[Development] Qt 6: Assigning QPalette to ApplicationWindow.palette no longer supported?

[Fabian Kosmale]

Hi Marcel,

as Vitaly mentioned, palette was never explicitly documented to be a QPalette.
We're currently discussing internally whether we still want to support binding a QPalette property
to a palette QML property in Qt 6; and if yes, how to do it.
We'll provide an update (+ justification) once we've come to a decision.

What should work (both in 5.x and 6.0) is to use https://doc.qt.io/qt-5/qguiapplication.html#setPalette
Does that functionality cover your use case?


Fabian


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________________________________
Von: Development <development-bounces at qt-project.org> im Auftrag von Marcel Krems <marcel.k.dev at gmail.com>
Gesendet: Freitag, 21. August 2020 22:24
An: development at qt-project.org <development at qt-project.org>
Betreff: [Development] Qt 6: Assigning QPalette to ApplicationWindow.palette no longer supported?

Hi,

I recently implemented a theming system for my Qt Quick application.

With Qt 6 I'm getting an error: "Unable to assign QPalette to
QQuickPalette*"
This was changed in the following commits:
  - https://codereview.qt-project.org/c/qt/qtquickcontrols2/+/270097
  - https://codereview.qt-project.org/c/qt/qtdeclarative/+/270092

My Theme class looks like this:
class Theme : public QObject
{
     Q_OBJECT
     Q_PROPERTY(QPalette palette MEMBER _palette NOTIFY themeChanged)
     ...
};

In my main.qml I'm setting the palette with:
ApplicationWindow {
     palette: Theme.palette
     ...
}

My question is:
Is my use case no longer supported or is this a regression?
And if not, what is the proposed way to do it? Preferrably compatible
with Qt 5.15 and Qt 6.
Do I have to set every single colorrole of the palette separately?
E.g.
ApplicationWindow {
     palette {
         active {
             buttonText: Theme.buttonText
             button: Theme.button
             ...
         }

         disabled {
             buttonText: Theme.buttonTextDisabled
             button: Theme.buttonDisabld
         }
     }
}


Kind regards,
Marcel
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