Error code after inheriting QGraphicsView

[K.Sejdak]

The scene object is a private member of MainWindow class (not pointer) and the view, just as I said, was replaced with the "widget" object in Qt Designer so I don't create it myself. I will provide the header files to be clear:

MainWindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QWidget>
#include <QtGui>
 
namespace Ui
{
    class MainWindow;
}
 
class MainWindow : public QWidget
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
public slots:
	void loadImage();
 
private:
    Ui::MainWindow *ui;
	QPixmap image;
	QGraphicsScene scene;
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QWidget>
#include <QtGui>

namespace Ui
{
    class MainWindow;
}

class MainWindow : public QWidget
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

public slots:
	void loadImage();

private:
    Ui::MainWindow *ui;
	QPixmap image;
	QGraphicsScene scene;
};

#endif // MAINWINDOW_H

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GraphicsView.h

#ifndef GRAPHICSVIEW_H
#define GRAPHICSVIEW_H
 
#include <QGraphicsView>
#include <QtGui>
 
class GraphicsView : public QGraphicsView
{
    Q_OBJECT
public:
	explicit GraphicsView(QWidget *parent = 0);
	~GraphicsView();
	void loadImage(QPixmap item);
	virtual void mouseReleaseEvent (QMouseEvent *event);
 
signals:
 
public slots:
 
private:
	QPixmap image;
	QPoint point1;
	QPoint point2;
	QGraphicsRectItem rect;
	bool firstRect;
};
 
#endif // GRAPHICSVIEW_H

#ifndef GRAPHICSVIEW_H
#define GRAPHICSVIEW_H

#include <QGraphicsView>
#include <QtGui>

class GraphicsView : public QGraphicsView
{
    Q_OBJECT
public:
	explicit GraphicsView(QWidget *parent = 0);
	~GraphicsView();
	void loadImage(QPixmap item);
	virtual void mouseReleaseEvent (QMouseEvent *event);

signals:

public slots:

private:
	QPixmap image;
	QPoint point1;
	QPoint point2;
	QGraphicsRectItem rect;
	bool firstRect;
};

#endif // GRAPHICSVIEW_H

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Now you have almost all my code (only main is left).