Sviluppo/Guide

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Here is a list of currently available tutorials for developing KDE Applications or KDE Plasma, or using KDE Frameworks to develop a 3rd-party application.

Basics of how to develop with KDE Frameworks

Are you interested in writing applications with KDE Frameworks? This tutorial series is aimed at those completely new to it.

Setting Up: Before you start writing and building KDE software, you'll need to prepare your tools first.
Ciao mondo: An introduction to the very basics of KDE Frameworks programming
Creare la finestra principale: Questa guida mostra la magia dell'elemento più importante di un'applicazione: la finestra principale.
Using Actions: Come aggiungere le azioni ai menu e alle barre degli strumenti. Basata sulla guida Finestra principale.
Salvataggio e caricamento: Introduce la libreria KIO spiegando l'aggiunta del supporto al caricamento e al salvataggio nell'applicazione.
Argomenti della riga di comando: Aggiungere la possibilità di specificare dalla riga di comando quale file aprire nel nostro editor di testo.
Errori comuni di programmazione: Vari errori comuni commessi sviluppando applicazioni Qt e KDE e come evitarli.

Integrating with Workspaces

Gestione della sessione: Rendere l'applicazione consapevole delle sessioni di X.
Icone: Distribuire l'applicazione con le icone automaticamente installate al posto giusto. Basata sulla guida Kaction.
File Desktop: Let your application show up in the K menu and in application menus. Based on the Icons Tutorial.

Gestire i dati della configurazione con KConfig

Introduzione a KConfig: Una panoramica delle classi KConfig e su come utilizzarle nel codice della tua applicazione.
Utilizzare KConfig XT: Guida su come utilizzare in modo efficiente l'infrastruttura KConfig XT.
Aggiornare i file KConfig: Guida su come scrivere uno script di aggiornamento per mantenere le modifiche del formato del file di configurazione della tua applicazione sincronizzate con il file di configurazione già esistente dell'utente.

Services : Applications and Plugins

Introduzione all'infrastruttura dei servizi: Una panoramica dell'infrastruttura dei servizi in KDE e di quanto viene offerto allo sviluppatore di applicazioni. Tratta la cache della configurazione del sistema (SyCoCa), i file di dati del sorgente e gli utilizzi possibili delle informazioni indicizzate.
Trovare i servizi utilizzando le interrogazioni Trader: Come trovare i servizi, come plugin o tipi di file, che sono indicizzati in SyCoCa utilizzando la sintassi delle interrogazioni di Trader.
Creating and Loading Plugins Using KService: Learn how to define custom plugin types, find installed plugins (including 3rd party plugins) and load them in an easy and portable fashion using KService.

Localizzazione

Vedi anche il portale Localizzazione.

Introduction To Unicode: An introduction to what Unicode is as well as how to handle Unicode data in KDE applications.
Scrivere le applicazioni tenendo conto della localizzazione: Questa guida spiega la localizzazione, la sua importanza e come assicurarsi che l'applicazione sia pronta per essere tradotta. Una guida assolutamente da leggere per tutti gli sviluppatori.
Evitare gli errori comuni della localizzazione: Ci sono numerosi errori comuni che impediscono di localizzare in modo adeguato le applicazioni. Scopri quali sono e come evitarli facilmente grazie a questa guida.
Building KDE's Localization Module: Building and installing language support from KDE's localization (l10n) module is a good idea for those working on applications in the main KDE repository. Doing so will allow you to test your application in another language and spot problem areas. Learn how to do just that in this tutorial.
Incorporating i18n Into the Build System: Once your application is ready to be localized, the next step is to ensure that translation files are built automatically and kept up to date. This tutorial covers the necessary CMakeFiles.txt additions as well the process of distributing the resulting message catalogs with your application.
Common i18n Challenges and Solutions: This tutorial covers challenges that you may eventually run into such as translating handbooks and other data that exists outside of the source code, merging and handling obsolete .po files, dealing with freezes, coding in languages other than English and creating independent releases of or moving applications between KDE modules.
Semantic Markup of Messages: To ensure consistent presentation and more meaningful representations of messages in applications, semantic markup can be applied to messages marked for translation using the KUIT system. This tutorial describes how this system works.
Automated i18n Code Checking: The Krazy code checker scans KDE's code and reports common i18n mistakes.
Dealing with Language Changes: This tutorial covers dealing with changing languages: How to add the function to change the language and then dynamically update the user interface when language has been changed.
Understanding How Messages Appear to Translators: An introduction to what context information is extracted (and what isn't) from source code for translators to see.

Application Automation and Scripting

D-Bus

Introduction to D-Bus: A straight-forward introduction to the core concepts in D-Bus from an application developer's perspective, this tutorial covers what D-Bus is and how it can be used by applications.
Accessing D-Bus Interfaces: A step-by-step guide to calling D-Bus methods and connecting to D-Bus signals using QtDBus.
Intermediate D-Bus: Tips to make use of QtDBus when faced with problematic real-world interfaces.
Creating D-Bus Interfaces: Learn how to expose functionality in your application by creating and using custom D-Bus interfaces. Covers generating the XML descriptions, instantiating interfaces at run time and setting up the build system with CMake.
Using Custom Types with D-Bus: Learn how to use your own types in classes exported on D-Bus. Covers marshaling and unmarshaling of objects, the integration of custom types into XML descriptions and registering the custom types with the Qt Meta Object system.
D-Bus Autostart Services: Turn your application into a D-Bus autostart service with this tutorial. This D-Bus feature, also known as "D-Bus service activation", will ensure that even when your application isn't running that D-Bus calls made to it will work by relying on the D-Bus daemon itself to start your app if and when needed.

Konqueror

Creating Konqueror Service Menus: This tutorial shows you how to create mimetype-specific actions in Konqueror's context menu (aka "servicemenus").

Kross

Introduction to Kross: An introduction to the Kross Scripting Framework.
Hello World: A first application with working kross code.
Calling Functions in Kross: Simple demonstration of calling scripting functions
Connecting Signals and Slots in Kross: Simple demonstration of connecting object signals with script slots
Scripts as Plugins with Kross: This tutorial provides a step-by-step introduction how to integrate scripts as plugins into a KDE application.
Placing script actions in your application menus: Simple demonstration on how to extend you application menus to execute script files.
How to use an ActionCollection: A small Tutorial on How to use Kross::ActionCollections.

Calligra Plugin Tutorials

Calligra Overview

This document shows an overview of the different Calligra plugin types and tells you what each of their purpose and strengths are. If you are new with Calligra plugins, this is the place to start.

Calligra Plugin Creation

This gives a technical overview of what it means to write a Calligra plugin.

Creating Calligra Flake Plugins

This tutorial shows you how you can build a plugin for Calligra applications to allow you embed content in ODF documents using Flake.

Calligra Words Scripting

This tutorial shows how to script Calligra Words with Python, or JavaScript using Kross.

Calligra Sheets Scripting

This tutorial shows how to script Calligra Sheets with Python, or JavaScript using Kross.

System Activity

Writing script actions for the process's context menu: This tutorial shows how to add a context menu action to show custom information about a process.

KWin

KWin Scripting Tutorial: This tutorial shows how to write a useful script for KWin.

QML Window Switcher Layouts: This tutorial documents the new QML layouts for the KWin Window Switcher

Plugins and KParts

Using KParts: A kPart is a plugin that you can just load into your application. For example, it is easy to integrate an editor (the katePart) or a console (the konsolePart) into your application's window.
Writing kontact plugins: Kontact plugins are KParts. This tutorial describes how you can write one.
Writing Qt Designer Plugins: Add your widgets to Qt Designer and thus make them usable in UI files.
KCM HowTo: KCM are plugins which are loaded by System Settings to display configuration elements. They can also be used within an application.

Hardware Awareness (Solid)

Introduction to Solid: An introduction to the Solid effort in general and it library in particular.
Listing Devices: How to use the Solid core library to discover the hardware and interact with the system.
Accessing Network Information: How to use the Solid system to get information about the network
Creating a Device Action: When your application is interested in registering actions with the system for removable hardware

Authorization and Privilege escalation (KAuth)

KAuth Basics: An overview of concepts and basic knowledge required to understand and use KAuth effectively
Using KAuth actions in your application: How to execute KAuth actions in your application, and how to integrate them tightly into your UI
Creating a KAuth helper to perform a privileged action: You will learn how to use KAuth's helpers and escalation facilities, and how to seamlessly make a privileged and non privileged portion of your application interact
Creating a KCM requiring authorization upon saving: Learn how to use the high level KCModule API to create KCModules handling authorization, and its UI integration, on their own

Multimedia (Phonon)

Phonon: Introduction to Phonon tells how to compile and run the code. If you like to work in Python, try this version of the same tutorial
Writing Backends: How to start creating a new backend for the multimedia API
Resources: Please have a look at the online documentation for information on the Phonon API. If you prefer using Qt Assistant or Qt Creator you can also use our offline documentation.

Plasma 5

See Plasma tutorials.

Personal Information Management (Akonadi)

Using Akonadi in Applications: Displaying and modifying data provided by Akonadi
Developing Akonadi Resources: Akonadi Resources are agent programs which transport PIM data between Akonadi and a backend (files, servers, etc)
Using custom data types with Akonadi: Akonadi can handle arbitrary data as item payloads through the use of a plugin based serialization framework

Kate / KWrite

Getting started with KTextEditor plugins: Creating your first KTextEditor plugin
Developing a plugin with configuration dialog: Adding a configuration dialog to the Time & Date example
A small Editor: Create a small application using KTextEditor

KDevelop

Creating a class template: Instructions for creating a class template, which can be used to quickly generate classes from KDevelop.
Creating a project template: Instructions for creating a project template, which can be used for starting new project with KDevelop.
KDevelop-PG-Qt Introduction: Information on the KDevelop parser generator, useful for language plugins.

Printing

KDE mostly uses the Qt Printing infrastructure.

Hello World: Introduction to the KDE printing system

kioslaves

Collaboration

Open Collaboration Services (libattica)

Introduction to Attica: In this tutorial a simple widget showing information about a Person on the server is created.

Get Hot New Stuff

Get Hot New Stuff 3 - Download: How to use KHotNewStuff3 in your application.
Get Hot New Stuff 3 - Checking for Updates: How to check whether updates for installed stuff are available without showing the dialog/widget.
Get Hot New Stuff 3 - Upload: How to add an upload dialog to your application.

Other programming languages

Python (PyQt4)

Note

The tutorials below apply to an older version of Qt only. While there are stable Python bindings available for Qt 5, bindings for KDE Frameworks 5 are still under development.

An Introduction to PyQt: Starting off with an introduction to PyQt4
Using PyKDE4: Introduction to PyKDE4
PyKDE WebKit Tutorial: A simple web browser application in PyKDE
101 Introduction to signals and slots: A simple introduction to Qt's signal and slot architecture.
PyKDE DBus Tutorial: An introduction to DBus communication using PyKDE
PyKDE KNotify Tutorial: An introduction to Knotify (Notifications and KJobs) using PyKDE

Ruby

Note

The tutorials below apply to an older version of Qt only. There are currently no Ruby bindings for Qt 5 and KDE Frameworks 5 available.

KDE Ruby Korundum tutorial: A ruby version of Antonio Larrosa Jiménez's KDE tutorial by Richard Dale. See the Ruby Developers Corner for Qt tutorials and other info.
Qt4 Ruby Tutorial: Nokia's fabulous introductory tutorial to Qt, translated to Ruby.
Creating a Plasma Widget in Ruby: Tutorial that shows how to create your first Plasma Applet using the Ruby language.
Developing Qt4 Applications using Qt Designer and Ruby on Kubuntu: Tutorial that shows how to design a simple User Interface in Qt Designer and then use the resulting widget in a Qt Ruby application we build from scratch.
Ruby-Qt/KDE Book: There is also an approach to create an Ruby-Qt/KDE Book under a free license. The content will be created in this wiki.

Shell

Shell Scripting with KDE dialogs (Original Link): Tutorial by Brad Hards that describes how to use KDE dialogs in shell scripts with kdialog. It is presented as an example based tutorial.

Graphics Programming

QPainter Perfomance: Hints on avoiding common mistakes leading to poor performance when using QPainter

HiDPI Support: How to render sharp GUI for HiDPI display

Using the KDE Games Libraries

KStandardGameAction: Using libkdegames to make your game fit the kdegames standard
Highscores: Implementing a simple highscore table into your game
Theme Selector: Using the libkdegames theme selection dialog
Palapeli Slicers: Creating a slicer plugin for Palapeli

Deprecated Material

Warning

Tutorials in this section are outdated and are no longer relevant to the current state of KDE software. They are being retained here for historical purposes only. Please do not use them.

Accessibility

Accessibility Overview: A list of accessibility tutorials and general information.
Accessibility Checklist: What to look for in your application to make it accessible for as many people as possible.
Screen Reader: This tutorial will explain some details about using screen readers with KDE applications.
Text-To-Speech: How to utilize Jovie text-to-speech service in your application.

D-Bus

Porting from DCOP to D-Bus: Port your applications from DCOP to D-Bus with this handy guide.

Personal Information Management (Akonadi)

Porting Applications which use KResource API: Applications using KDE's now deprecated KResource APIs, e.g. KABC or KCal, need to be ported to use their Akonadi equivalents

Get Hot New Stuff

Old links for KNS2 and KNS1 content:

Introduction to Get Hot New Stuff 2: A short tutorial about how to use KHotNewStuff2 in your application. Deprecated, use version 3
Introduction to Get Hot New Stuff: An introduction to the developer-friendly network update system that allows KDE applications to fetch new application data at runtime in a user friendly manner.
KNewStuff Secure (Original Link): Tutorial showing how to share resources in a secured way (KDE 3.4 and later). By András Mantia <[email protected]>.

Goya

Introduction to Goya usage: An introduction for the Goya subsystem usage, which allows you to easily add widgets to your itemviews and connect their signals to your code, as they were real widgets.
Introduction to Goya usage (part 2): The second part of the tutorial, with a slightly more complex example than the first part.

Using the KDE PIM Libraries

iCalendar functionality: Using kcal to manage iCalendar files

Pixmap cache (KPixmapCache)

Using the KDE pixmap cache: This tutorial shows how to use KPixmapCache to cache e.g. pixmaps generated from SVGs or some data.

Porting an application from KSystemTrayIcon to KStatusNotifierItem

Porting from KSystemTrayIcon to KStatusNotifierItem: This tutorials shows how to port an application using KSystemTrayIcon to KStatusNotifierItem

How to edit a wiki with Libmediawiki

Libmediawiki: This tutorial present how to edit a wiki with Libmediawiki.

KDE2 and KDE3 Materials

KDE3 Tutorials: These tutorials cover topics related to KDE3.
KDE2 Tutorials: These tutorials cover topics related to KDE2.

Basics of how to develop with KDE Frameworks

Integrating with Workspaces

Gestire i dati della configurazione con KConfig

Services : Applications and Plugins

Localizzazione

Application Automation and Scripting

D-Bus

Konqueror

Kross

Calligra Plugin Tutorials

System Activity

KWin

Plugins and KParts

Hardware Awareness (Solid)

Authorization and Privilege escalation (KAuth)

Multimedia (Phonon)

Plasma 5

Personal Information Management (Akonadi)

Kate / KWrite

KDevelop

Printing

kioslaves

Collaboration

Open Collaboration Services (libattica)

Get Hot New Stuff

Other programming languages

Python (PyQt4)

Ruby

Shell

Graphics Programming

Using the KDE Games Libraries

Other tutorials

2D Plotting (KPlotWidget)

Spelling and Grammar Checking (Sonnet)

Using the KDE Wallet API for safe storage

Deprecated Material

Accessibility

D-Bus

Personal Information Management (Akonadi)

Get Hot New Stuff

Goya

Using the KDE PIM Libraries

Pixmap cache (KPixmapCache)

Porting an application from KSystemTrayIcon to KStatusNotifierItem

How to edit a wiki with Libmediawiki

KDE2 and KDE3 Materials