#ifndef DRAGGABLELINE_H
#define DRAGGABLELINE_H

#include <QGraphicsLineItem >
#include <QObject>

class DraggableLine : public QGraphicsLineItem {
public:
    DraggableLine(const QLineF& line, QGraphicsItem* parent = nullptr)
        : QGraphicsLineItem(line, parent), draggingStart(false), draggingEnd(false) {
        setAcceptHoverEvents(true);
        setFlag(QGraphicsItem::ItemIsSelectable, true);
        setFlag(QGraphicsItem::ItemIsMovable, false); // 禁用整体移动，只允许拖动端点
    }

protected:
    void mousePressEvent(QGraphicsSceneMouseEvent* event) override;
    void mouseMoveEvent(QGraphicsSceneMouseEvent* event) override;
    void mouseReleaseEvent(QGraphicsSceneMouseEvent* event) override;
    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget) override;

private:
    bool draggingStart;
    bool draggingEnd;
    QPointF offset;

    bool isNearPoint(const QPointF& pos, const QPointF& point) const;
};

#endif // DRAGGABLELINE_H