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#include <QtGui>

#include <QApplication>

class MyPushButton : public QPushButton

{

public:

    MyPushButton(QWidget *parent = 0);

    void paintEvent(QPaintEvent *);

};

MyPushButton::MyPushButton(QWidget *parent)

    : QPushButton(parent)

{

}

//! [0]

void MyPushButton::paintEvent(QPaintEvent *)

{

    QStyleOptionButton option;

    option.initFrom(this);

    option.state = isDown() ? QStyle::State_Sunken : QStyle::State_Raised;

    if (isDefault())

        option.features |= QStyleOptionButton::DefaultButton;

    option.text = text();

    option.icon = icon();

    QPainter painter(this);

    style()->drawControl(QStyle::CE_PushButton, &option, &painter, this);

}

//! [0]

class MyStyle : public QStyle

{

public:

    MyStyle();

    void drawPrimitive(PrimitiveElement element, const QStyleOption *option,

                       QPainter *painter, const QWidget *widget);

};

MyStyle::MyStyle()

{

//! [1]

    QStyleOptionFrame *option;

    if (const QStyleOptionFrame *frameOption =

           qstyleoption_cast<const QStyleOptionFrame *>(option)) {

        QStyleOptionFrameV2 frameOptionV2(*frameOption);

        // draw the frame using frameOptionV2

    }

//! [1]

//! [2]

    if (const QStyleOptionProgressBar *progressBarOption =

           qstyleoption_cast<const QStyleOptionProgressBar *>(option)) {

        QStyleOptionProgressBarV2 progressBarV2(*progressBarOption);

        // draw the progress bar using progressBarV2

    }

//! [2]

//! [3]

    if (const QStyleOptionTab *tabOption =

           qstyleoption_cast<const QStyleOptionTab *>(option)) {

        QStyleOptionTabV2 tabV2(*tabOption);

        // draw the tab using tabV2

   }

//! [3]

}

//! [4]

void MyStyle::drawPrimitive(PrimitiveElement element,

                            const QStyleOption *option,

                            QPainter *painter,

                            const QWidget *widget)

{

    if (element == PE_FrameFocusRect) {

        const QStyleOptionFocusRect *focusRectOption =

                qstyleoption_cast<const QStyleOptionFocusRect *>(option);

        if (focusRectOption) {

            // ...

        }

    }

    // ...

}

//! [4]

int main(int argc, char *argv[])

{

    QApplication app(argc, argv);

    MyPushButton button;

    button.show();

    return app.exec();

}