Problem with drawing focus frame in Qt

I'm trying to create custom widget inheriting QFrame. All works fine, but I'm unable to draw the focus rectangle around my widget. Below is the sample code I use for drawing:

frame.h

class Frame : public QFrame {
Q_OBJECT
public:
    Frame(QWidget *parent = 0);
    ~Frame();

protected:
    void paintEvent(QPaintEvent *event);

private:
    Ui::Frame *ui;
};

frame.cpp

Frame::Frame(QWidget *parent) :
    QFrame(parent),
    ui(new Ui::Frame)
{
    ui->setupUi(this);
    setFocusPolicy(Qt::ClickFocus);
}

Frame::~Frame()
{
    delete ui;
}

void Frame::paintEvent(QPaintEvent *event)
{
    QFrame::paintEvent(event);
    if (hasFocus()) {
        QStylePainter painter(this);
        QStyleOptionFocusRect option;
        option.initFrom(this);
        option.backgroundColor = palette().dark().color();
        painter.drawPrimitive(QStyle::PE_FrameFocusRect, option);
    }
}

What I mean by 'unable to draw focus frame' is that w开发者_JAVA技巧hen you click a standard widget that accepts focus (let's say QLineEdit), it has a blue rectangle drawn around it. When I click my widget there is no such rectangle drawn. Are there any more things I should do besides setting focusPolicy on my widget?

It might have something to do with the style your app is using. When I try your code with the "gtk" and "cleanlooks" style, no focus rectangle is drawn. With "plastique" and "windows" it is. Since I'm on Linux, I cannot test "windowsxp" and "macintosh". Try running with the -style option and see what happens.

try also

setFocusPolicy(Qt::StrongFocus);
setAttribute( Qt::WA_MacShowFocusRect);