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Diffstat (limited to 'src/declarative/util/qdeclarativestyledtext.cpp')
| -rw-r--r-- | src/declarative/util/qdeclarativestyledtext.cpp | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/src/declarative/util/qdeclarativestyledtext.cpp b/src/declarative/util/qdeclarativestyledtext.cpp new file mode 100644 index 0000000000..a99d27eb3f --- /dev/null +++ b/src/declarative/util/qdeclarativestyledtext.cpp @@ -0,0 +1,347 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QStack> +#include <QVector> +#include <QPainter> +#include <QTextLayout> +#include <QDebug> +#include <qmath.h> +#include "private/qdeclarativestyledtext_p.h" + +/* + QDeclarativeStyledText supports few tags: + + <b></b> - bold + <i></i> - italic + <br> - new line + <font color="color_name" size="1-7"></font> + + The opening and closing tags must be correctly nested. +*/ + +QT_BEGIN_NAMESPACE + +class QDeclarativeStyledTextPrivate +{ +public: + QDeclarativeStyledTextPrivate(const QString &t, QTextLayout &l) : text(t), layout(l), baseFont(layout.font()) {} + + void parse(); + bool parseTag(const QChar *&ch, const QString &textIn, QString &textOut, QTextCharFormat &format); + bool parseCloseTag(const QChar *&ch, const QString &textIn); + void parseEntity(const QChar *&ch, const QString &textIn, QString &textOut); + bool parseFontAttributes(const QChar *&ch, const QString &textIn, QTextCharFormat &format); + QPair<QStringRef,QStringRef> parseAttribute(const QChar *&ch, const QString &textIn); + QStringRef parseValue(const QChar *&ch, const QString &textIn); + + inline void skipSpace(const QChar *&ch) { + while (ch->isSpace() && !ch->isNull()) + ++ch; + } + + QString text; + QTextLayout &layout; + QFont baseFont; + + static const QChar lessThan; + static const QChar greaterThan; + static const QChar equals; + static const QChar singleQuote; + static const QChar doubleQuote; + static const QChar slash; + static const QChar ampersand; +}; + +const QChar QDeclarativeStyledTextPrivate::lessThan(QLatin1Char('<')); +const QChar QDeclarativeStyledTextPrivate::greaterThan(QLatin1Char('>')); +const QChar QDeclarativeStyledTextPrivate::equals(QLatin1Char('=')); +const QChar QDeclarativeStyledTextPrivate::singleQuote(QLatin1Char('\'')); +const QChar QDeclarativeStyledTextPrivate::doubleQuote(QLatin1Char('\"')); +const QChar QDeclarativeStyledTextPrivate::slash(QLatin1Char('/')); +const QChar QDeclarativeStyledTextPrivate::ampersand(QLatin1Char('&')); + +QDeclarativeStyledText::QDeclarativeStyledText(const QString &string, QTextLayout &layout) +: d(new QDeclarativeStyledTextPrivate(string, layout)) +{ +} + +QDeclarativeStyledText::~QDeclarativeStyledText() +{ + delete d; +} + +void QDeclarativeStyledText::parse(const QString &string, QTextLayout &layout) +{ + if (string.isEmpty()) + return; + QDeclarativeStyledText styledText(string, layout); + styledText.d->parse(); +} + +void QDeclarativeStyledTextPrivate::parse() +{ + QList<QTextLayout::FormatRange> ranges; + QStack<QTextCharFormat> formatStack; + + QString drawText; + drawText.reserve(text.count()); + + int textStart = 0; + int textLength = 0; + int rangeStart = 0; + const QChar *ch = text.constData(); + while (!ch->isNull()) { + if (*ch == lessThan) { + if (textLength) + drawText.append(QStringRef(&text, textStart, textLength)); + if (rangeStart != drawText.length() && formatStack.count()) { + QTextLayout::FormatRange formatRange; + formatRange.format = formatStack.top(); + formatRange.start = rangeStart; + formatRange.length = drawText.length() - rangeStart; + ranges.append(formatRange); + } + rangeStart = drawText.length(); + ++ch; + if (*ch == slash) { + ++ch; + if (parseCloseTag(ch, text)) { + if (formatStack.count()) + formatStack.pop(); + } + } else { + QTextCharFormat format; + if (formatStack.count()) + format = formatStack.top(); + if (parseTag(ch, text, drawText, format)) + formatStack.push(format); + } + textStart = ch - text.constData() + 1; + textLength = 0; + } else if (*ch == ampersand) { + ++ch; + drawText.append(QStringRef(&text, textStart, textLength)); + parseEntity(ch, text, drawText); + textStart = ch - text.constData() + 1; + textLength = 0; + } else { + ++textLength; + } + if (!ch->isNull()) + ++ch; + } + if (textLength) + drawText.append(QStringRef(&text, textStart, textLength)); + if (rangeStart != drawText.length() && formatStack.count()) { + QTextLayout::FormatRange formatRange; + formatRange.format = formatStack.top(); + formatRange.start = rangeStart; + formatRange.length = drawText.length() - rangeStart; + ranges.append(formatRange); + } + + layout.setText(drawText); + layout.setAdditionalFormats(ranges); +} + +bool QDeclarativeStyledTextPrivate::parseTag(const QChar *&ch, const QString &textIn, QString &textOut, QTextCharFormat &format) +{ + skipSpace(ch); + + int tagStart = ch - textIn.constData(); + int tagLength = 0; + while (!ch->isNull()) { + if (*ch == greaterThan) { + QStringRef tag(&textIn, tagStart, tagLength); + const QChar char0 = tag.at(0); + if (char0 == QLatin1Char('b')) { + if (tagLength == 1) + format.setFontWeight(QFont::Bold); + else if (tagLength == 2 && tag.at(1) == QLatin1Char('r')) { + textOut.append(QChar(QChar::LineSeparator)); + return false; + } + } else if (char0 == QLatin1Char('i')) { + if (tagLength == 1) + format.setFontItalic(true); + } + return true; + } else if (ch->isSpace()) { + // may have params. + QStringRef tag(&textIn, tagStart, tagLength); + if (tag == QLatin1String("font")) + return parseFontAttributes(ch, textIn, format); + if (*ch == greaterThan || ch->isNull()) + continue; + } else if (*ch != slash){ + tagLength++; + } + ++ch; + } + + return false; +} + +bool QDeclarativeStyledTextPrivate::parseCloseTag(const QChar *&ch, const QString &textIn) +{ + skipSpace(ch); + + int tagStart = ch - textIn.constData(); + int tagLength = 0; + while (!ch->isNull()) { + if (*ch == greaterThan) { + QStringRef tag(&textIn, tagStart, tagLength); + const QChar char0 = tag.at(0); + if (char0 == QLatin1Char('b')) { + if (tagLength == 1) + return true; + else if (tag.at(1) == QLatin1Char('r') && tagLength == 2) + return true; + } else if (char0 == QLatin1Char('i')) { + if (tagLength == 1) + return true; + } else if (tag == QLatin1String("font")) { + return true; + } + return false; + } else if (!ch->isSpace()){ + tagLength++; + } + ++ch; + } + + return false; +} + +void QDeclarativeStyledTextPrivate::parseEntity(const QChar *&ch, const QString &textIn, QString &textOut) +{ + int entityStart = ch - textIn.constData(); + int entityLength = 0; + while (!ch->isNull()) { + if (*ch == QLatin1Char(';')) { + QStringRef entity(&textIn, entityStart, entityLength); + if (entity == QLatin1String("gt")) + textOut += QChar(62); + else if (entity == QLatin1String("lt")) + textOut += QChar(60); + else if (entity == QLatin1String("amp")) + textOut += QChar(38); + return; + } + ++entityLength; + ++ch; + } +} + +bool QDeclarativeStyledTextPrivate::parseFontAttributes(const QChar *&ch, const QString &textIn, QTextCharFormat &format) +{ + bool valid = false; + QPair<QStringRef,QStringRef> attr; + do { + attr = parseAttribute(ch, textIn); + if (attr.first == QLatin1String("color")) { + valid = true; + format.setForeground(QColor(attr.second.toString())); + } else if (attr.first == QLatin1String("size")) { + valid = true; + int size = attr.second.toString().toInt(); + if (attr.second.at(0) == QLatin1Char('-') || attr.second.at(0) == QLatin1Char('+')) + size += 3; + if (size >= 1 && size <= 7) { + static const qreal scaling[] = { 0.7, 0.8, 1.0, 1.2, 1.5, 2.0, 2.4 }; + format.setFontPointSize(baseFont.pointSize() * scaling[size-1]); + } + } + } while (!ch->isNull() && !attr.first.isEmpty()); + + return valid; +} + +QPair<QStringRef,QStringRef> QDeclarativeStyledTextPrivate::parseAttribute(const QChar *&ch, const QString &textIn) +{ + skipSpace(ch); + + int attrStart = ch - textIn.constData(); + int attrLength = 0; + while (!ch->isNull()) { + if (*ch == greaterThan) { + break; + } else if (*ch == equals) { + ++ch; + if (*ch != singleQuote && *ch != doubleQuote) { + while (*ch != greaterThan && !ch->isNull()) + ++ch; + break; + } + ++ch; + if (!attrLength) + break; + QStringRef attr(&textIn, attrStart, attrLength); + QStringRef val = parseValue(ch, textIn); + if (!val.isEmpty()) + return QPair<QStringRef,QStringRef>(attr,val); + break; + } else { + ++attrLength; + } + ++ch; + } + + return QPair<QStringRef,QStringRef>(); +} + +QStringRef QDeclarativeStyledTextPrivate::parseValue(const QChar *&ch, const QString &textIn) +{ + int valStart = ch - textIn.constData(); + int valLength = 0; + while (*ch != singleQuote && *ch != doubleQuote && !ch->isNull()) { + ++valLength; + ++ch; + } + if (ch->isNull()) + return QStringRef(); + ++ch; // skip quote + + return QStringRef(&textIn, valStart, valLength); +} + +QT_END_NAMESPACE |