QT应用编程: QGraphicsTextItem单击选中、双击进入编辑状态

#ifndef MY_GRAPHICSTEXTITEM_H
#define MY_GRAPHICSTEXTITEM_H
#include <QGraphicsTextItem>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QDebug>
#include <QGraphicsSceneMouseEvent>
#include <QKeyEvent>
#include <QApplication>
class my_graphicsTextItem: public QGraphicsTextItem
{
    Q_OBJECT
public:
    my_graphicsTextItem(QWidget *parent = nullptr){}
    ~my_graphicsTextItem(){}
    QString m_store_str;//用于保存
signals:
    void EditStatus(bool);
protected:
        void focusInEvent(QFocusEvent *event) override{
            if(event->reason() != Qt::PopupFocusReason){//注意右键菜单再次进入焦点时不保存原始文本
                m_store_str = toPlainText();//保存原始文本
            }
            QGraphicsTextItem::focusInEvent(event);
        }

        void focusOutEvent(QFocusEvent *event) override{
            if(event->reason() == Qt::MouseFocusReason && QApplication::mouseButtons()==Qt::RightButton)
            {
                //右键点击其他地方失去焦点，定义为取消操作，恢复原始文本
                setPlainText(m_store_str);
                setTextInteractionFlags(Qt::NoTextInteraction);//恢复不能编辑状态
                emit EditStatus(false);//编辑完成(发送信号出去)
            }
            else if(event->reason() == Qt::PopupFocusReason)
            {
                //右键弹出菜单时不做处理
            }
            else
            {  //其他情况，包括下面点击回车的情况，编辑成功，发送信号给父对象
                setTextInteractionFlags(Qt::NoTextInteraction);
                emit EditStatus(false);//编辑完成(发送信号出去)
            }
            QGraphicsTextItem::focusOutEvent(event);
        }

        void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)override{
            if(event->button() == Qt::LeftButton){//左键双击进入可编辑状态并打开焦点
                emit EditStatus(true);//正在编辑
                setTextInteractionFlags(Qt::TextEditorInteraction);
                setFocus();
                QGraphicsTextItem::mouseDoubleClickEvent(event);
            }
        }
        void keyPressEvent(QKeyEvent *event) override{
            if(event->key() == Qt::Key_Return||event->key() == Qt::Key_Enter)
            {
            //点击回车失去焦点，编辑完成，后续给FocusOutEvent处理
                clearFocus();
            }else{
                QGraphicsTextItem::keyPressEvent(event);
            }
        }
};
#endif // MY_GRAPHICSTEXTITEM_H