    //------------------------------------------------------------------------------
    // emRecFileModel.h
    //
    // Copyright (C) 2005-2008,2010 Oliver Hamann.
    //
    // Homepage: http://eaglemode.sourceforge.net/
    //
    // This program is free software: you can redistribute it and/or modify it under
    // the terms of the GNU General Public License version 3 as published by the
    // Free Software Foundation.
    //
    // This program is distributed in the hope that it will be useful, but WITHOUT
    // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    // FOR A PARTICULAR PURPOSE. See the GNU General Public License version 3 for
    // more details.
    //
    // You should have received a copy of the GNU General Public License version 3
    // along with this program. If not, see <http://www.gnu.org/licenses/>.
    //------------------------------------------------------------------------------

    #ifndef emRecFileModel_h
    #define emRecFileModel_h

    #ifndef emRec_h
    #include <emCore/emRec.h>
    #endif

    #ifndef emFileModel_h
    #include <emCore/emFileModel.h>
    #endif

    //==============================================================================
    //=============================== emRecFileModel ===============================
    //==============================================================================

    class emRecFileModel : public emFileModel {

    public:

            // Base class for an emFileModel where the data is an emRec. This class
            // solves loading and saving of the record, and it provides a signal for
            // getting informed about modifications of the record. In addition, the
            // file state is automatically set to FS_UNSAVED on modifications. A
            // derived class has to specify the record through calling PostConstruct
            // from its constructor. Hint: There is a similar class which is not an
            // emFileModel and which could be used for configuration files:
            // emConfigModel.

            const emSignal & GetChangeSignal() const;
                    // Signaled on every modification of the record.

    protected:

            emRecFileModel(emContext & context, const emString & name);
                    // Do not forget to call PostConstruct from an overloaded
                    // constructor.

            void PostConstruct(emRec & rec);
                    // Must be called by the constructor of the derived class after
                    // the record has been constructed.

            virtual ~emRecFileModel();
                    // Destructor.

            emRec & GetRec();
                    // Not valid before PostConstruct has been called.

            virtual void ResetData();
            virtual void TryStartLoading() throw(emString);
            virtual bool TryContinueLoading() throw(emString);
            virtual void QuitLoading();
            virtual void TryStartSaving() throw(emString);
            virtual bool TryContinueSaving() throw(emString);
            virtual void QuitSaving();
            virtual emUInt64 CalcMemoryNeed();
            virtual double CalcFileProgress();

    private:

            class RecLink : public emRecListener {
            public:
                    RecLink(emRecFileModel & model);
            protected:
                    virtual void OnRecChanged();
            private:
                    emRecFileModel & Model;
            };
            friend class RecLink;

            emSignal ChangeSignal;
            RecLink Link;
            emRecFileReader * Reader;
            emRecFileWriter * Writer;
            int ProtectFileState;
            emUInt64 MemoryNeed;
            int MemoryNeedOutOfDate;
            int ReadStep, ReadStepOfMemCalc;
    };

    inline const emSignal & emRecFileModel::GetChangeSignal() const
    {
            return ChangeSignal;
    }

    inline emRec & emRecFileModel::GetRec()
    {
            return *Link.GetListenedRec();
    }

    #endif