SafeGUIObjectPtr.h

/*
* Copyright (C) TES Electronic Solutions GmbH,
* All Rights Reserved.
* Contact: info@guiliani.de
*
* This file is part of the Guiliani HMI framework
* for the development of graphical user interfaces on embedded systems.
*/
 
#ifndef __SAFEGUIOBJECTPTR_H__
#define __SAFEGUIOBJECTPTR_H__
 
#include "eC_TList_doubleLinked.h"
 
class CGUIObject;
 
 
class CSafeGUIObjectPtr
{
public:
    CSafeGUIObjectPtr()
        : m_ptr(NULL)
    {
        // Add to list of all existing CSafeGUIObjectPtrs
        ms_kSafeGUIObjectPointerList.AddAtEnd(this);
    }
 
    CSafeGUIObjectPtr(CGUIObject* ptr)
        : m_ptr(ptr)
    {
        // Add to list of all existing CSafeGUIObjectPtrs
        ms_kSafeGUIObjectPointerList.AddAtEnd(this);
    }
 
    CSafeGUIObjectPtr(const CSafeGUIObjectPtr& ptr)
    {
        m_ptr = ptr.get();
        // Add to list of all existing CSafeGUIObjectPtrs
        ms_kSafeGUIObjectPointerList.AddAtEnd(this);
    }
 
    ~CSafeGUIObjectPtr()
    {
        Reset();
        ms_kSafeGUIObjectPointerList.Remove(this);
    }
 
    void Register()
    {
        // Add uniquely to list of all existing CSafeGUIObjectPtrs
        ms_kSafeGUIObjectPointerList.AddUniqueAtEnd(this);
    }
 
 
    CSafeGUIObjectPtr& operator = (const CSafeGUIObjectPtr& kSource)
    {
        m_ptr = kSource.m_ptr;
        return *this;
    }
 
    CSafeGUIObjectPtr& operator = (CGUIObject* pkSource)
    {
        m_ptr = pkSource;
        return *this;
    }
 
    operator CGUIObject* () const {return m_ptr;}
 
    CGUIObject& operator* () const {return *m_ptr;}
 
    CGUIObject* operator-> () const {return m_ptr;}
 
    CGUIObject* get() const {return m_ptr;}
 
    void Reset()
    {
        // Set internal CGUIObject pointer to NULL
        m_ptr = NULL;
    }
 
private:
    friend class CGUIObject; 
 
    static void NotifyOfDestruction(const CGUIObject* ptr);
 
    static eC_TListDoubleLinked< CSafeGUIObjectPtr*> ms_kSafeGUIObjectPointerList;
 
    CGUIObject* m_ptr;
};
 
 
#endif //__SAFEGUIOBJECTPTR_H__