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114 lines
4.1 KiB
114 lines
4.1 KiB
15 years ago
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/* This file is part of the KDE project
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Copyright (C) 2003 Ulrich Kuettler <ulrich.kuettler@gmx.de>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef CREATIONSTRATEGY_H
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#define CREATIONSTRATEGY_H
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#include <qstring.h>
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#include <qdom.h>
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#include "kformuladefs.h"
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KFORMULA_NAMESPACE_BEGIN
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class BasicElement;
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class BracketElement;
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class EmptyElement;
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class FractionElement;
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class IdentifierElement;
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class IndexElement;
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class MatrixElement;
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class MultilineElement;
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class NameSequence;
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class OperatorElement;
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class OverlineElement;
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class RootElement;
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class SpaceElement;
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class SymbolElement;
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class TextElement;
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class NumberElement;
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class UnderlineElement;
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/**
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* An object of this type needs to be known by the SequenceElement.
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* It decides what elements can be constructed.
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*/
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class ElementCreationStrategy {
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public:
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virtual ~ElementCreationStrategy() {}
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virtual BasicElement* createElement( QString type, const QDomElement& element ) = 0;
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/// there must always be a TextElement, so this can never return 0
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virtual TextElement* createTextElement( const QChar& ch, bool symbol=false ) = 0;
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/// when this gets called the user has seen the matrix dialog and expects a matrix!
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virtual MatrixElement* createMatrixElement( uint rows, uint columns ) = 0;
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virtual EmptyElement* createEmptyElement() = 0;
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virtual NameSequence* createNameSequence() = 0;
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virtual BracketElement* createBracketElement( SymbolType lhs, SymbolType rhs ) = 0;
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virtual OverlineElement* createOverlineElement() = 0;
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virtual UnderlineElement* createUnderlineElement() = 0;
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virtual MultilineElement* createMultilineElement() = 0;
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virtual SpaceElement* createSpaceElement( SpaceWidth width ) = 0;
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virtual FractionElement* createFractionElement() = 0;
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virtual RootElement* createRootElement() = 0;
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virtual SymbolElement* createSymbolElement( SymbolType type ) = 0;
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virtual IndexElement* createIndexElement() = 0;
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virtual IdentifierElement* createIdentifierElement() = 0;
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virtual OperatorElement* createOperatorElement() = 0;
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virtual NumberElement* createNumberElement() = 0;
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virtual QString type() const = 0;
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};
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/**
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* The ordinary strategy to be used for plain kformula.
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*/
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class OrdinaryCreationStrategy : public ElementCreationStrategy {
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public:
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virtual BasicElement* createElement( QString type, const QDomElement& element = 0 );
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virtual TextElement* createTextElement( const QChar& ch, bool symbol=false );
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virtual EmptyElement* createEmptyElement();
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virtual NameSequence* createNameSequence();
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virtual BracketElement* createBracketElement( SymbolType lhs, SymbolType rhs );
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virtual OverlineElement* createOverlineElement();
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virtual UnderlineElement* createUnderlineElement();
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virtual MultilineElement* createMultilineElement();
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virtual SpaceElement* createSpaceElement( SpaceWidth width );
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virtual FractionElement* createFractionElement();
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virtual RootElement* createRootElement();
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virtual SymbolElement* createSymbolElement( SymbolType type );
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virtual MatrixElement* createMatrixElement( uint rows, uint columns );
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virtual IndexElement* createIndexElement();
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virtual IdentifierElement* createIdentifierElement();
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virtual OperatorElement* createOperatorElement();
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virtual NumberElement* createNumberElement();
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virtual QString type() const { return "Ordinary"; }
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};
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KFORMULA_NAMESPACE_END
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#endif // CREATIONSTRATEGY_H
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