As you have seen in the using DataEngines tutorial, Plasma applets can make use of DataEngines to visualize data of many different kinds. In fact, the already available DataEngines offer many options for your applets. But what if you have a specific need, not covered by those?
The problem is easily solved by writing your own Plasma DataEngine, and this tutorial will show you how to create one.
As with applets, DataEngines need the same directory structure (see the Getting Started tutorial), so the first step is to create the appropriate directories. The difference with respect to applets lies in the metadata.desktop file:
Name=Python Date and Time
Comment=Python Time data for Plasmoids
X-KDE-PluginInfo-Author=Simon Edwards X-KDE-PluginInfo-Emailemail@example.com X-KDE-PluginInfo-Name=plasma-dataengine-pytime X-KDE-PluginInfo-Version=1.0 X-KDE-PluginInfo-Website=http://plasma.kde.org/ X-KDE-PluginInfo-Category=Python Date and Time X-KDE-PluginInfo-Depends= X-KDE-PluginInfo-License=LGPL X-KDE-PluginInfo-EnabledByDefault=true
Take a look at the ServiceType line. When using applets, it was "Plasma/Applet", but since now we're dealing with DataEngines, its value is "Plasma/DataEngine".
For this tutorial we'll use the plasma-dataengine-pytime code, which is available on KDE's SVN. This DataEngine is an equivalent to the C++ time DataEngine we connected to in the using DataEngines tutorial. Its function is to display time and date with respect to the current timezone. You can view the main.py file online. As the file is rather long, we'll take a look at it in sections.
from PyQt4.QtCore import * from PyKDE4.kdecore import * from PyKDE4 import plasmascript
def __init__(self,parent,args=None): plasmascript.DataEngine.__init__(self,parent)
def init(self): self.setMinimumPollingInterval(333)
We start with the copyright information, followed by importing the required modules (PyQt4.QtCore and plasmascript). Since we're dealing with time and timezones, we also import kdecore to make use of what KDE offers.
In __init__ we just initialize the class. In init() instead, we set the minimum polling interval, that is the minimum time (in milliseconds) that needs to pass between one data request (from an applet, for example) and another.
sources = ["Local"] sources.extend(KSystemTimeZones.zones().keys()) return sources
def sourceRequestEvent(self, name): return self.updateSourceEvent(name)