C++ RenderStyle::emptyCells方法代码示例

//.........这里部分代码省略.........
            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)
                headersInFirstRowCount++;

            // If the first column is comprised of all <th> tags, assume it is a data table.
            if (!col && isTHCell)
                headersInFirstColumnCount++;

            // in this case, the developer explicitly assigned a "data" table attribute
            if (cellNode->hasTagName(tdTag) || cellNode->hasTagName(thTag)) {
                HTMLTableCellElement* cellElement = toHTMLTableCellElement(cellNode);
                if (!cellElement->headers().isEmpty() || !cellElement->abbr().isEmpty()
                    || !cellElement->axis().isEmpty() || !cellElement->scope().isEmpty())
                    return true;
            }

            RenderStyle* renderStyle = cell->style();
            if (!renderStyle)
                continue;

            // If the empty-cells style is set, we'll call it a data table.
            if (renderStyle->emptyCells() == HIDE)
                return true;

            // If a cell has matching bordered sides, call it a (fully) bordered cell.
            if ((cell->borderTop() > 0 && cell->borderBottom() > 0)
                || (cell->borderLeft() > 0 && cell->borderRight() > 0))
                borderedCellCount++;

            // Also keep track of each individual border, so we can catch tables where most
            // cells have a bottom border, for example.
            if (cell->borderTop() > 0)
                cellsWithTopBorder++;
            if (cell->borderBottom() > 0)
                cellsWithBottomBorder++;
            if (cell->borderLeft() > 0)
                cellsWithLeftBorder++;
            if (cell->borderRight() > 0)
                cellsWithRightBorder++;

            // If the cell has a different color from the table and there is cell spacing,
            // then it is probably a data table cell (spacing and colors take the place of borders).
            Color cellColor = renderStyle->visitedDependentColor(CSSPropertyBackgroundColor);
            if (table->hBorderSpacing() > 0 && table->vBorderSpacing() > 0
                && tableBGColor != cellColor && cellColor.alpha() != 1)
                backgroundDifferenceCellCount++;

            // If we've found 10 "good" cells, we don't need to keep searching.
            if (borderedCellCount >= 10 || backgroundDifferenceCellCount >= 10)
                return true;

            // For the first 5 rows, cache the background color so we can check if this table has zebra-striped rows.
            if (row < 5 && row == alternatingRowColorCount) {
                RenderObject* renderRow = cell->parent();

//.........这里部分代码省略.........
                return new CSSPrimitiveValueImpl(CSS_VAL_COMPACT);
            case khtml::INLINE_BLOCK:
                return new CSSPrimitiveValueImpl(CSS_VAL_INLINE_BLOCK);
            case khtml::TABLE:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE);
            case khtml::INLINE_TABLE:
                return new CSSPrimitiveValueImpl(CSS_VAL_INLINE_TABLE);
            case khtml::TABLE_ROW_GROUP:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE_ROW_GROUP);
            case khtml::TABLE_HEADER_GROUP:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE_HEADER_GROUP);
            case khtml::TABLE_FOOTER_GROUP:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE_FOOTER_GROUP);
            case khtml::TABLE_ROW:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE_ROW);
            case khtml::TABLE_COLUMN_GROUP:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE_COLUMN_GROUP);
            case khtml::TABLE_COLUMN:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE_COLUMN);
            case khtml::TABLE_CELL:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE_CELL);
            case khtml::TABLE_CAPTION:
                return new CSSPrimitiveValueImpl(CSS_VAL_TABLE_CAPTION);
            case khtml::BOX:
                return new CSSPrimitiveValueImpl(CSS_VAL__KHTML_BOX);
            case khtml::INLINE_BOX:
                return new CSSPrimitiveValueImpl(CSS_VAL__KHTML_INLINE_BOX);
            case khtml::NONE:
                return new CSSPrimitiveValueImpl(CSS_VAL_NONE);
        }
        ASSERT_NOT_REACHED();
        return 0;
    case CSS_PROP_EMPTY_CELLS:
        switch (style->emptyCells()) {
            case khtml::SHOW:
                return new CSSPrimitiveValueImpl(CSS_VAL_SHOW);
            case khtml::HIDE:
                return new CSSPrimitiveValueImpl(CSS_VAL_HIDE);
        }
        ASSERT_NOT_REACHED();
        return 0;
    case CSS_PROP_FLOAT:
        switch (style->floating()) {
            case khtml::FNONE:
                return new CSSPrimitiveValueImpl(CSS_VAL_NONE);
            case khtml::FLEFT:
                return new CSSPrimitiveValueImpl(CSS_VAL_LEFT);
            case khtml::FRIGHT:
                return new CSSPrimitiveValueImpl(CSS_VAL_RIGHT);
        }
        ASSERT_NOT_REACHED();
        return 0;
    case CSS_PROP_FONT_FAMILY:
    {
        FontDef def = style->htmlFont().getFontDef();
        return new CSSPrimitiveValueImpl(def.firstFamily().family().domString(), CSSPrimitiveValue::CSS_STRING);
    }
    case CSS_PROP_FONT_SIZE:
    {
        FontDef def = style->htmlFont().getFontDef();
        return new CSSPrimitiveValueImpl(def.specifiedSize, CSSPrimitiveValue::CSS_PX);
    }
    case CSS_PROP_FONT_STRETCH:
        // FIXME: unimplemented
        break;
    case CSS_PROP_FONT_STYLE: