Panel

/* Panel class */
class HoverableWidget : public QWidget
{
    Q_OBJECT

public:
    HoverableWidget(qint32 min, qint32 max) :
        minsize(min), maxsize(max)
    {
        this->setProperty("hover", "neutral");

        this->setMinimumWidth(minsize);
        this->setMaximumWidth(minsize);

        this->style()->unpolish(this);
        this->style()->polish(this);
        this->update();

        hold = false;
    }

public slots:
    void holdpanel   () { hold = true; }
    void releasepanel() { hold = false;}
    void closepanel  () { leaveEvent(NULL); }

public:
    void enterEvent(QEvent *)
    {
        if (!hold)
        {
            this->setProperty("hover", "hovered");

            this->setMinimumWidth(maxsize);
            this->setMaximumWidth(maxsize);

            this->style()->unpolish(this);
            this->style()->polish(this);
            this->update();
        }
    }
    void leaveEvent(QEvent *)
    {
        if (!hold)
        {
            this->setProperty("hover", "neutral");

            this->setMinimumWidth(minsize);
            this->setMaximumWidth(minsize);

            this->style()->unpolish(this);
            this->style()->polish(this);
            this->update();
        }
    }
    void paintEvent(QPaintEvent *)
    {
        QStyleOption o;
        o.initFrom(this);
        QPainter p(this);
        style()->drawPrimitive(QStyle::PE_Widget, &o, &p, this);
    }

private:
    qint32  minsize;
    qint32  maxsize;
    bool    hold;
};