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/* This file is part of the KDE project
Copyright (C) 2003 Ulrich Kuettler <ulrich.kuettler@gmx.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef CREATIONSTRATEGY_H
#define CREATIONSTRATEGY_H
#include <tqstring.h>
#include <tqdom.h>
#include "kformuladefs.h"
KFORMULA_NAMESPACE_BEGIN
class BasicElement;
class BracketElement;
class EmptyElement;
class FractionElement;
class IdentifierElement;
class IndexElement;
class MatrixElement;
class MultilineElement;
class NameSequence;
class OperatorElement;
class OverlineElement;
class RootElement;
class SpaceElement;
class SymbolElement;
class TextElement;
class NumberElement;
class UnderlineElement;
/**
* An object of this type needs to be known by the SequenceElement.
* It decides what elements can be constructed.
*/
class ElementCreationStrategy {
public:
virtual ~ElementCreationStrategy() {}
virtual BasicElement* createElement( TQString type, const TQDomElement& element ) = 0;
/// there must always be a TextElement, so this can never return 0
virtual TextElement* createTextElement( const TQChar& ch, bool symbol=false ) = 0;
/// when this gets called the user has seen the matrix dialog and expects a matrix!
virtual MatrixElement* createMatrixElement( uint rows, uint columns ) = 0;
virtual EmptyElement* createEmptyElement() = 0;
virtual NameSequence* createNameSequence() = 0;
virtual BracketElement* createBracketElement( SymbolType lhs, SymbolType rhs ) = 0;
virtual OverlineElement* createOverlineElement() = 0;
virtual UnderlineElement* createUnderlineElement() = 0;
virtual MultilineElement* createMultilineElement() = 0;
virtual SpaceElement* createSpaceElement( SpaceWidth width ) = 0;
virtual FractionElement* createFractionElement() = 0;
virtual RootElement* createRootElement() = 0;
virtual SymbolElement* createSymbolElement( SymbolType type ) = 0;
virtual IndexElement* createIndexElement() = 0;
virtual IdentifierElement* createIdentifierElement() = 0;
virtual OperatorElement* createOperatorElement() = 0;
virtual NumberElement* createNumberElement() = 0;
virtual TQString type() const = 0;
};
/**
* The ordinary strategy to be used for plain kformula.
*/
class OrdinaryCreationStrategy : public ElementCreationStrategy {
public:
virtual BasicElement* createElement( TQString type, const TQDomElement& element = 0 );
virtual TextElement* createTextElement( const TQChar& ch, bool symbol=false );
virtual EmptyElement* createEmptyElement();
virtual NameSequence* createNameSequence();
virtual BracketElement* createBracketElement( SymbolType lhs, SymbolType rhs );
virtual OverlineElement* createOverlineElement();
virtual UnderlineElement* createUnderlineElement();
virtual MultilineElement* createMultilineElement();
virtual SpaceElement* createSpaceElement( SpaceWidth width );
virtual FractionElement* createFractionElement();
virtual RootElement* createRootElement();
virtual SymbolElement* createSymbolElement( SymbolType type );
virtual MatrixElement* createMatrixElement( uint rows, uint columns );
virtual IndexElement* createIndexElement();
virtual IdentifierElement* createIdentifierElement();
virtual OperatorElement* createOperatorElement();
virtual NumberElement* createNumberElement();
virtual TQString type() const { return "Ordinary"; }
};
KFORMULA_NAMESPACE_END
#endif // CREATIONSTRATEGY_H
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