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koffice/lib/kformula/fractionelement.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 FRACTIONELEMENT_H
#define FRACTIONELEMENT_H
#include "basicelement.h"
KFORMULA_NAMESPACE_BEGIN
class SequenceElement;
/**
* A fraction.
*/
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 );
/**
* @returns the type of this element. Used for
* parsing a sequence.
*/
virtual TokenType getTokenType() const { return INNER; }
/**
* The cursor has entered one of our child sequences.
* This is a good point to tell the user where he is.
*/
virtual void entered( SequenceElement* child );
/**
* Sets the cursor and returns the element the point is in.
* The handled flag shows whether the cursor has been set.
* This is needed because only the innermost matching element
* is allowed to set the cursor.
*/
virtual BasicElement* goToPos( FormulaCursor*, bool& handled,
const LuPixelPoint& point, const LuPixelPoint& parentOrigin );
/**
* Calculates our width and height and
* our children's parentPosition.
*/
virtual void calcSizes( const ContextStyle& cstyle,
ContextStyle::TextStyle tstyle,
ContextStyle::IndexStyle istyle,
StyleAttributes& style );
/**
* Draws the whole element including its children.
* The `parentOrigin' is the point this element's parent starts.
* We can use our parentPosition to get our own origin then.
*/
virtual void draw( QPainter& painter, const LuPixelRect& r,
const ContextStyle& cstyle,
ContextStyle::TextStyle tstyle,
ContextStyle::IndexStyle istyle,
StyleAttributes& style,
const LuPixelPoint& parentOrigin );
/**
* Dispatch this FontCommand to all our TextElement children.
*/
virtual void dispatchFontCommand( FontCommand* cmd );
/**
* Enters this element while moving to the left starting inside
* the element `from'. Searches for a cursor position inside
* this element or to the left of it.
*/
virtual void moveLeft(FormulaCursor* cursor, BasicElement* from);
/**
* Enters this element while moving to the right starting inside
* the element `from'. Searches for a cursor position inside
* this element or to the right of it.
*/
virtual void moveRight(FormulaCursor* cursor, BasicElement* from);
/**
* Enters this element while moving up starting inside
* the element `from'. Searches for a cursor position inside
* this element or above it.
*/
virtual void moveUp(FormulaCursor* cursor, BasicElement* from);
/**
* Enters this element while moving down starting inside
* the element `from'. Searches for a cursor position inside
* this element or below it.
*/
virtual void moveDown(FormulaCursor* cursor, BasicElement* from);
/**
* Reinserts the denominator if it has been removed.
*/
virtual void insert(FormulaCursor*, QPtrList<BasicElement>&, Direction);
/**
* Removes all selected children and returns them. Places the
* cursor to where the children have been.
*
* We remove ourselve if we are requested to remove our numerator.
*
* It is possible to remove the denominator. But after this we
* are senseless and the caller is required to replace us.
*/
virtual void remove(FormulaCursor*, QPtrList<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; }
/**
* Returns wether the element has no more useful
* children (except its main child) and should therefore
* be replaced by its main child's content.
*/
virtual bool isSenseless();
/**
* Sets the cursor to select the child. The mark is placed before,
* the position behind it.
*/
virtual void selectChild(FormulaCursor* cursor, BasicElement* child);
/**
* Moves the cursor away from the given child. The cursor is
* guaranteed to be inside this element.
*/
//virtual void childWillVanish(FormulaCursor* cursor, BasicElement* child) = 0;
/**
* Tells whether the fraction should be drawn with a line.
*/
void showLine(bool line) {
m_lineThicknessType = RelativeSize;
if ( line ) {
m_lineThickness = 1.0;
}
else {
m_lineThickness = 0.0;
}
}
/**
* @returns the latex representation of the element and
* of the element's children
*/
virtual QString toLatex();
virtual QString formulaString();
protected:
//Save/load support
/**
* Returns the tag name of this element type.
*/
virtual QString getTagName() const { return "FRACTION"; }
/**
* Appends our attributes to the dom element.
*/
virtual void writeDom(QDomElement element);
/**
* Reads our attributes from the element.
* Returns false if it failed.
*/
virtual bool readAttributesFromDom(QDomElement 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(QDomNode& node);
/**
* Reads our attributes from the MathML element.
* Returns false if it failed.
*/
virtual bool readAttributesFromMathMLDom(const QDomElement& element);
/**
* Reads our content from the MathML node. Sets the node to the next node
* that needs to be read.
* Returns false if it failed.
*/
virtual int readContentFromMathMLDom(QDomNode& node);
private:
virtual QString getElementName() const { return "mfrac"; }
virtual void writeMathMLAttributes( QDomElement& element ) const ;
virtual void writeMathMLContent( QDomDocument& doc,
QDomElement& 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