lib Library API Documentation

formulaelement.cc

00001 /* This file is part of the KDE project
00002    Copyright (C) 2001 Andrea Rizzi <rizzi@kde.org>
00003                   Ulrich Kuettler <ulrich.kuettler@mailbox.tu-dresden.de>
00004 
00005    This library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Library General Public
00007    License as published by the Free Software Foundation; either
00008    version 2 of the License, or (at your option) any later version.
00009 
00010    This library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Library General Public License for more details.
00014 
00015    You should have received a copy of the GNU Library General Public License
00016    along with this library; see the file COPYING.LIB.  If not, write to
00017    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00018    Boston, MA 02111-1307, USA.
00019 */
00020 
00021 #include <iostream>
00022 #include <qpainter.h>
00023 
00024 #include <kdebug.h>
00025 
00026 #include "contextstyle.h"
00027 #include "formulacursor.h"
00028 #include "formulaelement.h"
00029 #include "kformulacontainer.h"
00030 #include "kformuladocument.h"
00031 
00032 KFORMULA_NAMESPACE_BEGIN
00033 
00034 FormulaElement::FormulaElement(FormulaDocument* container)
00035     : document( container ), baseSize( 20 ), ownBaseSize( false )
00036 {
00037 }
00038 
00039 
00040 void FormulaElement::setBaseSize( int size )
00041 {
00042     if ( size > 0 ) {
00043         baseSize = size;
00044         ownBaseSize = true;
00045     }
00046     else {
00047         ownBaseSize = false;
00048     }
00049     document->baseSizeChanged( size, ownBaseSize );
00050 }
00051 
00052 
00056 BasicElement* FormulaElement::goToPos( FormulaCursor* cursor, const LuPixelPoint& point )
00057 {
00058     bool handled = false;
00059     BasicElement* element = inherited::goToPos(cursor, handled, point, LuPixelPoint());
00060     if (element == 0) {
00061         //if ((point.x() > getWidth()) || (point.y() > getHeight())) {
00062             cursor->setTo(this, countChildren());
00063             //}
00064             return this;
00065     }
00066     return element;
00067 }
00068 
00069 void FormulaElement::elementRemoval(BasicElement* child)
00070 {
00071     document->elementRemoval(child);
00072 }
00073 
00074 void FormulaElement::changed()
00075 {
00076     document->changed();
00077 }
00078 
00079 void FormulaElement::cursorHasMoved( FormulaCursor* cursor )
00080 {
00081     document->cursorHasMoved( cursor );
00082 }
00083 
00084 void FormulaElement::moveOutLeft( FormulaCursor* cursor )
00085 {
00086     document->moveOutLeft( cursor );
00087 }
00088 
00089 void FormulaElement::moveOutRight( FormulaCursor* cursor )
00090 {
00091     document->moveOutRight( cursor );
00092 }
00093 
00094 void FormulaElement::moveOutBelow( FormulaCursor* cursor )
00095 {
00096     document->moveOutBelow( cursor );
00097 }
00098 
00099 void FormulaElement::moveOutAbove( FormulaCursor* cursor )
00100 {
00101     document->moveOutAbove( cursor );
00102 }
00103 
00104 void FormulaElement::tell( const QString& msg )
00105 {
00106     document->tell( msg );
00107 }
00108 
00109 void FormulaElement::removeFormula( FormulaCursor* cursor )
00110 {
00111     document->removeFormula( cursor );
00112 }
00113 
00114 void FormulaElement::insertFormula( FormulaCursor* cursor )
00115 {
00116     document->insertFormula( cursor );
00117 }
00118 
00119 void FormulaElement::calcSizes( const ContextStyle& style,
00120                                 ContextStyle::TextStyle tstyle,
00121                                 ContextStyle::IndexStyle istyle )
00122 {
00123     inherited::calcSizes( style, tstyle, istyle );
00124 }
00125 
00126 
00127 void FormulaElement::draw( QPainter& painter, const LuPixelRect& r,
00128                            const ContextStyle& context,
00129                            ContextStyle::TextStyle tstyle,
00130                            ContextStyle::IndexStyle istyle,
00131                            const LuPixelPoint& parentOrigin )
00132 {
00133     inherited::draw( painter, r, context, tstyle, istyle, parentOrigin );
00134 }
00135 
00136 
00140 void FormulaElement::calcSizes( ContextStyle& context )
00141 {
00142     //kdDebug( DEBUGID ) << "FormulaElement::calcSizes" << endl;
00143     if ( ownBaseSize ) {
00144         context.setSizeFactor( static_cast<double>( getBaseSize() )/context.baseSize() );
00145     }
00146     else {
00147         context.setSizeFactor( 1 );
00148     }
00149     calcSizes( context, context.getBaseTextStyle(),
00150                ContextStyle::normal );
00151 }
00152 
00156 void FormulaElement::draw( QPainter& painter, const LuPixelRect& r,
00157                            ContextStyle& context )
00158 {
00159     //kdDebug( DEBUGID ) << "FormulaElement::draw" << endl;
00160     if ( ownBaseSize ) {
00161         context.setSizeFactor( static_cast<double>( getBaseSize() )/context.baseSize() );
00162     }
00163     else {
00164         context.setSizeFactor( 1 );
00165     }
00166     draw( painter, r, context, context.getBaseTextStyle(),
00167           ContextStyle::normal, LuPixelPoint() );
00168 }
00169 
00170 KCommand* FormulaElement::buildCommand( Container* container, Request* request )
00171 {
00172     switch ( *request ) {
00173     case req_compactExpression:
00174         return 0;
00175     default:
00176         break;
00177     }
00178     return inherited::buildCommand( container, request );
00179 }
00180 
00181 const SymbolTable& FormulaElement::getSymbolTable() const
00182 {
00183     return document->getSymbolTable();
00184 }
00185 
00186 
00187 QDomElement FormulaElement::emptyFormulaElement( QDomDocument doc )
00188 {
00189     QDomElement element = doc.createElement( getTagName() );
00190     /*
00191     element.setAttribute( "VERSION", "6" );
00192     if ( ownBaseSize ) {
00193         element.setAttribute( "BASESIZE", baseSize );
00194     }
00195     */
00196     return element;
00197 }
00198 
00199 KCommand* FormulaElement::input( Container* container, QKeyEvent* event )
00200 {
00201     QChar ch = event->text().at( 0 );
00202     if ( !ch.isPrint() ) {
00203         int action = event->key();
00204         //int state = event->state();
00205         //MoveFlag flag = movementFlag(state);
00206 
00207     switch ( action ) {
00208         case Qt::Key_Return:
00209         case Qt::Key_Enter: {
00210             FormulaCursor* cursor = container->activeCursor();
00211             insertFormula( cursor );
00212             return 0;
00213         }
00214         }
00215     }
00216     return inherited::input( container, event );
00217 }
00218 
00222 void FormulaElement::writeDom(QDomElement element)
00223 {
00224     inherited::writeDom(element);
00225     element.setAttribute( "VERSION", "6" );
00226     if ( ownBaseSize ) {
00227         element.setAttribute( "BASESIZE", baseSize );
00228     }
00229 }
00230 
00235 bool FormulaElement::readAttributesFromDom(QDomElement element)
00236 {
00237     if (!inherited::readAttributesFromDom(element)) {
00238         return false;
00239     }
00240     int version = -1;
00241     QString versionStr = element.attribute( "VERSION" );
00242     if ( !versionStr.isNull() ) {
00243         version = versionStr.toInt();
00244     }
00245     if ( version > -1 ) {
00246         // Version 6 added the MultilineElement (TabMarker)
00247         // Version 5 added under- and overlines
00248         if ( version < 4 ) {
00249             convertNames( element );
00250         }
00251     }
00252     QString baseSizeStr = element.attribute( "BASESIZE" );
00253     if ( !baseSizeStr.isNull() ) {
00254         ownBaseSize = true;
00255         baseSize = baseSizeStr.toInt();
00256     }
00257     else {
00258         ownBaseSize = false;
00259     }
00260     return true;
00261 }
00262 
00268 bool FormulaElement::readContentFromDom(QDomNode& node)
00269 {
00270     return inherited::readContentFromDom(node);
00271 }
00272 
00273 void FormulaElement::convertNames( QDomNode node )
00274 {
00275     if ( node.isElement() && ( node.nodeName().upper() == "TEXT" ) ) {
00276         QDomNamedNodeMap attr = node.attributes();
00277         QDomAttr ch = attr.namedItem( "CHAR" ).toAttr();
00278         if ( ch.value() == "\\" ) {
00279             QDomNode sequence = node.parentNode();
00280             QDomDocument doc = sequence.ownerDocument();
00281             QDomElement nameseq = doc.createElement( "NAMESEQUENCE" );
00282             sequence.replaceChild( nameseq, node );
00283 
00284             bool inName = true;
00285             while ( inName ) {
00286                 inName = false;
00287                 QDomNode n = nameseq.nextSibling();
00288                 if ( n.isElement() && ( n.nodeName().upper() == "TEXT" ) ) {
00289                     attr = n.attributes();
00290                     ch = attr.namedItem( "CHAR" ).toAttr();
00291                     if ( ch.value().at( 0 ).isLetter() ) {
00292                         nameseq.appendChild( sequence.removeChild( n ) );
00293                         inName = true;
00294                     }
00295                 }
00296             }
00297         }
00298     }
00299     if ( node.hasChildNodes() ) {
00300         QDomNode n = node.firstChild();
00301         while ( !n.isNull() ) {
00302             convertNames( n );
00303             n = n.nextSibling();
00304         }
00305     }
00306 }
00307 
00308 QString FormulaElement::toLatex()
00309 {
00310     return inherited::toLatex();   //Consider $$ sorround
00311 }
00312 
00313 void FormulaElement::writeMathML( QDomDocument doc, QDomNode parent )
00314 {
00315     QDomElement de = doc.createElementNS( "http://www.w3.org/1998/Math/MathML",
00316                                           "math" );
00317     inherited::writeMathML( doc, de );
00318     parent.appendChild( de );
00319 }
00320 
00321 KFORMULA_NAMESPACE_END
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