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You can contribute to KDE with non-C++ code
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this post was submitted on 23 Jul 2024
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I remember trying to write a python script to control windows on KDE and could for the life of me not find the libraries, let alone APIs to call.
It's quite simple: when watching tournaments and other events that have multiple streams/stages, I have multiple windows streaming the content and different layouts.
I would like to be able to:
It's not many API calls, but in python, without going down all the way to some X11 library, I haven't found a way to do it using KDE libraries.
There are other usecases for example switching between audio sinks with key strokes, updating window positions depending on which window has been opened and which activity is active, and a bunch of other stuff. Unless I write C++, or know where to find the library, or know how to bind to C++, or want to take the time to bind to C++ with FFI, I'm SOL.
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I’ve had good luck interfacing with KDE windows using dbus in python, although if I remember right the more granular control also required javascript (still passed thru dbus with python). The only python library I needed was Qt (for their dbus implementation because I was already using their event loop, but any other lightweight dbus package should work fine).
Is there documentation on the dbus interfaces that's easily searchable? For example, I can't find out something as simple as listing all the windows or even setting a window property.
org.kde.KWindoesn't seem to have it, nor doesorg.kde.plasmashell. Nor do I know what value to pass when it's a "QString` but clearly an enum.Anti Commercial-AI license
I remember being able to figure out a solution with the kwin docs and dfeet for introspection, but it was a while ago and my memory is less than stellar lol. I ended up running all my window-related logic in the kwin script (js) and just using python+dbus to see if the script had been injected and do it if not. If you go the same route (though the python is unnecessary this way if you aren’t using it for something else, like running one of the windows you wanna manipulate) the
workspaceglobal variable stores all windows instackingOrder, so looping through that list (for (window of workspace.stackingOrder) {…}) is an easy way to check each window. I definitely remember docs on the workspace/windows part, but tbh I think I just introspected with the jsconsole.logand the log kwin prints it to (journalctl maybe?). Sorry I don’t remember more about the process, I got into the kwin scripting for all of an hour cuz of the Wayland regression of not being able to control your own window’s size/position in qt so it was a bit of a hack fix I haven’t had to think about since.