Qt C++ inner class access to outer class - c++

Question

I have a question again:
I have a class PBV t(inherits from Tab) hat has a class Geometry. Geometry is the parent of Geo_1. From Geo_1 I want to have access to methods of PBV ( e.g. printContent . How do I do that? I am able to create Signal-Slots but since I have to use methods of PBV often that would make lots of Signal-Slots.
Here is my code:
PBV.h:
#include "../Geometry/Geo_1.h"
class PBV : public Tab
{
Q_OBJECT
public:
explicit PBV (QWidget *parent = 0);
~ PBV ();
virtual void printContent( QStringList *const qsl);
private:
Geo_1 *GEO_1;
Geometry *GEO;
}
PBV.cpp:
…
Geo_1 *GEO_1;
GEO_1 = new Geo_1(this);
GEO_1->set_LNE_default();
…
.
Geo_1.h:
#ifndef GEO_1_H
#define GEO_1_H
#include "Geometry.h"
#include "../Tabs/PBV.h"
class Geo_1: public Geometry
{
Q_OBJECT
public:
Geo_1 (QObject *_parent = 0);
virtual void set_LNE_default();
};
#endif // GEO_1_H
.
Geo_1.cpp:
#include "Geometry.h"
#include <QDebug>
#include "Geo_1.h"
#include "../Tabs/PBV.h"
Geo_1::Geo_1(QObject*_parent)
: Geometry(_parent) {}
void Geo_1::set_LNE_default()
{
// here I want to use printContent
}
.
Geometry.h:
#ifndef GEOMETRY_H
#define GEOMETRY_H
#include <QObject>
class Geometry : public QObject
{
Q_OBJECT
public:
Geometry(QObject *_parent=0);
~Geometry();
virtual void set_LNE_default();
};
#endif // GEOMETRY_H
.
Geometry.cpp:
#include "Geometry.h"
#include <QDebug>
Geometry::Geometry(QObject *_parent)
: QObject(_parent) {}
Geometry::~Geometry(){}
void Geometry::set_LNE_default() { }

Answer 1

One approach, as referred to by comments, is to keep track of the parent class in the constructor of the child:
In Geometry.h, add a private member variable:
private:
PBV* m_pParentPBV;
Then, in the constructor in Geometry.cpp, set this to the parent you are already passing:
Geometry::Geometry(QObject *_parent)
: QObject(_parent)
{
m_pParentPBV = dynamic_cast<PBV*>(_parent);
}
Now you can call methods on the parent using m_pParentPBV->printContent() etc.