Bug 164955

Summary:	Create a way to use qt style sheets (qss) for theming/styles
Product:	[Unmaintained] kdelibs	Reporter:	Iuri Fiedoruk <protomank>
Component:	kstyle	Assignee:	Maksim Orlovich <maksim>
Status:	RESOLVED INTENTIONAL
Severity:	wishlist	CC:	acidrums4+stuff, cfeck, sammonius_s
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Iuri Fiedoruk 2008-06-25 20:01:24 UTC

Version:            (using KDE 4.0.83)
Installed from:    Ubuntu Packages

Qt 4.2 introduced a new way for theming apps: using a style sheet file (qss) much like css for html: http://doc.trolltech.com/4.3/stylesheet-examples.html

Using this is much easier to create themes than coding a style in C++, and a much broader quantity of people will be able to create themes.

You can already run an application with --stylesheet (file.qss) option and it will theme it using the style sheet, but it does have some issues:
- the qss does not work in some parts because of the current style used in kde overrides it
- you can't set it globally to all launched kde apps without adding the --stylesheet command line option.

So, my wish is that and option in systemsettings->look&feel->style is added in witch user can pick a qss file to theme KDE apps and that kde reverts to some basic theme that does not interfere with the qss.

I do not think it's too hard to implement, but if any developer like the idea but does not have time to implement, I gladly would give a try if you provide me with directions :)

Comment 1 Maksim Orlovich 2008-06-26 00:54:21 UTC

Sorry, I wouldn't support features that are technically broken, no matter how cool.

Comment 2 Iuri Fiedoruk 2008-06-26 02:14:01 UTC

Could you please elaborate?
I'm not complaining about the WONTFIX, but rather I'm curious about the reason.
Thanks anyway.

Comment 3 Maksim Orlovich 2008-06-26 02:19:13 UTC

Essentially, the style API is woefully under-documented, and it's not clear what -exactly- things should be doing. There are no statements of invariants or anything like that. And the CSS stuff puts in an extra style proxy which intercepts some stuff from the native one, but not other stuff. However, there is nothing to guarantee that the rest will keep working. Essentially, I have no way of convincing myself that the system of the CSS proxy style + native style is doing anything sane; and it's impossible for a style writer to write a style that guarantees workability w/o studying all of Qt's widgets and the proxy. And it still might not work right with custom widget. And as a general rule, I do not make changes where I can't make a reasonable argument for correctness.

Comment 4 acidrums4 2013-01-20 15:38:51 UTC

So it's been 4 years and a half. At this very moment, how are things about this? I can't believe Razor-Qt has implemented this thing (http://fav.me/d4k4uar) and seem there's no news about it in KDE. Any plans for this? Will we ever see this?

Comment 5 Christoph Feck 2013-01-27 00:46:48 UTC

This feature will not be implemented, see comment #1 and comment #3.

Comment 6 acidrums4 2013-01-27 12:57:46 UTC

(In reply to comment #5)
Maybe I was not clear enough: Qt5 is on its way. I don't know if things about that CSS layering will still doing the same with native widgets, or rather CSS will be a way to customize widgets from native and not putting an extra layer above of them.

Comment 7 Eric Francis 2014-02-17 17:04:06 UTC

*** This bug has been confirmed by popular vote. ***

Comment 8 Nate Graham 2022-06-01 17:04:10 UTC

*** Bug 454484 has been marked as a duplicate of this bug. ***