#ifndef DRAGGABLELINE_H
#define DRAGGABLELINE_H
#include <QApplication>
#include <QWidget>
#include <QPainter>
#include <QMouseEvent>
#include <QString>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsRectItem>
#include <QMouseEvent>
#include <QLabel>
#include <QPointer>
#include <QGraphicsItem>
#include <QPainter>
#include <QColor>
#include <QGraphicsSceneEvent>
#include <QDebug>
#include <QFrame>

// 1. 创建自定义线段类（继承QGraphicsLineItem）
class DraggableLine : public QGraphicsLineItem {
public:
    explicit DraggableLine(QGraphicsItem* parent = nullptr)
        : QGraphicsLineItem(parent) {
        setFlag(QGraphicsItem::ItemIsMovable, false); // 禁用整体移动
        setAcceptHoverEvents(true);
    }

    // 2. 鼠标事件处理
protected:
    void mousePressEvent(QGraphicsSceneMouseEvent* event) override;

    void mouseMoveEvent(QGraphicsSceneMouseEvent* event) override;

    void mouseReleaseEvent(QGraphicsSceneMouseEvent*) override;

    // 3. 可视化增强（绘制端点）
    void paint(QPainter* painter, const QStyleOptionGraphicsItem*, QWidget*) override ;

private:
    bool draggingStart = false;
    bool draggingEnd = false;

    double distance(const QPointF& p1, const QPointF& p2);
};

#endif // DRAGGABLELINE_H