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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Free Documentation License
** 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qml-best-practices-coding.html
\ingroup qml-best-practices
\contentspage QML Best Practices Guides
\previouspage QML Best Practices Guides
\startpage QML Best Practices Guides
\title QML Best Practices: Coding Conventions
\brief QML Coding Conventions and Importing Files
There are many different ways to code using QML. These are a set of
guidelines to help your code look better and consistent.
\section1 Coding Conventions
The official QML Coding Conventions may be found at
\l {QML Coding Conventions}. This is the recommended convention that will be
used throughout the QML documentation.
In addition, Qt's official code style may be found at the \l {Qt Coding Style}.
\section1 Importing Files into QML
To import items such as directories, use the "import" keyword, similar to
the way the \c {import QtQuick 1.0} statement is used.
\qml
import QtQuick 1.0
import QtWebKit 1.0
import "subdirectory"
import "script.js"
\endqml
To facilitate the importation of QML components, it is best to begin the QML
file with an uppercase character. This way, the user can simply declare the
component using the file name as the component name. For example, if a QML
component is in a file named \c Button.qml, then the user may import the
component by declaring a \c {Button {}}. Note that this method only works if
the QML files are in the same directory.
It is also possible to import QML files which have file names that begin in
lower case or files in a different directory by using a \c qmldir file.
A \c qmldir file tells your QML application which QML components, plugins,
or directories to import. The \c qmldir file must reside in an imported
directory. By using the \c qmldir file, users may import any QML file and assign any
valid QML component name to the component.
For more information, read the section on
\l{qml-loading-components}{Loading a Component}.
\section1 Commenting Code
Commenting code allows others to read the source code better. As well, comments
allow the programmer to think about his or her code; a confusing comment may
mean the code is confusing.
Similar to JavaScript or C++, there are two ways of commenting QML code:
\list
\o Single line comments start with \c{//} and finish at the end of the line
\o Multiline comments start with \c{/*} and finish with *\/
\endlist
\section1 Group Properties
Many QML properties are \l{attached-properties}{attached} or
\l {qml-grouped-properties}{group} properties. For convenience, you may treat
them as another element when dealing with multiple properties belonging to the
same group.
\snippet doc/src/snippets/declarative/bestpractices/group.qml not grouped
Treating groups of properties as a block can ease confusion and help relate the
properties with other properties.
\snippet doc/src/snippets/declarative/bestpractices/group.qml grouped
*/
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