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256 lines
7.8 KiB
256 lines
7.8 KiB
/* This file is part of the KDE project
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Copyright (C) 2001 Andrea Rizzi <rizzi@kde.org>
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Ulrich Kuettler <ulrich.kuettler@mailbox.tu-dresden.de>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef FRACTIONELEMENT_H
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#define FRACTIONELEMENT_H
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#include "basicelement.h"
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KFORMULA_NAMESPACE_BEGIN
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class SequenceElement;
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/**
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* A fraction.
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*/
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class FractionElement : public BasicElement {
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FractionElement& operator=( const FractionElement& ) { return *this; }
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public:
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enum { numeratorPos, denominatorPos };
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FractionElement(BasicElement* parent = 0);
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~FractionElement();
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FractionElement( const FractionElement& );
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virtual FractionElement* clone() {
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return new FractionElement( *this );
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}
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virtual bool accept( ElementVisitor* visitor );
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/**
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* @returns the type of this element. Used for
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* parsing a sequence.
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*/
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virtual TokenType getTokenType() const { return INNER; }
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/**
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* The cursor has entered one of our child sequences.
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* This is a good point to tell the user where he is.
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*/
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virtual void entered( SequenceElement* child );
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/**
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* Sets the cursor and returns the element the point is in.
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* The handled flag shows whether the cursor has been set.
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* This is needed because only the innermost matching element
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* is allowed to set the cursor.
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*/
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virtual BasicElement* goToPos( FormulaCursor*, bool& handled,
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const LuPixelPoint& point, const LuPixelPoint& parentOrigin );
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/**
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* Calculates our width and height and
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* our children's parentPosition.
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*/
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virtual void calcSizes( const ContextStyle& cstyle,
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ContextStyle::TextStyle tstyle,
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ContextStyle::IndexStyle istyle,
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StyleAttributes& style );
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/**
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* Draws the whole element including its children.
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* The `parentOrigin' is the point this element's parent starts.
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* We can use our parentPosition to get our own origin then.
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*/
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virtual void draw( TQPainter& painter, const LuPixelRect& r,
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const ContextStyle& cstyle,
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ContextStyle::TextStyle tstyle,
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ContextStyle::IndexStyle istyle,
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StyleAttributes& style,
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const LuPixelPoint& parentOrigin );
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/**
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* Dispatch this FontCommand to all our TextElement children.
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*/
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virtual void dispatchFontCommand( FontCommand* cmd );
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/**
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* Enters this element while moving to the left starting inside
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* the element `from'. Searches for a cursor position inside
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* this element or to the left of it.
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*/
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virtual void moveLeft(FormulaCursor* cursor, BasicElement* from);
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/**
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* Enters this element while moving to the right starting inside
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* the element `from'. Searches for a cursor position inside
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* this element or to the right of it.
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*/
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virtual void moveRight(FormulaCursor* cursor, BasicElement* from);
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/**
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* Enters this element while moving up starting inside
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* the element `from'. Searches for a cursor position inside
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* this element or above it.
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*/
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virtual void moveUp(FormulaCursor* cursor, BasicElement* from);
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/**
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* Enters this element while moving down starting inside
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* the element `from'. Searches for a cursor position inside
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* this element or below it.
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*/
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virtual void moveDown(FormulaCursor* cursor, BasicElement* from);
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/**
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* Reinserts the denominator if it has been removed.
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*/
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virtual void insert(FormulaCursor*, TQPtrList<BasicElement>&, Direction);
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/**
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* Removes all selected children and returns them. Places the
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* cursor to where the children have been.
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*
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* We remove ourselve if we are requested to remove our numerator.
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*
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* It is possible to remove the denominator. But after this we
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* are senseless and the caller is required to replace us.
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*/
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virtual void remove(FormulaCursor*, TQPtrList<BasicElement>&, Direction);
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// main child
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//
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// If an element has children one has to become the main one.
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virtual SequenceElement* getMainChild();
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SequenceElement* getNumerator() { return numerator; }
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SequenceElement* getDenominator() { return denominator; }
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/**
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* Returns wether the element has no more useful
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* children (except its main child) and should therefore
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* be replaced by its main child's content.
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*/
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virtual bool isSenseless();
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/**
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* Sets the cursor to select the child. The mark is placed before,
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* the position behind it.
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*/
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virtual void selectChild(FormulaCursor* cursor, BasicElement* child);
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/**
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* Moves the cursor away from the given child. The cursor is
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* guaranteed to be inside this element.
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*/
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//virtual void childWillVanish(FormulaCursor* cursor, BasicElement* child) = 0;
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/**
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* Tells whether the fraction should be drawn with a line.
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*/
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void showLine(bool line) {
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m_lineThicknessType = RelativeSize;
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if ( line ) {
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m_lineThickness = 1.0;
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}
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else {
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m_lineThickness = 0.0;
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}
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}
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/**
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* @returns the latex representation of the element and
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* of the element's children
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*/
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virtual TQString toLatex();
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virtual TQString formulaString();
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protected:
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//Save/load support
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/**
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* Returns the tag name of this element type.
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*/
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virtual TQString getTagName() const { return "FRACTION"; }
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/**
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* Appends our attributes to the dom element.
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*/
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virtual void writeDom(TQDomElement element);
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/**
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* Reads our attributes from the element.
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* Returns false if it failed.
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*/
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virtual bool readAttributesFromDom(TQDomElement element);
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/**
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* Reads our content from the node. Sets the node to the next node
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* that needs to be read.
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* Returns false if it failed.
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*/
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virtual bool readContentFromDom(TQDomNode& node);
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/**
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* Reads our attributes from the MathML element.
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* Returns false if it failed.
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*/
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virtual bool readAttributesFromMathMLDom(const TQDomElement& element);
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/**
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* Reads our content from the MathML node. Sets the node to the next node
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* that needs to be read.
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* Returns false if it failed.
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*/
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virtual int readContentFromMathMLDom(TQDomNode& node);
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private:
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virtual TQString getElementName() const { return "mfrac"; }
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virtual void writeMathMLAttributes( TQDomElement& element ) const ;
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virtual void writeMathMLContent( TQDomDocument& doc,
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TQDomElement& element,
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bool oasisFormat ) const ;
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double lineThickness( const ContextStyle& context, double factor );
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bool withLine() { return m_lineThicknessType == NoSize || m_lineThickness != 0.0; }
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SequenceElement* numerator;
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SequenceElement* denominator;
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SizeType m_lineThicknessType;
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double m_lineThickness;
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HorizontalAlign m_numAlign;
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HorizontalAlign m_denomAlign;
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bool m_customBevelled;
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bool m_bevelled;
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};
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KFORMULA_NAMESPACE_END
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#endif // FRACTIONELEMENT_H
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