Style Sheet Syntax background

[Tondog]

I want to have the background only from a QWidget black. The background from the QPushbuttons, QSliders etc. shoud be normal.
I use the Style-Syntax:

QWidget {
background-color:rgb(20, 20, 20);
}

I read in the Qt Assistant (Stylesheet-Syntax) that i must make bevore the QWidget a point:

.QWidget {
background-color:rgb(20, 20, 20);
}

I have now the problam that this didn't work.

Thanks for help.

[Lykurg]

well it works, but only for QWidgets! No subclass, even not your own if they only inherit QWidget.

maybe you provide a small executable example showing your problem.

[Tondog]

I had this code and it didn't work, the background from the QWidget wouldn't be darker:

QColor bgColor = palette().color(QPalette::Window).darker(110);
	QString styleSheet = ".QWidget {  background-color:rgb(%1, %2 ,%3);}";
	styleSheet = styleSheet.arg(bgColor.red()).arg(bgColor.green()).arg(bgColor.blue());
	setStyleSheet(styleSheet);

QColor bgColor = palette().color(QPalette::Window).darker(110);
	QString styleSheet = ".QWidget {  background-color:rgb(%1, %2 ,%3);}";
	styleSheet = styleSheet.arg(bgColor.red()).arg(bgColor.green()).arg(bgColor.blue());
	setStyleSheet(styleSheet);

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[Lykurg]

Well your are setting the style sheet on what kind of object? I seems that is is a subclass, which, as told, wont work. But you can use ".NAMEOFYOURCLASS" and then it should work.

[Tondog]

Yes, it's a own subclass from QWidget. I use:

QString styleSheet = ".myOwnClass {background-color:rgb(%1, %2, %3)}";

QString styleSheet = ".myOwnClass {background-color:rgb(%1, %2, %3)}";

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but it didnt' work. I think it's a problem of the syntax, because

QString styleSheet = "QWidget {background-color:rgb(%1, %2, %3)}";

QString styleSheet = "QWidget {background-color:rgb(%1, %2, %3)}";

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works and

QString styleSheet = ".QWidget {background-color:rgb(%1, %2, %3)}";

QString styleSheet = ".QWidget {background-color:rgb(%1, %2, %3)}";

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didn't work.

[Tondog]

I solved the problem:

QString styleSheet = "QWidget#MyOwnClass {background-color:rgb(%1, %2, %3)}";

QString styleSheet = "QWidget#MyOwnClass {background-color:rgb(%1, %2, %3)}";

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Now it works.
But I don't now why the other syntax don't work.

Thanks for your efforts