CModelProxy.h

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/********************************************************************************
**  This file is part of the ICF Framework. Copyright (C) Witold Gantzke & Kirill Lepskiy
**  ICF Framework may be used under the terms of the LGPL License v. 2.1 by the Free Software Foundation.
********************************************************************************/
 
#ifndef imod_CModelProxy_included
#define imod_CModelProxy_included
 
 
// Qt includes
#include <QtCore/QVector>
 
// ICF includes
#include <imod/IModel.h>
#include <imod/TSingleModelObserverBase.h>
 
 
namespace imod
{
 
 
class CModelProxy: virtual public imod::IModel
{
public:
    CModelProxy();
 
    void SetModelPtr(imod::IModel* modelPtr);
    void ResetModel();
 
    // reimplemented (imod::IModel)
    virtual bool AttachObserver(IObserver* observerPtr);
    virtual void DetachObserver(IObserver* observerPtr);
    virtual void DetachAllObservers();
    virtual bool IsAttached(const IObserver* observerPtr) const;
 
private:
    void AttachProxyObservers();
    void DetachProxyObservers();
 
private:
    class ModelObserver: public imod::TSingleModelObserverBase<imod::IModel>
    {
    public:
        typedef imod::TSingleModelObserverBase<imod::IModel> BaseClass;
 
        explicit ModelObserver(CModelProxy& parent);
 
        // reimplemented (imod::IObserver)
        virtual bool OnModelDetached(imod::IModel* modelPtr);
 
    private:
        CModelProxy& m_parent;
    };
 
    struct PendingObserver
    {
        PendingObserver(imod::IObserver* observerPtr = nullptr, bool isPending = false)
            :m_observerPtr(observerPtr), 
            m_isPending(isPending)
        {
        }
 
        bool operator == (const imod::IObserver* observerPtr) const
        {
            return (observerPtr == m_observerPtr);
        }
 
        imod::IObserver* m_observerPtr;
        bool m_isPending;
    };
 
    typedef PendingObserver Observer;
    typedef QVector<Observer> Observers;
 
    Observers m_proxyObservers;
    ModelObserver m_modelObserver;
    imod::IModel* m_modelPtr;
};
 
 
} // namespace imod
 
 
#endif // !imod_CModelProxy_included