F:/KPlato/koffice/libs/kformula/FormulaElement.h

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/* 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 FORMULAELEMENT_H
#define FORMULAELEMENT_H

#include "SequenceElement.h"
#include <QKeyEvent>

namespace KFormula {

class BasicElement;
class ContextStyle;
class SymbolTable;


class FormulaElement : public BasicElement {
public:
    FormulaElement();

    ~FormulaElement();
    
    const QList<BasicElement*> childElements();

    void readMathML( const QDomElement& element );
    
    void writeMathML( KoXmlWriter* writer, bool oasisFormat = false );






    void addChild( BasicElement* element );
    void deleteChild( BasicElement* element );
    // void insertChild( int position, BasicElement* element );

    virtual bool readOnly( const BasicElement* /*child*/ ) const { return false; }

    virtual bool readOnly( const FormulaCursor* ) const { return false; }

    virtual FormulaElement* formula() { return this; }

    virtual const FormulaElement* formula() const { return this; }

    void elementRemoval(BasicElement* child);

    virtual void changed();

    void cursorHasMoved( FormulaCursor* );

    void moveOutLeft( FormulaCursor* );
    void moveOutRight( FormulaCursor* );
    void moveOutBelow( FormulaCursor* );
    void moveOutAbove( FormulaCursor* );

//    void tell( const QString& msg );

    void removeFormula( FormulaCursor* );

    void insertFormula( FormulaCursor* );

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

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

    void calcSizes( ContextStyle& context );

    void draw( QPainter& painter, const LuPixelRect& r, ContextStyle& context );

//    virtual KCommand* buildCommand( Container*, Request* );

    //const SymbolTable& getSymbolTable() const;

    int getBaseSize() const { return baseSize; }
    void setBaseSize( int size );

    bool hasOwnBaseSize() const { return ownBaseSize; }

//    virtual KCommand* input( Container* container, QKeyEvent* event );

 
    virtual void writeDom(QDomElement element);

    QDomElement emptyFormulaElement( QDomDocument& doc );

protected:
    //Save/load support

    virtual QString getTagName() const { return "FORMULA"; }

    virtual bool readAttributesFromDom(QDomElement element);

    virtual bool readContentFromDom(QDomNode& node);


private:
    QList<BasicElement*> m_childElements;

    void convertNames( QDomNode node );

    int baseSize;

    bool ownBaseSize;
};

} // namespace KFormula

#endif // FORMULAELEMENT_H

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