QDoc Linking Guidelines: Difference between revisions

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h1. QDoc Linking Guidelines
[[Category:Writing Guidelines]]
 
This page is part of the [[QtWritingGuidelines | Qt Writing Guidelines]]
This page is part of the [[QtWritingGuidelines | Qt Writing Guidelines]]


This page contains information about creating links to API pages and other articles and content.<br />'''Note:''' This applies to '''Qt 5''' QDoc only.
QDoc allows linking to C++ API, QML API, other QDoc projects, and external sites. The QDoc Manual has a linking guide.
 
== Enabling Linking to Content Outside a Module ==
 
To link to a section, API, or page outside of the documentation project (content not included in the .qdocconf file), the module name must be set to the '''depends''' qdocconf variable.<br /><code>depends ''= qtcore qtxmlpatterns qtqml qtgui qtlinguist <code>
<br />The depends entry corresponds to the directories found in the '''QT_INSTALL_DOCS''' directory.
<br />'''Note''': To link to pages outside of the module, consider using the '''[]''' syntax as explained in the ''Resolving Ambiguous or Colliding Link Names'' section below.
<br />h2. Using QDoc's Autolink Feature
<br />QDoc detects certain keywords such as C''+ class names and attempts to link create links to them. Therefore, there is no need<br />to use the ''' command to create a link.
<br />h2. Using the Command
<br />In general, to create a link, use the''' command followed by the link name.<br /></code><br />{Link Name}<br /><code><br />Valid link names include:<br />* Page title<br />* Class name<br />* QML Type name<br />* Targets created by ''' and'''<br />* HTTP URLs<br />* Section titles with the '''PageTitle#SectionTitle''' syntax<br />* API members such as properties and functions with the '''APIPage::member''' syntax. For example '''Button::checked'''
 
'''Notes:'''
 
* The parentheses '''''' after QML or C++ functions are required, while for QML properties they are not required.<br />For example:<br /></code><br />{Button::checked} - creates a link to the Button's checked property<br />{Button::clicked()} - creates a link to the Button's clicked() signal<br /><code>
* Typing '''{Button::}{clicked()}''' is a convenient shortcut for displaying a link to Button::clicked() as ''clicked()''.
 
* The space after the is not necessary if it is followed with '''{}''' as it adds unnecessary whitespace. Instead of {Page},<br />type either '''{Page}''' or when there is only one word, '''Page'''.
 
=== Visible Text ===
 
Sometimes, to integrate the link name into the sentence or clause, the visible text is necessary.
 
* The '''{Signals &amp; Slots#Advanced Signals and Slots Usage}{advanced signals and slots example}''' demonstrates a<br />use for QSignalMapper.


== Resolving Ambiguous or Colliding Link Names ==
* [https://doc.qt.io/qt-6/qdoc-index.html QDoc Manual]
* [https://doc.qt.io/qt-6/08-qdoc-commands-creatinglinks.html Creating Links]


To disambiguate links, QDoc allows the author to specify the QDoc project and the type of API using<br />'''[]''' after the link command.
== Linking to QDoc projects or Qt modules ==


For example:<br />* '''[QML]{EnginioClient}''' - creates a link to the EnginioClient QML type<br />* '''[CPP]{EnginioClient}''' - creates a link to the EnginioClient C++ class<br />* '''[QtCore]{Qt}''' - creates a link to the Qt namespace<br />* '''[QtQml]{Qt}''' - creates a link to the Qt QML type
To link to other QDoc projects, set the directory name to the '''depends''' variable of your project's .qdocconf file.


Currently only these parameters within '''[]''' are recognized:<br />* '''QML''' - for QML types, enumerations, or other definitions in QML modules (specified with )<br />* '''CPP''' - for C++ APIs<br />* project or module name
For example, to link to Qt Core, Qt QML, Qt GUI, and Qt Linguist pages such as API and examples, set the depends variable with the directory name:
<code>depends += qtcore qtqml qtgui qtlinguist </code>


'''Note:''' The project name is specifed in the QDoc configuration file ('''.qdocconf).
The depends entry corresponds to the directories found in the '''QT_INSTALL_DOCS''' directory.
<br />h2. External Pages
<br />To avoid multiple instances of ''hard-coded'' HTTP URLs, use the''' command to associate the HTTP URL<br />with a title.<br /></code><br />http://www.example.com<br />n Example Page<br /><code><br />'''{An Example Page}''' creates link to http://www.example.com. There is a set of external page in ''qtbase/doc/global/externalsites''<br />directory. The command can be declared in the module documentation directory if it is not used anywhere else in Qt to avoid being<br />unnecessarily included in other modules' index files.


== Various Guidelines ==
For more information about linking to Qt documentation, visit the following pages from the QDoc Manual:


* It is best if the link title and visible text are in the same line so that they are more readable and easily searched.
* [https://doc.qt.io/qt-6/22-qdoc-configuration-generalvariables.html#depends depends variable]
* Be mindful about colliding titles by avoiding certain keywords or by creating descriptive page titles.
* [https://doc.qt.io/qt-6/qdoc-guide-conf.html Creating QDoc Configuration Files]
* Linking directly to the HTML filename should be used as a last resort because the filename can change.
* [https://doc.qt.io/qt-6/25-qdoc-configuration-derivedprojects.html#description Supporting Derived Projects]

Latest revision as of 14:39, 14 October 2024

This page is part of the Qt Writing Guidelines

QDoc allows linking to C++ API, QML API, other QDoc projects, and external sites. The QDoc Manual has a linking guide.

Linking to QDoc projects or Qt modules

To link to other QDoc projects, set the directory name to the depends variable of your project's .qdocconf file.

For example, to link to Qt Core, Qt QML, Qt GUI, and Qt Linguist pages such as API and examples, set the depends variable with the directory name: 

depends += qtcore qtqml qtgui qtlinguist

The depends entry corresponds to the directories found in the QT_INSTALL_DOCS directory.

For more information about linking to Qt documentation, visit the following pages from the QDoc Manual:

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