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124 lines
2.9 KiB
C++
124 lines
2.9 KiB
C++
/*
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* ProjectJournal.h - declaration of class ProjectJournal
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*
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* Copyright (c) 2006-2010 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef PROJECT_JOURNAL_H
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#define PROJECT_JOURNAL_H
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#include <QtCore/QHash>
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#include <QtCore/QStack>
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#include "lmms_basics.h"
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#include "DataFile.h"
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class JournallingObject;
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//! @warning many parts of this class may be rewritten soon
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class ProjectJournal
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{
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public:
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static const int MAX_UNDO_STATES;
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ProjectJournal();
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virtual ~ProjectJournal();
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void undo();
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void redo();
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bool canUndo() const;
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bool canRedo() const;
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void addJournalCheckPoint( JournallingObject *jo );
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bool isJournalling() const
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{
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return m_journalling;
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}
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void setJournalling( const bool _on )
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{
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m_journalling = _on;
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}
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// alloc new ID and register object _obj to it
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jo_id_t allocID( JournallingObject * _obj );
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// if there's already something known about ID _id, but it is currently
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// unused (e.g. after jouralling object was deleted), register object
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// _obj to this id
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void reallocID( const jo_id_t _id, JournallingObject * _obj );
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// make ID _id unused, but keep all global journalling information
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// (order of journalling entries etc.) referring to _id - needed for
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// restoring a journalling object later
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void freeID( const jo_id_t _id )
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{
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reallocID( _id, NULL );
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}
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//! hack, not used when saving a file
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static jo_id_t idToSave( jo_id_t id );
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//! hack, not used when loading a savefile
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static jo_id_t idFromSave( jo_id_t id );
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void clearJournal();
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void stopAllJournalling();
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JournallingObject * journallingObject( const jo_id_t _id )
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{
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if( m_joIDs.contains( _id ) )
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{
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return m_joIDs[_id];
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}
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return NULL;
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}
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private:
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typedef QHash<jo_id_t, JournallingObject *> JoIdMap;
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struct CheckPoint
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{
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CheckPoint( jo_id_t initID = 0, const DataFile& initData = DataFile( DataFile::JournalData ) ) :
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joID( initID ),
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data( initData )
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{
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}
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jo_id_t joID;
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DataFile data;
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} ;
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typedef QStack<CheckPoint> CheckPointStack;
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JoIdMap m_joIDs;
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CheckPointStack m_undoCheckPoints;
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CheckPointStack m_redoCheckPoints;
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bool m_journalling;
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} ;
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#endif
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