QObject class with QObject class

justin1122

I have a QObject class (Main) that has one int member and one string member. The other private member is a class that is also derived from Q_Object (Second). I am having trouble compiling the Main class due to errors related to "synthesized method 'Second::Second(const Second&)' first required here' and such.

The errors are due to that fact that I cannot copy Q_Object derived classes, but I don't know how to get around this. I thought that my code below is already using pointers to the "Second" QObject class.

What I'm trying to do is to make a QML widget that has two regular int/string fields plus a QListModel

Below is my code:

Main.h

@
#ifndef MAIN_H
#define MAIN_H

#include <QObject>
#include "second.h"

class Main : public QObject
{
Q_OBJECT

Q_PROPERTY(int num READ num WRITE setnum NOTIFY numChanged)
Q_PROPERTY(QString name READ name WRITE setname NOTIFY nameChanged)
Q_PROPERTY(Second second READ second WRITE second NOTIFY secondChanged)

public:
Main(QObject *parent=0);
Main(const int &num, const QString &name, const Second &second, QObject *parent=0);

int num() const;
void setnum(const int &num);

QString name() const;
void setname(const QString &name);

Second second() const;
void setsecond(const Second &second);

signals:
void numChanged();
void nameChanged();
void secondChanged();

private:
int m_num;
QString m_name;
Second m_second;

};

#endif // MAIN_H
@

Main.cpp

@
Main::Main(QObject *parent) :
QObject(parent)
{
}

Main::Main(const int &num, const QString &name, const Second &second, QObject *parent)
: QObject(parent), m_num(num), m_name(name), m_second(second)
{
}

int Recipe::num() const
{
return m_num;
}

void Main::setnum(const int &num)
{
if (num != m_num) {
m_num = num;
emit numChanged();
}
}

QString Main::name() const
{
return m_name;
}

void Main::setname(const QString &name)
{
if (name != m_name) {
m_name = name;
emit nameChanged();
}
}

Second Main::second() const
{
return &m_second;
}

void Main::setsecond(const Second &second)
{
if (second != m_second) {
m_second = second;
emit secondChanged();
/ }
}@

CKurdu

You must use pointer for QObjects.
in main.h
for example
@
line 13 : Q_PROPERTY(Second* second READ second WRITE setsecond NOTIFY secondChanged)

line 36 : Second * m_second;

//main.cpp
Second* Main::second() const
{
return m_second;
}

void Main::setsecond(Second *second)
{
if (second != m_second) {
m_second = second;
emit secondChanged();
/ }
}
@

justin1122

Cheers mate! Worked liked a charm!

SGaist

Hi,

To add to CKurdu, QObject and QObject derived class are not copyable. That's why it didn't work. On a side note, don't forget to handle the lifetime of m_second properly.