Desenvolvimento/Tutoriais

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Tutoriais são o jeito mais rápido de encontrar o que o KDE pode fazer por você e como conseguir isso. Aqui tem uma lista dos tutoriais disponíveis atualmente para o KDE. Materiais para o KDE3 e KDE2 estãos disponíveis no final desta página.

Fundamentos da Programação KDE 4

Você está interessado em escrever aplicações com o KDE 4? Esta série de tutoriais é voltado para aqueles completamente novos na programação do KDE.

Hello World: Uma introdução ao básico da programação do KDE4
Criando a Janela Principal: Este tutorial mostra a você a mágica de uma das coisas mais importantes de um : A janela principal.
Usando KActions: Como adicionar ações aos menus e as barras de ferramentas. Baseado no tutorial de criação de janelas principais.
Simulação Física: Como realizar uma simulação física: animação e diagrama
Salvar e Abrir: Apresenta a biblioteca KIO ao adicionar suporte à carregamento e salvamento para o nosso aplicativo.
Utilizando bancos de dados SQLite e QtSql: Bases de dados integradas sem a necessidade de um servidor de banco de dados
Argumentos de linha de comando: Adiciona a capacidade de especificar qual arquivo abrir a partir da linha de comando para o nosso editor de texto.
Introdução ao CMake: Como usar o sistema de compilação CMake usado por KDE4.
Erros comuns de programação: Vários erros comuns cometidos durante o desenvolvimento de aplicativos Qt e KDE e como evitá-los.
Depuração de erros de linker: Como entender e depurar erros de linker na hora da compilação.
Usando Qt Creator para desenvolver o seu programa KDE: Como usar Qt Creator como uma IDE para desenvolver programas KDE
Criação de Bibliotecas para compartilhar código: Como adicionar a biblioteca para o sistema de compilação e como preparar o código-fonte.
Gerenciamento de Sessões: Torne o seu aplicativo consciente das sessões X
Ícones: Entregar seu aplicativo com ícones que são automaticamente instalados para os lugares certos. Baseado no Kaction Tutorial.
Arquivo desktop: Deixe seu aplicativo aparecer no menu K e em menus de aplicativo. Com base no Tutorial de Ícones.
Compilando um aplicativo KDE existente

Se você quiser melhorar um aplicativo existente, você pode compilá-lo normalmente e instalá-lo facilmente. Este tutorial mostra como compilar um aplicativo de uma forma que não interfira em seu sistema. Se você não precisa modificar a kdelibs esta pode ser a maneira mais fácil de começar com o desenvolvimento.

Teste e depuração

Depurando seu aplicativo: Dicas, ferramentas e técnicas para aplicar ao depurar o seu aplicativo KDE
Escrevendo UnitTests para Qt4 e KDE4 com QTestLib (Link original): Tutorial por [mailto: [email protected] Brad Hards] que descreve como escrever testes de unidade usando a estrutura QTestLib. É apresentado como um tutorial baseado em exemplo, e ainda está em desenvolvimento.
Formas semi-automáticas para detectar erros de código: Técnicas que você pode usar para detectar erros no código do KDE

Gerenciando configuração de dados com KConfig

Introdução ao KConfig: Uma visão geral das classes do KConfig e como usá-las no código do seu aplicativo
Usando KConfig XT: Tutorial sobre como usar eficientemente o framework KConfig XT.
Atualizando os arquivos do KConfig: Tutorial sobre como escrever um script de atualização para manter as alterações no formato de arquivo de configuração do aplicativo em sincronia com o arquivo de configuração já existente do usuário

Serviços: Aplicativos e Plugins

Introdução ao Framework de Serviços: Uma visão geral do framework de serviços no KDE e o que ele fornece ao desenvolvedor do aplicativo. Cobre o cache de configuração do sistema (SyCoca), os arquivos de dados de origem e para o que a informação indexada pode ser usada.
Encontrar serviços usando Trader Queries: Como encontrar serviços, tais como plugins ou mimetypes, que são indexados em SyCoCa usando Trader Query Syntax

Criando e carregando plugins usando KService

Aprenda a definir os tipos de plugin personalizados, encontrar plugins instalados (incluindo plugins de terceiros) e carregá-los de uma forma fácil e portátil usando KService.

Localização

Veja também o Portal de localização.

Introduction To Unicode: An introduction to what Unicode is as well as how to handle Unicode data in KDE applications.
Writing Applications With Localization In Mind: This tutorial covers what localization is, why it's important and how to ensure your application is ready to be localized. A must read for all application developers.
Avoiding Common Localization Pitfalls: There are several common mistakes that prevent applications from being properly localized. Find out what they are and how to easily avoid them in this tutorial.
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.

Documentation

API Documentation: This tutorial explains how to document your APIs properly.
Man Pages: Writing and Generating Reference Manual Pages.
Source Code: http://quickgit.kde.org; http://websvn.kde.org

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.

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 marhaling 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.
Portar do DCOP para o D-Bus: Port your applications from DCOP to D-Bus with this handy guide.

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.

SuperKaramba

SuperKaramba Tutorial: This tutorial provides an overview of SuperKaramba, theme files and scripting with Python, Ruby and JavaScript.

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.

Search and Metadata

Strigi

Writing file analyzers: File analyzers extract data from files to display in the file dialogs and file managers. The data gathered this way is also used to search for files. KDE4 allows the use of multiple analyzers per file type. This tutorial describes how you can write new analyzers.

Nepomuk

See Nepomuk tutorials.

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

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
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

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

KDevelop-PG-Qt Introduction: Information on the KDevelop parser generator, useful for language plugins.
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.

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.

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.

Other programming languages

Python

An Introduction to PyQt: Starting off
PyQt by Example: Another introduction to PyQt
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

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

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

Gluon

Installation and your first KGLItem: start your first kglengine application
kglpong: Now use our knowledge to make a pong
Play hello word sound: Using Gluon for games sound development using openAL

Using the KDE PIM Libraries

iCalendar functionality: Using kcal to manage iCalendar files

KDE2 and KDE3 Materials

Porting Your Application from KDE 3 to KDE 4: These tutorials cover topics related to the migration from KDE 3 to KDE 4.
KDE3 Tutorials: These tutorials cover topics related to KDE3.
KDE2 Tutorials: These tutorials cover topics related to KDE2.