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KPIMTextedit Library

textutils.cpp
00001 /*
00002     This file is part of KDE.
00003 
00004     Copyright (c) 2009 Thomas McGuire <mcguire@kde.org>
00005     Copyright (c) 2010 Stephen Kelly <steveire@gmail.com>
00006 
00007     This library is free software; you can redistribute it and/or modify it
00008     under the terms of the GNU Library General Public License as published by
00009     the Free Software Foundation; either version 2 of the License, or (at your
00010     option) any later version.
00011 
00012     This library is distributed in the hope that it will be useful, but WITHOUT
00013     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00014     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00015     License for more details.
00016 
00017     You should have received a copy of the GNU Library General Public License
00018     along with this library; see the file COPYING.LIB.  If not, write to the
00019     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00020     02110-1301, USA.
00021 */
00022 
00023 #include "textutils.h"
00024 
00025 #include <QtGui/QTextBlock>
00026 #include <QtGui/QTextCharFormat>
00027 #include <QtGui/QTextDocument>
00028 #include <KDE/KDebug>
00029 
00030 using namespace KPIMTextEdit;
00031 
00032 static bool isCharFormatFormatted( const QTextCharFormat &format, const QFont &defaultFont,
00033                                    const QTextCharFormat &defaultBlockFormat )
00034 {
00035   if ( !format.anchorHref().isEmpty() ||
00036        format.font() != defaultFont ||
00037        format.isAnchor() ||
00038        format.verticalAlignment() != defaultBlockFormat.verticalAlignment() ||
00039        format.layoutDirection() != defaultBlockFormat.layoutDirection() ||
00040        format.underlineStyle() != defaultBlockFormat.underlineStyle() ||
00041        format.foreground().color() != defaultBlockFormat.foreground().color() ||
00042        format.background().color() != defaultBlockFormat.background().color() ) {
00043     return true;
00044   }
00045 
00046   return false;
00047 }
00048 
00049 static bool isBlockFormatFormatted( const QTextBlockFormat &format,
00050                                     const QTextBlockFormat &defaultFormat )
00051 {
00052   if ( format.alignment() != defaultFormat.alignment() ||
00053        format.layoutDirection() != defaultFormat.layoutDirection() ||
00054        format.indent() != defaultFormat.indent() ||
00055        format.textIndent() != defaultFormat.textIndent() ) {
00056     return true;
00057   }
00058 
00059   return false;
00060 }
00061 
00063 static bool isSpecial( const QTextFormat &charFormat )
00064 {
00065   return charFormat.isFrameFormat() || charFormat.isImageFormat() ||
00066          charFormat.isListFormat() || charFormat.isTableFormat();
00067 }
00068 
00069 bool TextUtils::containsFormatting( const QTextDocument *document )
00070 {
00071   if ( !document ) {
00072     return false;
00073   }
00074 
00075   QTextDocument defaultTextDocument;
00076   const QTextCharFormat defaultCharFormat = defaultTextDocument.begin().charFormat();
00077   const QTextBlockFormat defaultBlockFormat = defaultTextDocument.begin().blockFormat();
00078   const QFont defaultFont = defaultTextDocument.defaultFont();
00079 
00080   QTextBlock block = document->firstBlock();
00081   while ( block.isValid() ) {
00082 
00083     if ( isBlockFormatFormatted( block.blockFormat(), defaultBlockFormat ) ) {
00084       return true;
00085     }
00086 
00087     if ( isSpecial( block.charFormat() ) || isSpecial( block.blockFormat() ) ||
00088          block.textList() ) {
00089       return true;
00090     }
00091 
00092     QTextBlock::iterator it = block.begin();
00093     while ( !it.atEnd() ) {
00094       const QTextFragment fragment = it.fragment();
00095       const QTextCharFormat charFormat = fragment.charFormat();
00096       if ( isSpecial( charFormat ) ) {
00097         return true;
00098       }
00099       if ( isCharFormatFormatted( fragment.charFormat(), defaultFont, defaultCharFormat ) ) {
00100         return true;
00101       }
00102 
00103       it++;
00104     }
00105 
00106     block = block.next();
00107   }
00108 
00109   if ( document->toHtml().contains( QLatin1String( "<hr />" ) ) ) {
00110     return true;
00111   }
00112 
00113   return false;
00114 }
00115 
00116 QString TextUtils::flowText( QString &wrappedText, const QString &indent, int maxLength )
00117 {
00118   if ( wrappedText.isEmpty() ) {
00119     return indent;
00120   }
00121 
00122   if ( maxLength <= indent.length() ) {
00123     kWarning() << "indent was set to a string that is longer or the same length "
00124                << "as maxLength, setting maxLength to indent.length() + 1";
00125     maxLength = indent.length() + 1;
00126   }
00127 
00128   maxLength -= indent.length(); // take into account indent
00129   QString result;
00130   while ( !wrappedText.isEmpty() )
00131   {
00132     // first check for the next newline. if it's before maxLength, break there, and continue
00133     int newLine = wrappedText.indexOf( QLatin1Char( '\n' ) );
00134     if( newLine > 0 && newLine <= maxLength ) {
00135       result += indent + wrappedText.left( newLine + 1 );
00136       wrappedText = wrappedText.mid( newLine + 1 );
00137       continue;
00138     }
00139     // Find the next point in the wrappedText where we have to do a line break.
00140     // Start searching at maxLength position and then walk backwards looking
00141     // for a space.
00142     int breakPosition;
00143     if ( wrappedText.length() > maxLength ) {
00144       breakPosition = maxLength;
00145       while ( ( breakPosition >= 0 ) && ( wrappedText[breakPosition] != QLatin1Char( ' ' ) ) ) {
00146         breakPosition--;
00147       }
00148       if ( breakPosition <= 0 ) {
00149         // Couldn't break before maxLength.
00150         breakPosition = maxLength;
00151       }
00152     } else {
00153       breakPosition = wrappedText.length();
00154     }
00155 
00156     QString line = wrappedText.left( breakPosition );
00157     if ( breakPosition < wrappedText.length() ) {
00158       wrappedText = wrappedText.mid( breakPosition );
00159     } else {
00160       wrappedText.clear();
00161     }
00162 
00163     // Strip leading whitespace of new lines, since that looks strange
00164     if ( !result.isEmpty() && line.startsWith( QLatin1Char( ' ' ) ) ) {
00165       line = line.mid( 1 );
00166     }
00167 
00168     result += indent + line + QLatin1Char( '\n' );
00169   }
00170 
00171   return result.left( result.length() - 1 );
00172 }
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