Russian Qt Forum

C++ (Qt)
// ...
public:
    WidgetAbout *widgetAbout;
 

C++ (Qt)
// ...
widgetAbout = new WidgetAbout;
// ...
 

QLabel { color: red;}

QWidget.slide, WidgetAbout, WidgetAbout.slide, widgetAbout.slide, widgetAbout, Widget.slide { background-color: #fff;}

C++ (Qt)
// ...
widgetAbout = new WidgetAbout;
widgetAbout->setStyleSheet("background:#fff;");
// ...
 

C++ (Qt)
void WidgetAbout::paintEvent(QPaintEvent *)
{
    QStyleOption styleOption;
    styleOption.init(this);
    QPainter painter(this);
    style()->drawPrimitive(QStyle::PE_Widget, &styleOption, &painter, this);
}
 

CSS
WidgetAbout { background-color: #fff;}

C++ (Qt)
 void CustomWidget::paintEvent(QPaintEvent *)
 {
     QStyleOption opt;
     opt.init(this);
     QPainter p(this);
     style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
 }
 

C++ (Qt)
widget.setStyleSheet("background-color: red;");

C++ (Qt)
app.setStyleSheet("CXTestClass { background-color: red; }");