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1 天前 · Open-source software ( OSS) is computer software that is released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software and its source code to anyone and for any purpose. [1] [2] Open-source software may be developed in a collaborative, public manner.
1 天前 · Mozilla Firefox, or simply Firefox, is a free and open-source[11] web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. It uses the Gecko rendering engine to display web pages, which implements current and anticipated web standards.[12] Firefox is available for Windows 10 or later versions, macOS, and ...
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- Purposes and Abilities
- Qt Releases
- Qt in Use
- Qt Software Architecture
- History of Qt
- See Also
Qt is used for developing graphical user interfaces (GUIs) and multi-platform applications that run on all major desktop platforms and most 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 t...
The latest version is Qt 6.0, which was released on 8 December 2020. The current long-term support(LTS) version is Qt 5.15 LTS. The Qt Company is moving Qt 5.15 To Its Commercial-Only LTS Phase starting on Jan 5th 2021. Also Qt 5.12 is LTS versionActual Version is 5.12.10. The initial release of Qt software was on 20 May 1995.
In 2017, the Qt Company estimated a community of about 1 million developers worldwidein over 70 industries.
Qt concepts
Qt is built on these key concepts: Complete abstraction of the GUI 1. 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 platf...
Qt 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-onmodules.
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. Enterprise Controlsare commercially sold by The Qt Company.
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 Trolltech) were working together on a database application for ultrasound images written in C++ and running on Mac OS, Unix, and Microsoft Windows.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 Q...
Becoming free software–friendly
With the release of version 2.0 of the toolkit, 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, which guarantees that Qt would fall under a BSD-s...
Acquisition by Nokia
Nokiaacquired Trolltech ASA on 17 June 2008 and changed the name first to Qt Software, then to Qt Development Frameworks. 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. The source code was made available over Gitorious, a community oriented gitsource code repository, with a goal of creating a broader community using and improving Qt. On 14 January 2009,...
4 天前 · ChromeOS. ChromeOS, [8] sometimes styled as chromeOS and formerly styled as Chrome OS, is a Linux distribution developed and designed by Google. It is derived from the open-source ChromiumOS, based on the Linux kernel, and uses the Google Chrome web browser as its principal user interface .
2 天前 · Evolution of Unix systems Unix was originally written in assembly language. [42] Ken Thompson wrote B, mainly based on BCPL, based on his experience in the MULTICS project. B was replaced by C, and Unix, rewritten in C, developed into a large, complex family of inter-related operating systems which have been influential in every modern operating system (see History).
2 天前 · PHP includes various free and open-source libraries in its source distribution or uses them in resulting PHP binary builds. PHP is fundamentally an Internet -aware system with built-in modules for accessing File Transfer Protocol (FTP) servers and many database servers, including PostgreSQL , MySQL , Microsoft SQL Server and SQLite ...
2 天前 · OpenCL (extension of C and C++ to use the GPU and parallel extensions of the CPU) OptimJ (extension of Java with language support for writing optimization models and powerful abstractions for bulk data processing) Perl. Pike. PowerShell. Python (embedded in Maya, Blender, and other 3-D animation packages) Rexx.
