class GraphicDisplay : public QDialog, public Ui::GraphicDisplayClass
{
    Q_OBJECT
// ........................
signals:
    void movingPoint(const QPoint&);
};

/// Добавление нового визира
void GraphicDisplay::appendViewfinder(QFrame::Shape current_shape)
{
    VFFrame* finder(new VFFrame(paramsDisplay, current_shape));
    finder -> setGraphicDisplay(this);
    viewfinderList.append(finder);
    viewfinderList.last() -> show();
}

/// Проверка на попадание фокуса на визир
bool GraphicDisplay::isViewfinder(const QPoint& pos) const
{
    foreach(VFFrame* pf, viewfinderList)
        if(pf -> isViewfinder())
        {
            emit movingPoint(pos);
            return true;
        }
    return false;
}


class VFFrame: public QFrame
{
    Q_OBJECT

private:
    GraphicDisplay* _graph;        ///< указатель на окно графика

private slots:
    void setMovePoint(const QPoint& pnt) { _move_point = pnt; }

public:
    void setGraphicDisplay(GraphicDisplay* pGr) { _graph = pGr; }
};

VFFrame::VFFrame(QWidget *parent, const Shape shape): QFrame(parent), _vf_shape(shape), _is_left_pressed(false), _is_viewfinder(false), _move_point(QPoint(0, 0)), _graph(0)
{
connect(_graph, SIGNAL(movingPoint(const QPoint&)), SLOT(setMovePoint(const QPoint&))); 
}