Russian Qt Forum

#include <QWidget>
#include <QPaintEvent>
#include <QStylePainter>
#include <QStyleOptionButton>

class Widget : public QWidget
{
public:
    Widget(QWidget *parent = 0) : QWidget(parent) {}

    void paintEvent(QPaintEvent *e);
};

void Widget::paintEvent(QPaintEvent *e)
{
    QWidget::paintEvent(e);
    QStylePainter p(this);
    QStyleOptionButton *option = new QStyleOptionButton;
    option->initFrom(this);
    option->features = QStyleOptionButton::None;
//    if (d->flat)
        option->features |= QStyleOptionButton::Flat;
    option->text = "d->text";
    p.drawControl(QStyle::CE_PushButton, *option);
    delete option;
}

// установка палитры:
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    
    Widget *widget = new Widget;
    QPalette pal = widget->palette();
    pal.setColor(QPalette::Button, Qt::red);
    widget->setPalette(pal);
    widget->setAutoFillBackground(true);
    widget->show();

    return a.exec();
}