C++ QTextLine::cursorToX方法代码示例

void GroupedLineEdit::paintEvent(QPaintEvent *e)
{
	QTextLine line = document()->findBlock(0).layout()->lineAt(0);
	QPainter painter(viewport());

	painter.setRenderHint(QPainter::Antialiasing, true);
	painter.fillRect(0, 0, viewport()->width(), viewport()->height(), palette().base());

	QVectorIterator<QColor> i(d->colors);
	i.toFront();
	foreach (const Private::Block &block, d->blocks) {
		qreal start_x = line.cursorToX(block.start, QTextLine::Leading);
		qreal end_x = line.cursorToX(block.end-1, QTextLine::Trailing);

		QPainterPath path;
		QRectF rectangle(
			start_x - 1.0 - double(horizontalScrollBar()->value()),
			1.0,
			end_x - start_x + 2.0,
			double(viewport()->height() - 2));
		if (!i.hasNext())
			i.toFront();
		path.addRoundedRect(rectangle, 5.0, 5.0);
		painter.setPen(i.peekNext());
		if (palette().color(QPalette::Text).lightnessF() <= 0.3)
			painter.setBrush(i.next().lighter());
		else if (palette().color(QPalette::Text).lightnessF() <= 0.6)
			painter.setBrush(i.next());
		else
			painter.setBrush(i.next().darker());
		painter.drawPath(path);
	}
	QPlainTextEdit::paintEvent(e);
}

static void calculateBoundingRect( QTextDocument *document, int startPosition, int endPosition,
                                   QRectF &rect )
{
    const QTextBlock startBlock = document->findBlock( startPosition );
    const QRectF startBoundingRect = document->documentLayout()->blockBoundingRect( startBlock );

    const QTextBlock endBlock = document->findBlock( endPosition );
    const QRectF endBoundingRect = document->documentLayout()->blockBoundingRect( endBlock );

    QTextLayout *startLayout = startBlock.layout();
    QTextLayout *endLayout = endBlock.layout();

    int startPos = startPosition - startBlock.position();
    int endPos = endPosition - endBlock.position();
    const QTextLine startLine = startLayout->lineForTextPosition( startPos );
    const QTextLine endLine = endLayout->lineForTextPosition( endPos );

    double x = startBoundingRect.x() + startLine.cursorToX( startPos );
    double y = startBoundingRect.y() + startLine.y();
    double r = endBoundingRect.x() + endLine.cursorToX( endPos );
    double b = endBoundingRect.y() + endLine.y() + endLine.height();

    const QSizeF size = document->size();
    rect = QRectF( x / size.width(), y / size.height(),
                   (r - x) / size.width(), (b - y) / size.height() );
}

FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& pt, int h, int from, int to) const
{
    const QString string = fixSpacing(qstring(run));
    QTextLayout layout(string, font());
    QTextLine line = setupLayout(&layout, run);

    float x1 = line.cursorToX(from);
    float x2 = line.cursorToX(to);
    if (x2 < x1)
        qSwap(x1, x2);

    return FloatRect(pt.x() + x1, pt.y(), x2 - x1, h);
}

void tst_QComplexText::bidiCursor_PDF()
{
    QString str = QString::fromUtf8("\342\200\252hello\342\200\254");
    QTextLayout layout(str);

    layout.beginLayout();
    QTextLine line = layout.createLine();
    layout.endLayout();

    int size = str.size();

    QVERIFY(line.cursorToX(size) == line.cursorToX(size - 1));
}

void SurfaceImpl::MeasureWidths(Font &font,
                                const char *s,
                                int len,
                                XYPOSITION *positions)
{
	if (!font.GetID())
		return;
	SetCodec(font);
	QString su = codec->toUnicode(s, len);
	QTextLayout tlay(su, *FontPointer(font));
	tlay.beginLayout();
	QTextLine tl = tlay.createLine();
	tlay.endLayout();
	if (unicodeMode) {
		int fit = su.size();
		int ui=0;
		const unsigned char *us = reinterpret_cast<const unsigned char *>(s);
		int i=0;
		while (ui<fit) {
			size_t lenChar = utf8LengthFromLead(us[i]);
			size_t codeUnits = (lenChar < 4) ? 1 : 2;
			qreal xPosition = tl.cursorToX(ui+codeUnits);
			for (unsigned int bytePos=0; (bytePos<lenChar) && (i<len); bytePos++) {
				positions[i++] = qRound(xPosition);
			}
			ui += codeUnits;
		}
		int lastPos = 0;
		if (i > 0)
			lastPos = positions[i-1];
		while (i<len) {
			positions[i++] = lastPos;
		}
	} else if (codePage) {
		// DBCS
		int ui = 0;
		for (int i=0; i<len;) {
			size_t lenChar = Platform::IsDBCSLeadByte(codePage, s[i]) ? 2 : 1;
			qreal xPosition = tl.cursorToX(ui+1);
			for (unsigned int bytePos=0; (bytePos<lenChar) && (i<len); bytePos++) {
				positions[i++] = qRound(xPosition);
			}
			ui++;
		}
	} else {
		// Single byte encoding
		for (int i=0; i<len; i++) {
			positions[i] = qRound(tl.cursorToX(i+1));
		}
	}
}

FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& pt, int h, int from, int to) const
{
    String sanitized = Font::normalizeSpaces(run.characters(), run.length());
    QString string = fromRawDataWithoutRef(sanitized);

    QTextLayout layout(string, font());
    QTextLine line = setupLayout(&layout, run);

    float x1 = line.cursorToX(from);
    float x2 = line.cursorToX(to);
    if (x2 < x1)
        qSwap(x1, x2);

    return FloatRect(pt.x() + x1, pt.y(), x2 - x1, h);
}

void tst_QTextFormat::testTabsUsed()
{
    QTextDocument doc;
    QTextCursor cursor(&doc);

    QList<QTextOption::Tab> tabs;
    QTextBlockFormat format;
    QTextOption::Tab tab;
    tab.position = 100;
    tabs.append(tab);
    format.setTabPositions(tabs);
    cursor.mergeBlockFormat(format);
    cursor.insertText("foo\tbar");
    //doc.setPageSize(QSizeF(200, 200));
    doc.documentLayout()->pageCount(); // force layout;

    QTextBlock block = doc.begin();
    QTextLayout *layout = block.layout();
    QVERIFY(layout);
    QCOMPARE(layout->lineCount(), 1);
    QTextLine line = layout->lineAt(0);
    QCOMPARE(line.cursorToX(4), 100.);

    QTextOption option = layout->textOption();
    QCOMPARE(option.tabs().count(), tabs.count());

}

void GroupedLineEdit::paintEvent(QPaintEvent *e)
{
#if !defined __APPLE__
	// for reasons we don't understand, yet, touching the painter
	// here (even drawing the fill rect) causes the QPlainTextEdit
	// paintEvent to not draw the text on MacOS.
	// So as a workaround until this is better understood we need
	// to disable the eye candy
	QTextLine line = document()->findBlock(0).layout()->lineAt(0);
	QPainter painter(viewport());

	painter.setRenderHint(QPainter::Antialiasing, true);
	painter.fillRect(0, 0, viewport()->width(), viewport()->height(), palette().base());

	QVectorIterator<QColor> i(d->colors);
	i.toFront();
	foreach (const Private::Block &block, d->blocks) {
		qreal start_x = line.cursorToX(block.start, QTextLine::Leading);
#if QT_VERSION >= 0x050000
		qreal end_x = line.cursorToX(block.end-1, QTextLine::Trailing);
#else
		qreal end_x = line.cursorToX(block.end, QTextLine::Trailing);
#endif
		QPainterPath path;
		QRectF rectangle(
			start_x - 1.0 - double(horizontalScrollBar()->value()),
			1.0,
			end_x - start_x + 2.0,
			double(viewport()->height() - 2));
		if (!i.hasNext())
			i.toFront();
		path.addRoundedRect(rectangle, 5.0, 5.0);
		painter.setPen(i.peekNext());
		if (palette().color(QPalette::Text).lightnessF() <= 0.3)
			painter.setBrush(i.next().lighter());
		else if (palette().color(QPalette::Text).lightnessF() <= 0.6)
			painter.setBrush(i.next());
		else
			painter.setBrush(i.next().darker());
		painter.drawPath(path);
	}
#endif
	QPlainTextEdit::paintEvent(e);
}

void tst_QComplexText::bidiCursorMovement()
{
    QFETCH(QString, logical);
    QFETCH(int,  basicDir);

    QTextLayout layout(logical);
    layout.setCacheEnabled(true);

    QTextOption option = layout.textOption();
    option.setTextDirection(basicDir == QChar::DirL ? Qt::LeftToRight : Qt::RightToLeft);
    layout.setTextOption(option);
    layout.setCursorMoveStyle(Qt::VisualMoveStyle);
    bool moved;
    int oldPos, newPos = 0;
    qreal x, newX;

    layout.beginLayout();
    QTextLine line = layout.createLine();
    layout.endLayout();

    newX = line.cursorToX(0);
    do {
        oldPos = newPos;
        x = newX;
        newX = line.cursorToX(oldPos);
        if (basicDir == QChar::DirL) {
            QVERIFY(newX >= x);
            newPos = layout.rightCursorPosition(oldPos);
        } else
        {
            QVERIFY(newX <= x);
            newPos = layout.leftCursorPosition(oldPos);
        }
        moved = (oldPos != newPos);
    } while (moved);
}

void CodeEditor::paintEvent(QPaintEvent* event)
{
    QPlainTextEdit::paintEvent(event);

    QPainter painter(viewport());
    painter.setPen(Qt::darkGray);

    QTextBlock block = firstVisibleBlock();

    QRectF rect;

    do {

        if (!block.isVisible())
            continue;

        rect = blockBoundingGeometry(block).translated(contentOffset());

        QTextLine line = block.layout()->lineAt(0);

        if (config->whitespaces) {
            QString txt = block.text();

            for (int i = 0; i < txt.length(); i++) {
                // rect.x() <- учитывая горизонтальный скролинг
                QPoint point(rect.x() + line.cursorToX(i), rect.y() + line.ascent());

                if (txt[i] == ' ')
                    painter.drawText(point, QChar(0x00b7));
                else if (txt[i] == '\t')
                    painter.drawText(point, QChar(0x21b9));
            }
        }

        int state = block.userState();

        if (!(state & Error) && state & Folded) {
            QRect collapseRect(rect.x() + line.rect().x() + line.naturalTextWidth() + FONTWIDTH * 2,
                               rect.y() + 2, FONTWIDTH * 6, line.height() - 4);

            painter.drawText(collapseRect, Qt::AlignCenter, state & Comment ? "...;" : "...)");
            painter.drawRoundedRect(collapseRect, 4, 6);
        }

    } while ((block = block.next()).isValid() && rect.y() < viewport()->height());
}

QPainterPath TextEditorOverlay::createSelectionPath(const QTextCursor &begin, const QTextCursor &end,
                                                    const QRect &clip)
{
    if (begin.isNull() || end.isNull() || begin.position() > end.position())
        return QPainterPath();

    QPointF offset = m_editor->contentOffset();
    QRect viewportRect = rect();
    QTextDocument *document = m_editor->document();

    if (m_editor->blockBoundingGeometry(begin.block()).translated(offset).top() > clip.bottom() + 10
        || m_editor->blockBoundingGeometry(end.block()).translated(offset).bottom() < clip.top() - 10
        )
        return QPainterPath(); // nothing of the selection is visible


    QTextBlock block = begin.block();

    if (block.blockNumber() < m_editor->firstVisibleBlock().blockNumber() - 4)
        block = m_editor->document()->findBlockByNumber(m_editor->firstVisibleBlock().blockNumber() - 4);

    bool inSelection = false;

    QVector<QRectF> selection;

    if (begin.position() == end.position()) {
        // special case empty selections
        const QRectF blockGeometry = m_editor->blockBoundingGeometry(block);
        QTextLayout *blockLayout = block.layout();
        int pos = begin.position() - begin.block().position();
        QTextLine line = blockLayout->lineForTextPosition(pos);
        QRectF lineRect = line.naturalTextRect();
        int x = line.cursorToX(pos);
        lineRect.setLeft(x - m_borderWidth);
        lineRect.setRight(x + m_borderWidth);
        selection += lineRect.translated(blockGeometry.topLeft());
    } else {
        for (; block.isValid() && block.blockNumber() <= end.blockNumber(); block = block.next()) {
            if (! block.isVisible())
                continue;

            const QRectF blockGeometry = m_editor->blockBoundingGeometry(block);
            QTextLayout *blockLayout = block.layout();

            QTextLine line = blockLayout->lineAt(0);
            bool firstOrLastBlock = false;

            int beginChar = 0;
            if (!inSelection) {
                if (block == begin.block()) {
                    beginChar = begin.positionInBlock();
                    line = blockLayout->lineForTextPosition(beginChar);
                    firstOrLastBlock = true;
                }
                inSelection = true;
            } else {
//                while (beginChar < block.length() && document->characterAt(block.position() + beginChar).isSpace())
//                    ++beginChar;
//                if (beginChar == block.length())
//                    beginChar = 0;
            }

            int lastLine = blockLayout->lineCount()-1;
            int endChar = -1;
            if (block == end.block()) {
                endChar = end.positionInBlock();
                lastLine = blockLayout->lineForTextPosition(endChar).lineNumber();
                inSelection = false;
                firstOrLastBlock = true;
            } else {
                endChar = block.length();
                while (endChar > beginChar && document->characterAt(block.position() + endChar - 1).isSpace())
                    --endChar;
            }

            QRectF lineRect = line.naturalTextRect();
            if (beginChar < endChar) {
                lineRect.setLeft(line.cursorToX(beginChar));
                if (line.lineNumber() == lastLine)
                    lineRect.setRight(line.cursorToX(endChar));
                selection += lineRect.translated(blockGeometry.topLeft());

                for (int lineIndex = line.lineNumber()+1; lineIndex <= lastLine; ++lineIndex) {
                    line = blockLayout->lineAt(lineIndex);
                    lineRect = line.naturalTextRect();
                    if (lineIndex == lastLine)
                        lineRect.setRight(line.cursorToX(endChar));
                    selection += lineRect.translated(blockGeometry.topLeft());
                }
            } else { // empty lines
                const int emptyLineSelectionSize = 16;
                if (!firstOrLastBlock && !selection.isEmpty()) { // middle
                    lineRect.setLeft(selection.last().left());
                } else if (inSelection) { // first line
                    lineRect.setLeft(line.cursorToX(beginChar));
                } else { // last line
                    if (endChar == 0)
                        break;
                    lineRect.setLeft(line.cursorToX(endChar) - emptyLineSelectionSize);
                }
//.........这里部分代码省略.........

void ChatLineModelItem::computeWrapList() const
{
    QString text = _styledMsg.plainContents();
    int length = text.length();
    if (!length)
        return;

    QList<ChatLineModel::Word> wplist; // use a temp list which we'll later copy into a QVector for efficiency
    QTextBoundaryFinder finder(QTextBoundaryFinder::Line, _styledMsg.plainContents().unicode(), length,
                               TextBoundaryFinderBuffer, TextBoundaryFinderBufferSize);

    int idx;
    int oldidx = 0;
    ChatLineModel::Word word;
    word.start = 0;
    qreal wordstartx = 0;

    QTextLayout layout(_styledMsg.plainContents());
    QTextOption option;
    option.setWrapMode(QTextOption::NoWrap);
    layout.setTextOption(option);

    layout.setAdditionalFormats(QtUi::style()->toTextLayoutList(_styledMsg.contentsFormatList(), length, messageLabel()));
    layout.beginLayout();
    QTextLine line = layout.createLine();
    line.setNumColumns(length);
    layout.endLayout();

    while ((idx = finder.toNextBoundary()) >= 0 && idx <= length) {
        // QTextBoundaryFinder has inconsistent behavior in Qt version up to and including 4.6.3 (at least).
        // It doesn't point to the position we should break, but to the character before that.
        // Unfortunately Qt decided to fix this by changing the behavior of QTBF, so now we have to add a version
        // check. At the time of this writing, I'm still trying to get this reverted upstream...
        //
        // cf. https://bugs.webkit.org/show_bug.cgi?id=31076 and Qt commit e6ac173
        static int needWorkaround = -1;
        if (needWorkaround < 0) {
            needWorkaround = 0;
            QStringList versions = QString(qVersion()).split('.');
            if (versions.count() == 3 && versions.at(0).toInt() == 4) {
                if (versions.at(1).toInt() <= 6 && versions.at(2).toInt() <= 3)
                    needWorkaround = 1;
            }
        }
        if (needWorkaround == 1) {
            if (idx < length)
                idx++;
        }

        if (idx == oldidx)
            continue;

        word.start = oldidx;
        int wordend = idx;
        for (; wordend > word.start; wordend--) {
            if (!text.at(wordend-1).isSpace())
                break;
        }

        qreal wordendx = line.cursorToX(wordend);
        qreal trailingendx = line.cursorToX(idx);
        word.endX = wordendx;
        word.width = wordendx - wordstartx;
        word.trailing = trailingendx - wordendx;
        wordstartx = trailingendx;
        wplist.append(word);

        oldidx = idx;
    }

    // A QVector needs less space than a QList
    _wrapList.resize(wplist.count());
    for (int i = 0; i < wplist.count(); i++) {
        _wrapList[i] = wplist.at(i);
    }
}

void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to) const
{
    if (to < 0)
        to = run.length();

    QPainter *p = ctx->platformContext();

    if (ctx->textDrawingMode() & cTextFill) {
        if (ctx->fillGradient()) {
            QBrush brush(*ctx->fillGradient()->platformGradient());
            brush.setTransform(ctx->fillGradient()->gradientSpaceTransform());
            p->setPen(QPen(brush, 0));
        } else if (ctx->fillPattern()) {
            TransformationMatrix affine;
            p->setPen(QPen(QBrush(ctx->fillPattern()->createPlatformPattern(affine)), 0));
        } else
            p->setPen(QColor(ctx->fillColor()));
    }

    if (ctx->textDrawingMode() & cTextStroke) {
        if (ctx->strokeGradient()) {
            QBrush brush(*ctx->strokeGradient()->platformGradient());
            brush.setTransform(ctx->strokeGradient()->gradientSpaceTransform());
            p->setPen(QPen(brush, ctx->strokeThickness()));
        } else if (ctx->strokePattern()) {
            TransformationMatrix affine;
            p->setPen(QPen(QBrush(ctx->strokePattern()->createPlatformPattern(affine)), ctx->strokeThickness()));
        } else
            p->setPen(QPen(QColor(ctx->strokeColor()), ctx->strokeThickness()));
    }

    const QString string = fixSpacing(qstring(run));

    // text shadow
    IntSize shadowSize;
    int shadowBlur;
    Color shadowColor;
    bool hasShadow = ctx->textDrawingMode() == cTextFill && ctx->getShadow(shadowSize, shadowBlur, shadowColor);

    if (from > 0 || to < run.length()) {
        QTextLayout layout(string, font());
        QTextLine line = setupLayout(&layout, run);
        float x1 = line.cursorToX(from);
        float x2 = line.cursorToX(to);
        if (x2 < x1)
            qSwap(x1, x2);

        QFontMetrics fm(font());
        int ascent = fm.ascent();
        QRectF clip(point.x() + x1, point.y() - ascent, x2 - x1, fm.height());

        if (hasShadow) {
            // TODO: when blur support is added, the clip will need to account
            // for the blur radius
            qreal dx1 = 0, dx2 = 0, dy1 = 0, dy2 = 0;
            if (shadowSize.width() > 0)
                dx2 = shadowSize.width();
            else
                dx1 = -shadowSize.width();
            if (shadowSize.height() > 0)
                dy2 = shadowSize.height();
            else
                dy1 = -shadowSize.height();
            // expand the clip rect to include the text shadow as well
            clip.adjust(dx1, dx2, dy1, dy2);
        }
        p->save();
        p->setClipRect(clip.toRect());
        QPointF pt(point.x(), point.y() - ascent);
        if (hasShadow) {
            p->save();
            p->setPen(QColor(shadowColor));
            p->translate(shadowSize.width(), shadowSize.height());
            line.draw(p, pt);
            p->restore();
        }
        line.draw(p, pt);
        p->restore();
        return;
    }

    p->setFont(font());

    QPointF pt(point.x(), point.y());
    int flags = run.rtl() ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight;
    if (hasShadow) {
        // TODO: text shadow blur support
        p->save();
        p->setPen(QColor(shadowColor));
        p->translate(shadowSize.width(), shadowSize.height());
        p->drawText(pt, string, flags, run.padding());
        p->restore();
    }
    if (ctx->textDrawingMode() & cTextStroke) {
        QPainterPath path;
        path.addText(pt, font(), string);
        p->strokePath(path, p->pen());
    }
    if (ctx->textDrawingMode() & cTextFill)
        p->drawText(pt, string, flags, run.padding());
//.........这里部分代码省略.........

static void drawTextCommon(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to, const QFont& font, bool isComplexText)
{
    if (to < 0)
        to = run.length();

    QPainter *p = ctx->platformContext();

    QPen textFillPen;
    if (ctx->textDrawingMode() & cTextFill) {
        if (ctx->fillGradient()) {
            QBrush brush(*ctx->fillGradient()->platformGradient());
            brush.setTransform(ctx->fillGradient()->gradientSpaceTransform());
            textFillPen = QPen(brush, 0);
        } else if (ctx->fillPattern()) {
            AffineTransform affine;
            textFillPen = QPen(QBrush(ctx->fillPattern()->createPlatformPattern(affine)), 0);
        } else
            textFillPen = QPen(QColor(ctx->fillColor()));
    }

    QPen textStrokePen;
    if (ctx->textDrawingMode() & cTextStroke) {
        if (ctx->strokeGradient()) {
            QBrush brush(*ctx->strokeGradient()->platformGradient());
            brush.setTransform(ctx->strokeGradient()->gradientSpaceTransform());
            textStrokePen = QPen(brush, ctx->strokeThickness());
        } else if (ctx->strokePattern()) {
            AffineTransform affine;
            QBrush brush(ctx->strokePattern()->createPlatformPattern(affine));
            textStrokePen = QPen(brush, ctx->strokeThickness());
        } else
            textStrokePen = QPen(QColor(ctx->strokeColor()), ctx->strokeThickness());
    }

    String sanitized = Font::normalizeSpaces(String(run.characters(), run.length()));
    QString string = fromRawDataWithoutRef(sanitized);
    QPointF pt(point.x(), point.y());

    // text shadow
    IntSize shadowSize;
    int shadowBlur;
    Color shadowColor;
    bool hasShadow = ctx->textDrawingMode() == cTextFill && ctx->getShadow(shadowSize, shadowBlur, shadowColor);

    if (from > 0 || to < run.length()) {
        if (isComplexText) {
            QTextLayout layout(string, font);
            QTextLine line = setupLayout(&layout, run);
            float x1 = line.cursorToX(from);
            float x2 = line.cursorToX(to);
            if (x2 < x1)
                qSwap(x1, x2);

            QFontMetrics fm(font);
            int ascent = fm.ascent();
            QRectF clip(fm.boundingRect(string));

            if (hasShadow) {
                // TODO: when blur support is added, the clip will need to account
                // for the blur radius
                qreal dx1 = 0, dx2 = 0, dy1 = 0, dy2 = 0;
                if (shadowSize.width() > 0)
                    dx2 = shadowSize.width();
                else
                    dx1 = -shadowSize.width();
                if (shadowSize.height() > 0)
                    dy2 = shadowSize.height();
                else
                    dy1 = -shadowSize.height();
                // expand the clip rect to include the text shadow as well
                clip.adjust(dx1, dx2, dy1, dy2);
            }
            p->save();
            //p->setClipRect(clip.toRect(), Qt::IntersectClip);
            pt.setY(pt.y() - ascent);
            if (hasShadow) {
                p->save();
                p->setPen(QColor(shadowColor));
                p->translate(shadowSize.width(), shadowSize.height());
                line.draw(p, pt);
                p->restore();
            }
            p->setPen(textFillPen);
            line.draw(p, pt);
            p->restore();
            return;
        }
#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
        int skipWidth = QFontMetrics(font).width(string, from, Qt::TextBypassShaping);
        pt.setX(pt.x() + skipWidth);
        string = fromRawDataWithoutRef(sanitized, from, to - from);
#endif
    }

    p->setFont(font);

    int flags = run.rtl() ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight;
#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
    // See QWebPagePrivate::QWebPagePrivate() where the default path is set to Complex for Qt 4.6 and earlier.
    if (!isComplexText)
//.........这里部分代码省略.........

/*
The ultimate line painting function.
Currently missing features:
- draw indent lines
*/
void KateRenderer::paintTextLine(QPainter& paint, KateLineLayoutPtr range, int xStart, int xEnd, const KTextEditor::Cursor* cursor)
{
  Q_ASSERT(range->isValid());

//   kDebug( 13033 )<<"KateRenderer::paintTextLine";

  // font data
  const QFontMetricsF &fm = config()->fontMetrics();

  int currentViewLine = -1;
  if (cursor && cursor->line() == range->line())
    currentViewLine = range->viewLineForColumn(cursor->column());

  paintTextLineBackground(paint, range, currentViewLine, xStart, xEnd);

  if (range->layout()) {
    bool drawSelection = m_view->selection() && showSelections() && m_view->selectionRange().overlapsLine(range->line());
    // Draw selection in block selecton mode. We need 2 kinds of selections that QTextLayout::draw can't render:
    //   - past-end-of-line selection and
    //   - 0-column-wide selection (used to indicate where text will be typed)
    if (drawSelection && m_view->blockSelection()) {
      int selectionStartColumn = m_doc->fromVirtualColumn(range->line(), m_doc->toVirtualColumn(m_view->selectionRange().start()));
      int selectionEndColumn   = m_doc->fromVirtualColumn(range->line(), m_doc->toVirtualColumn(m_view->selectionRange().end()));
      QBrush selectionBrush = config()->selectionColor();
      if (selectionStartColumn != selectionEndColumn) {
        KateTextLayout lastLine = range->viewLine(range->viewLineCount() - 1);
        if (selectionEndColumn > lastLine.startCol()) {
          int selectionStartX = (selectionStartColumn > lastLine.startCol()) ? cursorToX(lastLine, selectionStartColumn, true) : 0;
          int selectionEndX = cursorToX(lastLine, selectionEndColumn, true);
          paint.fillRect(QRect(selectionStartX - xStart, (int)lastLine.lineLayout().y(), selectionEndX - selectionStartX, lineHeight()), selectionBrush);
        }
      } else {
        const int selectStickWidth = 2;
        KateTextLayout selectionLine = range->viewLine(range->viewLineForColumn(selectionStartColumn));
        int selectionX = cursorToX(selectionLine, selectionStartColumn, true);
        paint.fillRect(QRect(selectionX - xStart, (int)selectionLine.lineLayout().y(), selectStickWidth, lineHeight()), selectionBrush);
      }
    }

    QVector<QTextLayout::FormatRange> additionalFormats;
    if (range->length() > 0) {
      // We may have changed the pen, be absolutely sure it gets set back to
      // normal foreground color before drawing text for text that does not
      // set the pen color
      paint.setPen(attribute(KTextEditor::HighlightInterface::dsNormal)->foreground().color());
      // Draw the text :)
      if (drawSelection) {
        // FIXME toVector() may be a performance issue
        additionalFormats = decorationsForLine(range->textLine(), range->line(), true).toVector();
        range->layout()->draw(&paint, QPoint(-xStart,0), additionalFormats);

      } else {
        range->layout()->draw(&paint, QPoint(-xStart,0));
      }
    }

    QBrush backgroundBrush;
    bool backgroundBrushSet = false;

    // Loop each individual line for additional text decoration etc.
    QListIterator<QTextLayout::FormatRange> it = range->layout()->additionalFormats();
    QVectorIterator<QTextLayout::FormatRange> it2 = additionalFormats;
    for (int i = 0; i < range->viewLineCount(); ++i) {
      KateTextLayout line = range->viewLine(i);

      // Determine the background to use, if any, for the end of this view line
      backgroundBrushSet = false;
      while (it2.hasNext()) {
        const QTextLayout::FormatRange& fr = it2.peekNext();
        if (fr.start > line.endCol())
          break;

        if (fr.start + fr.length > line.endCol()) {
          if (fr.format.hasProperty(QTextFormat::BackgroundBrush)) {
            backgroundBrushSet = true;
            backgroundBrush = fr.format.background();
          }

          goto backgroundDetermined;
        }

        it2.next();
      }

      while (it.hasNext()) {
        const QTextLayout::FormatRange& fr = it.peekNext();
        if (fr.start > line.endCol())
          break;

        if (fr.start + fr.length > line.endCol()) {
          if (fr.format.hasProperty(QTextFormat::BackgroundBrush)) {
            backgroundBrushSet = true;
            backgroundBrush = fr.format.background();
          }

//.........这里部分代码省略.........