Difference between revisions of "Development/Tutorials/Plasma4/PythonRunner"

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== Code ==
== Code ==
The runner is a python class, and additionally you must provide a method for Plasma to create an instance.
<code python>
<code python>

Revision as of 17:45, 12 March 2011

In this example, we're going to be writing a sample KRunner plugin, that will just display the entered text in a messagebox. Then we'll test it and finally package it up for distribution.


First and foremost, make sure you have Python support enabled.

Next, you need to setup your plasmoid's development environment. For this example, our package will be called 'runner_msgbox'. Make a directory to put everything in. Plasma expects a certain set of files and directories to exist when loading a plasmoid package:

  • / - The root of the package
    • metadata.desktop - Metadata about the plasmoid
    • contents/ - The directory plasma looks in for all your resources
      • code/ - 'code' type resources
        • main.py - The plugin's code. You can change this in metadata.desktop.

The metadata.desktop file

First, edit the metadata.desktop file, to look simlar to this:

[Desktop Entry]

Name=Msgbox runner Comment=Sample python krunner plugin, that will show the entered text in a messagebox Type=Service Icon=dialog-information ServiceTypes=Plasma/Runner X-Plasma-API=python X-Plasma-MainScript=code/main.py X-KDE-PluginInfo-Author=<your name> X-KDE-PluginInfo-Email=<your email> X-KDE-PluginInfo-Name=msgbox_runner X-KDE-PluginInfo-Version=0.1 X-KDE-PluginInfo-Website=http://plasma.kde.org/ X-KDE-PluginInfo-License=LGPLv3 X-KDE-PluginInfo-EnabledByDefault=true

The last line is not strictly nessecary, but convenient. Notice the ServiceType, which differs from other Plasma objects.


The runner is a python class, and additionally you must provide a method for Plasma to create an instance.

from PyKDE4 import plasmascript

from PyKDE4.plasma import Plasma from PyKDE4.kdeui import KIcon, KMessageBox

class MsgBoxRunner(plasmascript.Runner):
   def match(self, context):
       if not context.isValid():
       q = context.query()
       if q.length < 2:
       m = Plasma.QueryMatch(self.runner)
       m.setText("Message: '%s'" % q)
       context.addMatch(q, m)
   def run(self, context, match):
       KMessageBox.messageBox(None, KMessageBox.Information, match.data().toString())

def CreateRunner(parent):

   return MsgBoxRunner(parent)

It is as simple as that. Note that the CreateRunner function must be present, and return an instance of your runner class.

This code is about minimal. Plasmascript. Runner is a Plasma.AbstractRunner

Test the plugin

Now you should be ready to test the plugin, to install it, simply run

$ plasmapkg --type runner --install <directory>

Now press ALT + F2 and type 'something', and you should see the command "Message 'something' in the match list, and if you run it, a messagebox should show, telling you "something"

I have learned that krunner should be restarted between updates, so if you change your script and reinstall it, restart krunner:

$ plasmapkg --type runner --upgrade <directory>
$ kquitapp krunner
$ # wait a moment
$ krunner

Distributing the plugin

Should you want to distribute your plugin, it is practical to pack it in a zip file that users can download:

$ zip <directory>

The zip archive can be installed with plasmapkg, just as the directory:

$ plasmapkg -t runner -i mypackage.zip

That's all, happy coding :-)

Content is available under Creative Commons License SA 4.0 unless otherwise noted.