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kwin'MyButton (./kdebase/kwin/clients/kwmtheme/kwmthemeclient.h:12)

class MyButton : public QToolButton
{
public:
    MyButton(QWidget *parent=0, const char *name=0)
        : QToolButton(parent, name){setAutoRaise(true);}
protected:
    void drawButtonLabel(QPainter *p);
};

kwin'MyButton::drawButtonLabel() (./kdebase/kwin/clients/kwmtheme/kwmthemeclient.cpp:157)

void MyButton::drawButtonLabel(QPainter *p)
{
    if(pixmap()){
        style().drawItem(p, 0, 0, width(), height(), AlignCenter, colorGroup(),
                         true, pixmap(), QString::null);
    }
}