C++ RenderTable::node方法代码示例

bool AXTable::isDataTable() const
{
    if (!m_renderer)
        return false;

    // Do not consider it a data table is it has an ARIA role.
    if (hasARIARole())
        return false;

    // When a section of the document is contentEditable, all tables should be
    // treated as data tables, otherwise users may not be able to work with rich
    // text editors that allow creating and editing tables.
    if (node() && node()->rendererIsEditable())
        return true;

    // This employs a heuristic to determine if this table should appear.
    // Only "data" tables should be exposed as tables.
    // Unfortunately, there is no good way to determine the difference
    // between a "layout" table and a "data" table.

    RenderTable* table = toRenderTable(m_renderer);
    Node* tableNode = table->node();
    if (!tableNode || !isHTMLTableElement(tableNode))
        return false;

    // if there is a caption element, summary, THEAD, or TFOOT section, it's most certainly a data table
    HTMLTableElement* tableElement = toHTMLTableElement(tableNode);
    if (!tableElement->summary().isEmpty() || tableElement->tHead() || tableElement->tFoot() || tableElement->caption())
        return true;

    // if someone used "rules" attribute than the table should appear
    if (!tableElement->rules().isEmpty())
        return true;

    // if there's a colgroup or col element, it's probably a data table.
    for (Node* child = tableElement->firstChild(); child; child = child->nextSibling()) {
        if (child->hasTagName(colTag) || child->hasTagName(colgroupTag))
            return true;
    }

    // go through the cell's and check for tell-tale signs of "data" table status
    // cells have borders, or use attributes like headers, abbr, scope or axis
    table->recalcSectionsIfNeeded();
    RenderTableSection* firstBody = table->firstBody();
    if (!firstBody)
        return false;

    int numCols = firstBody->numColumns();
    int numRows = firstBody->numRows();

    // If there's only one cell, it's not a good AXTable candidate.
    if (numRows == 1 && numCols == 1)
        return false;

    // If there are at least 20 rows, we'll call it a data table.
    if (numRows >= 20)
        return true;

    // Store the background color of the table to check against cell's background colors.
    RenderStyle* tableStyle = table->style();
    if (!tableStyle)
        return false;
    Color tableBGColor = tableStyle->visitedDependentColor(CSSPropertyBackgroundColor);

    // check enough of the cells to find if the table matches our criteria
    // Criteria:
    //   1) must have at least one valid cell (and)
    //   2) at least half of cells have borders (or)
    //   3) at least half of cells have different bg colors than the table, and there is cell spacing
    unsigned validCellCount = 0;
    unsigned borderedCellCount = 0;
    unsigned backgroundDifferenceCellCount = 0;
    unsigned cellsWithTopBorder = 0;
    unsigned cellsWithBottomBorder = 0;
    unsigned cellsWithLeftBorder = 0;
    unsigned cellsWithRightBorder = 0;

    Color alternatingRowColors[5];
    int alternatingRowColorCount = 0;

    int headersInFirstColumnCount = 0;
    for (int row = 0; row < numRows; ++row) {

        int headersInFirstRowCount = 0;
        for (int col = 0; col < numCols; ++col) {
            RenderTableCell* cell = firstBody->primaryCellAt(row, col);
            if (!cell)
                continue;
            Node* cellNode = cell->node();
            if (!cellNode)
                continue;

            if (cell->width() < 1 || cell->height() < 1)
                continue;

            validCellCount++;

            bool isTHCell = cellNode->hasTagName(thTag);
            // If the first row is comprised of all <th> tags, assume it is a data table.
            if (!row && isTHCell)
//.........这里部分代码省略.........