koffice/lib/kformula/spaceelement.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>
   Copyright (C) 2006 Alfredo Beaumont Sainz <alfredo.beaumont@gmail.com>

   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 SPACEELEMENT_H
#define SPACEELEMENT_H

#include <tqfont.h>
#include <tqstring.h>

#include "basicelement.h"

class SymbolTable;


KFORMULA_NAMESPACE_BEGIN

/**
 * A element that represents a space.
 */
class SpaceElement : public BasicElement {
    enum LineBreakType {
        NoBreakType,
        AutoBreak,
        NewLineBreak,
        IndentingNewLineBreak,
        NoBreak,
        GoodBreak,
        BadBreak
    };
    SpaceElement operator=( const SpaceElement& ) { return *this; }
public:

    SpaceElement( SpaceWidth space = THIN, bool tab=false, BasicElement* parent = 0 );
    SpaceElement( const SpaceElement& );

    virtual SpaceElement* clone() {
        return new SpaceElement( *this );
    }

    virtual bool accept( ElementVisitor* visitor );

    /**
     * @returns the type of this element. Used for
     * parsing a sequence.
     */
    //virtual TokenType getTokenType() const;

    /**
     * @returns the character that represents this element. Used for
     * parsing a sequence.
     */
    virtual TQChar getCharacter() const { return ' '; }

    // drawing
    //
    // Drawing depends on a conspace which knows the required properties like
    // fonts, spaces and such.
    // It is essential to calculate elements size with the same conspace
    // before you draw.

    /**
     * Calculates our width and height and
     * our tqchildren's parentPosition.
     */
    virtual void calcSizes( const ContextStyle& cstyle,
						    ContextStyle::TextStyle tstyle,
						    ContextStyle::IndexStyle istyle,
							StyleAttributes& style );

    /**
     * Draws the whole element including its tqchildren.
     * The `parentOrigin' is the point this element's parent starts.
     * We can use our parentPosition to get our own origin then.
     */
    virtual void draw( TQPainter& painter, const LuPixelRect& r,
                       const ContextStyle& context,
                       ContextStyle::TextStyle tstyle,
                       ContextStyle::IndexStyle istyle,
					   StyleAttributes& style,
                       const LuPixelPoint& parentOrigin );

    /**
     * Moves the cursor away from the given child. The cursor is
     * guaranteed to be inside this element.
     */
    //virtual void childWillVanish(FormulaCursor*, BasicElement*) {}

    /**
     * @returns the latex representation of the element and
     * of the element's tqchildren
     */
    virtual TQString toLatex();

protected:

    //Save/load support

    /**
     * @returns the tag name of this element type.
     */
    virtual TQString getTagName() const { return "SPACE"; }

    /**
     * Appends our attributes to the dom element.
     */
    virtual void writeDom(TQDomElement element);

    /**
     * Reads our attributes from the element.
     * Returns false if it failed.
     */
    virtual bool readAttributesFromDom(TQDomElement element);

    /**
     * Reads our content from the node. Sets the node to the next node
     * that needs to be read.
     * Returns false if it failed.
     */
    virtual bool readContentFromDom(TQDomNode& node);

    /**
     * Reads our attributes from the MathML element.
     * Returns false if it failed.
     */
	virtual bool readAttributesFromMathMLDom(const TQDomElement& element);

private:

    virtual TQString getElementName() const { return "mspace"; }
    virtual void writeMathMLAttributes( TQDomElement& element ) const ;

    /**
     * Whether this space behaves like a tab.
     */
    bool m_tab;

    // MathML Attributes, Section 3.2.7.2
    SizeType m_widthType;
    double m_width;
    SizeType m_heightType;
    double m_height;
    SizeType m_depthType;
    double m_depth;
    LineBreakType m_lineBreak;
};

KFORMULA_NAMESPACE_END

#endif // SPACEELEMENT_H