Note that while the Qt QML module provides the language and infrastructure for QML applications, the Qt Quick module provides many visual components, model-view support, an animation framework, and much more for building user interfaces.
For those new to QML and Qt Quick, please see QML Applications for an introduction to writing QML applications.
The QML types in Qt QML are available through the
QtQml import. To use the types, add the following import statement to your .qml file:
Using the C++ API requires linking against the module library, either directly or through other dependencies. Several build tools have dedicated support for this, including CMake and qmake.
find_package() command to locate the needed module components in the Qt6 package:
find_package(Qt6 REQUIRED COMPONENTS Qml) target_link_libraries(mytarget PRIVATE Qt6::Qml)
See also the Build with CMake overview.
To configure the module for building with qmake, add the module as a value of the QT variable in the project's .pro file:
QT += qml
The Qt QML module contains the QML framework and important QML types used in applications. The constructs of QML are described in the The QML Reference.
In addition to the QML Basic Types, the module comes with the following QML object types:
The Qt global object provides useful enums and functions for various QML types.
New in Qt 5.1, the model types are moved to a submodule,
QtQml.Models. The Qt QML Models page has more information.
These sections are from The QML Reference.
- Overview - QML and C++ Integration
- Data Type Conversion Between QML and C++
- Exposing Attributes of C++ Types to QML
- Defining QML Types from C++
- Writing QML Modules
- Important C++ Classes Provided By The Qt QML Module
- Integrating QML and C++
Qt QML is available under commercial licenses from The Qt Company. In addition, it is available under free software licenses. Since Qt 5.4, these free software licenses are GNU Lesser General Public License, version 3, or the GNU General Public License, version 2. See Qt Licensing for further details.
Furthermore Qt QML in Qt 6.2.6 may contain third party modules under following permissive licenses:
BSD 2-clause "Simplified" License
Further information for writing QML applications:
- The QML Reference
- QML Applications - essential information for application development with QML and Qt Quick
- Qt Quick - a module which provides a set of QML types and C++ classes for building user interfaces and applications with QML
- The QML Disk Cache - how to fine tune if and where the QML engine caches compilation results.
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