DataEngines and Services provide access to various types of data and the ability to interact with them via asynchronous services with a convenient and consistent API. See the JavaScript Plasmoid DataEngine tutorials for examples on how to use DataEngines and Services in your Plasmoids.

Global Functions to Access DataEngines and Services

dataEngine(string name): returns a DataEngine object
service(string dataEngineName, string sourceName): returns a ServiceObject, see also DataEngine::serviceForSource

DataEngine

Read-only properties:

Array[String] sources
boolean valid
String icon
String name

Signals:

sourceAdded(String sourceName)
sourceRemoved(String sourceName)

Functions:

serviceForSource(String sourceName)
connectSource(String sourceName, Object connectTo[, number interval[, IntervalAlignment alignment] ]): if the object passed in as the object to connect to is the plasmoid object, then the plasmoid.dataUpdated(String source, Map[String, Any] data) callback will be called if it exists
connectAllSources(Object connectTo[, number interval[, IntervalAlignment alignment] ]): if the object passed in as the object to connect to is the plasmoid object, then the plasmoid.dataUpdated(String source, Map[String, Any] data) callback will be called if it exists
disconnectSource(String sourceName, Object connectedTo): if the object passed in as the object to connect to is the plasmoid object, then the plasmoid.dataUpdated(String source, Map[String, Any] data) callback will be called if it exists
Data query(String sourceName)

The following functions are only of interest to DataEngine reimplementations (e.g. JavaScript DataEngines):

scheduleSourcesUpdated()
removeSource(String)
updateAllSources()
forceImmediateUpdateOfAllVisualizations()
DataContainer containerForSource(String)

Service

function finished(Plasma::ServiceJob*)
function operationsChanged()
function serviceReady(Plasma::Service*)
function setDestination(QString)
function destination()
function operationNames()
function operationDescription(QString)
function startOperationCall(KConfigGroup,QObject*)
function startOperationCall(KConfigGroup)
function isOperationEnabled(QString)
function name()
function associateWidget(QWidget*,QString)
function disassociateWidget(QWidget*)
function associateWidget(QGraphicsWidget*,QString)
function disassociateWidget(QGraphicsWidget*)
function parametersFromDescription(KConfigGroup)