Subclassing QGraphicsView crash the app

Hello all!

I am trying to subclass QGraphicsView, but its crashing the app.

How can I do that.

fluxocaixagraphicsview.h

Code:

---

#ifndef FLUXOCAIXAGRAPHICSVIEW_H
#define FLUXOCAIXAGRAPHICSVIEW_H
 
#include <QGraphicsView>
#include <QGraphicsScene>
//#include <QGraphicsLineItem>
 
class fluxoCaixaGraphicsView : public QGraphicsView
{
public:
    explicit fluxoCaixaGraphicsView(QWidget *parent = 0);
    ~fluxoCaixaGraphicsView();
 
private:
    QGraphicsScene *cenario;
 
protected:
    void showEvent(QShowEvent *event);
    void resizeEvent(QResizeEvent *event);
};
 
#endif // FLUXOCAIXAGRAPHICSVIEW_H

---

fluxocaixagraphicsview.cpp

Code:

---

#include "fluxocaixagraphicsview.h"
 
fluxoCaixaGraphicsView::fluxoCaixaGraphicsView(QWidget *parent) :
    QGraphicsView(parent)
{
    QGraphicsScene *cenario = new QGraphicsScene(this);
}
 
fluxoCaixaGraphicsView::~fluxoCaixaGraphicsView()
{
 
}
 
void fluxoCaixaGraphicsView::showEvent(QShowEvent *event)
{
 
}
 
void fluxoCaixaGraphicsView::resizeEvent(QResizeEvent *event)
{
 
}

---

calling it

Code:

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QWidget *MainWindow::criaEstruturaNovoIvestimento()
{
    //code here
 
    fluxoCaixaGraphicsView *graphicsViewFluxoCaixa = new fluxoCaixaGraphicsView(boxInvestimento3);
 
    //code here
}

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Thanks a lot

Code:

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fluxoCaixaGraphicsView::fluxoCaixaGraphicsView(QWidget *parent) :
    QGraphicsView(parent)
{
    QGraphicsScene *cenario = new QGraphicsScene(this);
}

---

you just declared a local variable named "cenario", it is not the same as your "cenario" in the header file
change this to

Code:

---

fluxoCaixaGraphicsView::fluxoCaixaGraphicsView(QWidget *parent) :
    QGraphicsView(parent)
{
    this->cenario = new QGraphicsScene(this);
}

---

btw. you should call base class implementation of the reimplemented event handlers.

Also need to insert the Q_OBJECT macro in the fluxoCaixaGraphicsView class definition:

Code:

---

class fluxoCaixaGraphicsView : public QGraphicsView
{
   Q_OBJECT
 
public:
  explicit fluxoCaixaGraphicsView(QWidget *parent = 0);
  ~fluxoCaixaGraphicsView();
 
// ...
};

---