qquicktext.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquicktext_p.h"
#include "qquicktext_p_p.h"
 
#include <private/qqmldebugserviceinterfaces_p.h>
#include <private/qqmldebugconnector_p.h>
 
#include <QtQuick/private/qsgcontext_p.h>
#include <private/qqmlglobal_p.h>
#include <private/qsgadaptationlayer_p.h>
#include "qsginternaltextnode_p.h"
#include "qquicktextutil_p.h"
 
#include <QtQuick/private/qsgtexture_p.h>
 
#include <QtQml/qqmlinfo.h>
#include <QtGui/qevent.h>
#include <QtGui/qabstracttextdocumentlayout.h>
#include <QtGui/qpainter.h>
#include <QtGui/qtextdocument.h>
#include <QtGui/qtextobject.h>
#include <QtGui/qtextcursor.h>
#include <QtGui/qguiapplication.h>
#include <QtGui/qinputmethod.h>
 
#include <private/qtextengine_p.h>
#include <private/qquickstyledtext_p.h>
#include <QtQuick/private/qquickpixmap_p.h>
 
#include <qmath.h>
#include <limits.h>
 
QT_BEGIN_NAMESPACE
 
Q_DECLARE_LOGGING_CATEGORY(lcHoverTrace)
Q_LOGGING_CATEGORY(lcText, "qt.quick.text")
 
using namespace Qt::StringLiterals;
 
const QChar QQuickTextPrivate::elideChar = QChar(0x2026);
 
#if !defined(QQUICKTEXT_LARGETEXT_THRESHOLD)
  #define QQUICKTEXT_LARGETEXT_THRESHOLD 10000
#endif
// if QString::size() > largeTextSizeThreshold, we render more often, but only visible lines
const int QQuickTextPrivate::largeTextSizeThreshold = QQUICKTEXT_LARGETEXT_THRESHOLD;
 
QQuickTextPrivate::QQuickTextPrivate()
    : fontInfo(font), lineWidth(0)
    , color(0xFF000000), linkColor(0xFF0000FF), styleColor(0xFF000000)
    , lineCount(1), multilengthEos(-1)
    , elideMode(QQuickText::ElideNone), hAlign(QQuickText::AlignLeft), vAlign(QQuickText::AlignTop)
    , format(QQuickText::AutoText), wrapMode(QQuickText::NoWrap)
    , style(QQuickText::Normal)
    , renderType(QQuickTextUtil::textRenderType<QQuickText>())
    , updateType(UpdatePaintNode)
    , maximumLineCountValid(false), updateOnComponentComplete(true), richText(false)
    , styledText(false), widthExceeded(false), heightExceeded(false), internalWidthUpdate(false)
    , requireImplicitSize(false), implicitWidthValid(false), implicitHeightValid(false)
    , truncated(false), hAlignImplicit(true), rightToLeftText(false)
    , layoutTextElided(false), textHasChanged(true), needToUpdateLayout(false), formatModifiesFontSize(false)
    , polishSize(false)
    , updateSizeRecursionGuard(false)
{
    implicitAntialiasing = true;
}
 
QQuickTextPrivate::ExtraData::ExtraData()
    : padding(0)
    , topPadding(0)
    , leftPadding(0)
    , rightPadding(0)
    , bottomPadding(0)
    , explicitTopPadding(false)
    , explicitLeftPadding(false)
    , explicitRightPadding(false)
    , explicitBottomPadding(false)
    , lineHeight(1.0)
    , doc(nullptr)
    , minimumPixelSize(12)
    , minimumPointSize(12)
    , maximumLineCount(INT_MAX)
    , renderTypeQuality(QQuickText::DefaultRenderTypeQuality)
    , lineHeightValid(false)
    , lineHeightMode(QQuickText::ProportionalHeight)
    , fontSizeMode(QQuickText::FixedSize)
{
}
 
void QQuickTextPrivate::init()
{
    Q_Q(QQuickText);
    q->setAcceptedMouseButtons(Qt::LeftButton);
    q->setFlag(QQuickItem::ItemHasContents);
    q->setFlag(QQuickItem::ItemObservesViewport); // default until size is known
}
 
QQuickTextPrivate::~QQuickTextPrivate()
{
    if (extra.isAllocated()) {
        qDeleteAll(extra->imgTags);
        extra->imgTags.clear();
    }
}
 
qreal QQuickTextPrivate::getImplicitWidth() const
{
    if (!requireImplicitSize) {
        // We don't calculate implicitWidth unless it is required.
        // We need to force a size update now to ensure implicitWidth is calculated
        QQuickTextPrivate *me = const_cast<QQuickTextPrivate*>(this);
        me->requireImplicitSize = true;
        me->updateSize();
    }
    return implicitWidth;
}
 
qreal QQuickTextPrivate::getImplicitHeight() const
{
    if (!requireImplicitSize) {
        QQuickTextPrivate *me = const_cast<QQuickTextPrivate*>(this);
        me->requireImplicitSize = true;
        me->updateSize();
    }
    return implicitHeight;
}
 
qreal QQuickTextPrivate::availableWidth() const
{
    Q_Q(const QQuickText);
    return q->width() - q->leftPadding() - q->rightPadding();
}
 
qreal QQuickTextPrivate::availableHeight() const
{
    Q_Q(const QQuickText);
    return q->height() - q->topPadding() - q->bottomPadding();
}
 
void QQuickTextPrivate::setTopPadding(qreal value, bool reset)
{
    Q_Q(QQuickText);
    qreal oldPadding = q->topPadding();
    if (!reset || extra.isAllocated()) {
        extra.value().topPadding = value;
        extra.value().explicitTopPadding = !reset;
    }
    if ((!reset && !qFuzzyCompare(oldPadding, value)) || (reset && !qFuzzyCompare(oldPadding, padding()))) {
        updateSize();
        emit q->topPaddingChanged();
    }
}
 
void QQuickTextPrivate::setLeftPadding(qreal value, bool reset)
{
    Q_Q(QQuickText);
    qreal oldPadding = q->leftPadding();
    if (!reset || extra.isAllocated()) {
        extra.value().leftPadding = value;
        extra.value().explicitLeftPadding = !reset;
    }
    if ((!reset && !qFuzzyCompare(oldPadding, value)) || (reset && !qFuzzyCompare(oldPadding, padding()))) {
        updateSize();
        emit q->leftPaddingChanged();
    }
}
 
void QQuickTextPrivate::setRightPadding(qreal value, bool reset)
{
    Q_Q(QQuickText);
    qreal oldPadding = q->rightPadding();
    if (!reset || extra.isAllocated()) {
        extra.value().rightPadding = value;
        extra.value().explicitRightPadding = !reset;
    }
    if ((!reset && !qFuzzyCompare(oldPadding, value)) || (reset && !qFuzzyCompare(oldPadding, padding()))) {
        updateSize();
        emit q->rightPaddingChanged();
    }
}
 
void QQuickTextPrivate::setBottomPadding(qreal value, bool reset)
{
    Q_Q(QQuickText);
    qreal oldPadding = q->bottomPadding();
    if (!reset || extra.isAllocated()) {
        extra.value().bottomPadding = value;
        extra.value().explicitBottomPadding = !reset;
    }
    if ((!reset && !qFuzzyCompare(oldPadding, value)) || (reset && !qFuzzyCompare(oldPadding, padding()))) {
        updateSize();
        emit q->bottomPaddingChanged();
    }
}
 
void QQuickText::q_updateLayout()
{
    Q_D(QQuickText);
    d->updateLayout();
}
 
void QQuickTextPrivate::updateLayout()
{
    Q_Q(QQuickText);
    if (!q->isComponentComplete()) {
        updateOnComponentComplete = true;
        return;
    }
    updateOnComponentComplete = false;
    layoutTextElided = false;
 
    if (extra.isAllocated())
        extra->visibleImgTags.clear();
    needToUpdateLayout = false;
 
    // Setup instance of QTextLayout for all cases other than richtext
    if (!richText) {
        if (textHasChanged) {
            if (styledText && !text.isEmpty()) {
                layout.setFont(font);
                // needs temporary bool because formatModifiesFontSize is in a bit-field
                bool fontSizeModified = false;
                QList<QQuickStyledTextImgTag*> someImgTags = extra.isAllocated() ? extra->imgTags : QList<QQuickStyledTextImgTag*>();
                QQuickStyledText::parse(text, layout, someImgTags, q->baseUrl(), qmlContext(q), !maximumLineCountValid, &fontSizeModified);
                if (someImgTags.size() || extra.isAllocated())
                    extra.value().imgTags = someImgTags;
                formatModifiesFontSize = fontSizeModified;
                multilengthEos = -1;
            } else {
                QString tmp = text;
                multilengthEos = tmp.indexOf(QLatin1Char('\x9c'));
                if (multilengthEos != -1)
                    tmp = tmp.mid(0, multilengthEos);
                tmp.replace(QLatin1Char('\n'), QChar::LineSeparator);
                layout.setText(tmp);
            }
            textHasChanged = false;
        }
    } else if (extra.isAllocated() && extra->lineHeightValid) {
        ensureDoc();
        QTextBlockFormat::LineHeightTypes type;
        type = lineHeightMode() == QQuickText::FixedHeight ? QTextBlockFormat::FixedHeight : QTextBlockFormat::ProportionalHeight;
        QTextBlockFormat blockFormat;
        blockFormat.setLineHeight((lineHeightMode() == QQuickText::FixedHeight ? lineHeight() : lineHeight() * 100), type);
        for (QTextBlock it = extra->doc->begin(); it != extra->doc->end(); it = it.next()) {
            QTextCursor cursor(it);
            cursor.mergeBlockFormat(blockFormat);
        }
    }
 
    updateSize();
 
    if (needToUpdateLayout) {
        needToUpdateLayout = false;
        textHasChanged = true;
        updateLayout();
    }
 
    q->polish();
}
 
QVariant QQuickText::loadResource(int type, const QUrl &source)
{
    Q_D(QQuickText);
    const QUrl url = d->extra->doc->baseUrl().resolved(source);
    if (url.isLocalFile()) {
        // qmlWarning if the file doesn't exist (because QTextDocument::loadResource() can't do that)
        const QFileInfo fi(QQmlFile::urlToLocalFileOrQrc(url));
        if (!fi.exists())
            qmlWarning(this) << "Cannot open: " << url.toString();
        // let QTextDocument::loadResource() handle local file loading
        return {};
    }
    // see if we already started a load job
    for (auto it = d->extra->pixmapsInProgress.cbegin(); it != d->extra->pixmapsInProgress.cend();) {
        auto *job = *it;
        if (job->url() == url) {
            if (job->isError()) {
                qmlWarning(this) << job->error();
                delete *it;
                it = d->extra->pixmapsInProgress.erase(it);
                return QImage();
            }
            qCDebug(lcText) << "already downloading" << url;
            // existing job: return a null variant if it's not done yet
            return job->isReady() ? job->image() : QVariant();
        }
        ++it;
    }
    qCDebug(lcText) << "loading" << source << "resolved" << url
                    << "type" << static_cast<QTextDocument::ResourceType>(type);
    QQmlContext *context = qmlContext(this);
    Q_ASSERT(context);
    // don't cache it in QQuickPixmapCache, because it's cached in QTextDocumentPrivate::cachedResources
    QQuickPixmap *p = new QQuickPixmap(context->engine(), url, QQuickPixmap::Options{});
    p->connectFinished(this, SLOT(resourceRequestFinished()));
    d->extra->pixmapsInProgress.append(p);
    // the new job is probably not done; return a null variant if the caller should poll again
    return p->isReady() ? p->image() : QVariant();
}
 
void QQuickText::resourceRequestFinished()
{
    Q_D(QQuickText);
    bool allDone = true;
    for (auto it = d->extra->pixmapsInProgress.cbegin(); it != d->extra->pixmapsInProgress.cend();) {
        auto *job = *it;
        if (job->isError()) {
            // get QTextDocument::loadResource() to call QQuickText::loadResource() again, to return the placeholder
            qCDebug(lcText) << "failed to load" << job->url();
            d->extra->doc->resource(QTextDocument::ImageResource, job->url());
        } else if (job->isReady()) {
            // get QTextDocument::loadResource() to call QQuickText::loadResource() again, and cache the result
            auto res = d->extra->doc->resource(QTextDocument::ImageResource, job->url());
            // If QTextDocument::resource() returned a valid variant, it's been cached too. Either way, the job is done.
            qCDebug(lcText) << (res.isValid() ? "done downloading" : "failed to load") << job->url();
            delete *it;
            it = d->extra->pixmapsInProgress.erase(it);
        } else {
            allDone = false;
            ++it;
        }
    }
    if (allDone) {
        Q_ASSERT(d->extra->pixmapsInProgress.isEmpty());
        d->updateLayout();
    }
}
 
void QQuickText::imageDownloadFinished()
{
    Q_D(QQuickText);
    if (!d->extra.isAllocated())
        return;
 
    if (std::any_of(d->extra->imgTags.cbegin(), d->extra->imgTags.cend(),
                    [] (auto *image) { return image->pix && image->pix->isLoading(); })) {
        // return if we still have any active download
        return;
    }
 
    // when all the remote images have been downloaded,
    // if one of the sizes was not specified at parsing time
    // we use the implicit size from pixmapcache and re-layout.
 
    bool needToUpdateLayout = false;
    for (QQuickStyledTextImgTag *img : std::as_const(d->extra->visibleImgTags)) {
        if (!img->size.isValid()) {
            img->size = img->pix->implicitSize();
            needToUpdateLayout = true;
        }
    }
 
    if (needToUpdateLayout) {
        d->textHasChanged = true;
        d->updateLayout();
    } else {
        d->updateType = QQuickTextPrivate::UpdatePaintNode;
        update();
    }
}
 
void QQuickTextPrivate::updateBaseline(qreal baseline, qreal dy)
{
    Q_Q(QQuickText);
 
    qreal yoff = 0;
 
    if (q->heightValid()) {
        if (vAlign == QQuickText::AlignBottom)
            yoff = dy;
        else if (vAlign == QQuickText::AlignVCenter)
            yoff = dy/2;
    }
 
    q->setBaselineOffset(baseline + yoff + q->topPadding());
}
 
void QQuickTextPrivate::signalSizeChange(const QSizeF &previousSize)
{
    Q_Q(QQuickText);
    const QSizeF contentSize(q->contentWidth(), q->contentHeight());
 
    if (contentSize != previousSize) {
        emit q->contentSizeChanged();
        if (contentSize.width() != previousSize.width())
            emit q->contentWidthChanged(contentSize.width());
        if (contentSize.height() != previousSize.height())
            emit q->contentHeightChanged(contentSize.height());
    }
}
 
void QQuickTextPrivate::updateSize()
{
    Q_Q(QQuickText);
 
    if (!q->isComponentComplete()) {
        updateOnComponentComplete = true;
        return;
    }
 
    if (!requireImplicitSize) {
        implicitWidthChanged();
        implicitHeightChanged();
        // if the implicitWidth is used, then updateSize() has already been called (recursively)
        if (requireImplicitSize)
            return;
    }
 
    qreal hPadding = q->leftPadding() + q->rightPadding();
    qreal vPadding = q->topPadding() + q->bottomPadding();
 
    const QSizeF previousSize(q->contentWidth(), q->contentHeight());
 
    if (text.isEmpty() && !isLineLaidOutConnected() && fontSizeMode() == QQuickText::FixedSize) {
        // How much more expensive is it to just do a full layout on an empty string here?
        // There may be subtle differences in the height and baseline calculations between
        // QTextLayout and QFontMetrics and the number of variables that can affect the size
        // and position of a line is increasing.
        QFontMetricsF fm(font);
        qreal fontHeight = qCeil(fm.height());  // QScriptLine and therefore QTextLine rounds up
        if (!richText) {                        // line height, so we will as well.
            fontHeight = lineHeightMode() == QQuickText::FixedHeight
                    ? lineHeight()
                    : fontHeight * lineHeight();
        }
        updateBaseline(fm.ascent(), q->height() - fontHeight - vPadding);
        q->setImplicitSize(hPadding, fontHeight + qMax(lineHeightOffset(), 0) + vPadding);
        layedOutTextRect = QRectF(0, 0, 0, fontHeight);
        advance = QSizeF();
        signalSizeChange(previousSize);
        lineCount = 1;
        emit q->lineCountChanged();
        updateType = UpdatePaintNode;
        q->update();
        return;
    }
 
    QSizeF size(0, 0);
 
    //setup instance of QTextLayout for all cases other than richtext
    if (!richText) {
        qreal baseline = 0;
        QRectF textRect = setupTextLayout(&baseline);
 
        if (internalWidthUpdate)    // probably the result of a binding loop, but by letting it
            return;      // get this far we'll get a warning to that effect if it is.
 
        layedOutTextRect = textRect;
        size = textRect.size();
        updateBaseline(baseline, q->height() - size.height() - vPadding);
    } else {
        widthExceeded = true; // always relayout rich text on width changes..
        heightExceeded = false; // rich text layout isn't affected by height changes.
        ensureDoc();
        extra->doc->setDefaultFont(font);
        QQuickText::HAlignment horizontalAlignment = q->effectiveHAlign();
        if (rightToLeftText) {
            if (horizontalAlignment == QQuickText::AlignLeft)
                horizontalAlignment = QQuickText::AlignRight;
            else if (horizontalAlignment == QQuickText::AlignRight)
                horizontalAlignment = QQuickText::AlignLeft;
        }
        QTextOption option;
        option.setAlignment((Qt::Alignment)int(horizontalAlignment | vAlign));
        option.setWrapMode(QTextOption::WrapMode(wrapMode));
        option.setUseDesignMetrics(renderType != QQuickText::NativeRendering);
        extra->doc->setDefaultTextOption(option);
        qreal naturalWidth = 0;
        if (requireImplicitSize && q->widthValid()) {
            extra->doc->setTextWidth(-1);
            naturalWidth = extra->doc->idealWidth();
            const bool wasInLayout = internalWidthUpdate;
            internalWidthUpdate = true;
            q->setImplicitWidth(naturalWidth + hPadding);
            internalWidthUpdate = wasInLayout;
        }
        if (internalWidthUpdate)
            return;
 
        extra->doc->setPageSize(QSizeF(q->width(), -1));
        if (q->widthValid() && (wrapMode != QQuickText::NoWrap || extra->doc->idealWidth() < availableWidth()))
            extra->doc->setTextWidth(availableWidth());
        else
            extra->doc->setTextWidth(extra->doc->idealWidth()); // ### Text does not align if width is not set (QTextDoc bug)
 
        QSizeF dsize = extra->doc->size();
        layedOutTextRect = QRectF(QPointF(0,0), dsize);
        size = QSizeF(extra->doc->idealWidth(),dsize.height());
 
 
        qreal baseline = QFontMetricsF(font).ascent();
        QTextBlock firstBlock = extra->doc->firstBlock();
        if (firstBlock.isValid() && firstBlock.layout() != nullptr && firstBlock.lineCount() > 0)
            baseline = firstBlock.layout()->lineAt(0).ascent();
 
        updateBaseline(baseline, q->height() - size.height() - vPadding);
 
        //### need to confirm cost of always setting these for richText
        internalWidthUpdate = true;
        qreal oldWidth = q->width();
        qreal iWidth = -1;
        if (!q->widthValid())
            iWidth = size.width();
        if (iWidth > -1)
            q->setImplicitSize(iWidth + hPadding, size.height() + qMax(lineHeightOffset(), 0) + vPadding);
        internalWidthUpdate = false;
 
        // If the implicit width update caused a recursive change of the width,
        // we will have skipped integral parts of the layout due to the
        // internalWidthUpdate recursion guard. To make sure everything is up
        // to date, we need to run a second pass over the layout when updateSize()
        // is done.
        if (!qFuzzyCompare(q->width(), oldWidth) && !updateSizeRecursionGuard) {
            updateSizeRecursionGuard = true;
            updateSize();
            updateSizeRecursionGuard = false;
        } else {
            if (iWidth == -1)
                q->setImplicitHeight(size.height() + lineHeightOffset() + vPadding);
 
            QTextBlock firstBlock = extra->doc->firstBlock();
            while (firstBlock.layout()->lineCount() == 0)
                firstBlock = firstBlock.next();
 
            QTextBlock lastBlock = extra->doc->lastBlock();
            while (lastBlock.layout()->lineCount() == 0)
                lastBlock = lastBlock.previous();
 
            if (firstBlock.lineCount() > 0 && lastBlock.lineCount() > 0) {
                QTextLine firstLine = firstBlock.layout()->lineAt(0);
                QTextLine lastLine = lastBlock.layout()->lineAt(lastBlock.layout()->lineCount() - 1);
                advance = QSizeF(lastLine.horizontalAdvance(),
                                 (lastLine.y() + lastBlock.layout()->position().y() + lastLine.ascent()) - (firstLine.y() + firstBlock.layout()->position().y() + firstLine.ascent()));
            } else {
                advance = QSizeF();
            }
        }
    }
 
    signalSizeChange(previousSize);
    updateType = UpdatePaintNode;
    q->update();
}
 
QQuickTextLine::QQuickTextLine()
    : QObject(), m_line(nullptr), m_height(0), m_lineOffset(0)
{
}
 
void QQuickTextLine::setLine(QTextLine *line)
{
    m_line = line;
}
 
void QQuickTextLine::setLineOffset(int offset)
{
    m_lineOffset = offset;
}
 
void QQuickTextLine::setFullLayoutTextLength(int length)
{
    m_fullLayoutTextLength = length;
}
 
int QQuickTextLine::number() const
{
    if (m_line)
        return m_line->lineNumber() + m_lineOffset;
    return 0;
}
 
qreal QQuickTextLine::implicitWidth() const
{
    if (m_line)
        return m_line->naturalTextWidth();
    return 0;
}
 
bool QQuickTextLine::isLast() const
{
    if (m_line && (m_line->textStart() + m_line->textLength()) == m_fullLayoutTextLength) {
        // Ensure that isLast will change if the user reduced the width of the line
        // so that the text no longer fits.
        return m_line->width() >= m_line->naturalTextWidth();
    }
 
    return false;
}
 
qreal QQuickTextLine::width() const
{
    if (m_line)
        return m_line->width();
    return 0;
}
 
void QQuickTextLine::setWidth(qreal width)
{
    if (m_line)
        m_line->setLineWidth(width);
}
 
qreal QQuickTextLine::height() const
{
    if (m_height)
        return m_height;
    if (m_line)
        return m_line->height();
    return 0;
}
 
void QQuickTextLine::setHeight(qreal height)
{
    if (m_line)
        m_line->setPosition(QPointF(m_line->x(), m_line->y() - m_line->height() + height));
    m_height = height;
}
 
qreal QQuickTextLine::x() const
{
    if (m_line)
        return m_line->x();
    return 0;
}
 
void QQuickTextLine::setX(qreal x)
{
    if (m_line)
        m_line->setPosition(QPointF(x, m_line->y()));
}
 
qreal QQuickTextLine::y() const
{
    if (m_line)
        return m_line->y();
    return 0;
}
 
void QQuickTextLine::setY(qreal y)
{
    if (m_line)
        m_line->setPosition(QPointF(m_line->x(), y));
}
 
bool QQuickTextPrivate::isLineLaidOutConnected()
{
    Q_Q(QQuickText);
    IS_SIGNAL_CONNECTED(q, QQuickText, lineLaidOut, (QQuickTextLine *));
}
 
void QQuickTextPrivate::setupCustomLineGeometry(QTextLine &line, qreal &height, int fullLayoutTextLength, int lineOffset)
{
    Q_Q(QQuickText);
 
    if (!textLine)
        textLine.reset(new QQuickTextLine);
    textLine->setFullLayoutTextLength(fullLayoutTextLength);
    textLine->setLine(&line);
    textLine->setY(height);
    textLine->setHeight(0);
    textLine->setLineOffset(lineOffset);
 
    // use the text item's width by default if it has one and wrap is on or text must be aligned
    if (q->widthValid() && (q->wrapMode() != QQuickText::NoWrap ||
                            q->effectiveHAlign() != QQuickText::AlignLeft))
        textLine->setWidth(availableWidth());
    else
        textLine->setWidth(INT_MAX);
    if (lineHeight() != 1.0)
        textLine->setHeight((lineHeightMode() == QQuickText::FixedHeight) ? lineHeight() : line.height() * lineHeight());
 
    emit q->lineLaidOut(textLine.get());
 
    height += textLine->height();
}
 
void QQuickTextPrivate::elideFormats(
        const int start, const int length, int offset, QVector<QTextLayout::FormatRange> *elidedFormats)
{
    const int end = start + length;
    const QVector<QTextLayout::FormatRange> formats = layout.formats();
    for (int i = 0; i < formats.size(); ++i) {
        QTextLayout::FormatRange format = formats.at(i);
        const int formatLength = qMin(format.start + format.length, end) - qMax(format.start, start);
        if (formatLength > 0) {
            format.start = qMax(offset, format.start - start + offset);
            format.length = formatLength;
            elidedFormats->append(format);
        }
    }
}
 
QString QQuickTextPrivate::elidedText(qreal lineWidth, const QTextLine &line, const QTextLine *nextLine) const
{
    if (nextLine) {
        return layout.engine()->elidedText(
                Qt::TextElideMode(elideMode),
                QFixed::fromReal(lineWidth),
                0,
                line.textStart(),
                line.textLength() + nextLine->textLength());
    } else {
        QString elideText = layout.text().mid(line.textStart(), line.textLength());
        if (!styledText) {
            // QFontMetrics won't help eliding styled text.
            elideText[elideText.size() - 1] = elideChar;
            // Appending the elide character may push the line over the maximum width
            // in which case the elided text will need to be elided.
            QFontMetricsF metrics(layout.font());
            if (metrics.horizontalAdvance(elideChar) + line.naturalTextWidth() >= lineWidth)
                elideText = metrics.elidedText(elideText, Qt::TextElideMode(elideMode), lineWidth);
        }
        return elideText;
    }
}
 
void QQuickTextPrivate::clearFormats()
{
    layout.clearFormats();
    if (elideLayout)
        elideLayout->clearFormats();
}
 
QRectF QQuickTextPrivate::setupTextLayout(qreal *const baseline)
{
    Q_Q(QQuickText);
 
    bool singlelineElide = elideMode != QQuickText::ElideNone && q->widthValid();
    bool multilineElide = elideMode == QQuickText::ElideRight
            && q->widthValid()
            && (q->heightValid() || maximumLineCountValid);
 
    if ((!requireImplicitSize || (implicitWidthValid && implicitHeightValid))
            && ((singlelineElide && availableWidth() <= 0.)
                || (multilineElide && q->heightValid() && availableHeight() <= 0.))) {
        // we are elided and we have a zero width or height
        widthExceeded = q->widthValid() && availableWidth() <= 0.;
        heightExceeded = q->heightValid() && availableHeight() <= 0.;
 
        if (!truncated) {
            truncated = true;
            emit q->truncatedChanged();
        }
        if (lineCount) {
            lineCount = 0;
            q->setFlag(QQuickItem::ItemObservesViewport, false);
            emit q->lineCountChanged();
        }
 
        if (qFuzzyIsNull(q->width())) {
            layout.setText(QString());
            textHasChanged = true;
        }
 
        QFontMetricsF fm(font);
        qreal height = (lineHeightMode() == QQuickText::FixedHeight) ? lineHeight() : qCeil(fm.height()) * lineHeight();
        *baseline = fm.ascent();
        return QRectF(0, 0, 0, height);
    }
 
    bool shouldUseDesignMetrics = renderType != QQuickText::NativeRendering;
    if (extra.isAllocated())
        extra->visibleImgTags.clear();
    layout.setCacheEnabled(true);
    QTextOption textOption = layout.textOption();
    if (textOption.alignment() != q->effectiveHAlign()
            || textOption.wrapMode() != QTextOption::WrapMode(wrapMode)
            || textOption.useDesignMetrics() != shouldUseDesignMetrics) {
        textOption.setAlignment(Qt::Alignment(q->effectiveHAlign()));
        textOption.setWrapMode(QTextOption::WrapMode(wrapMode));
        textOption.setUseDesignMetrics(shouldUseDesignMetrics);
        layout.setTextOption(textOption);
    }
    if (layout.font() != font)
        layout.setFont(font);
 
    lineWidth = (q->widthValid() || implicitWidthValid) && q->width() > 0
            ? q->width()
            : FLT_MAX;
    qreal maxHeight = q->heightValid() ? availableHeight() : FLT_MAX;
 
    const bool customLayout = isLineLaidOutConnected();
    const bool wasTruncated = truncated;
 
    bool canWrap = wrapMode != QQuickText::NoWrap && q->widthValid();
 
    bool horizontalFit = fontSizeMode() & QQuickText::HorizontalFit && q->widthValid();
    bool verticalFit = fontSizeMode() & QQuickText::VerticalFit
            && (q->heightValid() || (maximumLineCountValid && canWrap));
 
    const bool pixelSize = font.pixelSize() != -1;
    QString layoutText = layout.text();
 
    const qreal minimumSize = pixelSize
                            ? static_cast<qreal>(minimumPixelSize())
                            : minimumPointSize();
    qreal largeFont = pixelSize ? font.pixelSize() : font.pointSizeF();
    qreal smallFont = fontSizeMode() != QQuickText::FixedSize
                    ? qMin<qreal>(minimumSize, largeFont)
                    : largeFont;
    qreal scaledFontSize = largeFont;
    const qreal sizeFittingThreshold(0.01);
 
    bool widthChanged = false;
    widthExceeded = availableWidth() <= 0 && (singlelineElide || canWrap || horizontalFit);
    heightExceeded = availableHeight() <= 0 && (multilineElide || verticalFit);
 
    QRectF br;
 
    QFont scaledFont = font;
 
    int visibleCount = 0;
    bool elide;
    qreal height = 0;
    QString elideText;
    bool once = true;
    int elideStart = 0;
    int elideEnd = 0;
    bool noBreakLastLine = multilineElide && (wrapMode == QQuickText::Wrap || wrapMode == QQuickText::WordWrap);
 
    int eos = multilengthEos;
 
    // Repeated layouts with reduced font sizes or abbreviated strings may be required if the text
    // doesn't fit within the item dimensions,  or a binding to implicitWidth/Height changes
    // the item dimensions.
    for (;;) {
        if (!once) {
            if (pixelSize)
                scaledFont.setPixelSize(scaledFontSize);
            else
                scaledFont.setPointSizeF(scaledFontSize);
            if (layout.font() != scaledFont)
                layout.setFont(scaledFont);
        }
 
        layout.beginLayout();
 
        bool wrapped = false;
        bool truncateHeight = false;
        truncated = false;
        elide = false;
        int unwrappedLineCount = 1;
        const int maxLineCount = maximumLineCount();
        height = 0;
        qreal naturalHeight = 0;
        qreal previousHeight = 0;
        br = QRectF();
 
        QRectF unelidedRect;
        QTextLine line;
        for (visibleCount = 1; ; ++visibleCount) {
            line = layout.createLine();
 
            if (noBreakLastLine && visibleCount == maxLineCount)
                layout.engine()->option.setWrapMode(QTextOption::WrapAnywhere);
            if (customLayout) {
                setupCustomLineGeometry(line, naturalHeight, layoutText.size());
            } else {
                setLineGeometry(line, lineWidth, naturalHeight);
            }
            if (noBreakLastLine && visibleCount == maxLineCount)
                layout.engine()->option.setWrapMode(QTextOption::WrapMode(wrapMode));
 
            unelidedRect = br.united(line.naturalTextRect());
 
            // Elide the previous line if the accumulated height of the text exceeds the height
            // of the element.
            if (multilineElide && naturalHeight > maxHeight && visibleCount > 1) {
                elide = true;
                heightExceeded = true;
                if (eos != -1)  // There's an abbreviated string available, skip the rest as it's
                    break;      // all going to be discarded.
 
                truncated = true;
                truncateHeight = true;
 
                visibleCount -= 1;
 
                const QTextLine previousLine = layout.lineAt(visibleCount - 1);
                elideText = layoutText.at(line.textStart() - 1) != QChar::LineSeparator
                        ? elidedText(line.width(), previousLine, &line)
                        : elidedText(line.width(), previousLine);
                elideStart = previousLine.textStart();
                // elideEnd isn't required for right eliding.
 
                height = previousHeight;
                break;
            }
 
            const bool isLastLine = line.textStart() + line.textLength() >= layoutText.size();
            if (isLastLine) {
                if (singlelineElide && visibleCount == 1 && line.naturalTextWidth() > line.width()) {
                    // Elide a single previousLine of text if its width exceeds the element width.
                    elide = true;
                    widthExceeded = true;
                    if (eos != -1) // There's an abbreviated string available.
                        break;
 
                    truncated = true;
                    elideText = layout.engine()->elidedText(
                            Qt::TextElideMode(elideMode),
                            QFixed::fromReal(line.width()),
                            0,
                            line.textStart(),
                            line.textLength());
                    elideStart = line.textStart();
                    elideEnd = elideStart + line.textLength();
                } else {
                    br = unelidedRect;
                    height = naturalHeight;
                }
                break;
            } else {
                const bool wrappedLine = layoutText.at(line.textStart() + line.textLength() - 1) != QChar::LineSeparator;
                wrapped |= wrappedLine;
 
                if (!wrappedLine)
                    ++unwrappedLineCount;
 
                // Stop if the maximum number of lines has been reached
                if (visibleCount == maxLineCount) {
                    truncated = true;
                    heightExceeded |= wrapped;
 
                    if (multilineElide) {
                        elide = true;
                        if (eos != -1)  // There's an abbreviated string available
                            break;
 
                        const QTextLine nextLine = layout.createLine();
                        elideText = wrappedLine
                                ? elidedText(line.width(), line, &nextLine)
                                : elidedText(line.width(), line);
                        elideStart = line.textStart();
                        // elideEnd isn't required for right eliding.
                    } else {
                        br = unelidedRect;
                        height = naturalHeight;
                    }
                    break;
                }
            }
            br = unelidedRect;
            previousHeight = height;
            height = naturalHeight;
        }
        widthExceeded |= wrapped;
 
        // Save the implicit size of the text on the first layout only.
        if (once) {
            once = false;
 
            // If implicit sizes are required layout any additional lines up to the maximum line
            // count.
            if ((requireImplicitSize) && line.isValid() && unwrappedLineCount < maxLineCount) {
                // Layout the remainder of the wrapped lines up to maxLineCount to get the implicit
                // height.
                for (int lineCount = layout.lineCount(); lineCount < maxLineCount; ++lineCount) {
                    line = layout.createLine();
                    if (!line.isValid())
                        break;
                    if (layoutText.at(line.textStart() - 1) == QChar::LineSeparator)
                        ++unwrappedLineCount;
                    setLineGeometry(line, lineWidth, naturalHeight);
                }
 
                // Create the remainder of the unwrapped lines up to maxLineCount to get the
                // implicit width.
                const int eol = line.isValid()
                        ? line.textStart() + line.textLength()
                        : layoutText.size();
                if (eol < layoutText.size() && layoutText.at(eol) != QChar::LineSeparator)
                    line = layout.createLine();
                for (; line.isValid() && unwrappedLineCount <= maxLineCount; ++unwrappedLineCount)
                    line = layout.createLine();
            }
            layout.endLayout();
 
            const qreal naturalWidth = layout.maximumWidth();
 
            bool wasInLayout = internalWidthUpdate;
            internalWidthUpdate = true;
            q->setImplicitSize(naturalWidth + q->leftPadding() + q->rightPadding(), naturalHeight + qMax(lineHeightOffset(), 0) + q->topPadding() + q->bottomPadding());
            internalWidthUpdate = wasInLayout;
 
            // Update any variables that are dependent on the validity of the width or height.
            singlelineElide = elideMode != QQuickText::ElideNone && q->widthValid();
            multilineElide = elideMode == QQuickText::ElideRight
                    && q->widthValid()
                    && (q->heightValid() || maximumLineCountValid);
            canWrap = wrapMode != QQuickText::NoWrap && q->widthValid();
 
            horizontalFit = fontSizeMode() & QQuickText::HorizontalFit && q->widthValid();
            verticalFit = fontSizeMode() & QQuickText::VerticalFit
                    && (q->heightValid() || (maximumLineCountValid && canWrap));
 
            const qreal oldWidth = lineWidth;
            const qreal oldHeight = maxHeight;
 
            const qreal availWidth = availableWidth();
            const qreal availHeight = availableHeight();
 
            lineWidth = q->widthValid() && q->width() > 0 ? availWidth : naturalWidth;
            maxHeight = q->heightValid() ? availHeight : FLT_MAX;
 
            // If the width of the item has changed and it's possible the result of wrapping,
            // eliding, scaling has changed, or the text is not left aligned do another layout.
            if ((!qFuzzyCompare(lineWidth, oldWidth) || (widthExceeded && lineWidth > oldWidth))
                    && (singlelineElide || multilineElide || canWrap || horizontalFit
                        || q->effectiveHAlign() != QQuickText::AlignLeft)) {
                widthChanged = true;
                widthExceeded = lineWidth >= qMin(oldWidth, naturalWidth);
                heightExceeded = false;
                continue;
            }
 
            // If the height of the item has changed and it's possible the result of eliding,
            // line count truncation or scaling has changed, do another layout.
            if ((maxHeight < qMin(oldHeight, naturalHeight) || (heightExceeded && maxHeight > oldHeight))
                    && (multilineElide || (canWrap && maximumLineCountValid))) {
                widthExceeded = false;
                heightExceeded = false;
                continue;
            }
 
            // If the horizontal alignment is not left and the width was not valid we need to relayout
            // now that we know the maximum line width.
            if (!q->widthValid() && !implicitWidthValid && unwrappedLineCount > 1 && q->effectiveHAlign() != QQuickText::AlignLeft) {
                widthExceeded = false;
                heightExceeded = false;
                continue;
            }
        } else if (widthChanged) {
            widthChanged = false;
            if (line.isValid()) {
                for (int lineCount = layout.lineCount(); lineCount < maxLineCount; ++lineCount) {
                    line = layout.createLine();
                    if (!line.isValid())
                        break;
                    setLineGeometry(line, lineWidth, naturalHeight);
                }
            }
            layout.endLayout();
 
            bool wasInLayout = internalWidthUpdate;
            internalWidthUpdate = true;
            q->setImplicitHeight(naturalHeight + qMax(lineHeightOffset(), 0) + q->topPadding() + q->bottomPadding());
            internalWidthUpdate = wasInLayout;
 
            multilineElide = elideMode == QQuickText::ElideRight
                    && q->widthValid()
                    && (q->heightValid() || maximumLineCountValid);
            verticalFit = fontSizeMode() & QQuickText::VerticalFit
                    && (q->heightValid() || (maximumLineCountValid && canWrap));
 
            const qreal oldHeight = maxHeight;
            maxHeight = q->heightValid() ? availableHeight() : FLT_MAX;
            // If the height of the item has changed and it's possible the result of eliding,
            // line count truncation or scaling has changed, do another layout.
            if ((maxHeight < qMin(oldHeight, naturalHeight) || (heightExceeded && maxHeight > oldHeight))
                    && (multilineElide || (canWrap && maximumLineCountValid))) {
                widthExceeded = false;
                heightExceeded = false;
                continue;
            }
        } else {
            layout.endLayout();
        }
 
        // If the next needs to be elided and there's an abbreviated string available
        // go back and do another layout with the abbreviated string.
        if (eos != -1 && elide) {
            int start = eos + 1;
            eos = text.indexOf(QLatin1Char('\x9c'),  start);
            layoutText = text.mid(start, eos != -1 ? eos - start : -1);
            layoutText.replace(QLatin1Char('\n'), QChar::LineSeparator);
            layout.setText(layoutText);
            textHasChanged = true;
            continue;
        }
 
        br.moveTop(0);
 
        // Find the advance of the text layout
        if (layout.lineCount() > 0) {
            QTextLine firstLine = layout.lineAt(0);
            QTextLine lastLine = layout.lineAt(layout.lineCount() - 1);
            advance = QSizeF(lastLine.horizontalAdvance(),
                             lastLine.y() - firstLine.y());
        } else {
            advance = QSizeF();
        }
 
        if (!horizontalFit && !verticalFit)
            break;
 
        // Can't find a better fit
        if (qFuzzyCompare(smallFont, largeFont))
            break;
 
        // Try and find a font size that better fits the dimensions of the element.
        if (horizontalFit) {
            if (unelidedRect.width() > lineWidth || (!verticalFit && wrapped)) {
                widthExceeded = true;
                largeFont = scaledFontSize;
 
                scaledFontSize = (smallFont + largeFont) / 2;
 
                continue;
            } else if (!verticalFit) {
                smallFont = scaledFontSize;
 
                // Check to see if the current scaledFontSize is acceptable
                if ((largeFont - smallFont) < sizeFittingThreshold)
                    break;
 
                scaledFontSize = (smallFont + largeFont) / 2;
            }
        }
 
        if (verticalFit) {
            if (truncateHeight || unelidedRect.height() > maxHeight) {
                heightExceeded = true;
                largeFont = scaledFontSize;
 
                scaledFontSize = (smallFont + largeFont) / 2;
 
            } else {
                smallFont = scaledFontSize;
 
                // Check to see if the current scaledFontSize is acceptable
                if ((largeFont - smallFont) < sizeFittingThreshold)
                    break;
 
                scaledFontSize = (smallFont + largeFont) / 2;
            }
        }
    }
 
    implicitWidthValid = true;
    implicitHeightValid = true;
 
    QFontInfo scaledFontInfo(scaledFont);
    if (fontInfo.weight() != scaledFontInfo.weight()
            || fontInfo.pixelSize() != scaledFontInfo.pixelSize()
            || fontInfo.italic() != scaledFontInfo.italic()
            || !qFuzzyCompare(fontInfo.pointSizeF(), scaledFontInfo.pointSizeF())
            || fontInfo.family() != scaledFontInfo.family()
            || fontInfo.styleName() != scaledFontInfo.styleName()) {
        fontInfo = scaledFontInfo;
        emit q->fontInfoChanged();
    }
 
    if (eos != multilengthEos)
        truncated = true;
 
    assignedFont = QFontInfo(font).family();
 
    if (elide) {
        if (!elideLayout) {
            elideLayout.reset(new QTextLayout);
            elideLayout->setCacheEnabled(true);
        }
        QTextEngine *engine = layout.engine();
        if (engine && engine->hasFormats()) {
            QVector<QTextLayout::FormatRange> formats;
            switch (elideMode) {
            case QQuickText::ElideRight:
                elideFormats(elideStart, elideText.size() - 1, 0, &formats);
                break;
            case QQuickText::ElideLeft:
                elideFormats(elideEnd - elideText.size() + 1, elideText.size() - 1, 1, &formats);
                break;
            case QQuickText::ElideMiddle: {
                const int index = elideText.indexOf(elideChar);
                if (index != -1) {
                    elideFormats(elideStart, index, 0, &formats);
                    elideFormats(
                            elideEnd - elideText.size() + index + 1,
                            elideText.size() - index - 1,
                            index + 1,
                            &formats);
                }
                break;
            }
            default:
                break;
            }
            elideLayout->setFormats(formats);
        }
 
        elideLayout->setFont(layout.font());
        elideLayout->setTextOption(layout.textOption());
        elideLayout->setText(elideText);
        elideLayout->beginLayout();
 
        QTextLine elidedLine = elideLayout->createLine();
        elidedLine.setPosition(QPointF(0, height));
        if (customLayout) {
            setupCustomLineGeometry(elidedLine, height, elideText.size(), visibleCount - 1);
        } else {
            setLineGeometry(elidedLine, lineWidth, height);
        }
        elideLayout->endLayout();
 
        br = br.united(elidedLine.naturalTextRect());
 
        if (visibleCount == 1)
            layout.clearLayout();
    } else {
        elideLayout.reset();
    }
 
    QTextLine firstLine = visibleCount == 1 && elideLayout
            ? elideLayout->lineAt(0)
            : layout.lineAt(0);
    if (firstLine.isValid())
        *baseline = firstLine.y() + firstLine.ascent();
 
    if (!customLayout)
        br.setHeight(height);
 
    //Update the number of visible lines
    if (lineCount != visibleCount) {
        lineCount = visibleCount;
        emit q->lineCountChanged();
    }
 
    if (truncated != wasTruncated)
        emit q->truncatedChanged();
 
    return br;
}
 
void QQuickTextPrivate::setLineGeometry(QTextLine &line, qreal lineWidth, qreal &height)
{
    Q_Q(QQuickText);
    line.setLineWidth(lineWidth);
 
    if (extra.isAllocated() && extra->imgTags.isEmpty()) {
        line.setPosition(QPointF(line.position().x(), height));
        height += (lineHeightMode() == QQuickText::FixedHeight) ? lineHeight() : line.height() * lineHeight();
        return;
    }
 
    qreal textTop = 0;
    qreal textHeight = line.height();
    qreal totalLineHeight = textHeight;
 
    QList<QQuickStyledTextImgTag *> imagesInLine;
 
    if (extra.isAllocated()) {
        for (QQuickStyledTextImgTag *image : std::as_const(extra->imgTags)) {
            if (image->position >= line.textStart() &&
                image->position < line.textStart() + line.textLength()) {
 
                if (!image->pix) {
                    const QQmlContext *context = qmlContext(q);
                    const QUrl url = context->resolvedUrl(q->baseUrl()).resolved(image->url);
                    image->pix.reset(new QQuickPixmap(context->engine(), url, QRect(), image->size * devicePixelRatio()));
 
                    if (image->pix->isLoading()) {
                        image->pix->connectFinished(q, SLOT(imageDownloadFinished()));
                    } else if (image->pix->isReady()) {
                        if (!image->size.isValid()) {
                            image->size = image->pix->implicitSize();
                            // if the size of the image was not explicitly set, we need to
                            // call updateLayout() once again.
                            needToUpdateLayout = true;
                        }
                    } else if (image->pix->isError()) {
                        qmlWarning(q) << image->pix->error();
                    }
                }
 
                qreal ih = qreal(image->size.height());
                if (image->align == QQuickStyledTextImgTag::Top)
                    image->pos.setY(0);
                else if (image->align == QQuickStyledTextImgTag::Middle)
                    image->pos.setY((textHeight / 2.0) - (ih / 2.0));
                else
                    image->pos.setY(textHeight - ih);
                imagesInLine << image;
                textTop = qMax(textTop, qAbs(image->pos.y()));
            }
        }
    }
 
    for (QQuickStyledTextImgTag *image : std::as_const(imagesInLine)) {
        totalLineHeight = qMax(totalLineHeight, textTop + image->pos.y() + image->size.height());
        const int leadX = line.cursorToX(image->position);
        const int trailX = line.cursorToX(image->position, QTextLine::Trailing);
        const bool rtl = trailX < leadX;
        image->pos.setX(leadX + (rtl ? (-image->offset - image->size.width()) : image->offset));
        image->pos.setY(image->pos.y() + height + textTop);
        extra->visibleImgTags << image;
    }
 
    line.setPosition(QPointF(line.position().x(), height + textTop));
    height += (lineHeightMode() == QQuickText::FixedHeight) ? lineHeight() : totalLineHeight * lineHeight();
}
 
int QQuickTextPrivate::lineHeightOffset() const
{
    QFontMetricsF fm(font);
    qreal fontHeight = qCeil(fm.height());  // QScriptLine and therefore QTextLine rounds up
    return lineHeightMode() == QQuickText::FixedHeight ? fontHeight - lineHeight()
                                                       : (1.0 - lineHeight()) * fontHeight;
}
 
void QQuickTextPrivate::ensureDoc()
{
    if (!extra.isAllocated() || !extra->doc) {
        Q_Q(QQuickText);
        extra.value().doc = new QTextDocument(q);
        auto *doc = extra->doc;
        extra->imageHandler = new QQuickTextImageHandler(doc);
        doc->documentLayout()->registerHandler(QTextFormat::ImageObject, extra->imageHandler);
        doc->setPageSize(QSizeF(0, 0));
        doc->setDocumentMargin(0);
        const QQmlContext *context = qmlContext(q);
        doc->setBaseUrl(context ? context->resolvedUrl(q->baseUrl()) : q->baseUrl());
    }
}
 
void QQuickTextPrivate::updateDocumentText()
{
    ensureDoc();
#if QT_CONFIG(textmarkdownreader)
    if (markdownText)
        extra->doc->setMarkdown(text);
    else
#endif
#if QT_CONFIG(texthtmlparser)
        extra->doc->setHtml(text);
#else
        extra->doc->setPlainText(text);
#endif
    rightToLeftText = extra->doc->toPlainText().isRightToLeft();
}
 
qreal QQuickTextPrivate::devicePixelRatio() const
{
    return (window ? window->effectiveDevicePixelRatio() : qApp->devicePixelRatio());
}
 
QQuickText::QQuickText(QQuickItem *parent)
: QQuickImplicitSizeItem(*(new QQuickTextPrivate), parent)
{
    Q_D(QQuickText);
    d->init();
}
 
QQuickText::QQuickText(QQuickTextPrivate &dd, QQuickItem *parent)
: QQuickImplicitSizeItem(dd, parent)
{
    Q_D(QQuickText);
    d->init();
}
 
QQuickText::~QQuickText()
{
    Q_D(QQuickText);
    if (d->extra.isAllocated()) {
        qDeleteAll(d->extra->pixmapsInProgress);
        d->extra->pixmapsInProgress.clear();
    }
}
 
 
 
 
 
 
 
QFont QQuickText::font() const
{
    Q_D(const QQuickText);
    return d->sourceFont;
}
 
void QQuickText::setFont(const QFont &font)
{
    Q_D(QQuickText);
    if (d->sourceFont == font)
        return;
 
    d->sourceFont = font;
    QFont oldFont = d->font;
    d->font = font;
 
    if (!antialiasing())
        d->font.setStyleStrategy(QFont::NoAntialias);
 
    if (d->font.pointSizeF() != -1) {
        // 0.5pt resolution
        qreal size = qRound(d->font.pointSizeF()*2.0);
        d->font.setPointSizeF(size/2.0);
    }
 
    if (oldFont != d->font) {
        // if the format changes the size of the text
        // with headings or <font> tag, we need to re-parse
        if (d->formatModifiesFontSize)
            d->textHasChanged = true;
        d->implicitWidthValid = false;
        d->implicitHeightValid = false;
        d->updateLayout();
    }
 
    emit fontChanged(d->sourceFont);
}
 
void QQuickText::itemChange(ItemChange change, const ItemChangeData &value)
{
    Q_D(QQuickText);
    Q_UNUSED(value);
    switch (change) {
    case ItemAntialiasingHasChanged:
        if (!antialiasing())
            d->font.setStyleStrategy(QFont::NoAntialias);
        else
            d->font.setStyleStrategy(QFont::PreferAntialias);
        d->implicitWidthValid = false;
        d->implicitHeightValid = false;
        d->updateLayout();
        break;
 
    case ItemDevicePixelRatioHasChanged:
        {
            bool needUpdateLayout = false;
            if (d->renderType == NativeRendering) {
                // Native rendering optimizes for a given pixel grid, so its results must not be scaled.
                // Text layout code respects the current device pixel ratio automatically, we only need
                // to rerun layout after the ratio changed.
                // Changes of implicit size should be minimal; they are hard to avoid.
                d->implicitWidthValid = false;
                d->implicitHeightValid = false;
                needUpdateLayout = true;
            }
 
            if (d->extra.isAllocated()) {
                // check if we have scalable inline images with explicit size set, which should be reloaded
                for (QQuickStyledTextImgTag *image : std::as_const(d->extra->visibleImgTags)) {
                    if (image->size.isValid() && QQuickPixmap::isScalableImageFormat(image->url)) {
                        image->pix.reset();
                        needUpdateLayout = true;
                    }
                }
            }
 
            if (needUpdateLayout)
                d->updateLayout();
        }
        break;
 
    default:
        break;
    }
    QQuickItem::itemChange(change, value);
}
 
QString QQuickText::text() const
{
    Q_D(const QQuickText);
    return d->text;
}
 
void QQuickText::setText(const QString &n)
{
    Q_D(QQuickText);
    if (d->text == n)
        return;
 
    d->markdownText = d->format == MarkdownText;
    d->richText = d->format == RichText || d->markdownText;
    d->styledText = d->format == StyledText || (d->format == AutoText && Qt::mightBeRichText(n));
    d->text = n;
    if (isComponentComplete()) {
        if (d->richText) {
            d->updateDocumentText();
        } else {
            d->clearFormats();
            d->rightToLeftText = d->text.isRightToLeft();
        }
        d->determineHorizontalAlignment();
    }
    d->textHasChanged = true;
    d->implicitWidthValid = false;
    d->implicitHeightValid = false;
 
    if (d->extra.isAllocated()) {
        qDeleteAll(d->extra->imgTags);
        d->extra->imgTags.clear();
    }
    setFlag(QQuickItem::ItemObservesViewport, n.size() > QQuickTextPrivate::largeTextSizeThreshold);
    d->updateLayout();
    setAcceptHoverEvents(d->richText || d->styledText);
    emit textChanged(d->text);
}
 
QColor QQuickText::color() const
{
    Q_D(const QQuickText);
    return QColor::fromRgba(d->color);
}
 
void QQuickText::setColor(const QColor &color)
{
    Q_D(QQuickText);
    QRgb rgb = color.rgba();
    if (d->color == rgb)
        return;
 
    d->color = rgb;
    if (isComponentComplete())  {
        d->updateType = QQuickTextPrivate::UpdatePaintNode;
        update();
    }
    emit colorChanged();
}
 
QColor QQuickText::linkColor() const
{
    Q_D(const QQuickText);
    return QColor::fromRgba(d->linkColor);
}
 
void QQuickText::setLinkColor(const QColor &color)
{
    Q_D(QQuickText);
    QRgb rgb = color.rgba();
    if (d->linkColor == rgb)
        return;
 
    d->linkColor = rgb;
    if (isComponentComplete()) {
        d->updateType = QQuickTextPrivate::UpdatePaintNode;
        update();
    }
    emit linkColorChanged();
}
 
QQuickText::TextStyle QQuickText::style() const
{
    Q_D(const QQuickText);
    return d->style;
}
 
void QQuickText::setStyle(QQuickText::TextStyle style)
{
    Q_D(QQuickText);
    if (d->style == style)
        return;
 
    d->style = style;
    if (isComponentComplete()) {
        d->updateType = QQuickTextPrivate::UpdatePaintNode;
        update();
    }
    emit styleChanged(d->style);
}
 
QColor QQuickText::styleColor() const
{
    Q_D(const QQuickText);
    return QColor::fromRgba(d->styleColor);
}
 
void QQuickText::setStyleColor(const QColor &color)
{
    Q_D(QQuickText);
    QRgb rgb = color.rgba();
    if (d->styleColor == rgb)
        return;
 
    d->styleColor = rgb;
    if (isComponentComplete()) {
        d->updateType = QQuickTextPrivate::UpdatePaintNode;
        update();
    }
    emit styleColorChanged();
}
 
QQuickText::HAlignment QQuickText::hAlign() const
{
    Q_D(const QQuickText);
    return d->hAlign;
}
 
void QQuickText::setHAlign(HAlignment align)
{
    Q_D(QQuickText);
    bool forceAlign = d->hAlignImplicit && d->effectiveLayoutMirror;
    d->hAlignImplicit = false;
    if (d->setHAlign(align, forceAlign) && isComponentComplete())
        d->updateLayout();
}
 
void QQuickText::resetHAlign()
{
    Q_D(QQuickText);
    d->hAlignImplicit = true;
    if (isComponentComplete() && d->determineHorizontalAlignment())
        d->updateLayout();
}
 
QQuickText::HAlignment QQuickText::effectiveHAlign() const
{
    Q_D(const QQuickText);
    QQuickText::HAlignment effectiveAlignment = d->hAlign;
    if (!d->hAlignImplicit && d->effectiveLayoutMirror) {
        switch (d->hAlign) {
        case QQuickText::AlignLeft:
            effectiveAlignment = QQuickText::AlignRight;
            break;
        case QQuickText::AlignRight:
            effectiveAlignment = QQuickText::AlignLeft;
            break;
        default:
            break;
        }
    }
    return effectiveAlignment;
}
 
bool QQuickTextPrivate::setHAlign(QQuickText::HAlignment alignment, bool forceAlign)
{
    Q_Q(QQuickText);
    if (hAlign != alignment || forceAlign) {
        QQuickText::HAlignment oldEffectiveHAlign = q->effectiveHAlign();
        hAlign = alignment;
 
        emit q->horizontalAlignmentChanged(hAlign);
        if (oldEffectiveHAlign != q->effectiveHAlign())
            emit q->effectiveHorizontalAlignmentChanged();
        return true;
    }
    return false;
}
 
bool QQuickTextPrivate::determineHorizontalAlignment()
{
    if (hAlignImplicit) {
#if QT_CONFIG(im)
        bool alignToRight = text.isEmpty() ? QGuiApplication::inputMethod()->inputDirection() == Qt::RightToLeft : rightToLeftText;
#else
        bool alignToRight = rightToLeftText;
#endif
        return setHAlign(alignToRight ? QQuickText::AlignRight : QQuickText::AlignLeft);
    }
    return false;
}
 
void QQuickTextPrivate::mirrorChange()
{
    Q_Q(QQuickText);
    if (q->isComponentComplete()) {
        if (!hAlignImplicit && (hAlign == QQuickText::AlignRight || hAlign == QQuickText::AlignLeft)) {
            updateLayout();
            emit q->effectiveHorizontalAlignmentChanged();
        }
    }
}
 
QQuickText::VAlignment QQuickText::vAlign() const
{
    Q_D(const QQuickText);
    return d->vAlign;
}
 
void QQuickText::setVAlign(VAlignment align)
{
    Q_D(QQuickText);
    if (d->vAlign == align)
        return;
 
    d->vAlign = align;
 
    if (isComponentComplete())
        d->updateLayout();
 
    emit verticalAlignmentChanged(align);
}
 
QQuickText::WrapMode QQuickText::wrapMode() const
{
    Q_D(const QQuickText);
    return d->wrapMode;
}
 
void QQuickText::setWrapMode(WrapMode mode)
{
    Q_D(QQuickText);
    if (mode == d->wrapMode)
        return;
 
    d->wrapMode = mode;
    d->updateLayout();
 
    emit wrapModeChanged();
}
 
int QQuickText::lineCount() const
{
    Q_D(const QQuickText);
    return d->lineCount;
}
 
bool QQuickText::truncated() const
{
    Q_D(const QQuickText);
    return d->truncated;
}
 
int QQuickText::maximumLineCount() const
{
    Q_D(const QQuickText);
    return d->maximumLineCount();
}
 
void QQuickText::setMaximumLineCount(int lines)
{
    Q_D(QQuickText);
 
    d->maximumLineCountValid = lines==INT_MAX ? false : true;
    if (d->maximumLineCount() != lines) {
        d->extra.value().maximumLineCount = lines;
        d->implicitHeightValid = false;
        d->updateLayout();
        emit maximumLineCountChanged();
    }
}
 
void QQuickText::resetMaximumLineCount()
{
    Q_D(QQuickText);
    setMaximumLineCount(INT_MAX);
    if (d->truncated != false) {
        d->truncated = false;
        emit truncatedChanged();
    }
}
 
QQuickText::TextFormat QQuickText::textFormat() const
{
    Q_D(const QQuickText);
    return d->format;
}
 
void QQuickText::setTextFormat(TextFormat format)
{
    Q_D(QQuickText);
    if (format == d->format)
        return;
    d->format = format;
    bool wasRich = d->richText;
    d->markdownText = format == MarkdownText;
    d->richText = format == RichText || d->markdownText;
    d->styledText = format == StyledText || (format == AutoText && Qt::mightBeRichText(d->text));
 
    if (isComponentComplete()) {
        if (!wasRich && d->richText) {
            d->updateDocumentText();
        } else {
            d->clearFormats();
            d->rightToLeftText = d->text.isRightToLeft();
            d->textHasChanged = true;
        }
        d->determineHorizontalAlignment();
    }
    d->updateLayout();
    setAcceptHoverEvents(d->richText || d->styledText);
    setAcceptedMouseButtons(d->richText || d->styledText ? Qt::LeftButton : Qt::NoButton);
 
    emit textFormatChanged(d->format);
}
 
QQuickText::TextElideMode QQuickText::elideMode() const
{
    Q_D(const QQuickText);
    return d->elideMode;
}
 
void QQuickText::setElideMode(QQuickText::TextElideMode mode)
{
    Q_D(QQuickText);
    if (mode == d->elideMode)
        return;
 
    d->elideMode = mode;
    d->updateLayout();
 
    emit elideModeChanged(mode);
}
 
QUrl QQuickText::baseUrl() const
{
    Q_D(const QQuickText);
    if (!d->extra.isAllocated() || d->extra->baseUrl.isEmpty()) {
        if (QQmlContext *context = qmlContext(this))
            return context->baseUrl();
        else
            return QUrl();
    } else {
        return d->extra->baseUrl;
    }
}
 
void QQuickText::setBaseUrl(const QUrl &url)
{
    Q_D(QQuickText);
    if (baseUrl() != url) {
        d->extra.value().baseUrl = url;
 
        if (d->richText) {
            d->ensureDoc();
            d->extra->doc->setBaseUrl(url);
        }
        if (d->styledText) {
            d->textHasChanged = true;
            if (d->extra.isAllocated()) {
                qDeleteAll(d->extra->imgTags);
                d->extra->imgTags.clear();
            }
            d->updateLayout();
        }
        emit baseUrlChanged();
    }
}
 
void QQuickText::resetBaseUrl()
{
    if (QQmlContext *context = qmlContext(this))
        setBaseUrl(context->baseUrl());
    else
        setBaseUrl(QUrl());
}
 
QRectF QQuickText::boundingRect() const
{
    Q_D(const QQuickText);
 
    QRectF rect = d->layedOutTextRect;
    rect.moveLeft(QQuickTextUtil::alignedX(rect.width(), width(), effectiveHAlign()));
    rect.moveTop(QQuickTextUtil::alignedY(rect.height() + d->lineHeightOffset(), height(), d->vAlign));
 
    if (d->style != Normal)
        rect.adjust(-1, 0, 1, 2);
    // Could include font max left/right bearings to either side of rectangle.
 
    return rect;
}
 
QRectF QQuickText::clipRect() const
{
    Q_D(const QQuickText);
 
    QRectF rect = QQuickImplicitSizeItem::clipRect();
    if (d->style != Normal)
        rect.adjust(-1, 0, 1, 2);
    return rect;
}
 
void QQuickText::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QQuickText);
    if (d->text.isEmpty()) {
        QQuickItem::geometryChange(newGeometry, oldGeometry);
        return;
    }
 
    bool widthChanged = newGeometry.width() != oldGeometry.width();
    bool heightChanged = newGeometry.height() != oldGeometry.height();
    bool wrapped = d->wrapMode != QQuickText::NoWrap;
    bool elide = d->elideMode != QQuickText::ElideNone;
    bool scaleFont = d->fontSizeMode() != QQuickText::FixedSize && (widthValid() || heightValid());
    bool verticalScale = (d->fontSizeMode() & QQuickText::VerticalFit) && heightValid();
 
    bool widthMaximum = newGeometry.width() >= oldGeometry.width() && !d->widthExceeded;
    bool heightMaximum = newGeometry.height() >= oldGeometry.height() && !d->heightExceeded;
 
    bool verticalPositionChanged = heightChanged && d->vAlign != AlignTop;
 
    if ((!widthChanged && !heightChanged) || d->internalWidthUpdate)
        goto geomChangeDone;
 
    if ((effectiveHAlign() != QQuickText::AlignLeft && widthChanged) || verticalPositionChanged) {
        // If the width has changed and we're not left aligned do an update so the text is
        // repositioned even if a full layout isn't required. And the same for vertical.
        d->updateType = QQuickTextPrivate::UpdatePaintNode;
        update();
    }
 
    if (!wrapped && !elide && !scaleFont && !verticalPositionChanged)
        goto geomChangeDone; // left aligned unwrapped text without eliding never needs relayout
 
    if (elide // eliding and dimensions were and remain invalid;
            && ((widthValid() && oldGeometry.width() <= 0 && newGeometry.width() <= 0)
            || (heightValid() && oldGeometry.height() <= 0 && newGeometry.height() <= 0))) {
        goto geomChangeDone;
    }
 
    if (widthMaximum && heightMaximum && !d->isLineLaidOutConnected() && !verticalPositionChanged)  // Size is sufficient and growing.
        goto geomChangeDone;
 
    if (!(widthChanged || widthMaximum) && !d->isLineLaidOutConnected()) { // only height has changed
        if (!verticalPositionChanged) {
            if (newGeometry.height() > oldGeometry.height()) {
                if (!d->heightExceeded && !qFuzzyIsNull(oldGeometry.height())) {
                    // Height is adequate and growing, and it wasn't 0 previously.
                    goto geomChangeDone;
                }
                if (d->lineCount == d->maximumLineCount())  // Reached maximum line and height is growing.
                    goto geomChangeDone;
            } else if (newGeometry.height() < oldGeometry.height()) {
                if (d->lineCount < 2 && !verticalScale && newGeometry.height() > 0)  // A single line won't be truncated until the text is 0 height.
                    goto geomChangeDone;
 
                if (!verticalScale // no scaling, no eliding, and either unwrapped, or no maximum line count.
                        && d->elideMode != QQuickText::ElideRight
                        && !(d->maximumLineCountValid && d->widthExceeded)) {
                    goto geomChangeDone;
                }
            }
        }
    } else if (!heightChanged && widthMaximum) {
        if (oldGeometry.width() > 0) {
            // no change to height, width is adequate and wasn't 0 before
            // (old width could also be negative if it was 0 and the margins
            // were set)
            goto geomChangeDone;
        }
    }
 
    if (d->updateOnComponentComplete || d->textHasChanged) {
        // We need to re-elide
        d->updateLayout();
    } else {
        // We just need to re-layout
        d->updateSize();
    }
 
geomChangeDone:
    QQuickItem::geometryChange(newGeometry, oldGeometry);
}
 
void QQuickText::triggerPreprocess()
{
    Q_D(QQuickText);
    if (d->updateType == QQuickTextPrivate::UpdateNone)
        d->updateType = QQuickTextPrivate::UpdatePreprocess;
    update();
}
 
QSGNode *QQuickText::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *data)
{
    Q_UNUSED(data);
    Q_D(QQuickText);
 
    if (d->text.isEmpty()) {
        delete oldNode;
        return nullptr;
    }
 
    if (d->updateType != QQuickTextPrivate::UpdatePaintNode && oldNode != nullptr) {
        // Update done in preprocess() in the nodes
        d->updateType = QQuickTextPrivate::UpdateNone;
        return oldNode;
    }
 
    d->updateType = QQuickTextPrivate::UpdateNone;
 
    const qreal dy = QQuickTextUtil::alignedY(d->layedOutTextRect.height() + d->lineHeightOffset(), d->availableHeight(), d->vAlign) + topPadding();
 
    QSGInternalTextNode *node = nullptr;
    if (!oldNode)
        node = d->sceneGraphContext()->createInternalTextNode(d->sceneGraphRenderContext());
    else
        node = static_cast<QSGInternalTextNode *>(oldNode);
 
    node->setFiltering(smooth() ? QSGTexture::Linear : QSGTexture::Nearest);
 
    node->setTextStyle(QSGTextNode::TextStyle(d->style));
    node->setRenderType(QSGTextNode::RenderType(d->renderType));
    node->setRenderTypeQuality(d->renderTypeQuality());
    node->clear();
    node->setMatrix(QMatrix4x4());
 
    node->setColor(QColor::fromRgba(d->color));
    node->setStyleColor(QColor::fromRgba(d->styleColor));
    node->setLinkColor(QColor::fromRgba(d->linkColor));
 
    if (d->richText) {
        node->setViewport(clipRect());
        const qreal dx = QQuickTextUtil::alignedX(d->layedOutTextRect.width(), d->availableWidth(), effectiveHAlign()) + leftPadding();
        d->ensureDoc();
        node->addTextDocument(QPointF(dx, dy), d->extra->doc);
    } else if (d->layedOutTextRect.width() > 0) {
        if (flags().testFlag(ItemObservesViewport))
            node->setViewport(clipRect());
        else
            node->setViewport(QRectF{});
        const qreal dx = QQuickTextUtil::alignedX(d->lineWidth, d->availableWidth(), effectiveHAlign()) + leftPadding();
        int unelidedLineCount = d->lineCount;
        if (d->elideLayout)
            unelidedLineCount -= 1;
        if (unelidedLineCount > 0)
            node->addTextLayout(QPointF(dx, dy), &d->layout, -1, -1,0, unelidedLineCount);
 
        if (d->elideLayout)
            node->addTextLayout(QPointF(dx, dy), d->elideLayout.get());
 
        if (d->extra.isAllocated()) {
            for (QQuickStyledTextImgTag *img : std::as_const(d->extra->visibleImgTags)) {
                if (img->pix && img->pix->isReady())
                    node->addImage(QRectF(img->pos.x() + dx, img->pos.y() + dy, img->size.width(), img->size.height()), img->pix->image());
            }
        }
    }
 
    // The font caches have now been initialized on the render thread, so they have to be
    // invalidated before we can use them from the main thread again.
    invalidateFontCaches();
 
    return node;
}
 
void QQuickText::updatePolish()
{
    Q_D(QQuickText);
    const bool clipNodeChanged =
            d->componentComplete && d->clipNode() && d->clipNode()->rect() != clipRect();
    if (clipNodeChanged)
        d->dirty(QQuickItemPrivate::Clip);
 
    // If the fonts used for rendering are different from the ones used in the GUI thread,
    // it means we will get warnings and corrupted text. If this case is detected, we need
    // to update the text layout before creating the scenegraph nodes.
    if (!d->assignedFont.isEmpty() && QFontInfo(d->font).family() != d->assignedFont)
        d->polishSize = true;
 
    if (d->polishSize) {
        d->updateSize();
        d->polishSize = false;
    }
    invalidateFontCaches();
}
 
qreal QQuickText::contentWidth() const
{
    Q_D(const QQuickText);
    return d->layedOutTextRect.width();
}
 
qreal QQuickText::contentHeight() const
{
    Q_D(const QQuickText);
    return d->layedOutTextRect.height() + qMax(d->lineHeightOffset(), 0);
}
 
qreal QQuickText::lineHeight() const
{
    Q_D(const QQuickText);
    return d->lineHeight();
}
 
void QQuickText::setLineHeight(qreal lineHeight)
{
    Q_D(QQuickText);
 
    if ((d->lineHeight() == lineHeight) || (lineHeight < 0.0))
        return;
 
    d->extra.value().lineHeightValid = true;
    d->extra.value().lineHeight = lineHeight;
    d->implicitHeightValid = false;
    d->updateLayout();
    emit lineHeightChanged(lineHeight);
}
 
QQuickText::LineHeightMode QQuickText::lineHeightMode() const
{
    Q_D(const QQuickText);
    return d->lineHeightMode();
}
 
void QQuickText::setLineHeightMode(LineHeightMode mode)
{
    Q_D(QQuickText);
    if (mode == d->lineHeightMode())
        return;
 
    d->implicitHeightValid = false;
    d->extra.value().lineHeightValid = true;
    d->extra.value().lineHeightMode = mode;
    d->updateLayout();
 
    emit lineHeightModeChanged(mode);
}
 
QQuickText::FontSizeMode QQuickText::fontSizeMode() const
{
    Q_D(const QQuickText);
    return d->fontSizeMode();
}
 
void QQuickText::setFontSizeMode(FontSizeMode mode)
{
    Q_D(QQuickText);
    if (d->fontSizeMode() == mode)
        return;
 
    d->polishSize = true;
    polish();
 
    d->extra.value().fontSizeMode = mode;
    emit fontSizeModeChanged();
}
 
int QQuickText::minimumPixelSize() const
{
    Q_D(const QQuickText);
    return d->minimumPixelSize();
}
 
void QQuickText::setMinimumPixelSize(int size)
{
    Q_D(QQuickText);
    if (d->minimumPixelSize() == size)
        return;
 
    if (d->fontSizeMode() != FixedSize && (widthValid() || heightValid())) {
        d->polishSize = true;
        polish();
    }
    d->extra.value().minimumPixelSize = size;
    emit minimumPixelSizeChanged();
}
 
int QQuickText::minimumPointSize() const
{
    Q_D(const QQuickText);
    return d->minimumPointSize();
}
 
void QQuickText::setMinimumPointSize(int size)
{
    Q_D(QQuickText);
    if (d->minimumPointSize() == size)
        return;
 
    if (d->fontSizeMode() != FixedSize && (widthValid() || heightValid())) {
        d->polishSize = true;
        polish();
    }
    d->extra.value().minimumPointSize = size;
    emit minimumPointSizeChanged();
}
 
int QQuickText::resourcesLoading() const
{
    Q_D(const QQuickText);
    if (d->richText && d->extra.isAllocated())
        return d->extra->pixmapsInProgress.size();
    return 0;
}
 
void QQuickText::componentComplete()
{
    Q_D(QQuickText);
    if (d->updateOnComponentComplete) {
        if (d->richText) {
            d->updateDocumentText();
        } else {
            d->rightToLeftText = d->text.isRightToLeft();
        }
        d->determineHorizontalAlignment();
    }
    QQuickItem::componentComplete();
    if (d->updateOnComponentComplete)
        d->updateLayout();
}
 
QString QQuickTextPrivate::anchorAt(const QTextLayout *layout, const QPointF &mousePos)
{
    for (int i = 0; i < layout->lineCount(); ++i) {
        QTextLine line = layout->lineAt(i);
        if (line.naturalTextRect().contains(mousePos)) {
            int charPos = line.xToCursor(mousePos.x(), QTextLine::CursorOnCharacter);
            const auto formats = layout->formats();
            for (const QTextLayout::FormatRange &formatRange : formats) {
                if (formatRange.format.isAnchor()
                        && charPos >= formatRange.start
                        && charPos < formatRange.start + formatRange.length) {
                    return formatRange.format.anchorHref();
                }
            }
            break;
        }
    }
    return QString();
}
 
QString QQuickTextPrivate::anchorAt(const QPointF &mousePos) const
{
    Q_Q(const QQuickText);
    QPointF translatedMousePos = mousePos;
    translatedMousePos.rx() -= q->leftPadding();
    translatedMousePos.ry() -= q->topPadding() + QQuickTextUtil::alignedY(layedOutTextRect.height() + lineHeightOffset(), availableHeight(), vAlign);
    if (styledText) {
        QString link = anchorAt(&layout, translatedMousePos);
        if (link.isEmpty() && elideLayout)
            link = anchorAt(elideLayout.get(), translatedMousePos);
        return link;
    } else if (richText && extra.isAllocated() && extra->doc) {
        translatedMousePos.rx() -= QQuickTextUtil::alignedX(layedOutTextRect.width(), availableWidth(), q->effectiveHAlign());
        return extra->doc->documentLayout()->anchorAt(translatedMousePos);
    }
    return QString();
}
 
bool QQuickTextPrivate::isLinkActivatedConnected()
{
    Q_Q(QQuickText);
    IS_SIGNAL_CONNECTED(q, QQuickText, linkActivated, (const QString &));
}
 
void QQuickText::mousePressEvent(QMouseEvent *event)
{
    Q_D(QQuickText);
 
    QString link;
    if (d->isLinkActivatedConnected())
        link = d->anchorAt(event->position());
 
    if (link.isEmpty()) {
        event->setAccepted(false);
    } else {
        d->extra.value().activeLink = link;
    }
 
    // ### may malfunction if two of the same links are clicked & dragged onto each other)
 
    if (!event->isAccepted())
        QQuickItem::mousePressEvent(event);
}
 
 
void QQuickText::mouseReleaseEvent(QMouseEvent *event)
{
    Q_D(QQuickText);
 
    // ### confirm the link, and send a signal out
 
    QString link;
    if (d->isLinkActivatedConnected())
        link = d->anchorAt(event->position());
 
    if (!link.isEmpty() && d->extra.isAllocated() && d->extra->activeLink == link)
        emit linkActivated(d->extra->activeLink);
    else
        event->setAccepted(false);
 
    if (!event->isAccepted())
        QQuickItem::mouseReleaseEvent(event);
}
 
bool QQuickTextPrivate::isLinkHoveredConnected()
{
    Q_Q(QQuickText);
    IS_SIGNAL_CONNECTED(q, QQuickText, linkHovered, (const QString &));
}
 
static void getLinks_helper(const QTextLayout *layout, QVector<QQuickTextPrivate::LinkDesc> *links)
{
    for (const QTextLayout::FormatRange &formatRange : layout->formats()) {
        if (formatRange.format.isAnchor()) {
            const int start = formatRange.start;
            const int len = formatRange.length;
            QTextLine line = layout->lineForTextPosition(start);
            QRectF r;
            r.setTop(line.y());
            r.setLeft(line.cursorToX(start, QTextLine::Leading));
            r.setHeight(line.height());
            r.setRight(line.cursorToX(start + len, QTextLine::Trailing));
            // ### anchorNames() is empty?! Not sure why this doesn't work
            // QString anchorName = formatRange.format.anchorNames().value(0); //### pick the first?
            // Therefore, we resort to QString::mid()
            QString anchorName = layout->text().mid(start, len);
            const QString anchorHref = formatRange.format.anchorHref();
            if (anchorName.isEmpty())
                anchorName = anchorHref;
            links->append( { anchorName, anchorHref, start, start + len, r.toRect()} );
        }
    }
}
 
QVector<QQuickTextPrivate::LinkDesc> QQuickTextPrivate::getLinks() const
{
    QVector<QQuickTextPrivate::LinkDesc> links;
    getLinks_helper(&layout, &links);
    return links;
}
 
 
QString QQuickText::hoveredLink() const
{
    Q_D(const QQuickText);
    if (const_cast<QQuickTextPrivate *>(d)->isLinkHoveredConnected()) {
        if (d->extra.isAllocated())
            return d->extra->hoveredLink;
    } else {
#if QT_CONFIG(cursor)
        if (QQuickWindow *wnd = window()) {
            QPointF pos = QCursor::pos(wnd->screen()) - wnd->position() - mapToScene(QPointF(0, 0));
            return d->anchorAt(pos);
        }
#endif // cursor
    }
    return QString();
}
 
void QQuickTextPrivate::processHoverEvent(QHoverEvent *event)
{
    Q_Q(QQuickText);
    qCDebug(lcHoverTrace) << q;
    QString link;
    if (isLinkHoveredConnected()) {
        if (event->type() != QEvent::HoverLeave)
            link = anchorAt(event->position());
 
        if ((!extra.isAllocated() && !link.isEmpty()) || (extra.isAllocated() && extra->hoveredLink != link)) {
            extra.value().hoveredLink = link;
            emit q->linkHovered(extra->hoveredLink);
        }
    }
    event->ignore();
}
 
void QQuickText::hoverEnterEvent(QHoverEvent *event)
{
    Q_D(QQuickText);
    d->processHoverEvent(event);
}
 
void QQuickText::hoverMoveEvent(QHoverEvent *event)
{
    Q_D(QQuickText);
    d->processHoverEvent(event);
}
 
void QQuickText::hoverLeaveEvent(QHoverEvent *event)
{
    Q_D(QQuickText);
    d->processHoverEvent(event);
}
 
void QQuickText::invalidate()
{
    Q_D(QQuickText);
    d->textHasChanged = true;
    QMetaObject::invokeMethod(this,[&]{q_updateLayout();});
}
 
bool QQuickTextPrivate::transformChanged(QQuickItem *transformedItem)
{
    // If there's a lot of text, we may need QQuickText::updatePaintNode() to call
    // QSGInternalTextNode::addTextLayout() again to populate a different range of lines
    if (flags & QQuickItem::ItemObservesViewport) {
        updateType = UpdatePaintNode;
        dirty(QQuickItemPrivate::Content);
    }
    return QQuickImplicitSizeItemPrivate::transformChanged(transformedItem);
}
 
int QQuickText::renderTypeQuality() const
{
    Q_D(const QQuickText);
    return d->renderTypeQuality();
}
 
void QQuickText::setRenderTypeQuality(int renderTypeQuality)
{
    Q_D(QQuickText);
    if (renderTypeQuality == d->renderTypeQuality())
        return;
    d->extra.value().renderTypeQuality = renderTypeQuality;
 
    if (isComponentComplete()) {
        d->updateType = QQuickTextPrivate::UpdatePaintNode;
        update();
    }
 
    emit renderTypeQualityChanged();
}
 
QQuickText::RenderType QQuickText::renderType() const
{
    Q_D(const QQuickText);
    return d->renderType;
}
 
void QQuickText::setRenderType(QQuickText::RenderType renderType)
{
    Q_D(QQuickText);
    if (d->renderType == renderType)
        return;
 
    d->renderType = renderType;
    emit renderTypeChanged();
 
    if (isComponentComplete())
        d->updateLayout();
}
 
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
#if QT_DEPRECATED_SINCE(5, 15)
void QQuickText::doLayout()
{
    forceLayout();
}
 
#endif
#endif
void QQuickText::forceLayout()
{
    Q_D(QQuickText);
    d->updateSize();
}
 
QString QQuickText::linkAt(qreal x, qreal y) const
{
    Q_D(const QQuickText);
    return d->anchorAt(QPointF(x, y));
}
 
void QQuickText::invalidateFontCaches()
{
    Q_D(QQuickText);
 
    if (d->richText && d->extra.isAllocated() && d->extra->doc != nullptr) {
        QTextBlock block;
        for (block = d->extra->doc->firstBlock(); block.isValid(); block = block.next()) {
            if (block.layout() != nullptr && block.layout()->engine() != nullptr)
                block.layout()->engine()->resetFontEngineCache();
        }
    } else {
        if (d->layout.engine() != nullptr)
            d->layout.engine()->resetFontEngineCache();
    }
}
 
qreal QQuickText::padding() const
{
    Q_D(const QQuickText);
    return d->padding();
}
 
void QQuickText::setPadding(qreal padding)
{
    Q_D(QQuickText);
    if (qFuzzyCompare(d->padding(), padding))
        return;
 
    d->extra.value().padding = padding;
    d->updateSize();
    emit paddingChanged();
    if (!d->extra.isAllocated() || !d->extra->explicitTopPadding)
        emit topPaddingChanged();
    if (!d->extra.isAllocated() || !d->extra->explicitLeftPadding)
        emit leftPaddingChanged();
    if (!d->extra.isAllocated() || !d->extra->explicitRightPadding)
        emit rightPaddingChanged();
    if (!d->extra.isAllocated() || !d->extra->explicitBottomPadding)
        emit bottomPaddingChanged();
}
 
void QQuickText::resetPadding()
{
    setPadding(0);
}
 
qreal QQuickText::topPadding() const
{
    Q_D(const QQuickText);
    if (d->extra.isAllocated() && d->extra->explicitTopPadding)
        return d->extra->topPadding;
    return d->padding();
}
 
void QQuickText::setTopPadding(qreal padding)
{
    Q_D(QQuickText);
    d->setTopPadding(padding);
}
 
void QQuickText::resetTopPadding()
{
    Q_D(QQuickText);
    d->setTopPadding(0, true);
}
 
qreal QQuickText::leftPadding() const
{
    Q_D(const QQuickText);
    if (d->extra.isAllocated() && d->extra->explicitLeftPadding)
        return d->extra->leftPadding;
    return d->padding();
}
 
void QQuickText::setLeftPadding(qreal padding)
{
    Q_D(QQuickText);
    d->setLeftPadding(padding);
}
 
void QQuickText::resetLeftPadding()
{
    Q_D(QQuickText);
    d->setLeftPadding(0, true);
}
 
qreal QQuickText::rightPadding() const
{
    Q_D(const QQuickText);
    if (d->extra.isAllocated() && d->extra->explicitRightPadding)
        return d->extra->rightPadding;
    return d->padding();
}
 
void QQuickText::setRightPadding(qreal padding)
{
    Q_D(QQuickText);
    d->setRightPadding(padding);
}
 
void QQuickText::resetRightPadding()
{
    Q_D(QQuickText);
    d->setRightPadding(0, true);
}
 
qreal QQuickText::bottomPadding() const
{
    Q_D(const QQuickText);
    if (d->extra.isAllocated() && d->extra->explicitBottomPadding)
        return d->extra->bottomPadding;
    return d->padding();
}
 
void QQuickText::setBottomPadding(qreal padding)
{
    Q_D(QQuickText);
    d->setBottomPadding(padding);
}
 
void QQuickText::resetBottomPadding()
{
    Q_D(QQuickText);
    d->setBottomPadding(0, true);
}
 
QJSValue QQuickText::fontInfo() const
{
    Q_D(const QQuickText);
 
    QJSEngine *engine = qjsEngine(this);
    if (!engine) {
        qmlWarning(this) << "fontInfo: item has no JS engine";
        return QJSValue();
    }
 
    QJSValue value = engine->newObject();
    value.setProperty(QStringLiteral("family"), d->fontInfo.family());
    value.setProperty(QStringLiteral("styleName"), d->fontInfo.styleName());
    value.setProperty(QStringLiteral("bold"), d->fontInfo.bold());
    value.setProperty(QStringLiteral("weight"), d->fontInfo.weight());
    value.setProperty(QStringLiteral("italic"), d->fontInfo.italic());
    value.setProperty(QStringLiteral("pointSize"), d->fontInfo.pointSizeF());
    value.setProperty(QStringLiteral("pixelSize"), d->fontInfo.pixelSize());
    return value;
}
 
QSizeF QQuickText::advance() const
{
    Q_D(const QQuickText);
    return d->advance;
}
 
QT_END_NAMESPACE
 
#include "moc_qquicktext_p.cpp"