F:/KPlato/koffice/libs/kformula/TextElement.cpp

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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>
                 2006 Martin Pfeiffer <hubipete@gmx.net>

   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.
*/

#include "TextElement.h"


#include <QFontMetrics>
#include <QPainter>

#include <kdebug.h>

#include "BasicElement.h"
#include "contextstyle.h"
#include "fontstyle.h"
#include "FormulaElement.h"
#include "kformulacommand.h"
#include "SequenceElement.h"
#include "symboltable.h"


namespace KFormula {

TextElement::TextElement( BasicElement* parent ) : BasicElement(parent),
                                                   character(' '),
                                                   symbol(false)
{
    charStyle( anyChar );
    charFamily( anyFamily );
}

const QList<BasicElement*> TextElement::childElements()
{
    return QList<BasicElement*>();
}

void TextElement::readMathML( const QDomElement& element )
{
}

void TextElement::writeMathML( KoXmlWriter* writer, bool oasisFormat )
{
}


TokenType TextElement::getTokenType() const
{
    if ( isSymbol() ) {
        return getSymbolTable().charClass( character );
    }

    switch ( character.unicode() ) {
    case '+':
    case '-':
    case '*':
        //case '/':  because it counts as text -- no extra spaces
        return BINOP;
    case '=':
    case '<':
    case '>':
        return RELATION;
    case ',':
    case ';':
    case ':':
        return PUNCTUATION;
    case '\\':
        return SEPARATOR;
    case '\0':
        return ELEMENT;
    default:
        if ( character.isNumber() ) {
            return NUMBER;
        }
        else {
            return ORDINARY;
        }
    }
}



bool TextElement::isInvisible() const
{
    /*if (getElementType() != 0) {
        return getElementType()->isInvisible(*this);
    }*/
    // no longer needed as BasicElement implements this
    return false;
}


void TextElement::calcSizes(const ContextStyle& context, ContextStyle::TextStyle tstyle, ContextStyle::IndexStyle /*istyle*/)
{
    luPt mySize = context.getAdjustedSize( tstyle );
    //kDebug( DEBUGID ) << "TextElement::calcSizes size=" << mySize << endl;

    QFont font = getFont( context );
    font.setPointSizeF( context.layoutUnitPtToPt( mySize ) );

    QFontMetrics fm( font );
    QChar ch = getRealCharacter(context);
    if ( ch != QChar::Null ) {
        QRect bound = fm.boundingRect( ch );
        setWidth( context.ptToLayoutUnitPt( fm.width( ch ) ) );
        setHeight( context.ptToLayoutUnitPt( bound.height() ) );
        setBaseline( context.ptToLayoutUnitPt( -bound.top() ) );

        // There are some glyphs in TeX that have
        // baseline==0. (\int, \sum, \prod)
        if ( getBaseline() == 0 ) {
            //setBaseline( getHeight()/2 + context.axisHeight( tstyle ) );
            setBaseline( -1 );
        }
    }
    else {
        setWidth( qRound( context.getEmptyRectWidth() * 2./3. ) );
        setHeight( qRound( context.getEmptyRectHeight() * 2./3. ) );
        setBaseline( getHeight() );
    }

    //kDebug( DEBUGID ) << "height: " << getHeight() << endl;
    //kDebug( DEBUGID ) << "width: " << getWidth() << endl;
}

void TextElement::draw( QPainter& painter, const LuPixelRect& /*r*/,
                        const ContextStyle& context,
                        ContextStyle::TextStyle tstyle,
                        ContextStyle::IndexStyle /*istyle*/,
                        const LuPixelPoint& parentOrigin )
{
    LuPixelPoint myPos( parentOrigin.x()+getX(), parentOrigin.y()+getY() );
    //if ( !LuPixelRect( myPos.x(), myPos.y(), getWidth(), getHeight() ).intersects( r ) )
    //    return;

    setUpPainter( context, painter );

    luPt mySize = context.getAdjustedSize( tstyle );
    QFont font = getFont( context );
    font.setPointSizeF( context.layoutUnitToFontSize( mySize, false ) );
    painter.setFont( font );

    // Each starting element draws the whole token
/*    ElementType* token = getElementType();
    if ( ( token != 0 ) && !symbol ) {
        QString text = token->text( static_cast<SequenceElement*>( getParent() ) );
        painter.drawText( context.layoutUnitToPixelX( myPos.x() ),
                          context.layoutUnitToPixelY( myPos.y()+getBaseline() ),
                          text );
    }
    else {
        //kDebug() << "draw char" << endl;
        QChar ch = getRealCharacter(context);
        if ( ch != QChar::Null ) {
            luPixel bl = getBaseline();
            if ( bl == -1 ) {
                // That's quite hacky and actually not the way it's
                // meant to be. You shouldn't calculate a lot in
                // draw. But I don't see how else to deal with
                // baseline==0 glyphs without yet another flag.
                bl = -( getHeight()/2 + context.axisHeight( tstyle ) );
            }
            painter.drawText( context.layoutUnitToPixelX( myPos.x() ),
                              context.layoutUnitToPixelY( myPos.y()+bl ),
                              ch );
        }
        else {
            painter.setPen( QPen( context.getErrorColor(),
                                  context.layoutUnitToPixelX( context.getLineWidth() ) ) );
            painter.drawRect( context.layoutUnitToPixelX( myPos.x() ),
                              context.layoutUnitToPixelY( myPos.y() ),
                              context.layoutUnitToPixelX( getWidth() ),
                              context.layoutUnitToPixelY( getHeight() ) );
        }
    }
*/
}


void TextElement::dispatchFontCommand( FontCommand* cmd )
{
    cmd->addTextElement( this );
}

void TextElement::setCharStyle( CharStyle cs )
{
    charStyle( cs );
    //formula()->changed();
}

void TextElement::setCharFamily( CharFamily cf )
{
    charFamily( cf );
    //formula()->changed();
}

QChar TextElement::getRealCharacter(const ContextStyle& context)
{
    if ( !isSymbol() ) {
        const FontStyle& fontStyle = context.fontStyle();
        const AlphaTable* alphaTable = fontStyle.alphaTable();
        if ( alphaTable != 0 ) {
#warning "port it"                              
            //AlphaTableEntry ate = alphaTable->entry( character,
            //                                         charFamily(),
             //                                        charStyle() );
            //if ( ate.valid() ) {
            //    return ate.pos;
            //}
        }
        return character;
    }
    else {
        return getSymbolTable().character(character, charStyle());
    }
}


QFont TextElement::getFont(const ContextStyle& context)
{
    if ( !isSymbol() ) {
        const FontStyle& fontStyle = context.fontStyle();
        const AlphaTable* alphaTable = fontStyle.alphaTable();
        if ( alphaTable != 0 ) {
#warning "kde4: port it"
            //AlphaTableEntry ate = alphaTable->entry( character,
            //                                         charFamily(),
            //                                         charStyle() );
            //if ( ate.valid() ) {
            //    return ate.font;
            //}
        }
        QFont font;
/*        if (getElementType() != 0) {
            font = getElementType()->getFont(context);
        }
        else {
            font = context.getDefaultFont();
        }*/
        switch ( charStyle() ) {
        case anyChar:
            break;
        case normalChar:
            font.setItalic( false );
            font.setBold( false );
            break;
        case boldChar:
            font.setItalic( false );
            font.setBold( true );
            break;
        case italicChar:
            font.setItalic( true );
            font.setBold( false );
            break;
        case boldItalicChar:
            font.setItalic( true );
            font.setBold( true );
            break;
        }
        return font;
    }
    return context.symbolTable().font( character, charStyle() );
}


void TextElement::setUpPainter(const ContextStyle& context, QPainter& painter)
{
/*    if (getElementType() != 0) {
        getElementType()->setUpPainter(context, painter);
    }
    else {
        painter.setPen(Qt::red);
    }*/
}

const SymbolTable& TextElement::getSymbolTable() const
{
    static SymbolTable s;
    return s;
}


void TextElement::writeDom(QDomElement element)
{
    BasicElement::writeDom(element);
    element.setAttribute("CHAR", QString(character));
    //QString s;
    //element.setAttribute("CHAR", s.sprintf( "#x%05X", character ) );
    if (symbol) element.setAttribute("SYMBOL", "3");

    switch ( charStyle() ) {
    case anyChar: break;
    case normalChar: element.setAttribute("STYLE", "normal"); break;
    case boldChar: element.setAttribute("STYLE", "bold"); break;
    case italicChar: element.setAttribute("STYLE", "italic"); break;
    case boldItalicChar: element.setAttribute("STYLE", "bolditalic"); break;
    }

    switch ( charFamily() ) {
    case normalFamily: element.setAttribute("FAMILY", "normal"); break;
    case scriptFamily: element.setAttribute("FAMILY", "script"); break;
    case frakturFamily: element.setAttribute("FAMILY", "fraktur"); break;
    case doubleStruckFamily: element.setAttribute("FAMILY", "doublestruck"); break;
    case anyFamily: break;
    }
}

bool TextElement::readAttributesFromDom(QDomElement element)
{
    if (!BasicElement::readAttributesFromDom(element)) {
        return false;
    }
    QString charStr = element.attribute("CHAR");
    if(!charStr.isNull()) {
        character = charStr.at(0);
    }
    QString symbolStr = element.attribute("SYMBOL");
    if(!symbolStr.isNull()) {
        int symbolInt = symbolStr.toInt();
        if ( symbolInt == 1 ) {
            character = getSymbolTable().unicodeFromSymbolFont(character);
        }
        if ( symbolInt == 2 ) {
            switch ( character.unicode() ) {
            case 0x03D5: character = 0x03C6; break;
            case 0x03C6: character = 0x03D5; break;
            case 0x03Ba: character = 0x03BA; break;
            case 0x00B4: character = 0x2032; break;
            case 0x2215: character = 0x2244; break;
            case 0x00B7: character = 0x2022; break;
            case 0x1D574: character = 0x2111; break;
            case 0x1D579: character = 0x211C; break;
            case 0x2219: character = 0x22C5; break;
            case 0x2662: character = 0x26C4; break;
            case 0x220B: character = 0x220D; break;
            case 0x224C: character = 0x2245; break;
            case 0x03DB: character = 0x03C2; break;
            }
        }
        symbol = symbolInt != 0;
    }

    QString styleStr = element.attribute("STYLE");
    if ( styleStr == "normal" ) {
        charStyle( normalChar );
    }
    else if ( styleStr == "bold" ) {
        charStyle( boldChar );
    }
    else if ( styleStr == "italic" ) {
        charStyle( italicChar );
    }
    else if ( styleStr == "bolditalic" ) {
        charStyle( boldItalicChar );
    }
    else {
        charStyle( anyChar );
    }

    QString familyStr = element.attribute( "FAMILY" );
    if ( familyStr == "normal" ) {
        charFamily( normalFamily );
    }
    else if ( familyStr == "script" ) {
        charFamily( scriptFamily );
    }
    else if ( familyStr == "fraktur" ) {
        charFamily( frakturFamily );
    }
    else if ( familyStr == "doublestruck" ) {
        charFamily( doubleStruckFamily );
    }
    else {
        charFamily( anyFamily );
    }

    return true;
}

bool TextElement::readContentFromDom(QDomNode& node)
{
    return BasicElement::readContentFromDom(node);
}

} // namespace KFormula

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