Qt Essentials▲
Qt Essentials define the foundation of Qt on all platforms. They are available on all supported development platforms and on the tested target platforms. Except the testing modules, which will remain source compatible, these modules will remain source and binary compatible throughout Qt 6.
Essential modules are general and useful for a majority of Qt applications. A module that is used for a special purpose is considered an add-on module even if it is available on all supported platforms.
The following table lists the Qt essentials:
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Module |
Description |
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Core non-graphical classes used by other modules. |
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Classes for inter-process communication over the D-Bus protocol. |
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Base classes for graphical user interface (GUI) components. |
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Classes to make network programming easier and more portable. |
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Classes for QML and JavaScript languages. |
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A declarative framework for building highly dynamic applications with custom user interfaces. |
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Provides lightweight QML types for creating performant user interfaces for desktop, embedded, and mobile devices. These types employ a simple styling architecture and are very efficient. |
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Layouts are items that are used to arrange Qt Quick 2 based items in the user interface. |
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A unit test framework for QML applications, where the test cases are written as JavaScript functions. The binary compatibility guarantee does not apply to Qt Quick Test. However, it will remain source compatible. |
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Classes for unit testing Qt applications and libraries. The binary compatibility guarantee does not apply to Qt Test. However, it will remain source compatible. |
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Classes to extend Qt GUI with C++ widgets. |
Qt Add-Ons▲
Qt Add-On modules bring additional value for specific purposes. These modules may only be available on some development platform. Many add-on modules are either feature-complete and exist for backwards compatibility, or are only applicable to certain platforms. Each add-on module specifies its compatibility promise separately.
The Qt installers include the option of downloading the add-ons. For more information, visit the Getting Started with Qt page.
The following table lists the Qt add-ons:
|
Module |
Development Platforms |
Target Platforms |
Description |
|---|---|---|---|
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Classes for applications which use ActiveX and COM |
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All |
All |
Functionality for near-realtime simulation systems with support for 2D and 3D rendering. |
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All |
All |
Qt Core APIs that were in Qt 5 but not Qt 6. |
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All |
All |
Classes for writing multi-threaded programs without using low-level threading primitives. |
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All |
All |
Classes for integrating documentation into applications. |
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