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KDE Frameworks
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The [https://kde.org/products/frameworks/ KDE Frameworks] (in short KF5), are a collection of 82 libraries that are built on top of [https://www.qt.io Qt] and provide everything from simple utility classes, additional data models and widgets to asynchronous and network-transparent I/O. If Qt itself doesn't provide a certain functionality or feature, chances are, there's a KDE Framework for that.
Translations:KDE Frameworks/1/haw
The [https://kde.org/products/frameworks/ KDE Frameworks] (in short KF5), are a collection of 82 libraries that are built on top of [https://www.qt.io Qt] and provide everything from simple utility classes, additional data models and widgets to asynchronous and network-transparent I/O. If Qt itself doesn't provide a certain functionality or feature, chances are, there's a KDE Framework for that.
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While KF5 does serve as the basic building blocks of KDE software, they can be used by any Qt application just like any third-party Qt add-on library. Like any other KDE software, KF5 uses
CMake as a build system, but using them with QMake is possibe, too. Many frameworks are available on multiple operating systems such as Linux, Windows, macOS and Android. Be sure to check each framework's documentation for their supported platforms.
All KDE Frameworks follow strict [https://community.kde.org/Frameworks/Policies quality standards] and offer source and binary compatibility.
Most KDE Frameworks are licensed under LGPL, while a few are BSD/MIT licensed. This makes them usable for about any type of software.
{{Info|The current version of '''KDE Frameworks is 5.70.0'''. Please see the [https://kde.org/announcements/kde-frameworks-5.70.0.php release announcement] for more information.}}
Each of the KDE Frameworks has a Tier and a Type, as you will see in the [https://api.kde.org/frameworks/index.html API documentation]. While not critical to using the frameworks, this organization can help developers in determining the frameworks' dependencies.
* Tier 2 Frameworks can depend only on Tier 1 Frameworks, Qt official frameworks, or other system libraries;
* Tier 3 Frameworks can depend only on other Tier 3 Frameworks, Tier 2 Frameworks, Tier 1 Frameworks, Qt official frameworks, or other system libraries.
* Functional Frameworks cannot have runtime dependencies. KArchive, for example, can be used as-is as a drop-in library.
* Integration Frameworks can have optional runtime dependencies and aim at integrating with the underlying OS/Platform. Solid needs other runtime components to deliver hardware information on different platforms.
* Solutions have mandatory runtime dependencies to function. KIO, the KDE I/O framework, requires certain daemons to offer a network-transparent virtual filesystem.
How easy is it to use KDE Frameworks 5? Just as easy as using any Qt widget or adding any C++ library to your project. You don't even have to switch away from QMake if that's your cup of tea. Here's one very quick and dirty example of how simple it is to use a framework.
{{Note|The example below is written just for demonstration purposes and does not reflect proper coding practices or conventions. For more in-depth examples, please check our [[Development/Tutorials|Tutorials]] section.}}
For this example, we'll be using the [https://api.kde.org/frameworks/kwidgetsaddons/html/classKDatePicker.html KDatePicker widget] from the KWidgetsAddons framework. On KDE Neon/Ubuntu/Debian, it's as simple as:
Adjust according to your Linux distro's packaging system, of course. If you want the latest version of the framework and it isn't available from your distro, you will have to get it from the source (Git or tarball) and build it yourself. Check out the KDE Community's handy guide to [https://community.kde.org/Guidelines_and_HOWTOs/Build_from_source building KDE software from source].
Add the Framework's name, properly capitalized, in your QMake project file just like you would any other Qt module.
If you're already using CMake as your build system of choice, you'll want to also grab the Extra CMake Modules made by the KDE community to provide modules and macros to make finding and linking to Frameworks so much easier.
KDatePicker, like many other widgets from KDE Frameworks, behave just like any Qt widget. As such, you can simply slot them in or use them in Qt projects with no problem at all. Here is a contrived example where selecting a date from the calendar widget displays its string representation on the label beside it.
Just build the project as normal and that's it! Welcome to the wonderful world of KDE-powered software!
Now that you've seen how easy it is to add KDE Frameworks into your software, here's an appetizer of the various frameworks available and what they can do for you.
* Like KDatePicker above, [https://api.kde.org/frameworks/kwidgetsaddons/html/index.html KWidgetsAddons] offers a wide variety of add-on widgets that go beyond what Qt itself offers. On the other hand, [https://api.kde.org/frameworks/kcoreaddons/html/annotated.html KCoreAddons] includes non-graphical utility classes that help manage children processes, create autosave files, and create factory-style plugins.
* [https://api.kde.org/frameworks/sonnet/html/index.html Sonnet] adds multi-language spellchecking to any QTextEdit (really QTextDocument) object with support for different spelling backends while [https://api.kde.org/frameworks/syntax-highlighting/html/index.html KSyntaxHighighting] extends Qt's syntax highlighting support with a standardized and expandable syntax definition format.
* [https://api.kde.org/frameworks/threadweaver/html/index.html ThreadWeaver] takes the pain out of one of the most difficult aspects of modern application development: multi-threaded programming.
* [https://api.kde.org/frameworks/kconfig/html/index.html KConfig] lets you have a configuration system that works across platforms, no matter the actual back-end file format. [https://api.kde.org/frameworks/kpackage/html/index.html KPackage], on the other hand, can help you extend your programs with content that is installed like plugins.
* If you need to embed an advanced text editor but don't want to go through the hassle of writing one yourself, [https://api.kde.org/frameworks/ktexteditor/html/index.html KTextEditor] offers all the functionality you need either as a library or an embeddable KPart.
* [https://api.kde.org/frameworks/kirigami/html/index.html Kirigami] is like a framework inside a framework, providing a rich set of Qt Quick components for developing a new breed of applications that bridge the divide between screen sizes and form factors.
* And, of course, there's the [https://api.kde.org/frameworks/plasma-framework/html/index.html Plasma framework] that serves as the foundation for KDE's Plasma workspaces, both for desktops as well as mobile, giving developers the building blocks for creating primary user interfaces as well as applets (widgets) to run on those workspaces.
Be sure to check the [https://api.kde.org/frameworks/index.html full collection of 80 KDE Frameworks] on the API documentation website along with [https://api.kde.org/index.html other KDE libraries] you can use to develop the next killer app, be it on Linux or Windows, desktop or mobile, and anything else in between.
* [https://community.kde.org/Guidelines_and_HOWTOs/Build_from_source How to Build KDE Software from Source]
* [https://community.kde.org/Get_Involved/development How to get involved with the KDE Community]
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