How is possible put QGraphicsView to own method as argument? - c++

Question

So, I have the source code for a training. Where I want to do operation with QGraphicsView named pp in the own class ProcessPicture.
I would ask you, is it possible to put the QGraphicsView object to the method of own class? If yes, please tell me how or lead me on answer.
For a detailed description after releasing button will done the on_processPic_pushButton_released() where is called the method of pp object. This method take a ui->graphicsview as argument. This argument will used in the pp.drawrectangle(ui->graphicsview).
The code is without error or warning, only it is not draw the rectangle to the ui->graphicsview. When I take a source code from pp.drawrectangle() and try it, in the on_processPic_pushButton_released() all is fine. So I think that i miss some knowledge.
Lets look on my source code.
processpicture.h
#ifndef PROCESSPICTURE_H
#define PROCESSPICTURE_H
#include "QString"
#include "QPicture"
#include "QGraphicsView"
class ProcessPicture
{
public:
ProcessPicture();
void draw(QGraphicsView out);
void draw_rectangle(QGraphicsView out);
private:
QString path = "***/Untitled.bmp";
QImage img;
};
#endif // PROCESSPICTURE_H
processpicture.cpp
#include "processpicture.h"
#include "QGraphicsScene"
#include "QGraphicsPixmapItem"
ProcessPicture::ProcessPicture()
{
img.load(path);
}
void ProcessPicture::draw_rectangle(QGraphicsView out){
//QGraphicsScene* scene = new QGraphicsScene();
QGraphicsScene scene;
QRect rect;
rect.setRect(10,10,10,10);
scene.addRect(rect);
out.setScene(&scene);
out.show();
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include "processpicture.h"
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
ProcessPicture *pp;
//pp = new ProcessPicture;
~MainWindow();
private:
private slots:
void on_processPic_pushButton_released();
private:
Ui::MainWindow *ui;
bool event(QEvent *event);
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
pp = new ProcessPicture;
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_processPic_pushButton_released()
{
//pp->draw(ui->graphicsView);
pp->draw_rectangle(ui->graphicsView);
}
For every non-toxic answer I thank.