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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms
** and conditions contained in a signed written agreement between you
** and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qtqml-cppclasses-topic.html
\title C++ Classes Provided By The Qt QML Module
\brief Overview of the C++ classes provided by the Qt QML module
The Qt QML module provides C++ classes which implement the QML framework.
Clients can use these classes to interact with the QML run-time (for example,
by injecting data or invoking methods on objects), and to instantiate a
hierarchy of objects from a QML document.
\section1 The QQmlEngine Class
The QQmlEngine class provides an engine which can manage a hierarchy of objects
which is defined in a QML document. It provides a root QML context within
which expressions are evaluated, and ensures that properties of objects are
updated correctly when required.
See \l{qtqml-cppclasses-engine.html}{Qt QML Module C++ Classes - QQmlEngine}
for in-depth information about QQmlEngine.
\section1 The QQmlComponent Class
The QQmlComponent class is used to load a QML document. It requires a
QQmlEngine in order to instantiate the hierarchy of objects defined in the QML
document.
See
\l{qtqml-cppclasses-component.html}{Qt QML Module C++ Classes - QQmlComponent}
for in-depth information about QQmlComponent.
\section1 The QQmlContext Class
The QQmlContext class provides a context for object instantiation and
expression evaluation. All objects are instantiated in a particular context,
and all of the expressions which are evaluated while an application is running
are evaluated within a particular context. This context defines how symbols
are resolved, and thus which values the expression operates on.
See \l{qtqml-cppclasses-context.html}{Qt QML Module C++ Classes - QQmlContext}
for in-depth information about QQmlContext.
\section1 The QQmlExpression Class
The QQmlExpression class provides a way for clients to evaluate JavaScript
expressions from C++, using a particular QML evaluation context. This allows
clients to access QML objects by id, for example. The result of evaluation
is returned as a QVariant, and the conversion rules are defined by the QML
engine.
See \l{qtqml-cppclasses-expression.html}
{Qt QML Module C++ Classes - QQmlExpression} for in depth information about
QQmlExpression.
*/
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