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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qtwritingstyle-qml.html
\title QML Documentation Style
\brief Style guidelines for QML documentation
QDoc can process QML types defined as C++ classes and QML types defined in
\c .qml files. For C++ classes documented as QML types, the QDoc comments are
in the \c .cpp file while QML types defined in QML are in the \c .qml
file. The C++ classes must also be documented
documented with the QML \l{topic-commands}{topic commands}:
\list
\li \l{qmlattachedproperty-command}{\\qmlattachedproperty}
\li \l{qmlattachedsignal-command}{\\qmlattachedsignal}
\li \l{qmlbasictype-command}{\\qmlbasictype}
\li \l{qmltype-command}{\\qmltype}
\li \l{qmlmethod-command}{\\qmlmethod}
\li \l{qmlproperty-command}{\\qmlproperty}
\li \l{qmlsignal-command}{\\qmlsignal}
\li \l{qmlmodule-command}{\\qmlmodule}
\li \l{inqmlmodule-command}{\\inqmlmodule}
\li \l{instantiates-command}{\\instantiates}
\endlist
For QML types defined in \c .qml files, QDoc will parse the QML and determine
the properties, signals, and the type within the QML definition. The QDoc
block then needs to be immediately above the declaration. For QML types
implemented in C++, QDoc will output warnings if the C++ class documentation
does not exist. The class documentation may be marked as
\l{internal-command}{internal} if it is not a public API.
\section1 QML Types
The \l{qmltype-command}{\\qmltype} command is for QML type documentation.
\snippet examples/qml.qdoc.sample qmltype
The \l{instantiates-command}{\\instantiates} accepts the C++ class which
implements the QML type as the argument. For types implemented in QML, this
is not needed.
The \e{brief description} provides a summary for the QML type. The brief does
not need to be a complete sentence and may start with a verb. QDoc will append
the brief description onto the QML type in tables and generated lists.
\code
\qmltype ColorAnimation
\brief Animates changes in color values
\endcode
Here are some alternate verbs for the brief statement:
\list
\li "Provides..."
\li "Specifies..."
\li "Describes..."
\endlist
The \e{detailed description} follows the brief and may contain images, snippet,
and link to other documentation.
\section1 Properties
The property description focuses on what the property \e does and may use the
following style:
Property documentation usually starts with "This property..." but for certain
properties, these are the common expressions:
\list
\li "This property holds..."
\li "This property describes..."
\li "This property represents..."
\li "Returns \c true when... and \c false when..." - for properties that
are marked \c{read-only}.
\li "Sets the..." - for properties that configure a type.
\endlist
\section1 Signals and Handlers Documentation
QML signals are documented either in the QML file or in the C++ implementation
with the \l{qmlsignal-command}{\\qmlsignal} command. Signal documentation
must include the condition for emitting the signal, mention the corresponding
signal handler, and document whether the signal accepts a parameter.
\snippet examples/qml.qdoc.sample signals
These are the possible documentation styles for signals:
\list
\li "This signal is triggered when..."
\li "Triggered when..."
\li "Emitted when..."
\endlist
\section1 Methods and JavaScript Functions
Typically, function documentation immediately precedes the implementation of the
function in the \c .cpp file. The \l{topic-commands}{topic command} for
functions is \l{fn-command}{\\fn}. For functions in QML or JavaScript, the
documentation must reside immediately above the function declaration.
The function documentation starts with a verb, indicating the operation the
function performs.
\snippet examples/qml.qdoc.sample function
Some common verbs for function documentation:
\list
\li "Copies..." - for constructors
\li "Destroys..." - for destructors
\li "Returns..." - for accessor functions
\endlist
The function documentation must document:
\list
\li the return type
\li the parameters
\li the actions of the functions
\endlist
The \l{a-command}{\\a} command marks the parameter in the documentation.
The return type documentation should link to the type documentation or be
marked with the \l{c-command}{\\c} command in the case of boolean values.
\section1 Enumerations
QML enumerations are documented as QML properties with the
\l{qmlproperty-command}{\\qmlproperty} command. The type of the property
is \c enumeration.
\snippet examples/qml.qdoc.sample enums
The QDoc comment lists the values of the enumeration. If the enumeration is
implemented in C++, the documentation may link to the corresponding C++
enumeration. However, the QDoc comment should advise that the enumeration
is a C++ enumeration.
*/
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