textelement.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 TEXTELEMENT_H
#define TEXTELEMENT_H
 
#include <tqfont.h>
#include <tqstring.h>
 
#include "basicelement.h"
 
class SymbolTable;
 
 
KFORMULA_NAMESPACE_BEGIN

class TextElement : public BasicElement {
    TextElement operator=( const TextElement& ) { return *this; }
public:
 
    TextElement(TQChar ch = ' ', bool beSymbol = false, BasicElement* parent = 0);
    TextElement( const TextElement& );
 
    virtual TextElement* clone() {
        return new TextElement( *this );
    }
 
    virtual bool accept( ElementVisitor* visitor );

    virtual TokenType getTokenType() const;

    virtual bool isInvisible() const;

    virtual TQChar getCharacter() const { return character; }
 
    // drawing
    //
    // Drawing depends on a context which knows the required properties like
    // fonts, spaces and such.
    // It is essential to calculate elements size with the same context
    // before you draw.

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

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

    virtual void dispatchFontCommand( FontCommand* cmd );

    void setColor( TQColor c ) { color = c; }
 
    CharStyle getCharStyle() const { return charStyle(); }
    void setCharStyle( CharStyle cs );
 
    CharFamily getCharFamily() const { return charFamily(); }
    void setCharFamily( CharFamily cf );
 
    char format() const { return m_format; }

    //virtual void childWillVanish(FormulaCursor*, BasicElement*) {}

    bool isSymbol() const { return symbol; }

    virtual TQString toLatex();
 
    virtual TQString formulaString();
 
    virtual void writeMathML( TQDomDocument& doc, TQDomNode& parent, bool oasisFormat = false ) const ;
 
protected:
 
    //Save/load support

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

    virtual void writeDom(TQDomElement element);

    virtual bool readAttributesFromDom(TQDomElement element);

    virtual bool readContentFromDom(TQDomNode& node);

    TQChar getRealCharacter(const ContextStyle& context);

    TQFont getFont(const ContextStyle& context, const StyleAttributes& style);

    void setUpPainter(const ContextStyle& context, TQPainter& painter);
 
    const SymbolTable& getSymbolTable() const;
 
private:

    TQChar character;

    bool symbol;

    TQColor color;

    CharStyle charStyle() const { return static_cast<CharStyle>( m_format & 0x0f ); }
    void charStyle( CharStyle cs )
        { m_format = ( m_format & 0xf0 ) | static_cast<char>( cs ); }

    CharFamily charFamily() const
        { return static_cast<CharFamily>( m_format >> 4 ); }
    void charFamily( CharFamily cf )
        { m_format = ( m_format & 0x0f ) | ( static_cast<char>( cf ) << 4 ); }

    char m_format;
};
 

class EmptyElement : public BasicElement {
    EmptyElement& operator=( const EmptyElement& ) { return *this; }
public:
 
    EmptyElement( BasicElement* parent = 0 );
    EmptyElement( const EmptyElement& );
 
    virtual EmptyElement* clone() {
        return new EmptyElement( *this );
    }
 
    virtual bool accept( ElementVisitor* visitor );

    virtual TQChar getCharacter() const { return 'A'; }

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

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

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

    virtual TQString getTagName() const { return "EMPTY"; }
 
};
 
 
KFORMULA_NAMESPACE_END
 
#endif // TEXTELEMENT_H