Qt State Machine

The State Machine framework provides classes for creating and executing state graphs.

Using the Module

QML API

The QML types of the module are available through the QtQml.StateMachine import. To use the types, add the following import statement to your .qml file:

import QtQml.StateMachine

C++ API

Using a Qt module's 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.

Building with CMake

Use the find_package() command to locate the needed module component in the Qt6 package:

find_package(Qt6 REQUIRED COMPONENTS StateMachine)
target_link_libraries(mytarget PRIVATE Qt6::StateMachine)

For more details, see the Build with CMake overview.

Building with qmake

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 += statemachine

Articles and Guides

• Qt State Machine Overview
• Qt State Machine C++ Guide
• Qt State Machine QML Guide

Examples

• Qt State Machine Examples

Reference

• C++ Classes and Namespaces
• QML Types

Module Evolution

Changes to Qt State Machine lists important changes in the module API and functionality that were done for the Qt 6 series of Qt.

Licenses and Trademarks

The Qt State Machine module is available under commercial licenses from The Qt Company. In addition, it is available under free software licenses: The GNU Lesser General Public License, version 3, or the GNU General Public License, version 2. See Qt Licensing for further details.

Furthermore, Qt State Machine in Qt 6.9.0 may contain third party modules under following permissive licenses: