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GREENWOOD / BLACK WALL STREET WILMINGTON 1898 LITTLE ROCK NINE TUSKEGEE STUDY ROSEWOOD 1923 THE TUSKEGEE AIRMEN SENECA VILLAGE BLACK TOWNS GREENWOOD / BLACK WALL STREET WILMINGTON 1898 LITTLE ROCK NINE TUSKEGEE STUDY ROSEWOOD 1923 THE TUSKEGEE AIRMEN SENECA VILLAGE BLACK TOWNS
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BHP HOME BEFORE AMERICA 1800–1936 1937–1957 1958–1980 1981–2000 2001–PRESENT

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MY'STORY

The MOVE Fire

This is a personal recollection on the Move fire on May 13, 1985 Philadelphia police fired thousands of rounds at the MOVE house, city officials approved dropping an explosive device on the roof, the resulting fire was allowed to burn, 11 people—including five children—died, and 61 homes were destroyed. Philadelphia City Council later called it a “brutal attack carried out by the City of Philadelphia on its own citizens” and acknowledged that no individual faced criminal consequences for the bombing. One timeline correction worth preserving for the BHP record: the major previous MOVE-police confrontation was August 8, 1978, about seven years before the bombing, not a year or two earlier. Officer James Ramp was killed, other police and firefighters were wounded, nine MOVE members were later convicted, and television cameras recorded police beating Delbert Africa during his arrest. The 1985 MOVE Commission later specifically criticized city planners for failing to adequately use lessons from that 1978 confrontation. And that actually strengthens the point you’re making: 1985 did not happen without precedent or institutional memory. There had already been a deadly confrontation with MOVE, years of conflict, negotiations and police involvement before Osage Avenue.

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Wilmington 1898 — An American Coup

Wilmington, North Carolina once had a thriving Black middle class and an elected interracial government. In 1898 white supremacists used violence to overthrow that government, kill Black residents and drive many others from the city.

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Wikipedia

Qt (software)

For the company formerly known as Qt Software, see Qt Group.
Not to be confused with QuickTime.

Qt
Original authorsHaavard Nord and Eirik Chambe-Eng[1]
Developers
Release20 May 1995; 31 years ago (1995-05-20)[1]
Stable release
6.12[2] Edit this on Wikidata / 30 September 2026; 16 days ago (30 September 2026)
Written inC++ (C++17)
Operating systemAndroid, Genode / Sculpt, Haiku, iOS, Linux (embedded, Wayland, X11), macOS, Microsoft Windows, WebAssembly, ...[3]
PlatformCross-platform
TypeCross-platform software and Software development tools
License
Websitewww.qt.io
Repository

Qt (/ˈkjuːt/ pronounced "cute"[7][8]) is a cross-platform application development framework for creating graphical user interfaces as well as cross-platform applications that run on various software and hardware platforms such as Linux, Windows, macOS, Android or embedded systems with little or no change in the underlying codebase while still being a native application with native capabilities and speed.

Qt is currently being developed by Qt Group, a publicly listed company, and the Qt Project under open-source governance, involving individual developers and organizations working to advance Qt.[9][10][11] Qt is available under both commercial licenses[4] and open-source[12] GPL 2.0, GPL 3.0, and LGPL 3.0 licenses.[5][6]

Purposes and abilities

[edit]

Qt is used for developing graphical user interfaces (GUIs) and multi-platform applications that run on all major desktop platforms and mobile or embedded platforms. Most GUI programs created with Qt have a native-looking interface, in which case Qt is classified as a widget toolkit. Non-GUI programs can also be developed, such as command-line tools and consoles for servers. An example of such a non-GUI program using Qt is the Cutelyst web framework.[13]

Qt supports various C++ compilers, including the GCC and Clang C++ compilers and the Visual Studio suite. It supports other languages with bindings or extensions, such as Python via Python bindings[14] and PHP via an extension for PHP5,[15] and has extensive internationalization support. Qt also provides Qt Quick, that includes a declarative scripting language called QML that allows using JavaScript to provide the logic. With Qt Quick, rapid application development for mobile devices became possible, while logic can still be written with native code as well to achieve the best possible performance.

Other features include SQL database access, XML parsing, JSON parsing, thread management and network support.

Releases

[edit]

The latest version of the Qt Framework is Qt 6.11, which was released on 23 March 2026.[16]

Also still supported are versions 6.10 until 7 October 2026 and 6.8 LTS until 8 October 2029. Version 6.5 LTS is supported for commercial users only until 3 April 2026. Additionally, extended support for all versions 5.0 (released in 2012) and newer is available for commercial users.[17]

Minor versions of Qt are typically released twice a year and are supported until one year after release date under standard support conditions. Typically, every third minor version becomes a long-term support version which gets additional patches. LTS versions are supported for commercial users until five years after their release date (three years prior to version 6.8).[17]

Release history

[edit]

The following table summarizes historical Qt releases up to Qt 4.[18]

Version Release date Notes
0.90 20 May 1995 First public pre-release version
1.0 24 September 1996 First stable release
1.45 1999 Last release of the Qt 1 series.

On 14 October 2016, the KDE community released a restored variant of Qt 1.45 adapted to run on modern Linux systems.[19]
2.0 26 June 1999 Qt/X11 released under the QPL
2.1 13 April 2000
2.2 7 December 2000 First release available under the GNU GPL v2
2.3 8 March 2001
3.0 16 October 2001
3.1 14 November 2001
3.2 24 July 2003
3.3 5 February 2004 Improved internationalization, Unicode maturity, Mac support improvements.
4.0 28 June 2005 Major architecture redesign. Arthur painting framework, Model/View framework, Integration of formerly commercial technologies.
4.1 20 December 2005
4.2 4 October 2006 First mainstream Qt release with SVG support and improved OpenGL integration.
4.3 30 May 2007
4.4 6 May 2008
4.5 3 March 2009 Begin of Qt Creator integration era. WebKit becomes a core component.
4.6 1 December 2009 Animation Framework, State Machine Framework, Graphics View improvements.
4.7 21 September 2010 QML and Qt Quick introduced.
4.8 15 December 2011 Final feature release of Qt 4. long-term maintained branch until transition to Qt 5.
4.8.7 26 May 2015 Final release of the Qt 4 series

Qt 5

[edit]

Qt 5 was released on 19 December 2012 and introduced a significantly revised architecture focused on graphical performance, mobile and embedded platforms, and improved modularization. Several Qt 5 releases were designated as long-term support (LTS) releases. Qt 5.15, released on 26 May 2020, was the final feature release of the Qt 5 series. Standard support ended on 26 May 2023, while extended support for subscription license holders continued until 26 May 2025.[20]

Version Release date Support end
(extended) 		Notes
5.0 19 December 2012 19 June 2013 First Qt 5 release. Introduced the Qt Platform Abstraction (QPA), a new graphics architecture and improved support for mobile platforms.
5.1 19 June 2013 iOS and Android support promoted from technology preview. Introduced Qt Quick Controls.
5.2 19 December 2013 First release with official support for iOS, Android and WinRT.
5.3 20 May 2014 Introduced support for Qt WebEngine based on Chromium.
5.4 11 December 2014 Expanded Qt Quick functionality and improved multimedia support.
5.5 30 June 2015 Qt WebEngine declared production ready.
5.6 LTS 16 March 2016 16 March 2019 First Qt 5 LTS release. Added support for Windows 10, Windows Universal Apps and improved high-DPI support.
5.7 16 June 2016 Added preliminary support for macOS Sierra and modern C++ features.
5.8 23 January 2017 Improved Qt Quick performance and support for modern graphics APIs.
5.9 LTS 31 May 2017 Added configuration support for high-DPI displays and substantial Qt Quick performance improvements.
5.10 6 December 2017 Introduced Qt Quick Controls 2 as the recommended controls framework.
5.11 12 June 2018 Improved tooling and performance across Qt Quick and embedded platforms.
5.12 LTS 4 December 2018 Added WebGL streaming support through Qt for WebAssembly. Last Qt version to provide an offline installer.
5.13 18 June 2019 11 December 2019 Continued expansion of WebAssembly support and improvements to Qt Quick.
5.14 11 December 2019 Added support for modern graphics APIs including Vulkan, Metal and Direct3D through the Rendering Hardware Interface (RHI).
5.15 LTS 26 May 2020 26 May 2023
(26 May 2025) 		Final feature release of the Qt 5 series. Introduced Qt Quick 3D and completed the transition towards Qt 6. Extended support for subscription license holders continued until 26 May 2025.

Qt 6

[edit]

Qt 6 was released on 8 December 2020 as the successor to Qt 5. It introduced a modernized graphics architecture centered around the Rendering Hardware Interface (RHI), significant improvements to Qt Quick and QML, a revised module structure, and the transition away from several deprecated Qt 5 technologies.[21]

Qt follows a time-based release model with new feature releases approximately twice per year. Selected releases are designated as Long-Term Support (LTS) releases for commercial customers. Since Qt 6.8, the commercial LTS support period has been extended from three to five years.[22]

Version Release date Support end Notes
6.0 8 December 2020 — Initial Qt 6 release; introduced the Rendering Hardware Interface (RHI), modernized graphics stack and revised module structure.
6.1 4 May 2021 — Incremental improvements and expanded platform support.
6.2 (LTS) 30 September 2021 September 2024 First Qt 6 long-term support release; improved stability, performance and platform support.
6.3 31 March 2022 — New APIs and framework refinements.
6.4 29 September 2022 — Multimedia improvements, enhanced WebEngine support and Qt Quick enhancements.
6.5 (LTS) 3 April 2023 April 2026 Long-term support release; performance improvements, updated modules and continued Qt 5 migration support.
6.6 11 October 2023 — Performance optimizations, tooling improvements and expanded platform support.
6.7 2 April 2024 — New Qt Quick capabilities, graphics improvements and framework refinements.
6.8 (LTS) 8 October 2024 October 2029 Long-term support release; Qt Graphs, Qt GRPC and Qt HTTP Server promoted from technical preview. Beginning with Qt 6.8, commercial LTS releases are supported for five years.
6.9 31 March 2025 — OAuth2 improvements, updated emoji rendering, Qt Quick enhancements and Qt Quick 3D updates.
6.10 17 September 2025 — Flexbox layouts for Qt Quick, accessibility improvements and vector animation enhancements.
6.11 18 March 2026 — Hardware-accelerated 2D rendering improvements, Qt Quick 3D enhancements, interactive graphing additions and asynchronous programming improvements.
6.12 (LTS) 30 September 2026 September 2031 Long-term support release; EU Cyber Resilience Act compliance, Qt Canvas Painter, performance improvements, QML hot reloading and HarmonyOS support.

  Supported release   Unsupported release

Qt in use

[edit]

In 2017, Qt Group estimated a community of about 1 million developers worldwide[23] in over 70 industries.[24]

Desktop UIs

[edit]
KDE's mascot Konqi

Graphical user-interfaces and desktop environments that utilize Qt/QML as widget toolkit:

Embedded and mobile UIs

[edit]
  • Actively developed or maintained
  • Available, but inactive
    • MeeGo handset and tablet UX
    • Qtopia, a system by Nokia for embedded and mobile devices

Applications using Qt

[edit]
See also: Category:Software that uses Qt and Category:Proprietary software that uses Qt

Many notable open-source or proprietary cross-platform software are using Qt or QML:[38]

Organizations using Qt

[edit]

Qt is utilized by a wide range of companies and organizations such as

Qt software architecture

[edit]
Example of Qt usage in Linux-based systems

Qt concepts

[edit]

Qt is built on these key concepts:

Complete abstraction of the GUI

[edit]

When first released, Qt used its own paint engine and controls, emulating the look of the different platforms it runs on when it drew its widgets. This made the porting work easier because very few classes in Qt really depended on the target platform; however, this occasionally led to slight discrepancies where that emulation was imperfect. Recent versions of Qt use the native style APIs of the different platforms, on platforms that have a native widget set, to query metrics and draw most controls, and do not suffer from such issues as often.[97][failed verification] On some platforms (such as MeeGo and KDE) Qt is the native API. Some other portable graphical toolkits have made different design decisions; for example, wxWidgets uses the toolkits of the target platform for its implementations.

Signals and slots

[edit]

Signals and slots are a language construct introduced in Qt for communication between objects[98] which makes it easy to implement the observer pattern while avoiding boilerplate code. The concept is that GUI widgets can send signals containing event information which can be received by other controls using special functions known as slots.

Metaobject compiler

[edit]

The metaobject compiler, termed moc, is a tool that is run on the sources of a Qt program. It interprets certain macros from the C++ code as annotations, and uses them to generate added C++ code with meta information about the classes used in the program. This meta information is used by Qt to provide programming features not available natively in C++: signals and slots, introspection and asynchronous function calls.

Qt moc does not recognise modules in its preprocessor currently.[99]

Language bindings

[edit]

Qt can be used in several programming languages other than C++, such as Python, JavaScript, C# and Rust[100] via language bindings; many languages have bindings for Qt 5 and bindings for Qt 4.

In 2025 Qt Group announced a new "bridging technology"[101] that aimed to re-think the way of interacting with new languages, listing that a proof of concept was being worked on for integrating C#, Rust, Swift, Java/Kotlin, and Python.

Qt modules

[edit]

Starting with Qt 4.0 the framework was split into individual modules.[102][103] With Qt 5.0 the architecture was modularized even further.[104][105] Qt is now split into essential and add-on modules.[106]

Qt classes by default do not reside in any namespace, but all classes are prefixed with the letter Q. Qt can be configured to be compiled to reside in a user-defined namespace.[107] Qt is entirely provided through header files, and does not currently support C++ modules.

Qt essentials

[edit]
Module Header Description
Qt Core <QtCore> The only required Qt module, containing classes used by other modules, including the meta-object system, concurrency and threading, containers, event system, plugins and I/O facilities.
Qt GUI <QtGui> The central GUI module. In Qt 5 this module now depends on OpenGL, but no longer contains any widget classes.
Qt Widgets <QtWidgets> Contains classes for classic widget based GUI applications and the QSceneGraph classes. Was split off from QtGui in Qt 5.
Qt QML <QtQml> Module for QML and JavaScript languages.
Qt Quick <QtQuick> The module for GUI applications written using QML2.
Qt Quick Controls <QtQuickControls> Widget like controls for Qt Quick intended mainly for desktop applications.
Qt Quick Layouts <QtQuickLayouts> Layouts for arranging items in Qt Quick.
Qt Network <QtNetwork> Network abstraction layer. Complete with support for TCP, UDP, HTTP, TLS, SSL (in Qt 4) and SPDY (since Qt 5.3).
Qt Multimedia <QtMultimedia> Classes for audio, video, radio and camera functionality.
Qt Multimedia Widgets <QtMultimediaWidgets> The widgets from Qt Multimedia.
Qt SQL <QtSql> Contains classes for database integration using SQL.
Qt WebEngine <QtWebEngine> A new set of Qt Widget and QML webview APIs based on Chromium.
Qt Test <QtTest> Classes for unit testing Qt applications and libraries.

Qt add-ons

[edit]
Module Header Description
Active Qt <QtActive> Classes for applications which use ActiveX.
Qt Charts <QtCharts> Provides functionality and widgets to plot charts of many kinds
Qt Bluetooth <QtBluetooth> Classes accessing Bluetooth hardware.
Qt D-Bus <QtDBus> Classes for IPC using the D-Bus protocol.
Qt NFC <QtNfc> Classes accessing NFC hardware. Only officially supported on BlackBerry hardware so far (or N9 in the MeeGo port).
Qt OpenGL <QtOpenGL> Legacy module containing the OpenGL classes from Qt 4. In Qt 5 the similar functionality in Qt GUI is recommended.
Qt Location <QtLocation> Classes for accessing GPS and other location services and for mapping and navigation. Split off from the Qt 4 Mobility module of Qt Location. Supported on Android, BlackBerry, iOS, Linux (using GeoClue), Windows and Sailfish OS.
Qt Quick 3D <Qt3D> Classes for rendering 3D models, video games, simulations and 3D user interfaces, with a Qt QML API, into a mixed 2D and 3D scene graph.
Qt Script <QtScript> Legacy module for scripting Qt application using ECMAScript/JavaScript. In Qt 5, using similar classes in Qt QML is recommended.
Qt Sensors <QtSensors> Classes for accessing various mobile hardware sensors. Used to be part of Qt Mobile in Qt 4. Supported on Android, BlackBerry, iOS, WinRT, Mer and Linux.
Qt Serial Port <QtSerialPort> Classes for access to hardware and virtual serial ports. Supported on Windows, Linux and macOS.
Qt WebChannel <QtWebChannel> Provides access to Qt objects to HTML/Js over WebSockets.
Qt WebKit <QtWebKit> Qt's WebKit implementation and API.
Qt WebKit Widgets <QtWebKitWidgets> The widget API for Qt WebKit
Qt WebSockets <QtWebSockets> Provides a WebSocket implementation.
Qt XML <QtXml> Legacy module containing classes for SAX and DOM style XML APIs. Replaced with QXmlStreamReader and QXmlStreamWriter classes in Qt Core.
Qt XML Patterns <QtXmlPatterns> Support for XPath, XQuery, XSLT and XML Schema validation.

Editions

[edit]

There are four editions of Qt available: Community, Indie Mobile, Professional and Enterprise.[108] The Community version is under the open source licenses, while the Indie Mobile, Professional and Enterprise versions, which contain additional functionality and libraries, e.g. Enterprise Controls[108] are commercially sold by Qt Group.

Supported platforms

[edit]
Main article: List of platforms supported by Qt

Qt works on many different platforms; the following are officially supported:

Platform Description
Linux/Unix
X11 Qt for X Window System (Linux);[109] FreeBSD, NetBSD, OpenBSD, and DragonFly BSD have community support.
Wayland Qt applications can switch between graphical backends like X and Wayland at load time with the -platform command line option.[110][111] This allows a seamless transition of Qt applications from X11 to Wayland. SailfishOS uses Wayland only as it does not have X11.[112]
Android Qt for Android[113] (formerly known as Necessitas).[114]
Embedded Linux Qt for embedded platforms: personal digital assistant, smartphone, etc.[115] Exists as multiple platforms depending on display technology. DirectFB, LinuxFB and EGLFS (EGL Full Screen).
Microsoft platforms
Windows Qt for Microsoft Windows 7, 8, 10, and 11, as well as UWP 10[116]
Windows RT Support for WinRT-based Windows 10 Mobile apps and Windows 10 IoT[117]
Apple platforms
macOS Qt for Apple macOS; supports applications on Cocoa[118]
iOS Qt for iOS platforms (iPhone, iPad)[119]
Other embedded platforms
Integrity Qt for Integrity[120]
QNX Qt for QNX[121][122]
VxWorks Qt for VxWorks.[123][124] Only available under a proprietary (commercial) license. Qt 5.5.
QT for MCUs QT for MCUs[125]

After Nokia opened the Qt source code to the community on Gitorious, various ports appeared. There are also some ports of Qt that may be available, but are not supported anymore. These platforms are listed in List of platforms supported by Qt. See also there for current community support for other lesser known platforms, such as SailfishOS.

Licensing

[edit]

Qt is available under the following free software licenses:[12] GPL 2.0, GPL 3.0, LGPL 3.0 and LGPL 2.1 (with Qt special exception).[5][126] Note that some modules are available only under a GPL license, which means that applications which link to these modules need to comply with that license.[127]

In addition, Qt has always been available under a commercial license, like the Qt Commercial License,[4] that allows developing proprietary applications with no restrictions on licensing.

Qt tools

[edit]
See also: Qt Creator

Qt comes with its own set of tools to ease cross-platform development, which can otherwise be cumbersome due to different set of development tools.

Qt Creator is a cross-platform IDE for C++ and QML. Qt Designer's GUI layout/design functionality is integrated into the IDE, although Qt Designer can still be started as a standalone tool.

In addition to Qt Creator, Qt provides qmake, a cross-platform build script generation tool that automates the generation of Makefiles for development projects across different platforms. There are other tools available in Qt, including the Qt Designer interface builder and the Qt Assistant help browser (which are both embedded in Qt Creator), the Qt Linguist translation tool, uic (user interface compiler), and moc (Meta-Object Compiler).

History of Qt

[edit]

Early developments

[edit]

In the summer of 1990, Haavard Nord and Eirik Chambe-Eng (the original developers of Qt and the CEO and President, respectively, of Qt Group) were working together on a database application for ultrasound images written in C++ and running on the classic Mac OS, Unix, and Microsoft Windows.[1][128] They began development of "Qt" in 1991, three years before the company was incorporated as Quasar Technologies, then changed the name to Troll Tech and then to Trolltech.[1]

The toolkit was called Qt because the letter Q looked appealing in Haavard's Emacs typeface, and "t" was inspired by Xt, the X toolkit.[1]

The first two versions of Qt had only two flavors: Qt/X11 for Unix and Qt/Windows for Windows.

On 20 May 1995 Trolltech publicly released Qt 0.90 for X11/Linux with the source code under the Qt Free Edition License.[129][130][131] This license was viewed as not compliant with the free software definition by Free Software Foundation because, while the source was available, it did not allow the redistribution of modified versions. Trolltech used this license until version 1.45. Controversy erupted around 1998 when it became clear that the K Desktop Environment was going to become one of the leading desktop environments for Linux. As it was based on Qt, many people in the free software movement worried that an essential piece of one of their major operating systems would be proprietary.

The Windows platform was available only under a proprietary license, which meant free/open source applications written in Qt for X11 could not be ported to Windows without purchasing the proprietary edition.

Becoming free software–friendly

[edit]

With the release of version 2.0 of the toolkit in mid-1999, the license was changed to the Q Public License (QPL), a free software license, but one regarded by the Free Software Foundation as incompatible with the GPL. Compromises were sought between KDE and Trolltech whereby Qt would not be able to fall under a more restrictive license than the QPL, even if Trolltech was bought out or went bankrupt. This led to the creation of the KDE Free Qt foundation,[132] which guarantees that Qt would fall under a BSD-style license should no free/open source version of Qt be released during 12 months.[133][134]

In 2000, Qt/X11 2.2 was released under the GPL v2,[135] ending all controversy regarding GPL compatibility.

At the end of 2001, Trolltech released Qt 3.0, which added support for Mac OS X (now known as macOS). The Mac OS X support was available only in the proprietary license until June 2003, when Trolltech released Qt 3.2 with Mac OS X support available under the GPL.[136]

In 2002, members of the KDE on Cygwin project began porting the GPL licensed Qt/X11 code base to Windows.[137] This was in response to Trolltech's refusal to license Qt/Windows under the GPL on the grounds that Windows was not a free/open source software platform.[138][139] The project achieved some success although it never reached production quality.

This was resolved when Trolltech released Qt 4.0 also for Windows under the GPL in June 2005.[140] Qt 4 supported the same set of platforms in the free software/open source editions as in the proprietary edition, so it is possible, with Qt 4.0 and later releases, to create GPL-licensed free/open source applications using Qt on all supported platforms. The GPL v3 with special exception[141] was later added as an added licensing option. The GPL exception allows the final application to be licensed under various GPL-incompatible free software/open source licenses such as the Mozilla Public License 1.1.

Acquisition by Nokia

[edit]

Nokia acquired Trolltech ASA on 17 June 2008 and changed the name first to Qt Software, then to Qt Development Frameworks.[142]

Nokia focused on turning Qt into the main development platform for its devices, including a port to the Symbian S60 platform. Version 1.0 of the Nokia Qt SDK was released on 23 June 2010.[143] The source code was made available over Gitorious, a community oriented git source code repository, with a goal of creating a broader community using and improving Qt.

On 14 January 2009, Qt version 4.5 added another option, the LGPL,[144] to make Qt more attractive for both non-GPL open source projects and closed applications.[145]

In February 2011, Nokia announced its decision to discontinue Symbian technologies and base their future smartphones on the Windows Phone platform instead (and since then support for that platform has also been dropped).[146] One month later, Nokia announced the sale of Qt's commercial licensing and professional services to Digia, with the immediate goal of taking Qt support to Android, iOS and Windows 8 platforms, and to continue focusing on desktop and embedded development, although Nokia was to remain the main development force behind the framework at that time.

Merging and demerging with Digia

[edit]

In March 2011, Nokia sold the commercial licensing part of Qt to Digia, creating Qt Commercial.[147] In August 2012, Digia announced that it would acquire Qt from Nokia.[148] The Qt team at Digia started their work in September 2012.[149] They released Qt 5.0 within a month and newer versions every six months with new features and additional supported platforms.

In September 2014, Digia transferred the Qt business and copyrights to their wholly owned subsidiary, The Qt Company, which owns 25 brands[150] related to Qt. In May 2016, Digia and Qt demerged completely into two independent companies, forming Qt Group.[151]

The Qt Project and open governance

[edit]
Main article: Qt Project

Qt 5 was officially released on 19 December 2012. This new version marked a major change in the platform, with hardware-accelerated graphics, QML and JavaScript playing a major role. The traditional C++-only QWidgets continued to be supported, but did not benefit from the performance improvements available through the new architecture.[152] Qt 5 brings significant improvements to the speed and ease of developing user interfaces.[153]

Framework development of Qt 5 moved to open governance at qt-project.org, which made it possible for developers outside Digia to submit patches for review.[154]

Qt contributors

[edit]
Distribution of non-Digia Qt contributors (2013, Week 18)

Aside from Qt Group, many organizations and individuals using Qt as their development platform participate in the open development of Qt via the Qt Project.[155]

One such Qt contributor is Klarälvdalens Datakonsult AB, a Swedish Qt consulting company.[156] KDAB is involved in many areas, including maintenance of several components.[157][158]

Together with RIM/BlackBerry, KDAB is maintaining the QNX and BlackBerry 10 ports of Qt.[155][159]

Another participator is Intel, contributing for example Wayland support.[160] AudioCodes maintains IBM ClearCase support in Qt Creator.[161]

As a heavy user of Qt, the KDE project submits many patches and features from its developer library KDE Frameworks back to Qt.[162]

See also

[edit]

Bibliography

[edit]

Qt Wiki provides a comprehensive list of English books about Qt.[163] This is a list of notable books:

  • Schlee, Max (19 July 2026). Qt 6.9 Professional Programming with C++ (1st ed.). qt-book.com. ISBN 978-3982908403.
  • Bocklage-Ryannel, Juergen; Thelin, Johan (12 May 2015). "Qt 5 Cadaques" (1st ed.).
  • Blanchette, Jasmin; Summerfield, Mark (14 February 2008). C++ GUI Programming with Qt 4 (2nd ed.). Prentice Hall. ISBN 978-0-13-235416-5.
  • Summerfield, Mark (23 August 2010). Advanced Qt Programming: Creating Great Software with C++ and Qt 4 (1st ed.). Addison-Wesley. ISBN 978-0-321-63590-7.
  • Fitzek, Frank H. P.; Mikkonen, Tommi; Torp, Tony (17 May 2010). Qt for Symbian (1st ed.). Wiley. ISBN 978-0-470-75010-0. Archived from the original on 19 December 2009.
  • Summerfield, Mark (28 October 2007). Rapid GUI Programming with Python and Qt (1st ed.). Prentice Hall. ISBN 978-0-13-235418-9.
  • Molkentin, Daniel (19 July 2007). The Book of Qt 4: The Art of Building Qt Applications (1st ed.). No Starch Press. ISBN 978-1-59327-147-3. Archived from the original on 26 June 2015. Retrieved 18 June 2015.
  • Thelin, Johan (3 August 2007). Foundations of Qt Development (1st ed.). Apress. ISBN 978-1-59059-831-3. Archived from the original on 20 January 2015. Retrieved 18 June 2015.
  • Dalheimer, Matthias (January 2002). Programming with Qt (2nd ed.). O'Reilly Media. ISBN 978-0-596-00064-6.
  • Ezust, Alan; Ezust, Paul (10 September 2006). An Introduction to Design Patterns in C++ with Qt 4 (2nd ed.). Prentice Hall. ISBN 978-0-13-187905-8.

References

[edit]
  1. ^ a b c d e Blanchette, Jasmin; Summerfield, Mark (June 2006). "A Brief History of Qt". C++ GUI Programming with Qt 4 (1st ed.). Prentice-Hall. pp. xv–xvii. Archived from the original on 23 September 2019. Retrieved 5 August 2013.
  2. ^ Volker Hilsheimer (30 September 2026). "Qt 6.12 LTS Released!". Retrieved 2 October 2026.
  3. ^ "Supported Platforms".
  4. ^ a b c "Licenses".
  5. ^ a b c "New agreement with the KDE Free Qt Foundation and changes for the open source version". The Qt Company. Archived from the original on 14 January 2016.
  6. ^ a b "Adding LGPL v3 to Qt". 20 August 2014.
  7. ^ "Qt - About Us". Archived from the original on 22 February 2017.
  8. ^ Ashlee Vance (16 February 2010). "That Smartphone Is So Qt". Retrieved 19 February 2010.
  9. ^ Pintscher, Lydia (21 October 2011). "KDE Applauds Qt's Move to Open Governance". KDE.News. Retrieved 8 May 2013.
  10. ^ Meyer, David (24 October 2011). "Nokia gives Qt open-source governance". ZDNet. Retrieved 8 May 2013.
  11. ^ Knoll, Lars (6 August 2014). "Defragmenting Qt and Uniting Our Ecosystem".
  12. ^ a b "Legal - FAQ - Qt". www.qt.io. The Qt Company. Retrieved 25 April 2019.
  13. ^ "Cutelyst - Home".
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