/
2579 \endcode
2580
2581 When the \\brief command is used to describe a class, we recommend
2582 using a complete sentence like this:
2583
2584 \badcode
2585 The <classname> class is|provides|contains|specifies...
2586 \endcode
2587
2588 \warning Do not repeat your detailed description with the same sentence as
2589 the brief statement will be the first paragraph of the detailed
2590 description.
2591
2592 \badcode *
2593 /\1!
2594 \class PreviewWindow
2595 \brief The PreviewWindow class is a custom widget
2596 displaying the names of its currently set
2597 window flags in a read-only text editor.
2598
2599 The PreviewWindow class inherits QWidget. The widget
2600 displays the names of its window flags set with the
2601 setWindowFlags() function. It is also provided with a
2602 QPushButton that closes the window.
2603
2604 ...
2605
2606 \sa QWidget
2607 \1/
2608 \endcode
2609
2610 Using \\brief in a \l{namespace-command}{\\namespace}:
2611
2612 \badcode *
2613 /\1!
2614 \namespace Qt
2615
2616 \brief The Qt namespace contains miscellaneous identifiers
2617 used throughout the Qt library.
2618 \1/
2619 \endcode
2620
2621 Using \\brief in a \l{headerfile-command}{\\headerfile}:
2622
2623 \badcode *
2624 /\1!
2625 \headerfile <QtGlobal>
2626 \title Global Qt Declarations
2627
2628 \brief The <QtGlobal> header file provides basic
2629 declarations and is included by all other Qt headers.
2630
2631 \sa <QtAlgorithms>
2632 \1/
2633 \endcode
2634
2635 See also \l{property-command} {\\property}, \l{class-command}
2636 {\\class}, \l{namespace-command} {\\namespace} and
2637 \l{headerfile-command} {\\headerfile}.
2638
2639 \target legalese-command
2640 \section1 \\legalese
2641
2642 The \\legalese and \\endlegalese commands delimit a license agreement.
2643
2644 In the generated HTML, the delimited text is surrounded by a \b
2645 {<div class="LegaleseLeft">} and \b {</div>} tags.
2646
2647 An example of a license agreement enclosed in \\legalese
2648 and \\endlegalese:
2649
2650 \badcode *
2651 /\1!
2652 \legalese
2653 Copyright 1996 Daniel Dardailler.
2654
2655 Permission to use, copy, modify, distribute, and sell this
2656 software for any purpose is hereby granted without fee,
2657 provided that the above copyright notice appear in all
2658 copies and that both that copyright notice and this
2659 permission notice appear in supporting documentation, and
2660 that the name of Daniel Dardailler not be used in
2661 advertising or publicity pertaining to distribution of the
2662 software without specific, written prior permission. Daniel
2663 Dardailler makes no representations about the suitability of
2664 this software for any purpose. It is provided "as is"
2665 without express or implied warranty.
2666
2667 Modifications Copyright 1999 Matt Koss, under the same
2668 license as above.
2669 \endlegalese
2670 \1/
2671 \endcode
2672
2673 It will appear in the generated HTML as:
2674
2675 \badcode
2676 <div class="LegaleseLeft">
2677 <p>Copyright 1996 Daniel Dardailler.</p>
2678 <p>Permission to use, copy, modify, distribute, and sell
2679 this software for any purpose is hereby granted without fee,
2680 provided that the above copyright notice appear in all
2681 copies and that both that copyright notice and this
2682 permission notice appear in supporting documentation, and
2683 that the name of Daniel Dardailler not be used in
2684 advertising or publicity pertaining to distribution of the
2685 software without specific, written prior permission. Daniel
2686 Dardailler makes no representations about the suitability of
2687 this software for any purpose. It is provided "as is"
2688 without express or implied warranty.</p>
2689
2690 <p>Modifications Copyright 1999 Matt Koss, under the same
2691 license as above.</p>
2692 </div>
2693 \endcode
2694
2695 If the \\endlegalese command is omitted, QDoc will process the
2696 \\legalese command but considers the rest of the documentation
2697 page as the license agreement.
2698
2699 Ideally, the license text is located with the licensed code.
2700
2701 Elsewhere, the documentation identified as \e{\\legalese} command
2702 can be accumulated using \l {generatelist-command} {\\generatelist}
2703 with \c {legalese} as the argument. This is useful for generating
2704 an overview of the license agreements associated with the source
2705 code.
2706
2707 \note The output of the \c {\generatelist legalese} command includes
2708 the \\legalese texts in the current documentation project only. If
2709 the current documentation project depends on other modules, their
2710 license texts will not be listed.
2711
2712 \target warning-command
2713 \section1 \\warning
2714
2715 The \\warning command prepends "Warning:" to the command's
2716 argument, in bold font.
2717
2718 \badcode *
2719 /\1!
2720 Qt::HANDLE is a platform-specific handle type
2721 for system objects. This is equivalent to
2722 \c{void *} on Windows and macOS, and to
2723 \c{unsigned long} on X11.
2724
2725 \warning Using this type is not portable.
2726 \1/
2727 \endcode
2728*/
2729
2730
2731/*!
2732 \page 12-0-qdoc-commands-miscellaneous.html
2733 \previouspage Special Content
2734 \nextpage The QDoc Configuration File
2735
2736 \title Miscellaneous
2737
2738 These commands provide miscellaneous functions connected to the
2739 visual appearance of the documentation, and to the process of
2740 generating the documentation.
2741
2742 \target annotatedlist-command
2743 \section1 \\annotatedlist
2744
2745 The \\annotatedlist command expands to a list of the members of a
2746 group, each member listed with its \e {brief} text. Below is an
2747 example from the Qt Reference Documentation:
2748
2749 \badcode *
2750 /\1!
2751 ...
2752 \section1 Drag and Drop Classes
2753
2754 These classes deal with drag and drop and the necessary mime type
2755 encoding and decoding.
2756
2757 \annotatedlist draganddrop
2758 \1/
2759 \endcode
2760
2761 This generates a list of all the C++ classes and/or QML types in
2762 the \e{draganddrop} group. A C++ class or QML type in the
2763 \e{draganddrop} group will have \e{\\ingroup draganddrop} in its
2764 \e{\\class} or \e{\\qmltype} comment.
2765
2766 The group members are sorted in ascending order, based on
2767 user-visible name or title. Since QDoc 6.8, \\annotatedlist
2768 and \qdoccmd generatelist support also custom sorting.
2769
2770 See also \qdoccmd generatelist and \l {Sorting group members}.
2771
2772 \target cmakepackage-command
2773 \section1 \\cmakepackage
2774
2775 Use the \\cmakepackage command to add CMake package information to classes
2776 and namespaces. This information will then appear in a table at the top of
2777 the class or namespace documentation page. For example:
2778
2779 \badcode *
2780 /*!
2781 \namespace Foo
2782 \inheaderfile Bar
2783 \cmakepackage Baz
2784 \brief A namespace.
2785
2786 ...
2787 \1/
2788 \endcode
2789
2790 QDoc will output this as
2791
2792 \quotation
2793 \raw HTML
2794 <h1 class="title">Foo Namespace</h1>
2795 <p>A namespace. <a>More...</a></p>
2796 <div class="table"><table class="alignedsummary">
2797 <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include &lt;Bar&gt;</span></td></tr>
2798 <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>
2799 </table></div>
2800 \endraw
2801 \endquotation
2802
2803 \e{See also} \l{module-command}{\\module} and
2804 \l{cmakecomponent}{\\cmakecomponent}}
2805
2806 \target cmakecomponent-command
2807 \section1 \\cmakecomponent
2808
2809 Use the \\cmakecomponent command to add CMake component information to classes
2810 and namespaces. This information will then appear in a table at the top of
2811 the class or namespace documentation page. For example:
2812
2813 \badcode *
2814 /*!
2815 \namespace Foo
2816 \inheaderfile Bar
2817 \cmakecomponent Baz
2818 \brief A namespace.
2819
2820 ...
2821 \1/
2822 \endcode
2823
2824 QDoc will output this as
2825
2826 \quotation
2827 \raw HTML
2828 <h1 class="title">Foo Namespace</h1>
2829 <p>A namespace. <a>More...</a></p>
2830 <div class="table"><table class="alignedsummary">
2831 <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include &lt;Bar&gt;</span></td></tr>
2832 <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>
2833 </table></div>
2834 \endraw
2835 \endquotation
2836
2837 \e{See also} \l{module-command}{\\module} and
2838 \l{cmakepackage}{\\cmakepackage}}
2839
2840 \target cmaketargetitem-command
2841 \section1 \\cmaketargetitem
2842
2843 Use the \\cmaketargetitem command to override the \e {item} part of the
2844 CMake \c{target_link_libraries} information that's added to classes and
2845 namespaces. The command must be used in conjunction with the
2846 \l{module-command}{\\module} and \l{cmakecomponent}{\\cmakecomponent}
2847 commands. For example:
2848
2849 \badcode *
2850 /*!
2851 \namespace Foo
2852 \inheaderfile Bar
2853 \cmakecomponent Baz
2854 \cmaketargetitem Qt6::BazPrivate
2855 \brief A namespace.
2856
2857 ...
2858 \1/
2859 \endcode
2860
2861 QDoc will output this as
2862
2863 \quotation
2864 \raw HTML
2865 <h1 class="title">Foo Namespace</h1>
2866 <p>A namespace. <a>More...</a></p>
2867 <div class="table"><table class="alignedsummary">
2868 <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include &lt;Bar&gt;</span></td></tr>
2869 <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>
2870 </table></div>
2871 \endraw
2872 \endquotation
2873
2874 \e{See also} \l{module-command}{\\module} and
2875 \l{cmakecomponent}{\\cmakecomponent}}
2876
2877
2878 \target qtcmakepackage-command
2879 \section1 \\qtcmakepackage
2880
2881 Use the \\qtcmakepackage command to add CMake package information to classes
2882 and namespaces. This information will then appear in a table at the top of
2883 the class or namespace documentation page. For example:
2884
2885 \badcode *
2886 /*!
2887 \namespace Foo
2888 \inheaderfile Bar
2889 \qtcmakepackage Baz
2890 \brief A namespace.
2891
2892 ...
2893 \1/
2894 \endcode
2895
2896 QDoc will output this as
2897
2898 \quotation
2899 \raw HTML
2900 <h1 class="title">Foo Namespace</h1>
2901 <p>A namespace. <a>More...</a></p>
2902 <div class="table"><table class="alignedsummary">
2903 <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include &lt;Bar&gt;</span></td></tr>
2904 <tr><td class="memItemLeft rightAlign topAlign"> CMake:</td><td class="memItemRight bottomAlign"> find_package(Qt6 REQUIRED COMPONENTS Baz)</td></tr>
2905 </table></div>
2906 \endraw
2907 \endquotation
2908
2909
2910 \target qtcmaketargetitem-command
2911 \section1 \\qtcmaketargetitem
2912
2913 Use the \\qtcmaketargetitem command to override the \e {item} part of the
2914 CMake \c{target_link_libraries} information that's added to classes and
2915 namespaces. The command must be used in conjunction with the
2916 \l{module-command}{\\module} and \l{qtcmakepackage}{\\qtcmakepackage}
2917 commands.
2918
2919 \e{See also} \l{module-command}{\\module} and
2920 \l{qtcmakepackage}{\\qtcmakepackage}}
2921
2922
2923 \target generatelist-command
2924 \section1 \\generatelist
2925
2926 The \\generatelist command expands to a list of links to the
2927 documentation entities grouped with an \l {ingroup-command}
2928 {\\ingroup} command or entities that match one of the arguments
2929 listed below. An example from the Qt Reference Documentation:
2930
2931 \badcode *
2932 /\1!
2933 \page classes.html
2934 \title All Classes
2935
2936 For a shorter list that only includes the most
2937 frequently used classes, see \l{Qt's Main Classes}.
2938
2939 \generatelist classes Q
2940 \1/
2941 \endcode
2942
2943 This generates the \e {All Classes} page. The command accepts the
2944 following arguments:
2945
2946 \section2 \c {<group-name>}
2947
2948 With a group name as the only argument, QDoc lists all entities that
2949 use the \c {\ingroup <group-name>} command.
2950
2951 \section3 Sorting group members
2952
2953 When generating a list of group members, they are sorted in ascending
2954 order, based on user-visible name or title. Since QDoc 6.8, the default
2955 sort order can be modified:
2956
2957 \badcode
2958 \generatelist [descending] changelogs
2959 \endcode
2960
2961 Assuming the \e changelogs group consists of pages
2962 detailing changes in different versions, this generates the
2963 list in descending order (newest version first).
2964
2965 \section4 Sort key
2966
2967 Since QDoc 6.8, a custom sort key can be assigned to one or
2968 more group members using the \qdoccmd meta command:
2969
2970 \badcode
2971 \meta sortkey {sort key}
2972 \endcode
2973
2974 Sorting (ascending or descending) is then done based on
2975 these key(s), rather than user-visible titles.
2976
2977 \note Any group member with a sort key is listed \e before
2978 members without a key (in the default ascending order). This
2979 allows raising individual group member(s) to the top of the
2980 list.
2981
2982 \target table example
2983 \section2 \c annotatedclasses
2984
2985 The \c annotatedclasses argument provides a table containing the
2986 names of all the classes, and a description of each class. Each
2987 class name is a link to the class's reference documentation. For
2988 example:
2989
2990 \table
2991 \row
2992 \li QDial
2993 \li Rounded range control (like a speedometer or potentiometer)
2994 \row
2995 \li QDialog
2996 \li The base class of dialog windows
2997 \row
2998 \li QDir
2999 \li Access to directory structures and their contents
3000 \endtable
3001
3002 A C++ class is documented with the \l {class-command} {\\class}
3003 command. The annotation for the class is taken from the argument
3004 of the class comment's \l {brief-command} {\\brief} command.
3005
3006 \section2 \c annotatedexamples
3007
3008 The \c annotatedexamples argument provides a complete list of all
3009 examples as a set of tables containing the titles of all the
3010 examples, and a description of each example. Each title is a
3011 link to the example's documentation.
3012
3013 A separate table for each module (that has documented examples)
3014 is generated, provided that the module has defined a
3015 navigation.landingpage configuration variable. The \e landingpage
3016 variable is used as a title for a header that precedes each table.
3017
3018 \section2 \c annotatedattributions
3019
3020 The \c annotatedattributions argument provides a complete list of all
3021 attributions as a set of tables containing the titles of all the
3022 attributions, and a description of each attribution. Each title is a
3023 link to the attribution's page.
3024
3025 A separate table for each module (that has attributions)
3026 is generated, provided that the module has defined a
3027 navigation.landingpage configuration variable. The \e landingpage
3028 variable is used as a title for a header that precedes each table.
3029
3030 \target list example
3031 \section2 \c {classes <prefix>}
3032
3033 The \c classes argument provides a complete alphabetical list of
3034 the classes. The second argument, \c{<prefix>}, is the common
3035 prefix for the class names. The class names will be sorted on the
3036 character that follows the common prefix. e.g. The common prefix
3037 for the Qt classes is \c Q. The common prefix argument is
3038 optional. If no common prefix is provided, the class names will
3039 be sorted on their first character.
3040
3041 Each class name becomes a link to the class's reference
3042 documentation. This command is used to generate the
3043 \e {All Classes} page this way:
3044
3045 \badcode *
3046 /\1!
3047 \page classes.html
3048 \title All Classes
3049 \ingroup classlists
3050
3051 \brief Alphabetical list of classes.
3052
3053 This is a list of all Qt classes. For classes that
3054 have been deprecated, see the \l{Obsolete Classes}
3055 list.
3056
3057 \generatelist classes Q
3058 \1/
3059 \endcode
3060
3061 A C++ class is documented with the \l {class-command} {\\class}
3062 command.
3063
3064 \section2 \c classesbymodule
3065
3066 When this argument is used, a second argument is required, which
3067 specifies the module whose classes are to be listed. QDoc
3068 generates a table containing those classes. Each class is listed
3069 with the text of its \l{brief-command} {\\brief} command.
3070
3071 For example, this command can be used on a module page as follows:
3072
3073 \badcode *
3074 /\1!
3075 \page phonon-module.html
3076 \module Phonon
3077 \title Phonon Module
3078 \ingroup modules
3079
3080 \brief Contains namespaces and classes for multimedia functionality.
3081
3082 \generatelist{classesbymodule Phonon}
3083
3084 ...
3085 \1/
3086 \endcode
3087
3088 Each class that is a member of the specified module must be marked
3089 with the \l {inmodule-command} {\\inmodule} command in its \\class
3090 comment.
3091
3092 \section2 \c qmltypesbymodule
3093
3094 Similar to \c classesbymodule argument, but used for listing the
3095 QML types (excluding QML value types) from the QML module specified
3096 with the second argument.
3097
3098 \note Support for this argument was introduced in QDoc 5.6.
3099
3100 \section2 \c qmlvaluetypesbymodule
3101
3102 Similar to \c qmltypesbymodule argument, but lists QML value
3103 types instead.
3104
3105 \note Support for this argument was introduced in QDoc 6.7.
3106
3107 \section2 \c functionindex
3108
3109 The \c functionindex argument provides a complete alphabetical
3110 list of all the documented member functions. It is normally used
3111 only to generate the \e {Qt function index} page
3112 this way:
3113
3114 \badcode *
3115 /\1!
3116 \page functions.html
3117 \title All Functions
3118 \ingroup funclists
3119
3120 \brief All documented Qt functions listed alphabetically with a
3121 link to where each one is declared.
3122
3123 This is the list of all documented member functions and global
3124 functions in the Qt API. Each function has a link to the
3125 class or header file where it is declared and documented.
3126
3127 \generatelist functionindex
3128 \1/
3129 \endcode
3130
3131 \section2 \c legalese
3132
3133 The \c legalese argument tells QDoc to generate a list of licenses in
3134 the current documentation project. Each license is identified using
3135 the \l {legalese-command} {\\legalese} command.
3136
3137 \section2 \c overviews
3138
3139 The \c overviews argument is used to tell QDoc to generate a list
3140 by concatenating the contents of all the \l {group-command}
3141 {\\group} pages. Qt uses it to generate the \e {overviews} page
3142 this way:
3143
3144 \badcode *
3145 /\1!
3146 \page overviews.html
3147
3148 \title All Overviews and HOWTOs
3149
3150 \generatelist overviews
3151 \1/
3152 \endcode
3153
3154 \section2 \c attributions
3155
3156 The \c attributions argument is used to tell QDoc to generate a list
3157 of attributions in the documentation.
3158
3159 \section2 \c related
3160
3161 The \c related argument is used in combination with the \l
3162 {group-command} {\\group} and \l {ingroup-command} {\\ingroup}
3163 commands to list all the overviews related to a specified
3164 group. For example, the page for the \e {Programming with Qt}
3165 page is generated this way:
3166
3167 \badcode *
3168 /\1!
3169 \group qt-basic-concepts
3170 \title Programming with Qt
3171
3172 \brief The basic architecture of the Qt cross-platform application and UI framework.
3173
3174 Qt is a cross-platform application and UI framework for
3175 writing web-enabled applications for desktop, mobile, and
3176 embedded operating systems. This page contains links to
3177 articles and overviews explaining key components and
3178 techniuqes used in Qt development.
3179
3180 \generatelist {related}
3181 \1/
3182 \endcode
3183
3184 Each page listed on this group page contains the command:
3185
3186 \code
3187 \ingroup qt-basic-concepts
3188 \endcode
3189
3190 See also \qdoccmd {annotatedlist}.
3191
3192 \target if-command
3193 \section1 \\if
3194
3195 The \\if command and the corresponding \\endif command
3196 enclose parts of a QDoc comment that only will be included if
3197 the condition specified by the command's argument is true.
3198
3199 The command reads the rest of the line and parses it as an C++ #if
3200 statement.
3201
3202 \badcode *
3203 /\1!
3204 \if defined(opensourceedition)
3205
3206 \note This edition is for the development of
3207 \l{Qt Open Source Edition} {Free and Open Source}
3208 software only; see \l{Qt Commercial Editions}.
3209
3210 \endif
3211 \1/
3212 \endcode
3213
3214 This QDoc comment will only be rendered if the \c
3215 opensourceedition preprocessor symbol is defined, and specified in
3216 the \l {defines-variable} {defines} variable in the configuration
3217 file to make QDoc process the code within #ifdef and #endif:
3218
3219 \badcode
3220 defines = opensourceedition
3221 \endcode
3222
3223 You can also define the preprocessor symbol manually on the
3224 command line. For more information see the documentation of the \l
3225 {defines-variable} {defines} variable.
3226
3227 See also \l{endif-command} {\\endif}, \l{else-command} {\\else},
3228 \l {defines-variable} {defines} and \l {falsehoods-variable}
3229 {falsehoods}.
3230
3231 \target endif-command
3232 \section1 \\endif
3233
3234 The \\endif command and the corresponding \\if command
3235 enclose parts of a QDoc comment that will be included if
3236 the condition specified by the \l {if-command} {\\if} command's
3237 argument is true.
3238
3239 For more information, see the documentation of the \l {if-command}
3240 {\\if} command.
3241
3242 See also \l{if-command} {\\if}, \l{else-command} {\\else}, \l
3243 {defines-variable} {defines} and \l {falsehoods-variable}
3244 {falsehoods}.
3245
3246 \target else-command
3247 \section1 \\else
3248
3249 The \\else command specifies an alternative if the
3250 condition in the \l {if-command} {\\if} command is false.
3251
3252 The \\else command can only be used within \l {if-command}
3253 {\\if...\\endif} commands, but is useful when there is only two
3254 alternatives.
3255
3256 \target include-command
3257 \section1 \\include
3258
3259 The \\include command sends all or part of the file specified by
3260 its first argument to the QDoc input stream to be processed as a
3261 QDoc comment snippet.
3262
3263 The command is useful when some snippet of commands or text is to
3264 be used in multiple places in the documentation. Use the \\include
3265 command wherever you want to insert a snippet into the documentation.
3266 The file containing the snippet to include, must be located under the
3267 path(s) listed in the \l{sourcedirs-variable}{sourcedirs} or
3268 \l{exampledirs-variable}{exampledirs} QDoc configuration variable.
3269 It can be either any source file parsed by QDoc (or even the same one
3270 where \\include command is used), or any other text file. To store
3271 snippets in a separate file that is not meant to be parsed by QDoc,
3272 use a file extension that is not listed in
3273 \l{sources.fileextensions-variable}{sources.fileextensions};
3274 for example, \c .qdocinc.
3275
3276 The command can have one or more arguments. The first
3277 argument is always a file name. The contents of the file must be
3278 QDoc input, in other words, a sequence of QDoc commands and text, but
3279 without the enclosing QDoc comment \c{/}\c{*!} ... \c{*}\c{/} delimiters.
3280 If you want to include the entire named file, leave the second argument
3281 empty. If you want to include only part of the file, see the
3282 \l{2-argument-form}{two argument form} below. Here is an example
3283 of the one argument form:
3284
3285 \badcode *
3286 /\1!
3287 \page corefeatures.html
3288 \title Core Features
3289
3290 \include examples/signalandslots.qdocinc
3291 \include examples/objectmodel.qdocinc
3292 \include examples/layoutmanagement.qdocinc
3293 \1/
3294 \endcode
3295
3296
3297 \target 2-argument-form
3298 \section2 \\include filename snippet-identifier
3299
3300 It is a waste of time to make a separate \c .qdocinc file for every
3301 QDoc include snippet you want to use in multiple places in the
3302 documentation, especially given that you probably have to put the
3303 copyright/license notice in every one of these files. If you
3304 have multiple snippets to be included, you can put them all in a
3305 single file and surround each one with:
3306
3307 \badcode
3308 //! [snippet-id1]
3309
3310 QDoc commands and text...
3311
3312 //! [snippet-id1]
3313
3314 //! [snippet-id2]
3315
3316 More QDoc commands and text...
3317
3318 //! [snippet-id2]
3319 \endcode
3320
3321 Then you can use the two-argument form of the command:
3322
3323 \badcode
3324 \include examples/signalandslots.qdocinc snippet-id2
3325 \include examples/objectmodel.qdocinc another-snippet-id
3326 \endcode
3327
3328 The sequence of QDoc commands and text found between the two tags
3329 with the same name as the second argument is sent to the QDoc input
3330 stream. You can even have nested snippets.
3331
3332 \note Snippet identifiers work also within documentation comment
3333 (\beginqdoc .. \endqdoc) blocks, so it's not necessary to use a
3334 separate \c .qdocinc file. When processing a comment block, QDoc
3335 removes any \c {//!} comment lines from the generated output.
3336
3337 \section2 Extra arguments
3338
3339 Since QDoc 6.3, any further arguments passed to the \\include command
3340 are used for injecting strings into the included content. To inject a
3341 string to a specific location in the content, add a backslash followed
3342 by a digit (1..9). The digits correspond with the order of the argument
3343 list. Enclose arguments in curly braces to ensure that QDoc renders the
3344 entire argument, including possible whitespace characters, as you expect.
3345
3346 \important Each additional argument (including the snippet ID) must be
3347 enclosed in braces. If you want to include the entire file,
3348 use an empty snippet ID: \c {{}}.
3349
3350 For example, given the following snippet in a file \c includes.qdocinc:
3351
3352 \badcode
3353 //! [usage]
3354 To enable \e{\1}, select \uicontrol {\2} > \uicontrol Enable.
3355 //! [usage]
3356 \endcode
3357
3358 Then, the following \\include line:
3359
3360 \badcode
3361 \include includes.qdocinc {usage} {detailed output} {Verbose}
3362 \endcode
3363
3364 Renders
3365 \quotation
3366 To enable \e {detailed output}, select \uicontrol {Verbose} >
3367 \uicontrol Enable.
3368 \endquotation
3369
3370 \target meta-command
3371 \section1 \\meta
3372
3373 The \\meta command is used for adding metadata to documentation.
3374 The command has two arguments: the first argument is the name of the
3375 metadata attribute, and the second argument is the value for the attribute.
3376 Each argument should be enclosed in curly brackets, as shown in this
3377 example:
3378
3379 \badcode *
3380 /\1!
3381 \example demos/coffee
3382 \title Coffee Machine
3383 \brief A Qt Quick application with a state-based custom user interface.
3384
3385 \meta {tags} {quick,embedded,states,touch}
3386 \meta {category} {Application Examples}
3387 \1/
3388 \endcode
3389
3390 A number of metadata attributes have a specific purpose:
3391
3392 \b {Example Metadata}
3393
3394 Another use for \\meta command is to include metadata (tags) in
3395 \l {example-command}{\\example} documentation. By default, QDoc
3396 generates example tags based on the example's \l {title-command}{\\title}
3397 and module name. These tags are displayed in Qt Creator's Welcome mode,
3398 helping users navigate the list of examples.
3399
3400 Additional tags can be created with \c {\meta {tag} {tag1}}
3401 or \c {\meta {tags} {tag1,[tag2,...]}}.
3402 For example:
3403
3404 \badcode *
3405 /\1!
3406 \example helloworld
3407 \title Hello World Example
3408 \meta {tags} {tutorial,basic}
3409 \1/
3410 \endcode
3411
3412 This would result in the following tags: \e {tutorial,basic,hello,world}.
3413 Common words such as \e example are ignored.
3414
3415 \b {Excluding Examples}
3416
3417 Marking an example \e broken will exclude it from the generated manifest
3418 file, effectively removing it from Qt Creator's Welcome mode.
3419
3420 \badcode
3421 \meta {tag} {broken}
3422 \endcode
3423
3424 \b {Example Install Paths}
3425
3426 The \\meta command combined with an argument \c installpath specifies the
3427 location of an installed example. This value overrides the one that is set
3428 using the \c examplesinstallpath configuration variable.
3429
3430 \badcode *
3431 /\1!
3432 \example helloworld
3433 \title Hello World Example
3434 \meta {installpath} {tutorials}
3435 \1/
3436 \endcode
3437
3438 See also \l {examplesinstallpath}.
3439
3440 \b {Status}
3441
3442 A \c status argument for the \\meta command adds a custom status description
3443 for a \l {class-command}{\\class} or a \l {qmltype-command}{\\qmltype}. This
3444 description will then appear in a table at the top of the type reference page.
3445
3446 \badcode *
3447 /\1!
3448 \class QNativeInterface::QAndroidApplication
3449 \meta {status} {Android-specific}
3450 \1/
3451 \endcode
3452
3453 See also \l {Status}{status-related commands}.
3454
3455 \b {Document metadata}
3456
3457 A \c keywords argument for the \\meta command adds specified keywords
3458 as metadata for the generated document:
3459
3460 \code [text]
3461 \meta {keywords} {reference, internal}
3462 \endcode
3463
3464 In HTML output, these keywords are generated as a
3465 \c {<meta name="keywords" content="...">} element.
3466
3467 \target noautolist-command
3468 \section1 \\noautolist
3469
3470 The \\noautolist command indicates that the annotated list of C++
3471 classes or QML types, which is automatically generated at the
3472 bottom of the C++ or QML module page should be omitted, because
3473 the classes or types have been listed manually. This command can
3474 also be used with the \l {group-command}{\\group} command to omit
3475 the list of group members, when they are listed manually.
3476
3477 The command must stand on its own line. See \l {Qt Quick Controls QML Types}
3478 for an example. The page is generated from \c {qtquickcontrols2-qmlmodule.qdoc}.
3479 There you will find a QDoc comment containing the \c{\qmlmodule} command for
3480 the QtQuick.Controls module. The same comment contains a \c {\noautolist}
3481 command to disable automatic list generation, and a \l {generatelist-command}
3482 {\\generatelist} to list the QML types in a specific section of the document.
3483
3484 This command was introduced in QDoc 5.6.
3485
3486 Since Qt 5.10, this command can be applied also to \l{example-command}
3487 {\\example} documentation, where it causes the automatically generated
3488 list of files and images belonging to an example project to be omitted.
3489
3490 \target omit-command
3491 \section1 \\omit
3492
3493 The \\omit command and the corresponding \\endomit command
3494 delimit parts of the documentation that you want QDoc to skip. For
3495 example:
3496
3497 \badcode *
3498 /\1!
3499 \table
3500 \row
3501 \li Basic Widgets
3502 \li Basic GUI widgets such as buttons, comboboxes
3503 and scrollbars.
3504
3505 \omit
3506 \row
3507 \li Component Model
3508 \li Interfaces and helper classes for the Qt
3509 Component Model.
3510 \endomit
3511
3512 \row
3513 \li Database Classes
3514 \li Database related classes, e.g. for SQL databases.
3515 \endtable
3516 \1/
3517 \endcode
3518
3519 \target raw-command
3520 \section1 \\raw (avoid!)
3521
3522 The \\raw command and the corresponding
3523 \\endraw command delimit a block of raw mark-up language code.
3524
3525 \warning Avoid using this command if possible. If you are trying to
3526 generate special table or list behavior, try to get the behavior you want
3527 using the \l {span-command} {\\span} and \l {div-command} {\\div}
3528 commands in your \l {table-command} {\\table} or \l {list-command}
3529 {\\list}.
3530
3531 The command takes an argument specifying the code's format.
3532
3533 QDoc generates the given code only when generating the format that
3534 was specified by the user.
3535
3536 For example, "\\raw HTML" will only generate code when QDoc
3537 generates HTML documentation.
3538
3539 \note You can often achieve the intended purpose by using QDoc commands,
3540 while reducing the chance of mistakes or content becoming unmaintained.
3541
3542 \target sincelist-command
3543 \section1 \\sincelist
3544
3545 The \\sincelist command expands to a detailed breakdown of new
3546 inclusions to the documented API in a specified version. Example
3547 usage:
3548
3549 \badcode * \QtMajorVersion \QtMinorVersion \QtVer
3550 /\1!
3551 \page newclasses\2\3.html
3552 \title New Classes and Functions in \4
3553 \brief A comprehensive list of new classes and functions in \4.
3554
3555 \sincelist \4
3556 \1/
3557 \endcode
3558
3559 \\sincelist takes a single argument, a version string. The generated
3560 output includes all functionality that is marked with a
3561 \l {since-command}{\\since} command or a \l {since clause} matching
3562 the version string.
3563
3564 \target unicode-command
3565 \section1 \\unicode
3566
3567 The \\unicode command allows you to insert an arbitrary Unicode
3568 character in the document.
3569
3570 The command takes an argument specifying the character as an
3571 integer. By default, base 10 is assumed, unless a '0x' or '0'
3572 prefix is specified (for base 16 and 8, respectively).
3573*/