/* AbiWord
 * Copyright (C) 1998 AbiSource, Inc.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * 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 for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  
 * 02111-1307, USA.
 */


#ifndef PX_CHANGERECORD_SPAN_H
#define PX_CHANGERECORD_SPAN_H

#include "ut_types.h"
#include "px_ChangeRecord.h"

class fd_Field;

// PX_ChangeRecord_Span describes an insertSpan or
// deleteSpan change made to the document.
// This description should be sufficient to allow undo to
// work and sufficient to allow the formatter to do a
// partial format and screen update (if appropriate).
// The change record must be free of pointers, since it
// represents what was done to the document -- and not
// how it was done (that is, not what was done to various
// intermediate data structures).  this also lets it be
// cached to disk (for autosave and maybe multi-session
// undo).
//
// m_position contains the absolute document position of
// the text span at the time the change was made.
// m_bufIndex,m_length describe the actual contents
// of the text span.


class ABI_EXPORT PX_ChangeRecord_Span : public PX_ChangeRecord
{
public:
	PX_ChangeRecord_Span(PXType type,
						 PT_DocPosition position,
						 PT_AttrPropIndex indexAP,
						 PT_BufIndex bufIndex,
						 UT_uint32 length,
						 PT_BlockOffset blockOffset,
                         fd_Field * pField);
	
	~PX_ChangeRecord_Span();

	virtual PX_ChangeRecord * reverse(void) const;

	UT_uint32				getLength(void) const;
	PT_BufIndex				getBufIndex(void) const;
	void					coalesce(const PX_ChangeRecord_Span * pcr);
	PT_BlockOffset			getBlockOffset(void) const;
	fd_Field *              getField(void) const {return m_pField;};
	void                      AdjustBlockOffset(PT_BlockOffset iBlk) const
	{ m_blockOffset = iBlk;}

#ifdef PT_TEST
	virtual void			__dump(FILE * fp) const;
#endif

protected:
	PT_BufIndex				m_bufIndex;	/* bufIndex to our text */
	UT_uint32				m_length;	/* length of our text */
mutable	PT_BlockOffset			m_blockOffset; /* offset of span from beginning of paragraph */
    fd_Field *              m_pField;
};

#endif /* PX_CHANGERECORD_SPAN_H */