Qt Meta Object Compiler Install Google Message. Pack for C# has built- in LZ4 compression which can achieve super fast and small binary size.

I don't think the TIOBE index is a really accurate measure, because it measures popularity, not use. Comparing amount of code in open source repositories like GitHub, Bitbucket, Codeplex, and Sourceforge would give more accurate measurements. (And I believe those more accurate measurements put C and C++ in #1 and #2 spots -- Java has an unfair advantage in the TIOBE index because it's used for freshman college courses, and new programmers make more buzz than experienced ones do) – Jul 1 '11 at 17:22 8. I don't really intend this to be a bashing answer, but these are the reasons I do not personally use Qt. There are plenty of good things to say about it -- namely that the API works most of the time, and that it does seamlessly bridge platforms.

But I do not use Qt, because: • In some cases, it just doesn't look like native programs look. Designing a single UI for all platforms inherently is not going to look right when moved from machine to machine, for various visual styling reasons. For example, on Mac machines, split bars are usually relatively thick, and buttons are small and rounded with icons. On Windows machines, split bars are typically narrow, and buttons are more textual, with more square designs. Just because you can write one UI for every platform does not mean that you should for most applications. • Qt is not a C++ library.

It requires a separate compilation step, which makes the build process much more complicated when compared with most other libraries. • As a result of (2), C++ IDEs and tools can flag Qt expressions as errors, because they do not understand Qt's specifics.

This almost forces use of QtCreator or a textual only editor like vim. • Qt is a large amount of source, which must be present and preinstalled on any machine you use before compiling. This can make setting up a build environment much more tedious. • It's available only under LGPL, which makes it difficult to use single-binary-deployment when one needs to release under a more restrictive or less restrictive license. • It produces extremely large compiled binaries when compared with similarly written 'plain ol' native applications' (excepting of course applications written for KDE). @Dehumanizer: There's the LGPL license, and there's the commercial license. The commercial license is thousands of dollars on the part of the licensee, and does not allow redistribution, etc.

For open source projects under liberal licenses like BSD, MIT, or Boost, where the authors aren't making tons of money and they wish to release their code under a liberal license, a dependency on LGPL is unreasonable, but the developers in question generally cannot afford commercial licensing. – Jul 1 '11 at 6:37 26. #6 is the biggest reason I avoid it. I mean, I don't want a big, clunky program, and I don't like being bound to a specific license, but it's really the lack of a good, native look-and-feel that's a deal-breaker for me. Recent versions of OSX and Windows specifically have done a fantastic job of making their native interfaces pretty, fast, and functional, and I'd rather leverage all the work they've already done for me; I find that many programs without a native look feel cheap and hacky to me (not always, but it wierds me out a bit). – Jul 1 '11 at 7:24 15. Your number 6 should have been number 1.

This is by far the biggest problem with Qt. In many cases, it simply does not use the native APIs. I like my software to look native. Users like that, too.

I've never seen a Mac application created with Qt that looked like a Mac application. Neither have any other Mac users, and they're picky about that sort of thing. You lose all the benefit of it being 'cross-platform' if you're only using it to create Linux applications, which is about the only place it looks native because there really is nothing native. – Jul 1 '11 at 9:07 33. As people say, each tool fits to each problem and situation. But if you're C++ programmer, Qt is your framework.

We develop a complex medical imaging commercial application, and Qt holds on. I don't say that the 'cons' that people say about it are false, but I have the feeling that they don't have tried Qt for a long time (its continously improving on each new version.) And, mostly all of the issues they comment are not a problem if you take care. UI platform inconsistency: only if you use the UI widgets 'as they are', with no customization or custom art. Qt preprocessor overload: Only if you abuse of signal-slot mechanism, or QObject inheritance, when there is no really need. By the way, We still write applications in C#.NET, and been doing it for a long time.

So I think I have enouch perspective. As I said, each tool for each situation, but Qt is with no doubt a consistent and useful framework. @Tom - poor documentation, especially for the new stuff.

The AUI components are barely documented at all with large sections missing, making it difficult to use in a production environment. The documentation for the event process is fundamentally in error with regard to the path that is followed, on win32 at least.

Spent a lot of time yelling at the computer, 'This should be working!!!' Before getting down into the deep processing code to find out that what WX does isn't following the docs and what I was doing would NEVER work. – Jul 1 '11 at 16:57.

I was also disturbed by the acceptance of the property grid library into the main line. I used that library and it showed numerous, fundamental design flaws in addition to actual lack of knowledge on behalf of the programmer who wrote it (called virtual functions in constructors for example). It, and the poor state of AUI, showed a trend to poorer standards. I'm also not a big fan of static event tables, though at least there's another way to respond to events.unlike MFC, which WX is just too much like to be exciting anyway. – Jul 1 '11 at 16:59. Some of it is licensing. See for some of the licensing history.

Until 2000, people who cared strongly about open source, did not use Qt. (This was, in fact, the original motivation for the development of Gnome.) Until 2005, people who wanted to be able to release free software for Windows did not use Qt. Even after that date people who wanted free software under something other than the GPL, simply did not have the option of using Qt. Thus any free software project that is older than those dates, couldn't use Qt. And, of course, people writing proprietary code had to pay for the privilege. Furthermore it is not as it there is a shortage of other options. For instance,, and are all open source, cross-platform toolkits.

Furthermore for a long time Windows was so dominant on the desktop that a lot of software was content to only run on Windows. If you install the Microsoft toolchain, it is easier just to use Microsoft's proprietary stuff than it is to worry about anything else, and a lot of programmers did just that. One reason to not use Qt is that if you only write for one architecture, such as Windows, you may want to use C#/.NET (or Cocoa on Mac) because they will invariably be able to take advantage of the latest bells-and-whistles of the OS. If you are writing cross-platform apps, then you may already be heavily vested in another technology such as Java (i.e.

You work in a 'Java Shop'). Your choice of technology might be dictated by the ecosystem in which you are developing, such as language-specific APIs.

In these sorts of cases, minimizing the number of technologies may be beneficial. A third reason that I can think of is that Qt is based around C++, and C++ is a comparatively difficult/dangerous language to program in. I think it is a language for professionals. If you need to have top performance and are capable of being meticulous, then C++ is probably still the best game in town. Actually, Qt ameliorates a lot of the memory management problems if you set things up to fall out of scope.

Also, Qt itself does a good job insulating the user from a lot of the nasty C++ issues. Every language and framework has its pros and cons. It is a very, very complicated issue that usually can be summarized by the addage often seen in diners: Speed, Quality, and Price (but you can only pick two). Although the rules say I should keep focused on answering the question, I do want to rebut some of the issues raised by Billy ONeal, who I think does a good job summarizing the commonly cited reasons to not use Qt: • Qt is indeed a C++ library/framework/header files. It is augmented by a macro processor (moc) which enables signals and slots, among many other things.

It transforms additional macro commands (such as Q_OBJECT) so that classes have introspection and all sorts of other goodies that you might think of as adding Objective-C functionality to C++. If you know enough about C++ to be offended by this lack of purity, i.e.

You are a pro, then 1) don't use Q_OBJECT and its ilk or 2) be grateful that it does this, and program around the very limited corner cases where this causes a problem. For folks who say 'Use Boost for signals and slots!' Then I would retort that you are exchanging one 'problem' for another. Boost is huge, and it has its own commonly-cited issues such as poor documentation, horrendous API, and cross-platform horrors (think old compilers like gcc 3.3 and big iron compilers like AIX). • For editor support, this also follows from 1, I somewhat agree. Actually, Qt Creator is IMHO the best graphical C++ editor, period, even if you don't use the Qt stuff.

Many professional programmers use emacs and vim. Also, I think Eclipse handles the additional syntax. Thus, no problems with the Qt macros (Q_OBJECT) or signals/slots additions. You will probably not find these macros in Visual Studio, because (I concede) they are additions to C++. But by and large, C#/.NET folks aren't going to be using Qt anyway, due to the fact that they have a lot of the functionality covered with their own proprietary techniques. • As to the size of the Qt source, so long as it compiles overnight, who cares? I compiled Qt 4 on my dual core Macbook in 'less than overnight.'

I certainly hope this is not what is driving your decision to use or not use a particular technology. If this is truly a problem, then you can download the precompiled SDKs for Mac, Linux, and Windows from the Qt website. • Licensing is available in three choices: 1) Proprietary license in case you wish to modify Qt ITSELF and not share, or hide the fact that one is using Qt and not willing to give attribution (could be very important for branding and image!) 2) GPL and 3) LGPL. Yes, there are issues with static linking (rolling all of Qt into the binary) -- but I think that's more because one can't peek inside and notice that you are using Qt (attribution!). I tried to buy a proprietary license from Digia, and they told me 'for what you are doing, you really don't need it.' From a business who is in the business of selling licenses. • The size of the binary/bundle is because you have to distribute the Qt stuff to folks who don't have it: Windows already has?

The Visual Studio stuff or you have to install the run-time. Mac already comes with the enormous Cocoa, and can be dynamically linked. Though I don't do a lot of distribution, I have never found much issue with distributing the ~50 megabyte static file (which I can make even smaller with some of the binary stripper/compression utilities like UPX). I just don't care enough to do this, but if bandwidth were ever an issue, I would add a UPX step to my build script.

• What defines 'Native Look and Feel?' I think 'most' would agree that Mac comes closest to unified look and feel. But here I sit, looking at Safari, iTunes, Aperture, Final Cut Pro, Pages, etc.

And they look nothing alike despite the fact that they are made by the OS vendor. I think the 'feel' aspect is more relevant: widget styling, responsiveness, etc. If you care about responsiveness, then here is a good reason to use C++ rather than Java, or some other highly dynamic language. (Objective C also rocks, but I'm trying to dispel myths about Qt) In summary, it's a complicated issue. But I would like to point out that I think there are less reasons to 'not use Qt' as one might think based on myths and decade-out-of-date information. I agree with nearly all of the reasons discussed above however a lot of people here have said they wouldn't use Qt because of the extra overhead that it brings with it. I disagree with that because all the most common languages today (Java, C# and Python) carry a fair bit of overhead themselves.

Secondly, Qt makes programming with C++ so easy and straight-forward that it makes up for the extra resources it uses. I've come across quite a few console applications written in Qt rather than standard C++ because of the ease in which they can be written. I would say that the productivity of Qt is greater than that of C/C++ but less than languages like Python. The reason is simple: it does not have good bindings to all mainstream languages, and it is not magically always appropriate for the job at hand. Use the right tool for the job. If I'm writing a simple command-line application, why would I bloat that up with Qt just for the sake of it?

As a more general answer (which I can give because I'm relevant here), some programmers will simply never have given it a go and decided to use it. In some cases there is no particular reason other than the programmer has never found a need for it and looked into it. This genuinely isn't an attempt to start a flame war, I just wanted to address some of the points. Probably the real reason that Qt isn't more widely used is that it's C++ and fewer people use c++ for desktop apps. Qt is not a C++ library.

It requires a separate compilation step, which makes the build process much more complicated when compared with most other libraries. The vs-addin for visual studio does this automatically as does Qt's own commandline make process. The resource compiler used to build the dialogs for MFC is also a separate step but that's still c++. Qt is a large amount of source, which must be present and preinstalled on any machine you use before compiling. This can make setting up a build environment much more tedious. There is a binary download for each version of visual studio and the build from source is a single command. I don't see SDK source size is so much of a deal these days.

Visual studio now installs all the C++ libs rather than letting you pick and choose, as a result the install size of the compiler is >1Gb. It's available only under LGPL, which makes it difficult to use single-binary-deployment when one needs to release under a more restrictive or less restrictive license. The LGPL only applies to the lib, it doesn't affect your code. Yes it means you have to ship DLLs rather than a single binary (unless you pay), but in a world where you need to download a Java runtime or a.Net update for a tiny util this isn't such a big deal. It's also less of a problem on platforms with a single ABI so that other Qt apps can share the libs. In some cases, it just doesn't look like native programs look.

Designing a single UI for all platforms inherently is not going to look right when moved from machine to machine, for various visual styling reasons. It's supposed to use native widgets and themes. I must admit I do mostly technical apps so my users aren't too concerned about style.

Especially on windows the new fashion for having everything style itself as a smartphone widget means that there is less and less of a standard anyway. Quite a lot of large software companies build commercial applications in C++ but I'm not aware of very many that use QT. So, while I understand that non-C++ developers might avoid QT, there are other reasons to avoid QT even when you are writing a C++ app, it would seem. In fact, there really isn't any cross platform language and GUI toolkit that I can't find fault with. It seems that cross-platform development is JUST PLAIN HARD, and that doing it well is never easy or free, and that the promise QT makes (Write your GUI once and reuse that GUI everywhere) isn't enough.

– Nov 20 '12 at 19:45. Most desktop C++ software is either in MFC because it started 20years ago or uses an internal toolkit started 20years ago to avoid MFC (eg MS-Office or Autocad).

I doubt very much is being written in C++/CLR with WPF. But even without cross-platform considerations I find Qt the best (or least worst!) desktop toolkit. Like most people we are moving toward a webby front end (possibly in QtQuick/QML) and a C++ server backend - which will probably use Qt signals/slots but no gui – Nov 20 '12 at 19:52.

• (1991–2008) • (2008–2011) • (2011–present) • (2012–2014) • (2014–present) Initial release 20 May 1995; 22 years ago ( 1995-05-20) 5.9.3 (22 November 2017; 32 days ago ( 2017-11-22)) Development status Active Written in,, (,, ),,,, Website Qt ( 'cute' ) is a that is used for developing that can be run on various software and hardware platforms 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 both by, a publicly listed company, and the under, involving individual developers and firms working to advance Qt. Qt is available with both proprietary and open source 2.0, GPL 3.0, and 3.0 licenses. Contents • • • • • • • • • • • • • • • • • • • • • • • • • • Purposes and abilities [ ] Qt is used for developing multi-platform and (GUIs); however, programs without a GUI can be developed, such as tools and consoles for servers. An example of a non-GUI program using Qt is the Cutelyst. GUI programs created with Qt can have a native-looking interface, in which case Qt is classified as a.

It has extensive support. Non-GUI features include database access, parsing, parsing, management and network support.

Programming language bindings [ ]. Main articles: and Qt uses standard with extensions including that simplify handling of events, and this helps in development of both GUI and server applications which receive their own set of event information and should process them accordingly. Qt supports many compilers, including the C++ compiler and the suite. Qt also provides, that includes a called that allows using to provide the logic. With Qt Quick, rapid application development for mobile devices became possible, although logic can be written with native code as well to achieve the best possible performance. Qt can be used in several other via.

It runs on the major desktop platforms and some of the mobile platforms. Qt market [ ]. See also: and Notable applications using Qt or are: • • • AMD's Crimson Edition driver tool application. • • • editor • stop motion animation software • free open source numerical computing environment • • graphics editing and digital painting software •, a mathematical symbolic computation program, sometimes termed a computer algebra system or program, used in many scientific, engineering, mathematical, and computing fields. See also: Editions [ ] There are four editions of Qt available: Community, Indie Mobile, Professional and Enterprise.

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. Psychology Books In Hindi Pdf Free Download on this page. Enterprise Controls are commercially sold by The Qt Company. Licensing [ ] Qt is available under the following free software licenses:, and (with Qt special exception). Note that some modules are only available under a GPL license, which means that applications which statically link to these modules need to comply with that license. In addition, Qt has always been available under a commercial license, like the, that allows developing proprietary applications with no restrictions on licensing. Software architecture [ ]. Example of Qt usage in Linux-based systems Qt, when it was first released, relied on a few key concepts: Complete abstraction of the GUI 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 depended really 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 much. 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, uses the toolkits of the target platform for its implementations.

Signals and slots A language construct introduced in for communication between objects which makes it easy to implement the while avoiding. The concept is that GUI can send signals containing event information which can be received by other controls using special functions known as slots. Compiler The 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 with meta information about the classes used in the program. This meta information is used by Qt to: signals and slots, and asynchronous function calls. Qt tools [ ]. See also: 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.

Is a cross-platform for C++ and QML. 's 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, a cross-platform 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).

Supported platforms [ ]. Main article: Qt works on many different platforms; the following are officially supported: Platform Description Linux/Unix X11 Qt for (,,,,, etc.) Wayland Qt for. Qt applications can switch between graphical backends like X and Wayland at with the -platform command line option.

This allows a seamless transition of Qt applications from X11 to Wayland. Embedded Linux Qt for embedded platforms:,, etc. Exists as multiple platforms depending on display technology., and EGLFS ( Full Screen).

Android Qt for, formerly known as Necessitas. Apple Platforms macOS Qt for Apple; supports applications on iOS Qt for platforms (, ) Microsoft Platforms Windows Qt for Microsoft,,, and Windows CE Qt for and. Windows RT Support for -based apps and With 5.4 minimum supported version: Other Embedded Platforms Integrity Qt for QNX Qt for VxWorks Qt for.

After Nokia opened the Qt source code to the community on various ports appeared. There are also some ports of Qt that may be available, but are not supported anymore. These platforms are listed in. Software modules [ ] Starting with Qt 4.0 the framework was split into individual modules. With Qt 5.0 the architecture was modularized even further. Qt is now split into essential and add-on modules. Qt essentials [ ] Module Description Qt Core 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 The central GUI module. In Qt 5 this module now depends on, but no longer contains any widget classes. Qt Widgets Contains classes for classic widget based GUI applications and the QSceneGraph classes. Was split off from QtGui in Qt 5. Qt QML Module for and languages.

Qt Quick The module for GUI application written using QML2. Qt Quick Controls Widget like controls for Qt Quick intended mainly for desktop applications. Qt Quick Layouts Layouts for arranging items in Qt Quick.

Qt Network Network abstraction layer. Complete with TCP, UDP,, and since Qt 5.3 support. Qt Multimedia Classes for audio, video, radio and camera functionality. Qt Multimedia Widgets The widgets from Qt Multimedia. Qt SQL Contains classes for database integration using. Qt WebEngine A new set of Qt Widget and QML webview APIs based on.

Qt Test Classes for unit testing Qt applications and libraries. Qt add-ons [ ] Module Description Active Qt Classes for applications which use. Qt Bluetooth Classes accessing hardware. Qt D-Bus Classes for IPC using the protocol.

Qt NFC Classes accessing hardware. Only officially supported on BlackBerry hardware so far (or N9 in the MeeGo port). Qt OpenGL Legacy module containing the classes from Qt 4.

In Qt 5 the similar functionality in Qt GUI is recommended. Qt Location Classes for accessing 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 ), Windows and Sailfish OS.

Legacy module for scripting Qt application using ECMAScript/. In Qt 5, using similar classes in Qt QML is recommended. Qt Sensors 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 Classes for access to hardware and virtual serial ports. Supported on Windows, Linux and macOS.

Qt WebChannel Provides access to Qt objects to HTML/Js over. Qt WebKit Qt's implementation and API. Qt WebKit Widgets The widget API for Qt WebKit Qt WebSockets Provides a implementation. Qt XML Legacy module containing classes for and style APIs.

Replaced with QXmlStreamReader and QXmlStreamWriter classes in Qt Core. Qt XML Patterns Support for,, and validation.

History of Qt [ ]. See also: The upcoming version of Qt is Qt 5.10, which will be released on 30 November 2017 with several new features including initial support for Windows, Linux and Android. The current LTS version of Qt is 5.9 LTS which was released on 31 May 2017 and will be supported for 3 years until 31 May 2020. Early developments [ ] In the summer of 1990, Haavard Nord and Eirik Chambe-Eng (the original developers of Qt and the CEO and President, respectively, of ) were working together on a database application for ultrasound images written in C++ and running on,, and. 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.

The toolkit was called Qt because the letter looked appealing in Haavard's typeface, and 't' was inspired by, the X toolkit. The first two versions of Qt had only two flavors: Qt/X11 for Unix and Qt/Windows for Windows. On 20 May 1995 Troll Tech publicly released Qt 0.90 for X11/Linux with the under the Qt Free Edition License.

This license was viewed as not compliant with the open source principle by the and the free software definition by 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 was going to become one of the leading desktop environments for Linux. As it was based on Qt, many people in the worried that an essential piece of one of their major operating systems would be proprietary. The Windows platform was only available 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 [ ] With the release of version 2.0 of the toolkit, the license was changed to the (QPL), a license, but one regarded by the 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, which guarantees that Qt would fall under a should no free/open source version of Qt be released during 12 months. In 2000, Qt/X11 2.2 was released under the GPL v2, ending all controversy regarding. At the end of 2001, Trolltech released Qt 3.0, which added support for Mac OS X.

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. In 2002, members of the project began porting the GPL licensed Qt/X11 code base to Windows. 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. The project achieved reasonable 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. 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 was later added as an added licensing option.

The GPL exception allows the final application to be licensed under various GPL-incompatible / licenses such as the 1.1. Acquisition by Nokia [ ] Nokia acquired Trolltech ASA on 17 June 2008 and changed the name first to Qt Software, then to Qt Development Frameworks. Since then it focused on Qt development to turn it into the main development platform for its devices, including a port to the. Version 1.0 of the Nokia Qt SDK was released on 23 June 2010.

The source code was made available over Gitorious, a community oriented source code repository, to gather an even broader community that is not only using Qt but also helping to improve it. On 14 January 2009, Qt version 4.5 added another option, the, which should make Qt even more attractive for non-GPL open source projects and for closed applications. In February 2011, Nokia announced its decision to drop Symbian technologies and base their future smartphones on the platform instead. 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, and 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 [ ] In March 2011, Nokia sold the commercial licensing part of Qt to creating Qt Commercial.

In August 2012, Digia announced that it would acquire Qt from Nokia. The Qt team at Digia started their work in September 2012. They released Qt 5.0 within a month and newer versions every 6 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 related to Qt. In May 2016, Digia and Qt demerged completely into two independent companies. The Qt Project and open governance [ ] Qt 5 was officially released on 19 December 2012. This new version marked a major change in the platform, with hardware-accelerated graphics, and 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. Qt 5 brings significant improvements to the speed and ease of developing user interfaces. Framework development of Qt 5 moved to open governance, taking place at qt-project.org. There it is now possible for developers outside Digia to submit patches and have them reviewed. See also [ ] • • • References [ ]. • Bocklage-Ryannel, Juergen; Thelin, Johan (12 May 2015). • Blanchette, Jasmin; Summerfield, Mark (14 February 2008).

• Summerfield, Mark (23 August 2010). • Fitzek, Frank H. P.; Mikkonen, Tommi; Torp, Tony (17 May 2010).

• Summerfield, Mark (28 October 2007). • Molkentin, Daniel (19 July 2007). • Thelin, Johan (3 August 2007).

• Dalheimer, Matthias (January 2002). • Ezust, Alan; Ezust, Paul (10 September 2006). External links [ ] Wikimedia Commons has media related to.

Wikibooks has a book on the topic of: •.