C++ QTextLayout类代码示例

void QSyntaxHighlighterPrivate::applyFormatChanges()
{
    QTextLayout *layout = currentBlock.layout();

    QList<QTextLayout::FormatRange> ranges = layout->additionalFormats();

    const int preeditAreaStart = layout->preeditAreaPosition();
    const int preeditAreaLength = layout->preeditAreaText().length();

    QList<QTextLayout::FormatRange>::Iterator it = ranges.begin();
    while (it != ranges.end()) {
        if (it->start >= preeditAreaStart
            && it->start + it->length <= preeditAreaStart + preeditAreaLength)
            ++it;
        else
            it = ranges.erase(it);
    }

    QTextCharFormat emptyFormat;

    QTextLayout::FormatRange r;
    r.start = r.length = -1;

    int i = 0;
    while (i < formatChanges.count()) {

        while (i < formatChanges.count() && formatChanges.at(i) == emptyFormat)
            ++i;

        if (i >= formatChanges.count())
            break;

        r.start = i;
        r.format = formatChanges.at(i);

        while (i < formatChanges.count() && formatChanges.at(i) == r.format)
            ++i;

        if (i >= formatChanges.count())
            break;

        r.length = i - r.start;

        if (r.start >= preeditAreaStart) {
            r.start += preeditAreaLength;
        } else if (r.start + r.length >= preeditAreaStart) {
            r.length += preeditAreaLength;
        }

        ranges << r;
        r.start = r.length = -1;
    }

    if (r.start != -1) {
        r.length = formatChanges.count() - r.start;

        if (r.start >= preeditAreaStart) {
            r.start += preeditAreaLength;
        } else if (r.start + r.length >= preeditAreaStart) {
            r.length += preeditAreaLength;
        }

        ranges << r;
    }

    layout->setAdditionalFormats(ranges);
}

void TestDocumentLayout::testNumberedList()
{
    initForNewTest("Base\nListItem1\nListItem2\nListItem3\nListItem4\nListItem5\nListItem6\nListItem6\nListItem7\nListItem8\nListItem9\nListItem10\nListItem11\nListItem12\n");

    KoParagraphStyle style;
    m_styleManager->add(&style);
    QTextBlock block = m_doc->begin();
    style.applyStyle(block);
    block = block.next();

    KoListStyle listStyle;
    KoListLevelProperties llp;
    llp.setStyle(KoListStyle::DecimalItem);
    listStyle.setLevelProperties(llp);
    style.setListStyle(&listStyle);

    QTextList *previous = 0;
    int i;
    for (i = 1; i <= 9; i++) {
        QVERIFY(block.isValid());
        // qDebug() << "->" << block.text();
        style.applyStyle(block);
        QTextList *textList = block.textList();
        QVERIFY(textList);
        if (previous == 0) {
            previous = textList;
        } else {
            QCOMPARE(textList, previous);
        }
        QCOMPARE(textList->format().intProperty(QTextListFormat::ListStyle), (int)(KoListStyle::DecimalItem));
        block = block.next();
    }
    m_layout->layout();
    QTextLayout *blockLayout = m_block.layout();

    QCOMPARE(blockLayout->lineAt(0).x(), 0.0);
    QTextBlock blok = m_doc->begin().next();
    qreal indent = blok.layout()->lineAt(0).x();
    QVERIFY(indent > 0.0);
    for (i = 1; i <= 9; ++i) {
        // qDebug() << "=>" << blok.text();
        QTextList *textList = blok.textList();
        QVERIFY(textList);
        QCOMPARE(blok.layout()->lineAt(0).x(), indent); // all the same indent.
        blok = blok.next();
    }

    // now make number of listitems be more than 10, so we use 2 digits.
    for (i = 9; i <= 12; ++i) {
        QVERIFY(block.isValid());
        style.applyStyle(block);
        // qDebug() << "->" << block.text();
        block = block.next();
    }
    m_layout->layout();
    blockLayout = m_block.layout();

    QCOMPARE(blockLayout->lineAt(0).x(), 0.0);
    blok = m_doc->begin().next();
    qreal indent2 = blok.layout()->lineAt(0).x();
    QVERIFY(indent2 > indent); // since it takes an extra digit
    for (i = 2; i <= 12; ++i) {
        // qDebug() << "=>" << blok.text();
        QCOMPARE(blok.layout()->lineAt(0).x(), indent2); // all the same indent.
        blok = blok.next();
    }

    // now to make sure the text is actually properly set.
    block = m_doc->begin().next();
    i = 1;
    while (block.isValid() && i < 13) {
        KoTextBlockData *data = dynamic_cast<KoTextBlockData *>(block.userData());
        QVERIFY(data);
        QCOMPARE(data->counterText(), QString::number(i++));
        block = block.next();
    }

    llp.setListItemSuffix(".");
    llp.setStartValue(4);
    listStyle.setLevelProperties(llp);

    QTextCursor cursor(m_doc);
    cursor.setPosition(10); // listItem1
    QTextBlockFormat format = cursor.blockFormat();
    format.setProperty(KoParagraphStyle::ListStartValue, 4);
    cursor.setBlockFormat(format);

    cursor.setPosition(40); // listItem4
    format = cursor.blockFormat();
    format.setProperty(KoParagraphStyle::ListStartValue, 12);
    cursor.setBlockFormat(format);

    // at this point we start numbering at 4. Have 4, 5, 6, 12, 13, 14, 15 etc
    m_layout->layout();

    // now to make sur the text is actually properly set.
    block = m_doc->begin().next();
    i = 4;
    while (block.isValid() && i < 22) {
        if (i == 7) {
//.........这里部分代码省略.........

void HGMarkdownHighlighter::highlight()
{
    if (cached_elements == NULL) {
        qDebug() << "cached_elements is NULL";
        return;
    }

    if (highlightingStyles == NULL)
        this->setDefaultStyles();

    this->clearFormatting();

    for (int i = 0; i < highlightingStyles->size(); i++)
    {
        HighlightingStyle style = highlightingStyles->at(i);
        pmh_element *elem_cursor = cached_elements[style.type];
        while (elem_cursor != NULL)
        {
            if (elem_cursor->end <= elem_cursor->pos) {
                elem_cursor = elem_cursor->next;
                continue;
            }

            // "The QTextLayout object can only be modified from the
            // documentChanged implementation of a QAbstractTextDocumentLayout
            // subclass. Any changes applied from the outside cause undefined
            // behavior." -- we are breaking this rule here. There might be
            // a better (more correct) way to do this.

            int startBlockNum = document->findBlock(elem_cursor->pos).blockNumber();
            int endBlockNum = document->findBlock(elem_cursor->end).blockNumber();
            for (int j = startBlockNum; j <= endBlockNum; j++)
            {
                QTextBlock block = document->findBlockByNumber(j);

                QTextLayout *layout = block.layout();
                QList<QTextLayout::FormatRange> list = layout->additionalFormats();
                int blockpos = block.position();
                QTextLayout::FormatRange r;
                r.format = style.format;

                if (j == startBlockNum) {
                    r.start = elem_cursor->pos - blockpos;
                    r.length = (startBlockNum == endBlockNum)
                                ? elem_cursor->end - elem_cursor->pos
                                : block.length() - r.start;
                } else if (j == endBlockNum) {
                    r.start = 0;
                    r.length = elem_cursor->end - blockpos;
                } else {
                    r.start = 0;
                    r.length = block.length();
                }

                list.append(r);
                layout->setAdditionalFormats(list);
            }

            elem_cursor = elem_cursor->next;
        }
    }

    document->markContentsDirty(0, document->characterCount());
}

void DTPatientListDelegate::drawHightlightText(QPainter *painter,
                                               QString text,
                                               QString substring,
                                               QRect pos,
                                               Qt::CaseSensitivity cs,
                                               bool boldFont,
                                               QColor highlight) const
{
    if (!painter || (text.length() == 0))
        return;

    painter->save();
    QVector<QTextLayout::FormatRange> selections;
    QTextLayout textLayout;
    textLayout.setText(text);

    if (substring.length() != 0)
    {
        int idx = -1;
        int start = 0;
        while (1)
        {
            idx = text.indexOf(substring, start,cs);
            if (idx == -1)
                break;

            QTextLayout::FormatRange* range = new QTextLayout::FormatRange;
            range->start = idx;
            range->length = substring.length();
            range->format.setBackground(QBrush(QColor(highlight)));
            selections.append(*range);
            start += substring.length();
        }
    }

    if (boldFont)
    {
        QFont f = textLayout.font();
        f.setBold(true);
        textLayout.setFont(f);
    }

    int leading = painter->fontMetrics().leading();
    qreal height = 0;
    textLayout.beginLayout();
    while (1) {
        QTextLine line = textLayout.createLine();
        if (!line.isValid())
            break;

        line.setLineWidth(pos.width());
        height += leading;
        line.setPosition(QPointF(0, height));
        height += line.height();
    }
    textLayout.endLayout();

    textLayout.draw(painter, pos.topLeft(), selections);

    painter->restore();

}

void TextDocumentLayout::layoutBlock(const QTextBlock &block)
{
    QTextDocument *doc = document();
    qreal margin = doc->documentMargin();
    qreal blockMaximumWidth = 0;

    qreal height = 0;
    QTextLayout *tl = block.layout();
    QTextOption option = doc->defaultTextOption();
    tl->setTextOption(option);

    int extraMargin = 0;
    if (option.flags() & QTextOption::AddSpaceForLineAndParagraphSeparators) {
        QFontMetrics fm(block.charFormat().font());
        extraMargin += fm.width(QChar(0x21B5));
    }
    tl->beginLayout();
    qreal availableWidth = d->width;
    if (availableWidth <= 0) {
        availableWidth = qreal(INT_MAX); // similar to text edit with pageSize.width == 0
    }
    availableWidth -= 2*margin + extraMargin;
    qreal indentMargin = 0;
    while (1) {
        QTextLine line = tl->createLine();
        if (!line.isValid())
            break;
        line.setLeadingIncluded(true);
        line.setLineWidth(availableWidth - indentMargin);
        line.setPosition(QPointF(margin + indentMargin, height));
        if(!height) //enter only in the first iteration
        {
            indentMargin = indentWidth(block);
        }
        height += line.height();
        blockMaximumWidth = qMax(blockMaximumWidth, line.naturalTextWidth() + 2*margin);
    }
    tl->endLayout();

    int previousLineCount = doc->lineCount();
    const_cast<QTextBlock&>(block).setLineCount(block.isVisible() ? tl->lineCount() : 0);
    int lineCount = doc->lineCount();

    bool emitDocumentSizeChanged = previousLineCount != lineCount;
    if (blockMaximumWidth > d->maximumWidth) {
        // new longest line
        d->maximumWidth = blockMaximumWidth;
        d->maximumWidthBlockNumber = block.blockNumber();
        emitDocumentSizeChanged = true;
    } else if (block.blockNumber() == d->maximumWidthBlockNumber && blockMaximumWidth < d->maximumWidth) {
        // longest line shrinking
        QTextBlock b = doc->firstBlock();
        d->maximumWidth = 0;
        QTextBlock maximumBlock;
        while (b.isValid()) {
            qreal blockMaximumWidth = blockWidth(b);
            if (blockMaximumWidth > d->maximumWidth) {
                d->maximumWidth = blockMaximumWidth;
                maximumBlock = b;
            }
            b = b.next();
        }
        if (maximumBlock.isValid()) {
            d->maximumWidthBlockNumber = maximumBlock.blockNumber();
            emitDocumentSizeChanged = true;
        }
    }
    if (emitDocumentSizeChanged)// && !d->blockDocumentSizeChanged)
        emit documentSizeChanged(documentSize());

    emit updateBlock(block);
}

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.........

// copied from QItemDelegate to be able to add the 'format' parameter
void HighlightingItemDelegate::drawDisplay(QPainter *painter,
                                           const QStyleOptionViewItem &option,
                                           const QRect &rect, const QString &text,
                                           const QVector<QTextLayout::FormatRange> &format) const
{
    QPalette::ColorGroup cg = option.state & QStyle::State_Enabled
                              ? QPalette::Normal : QPalette::Disabled;
    if (cg == QPalette::Normal && !(option.state & QStyle::State_Active))
        cg = QPalette::Inactive;
    if (option.state & QStyle::State_Selected) {
        painter->fillRect(rect, option.palette.brush(cg, QPalette::Highlight));
        painter->setPen(option.palette.color(cg, QPalette::HighlightedText));
    } else {
        painter->setPen(option.palette.color(cg, QPalette::Text));
    }

    if (text.isEmpty())
        return;

    if (option.state & QStyle::State_Editing) {
        painter->save();
        painter->setPen(option.palette.color(cg, QPalette::Text));
        painter->drawRect(rect.adjusted(0, 0, -1, -1));
        painter->restore();
    }

    const QStyleOptionViewItem opt = option;

    const QWidget *widget = option.widget;
    QStyle *style = widget ? widget->style() : QApplication::style();
    const int textMargin = style->pixelMetric(QStyle::PM_FocusFrameHMargin, nullptr, widget) + 1;
    QRect textRect = rect.adjusted(textMargin, 0, -textMargin, 0); // remove width padding
    const bool wrapText = opt.features & QStyleOptionViewItem::WrapText;
    QTextOption textOption;
    textOption.setWrapMode(wrapText ? QTextOption::WordWrap : QTextOption::ManualWrap);
    textOption.setTextDirection(option.direction);
    textOption.setAlignment(QStyle::visualAlignment(option.direction, option.displayAlignment));
    QTextLayout textLayout;
    textLayout.setTextOption(textOption);
    textLayout.setFont(option.font);
    textLayout.setText(replaceNewLine(text));

    QSizeF textLayoutSize = doTextLayout(&textLayout, textRect.width());

    if (textRect.width() < textLayoutSize.width()
        || textRect.height() < textLayoutSize.height()) {
        QString elided;
        int start = 0;
        int end = text.indexOf(QChar::LineSeparator, start);
        if (end == -1) {
            elided += option.fontMetrics.elidedText(text, option.textElideMode, textRect.width());
        } else {
            while (end != -1) {
                elided += option.fontMetrics.elidedText(text.mid(start, end - start),
                                                        option.textElideMode, textRect.width());
                elided += QChar::LineSeparator;
                start = end + 1;
                end = text.indexOf(QChar::LineSeparator, start);
            }
            // let's add the last line (after the last QChar::LineSeparator)
            elided += option.fontMetrics.elidedText(text.mid(start),
                                                    option.textElideMode, textRect.width());
        }
        textLayout.setText(elided);
        textLayoutSize = doTextLayout(&textLayout, textRect.width());
    }

    const QSize layoutSize(textRect.width(), int(textLayoutSize.height()));
    const QRect layoutRect = QStyle::alignedRect(option.direction, option.displayAlignment,
                                                  layoutSize, textRect);
    // if we still overflow even after eliding the text, enable clipping
    if (!hasClipping() && (textRect.width() < textLayoutSize.width()
                           || textRect.height() < textLayoutSize.height())) {
        painter->save();
        painter->setClipRect(layoutRect);
        textLayout.draw(painter, layoutRect.topLeft(), format, layoutRect);
        painter->restore();
    } else {
        textLayout.draw(painter, layoutRect.topLeft(), format, layoutRect);
    }
}

//.........这里部分代码省略.........
	
	textHighlightRect.adjust ( 0,iconSize + 5,0,0 );

	// draw background
	{
		QSize textSize = viewItemTextSize ( &opt );
		QPalette::ColorGroup cg;
		QStyleOptionViewItemV4 opt2(opt);
		
		if((opt.widget && opt.widget->isEnabled()) || (opt.state & QStyle::State_Enabled))
		{
			if(! ( opt.state & QStyle::State_Active ))
				cg = QPalette::Inactive;
			else
				cg = QPalette::Normal;
		}
		else
		{
			cg = QPalette::Disabled;
		}
		opt2.palette.setCurrentColorGroup(cg);
		
		// fill in background, if any
		if ( opt.backgroundBrush.style() != Qt::NoBrush )
		{
			QPointF oldBO = painter->brushOrigin();
			painter->setBrushOrigin ( opt.rect.topLeft() );
			painter->fillRect ( opt.rect, opt.backgroundBrush );
			painter->setBrushOrigin ( oldBO );
		}
		
		if ( opt.showDecorationSelected )
		{
			drawSelectionRect(painter,opt2, opt.rect);
			drawFocusRect(painter,opt2, opt.rect);
			//painter->fillRect ( opt.rect, opt.palette.brush ( cg, QPalette::Highlight ) );
		}
		else
		{
			
			//if ( opt.state & QStyle::State_Selected )
			{
				//QRect textRect = subElementRect ( QStyle::SE_ItemViewItemText,  opt, opt.widget );
				//painter->fillRect ( textHighlightRect, opt.palette.brush ( cg, QPalette::Highlight ) );
				drawSelectionRect(painter,opt2, textHighlightRect);
				drawFocusRect(painter,opt2, textHighlightRect);
			}
		}
	}

	// draw the icon
	{
		QIcon::Mode mode = QIcon::Normal;
		if ( ! ( opt.state & QStyle::State_Enabled ) )
			mode = QIcon::Disabled;
		else if ( opt.state & QStyle::State_Selected )
			mode = QIcon::Selected;
		QIcon::State state = opt.state & QStyle::State_Open ? QIcon::On : QIcon::Off;

		iconbox.setHeight ( iconSize );
		opt.icon.paint ( painter, iconbox, Qt::AlignCenter, mode, state );
	}
	// set the text colors
	QPalette::ColorGroup cg = opt.state & QStyle::State_Enabled ? QPalette::Normal : QPalette::Disabled;
	if ( cg == QPalette::Normal && ! ( opt.state & QStyle::State_Active ) )
		cg = QPalette::Inactive;
	if ( opt.state & QStyle::State_Selected )
	{
		painter->setPen ( opt.palette.color ( cg, QPalette::HighlightedText ) );
	}
	else
	{
		painter->setPen ( opt.palette.color ( cg, QPalette::Text ) );
	}

	// draw the text
	QTextOption textOption;
	textOption.setWrapMode ( QTextOption::WrapAtWordBoundaryOrAnywhere );
	textOption.setTextDirection ( opt.direction );
	textOption.setAlignment ( QStyle::visualAlignment ( opt.direction, opt.displayAlignment ) );
	QTextLayout textLayout;
	textLayout.setTextOption ( textOption );
	textLayout.setFont ( opt.font );
	textLayout.setText ( opt.text );

	qreal width, height;
	viewItemTextLayout ( textLayout, iconbox.width(), height, width );

	const int lineCount = textLayout.lineCount();

	const QRect layoutRect = QStyle::alignedRect ( opt.direction, opt.displayAlignment, QSize ( iconbox.width(), int ( height ) ), textRect );
	const QPointF position = layoutRect.topLeft();
	for ( int i = 0; i < lineCount; ++i )
	{
		const QTextLine line = textLayout.lineAt ( i );
		line.draw ( painter, position );
	}

	painter->restore();
}

void Text::layout()
      {
#if 0
      QSizeF pageSize(-1.0, 1000000);
      setPos(0.0, 0.0);
      if (parent() && _layoutToParentWidth) {
            pageSize.setWidth(parent()->width());
            if (parent()->type() == HBOX || parent()->type() == VBOX || parent()->type() == TBOX) {
                  Box* box = static_cast<Box*>(parent());
                  rxpos() += box->leftMargin() * DPMM;
                  rypos() += box->topMargin() * DPMM;
                  // pageSize.setHeight(box->height() - (box->topMargin() + box->bottomMargin()) * DPMM);
                  pageSize.setWidth(box->width()   - (box->leftMargin() + box->rightMargin()) * DPMM);
                  }
            }

      QTextOption to = _doc->defaultTextOption();
      to.setUseDesignMetrics(true);
      to.setWrapMode(pageSize.width() <= 0.0 ? QTextOption::NoWrap : QTextOption::WrapAtWordBoundaryOrAnywhere);
      _doc->setDefaultTextOption(to);

      if (pageSize.width() <= 0.0)
            _doc->setTextWidth(_doc->idealWidth());
      else
            _doc->setPageSize(pageSize);

      if (hasFrame()) {
            frame = QRectF();
            for (QTextBlock tb = _doc->begin(); tb.isValid(); tb = tb.next()) {
                  QTextLayout* tl = tb.layout();
                  int n = tl->lineCount();
                  for (int i = 0; i < n; ++i)
                        // frame |= tl->lineAt(0).naturalTextRect().translated(tl->position());
                        frame |= tl->lineAt(0).rect().translated(tl->position());
                  }
            if (circle()) {
                  if (frame.width() > frame.height()) {
                        frame.setY(frame.y() + (frame.width() - frame.height()) * -.5);
                        frame.setHeight(frame.width());
                        }
                  else {
                        frame.setX(frame.x() + (frame.height() - frame.width()) * -.5);
                        frame.setWidth(frame.height());
                        }
                  }
            qreal w = (paddingWidth() + frameWidth() * .5) * DPMM;
            frame.adjust(-w, -w, w, w);
            w = frameWidth() * DPMM;
            _bbox = frame.adjusted(-w, -w, w, w);
            }
      else {
            _bbox = QRectF(QPointF(0.0, 0.0), _doc->size()); //_doc->documentLayout()->frameBoundingRect(_doc->rootFrame());
            }
      _doc->setModified(false);
      style().layout(this);      // process alignment

      if ((style().align() & ALIGN_VCENTER) && (subtype() == TEXT_TEXTLINE)) {
            // special case: vertically centered text with TextLine needs to
            // take into account the line width
            TextLineSegment* tls = (TextLineSegment*)parent();
            TextLine* tl = (TextLine*)(tls->line());
            qreal textlineLineWidth = point(tl->lineWidth());
            rypos() -= textlineLineWidth * .5;
            }

      if (parent() == 0)
            return;
      if (parent()->type() == SEGMENT) {
            Segment* s = static_cast<Segment*>(parent());
            rypos() += s ? s->measure()->system()->staff(staffIdx())->y() : 0.0;
            }
#endif
      Font f = style().font(spatium());
      qreal asc, desc, leading;
      qreal w = textMetrics(f.family(), _text, f.size(), &asc, &desc, &leading);

// printf("text(%s) asc %f desc %f leading %f  w %f\n", qPrintable(_text), asc, desc, leading, w);
      _lineHeight  = asc + desc;
      _lineSpacing = _lineHeight + leading;
      _baseLine    = asc;

      setbbox(QRectF(0.0, -asc, w, _lineHeight));
#if 0
      if (parent() && _layoutToParentWidth) {
            qreal wi = parent()->width();
            qreal ph = parent()->height();
            qreal x;
            qreal y = pos.y();
            if (align() & ALIGN_HCENTER)
                  x = (wi - w) * .5;
            else if (align() & ALIGN_RIGHT)
                  x = wi - w;
            else
                  x = 0.0;
            if (align() & ALIGN_VCENTER)
                  y = (ph - asc) * .5;
            else if (align() & ALIGN_BOTTOM)
                  y = ph - asc;
            else
                  y = asc;
//.........这里部分代码省略.........

void BaseEditor::paintEvent(QPaintEvent *e)
{
    //copy from QPlainTextEditor
    QPainter painter(viewport());
    Q_ASSERT(qobject_cast<QPlainTextDocumentLayout*>(document()->documentLayout()));

    QPointF offset(contentOffset());

    QRect er = e->rect();
    QRect viewportRect = viewport()->rect();

    bool editable = !isReadOnly();

    QTextBlock block = firstVisibleBlock();
    qreal maximumWidth = document()->documentLayout()->documentSize().width();

    //margin
    qreal lineX = 0;
    if (conf->isDisplayRightColumnMargin()) {
        // Don't use QFontMetricsF::averageCharWidth here, due to it returning
        // a fractional size even when this is not supported by the platform.
        lineX = QFontMetricsF(document()->defaultFont()).width(QLatin1Char('X')) * conf->getRightMarginColumn() + offset.x() + 4;

        if (lineX < viewportRect.width()) {
            const QBrush background = QBrush(QColor(239, 239, 239));
            painter.fillRect(QRectF(lineX, er.top(), viewportRect.width() - lineX, er.height()),
                             background);

            const QColor col = (palette().base().color().value() > 128) ? Qt::black : Qt::white;
            const QPen pen = painter.pen();
            painter.setPen(blendColors(background.isOpaque() ? background.color() : palette().base().color(),
                                       col, 32));
            painter.drawLine(QPointF(lineX, er.top()), QPointF(lineX, er.bottom()));
            painter.setPen(pen);
        }
    }

    // Set a brush origin so that the WaveUnderline knows where the wave started
    painter.setBrushOrigin(offset);

    // keep right margin clean from full-width selection
    int maxX = offset.x() + qMax((qreal)viewportRect.width(), maximumWidth)
               - document()->documentMargin();
    er.setRight(qMin(er.right(), maxX));
    painter.setClipRect(er);


    QAbstractTextDocumentLayout::PaintContext context = getPaintContext();

    while (block.isValid()) {

        QRectF r = blockBoundingRect(block).translated(offset);
        QTextLayout *layout = block.layout();

        if (!block.isVisible()) {
            offset.ry() += r.height();
            block = block.next();
            continue;
        }

        if (r.bottom() >= er.top() && r.top() <= er.bottom()) {

            QTextBlockFormat blockFormat = block.blockFormat();

            QBrush bg = blockFormat.background();
            if (bg != Qt::NoBrush) {
                QRectF contentsRect = r;
                contentsRect.setWidth(qMax(r.width(), maximumWidth));
                fillBackground(&painter, contentsRect, bg);
            }


            QVector<QTextLayout::FormatRange> selections;
            int blpos = block.position();
            int bllen = block.length();
            for (int i = 0; i < context.selections.size(); ++i) {
                const QAbstractTextDocumentLayout::Selection &range = context.selections.at(i);
                const int selStart = range.cursor.selectionStart() - blpos;
                const int selEnd = range.cursor.selectionEnd() - blpos;
                if (selStart < bllen && selEnd > 0
                    && selEnd > selStart) {
                    QTextLayout::FormatRange o;
                    o.start = selStart;
                    o.length = selEnd - selStart;
                    o.format = range.format;
                    selections.append(o);
                } else if (!range.cursor.hasSelection() && range.format.hasProperty(QTextFormat::FullWidthSelection)
                           && block.contains(range.cursor.position())) {
                    // for full width selections we don't require an actual selection, just
                    // a position to specify the line. that's more convenience in usage.
                    QTextLayout::FormatRange o;
                    QTextLine l = layout->lineForTextPosition(range.cursor.position() - blpos);
                    o.start = l.textStart();
                    o.length = l.textLength();
                    if (o.start + o.length == bllen - 1)
                        ++o.length; // include newline
                    o.format = range.format;
                    selections.append(o);
                }
            }
//.........这里部分代码省略.........

void ScCodeEditor::blinkCode( const QTextCursor & c )
{
    if( !c.document() || !c.hasSelection() ) return;

    Settings::Manager *settings = Main::settings();
    QTextCharFormat evalCodeTextFormat = settings->getThemeVal("evaluatedCode");

    QTextDocument *doc = c.document();

    int startPos = c.selectionStart();
    int endPos = c.selectionEnd();
    QTextBlock startBlock = doc->findBlock(startPos);
    QTextBlock endBlock = doc->findBlock(endPos);
    startPos -= startBlock.position();
    endPos -= endBlock.position();

    // Get the bounds of visible blocks within the cursor's selection:

    QTextBlock block = firstVisibleBlock();
    int idx = block.blockNumber();
    int sidx = startBlock.blockNumber();

    QTextBlock firstBlock, lastBlock;
    firstBlock = lastBlock = block;

    QRectF geom = blockBoundingGeometry(block).translated(contentOffset());
    qreal top = geom.top();
    qreal bottom = top;
    qreal width=0;

    while(block.isValid() && bottom < viewport()->rect().height())
    {
        if(block.isVisible())
        {
            QTextLayout *l = block.layout();
            QRectF r = l->boundingRect();
            bottom += r.height();
            if(idx < sidx) {
                // Block not within the selection. Will skip it.
                top = bottom;
            }
            else {
                // Block within the selection.
                width = qMax(width, l->maximumWidth() + r.left());
            }
        }

        if(block == endBlock) break;

        block = block.next();
        ++idx;
        if(top == bottom)
            firstBlock = block;
    }

    lastBlock = block;

    if(bottom == top) {
        //qDebug("no visible block.");
        return;
    }

    // Construct a pixmap to render the code on:

    QPixmap pix( QSize(qCeil(width), qCeil(bottom - top)) );
    pix.fill(QColor(0,0,0,0));

    // Render the visible blocks:

    QPainter painter(&pix);
    QVector<QTextLayout::FormatRange> selections;
    block = firstBlock;
    int y=0;
    while( block.isValid() )
    {
        if (block.isVisible())
        {
            QRectF blockRect = block.layout()->boundingRect();

            // Use extra char formatting to hide code outside of selection
            // and modify the appearance of selected code:

            QTextLayout::FormatRange range;
            selections.clear();

            int start = 0;
            if(block == startBlock) {
                range.start = 0;
                range.length = startPos;
                range.format.setForeground(QColor(0,0,0,0));
                range.format.setBackground(Qt::NoBrush);
                selections.append(range);
                start = startPos;
            }

            range.start = start;
            range.length = (block == endBlock ? endPos : block.length() - 1) - range.start;
            range.format = evalCodeTextFormat;
            selections.append(range);

//.........这里部分代码省略.........

void MarkdownHighlighter::resultReady(pmh_element **elements)
{
    QTextBlock block = document()->firstBlock();
    while (block.isValid()) {
        block.layout()->clearAdditionalFormats();
        block = block.next();
    }

    if (!elements) {
        qDebug() << "elements is null";
        return;
    }

    // QTextDocument::characterCount returns a value one higher than the
    // actual character count.
    // See: https://bugreports.qt.nokia.com//browse/QTBUG-4841
    // document->toPlainText().length() would give us the correct value
    // but it's probably too slow.
    unsigned long max_offset = document()->characterCount() - 1;

    for (int i = 0; i < highlightingStyles.size(); i++)
    {
        HighlightingStyle style = highlightingStyles.at(i);
        pmh_element *elem_cursor = elements[style.type];
        while (elem_cursor != NULL)
        {
            unsigned long pos = elem_cursor->pos;
            unsigned long end = elem_cursor->end;

            if (end <= pos || max_offset < pos)
            {
                elem_cursor = elem_cursor->next;
                continue;
            }

            if (max_offset < end)
                end = max_offset;

            // "The QTextLayout object can only be modified from the
            // documentChanged implementation of a QAbstractTextDocumentLayout
            // subclass. Any changes applied from the outside cause undefined
            // behavior." -- we are breaking this rule here. There might be
            // a better (more correct) way to do this.

            int startBlockNum = document()->findBlock(pos).blockNumber();
            int endBlockNum = document()->findBlock(end).blockNumber();
            for (int j = startBlockNum; j <= endBlockNum; j++)
            {
                QTextBlock block = document()->findBlockByNumber(j);

                QTextLayout *layout = block.layout();
                QList<QTextLayout::FormatRange> list = layout->additionalFormats();
                int blockpos = block.position();
                QTextLayout::FormatRange r;
                r.format = style.format;

                if (/*_makeLinksClickable
                    &&*/ (elem_cursor->type == pmh_LINK
                        || elem_cursor->type == pmh_AUTO_LINK_URL
                        || elem_cursor->type == pmh_AUTO_LINK_EMAIL
                        || elem_cursor->type == pmh_REFERENCE)
                    && elem_cursor->address != NULL)
                {
                    QString address(elem_cursor->address);
                    if (elem_cursor->type == pmh_AUTO_LINK_EMAIL && !address.startsWith("mailto:"))
                        address = "mailto:" + address;
                    QTextCharFormat linkFormat(r.format);
                    linkFormat.setAnchor(true);
                    linkFormat.setAnchorHref(address);
                    linkFormat.setToolTip(address);
                    r.format = linkFormat;
                }

                if (j == startBlockNum) {
                    r.start = pos - blockpos;
                    r.length = (startBlockNum == endBlockNum)
                                ? end - pos
                                : block.length() - r.start;
                } else if (j == endBlockNum) {
                    r.start = 0;
                    r.length = end - blockpos;
                } else {
                    r.start = 0;
                    r.length = block.length();
                }

                list.append(r);
                layout->setAdditionalFormats(list);
            }

            elem_cursor = elem_cursor->next;
        }
    }

    document()->markContentsDirty(0, document()->characterCount());

    pmh_free_elements(elements);
}

 int CharBreakIteratorQt::previous() {
     if (currentPos == 0)
         return -1;
     currentPos = layout.previousCursorPosition(currentPos);
     return currentPos;
 }

 int CharBreakIteratorQt::next() {
     if (currentPos == length)
         return -1;
     currentPos = layout.nextCursorPosition(currentPos);
     return currentPos;
 }