Signed-off-by: Juraj Oravec <jurajoravec@mailo.com>

2022-03-18 22:39:39 +01:00

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Falkon Python Tutorial - 2. Basic extension

File structure

Each extension has to contain:

metadata.desktop
_init_.py

Anything else depend on the creator.

metadata.desktop

This file contain information which are displayed in Falkon settings and some configuration.

Example file

[Desktop Entry]
Name=Example Python
Comment=Example Python extension
Icon=
Type=Service
X-Falkon-Type=Extension/Python

X-Falkon-Author=David Rosca
X-Falkon-Email=nowrep@gmail.com
X-Falkon-Version=0.1.0
X-Falkon-Settings=false

Name

Extension name shown in Falkon settings.

Comment

Extension description shown in Falkon settings.

Icon

Extension Icon shown in Falkon settings.
Path to icon file or icon name from icon theme.

Type

Keep: Service
I did not find a use of this field in code yet (maybe legacy ?).

X-Falkon-Type

Falkon Extension type.
For Python extension use: Extension/Python

X-Falkon-Author

Author`s name shown in Falkon settings.

X-Falkon-Email

Author`s email shown in Falkon settings.

X-Falkon-Version

Extension version shown in Falkon settings.

X-Falkon-Settings

If extension has a setting dialog.
Extension Settings button in Falkon preferences depends on this variable.
Possible values: true or false

_init_.py

Entry point to our program.
This file will be called when extension is loaded.
Some people consider leaving this file almost empty with only license and import line.
I will leave the decision up to you.

Example extension

This code is from example extension from store.falkon.org.

import Falkon
from PySide2 import QtCore

class ExamplePython(Falkon.PluginInterface, QtCore.QObject):
    def init(self, state, settingsPath):
        print("Example Python")
        print("{} {}".format(state, settingsPath))

    def unload(self):
        print("unload")

    def testPlugin(self):
        return True

Falkon.registerPlugin(ExamplePython())

The plugin / extension class inherits from Falkon.PluginInterface1 and QtCore.QObject.
The plugin class has to be registered with Falkon.registerPlugin().

Methods used

init()

Called when extension is loaded.

state: possible values
- PyFalkon.PluginInterface.InitState.StartupInitState
  Normal init state during Falkon start, nothing to do for us.
- Falkon.PluginInterface.LateInitState
  The extension was loaded long after Falkon started.
  In this case we need to manually call functions which would normally be called during the start.
  The exact case will be shown in one of the next chapters.
settingsPath: Contains path to extension setting directory

unload()

Called when the plugin is uloading by being disabled in settings or when Falkon is closing.

testPlugin()

Method to check if plugin is compatible with current Falkon version.
Return True if is and False if not.

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