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Hi David,</div>
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I just did some debugging to find out, how KDE Palettes are promoted to the QKdeTheme.<br>
The blunt answer is: They don't, and they have never been.</div>
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<br>
They were probably meant to be promoted at some point, because QKdeTheme implements an array of QPalette pointers (size == NPalettes == 17).<br>
So for each palette type, a new QPalette could be constructed from a KDE Palette. But that's not happening. The first record of the array is populated with default constructed QPalette, which is a fusion palette.<br>
All other records are initialized with nullptr and they remain like that throughout the life time of the QGuiApplication.</div>
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QKdeTheme just implements font handling. Color wise, QGuiApplications won't blend in with KDE palettes. They just stick with a default fusion palette.</div>
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That said: I think there's nothing needed right now. But we may want to pimp up QKdeTheme.<br>
The patch I mentioned factors it out from qgenericunixthemes.cpp. So enhancing the class will become a little easier.</div>
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Cheers<br>
Axel</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> David Redondo <kde@david-redondo.de><br>
<b>Sent:</b> Monday, 10 March 2025 17:39<br>
<b>To:</b> kde-devel@kde.org <kde-devel@kde.org><br>
<b>Cc:</b> Axel Spoerl <axel.spoerl@qt.io><br>
<b>Subject:</b> Re: Programmatic color scheme change in QKdeTheme</font>
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Hi Alex,<br>
<br>
Am Montag, 10. März 2025, 16:49 schrieb Axel Spoerl:<br>
> Hi KDE folks,<br>
><br>
> Qt 6.8 has implemented QPlatformTheme::requestColorScheme() as a virtual function. It is meant to allow a programmatic color scheme change within a QGuiApplication. If the system's theme is dark, the application can still be light and vice versa.<br>
> <a href="https://codereview.qt-project.org/c/qt/qtbase/+/628010">https://codereview.qt-project.org/c/qt/qtbase/+/628010</a> re-implements this function in QKdeTheme. In case of a deviation (requested color scheme != system color scheme), it falls back to
a fusion palette (of which a dark and a light version exist).<br>
><br>
<br>
Do you think it would be helpful if we would give you the palettes that result when using Breeze and Breeze Dark colors that you could use instead of fusion?<br>
<br>
Also thanks for the heads up, maybe it's something we need to implement in our own QPlatformTheme.<br>
<br>
David<br>
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