rendertable.cpp

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        m_overflowWidth = max(m_overflowWidth, m_caption->x() + m_caption->overflowWidth(false));
    }

    if (isPositioned())
        calcHeight();

    m_overflowHeight = max(m_overflowHeight, height());

    // table can be containing block of positioned elements.
    // FIXME: Only pass true if width or height changed.
    layoutPositionedObjects(true);

    if (!hasOverflowClip()) {
        for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) {
            m_overflowLeft = min(m_overflowLeft, boxShadow->x - boxShadow->blur);
            m_overflowWidth = max(m_overflowWidth, width() + boxShadow->x + boxShadow->blur);
            m_overflowTop = min(m_overflowTop, boxShadow->y - boxShadow->blur);
            m_overflowHeight = max(m_overflowHeight, height() + boxShadow->y + boxShadow->blur);
        }
        
        if (hasReflection()) {
            IntRect reflection(reflectionBox());
            m_overflowTop = min(m_overflowTop, reflection.y());
            m_overflowHeight = max(m_overflowHeight, reflection.bottom());
            m_overflowLeft = min(m_overflowLeft, reflection.x());
            m_overflowHeight = max(m_overflowWidth, reflection.right());
        }
    }

    statePusher.pop();

    bool didFullRepaint = repainter.repaintAfterLayout();
    // Repaint with our new bounds if they are different from our old bounds.
    if (!didFullRepaint && sectionMoved)
        repaintRectangle(IntRect(m_overflowLeft, movedSectionTop, m_overflowWidth - m_overflowLeft, m_overflowHeight - movedSectionTop));
    
    setNeedsLayout(false);
}

void RenderTable::setCellWidths()
{
    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (child->isTableSection())
            static_cast<RenderTableSection*>(child)->setCellWidths();
    }
}

void RenderTable::paint(PaintInfo& paintInfo, int tx, int ty)
{
    tx += x();
    ty += y();

    PaintPhase paintPhase = paintInfo.phase;

    int os = 2 * maximalOutlineSize(paintPhase);
    if (ty + overflowTop(false) >= paintInfo.rect.bottom() + os || ty + overflowHeight(false) <= paintInfo.rect.y() - os)
        return;
    if (tx + overflowLeft(false) >= paintInfo.rect.right() + os || tx + overflowWidth(false) <= paintInfo.rect.x() - os)
        return;

    bool pushedClip = pushContentsClip(paintInfo, tx, ty);    
    paintObject(paintInfo, tx, ty);
    if (pushedClip)
        popContentsClip(paintInfo, paintPhase, tx, ty);
}

void RenderTable::paintObject(PaintInfo& paintInfo, int tx, int ty)
{
    PaintPhase paintPhase = paintInfo.phase;
    if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) && hasBoxDecorations() && style()->visibility() == VISIBLE)
        paintBoxDecorations(paintInfo, tx, ty);

    if (paintPhase == PaintPhaseMask) {
        paintMask(paintInfo, tx, ty);
        return;
    }

    // We're done.  We don't bother painting any children.
    if (paintPhase == PaintPhaseBlockBackground)
        return;
    
    // We don't paint our own background, but we do let the kids paint their backgrounds.
    if (paintPhase == PaintPhaseChildBlockBackgrounds)
        paintPhase = PaintPhaseChildBlockBackground;

    PaintInfo info(paintInfo);
    info.phase = paintPhase;
    info.paintingRoot = paintingRootForChildren(paintInfo);

    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (child->isBox() && !toRenderBox(child)->hasSelfPaintingLayer() && (child->isTableSection() || child == m_caption))
            child->paint(info, tx, ty);
    }
    
    if (collapseBorders() && paintPhase == PaintPhaseChildBlockBackground && style()->visibility() == VISIBLE) {
        // Collect all the unique border styles that we want to paint in a sorted list.  Once we
        // have all the styles sorted, we then do individual passes, painting each style of border
        // from lowest precedence to highest precedence.
        info.phase = PaintPhaseCollapsedTableBorders;
        RenderTableCell::CollapsedBorderStyles borderStyles;
        RenderObject* stop = nextInPreOrderAfterChildren();
        for (RenderObject* o = firstChild(); o && o != stop; o = o->nextInPreOrder())
            if (o->isTableCell())
                static_cast<RenderTableCell*>(o)->collectBorderStyles(borderStyles);
        RenderTableCell::sortBorderStyles(borderStyles);
        size_t count = borderStyles.size();
        for (size_t i = 0; i < count; ++i) {
            m_currentBorder = &borderStyles[i];
            for (RenderObject* child = firstChild(); child; child = child->nextSibling())
                if (child->isTableSection())
                    child->paint(info, tx, ty);
        }
        m_currentBorder = 0;
    }
}

void RenderTable::paintBoxDecorations(PaintInfo& paintInfo, int tx, int ty)
{
    int w = width();
    int h = height();

    // Account for the caption.
    if (m_caption) {
        int captionHeight = (m_caption->height() + m_caption->marginBottom() +  m_caption->marginTop());
        h -= captionHeight;
        if (m_caption->style()->captionSide() != CAPBOTTOM)
            ty += captionHeight;
    }

    int my = max(ty, paintInfo.rect.y());
    int mh;
    if (ty < paintInfo.rect.y())
        mh = max(0, h - (paintInfo.rect.y() - ty));
    else
        mh = min(paintInfo.rect.height(), h);

    paintBoxShadow(paintInfo.context, tx, ty, w, h, style());
    
    paintFillLayers(paintInfo, style()->backgroundColor(), style()->backgroundLayers(), my, mh, tx, ty, w, h);

    if (style()->hasBorder() && !collapseBorders())
        paintBorder(paintInfo.context, tx, ty, w, h, style());
}

void RenderTable::paintMask(PaintInfo& paintInfo, int tx, int ty)
{
    if (style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
        return;

    int w = width();
    int h = height();

    // Account for the caption.
    if (m_caption) {
        int captionHeight = (m_caption->height() + m_caption->marginBottom() +  m_caption->marginTop());
        h -= captionHeight;
        if (m_caption->style()->captionSide() != CAPBOTTOM)
            ty += captionHeight;
    }

    int my = max(ty, paintInfo.rect.y());
    int mh;
    if (ty < paintInfo.rect.y())
        mh = max(0, h - (paintInfo.rect.y() - ty));
    else
        mh = min(paintInfo.rect.height(), h);
    
    paintMaskImages(paintInfo, my, mh, tx, ty, w, h);
}

void RenderTable::calcPrefWidths()
{
    ASSERT(prefWidthsDirty());

    recalcSectionsIfNeeded();
    recalcHorizontalBorders();

    m_tableLayout->calcPrefWidths(m_minPrefWidth, m_maxPrefWidth);

    if (m_caption)
        m_minPrefWidth = max(m_minPrefWidth, m_caption->minPrefWidth());

    setPrefWidthsDirty(false);
}

void RenderTable::splitColumn(int pos, int firstSpan)
{
    // we need to add a new columnStruct
    int oldSize = m_columns.size();
    m_columns.grow(oldSize + 1);
    int oldSpan = m_columns[pos].span;
    ASSERT(oldSpan > firstSpan);
    m_columns[pos].span = firstSpan;
    memmove(m_columns.data() + pos + 1, m_columns.data() + pos, (oldSize - pos) * sizeof(ColumnStruct));
    m_columns[pos + 1].span = oldSpan - firstSpan;

    // change width of all rows.
    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (child->isTableSection())
            static_cast<RenderTableSection*>(child)->splitColumn(pos, oldSize + 1);
    }

    m_columnPos.grow(numEffCols() + 1);
    setNeedsLayoutAndPrefWidthsRecalc();
}

void RenderTable::appendColumn(int span)
{
    // easy case.
    int pos = m_columns.size();
    int newSize = pos + 1;
    m_columns.grow(newSize);
    m_columns[pos].span = span;

    // change width of all rows.
    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (child->isTableSection())
            static_cast<RenderTableSection*>(child)->appendColumn(pos);
    }

    m_columnPos.grow(numEffCols() + 1);
    setNeedsLayoutAndPrefWidthsRecalc();
}

RenderTableCol* RenderTable::colElement(int col, bool* startEdge, bool* endEdge) const
{
    if (!m_hasColElements)
        return 0;
    RenderObject* child = firstChild();
    int cCol = 0;

    while (child) {
        if (child->isTableCol()) {
            RenderTableCol* colElem = static_cast<RenderTableCol*>(child);
            int span = colElem->span();
            if (!colElem->firstChild()) {
                int startCol = cCol;
                int endCol = cCol + span - 1;
                cCol += span;
                if (cCol > col) {
                    if (startEdge)
                        *startEdge = startCol == col;
                    if (endEdge)
                        *endEdge = endCol == col;
                    return colElem;
                }
            }

            RenderObject* next = child->firstChild();
            if (!next)
                next = child->nextSibling();
            if (!next && child->parent()->isTableCol())
                next = child->parent()->nextSibling();
            child = next;
        } else if (child == m_caption)
            child = child->nextSibling();
        else
            break;
    }

    return 0;
}

void RenderTable::recalcSections() const
{
    m_caption = 0;
    m_head = 0;
    m_foot = 0;
    m_firstBody = 0;
    m_hasColElements = false;

    // We need to get valid pointers to caption, head, foot and first body again
    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        switch (child->style()->display()) {
            case TABLE_CAPTION:
                if (!m_caption && child->isRenderBlock()) {
                    m_caption = toRenderBlock(child);
                    m_caption->setNeedsLayout(true);
                }
                break;
            case TABLE_COLUMN:
            case TABLE_COLUMN_GROUP:
                m_hasColElements = true;
                break;
            case TABLE_HEADER_GROUP:
                if (child->isTableSection()) {
                    RenderTableSection* section = static_cast<RenderTableSection*>(child);
                    if (!m_head)
                        m_head = section;
                    else if (!m_firstBody)
                        m_firstBody = section;
                    section->recalcCellsIfNeeded();
                }
                break;
            case TABLE_FOOTER_GROUP:
                if (child->isTableSection()) {
                    RenderTableSection* section = static_cast<RenderTableSection*>(child);
                    if (!m_foot)
                        m_foot = section;
                    else if (!m_firstBody)
                        m_firstBody = section;
                    section->recalcCellsIfNeeded();
                }
                break;
            case TABLE_ROW_GROUP:
                if (child->isTableSection()) {
                    RenderTableSection* section = static_cast<RenderTableSection*>(child);
                    if (!m_firstBody)
                        m_firstBody = section;
                    section->recalcCellsIfNeeded();
                }
                break;
            default:
                break;
        }
    }

    // repair column count (addChild can grow it too much, because it always adds elements to the last row of a section)
    int maxCols = 0;
    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (child->isTableSection()) {
            RenderTableSection* section = static_cast<RenderTableSection*>(child);
            int sectionCols = section->numColumns();
            if (sectionCols > maxCols)
                maxCols = sectionCols;
        }
    }
    
    m_columns.resize(maxCols);
    m_columnPos.resize(maxCols + 1);

    ASSERT(selfNeedsLayout());

    m_needsSectionRecalc = false;
}

int RenderTable::calcBorderLeft() const
{
    if (collapseBorders()) {
        // Determined by the first 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()->borderLeft();
        if (tb.style() == BHIDDEN)
            return 0;
        if (tb.style() > BHIDDEN)
            borderWidth = tb.width;

        int leftmostColumn = style()->direction() == RTL ? numEffCols() - 1 : 0;
        RenderTableCol* colGroup = colElement(leftmostColumn);
        if (colGroup) {
            const BorderValue& gb = style()->borderLeft();
            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()->borderLeft();
            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, leftmostColumn);
            
            if (cs.cell) {
                const BorderValue& cb = cs.cell->style()->borderLeft();
                if (cb.style() == BHIDDEN)
                    return 0;

                const BorderValue& rb = cs.cell->parent()->style()->borderLeft();
                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 / 2;
    }