Override a stylesheet

Rory_1

In my project I have set a default background and text color for QWidget, which all the other widgets inherit. I would prefer not to have to set this for every type of widget I am using.

However, if you set a default style at the widget level, how do you override that style for an individual element? In the attached example, I have set the background gray and text light gray for QWidget and I want to show a label with red text, but not all labels.

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QWidget *centralWidget = new QWidget(this);
    QVBoxLayout *verticalLayout = new QVBoxLayout(centralWidget);
    QLabel *label = new QLabel(centralWidget);
    verticalLayout->addWidget(label);

    // does not change label text color when setStyleSheet for QWidget
    setStyleSheet("QWidget {background-color: rgb(95,95,95); color: rgb(229,229,229);}");

    label->setText("TEST COLOR");
    QPalette palette = label->palette();
    palette.setColor(QPalette::WindowText, Qt::red);
    label->setPalette(palette);
}

The text is red without the setStyleSheet statement.

Rory_1

I've got a solution by subclassing QLabel and overriding the paintEvent. Any comments on this are most welcome.

DropShadowLabel::DropShadowLabel(QWidget *parent) : QLabel(parent)
{

}

void DropShadowLabel::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::TextAntialiasing, true);

    QRect rect1(1,1,this->width()-2,this->height()-2);
    QRect rect2(3,3,this->width()-2,this->height()-2);
    painter.setPen(Qt::black);
    painter.drawText(rect2, text());
    painter.setPen(Qt::white);
    painter.drawText(rect1, text());
}

ValentinMichelet

@Rory_1 said:

However, if you set a default style at the widget level, how do you override that style for an individual element?

If you want to set a style sheet for one element, first, you have to give it a name:

AnyQtWidget* myWidget = new AnyQtWidget;
myWidget->setObjectName("MySpecialWidget");

Then, you can set its style:

setStyleSheet("AnyQtWidget#MySpecialWidget {"
  "stuff"
"}");

This way, the style sheet will apply on your special widget only.

Rory_1

Thanks very much. That is what I was looking for.