fractionelement.h

/* This file is part of the KDE project
   Copyright (C) 2001 Andrea Rizzi <rizzi@kde.org>
                  Ulrich Kuettler <ulrich.kuettler@mailbox.tu-dresden.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 FRACTIONELEMENT_H
#define FRACTIONELEMENT_H
 
#include "basicelement.h"
 
KFORMULA_NAMESPACE_BEGIN
class SequenceElement;
 

class FractionElement : public BasicElement {
    FractionElement& operator=( const FractionElement& ) { return *this; }
public:
 
    enum { numeratorPos, denominatorPos };
 
    FractionElement(BasicElement* parent = 0);
    ~FractionElement();
 
    FractionElement( const FractionElement& );
 
    virtual FractionElement* clone() {
        return new FractionElement( *this );
    }
 
    virtual bool accept( ElementVisitor* visitor );

    virtual TokenType getTokenType() const { return INNER; }

    virtual void entered( SequenceElement* child );

    virtual BasicElement* goToPos( FormulaCursor*, bool& handled,
                                   const LuPixelPoint& point, const LuPixelPoint& parentOrigin );

    virtual void calcSizes( const ContextStyle& cstyle,
                            ContextStyle::TextStyle tstyle,
                            ContextStyle::IndexStyle istyle,
                            StyleAttributes& style );

    virtual void draw( TQPainter& painter, const LuPixelRect& r,
                       const ContextStyle& cstyle,
                       ContextStyle::TextStyle tstyle,
                       ContextStyle::IndexStyle istyle,
                       StyleAttributes& style,
                       const LuPixelPoint& parentOrigin );

    virtual void dispatchFontCommand( FontCommand* cmd );

    virtual void moveLeft(FormulaCursor* cursor, BasicElement* from);

    virtual void moveRight(FormulaCursor* cursor, BasicElement* from);

    virtual void moveUp(FormulaCursor* cursor, BasicElement* from);

    virtual void moveDown(FormulaCursor* cursor, BasicElement* from);

    virtual void insert(FormulaCursor*, TQPtrList<BasicElement>&, Direction);

    virtual void remove(FormulaCursor*, TQPtrList<BasicElement>&, Direction);
 
 
    // main child
    //
    // If an element has children one has to become the main one.
 
    virtual SequenceElement* getMainChild();
 
    SequenceElement* getNumerator() { return numerator; }
    SequenceElement* getDenominator() { return denominator; }

    virtual bool isSenseless();

    virtual void selectChild(FormulaCursor* cursor, BasicElement* child);

    //virtual void childWillVanish(FormulaCursor* cursor, BasicElement* child) = 0;

    void showLine(bool line) { 
        m_lineThicknessType = RelativeSize;
        if ( line ) {
            m_lineThickness = 1.0;
        }
        else {
            m_lineThickness = 0.0;
        }
    }

    virtual TQString toLatex();
 
    virtual TQString formulaString();
 
protected:
 
    //Save/load support

    virtual TQString getTagName() const { return "FRACTION"; }

    virtual void writeDom(TQDomElement element);

    virtual bool readAttributesFromDom(TQDomElement element);

    virtual bool readContentFromDom(TQDomNode& node);

    virtual bool readAttributesFromMathMLDom(const TQDomElement& element);

    virtual int readContentFromMathMLDom(TQDomNode& node);
 
private:
    virtual TQString getElementName() const { return "mfrac"; }
    virtual void writeMathMLAttributes( TQDomElement& element ) const ;
    virtual void writeMathMLContent( TQDomDocument& doc, 
                                     TQDomElement& element,
                                     bool oasisFormat ) const ;
 
    double lineThickness( const ContextStyle& context, double factor );
 
    bool withLine() { return m_lineThicknessType == NoSize || m_lineThickness != 0.0; }
 
    SequenceElement* numerator;
    SequenceElement* denominator;
 
    SizeType m_lineThicknessType;
    double m_lineThickness;
    HorizontalAlign m_numAlign;
    HorizontalAlign m_denomAlign;
    bool m_customBevelled;
    bool m_bevelled;
};
 
KFORMULA_NAMESPACE_END
 
#endif // FRACTIONELEMENT_H