• Source: KDE Platform 4

      • KDE Platform 4 was a collection of libraries and software frameworks by KDE that served as technological foundation for KDE Software Compilation 4 distributed under the GNU Lesser General Public License (LGPL). KDE Platform 4 was the successor to KDElibs and the predecessor of KDE Frameworks. KDE Platform 4 is the only version of KDE Platform, and in 2013 it was replaced by KDE Frameworks 5.


      Technologies


      User Interface
      Plasma – desktop and panel widget engine
      KHTML – HTML rendering engine
      KIO – extensible network-transparent file access
      KParts – lightweight in-process graphical component framework
      Sonnet – spell checker
      XMLGUI – allows defining UI elements such as menus and toolbars via XML files
      Goya
      Hardware and Multimedia
      Phonon – multimedia framework
      Solid – device integration framework
      Services
      NEPOMUK
      KNewStuff – KDE's "Hot New Stuff" classes
      Policykit-KDE
      Communication
      Akonadi
      Games
      Gluon
      KGGZ
      Other
      ThreadWeaver – library to use multiprocessor systems more effectively
      Kiosk – allows disabling features within KDE to create a more controlled environment
      Kross
      KConfig XT
      WebDAV


      = Technologies superseded in KDE Platform 4

      =
      aRts – sound server (replaced with Phonon)
      DCOP – inter-process communication system (replaced with D-Bus)


      KParts


      KParts is the component framework for the KDE Plasma desktop environment. An individual component is called a KPart. KParts are analogous to Bonobo components in GNOME and ActiveX controls in Microsoft's Component Object Model. Konsole is available as a KPart and is used in applications like Konqueror and Kate.
      Example uses of KParts:

      Konqueror uses the Okular part to display documents
      Konqueror uses the Dragon Player part to play multimedia
      Kontact embeds kdepim applications
      Kate and other editors use the katepart editor component
      Several applications use the Konsole KPart to embed a terminal


      Solid


      Solid is a device integration framework for KDE Platform 4 and its successor, KDE Frameworks. It functions on similar principles to KDE's multimedia pillar Phonon; rather than managing hardware on its own, it makes existing solutions accessible through a single API. The current solution uses udev, NetworkManager and BlueZ (the official Linux Bluetooth stack). However, any and all parts can be replaced without breaking the application, making applications using Solid extremely flexible and portable. Work is underway to build a Solid backend for the Windows port of KDE based on Windows Management Instrumentation.


      References




      External links



      TechBase, documentation for KDE developers
      KDE Projects, overview of all projects within git.kde.org
      KDE quick Git source code browser Archived 2016-11-15 at the Wayback Machine
      KDE Bug Tracking System
      KDE tutorial first program

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