How to set wallpaper background color in command line?

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1

Although it is possible to set the wallpaper through the command line I was unable to find an option for the background

usr_40476@localhost:~> plasma-apply-wallpaperimage --help
Usage: plasma-apply-wallpaperimage [options] imagefile
This tool allows you to set an image as the wallpaper for the Plasma session.

Options:
  -h, --help  Displays help on commandline options.
  --help-all  Displays help including Qt specific options.

Arguments:
  imagefile   An image file or an installed wallpaper kpackage that you wish to
              set as the wallpaper for your Plasma session
usr_40476@localhost:~>
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2

I’m pretty sure this isn’t implemented yet.

3

hmmm, I’m going to do something a have never done before, contribute. (where is the repo? – or am i understanding this wrong?)

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4

That’s great!

The code for the plasma-apply-wallpaperimage binary lives at wallpapers/image · master · Plasma / Plasma Workspace · GitLab. Based on the name of the binary, you can tell it’s intended only for applying images.

So my recommendation would be to clone it and create a new plasma-apply-wallpapercolor tool that lives at wallpapers/color · master · Plasma / Plasma Workspace · GitLab.

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5

hmmm, I see, but where is the code for changing the background color that the gui uses?

6

also i’m afraid I may have broken the sign up process and seem to have borked my email as I cannot get my password reset to work with either of my emails

7

If you need help logging in, you can always email sysadmin@kde.org to explain the situation. They’ll help you out.

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8

Thank you, I just did that,
Please can you point me towards where is the code for changing the background color that the gui uses?

9

It’s in here:

The code is declarative rather than imperative, so if you’re looking for something that says

if (wallpapercolor) {
    applyWallpaperColorToDesktop();
    return 0;
}

Then that would be why you aren’t finding it. :slight_smile:

What the code in that file is doing is instantiating a WallpaperItem object, which is the base class for wallpaper subclasses. Then that object is completely filled with a Rectangle whose color comes from the value of root.configuration.Color, which is set by the user in wallpapers/color/contents/ui/config.qml · master · Plasma / Plasma Workspace · GitLab. This colored rectangle is then used as he wallpaper.

So your command-line program will need to set the value of the Color configuration string.

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10

I have to add the method to change wallpaper changed between Plasma 5 and plasma 6.
wallpapers/image/plasma-apply-wallpaperimage.cpp · master · Plasma / Plasma Workspace · GitLab has not been updated yet.
In Plasma 6 (which you should target), you can pass any wallpaper setting using dbus, this should make your implementation simpler.
You can see an example at shell/tests/setwallpapertest.cpp · master · Plasma / Plasma Workspace · GitLab
Pass org.kde.color and pass your color settings in the params QVariantMap.

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11

I think i forgot to mention that this is my first time with C or C++, so I may have walked into a bit of a situation, but I am determined to make it a learning opportunity, could some guide me though the proccess?
I have programming knowled in javascript and that is about it but I wanted to be better at the skills that I would need to work on/add features I was curious about