qt5base-lts/examples/painting/shared/hoverpoints.h

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#ifndef HOVERPOINTS_H
#define HOVERPOINTS_H

#include <QtWidgets>

QT_FORWARD_DECLARE_CLASS(QBypassWidget)

class HoverPoints : public QObject
{
    Q_OBJECT
public:
    enum PointShape {
        CircleShape,
        RectangleShape
    };

    enum LockType {
        LockToLeft   = 0x01,
        LockToRight  = 0x02,
        LockToTop    = 0x04,
        LockToBottom = 0x08
    };

    enum SortType {
        NoSort,
        XSort,
        YSort
    };

    enum ConnectionType {
        NoConnection,
        LineConnection,
        CurveConnection
    };

    HoverPoints(QWidget *widget, PointShape shape);

    bool eventFilter(QObject *object, QEvent *event);

    void paintPoints();

    inline QRectF boundingRect() const;
    void setBoundingRect(const QRectF &boundingRect) { m_bounds = boundingRect; }

    QPolygonF points() const { return m_points; }
    void setPoints(const QPolygonF &points);

    QSizeF pointSize() const { return m_pointSize; }
    void setPointSize(const QSizeF &size) { m_pointSize = size; }

    SortType sortType() const { return m_sortType; }
    void setSortType(SortType sortType) { m_sortType = sortType; }

    ConnectionType connectionType() const { return m_connectionType; }
    void setConnectionType(ConnectionType connectionType) { m_connectionType = connectionType; }

    void setConnectionPen(const QPen &pen) { m_connectionPen = pen; }
    void setShapePen(const QPen &pen) { m_pointPen = pen; }
    void setShapeBrush(const QBrush &brush) { m_pointBrush = brush; }

    void setPointLock(int pos, LockType lock) { m_locks[pos] = lock; }

    void setEditable(bool editable) { m_editable = editable; }
    bool editable() const { return m_editable; }

public slots:
    void setEnabled(bool enabled);
    void setDisabled(bool disabled) { setEnabled(!disabled); }

signals:
    void pointsChanged(const QPolygonF &points);

public:
    void firePointChange();

private:
    inline QRectF pointBoundingRect(int i) const;
    void movePoint(int i, const QPointF &newPos, bool emitChange = true);

    QWidget *m_widget;

    QPolygonF m_points;
    QRectF m_bounds;
    PointShape m_shape;
    SortType m_sortType;
    ConnectionType m_connectionType;

    QVector<uint> m_locks;

    QSizeF m_pointSize;
    int m_currentIndex;
    bool m_editable;
    bool m_enabled;

    QHash<int, int> m_fingerPointMapping;

    QPen m_pointPen;
    QBrush m_pointBrush;
    QPen m_connectionPen;
};


inline QRectF HoverPoints::pointBoundingRect(int i) const
{
    QPointF p = m_points.at(i);
    qreal w = m_pointSize.width();
    qreal h = m_pointSize.height();
    qreal x = p.x() - w / 2;
    qreal y = p.y() - h / 2;
    return QRectF(x, y, w, h);
}

inline QRectF HoverPoints::boundingRect() const
{
    if (m_bounds.isEmpty())
        return m_widget->rect();
    else
        return m_bounds;
}

#endif // HOVERPOINTS_H