How define an interface for a Qt object

[hubbobubbo]

Ok so I changed so only the interface derived from QObject and the class inherit from the interface, like below. However I am not sure how to handle the passing of the parent object to the base class. I guess without this I will loose the memory managment, or? See comment in the source file below:

#include <QObject>

class ICallHandler : public QObject
{
public:
virtual ~ICallHandler(){};

public slots:
virtual void onIncomingCall() = 0;
};

and for the class implementing the interface:

#include <QObject>

class CallHandler : public ICallHandler
{
Q_OBJECT

public:
CallHandler(QObject *parent);
~CallHandler();
public slots:
void onIncomingCall();
};

and for the source file:

#include "callhandler.h"

CallHandler::CallHandler(QObject *parent)
: ICallHandler() //How handle the parent object here?
{

}

CallHandler::~CallHandler()
{

}

void CallHandler:nIncomingCall()
{}

[smacchia]

Make ICallHandler have a protected ctor which takes a QObject* as a parameter. Then in the ctor of CallHandler, pass the parent. For example:

class ICallHandler : public QObject
{
public:
    virtual ~ICallHandler(){};
 
public slots:
    virtual void onIncomingCall() = 0;
 
protected:
    ICallHandler(QObject *parent = NULL) : QObject(parent) {}
};

class ICallHandler : public QObject
{
public:
    virtual ~ICallHandler(){};

public slots:
    virtual void onIncomingCall() = 0;

protected:
    ICallHandler(QObject *parent = NULL) : QObject(parent) {}
};

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Then in the CallHandler ctor:

CallHandler::CallHandler(QObject *parent)
  : 
    ICallHandler(parent)
{
}

CallHandler::CallHandler(QObject *parent)
  : 
    ICallHandler(parent)
{
}

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[vince]

Is it possible to not have dependencies to Qt in the interface?

For me the ICallHandler interface shall be independent of the UI.

[wysota]

Is it possible to not have dependencies to Qt in the interface?

For me the ICallHandler interface shall be independent of the UI.

If you don't use any Qt API in the interface then it will be independent of Qt.

[anda_skoa]

Also QObject is a class of QtCore so it does not have any dependency on UI even when being used.

Cheers,
_