/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtQuick module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 3 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL3 included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 3 requirements ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 2.0 or (at your option) the GNU General ** Public license version 3 or any later version approved by the KDE Free ** Qt Foundation. The licenses are as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-2.0.html and ** https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include #include #include #include #include #include #include "qquickstyledtext_p.h" #include /* QQuickStyledText supports few tags: - bold - bold - italic
- new line

- paragraph - underlined text

- headers - anchor

- ordered and unordered lists
- preformated - images The opening and closing tags must be correctly nested. */ QT_BEGIN_NAMESPACE Q_GUI_EXPORT int qt_defaultDpi(); class QQuickStyledTextPrivate { public: enum ListType { Ordered, Unordered }; enum ListFormat { Bullet, Disc, Square, Decimal, LowerAlpha, UpperAlpha, LowerRoman, UpperRoman }; struct List { int level; ListType type; ListFormat format; }; QQuickStyledTextPrivate(const QString &t, QTextLayout &l, QList &imgTags, const QUrl &baseUrl, QQmlContext *context, bool preloadImages, bool *fontSizeModified) : text(t), layout(l), imgTags(&imgTags), baseFont(layout.font()), baseUrl(baseUrl), hasNewLine(true), nbImages(0), updateImagePositions(false) , preFormat(false), prependSpace(false), hasSpace(true), preloadImages(preloadImages), fontSizeModified(fontSizeModified), context(context) { } void parse(); void appendText(const QString &textIn, int start, int length, QString &textOut); bool parseTag(const QChar *&ch, const QString &textIn, QString &textOut, QTextCharFormat &format); bool parseCloseTag(const QChar *&ch, const QString &textIn, QString &textOut); void parseEntity(const QChar *&ch, const QString &textIn, QString &textOut); bool parseFontAttributes(const QChar *&ch, const QString &textIn, QTextCharFormat &format); bool parseOrderedListAttributes(const QChar *&ch, const QString &textIn); bool parseUnorderedListAttributes(const QChar *&ch, const QString &textIn); bool parseAnchorAttributes(const QChar *&ch, const QString &textIn, QTextCharFormat &format); void parseImageAttributes(const QChar *&ch, const QString &textIn, QString &textOut); QPair parseAttribute(const QChar *&ch, const QString &textIn); QStringRef parseValue(const QChar *&ch, const QString &textIn); void setFontSize(int size, QTextCharFormat &format); inline void skipSpace(const QChar *&ch) { while (ch->isSpace() && !ch->isNull()) ++ch; } static QString toAlpha(int value, bool upper); static QString toRoman(int value, bool upper); QString text; QTextLayout &layout; QList *imgTags; QFont baseFont; QStack listStack; QUrl baseUrl; bool hasNewLine; int nbImages; bool updateImagePositions; bool preFormat; bool prependSpace; bool hasSpace; bool preloadImages; bool *fontSizeModified; QQmlContext *context; 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; static const QChar bullet; static const QChar disc; static const QChar square; static const QChar lineFeed; static const QChar space; static const int tabsize = 6; }; const QChar QQuickStyledTextPrivate::lessThan(QLatin1Char('<')); const QChar QQuickStyledTextPrivate::greaterThan(QLatin1Char('>')); const QChar QQuickStyledTextPrivate::equals(QLatin1Char('=')); const QChar QQuickStyledTextPrivate::singleQuote(QLatin1Char('\'')); const QChar QQuickStyledTextPrivate::doubleQuote(QLatin1Char('\"')); const QChar QQuickStyledTextPrivate::slash(QLatin1Char('/')); const QChar QQuickStyledTextPrivate::ampersand(QLatin1Char('&')); const QChar QQuickStyledTextPrivate::bullet(0x2022); const QChar QQuickStyledTextPrivate::disc(0x25e6); const QChar QQuickStyledTextPrivate::square(0x25a1); const QChar QQuickStyledTextPrivate::lineFeed(QLatin1Char('\n')); const QChar QQuickStyledTextPrivate::space(QLatin1Char(' ')); QQuickStyledText::QQuickStyledText(const QString &string, QTextLayout &layout, QList &imgTags, const QUrl &baseUrl, QQmlContext *context, bool preloadImages, bool *fontSizeModified) : d(new QQuickStyledTextPrivate(string, layout, imgTags, baseUrl, context, preloadImages, fontSizeModified)) { } QQuickStyledText::~QQuickStyledText() { delete d; } void QQuickStyledText::parse(const QString &string, QTextLayout &layout, QList &imgTags, const QUrl &baseUrl, QQmlContext *context, bool preloadImages, bool *fontSizeModified) { if (string.isEmpty()) return; QQuickStyledText styledText(string, layout, imgTags, baseUrl, context, preloadImages, fontSizeModified); styledText.d->parse(); } void QQuickStyledTextPrivate::parse() { QVector ranges; QStack formatStack; QString drawText; drawText.reserve(text.count()); updateImagePositions = !imgTags->isEmpty(); int textStart = 0; int textLength = 0; int rangeStart = 0; bool formatChanged = false; const QChar *ch = text.constData(); while (!ch->isNull()) { if (*ch == lessThan) { if (textLength) { appendText(text, textStart, textLength, drawText); } else if (prependSpace) { drawText.append(space); prependSpace = false; hasSpace = true; } if (rangeStart != drawText.length() && formatStack.count()) { if (formatChanged) { QTextLayout::FormatRange formatRange; formatRange.format = formatStack.top(); formatRange.start = rangeStart; formatRange.length = drawText.length() - rangeStart; ranges.append(formatRange); formatChanged = false; } else if (ranges.count()) { ranges.last().length += drawText.length() - rangeStart; } } rangeStart = drawText.length(); ++ch; if (*ch == slash) { ++ch; if (parseCloseTag(ch, text, drawText)) { if (formatStack.count()) { formatChanged = true; formatStack.pop(); } } } else { QTextCharFormat format; if (formatStack.count()) format = formatStack.top(); if (parseTag(ch, text, drawText, format)) { formatChanged = true; formatStack.push(format); } } textStart = ch - text.constData() + 1; textLength = 0; } else if (*ch == ampersand) { ++ch; appendText(text, textStart, textLength, drawText); parseEntity(ch, text, drawText); textStart = ch - text.constData() + 1; textLength = 0; } else if (ch->isSpace()) { if (textLength) appendText(text, textStart, textLength, drawText); if (!preFormat) { prependSpace = !hasSpace; for (const QChar *n = ch + 1; !n->isNull() && n->isSpace(); ++n) ch = n; hasNewLine = false; } else if (*ch == lineFeed) { drawText.append(QChar(QChar::LineSeparator)); hasNewLine = true; } else { drawText.append(QChar(QChar::Nbsp)); hasNewLine = false; } textStart = ch - text.constData() + 1; textLength = 0; } else { ++textLength; } if (!ch->isNull()) ++ch; } if (textLength) appendText(text, textStart, textLength, drawText); if (rangeStart != drawText.length() && formatStack.count()) { if (formatChanged) { QTextLayout::FormatRange formatRange; formatRange.format = formatStack.top(); formatRange.start = rangeStart; formatRange.length = drawText.length() - rangeStart; ranges.append(formatRange); } else if (ranges.count()) { ranges.last().length += drawText.length() - rangeStart; } } layout.setText(drawText); layout.setFormats(ranges); } void QQuickStyledTextPrivate::appendText(const QString &textIn, int start, int length, QString &textOut) { if (prependSpace) textOut.append(space); textOut.append(QStringRef(&textIn, start, length)); prependSpace = false; hasSpace = false; hasNewLine = false; } // // Calculates and sets the correct font size in points // depending on the size multiplier and base font. // void QQuickStyledTextPrivate::setFontSize(int size, QTextCharFormat &format) { static const qreal scaling[] = { 0.7, 0.8, 1.0, 1.2, 1.5, 2.0, 2.4 }; if (baseFont.pointSizeF() != -1) format.setFontPointSize(baseFont.pointSize() * scaling[size - 1]); else format.setFontPointSize(baseFont.pixelSize() * qreal(72.) / qreal(qt_defaultDpi()) * scaling[size - 1]); *fontSizeModified = true; } bool QQuickStyledTextPrivate::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) { if (tagLength == 0) return false; QStringRef tag(&textIn, tagStart, tagLength); const QChar char0 = tag.at(0); if (char0 == QLatin1Char('b')) { if (tagLength == 1) { format.setFontWeight(QFont::Bold); return true; } else if (tagLength == 2 && tag.at(1) == QLatin1Char('r')) { textOut.append(QChar(QChar::LineSeparator)); hasSpace = true; prependSpace = false; return false; } } else if (char0 == QLatin1Char('i')) { if (tagLength == 1) { format.setFontItalic(true); return true; } } else if (char0 == QLatin1Char('p')) { if (tagLength == 1) { if (!hasNewLine) textOut.append(QChar::LineSeparator); hasSpace = true; prependSpace = false; } else if (tag == QLatin1String("pre")) { preFormat = true; if (!hasNewLine) textOut.append(QChar::LineSeparator); format.setFontFamily(QString::fromLatin1("Courier New,courier")); format.setFontFixedPitch(true); return true; } } else if (char0 == QLatin1Char('u')) { if (tagLength == 1) { format.setFontUnderline(true); return true; } else if (tag == QLatin1String("ul")) { List listItem; listItem.level = 0; listItem.type = Unordered; listItem.format = Bullet; listStack.push(listItem); } } else if (char0 == QLatin1Char('h') && tagLength == 2) { int level = tag.at(1).digitValue(); if (level >= 1 && level <= 6) { if (!hasNewLine) textOut.append(QChar::LineSeparator); hasSpace = true; prependSpace = false; setFontSize(7 - level, format); format.setFontWeight(QFont::Bold); return true; } } else if (tag == QLatin1String("strong")) { format.setFontWeight(QFont::Bold); return true; } else if (tag == QLatin1String("ol")) { List listItem; listItem.level = 0; listItem.type = Ordered; listItem.format = Decimal; listStack.push(listItem); } else if (tag == QLatin1String("li")) { if (!hasNewLine) textOut.append(QChar(QChar::LineSeparator)); if (!listStack.isEmpty()) { int count = ++listStack.top().level; for (int i = 0; i < listStack.size(); ++i) textOut += QString(tabsize, QChar::Nbsp); switch (listStack.top().format) { case Decimal: textOut += QString::number(count) % QLatin1Char('.'); break; case LowerAlpha: textOut += toAlpha(count, false) % QLatin1Char('.'); break; case UpperAlpha: textOut += toAlpha(count, true) % QLatin1Char('.'); break; case LowerRoman: textOut += toRoman(count, false) % QLatin1Char('.'); break; case UpperRoman: textOut += toRoman(count, true) % QLatin1Char('.'); break; case Bullet: textOut += bullet; break; case Disc: textOut += disc; break; case Square: textOut += square; break; } textOut += QString(2, QChar::Nbsp); } } return false; } else if (ch->isSpace()) { // may have params. QStringRef tag(&textIn, tagStart, tagLength); if (tag == QLatin1String("font")) return parseFontAttributes(ch, textIn, format); if (tag == QLatin1String("ol")) { parseOrderedListAttributes(ch, textIn); return false; // doesn't modify format } if (tag == QLatin1String("ul")) { parseUnorderedListAttributes(ch, textIn); return false; // doesn't modify format } if (tag == QLatin1String("a")) { return parseAnchorAttributes(ch, textIn, format); } if (tag == QLatin1String("img")) { parseImageAttributes(ch, textIn, textOut); return false; } if (*ch == greaterThan || ch->isNull()) continue; } else if (*ch != slash) { tagLength++; } ++ch; } return false; } bool QQuickStyledTextPrivate::parseCloseTag(const QChar *&ch, const QString &textIn, QString &textOut) { skipSpace(ch); int tagStart = ch - textIn.constData(); int tagLength = 0; while (!ch->isNull()) { if (*ch == greaterThan) { if (tagLength == 0) return false; QStringRef tag(&textIn, tagStart, tagLength); const QChar char0 = tag.at(0); hasNewLine = false; if (char0 == QLatin1Char('b')) { if (tagLength == 1) return true; else if (tag.at(1) == QLatin1Char('r') && tagLength == 2) return false; } else if (char0 == QLatin1Char('i')) { if (tagLength == 1) return true; } else if (char0 == QLatin1Char('a')) { if (tagLength == 1) return true; } else if (char0 == QLatin1Char('p')) { if (tagLength == 1) { textOut.append(QChar::LineSeparator); hasNewLine = true; hasSpace = true; return false; } else if (tag == QLatin1String("pre")) { preFormat = false; if (!hasNewLine) textOut.append(QChar::LineSeparator); hasNewLine = true; hasSpace = true; return true; } } else if (char0 == QLatin1Char('u')) { if (tagLength == 1) return true; else if (tag == QLatin1String("ul")) { if (!listStack.isEmpty()) { listStack.pop(); if (!listStack.count()) textOut.append(QChar::LineSeparator); } return false; } } else if (char0 == QLatin1Char('h') && tagLength == 2) { textOut.append(QChar::LineSeparator); hasNewLine = true; hasSpace = true; return true; } else if (tag == QLatin1String("font")) { return true; } else if (tag == QLatin1String("strong")) { return true; } else if (tag == QLatin1String("ol")) { if (!listStack.isEmpty()) { listStack.pop(); if (!listStack.count()) textOut.append(QChar::LineSeparator); } return false; } else if (tag == QLatin1String("li")) { return false; } return false; } else if (!ch->isSpace()){ tagLength++; } ++ch; } return false; } void QQuickStyledTextPrivate::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); else if (entity == QLatin1String("quot")) textOut += QChar(34); else if (entity == QLatin1String("nbsp")) textOut += QChar(QChar::Nbsp); return; } else if (*ch == QLatin1Char(' ')) { QStringRef entity(&textIn, entityStart - 1, entityLength + 1); textOut += entity + *ch; return; } ++entityLength; ++ch; } } bool QQuickStyledTextPrivate::parseFontAttributes(const QChar *&ch, const QString &textIn, QTextCharFormat &format) { bool valid = false; QPair 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) setFontSize(size, format); } } while (!ch->isNull() && !attr.first.isEmpty()); return valid; } bool QQuickStyledTextPrivate::parseOrderedListAttributes(const QChar *&ch, const QString &textIn) { bool valid = false; List listItem; listItem.level = 0; listItem.type = Ordered; listItem.format = Decimal; QPair attr; do { attr = parseAttribute(ch, textIn); if (attr.first == QLatin1String("type")) { valid = true; if (attr.second == QLatin1String("a")) listItem.format = LowerAlpha; else if (attr.second == QLatin1String("A")) listItem.format = UpperAlpha; else if (attr.second == QLatin1String("i")) listItem.format = LowerRoman; else if (attr.second == QLatin1String("I")) listItem.format = UpperRoman; } } while (!ch->isNull() && !attr.first.isEmpty()); listStack.push(listItem); return valid; } bool QQuickStyledTextPrivate::parseUnorderedListAttributes(const QChar *&ch, const QString &textIn) { bool valid = false; List listItem; listItem.level = 0; listItem.type = Unordered; listItem.format = Bullet; QPair attr; do { attr = parseAttribute(ch, textIn); if (attr.first == QLatin1String("type")) { valid = true; if (attr.second == QLatin1String("disc")) listItem.format = Disc; else if (attr.second == QLatin1String("square")) listItem.format = Square; } } while (!ch->isNull() && !attr.first.isEmpty()); listStack.push(listItem); return valid; } bool QQuickStyledTextPrivate::parseAnchorAttributes(const QChar *&ch, const QString &textIn, QTextCharFormat &format) { bool valid = false; QPair attr; do { attr = parseAttribute(ch, textIn); if (attr.first == QLatin1String("href")) { format.setAnchorHref(attr.second.toString()); format.setAnchor(true); format.setFontUnderline(true); valid = true; } } while (!ch->isNull() && !attr.first.isEmpty()); return valid; } void QQuickStyledTextPrivate::parseImageAttributes(const QChar *&ch, const QString &textIn, QString &textOut) { qreal imgWidth = 0.0; QFontMetricsF fm(layout.font()); const qreal spaceWidth = fm.width(QChar::Nbsp); const bool trailingSpace = textOut.endsWith(space); if (!updateImagePositions) { QQuickStyledTextImgTag *image = new QQuickStyledTextImgTag; image->position = textOut.length() + (trailingSpace ? 0 : 1); QPair attr; do { attr = parseAttribute(ch, textIn); if (attr.first == QLatin1String("src")) { image->url = QUrl(attr.second.toString()); } else if (attr.first == QLatin1String("width")) { image->size.setWidth(attr.second.toString().toInt()); } else if (attr.first == QLatin1String("height")) { image->size.setHeight(attr.second.toString().toInt()); } else if (attr.first == QLatin1String("align")) { if (attr.second.toString() == QLatin1String("top")) { image->align = QQuickStyledTextImgTag::Top; } else if (attr.second.toString() == QLatin1String("middle")) { image->align = QQuickStyledTextImgTag::Middle; } } } while (!ch->isNull() && !attr.first.isEmpty()); if (preloadImages && !image->size.isValid()) { // if we don't know its size but the image is a local image, // we load it in the pixmap cache and save its implicit size // to avoid a relayout later on. QUrl url = baseUrl.resolved(image->url); if (url.isLocalFile()) { image->pix = new QQuickPixmap(context->engine(), url, image->size); if (image->pix && image->pix->isReady()) { image->size = image->pix->implicitSize(); } else { delete image->pix; image->pix = 0; } } } imgWidth = image->size.width(); image->offset = -std::fmod(imgWidth, spaceWidth) / 2.0; imgTags->append(image); } else { // if we already have a list of img tags for this text // we only want to update the positions of these tags. QQuickStyledTextImgTag *image = imgTags->value(nbImages); image->position = textOut.length() + (trailingSpace ? 0 : 1); imgWidth = image->size.width(); image->offset = -std::fmod(imgWidth, spaceWidth) / 2.0; QPair attr; do { attr = parseAttribute(ch, textIn); } while (!ch->isNull() && !attr.first.isEmpty()); nbImages++; } QString padding(qFloor(imgWidth / spaceWidth), QChar::Nbsp); if (!trailingSpace) textOut += QLatin1Char(' '); textOut += padding + QLatin1Char(' '); } QPair QQuickStyledTextPrivate::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(attr,val); break; } else { ++attrLength; } ++ch; } return QPair(); } QStringRef QQuickStyledTextPrivate::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); } QString QQuickStyledTextPrivate::toAlpha(int value, bool upper) { const char baseChar = upper ? 'A' : 'a'; QString result; int c = value; while (c > 0) { c--; result.prepend(QChar(baseChar + (c % 26))); c /= 26; } return result; } QString QQuickStyledTextPrivate::toRoman(int value, bool upper) { QString result = QLatin1String("?"); // works for up to 4999 items if (value < 5000) { QByteArray romanNumeral; static const char romanSymbolsLower[] = "iiivixxxlxcccdcmmmm"; static const char romanSymbolsUpper[] = "IIIVIXXXLXCCCDCMMMM"; QByteArray romanSymbols; if (!upper) romanSymbols = QByteArray::fromRawData(romanSymbolsLower, sizeof(romanSymbolsLower)); else romanSymbols = QByteArray::fromRawData(romanSymbolsUpper, sizeof(romanSymbolsUpper)); int c[] = { 1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900, 1000 }; int n = value; for (int i = 12; i >= 0; n %= c[i], i--) { int q = n / c[i]; if (q > 0) { int startDigit = i + (i + 3) / 4; int numDigits; if (i % 4) { if ((i - 2) % 4) numDigits = 2; else numDigits = 1; } else numDigits = q; romanNumeral.append(romanSymbols.mid(startDigit, numDigits)); } } result = QString::fromLatin1(romanNumeral); } return result; } QT_END_NAMESPACE