Qt Snippet: use stylesheet in a QWidget derived class

If you derive your class directly from QWidget object and want to apply some stylesheet tags for customize interface you'll find that your stylesheet settings will not work.



Just only a simply stylesheet tag for set background color as follow will not have any effect:

myDerivedWidget.setStyleSheet("background-color: red;");

This because basic QWidget object doesn't automatically manage stylesheet tags. Fortunately add this feature is very easy. What you need to do is to overwrite paint event in your derived class and add the following code:

void myDerivedClass::paintEvent(QPaintEvent* event)
{
    QPainter painter(this);
    QStyleOption StyleOpt;

    StyleOpt.initFrom(this);
    style()->drawPrimitive(QStyle::PE_Widget, &StyleOpt, &painter, this);
}

This will allow the first example stylesheet tag to work as expected.