rendertable.cpp

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    return RenderBlock::borderLeft();
}
    
int RenderTable::calcBorderRight() const
{
    if (collapseBorders()) {
        // Determined by the last cell of the first row. See the CSS 2.1 spec, section 17.6.2.
        if (!numEffCols())
            return 0;

        unsigned borderWidth = 0;

        const BorderValue& tb = style()->borderRight();
        if (tb.style() == BHIDDEN)
            return 0;
        if (tb.style() > BHIDDEN)
            borderWidth = tb.width;

        int rightmostColumn = style()->direction() == RTL ? 0 : numEffCols() - 1;
        RenderTableCol* colGroup = colElement(rightmostColumn);
        if (colGroup) {
            const BorderValue& gb = style()->borderRight();
            if (gb.style() == BHIDDEN)
                return 0;
            if (gb.style() > BHIDDEN)
                borderWidth = max(borderWidth, static_cast<unsigned>(gb.width));
        }
        
        RenderTableSection* firstNonEmptySection = m_head ? m_head : (m_firstBody ? m_firstBody : m_foot);
        if (firstNonEmptySection && !firstNonEmptySection->numRows())
            firstNonEmptySection = sectionBelow(firstNonEmptySection, true);
        
        if (firstNonEmptySection) {
            const BorderValue& sb = firstNonEmptySection->style()->borderRight();
            if (sb.style() == BHIDDEN)
                return 0;

            if (sb.style() > BHIDDEN)
                borderWidth = max(borderWidth, static_cast<unsigned>(sb.width));

            const RenderTableSection::CellStruct& cs = firstNonEmptySection->cellAt(0, rightmostColumn);
            
            if (cs.cell) {
                const BorderValue& cb = cs.cell->style()->borderRight();
                if (cb.style() == BHIDDEN)
                    return 0;

                const BorderValue& rb = cs.cell->parent()->style()->borderRight();
                if (rb.style() == BHIDDEN)
                    return 0;

                if (cb.style() > BHIDDEN)
                    borderWidth = max(borderWidth, static_cast<unsigned>(cb.width));
                if (rb.style() > BHIDDEN)
                    borderWidth = max(borderWidth, static_cast<unsigned>(rb.width));
            }
        }
        return (borderWidth + 1) / 2;
    }
    return RenderBlock::borderRight();
}

void RenderTable::recalcHorizontalBorders()
{
    m_borderLeft = calcBorderLeft();
    m_borderRight = calcBorderRight();
}

int RenderTable::borderTop() const
{
    if (collapseBorders())
        return outerBorderTop();
    return RenderBlock::borderTop();
}

int RenderTable::borderBottom() const
{
    if (collapseBorders())
        return outerBorderBottom();
    return RenderBlock::borderBottom();
}

int RenderTable::outerBorderTop() const
{
    if (!collapseBorders())
        return 0;
    int borderWidth = 0;
    RenderTableSection* topSection;
    if (m_head)
        topSection = m_head;
    else if (m_firstBody)
        topSection = m_firstBody;
    else if (m_foot)
        topSection = m_foot;
    else
        topSection = 0;
    if (topSection) {
        borderWidth = topSection->outerBorderTop();
        if (borderWidth == -1)
            return 0;   // Overridden by hidden
    }
    const BorderValue& tb = style()->borderTop();
    if (tb.style() == BHIDDEN)
        return 0;
    if (tb.style() > BHIDDEN)
        borderWidth = max(borderWidth, static_cast<int>(tb.width / 2));
    return borderWidth;
}

int RenderTable::outerBorderBottom() const
{
    if (!collapseBorders())
        return 0;
    int borderWidth = 0;
    RenderTableSection* bottomSection;
    if (m_foot)
        bottomSection = m_foot;
    else {
        RenderObject* child;
        for (child = lastChild(); child && !child->isTableSection(); child = child->previousSibling())
            ;
        bottomSection = child ? static_cast<RenderTableSection*>(child) : 0;
    }
    if (bottomSection) {
        borderWidth = bottomSection->outerBorderBottom();
        if (borderWidth == -1)
            return 0;   // Overridden by hidden
    }
    const BorderValue& tb = style()->borderBottom();
    if (tb.style() == BHIDDEN)
        return 0;
    if (tb.style() > BHIDDEN)
        borderWidth = max(borderWidth, static_cast<int>((tb.width + 1) / 2));
    return borderWidth;
}

int RenderTable::outerBorderLeft() const
{
    if (!collapseBorders())
        return 0;

    int borderWidth = 0;

    const BorderValue& tb = style()->borderLeft();
    if (tb.style() == BHIDDEN)
        return 0;
    if (tb.style() > BHIDDEN)
        borderWidth = tb.width / 2;

    bool allHidden = true;
    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (!child->isTableSection())
            continue;
        int sw = static_cast<RenderTableSection*>(child)->outerBorderLeft();
        if (sw == -1)
            continue;
        else
            allHidden = false;
        borderWidth = max(borderWidth, sw);
    }
    if (allHidden)
        return 0;

    return borderWidth;
}

int RenderTable::outerBorderRight() const
{
    if (!collapseBorders())
        return 0;

    int borderWidth = 0;

    const BorderValue& tb = style()->borderRight();
    if (tb.style() == BHIDDEN)
        return 0;
    if (tb.style() > BHIDDEN)
        borderWidth = (tb.width + 1) / 2;

    bool allHidden = true;
    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (!child->isTableSection())
            continue;
        int sw = static_cast<RenderTableSection*>(child)->outerBorderRight();
        if (sw == -1)
            continue;
        else
            allHidden = false;
        borderWidth = max(borderWidth, sw);
    }
    if (allHidden)
        return 0;

    return borderWidth;
}

RenderTableSection* RenderTable::sectionAbove(const RenderTableSection* section, bool skipEmptySections) const
{
    recalcSectionsIfNeeded();

    if (section == m_head)
        return 0;

    RenderObject* prevSection = section == m_foot ? lastChild() : section->previousSibling();
    while (prevSection) {
        if (prevSection->isTableSection() && prevSection != m_head && prevSection != m_foot && (!skipEmptySections || static_cast<RenderTableSection*>(prevSection)->numRows()))
            break;
        prevSection = prevSection->previousSibling();
    }
    if (!prevSection && m_head && (!skipEmptySections || m_head->numRows()))
        prevSection = m_head;
    return static_cast<RenderTableSection*>(prevSection);
}

RenderTableSection* RenderTable::sectionBelow(const RenderTableSection* section, bool skipEmptySections) const
{
    recalcSectionsIfNeeded();

    if (section == m_foot)
        return 0;

    RenderObject* nextSection = section == m_head ? firstChild() : section->nextSibling();
    while (nextSection) {
        if (nextSection->isTableSection() && nextSection != m_head && nextSection != m_foot && (!skipEmptySections || static_cast<RenderTableSection*>(nextSection)->numRows()))
            break;
        nextSection = nextSection->nextSibling();
    }
    if (!nextSection && m_foot && (!skipEmptySections || m_foot->numRows()))
        nextSection = m_foot;
    return static_cast<RenderTableSection*>(nextSection);
}

RenderTableCell* RenderTable::cellAbove(const RenderTableCell* cell) const
{
    recalcSectionsIfNeeded();

    // Find the section and row to look in
    int r = cell->row();
    RenderTableSection* section = 0;
    int rAbove = 0;
    if (r > 0) {
        // cell is not in the first row, so use the above row in its own section
        section = cell->section();
        rAbove = r - 1;
    } else {
        section = sectionAbove(cell->section(), true);
        if (section)
            rAbove = section->numRows() - 1;
    }

    // Look up the cell in the section's grid, which requires effective col index
    if (section) {
        int effCol = colToEffCol(cell->col());
        RenderTableSection::CellStruct aboveCell;
        // If we hit a span back up to a real cell.
        do {
            aboveCell = section->cellAt(rAbove, effCol);
            effCol--;
        } while (!aboveCell.cell && aboveCell.inColSpan && effCol >= 0);
        return aboveCell.cell;
    } else
        return 0;
}

RenderTableCell* RenderTable::cellBelow(const RenderTableCell* cell) const
{
    recalcSectionsIfNeeded();

    // Find the section and row to look in
    int r = cell->row() + cell->rowSpan() - 1;
    RenderTableSection* section = 0;
    int rBelow = 0;
    if (r < cell->section()->numRows() - 1) {
        // The cell is not in the last row, so use the next row in the section.
        section = cell->section();
        rBelow = r + 1;
    } else {
        section = sectionBelow(cell->section(), true);
        if (section)
            rBelow = 0;
    }

    // Look up the cell in the section's grid, which requires effective col index
    if (section) {
        int effCol = colToEffCol(cell->col());
        RenderTableSection::CellStruct belowCell;
        // If we hit a colspan back up to a real cell.
        do {
            belowCell = section->cellAt(rBelow, effCol);
            effCol--;
        } while (!belowCell.cell && belowCell.inColSpan && effCol >= 0);
        return belowCell.cell;
    } else
        return 0;
}

RenderTableCell* RenderTable::cellBefore(const RenderTableCell* cell) const
{
    recalcSectionsIfNeeded();

    RenderTableSection* section = cell->section();
    int effCol = colToEffCol(cell->col());
    if (!effCol)
        return 0;
    
    // If we hit a colspan back up to a real cell.
    RenderTableSection::CellStruct prevCell;
    do {
        prevCell = section->cellAt(cell->row(), effCol - 1);
        effCol--;
    } while (!prevCell.cell && prevCell.inColSpan && effCol >= 0);
    return prevCell.cell;
}

RenderTableCell* RenderTable::cellAfter(const RenderTableCell* cell) const
{
    recalcSectionsIfNeeded();

    int effCol = colToEffCol(cell->col() + cell->colSpan());
    if (effCol >= numEffCols())
        return 0;
    return cell->section()->cellAt(cell->row(), effCol).cell;
}

RenderBlock* RenderTable::firstLineBlock() const
{
    return 0;
}

void RenderTable::updateFirstLetter()
{
}

int RenderTable::firstLineBoxBaseline() const
{
    RenderTableSection* firstNonEmptySection = m_head ? m_head : (m_firstBody ? m_firstBody : m_foot);
    if (firstNonEmptySection && !firstNonEmptySection->numRows())
        firstNonEmptySection = sectionBelow(firstNonEmptySection, true);

    if (!firstNonEmptySection)
        return -1;

    return firstNonEmptySection->y() + firstNonEmptySection->firstLineBoxBaseline();
}

IntRect RenderTable::overflowClipRect(int tx, int ty)
{
    IntRect rect = RenderBlock::overflowClipRect(tx, ty);
    
    // If we have a caption, expand the clip to include the caption.
    // FIXME: Technically this is wrong, but it's virtually impossible to fix this
    // for real until captions have been re-written.
    // FIXME: This code assumes (like all our other caption code) that only top/bottom are
    // supported.  When we actually support left/right and stop mapping them to top/bottom,
    // we might have to hack this code first (depending on what order we do these bug fixes in).
    if (m_caption) {
        rect.setHeight(height());
        rect.setY(ty);
    }

    return rect;
}

bool RenderTable::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int xPos, int yPos, int tx, int ty, HitTestAction action)
{
    tx += x();
    ty += y();

    // Check kids first.
    if (!hasOverflowClip() || overflowClipRect(tx, ty).contains(xPos, yPos)) {
        for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
            if (child->isBox() && !toRenderBox(child)->hasSelfPaintingLayer() && (child->isTableSection() || child == m_caption) &&
                child->nodeAtPoint(request, result, xPos, yPos, tx, ty, action)) {
                updateHitTestResult(result, IntPoint(xPos - tx, yPos - ty));
                return true;
            }
        }
    }

    // Check our bounds next.
    if (visibleToHitTesting() && (action == HitTestBlockBackground || action == HitTestChildBlockBackground) && IntRect(tx, ty, width(), height()).contains(xPos, yPos)) {
        updateHitTestResult(result, IntPoint(xPos - tx, yPos - ty));
        return true;
    }

    return false;
}

}