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expression.h

/***************************************************************************
 *   Copyright (C) 2005  Tobi Vollebregt                                   *
 *   tobivollebregt@gmail.com                                              *
 *                                                                         *
 *   Copyright (C) 2005 by Joe Ferris                                      *
 *   jferris@optimistictech.com                                            *
 *                                                                         *
 *   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 EXPRESSION_H
#define EXPRESSION_H

#include <katapultitem.h>

class CalculatorCatalog;

/**
@author Tobi Vollebregt
*/
00033 class Expression : public KatapultItem
{
      Q_OBJECT
      public:
            Expression(CalculatorCatalog*, const QString&);

            virtual QPixmap icon(int) const;
            virtual QString text() const;

            void setText(const QString&);
            double result() const;
            bool parseError() const;

            //evaluate() must be const, or ActionEvaluateExpression::execute() can't call it.
            //It makes sense because evaluate() does _not_ change the expression,
            //it just calculates the result and remembers that.
            void evaluate(bool assignments = false) const;

            CalculatorCatalog* catalog() const;

      private:
            CalculatorCatalog* const _catalog;
            QString _text;
            mutable double _result;
            mutable bool _parseError;
};

#endif

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