< PlasmaRevision as of 15:19, 25 August 2015 by Sebas (talk | contribs)(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff) The Ultimate Guide to Plasma Development Contents 1 Introduction 1.1 Is this guide for you? 1.2 App, Plasmoid, or both? 2 An app in 5 easy steps 2.1 install and test with plasmoidviewer 3 Requirements Analysis & Design= 4 Software Stack 5 Getting Started 6 Developing a Plasmoid 6.1 Creating the empty package 6.1.1 filesystem structure 6.1.2 metadata.desktop 22.214.171.124 Choosing a Category 6.1.3 installation 6.2 Starting the Code 6.2.1 main.qml stuffz 6.2.2 Plasma API 7 Development Environment Setup 8 Tools 9 Display and Rendering 10 Supporting Multiple Devices 11 Workspace Integration 12 Translations 13 Distribution Introduction This guide explains the basic steps to build a fully integrated application. This guide is targeted at developers with basic knowledge of QML. It guides through the complete process of developing an application from scratch. Plasma allows to write applications that work well on different form factors or devices. Plasma is built to adapt to different input methods (mouse, touch, keyboard, etc.) screen sizes and to be resolution-independent. Most of the information in this guide is applicable to all form factors. Topics that may differ for different form factors are indicated as such. A well-architectured Plasma application will be able to offer different user interface per form factor. For desktops, a landscape layout with quite a lot of space for display and interaction can be used, while the same underlying components in a different, portrait-oriented layout can be used to present the user interface on a phone. A tablet user interface may use either, or combine the components in yet another fashion to make the best use of available screen real estate. In general, Plasma widgets such as buttons and other controls, work well on touch, mouse and with keyboard input, but can be switched at application start or runtime, transparently to the application using it. Is this guide for you? Plasma makes extensive use of QtQuick and QML to write the user interface and business logic of your application. Basic understanding of QtQuick is necessary, though Plasma is also a great environment to learn by doing it. This guide targets developers that are familiar with common programming paradigms, but do not have special knowledge of the Plasma APIs, libraries and mechanisms to solve certain problems. Many things can be implemented without knowing or being able to write C++ code. Plasma provides high-level APIs to solve a great number of tasks and provide common functionality such as retrieving data, displaying information as well as widgets for common interaction patterns and themes and artwork to make your app beautiful and consistent. In some cases, or in more complex apps, you may extend the functionality by writing a C++ plugin (or "import"). This allows to access custom functionality in your system, leverage an existing library, or move logic into a type-safe language that is easier to test (using unit tests, for example) or performs better. App, Plasmoid, or both? - app vs plasmoid An app in 5 easy steps - download template - hack application - metadata.desktop & main.qml install and test with plasmoidviewer kpackagetool5 -i basic kpackagelauncherqml -a org.kde.example.developerguide.basic kpackagetool5 -r basic - kpackagelauncherqml & .desktop file Requirements Analysis & Design= Software Stack - QML / QtQuick: ui primitives, app logic, rendering, states - imports - Plasma libs - underlying frameworks - runtime environment - kpackage Getting Started Developing a Plasmoid Creating the empty package filesystem structure metadata.desktop - system integration (systray, alternatives, mimetypes, arguments, formfactors) Choosing a Category The following are acceptable known entries for plasmoids and applets. If your applet does not fall within one of the following categories, leave the category field empty (it will be automatically categorized under "Miscellaneous" for the time being) and contact the Plasma development team to have a suitable category added to the list (at which point you may then use that category). Accessibility tools that help those with special needs or disabilities use their computer Application Launchers application starters and file openers. Astronomy anything to do with the night sky or other celestial bodies. Date and Time clocks, calendars, scheduling, etc Development Tools tools and utilities to aid software developers Education teaching and educational aides Environment and Weather add-ons that display information regarding the weather or other environmentally related data Examples samples that are not meant for production systems File System anything that operates on files or the file system as it's primary purpose, such as file watchers or directory listings. Simply using a file as storage does not qualify the add-on for this category. Fun and Games for games and amusements Graphics for add-ons where displaying images, photos or graphical eye candy is the primary purpose Language add-ons whose primary purpose is language related, such as dictionaries and translators. Mapping geography and geographic data add-ons Multimedia music and video. Online Services add-ons that provide an interface to online services such as social networking or blogging sites. If there is another more appropriate category for the add-on given the topic (e.g. mapping if the applet's purpose is to show maps), even if the data is retrieved from the Internet prefer that other category over this one. System Information display and interaction with information about the computer such as network activity, hardware health, memory usage, etc Utilities Useful tools like calculators Windows and Tasks managers for application windows and/or tasks, such as taskbars installation - cmake - plasmapkg2 Starting the Code main.qml stuffz - Layouts - plasmoid object - fullRepresentation vs. popup Plasma API + links to API documentation! - PlasmaCore - PlasmaComponents - PlasmaExtras - kdeclarative's useful stuff: kcmOpen? more useful imports - general guidelines: units, iconSizes, Development Environment Setup Tools - editor - commandline - plasmapkg2 - plasmoidviewer - plasmathemething - cuttlefish - Display and Rendering - theming - image display - dpi - ColorScope - Wayland vs. X11 Supporting Multiple Devices - touch friendliness - layout considerations - formfactor support (X-KDE-FormFactors) - touch-specific overrides Workspace Integration - system tray - plasmoid status - dbus autoload Translations - i18n() & friends - making sure i18n is set up & how to x-test Distribution - plasmoid package - appstream metadata - kdeapps online installation - distros - upstreaming code Retrieved from "https://community.kde.org/index.php?title=Plasma/DeveloperGuide&oldid=44020" Content is available under Creative Commons License SA 4.0 unless otherwise noted.