@tim-hilt Can you describe verbally which palette should be changed? The application palette? A specific widget’s palette? Something else? We’ll find it out!

@Gojir4 said in Styling the QMdiArea using the the fusion style and QPalette (dark theme):

darkPalette.setColor(QPalette::Disabled, QPalette::Shadow, QColor(r, g, b));

(Edited)
tried, but it didn't work. I suspect that underneath it's a QLabel with a raised text but I don't know how to set the color of those using QPalette

It is not clear what you want to do.

If you have a few buttons with different background color and connected signal clicked to slo6t lets day onClick();

and within such slot you want to find color of the button background which was clicked,
first thing you need to find - which button was clicked.

There are a few ways to find it.
Simplest (not the best) is to call sender() within a slot.
Cast ( use qobject_cast) to a QPushButton* ( or whatever your buttons are ),
check its background if it is null.

Why this way is not the best? It makes an assumption that slot is only called as a result of button click,
which can't be guaranteed.

It is better to use QSignalMapper.