This would be awesome.  I just finished making about 40 frames thinking it could already be done, loaded them into a directory and enabled the slide show only to find that random order was the only option.  Very disappointing.  KDE 3.5 could do this.

*** Bug 337404 has been marked as a duplicate of this bug. ***

*** Bug 299315 has been marked as a duplicate of this bug. ***

I support this idea because I had the same one recently, after reading this article about dynamic wallpapers:

http://technastic.com/macos-mojave-dynamic-wallpaper-on-linux/

I also tried it and had no success because of the randomness of the slideshow setting and thought that having an option to disable randomness would do the trick. So with 16 pictures, I could set change of picture every 1,5 hour, count which one should be used at certain hour (like 3 pm) and then next-skip to the appropriate one and then natural time progress would make it work.

I soon realized, we need more then that. Suspending system suspends also time tracking for wallpaper switcher, so we would also had option to change from independent time to real (computer) time to make this work.

I'm not talking about generally disabling randomness or independent time - current slideshow options is great and works fine. Just those additional options would allow for creation of time depended wallpaper sets. This would be an obscure setting but still a fun thing to do and a good topic for articles on "how to do this on Plasma".

Just a thought ;).

Hopefully someone will think about it some day and add this.
Thanks :)

*** Bug 405774 has been marked as a duplicate of this bug. ***

Oh, I have reported a duplicate bug.
So old this one, reported 10 yeas ago and nobody cares!
I wonder where is the source code, what is the difficulty?
Should be simple...

Here's the code, if you'd like to have a go at it: https://cgit.kde.org/plasma-workspace.git/tree/wallpapers/image/imagepackage/contents/ui/config.qml

Really?

I think the issue is here: https://cgit.kde.org/plasma-workspace.git/tree/wallpapers/image/backgroundlistmodel.cpp#n551

When calling QDir::entryInfoList(), no sort flags are specified. Only filters are set here: https://cgit.kde.org/plasma-workspace.git/tree/wallpapers/image/backgroundlistmodel.cpp#n543

Well, is more, to add options in the UI (probably where you've prompted), manage them etc..

I might be wrong, after all, I'm just a developer seeing the QT for the first time...

Yeah, that sounds about right. Since you're already on the path, would you like to try your hand at producing a patch? You'd be making a lot of people very happy. :)

I'd love to, but I need to learn QT and KDE first, I have no experience with these, except for using KDE on a daily basis. Also, I am totally noob at Linux development (I can get some sources and make so far). And KDE development setup is a completely unknown to me. I can try, sure, probably in a virtual machine? I've no idea what's the right, recomended and preferred Linux flavour for KDE development. Any hints?

This wiki may help:
https://community.kde.org/Get_Involved/development


BackgroundListModel isn't the easiest starting point for KDE, it's needlessly overengineered (in a bad way) old code.

There are two things to sort:
 1) sorting wallpapers within a folder
 2) sorting the folders themselves

The flag you suggest will solve 1. 
2 will remain unsorted, but it is at least deterministic, which might be enough?

Probably some UI choice is necessary (random - as it is now, sorted - by one or more criteria).

(In reply to Mihai Sorin Dobrescu from comment #12)
> Probably some UI choice is necessary (random - as it is now, sorted - by one
> or more criteria).

Yep. Allowing corting by just a single criterion is the simplest and most comprehensible approach, so we would have something like a "Sort order" combobox with the options "Random" "Alphabetical" "Date modified" and whatever else might be useful.

As for your development environment, I actually use a KDE Neon Dev Unstable VM to do my Plasma work and I find that this works very well.

Yes. Even without an option to set the order of chosen images, we can then influence it by renaming the files and in the result, we gain control over what is shown in what order. That would work for me.

For the use case mentioned Michał there could be also the option to sort all images alphabetically in addition to the modes mentioned by David.

Git commit ea32a7611227ca141bd60d983d1489d2be82d10f by David Redondo.
Committed on 25/07/2019 at 10:05.
Pushed by davidre into branch 'master'.

[Image Wallpaper Slideshow] Allow setting of different sorting orders

Summary:
Allows setting of other sorting orders like alphabetical or last modified date.
To enable this a new ProxyModel is introduced which handles the sorting and
filtering (as indicated by the checkboxes). This is backed by the slideshowModel
whcih previously as only used for the configutation. The lists of slides and  unseen
slides are dropped as now the slides that are shown are taken from the model.
FIXED-IN: 5.17.0

Test Plan:
{F6938259}
{F6938260}
{F6938261}
{F6938263}

Reviewers: #plasma, davidedmundson

Reviewed By: #plasma, davidedmundson

Subscribers: davidedmundson, msdobrescu, ngraham, filipf, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D22121

M  +1    -0    wallpapers/image/CMakeLists.txt
M  +1    -1    wallpapers/image/backgroundlistmodel.h
M  +75   -81   wallpapers/image/image.cpp
M  +23   -6    wallpapers/image/image.h
M  +5    -3    wallpapers/image/imagepackage/contents/ui/WallpaperDelegate.qml
M  +52   -2    wallpapers/image/imagepackage/contents/ui/config.qml
M  +8    -2    wallpapers/image/imagepackage/contents/ui/main.qml
A  +90   -0    wallpapers/image/slidefiltermodel.cpp     [License: GPL (v2+)]
A  +50   -0    wallpapers/image/slidefiltermodel.h     [License: GPL (v2+)]
M  +19   -0    wallpapers/image/slidemodel.cpp
M  +22   -0    wallpapers/image/slidemodel.h
M  +4    -1    wallpapers/image/slideshowpackage/contents/config/main.xml

https://commits.kde.org/plasma-workspace/ea32a7611227ca141bd60d983d1489d2be82d10f