rootelement.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 ROOTELEMENT_H
#define ROOTELEMENT_H
 
#include <tqpoint.h>
 
#include "basicelement.h"
 
KFORMULA_NAMESPACE_BEGIN
class SequenceElement;
 

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

    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);

    virtual void normalize(FormulaCursor*, Direction);
 
    // main child
    //
    // If an element has children one has to become the main one.
 
    virtual SequenceElement* getMainChild();
    SequenceElement* getRadiant() { return index; }
    //virtual void setMainChild(SequenceElement*);

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

    //virtual void childWillVanish(FormulaCursor* cursor, BasicElement* child) = 0;
 
    // Moves the cursor inside the index. The index has to exist.
    void moveToIndex(FormulaCursor*, Direction);
 
    // Sets the cursor to point to the place where the index normaly
    // is. These functions are only used if there is no such index and
    // we want to insert them.
    void setToIndex(FormulaCursor*);
 
    bool hasIndex() const { return index != 0; }
 
    ElementIndexPtr getIndex() { return ElementIndexPtr( new RootElementIndex( this ) ); }
 
    // Save&load
    //virtual TQDomElement getElementDom(TQDomDocument *doc);
    //virtual bool buildFromDom(TQDomElement *elem);

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

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

    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 hasIndex() ? "mroot" : "msqrt"; }
    virtual void writeMathMLContent( TQDomDocument& doc, 
                                     TQDomElement& element,
                                     bool oasisFormat ) const ;
 
    class RootElementIndex : public ElementIndex {
    public:
        RootElementIndex(RootElement* p) : parent(p) {}
        virtual void moveToIndex(FormulaCursor* cursor, Direction direction)
            { parent->moveToIndex(cursor, direction); }
        virtual void setToIndex(FormulaCursor* cursor)
            { parent->setToIndex(cursor); }
        virtual bool hasIndex() const
            { return parent->hasIndex(); }
        virtual RootElement* getElement() { return parent; }
    protected:
        RootElement* parent;
    };
 

    SequenceElement* content;

    SequenceElement* index;

    LuPixelPoint rootOffset;

    bool square;
};
 
 
KFORMULA_NAMESPACE_END
 
#endif // ROOTELEMENT_H