editor/mygraphicsview.h

#ifndef MYGRAPHICSVIEW_H
#define MYGRAPHICSVIEW_H

#include <QGraphicsView>
#include <QDropEvent>
#include <QDragEnterEvent>
#include <QMimeData>
#include <QKeyEvent>
#include <QMouseEvent>
#include "item.h"
#include "connection.h"

class MyGraphicsView : public QGraphicsView
{
    Q_OBJECT
public:
    explicit MyGraphicsView(QWidget *parent = nullptr);

protected:
    void dragEnterEvent(QDragEnterEvent *event) override;
    void dragMoveEvent(QDragMoveEvent *event) override;
    void dropEvent(QDropEvent *event) override;
    void keyPressEvent(QKeyEvent *event) override;
    void contextMenuEvent(QContextMenuEvent *event) override;

    void mousePressEvent(QMouseEvent *event) override;
    void mouseMoveEvent(QMouseEvent *event) override;
    void mouseReleaseEvent(QMouseEvent *event) override;

private:
    Item* anchorItemAt(const QPoint& viewPos, Item::AnchorType& anchorType);

    bool drawingConnection_ = false;
    Item* startItem_ = nullptr;
    Item::AnchorType startAnchor_;
    QGraphicsLineItem* tempLine_ = nullptr;

    struct ClipInfo {
        QString input;
    };
    static ClipInfo clipboard_;

public slots:
    void onItemRequestCopy(Item*);
    void onItemRequestDelete(Item*);
};

#endif // MYGRAPHICSVIEW_H