qt调用重写GraphicsView后的类的方法

TGraphicsView *view = new TGraphicsView(this);
     //ui->horizontalLayout->addWidget(view);
         view->setScene(scene);
         setCentralWidget(view);

TGraphicsView类继承了GraphicsView类

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "tgraphicsview.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);



   // QGraphicsView view(&scene);
    //view.show();
    QGraphicsScene *scene = new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);
     QPixmap  image =  QPixmap (":/img/qq.jpg");
    // scene->addText("Hello, world!");

     double scale = 1.0;
     double scaleX = static_cast<double>(ui->graphicsView->width()) / (image.width() + 1);// 不+1会有滚动条
     double scaleY = static_cast<double>(ui->graphicsView->height()) / (image.height() + 1);// 不+1会有滚动条
     if (scaleX > scaleY)
     {
         scale = scaleY;
     }
     else
     {
         scale = scaleX;
     }

     // 缩放
     //image = image.scaled(image.width() * scale, image.height() * scale, Qt::KeepAspectRatio);

     scene->addPixmap(image);

     TGraphicsView *view = new TGraphicsView(this);
     //ui->horizontalLayout->addWidget(view);
         view->setScene(scene);
         setCentralWidget(view);





        // scene->clear();
        // scene->addPixmap(image);
        // scene->update();
        // this->resetTransform();
       //  this->setSceneRect(image.rect());
        // this->fitInView(QRect(0, 0, m_image.width(), m_image.height()), Qt::KeepAspectRatio);





}
//缩略图测试
MainWindow::~MainWindow()
{
    delete ui;
}