qtextdocumentfragment.cpp

奇趣公司比较新的qt/emd版本

            case Html_ol:
            case Html_ul:
                if (lists.isEmpty())
                    break;
                lists.resize(lists.size() - 1);
                --indent;
                blockTagClosed = true;
                break;

            case Html_br:
                compressNextWhitespace = true;
                break;

            case Html_div:
                if (closedNode->children.isEmpty())
                    break;
                // fall through
            default:
                if (closedNode->isBlock())
                    blockTagClosed = true;
                break;
        }

        closedNode = &at(closedNode->parent);
        --depth;
    }

    return blockTagClosed;
}

QTextHtmlImporter::Table QTextHtmlImporter::scanTable(int tableNodeIdx)
{
    Table table;
    table.columns = 0;

    QVector<QTextLength> columnWidths;

    int tableHeaderRowCount = 0;
    QVector<int> rowNodes;
    rowNodes.reserve(at(tableNodeIdx).children.count());
    foreach (int row, at(tableNodeIdx).children)
        switch (at(row).id) {
            case Html_tr:
                rowNodes += row;
                break;
            case Html_thead:
            case Html_tbody:
            case Html_tfoot:
                foreach (int potentialRow, at(row).children)
                    if (at(potentialRow).id == Html_tr) {
                        rowNodes += potentialRow;
                        if (at(row).id == Html_thead)
                            ++tableHeaderRowCount;
                    }
                break;
            default: break;
        }

    QVector<RowColSpanInfo> rowColSpans;
    QVector<RowColSpanInfo> rowColSpanForColumn;

    int effectiveRow = 0;
    foreach (int row, rowNodes) {
        int colsInRow = 0;

        foreach (int cell, at(row).children)
            if (at(cell).isTableCell()) {
                // skip all columns with spans from previous rows
                while (colsInRow < rowColSpanForColumn.size()) {
                    const RowColSpanInfo &spanInfo = rowColSpanForColumn[colsInRow];

                    if (spanInfo.row + spanInfo.rowSpan > effectiveRow) {
                        Q_ASSERT(spanInfo.col == colsInRow);
                        colsInRow += spanInfo.colSpan;
                    } else
                        break;
                }

                const QTextHtmlParserNode &c = at(cell);
                const int currentColumn = colsInRow;
                colsInRow += c.tableCellColSpan;

                RowColSpanInfo spanInfo;
                spanInfo.row = effectiveRow;
                spanInfo.col = currentColumn;
                spanInfo.colSpan = c.tableCellColSpan;
                spanInfo.rowSpan = c.tableCellRowSpan;
                if (spanInfo.colSpan > 1 || spanInfo.rowSpan > 1)
                    rowColSpans.append(spanInfo);

                columnWidths.resize(qMax(columnWidths.count(), colsInRow));
                rowColSpanForColumn.resize(columnWidths.size());
                for (int i = currentColumn; i < currentColumn + c.tableCellColSpan; ++i) {
                    if (columnWidths.at(i).type() == QTextLength::VariableLength)
                        columnWidths[i] = c.width;
                    rowColSpanForColumn[i] = spanInfo;
                }
            }

        table.columns = qMax(table.columns, colsInRow);

        ++effectiveRow;
    }
    table.rows = effectiveRow;

    table.lastIndent = indent;
    indent = 0;

    if (table.rows == 0 || table.columns == 0)
        return table;

    QTextFrameFormat fmt;
    const QTextHtmlParserNode &node = at(tableNodeIdx);

    if (!node.isTextFrame) {
        QTextTableFormat tableFmt;
        tableFmt.setCellSpacing(node.tableCellSpacing);
        tableFmt.setCellPadding(node.tableCellPadding);
        if (node.blockFormat.hasProperty(QTextFormat::BlockAlignment))
            tableFmt.setAlignment(node.blockFormat.alignment());
        tableFmt.setColumns(table.columns);
        tableFmt.setColumnWidthConstraints(columnWidths);
        tableFmt.setHeaderRowCount(tableHeaderRowCount);
        fmt = tableFmt;
    }

    fmt.setTopMargin(topMargin(tableNodeIdx));
    fmt.setBottomMargin(bottomMargin(tableNodeIdx));
    fmt.setLeftMargin(leftMargin(tableNodeIdx)
                      + table.lastIndent * 40 // ##### not a good emulation
                      );
    fmt.setRightMargin(rightMargin(tableNodeIdx));

    // compatibility
    if (qFuzzyCompare(fmt.leftMargin(), fmt.rightMargin())
        && qFuzzyCompare(fmt.leftMargin(), fmt.topMargin())
        && qFuzzyCompare(fmt.leftMargin(), fmt.bottomMargin()))
        fmt.setProperty(QTextFormat::FrameMargin, fmt.leftMargin());

    fmt.setBorderStyle(node.borderStyle);
    fmt.setBorderBrush(node.borderBrush);
    fmt.setBorder(node.tableBorder);
    fmt.setWidth(node.width);
    fmt.setHeight(node.height);
    if (node.blockFormat.hasProperty(QTextFormat::PageBreakPolicy))
        fmt.setPageBreakPolicy(node.blockFormat.pageBreakPolicy());

    if (node.blockFormat.hasProperty(QTextFormat::LayoutDirection))
        fmt.setLayoutDirection(node.blockFormat.layoutDirection());
    if (node.charFormat.background().style() != Qt::NoBrush)
        fmt.setBackground(node.charFormat.background());
    fmt.setPosition(QTextFrameFormat::Position(node.cssFloat));

    if (node.isTextFrame) {
        if (node.isRootFrame) {
            table.frame = cursor.currentFrame();
            table.frame->setFrameFormat(fmt);
        } else
            table.frame = cursor.insertFrame(fmt);

        table.isTextFrame = true;
    } else {
        const int oldPos = cursor.position();
        QTextTable *textTable = cursor.insertTable(table.rows, table.columns, fmt.toTableFormat());
        table.frame = textTable;

        for (int i = 0; i < rowColSpans.count(); ++i) {
            const RowColSpanInfo &nfo = rowColSpans.at(i);
            textTable->mergeCells(nfo.row, nfo.col, nfo.rowSpan, nfo.colSpan);
        }

        table.currentCell = TableCellIterator(textTable);
        cursor.setPosition(oldPos); // restore for caption support which needs to be inserted right before the table
    }
    return table;
}

QTextHtmlImporter::ProcessNodeResult QTextHtmlImporter::processBlockNode()
{
    QTextBlockFormat block;
    QTextCharFormat charFmt;
    bool modifiedBlockFormat = true;
    bool modifiedCharFormat = true;

    if (currentNode->isTableCell() && !tables.isEmpty()) {
        Table &t = tables.last();
        if (!t.isTextFrame && !t.currentCell.atEnd()) {
            const QTextTableCell cell = t.currentCell.cell();
            if (cell.isValid())
                cursor.setPosition(cell.firstPosition());
        }
        hasBlock = true;
        compressNextWhitespace = true;

        if (currentNode->charFormat.background().style() != Qt::NoBrush) {
            charFmt.setBackground(currentNode->charFormat.background());
            cursor.mergeBlockCharFormat(charFmt);
        }
    }

    if (hasBlock) {
        block = cursor.blockFormat();
        charFmt = cursor.blockCharFormat();
        modifiedBlockFormat = false;
        modifiedCharFormat = false;
    }

    // collapse
    {
        qreal tm = qreal(topMargin(currentNodeIdx));
        if (tm > block.topMargin()) {
            block.setTopMargin(tm);
            modifiedBlockFormat = true;
        }
    }

    int bottomMargin = this->bottomMargin(currentNodeIdx);

    // for list items we may want to collapse with the bottom margin of the
    // list.
    const QTextHtmlParserNode *parentNode = currentNode->parent ? &at(currentNode->parent) : 0;
    if ((currentNode->id == Html_li || currentNode->id == Html_dt || currentNode->id == Html_dd)
        && parentNode
        && (parentNode->isListStart() || parentNode->id == Html_dl)
        && (parentNode->children.last() == currentNodeIdx)) {
        bottomMargin = qMax(bottomMargin, this->bottomMargin(currentNode->parent));
    }

    if (block.bottomMargin() != bottomMargin) {
        block.setBottomMargin(bottomMargin);
        modifiedBlockFormat = true;
    }

    {
        const qreal lm = leftMargin(currentNodeIdx);
        const qreal rm = rightMargin(currentNodeIdx);

        if (block.leftMargin() != lm) {
            block.setLeftMargin(lm);
            modifiedBlockFormat = true;
        }
        if (block.rightMargin() != rm) {
            block.setRightMargin(rm);
            modifiedBlockFormat = true;
        }
    }

    if (currentNode->id != Html_li
        && indent != 0
        && (lists.isEmpty()
            || !hasBlock
            || !lists.last().list
            || lists.last().list->itemNumber(cursor.block()) == -1
           )
       ) {
        block.setIndent(indent);
        modifiedBlockFormat = true;
    }

    if (currentNode->blockFormat.propertyCount() > 0) {
        modifiedBlockFormat = true;
        block.merge(currentNode->blockFormat);
    }

    if (currentNode->charFormat.propertyCount() > 0) {
        modifiedCharFormat = true;
        charFmt.merge(currentNode->charFormat);
    }

    // ####################
    //                block.setFloatPosition(node->cssFloat);

    if (wsm == QTextHtmlParserNode::WhiteSpacePre) {
        block.setNonBreakableLines(true);
        modifiedBlockFormat = true;
    }

    if (currentNode->charFormat.background().style() != Qt::NoBrush && !currentNode->isTableCell()) {
        block.setBackground(currentNode->charFormat.background());
        modifiedBlockFormat = true;
    }

    if (hasBlock && (!currentNode->isEmptyParagraph || forceBlockMerging)) {
        if (modifiedBlockFormat)
            cursor.setBlockFormat(block);
        if (modifiedCharFormat)
            cursor.setBlockCharFormat(charFmt);
    } else {
        if (currentNodeIdx == 1 && cursor.position() == 0 && currentNode->isEmptyParagraph) {
            cursor.setBlockFormat(block);
            cursor.setBlockCharFormat(charFmt);
        } else {
            appendBlock(block, charFmt);
        }
    }

    if (currentNode->userState != -1)
        cursor.block().setUserState(currentNode->userState);

    if (currentNode->id == Html_li && !lists.isEmpty()) {
        List &l = lists.last();
        if (l.list) {
            l.list->add(cursor.block());
        } else {
            l.list = cursor.createList(l.format);
            const qreal listTopMargin = topMargin(l.listNode);
            if (listTopMargin > block.topMargin()) {
                block.setTopMargin(listTopMargin);
                cursor.mergeBlockFormat(block);
            }
        }
        if (hasBlock) {
            QTextBlockFormat fmt;
            fmt.setIndent(0);
            cursor.mergeBlockFormat(fmt);
        }
    }

    forceBlockMerging = false;
    if (currentNode->id == Html_body || currentNode->id == Html_html)
        forceBlockMerging = true;

    if (currentNode->isEmptyParagraph) {
        hasBlock = false;
        return ContinueWithNextNode;
    }

    hasBlock = true;
    blockTagClosed = false;
    return ContinueWithCurrentNode;
}

void QTextHtmlImporter::appendBlock(const QTextBlockFormat &format, QTextCharFormat charFmt)
{
    if (!namedAnchors.isEmpty()) {
        charFmt.setAnchor(true);
        charFmt.setAnchorNames(namedAnchors);
        namedAnchors.clear();
    }

    cursor.insertBlock(format, charFmt);

    if (!isPreservingWhitespaceMode(wsm))
        compressNextWhitespace = true;
}

/*!
    \fn QTextDocumentFragment QTextDocumentFragment::fromHtml(const QString &text)

    Returns a QTextDocumentFragment based on the arbitrary piece of
    HTML in the given \a text. The formatting is preserved as much as
    possible; for example, "<b>bold</b>" will become a document
    fragment with the text "bold" with a bold character format.
*/
QTextDocumentFragment QTextDocumentFragment::fromHtml(const QString &html)
{
    return fromHtml(html, 0);
}

/*!
    \fn QTextDocumentFragment QTextDocumentFragment::fromHtml(const QString &text, const QTextDocument *resourceProvider)
    \since 4.2

    Returns a QTextDocumentFragment based on the arbitrary piece of
    HTML in the given \a text. The formatting is preserved as much as
    possible; for example, "<b>bold</b>" will become a document
    fragment with the text "bold" with a bold character format.

    If the provided HTML contains references to external resources such as imported style sheets, then
    they will be loaded through the \a resourceProvider.
*/
QTextDocumentFragment QTextDocumentFragment::fromHtml(const QString &html, const QTextDocument *resourceProvider)
{
    QTextDocumentFragment res;
    res.d = new QTextDocumentFragmentPrivate;

    QTextHtmlImporter importer(res.d->doc, html, QTextHtmlImporter::ImportToFragment, resourceProvider);
    importer.import();
    return res;
}