qtqml.qdoc

Go to the documentation of this file.

// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
 
/*!
\page qtqml-index.html
\title Qt Qml
\brief The Qt Qml module implements the QML language and offers APIs to register
       types for it.
 
The Qt Qml module provides a framework for developing applications and libraries
with the \l{The QML Reference}{QML language}. It defines and implements the
language and engine infrastructure, and provides an API to enable application
developers to \l{Registering QML Types and QML Modules}{register} custom QML types
and modules and integrate QML code with JavaScript and C++. The Qt Qml module
provides both a \l{Qt QML QML Types}{QML API} and a
\l{Qt Qml C++ Classes}{C++ API}.
 
\section1 Using the Module
 
\section2 QML API
 
\include {module-use.qdocinc} {using the qml api} {QtQml}
 
The Qt QML module contains the QML framework and important QML types used in
applications. The constructs of QML are described in the \l{The QML Reference}.
 
The \l{Qt QML QML Types}{QML API} of the Qt QML module provides a number of
\l{qtqml-typesystem-objecttypes.html}{QML Object Types},
\l{qtqml-typesystem-valuetypes.html}{QML Value Types} and namespaces.
 
\section2 C++ API
 
\include {module-use.qdocinc} {using the c++ api}
 
The C++ API contains some
\l{Important C++ Classes Provided By The Qt QML Module}{important classes}
you should get familiar with. It also provides
\l{Integrating with JavaScript values from C++}{types} to hold JavaScript
values.
 
\section3 Building with CMake
 
\include {module-use.qdocinc} {building with cmake} {Qml}
 
To provide foreign QML type support for a non-QML library, locate
the \c QmlIntegration module as follows:
 
\snippet code/doc_src_qtqml.cmake 1
 
See \l{qt6_generate_foreign_qml_types} for details.
 
\section3 Building with qmake
 
\include {module-use.qdocinc} {building_with_qmake} {qml}
 
\section1 Registering QML Types and QML Modules
 
In order to register types for usage with QML you first need to define a
\l{Writing QML Modules}{QML module}, preferably using \l{qt_add_qml_module} in CMake.
Then, you can add C++ headers to your new module, and
\l{Defining QML Types from C++}{define types} to be
\l{Exposing Attributes of C++ Types to QML}{exposed to QML} in them.
 
\section1 Tweaking the engine
 
There are a number of knobs you can turn to customize the behavior of the QML engine.
The page on \l{Configuring the JavaScript Engine}{configuring the JavaScript engine}
lists the environment variables you may use to this effect. The description of the
\l{The QML Disk Cache}{QML Disk Cache} describes the options related to how your QML
components are compiled and loaded.
 
\section1 Articles and Guides
 
These articles contain information about Qt Qml.
 
\list
    \li \l{The QML Reference}
    \li \l{Qt Qml Tooling}
    \li \l{Writing QML Modules}
    \li \l{Singletons in QML}
\endlist
 
\section1 Reference
 
\list
    \li \l {Qt QML C++ Classes} {C++ Classes}
    \li \l {Qt QML QML Types} {QML Types}
\endlist
 
\section1 Licenses and Attributions
 
Qt QML is available under commercial licenses from \l{The Qt Company}.
In addition, it is available under free software licenses. Since Qt 5.4,
these free software licenses are
\l{GNU Lesser General Public License, version 3}, or
the \l{GNU General Public License, version 2}.
See \l{Qt Licensing} for further details.
 
Furthermore Qt QML in Qt \QtVersion may contain third party
modules under following permissive licenses:
 
\generatelist{groupsbymodule attributions-qtqml}
 
*/