qt6windows7/examples/widgets/painting/shared/hoverpoints.h

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#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) override;

    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(const QPointF &p) const;
    void movePoint(qsizetype i, const QPointF &newPos, bool emitChange = true);

    QWidget *m_widget;

    QPolygonF m_points;
    QRectF m_bounds;
    PointShape m_shape;
    SortType m_sortType = NoSort;
    ConnectionType m_connectionType = CurveConnection;

    QList<uint> m_locks;

    QSizeF m_pointSize{11, 11};
    qsizetype m_currentIndex= -1;
    bool m_editable = true;
    bool m_enabled = true;

    QHash<int, qsizetype> m_fingerPointMapping;

    QPen m_pointPen{QColor(255, 255, 255, 191), 1};
    QBrush m_pointBrush{QColor(191, 191, 191, 127)};
    QPen m_connectionPen{QColor(255, 255, 255, 127), 2};
};

inline QRectF HoverPoints::pointBoundingRect(const QPointF &p) const
{
    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