/*                                                                              
 * PDFedit - free program for PDF document manipulation.                        
 * Copyright (C) 2006, 2007  PDFedit team:      Michal Hocko, 
 *                                              Miroslav Jahoda,       
 *                                              Jozef Misutka, 
 *                                              Martin Petricek                                             
 *
 * Project is hosted on http://sourceforge.net/projects/pdfedit                                                                      
 */ 
#ifndef __QSPDFOPERATORITERATOR_H__
#define __QSPDFOPERATORITERATOR_H__

#include <qstring.h>
#include <qobject.h>
#include <pdfoperators.h>
#include <ccontentstream.h>
#include "qscobject.h"

namespace gui {

class QSContentStream;
class QSPdfOperator;

using namespace pdfobjects;

/*= This type of object represents pdf operator in content stream */
/** \brief QObject wrapper around PdfOperator::Iterator */
class QSPdfOperatorIterator : public QSCObject {
 Q_OBJECT
public:
 QSPdfOperatorIterator(PdfOperator::Iterator *op,boost::shared_ptr<CContentStream> cs,BaseCore *_base);
 QSPdfOperatorIterator(boost::shared_ptr<PdfOperator> op,BaseCore *_base);
 QSPdfOperatorIterator(boost::shared_ptr<PdfOperator> op,boost::shared_ptr<CContentStream> cs,BaseCore *_base);
 virtual ~QSPdfOperatorIterator();
 PdfOperator::Iterator* get();
 boost::shared_ptr<PdfOperator> getCurrent();
public slots:
 /*- Returns current operator from this iterator, or NULL if the iterator is at invalid position (after end, before beginning) */
 QSPdfOperator* current();
 /*- Create and return copy of this iterator, initially pointing to the same item */
 QSPdfOperatorIterator* copy();
 /*-
  Move the iterator to next operator.
  Return reference to itself, or NULL, if we are after last valid item
 */
 QSPdfOperatorIterator* next();
 /*-
  Move the iterator to previous operator
  Return reference to itself, or NULL, if we are before first valid item
 */
 QSPdfOperatorIterator* prev();
 /*-
  Return content stream in which the initial operator used to construct the iterator was contained.
  May return NULL, if operator is not contained in any content stream or if content stream is not known at time of creation
 */
 QSContentStream* stream();
 /*-
  Return true, if we are at the end of the operator list
  (this means after last valid item, so calling current() will return NULL )
 */
 bool isEnd();
 /*-
  Return true, if we are at the beginning of the operator list
  (this means before first valid item, so calling current() will return NULL )
 */
 bool isBegin();
 /*-
  Return true, if current position is valid (not before beginning or after end of list)
  (calling current() will return valid item, not NULL)
 */
 bool valid();
protected:
 PdfOperator::Iterator* copyIterator(PdfOperator::Iterator *src);
 void csCheck();
private:
 /** Object held in class*/
 PdfOperator::Iterator *obj;
 /** Reference to content stream that is holding the original operator used to construct the iterator. It may be NULL (empty shared_ptr) if unknown or empty */
 boost::shared_ptr<CContentStream> csRef;
};

} // namespace gui

#endif