// -*- C++ -*-
/**
 * \file texrow.h
 * Copyright 1995-2002 the LyX Team
 * Read the file COPYING
 *
 * \author Matthias Ettrich
 */


#ifndef TEXROW_H
#define TEXROW_H

#ifdef __GNUG__
#pragma interface
#endif

#include <list>

class Paragraph;

/// Represents the correspondence between paragraphs and the generated LaTeX file
class TexRow {
public:
	///
	TexRow() : count(0), lastpar(0), lastpos(-1) {}

	/// Clears structure
	void reset();

	/// Define what paragraph and position the next row will represent
	void start(Paragraph * par, int pos);

	/// Insert node when line is completed
	void newline();

	/**
	 * getIdFromRow - find pid and position for a given row
	 * @param row row number to find
	 * @param id set to id if found
	 * @param pos set to paragraph position if found
	 * @return true if found, false otherwise
	 *
	 * If the row could not be found, pos is set to zero and
	 * id is set to -1
	 */
	bool getIdFromRow(int row, int & id, int & pos) const;

	TexRow & operator+= (TexRow const &);

	/// Returns the number of rows contained
	int rows() const { return count; }

	/// an individual id/pos <=> row mapping
	class RowItem {
	public:
		RowItem(int id, int pos, int row) 
			: id_(id), pos_(pos), rownumber_(row)
		{}

		/// paragraph id
		int id() const {
			return id_;
		}
 
		/// set paragraph position
		void pos(int p) {
			pos_ = p;
		}

		/// paragraph position
		int pos() const {
			return pos_;
		}

		/// row number
		int rownumber() const {
			return rownumber_;
		}
	private:
		int id_;
		int pos_;
		int rownumber_;
	};
	///
	typedef std::list<RowItem> RowList;
	/// increment position of all other RowItems
	/// with same par id, to avoid placing error insets
	/// at the same position
	void increasePos(int id, int pos);
private:
	/// number of lines
	unsigned int count;
	/// container of id/pos <=> row mapping
	RowList rowlist;
	/// Last paragraph
	Paragraph * lastpar;
	/// Last position
	int lastpos;
};
 
#endif // TEXROW_H