rendertablesection.cpp

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            continue;
        const BorderValue& cb = current.cell->style()->borderBottom();
        // FIXME: Don't repeat for the same col group
        RenderTableCol* colGroup = table()->colElement(c);
        if (colGroup) {
            const BorderValue& gb = colGroup->style()->borderBottom();
            if (gb.style() == BHIDDEN || cb.style() == BHIDDEN)
                continue;
            else
                allHidden = false;
            if (gb.style() > BHIDDEN && gb.width > borderWidth)
                borderWidth = gb.width;
            if (cb.style() > BHIDDEN && cb.width > borderWidth)
                borderWidth = cb.width;
        } else {
            if (cb.style() == BHIDDEN)
                continue;
            else
                allHidden = false;
            if (cb.style() > BHIDDEN && cb.width > borderWidth)
                borderWidth = cb.width;
        }
    }
    if (allHidden)
        return -1;

    return (borderWidth + 1) / 2;
}

int RenderTableSection::calcOuterBorderLeft(bool rtl) const
{
    int totalCols = table()->numEffCols();
    if (!m_gridRows || !totalCols)
        return 0;

    unsigned borderWidth = 0;

    const BorderValue& sb = style()->borderLeft();
    if (sb.style() == BHIDDEN)
        return -1;
    if (sb.style() > BHIDDEN)
        borderWidth = sb.width;

    int leftmostColumn = rtl ? totalCols - 1 : 0;
    RenderTableCol* colGroup = table()->colElement(leftmostColumn);
    if (colGroup) {
        const BorderValue& gb = colGroup->style()->borderLeft();
        if (gb.style() == BHIDDEN)
            return -1;
        if (gb.style() > BHIDDEN && gb.width > borderWidth)
            borderWidth = gb.width;
    }

    bool allHidden = true;
    for (int r = 0; r < m_gridRows; r++) {
        const CellStruct& current = cellAt(r, leftmostColumn);
        if (!current.cell)
            continue;
        // FIXME: Don't repeat for the same cell
        const BorderValue& cb = current.cell->style()->borderLeft();
        const BorderValue& rb = current.cell->parent()->style()->borderLeft();
        if (cb.style() == BHIDDEN || rb.style() == BHIDDEN)
            continue;
        else
            allHidden = false;
        if (cb.style() > BHIDDEN && cb.width > borderWidth)
            borderWidth = cb.width;
        if (rb.style() > BHIDDEN && rb.width > borderWidth)
            borderWidth = rb.width;
    }
    if (allHidden)
        return -1;

    return borderWidth / 2;
}

int RenderTableSection::calcOuterBorderRight(bool rtl) const
{
    int totalCols = table()->numEffCols();
    if (!m_gridRows || !totalCols)
        return 0;

    unsigned borderWidth = 0;

    const BorderValue& sb = style()->borderRight();
    if (sb.style() == BHIDDEN)
        return -1;
    if (sb.style() > BHIDDEN)
        borderWidth = sb.width;

    int rightmostColumn = rtl ? 0 : totalCols - 1;
    RenderTableCol* colGroup = table()->colElement(rightmostColumn);
    if (colGroup) {
        const BorderValue& gb = colGroup->style()->borderRight();
        if (gb.style() == BHIDDEN)
            return -1;
        if (gb.style() > BHIDDEN && gb.width > borderWidth)
            borderWidth = gb.width;
    }

    bool allHidden = true;
    for (int r = 0; r < m_gridRows; r++) {
        const CellStruct& current = cellAt(r, rightmostColumn);
        if (!current.cell)
            continue;
        // FIXME: Don't repeat for the same cell
        const BorderValue& cb = current.cell->style()->borderRight();
        const BorderValue& rb = current.cell->parent()->style()->borderRight();
        if (cb.style() == BHIDDEN || rb.style() == BHIDDEN)
            continue;
        else
            allHidden = false;
        if (cb.style() > BHIDDEN && cb.width > borderWidth)
            borderWidth = cb.width;
        if (rb.style() > BHIDDEN && rb.width > borderWidth)
            borderWidth = rb.width;
    }
    if (allHidden)
        return -1;

    return (borderWidth + 1) / 2;
}

void RenderTableSection::recalcOuterBorder()
{
    bool rtl = table()->style()->direction() == RTL;
    m_outerBorderTop = calcOuterBorderTop();
    m_outerBorderBottom = calcOuterBorderBottom();
    m_outerBorderLeft = calcOuterBorderLeft(rtl);
    m_outerBorderRight = calcOuterBorderRight(rtl);
}

int RenderTableSection::firstLineBoxBaseline() const
{
    if (!m_gridRows)
        return -1;

    int firstLineBaseline = m_grid[0].baseline;
    if (firstLineBaseline)
        return firstLineBaseline + m_rowPos[0];

    firstLineBaseline = -1;
    Row* firstRow = m_grid[0].row;
    for (size_t i = 0; i < firstRow->size(); ++i) {
        RenderTableCell* cell = firstRow->at(i).cell;
        if (cell)
            firstLineBaseline = max(firstLineBaseline, cell->y() + cell->paddingTop() + cell->borderTop() + cell->contentHeight());
    }

    return firstLineBaseline;
}

void RenderTableSection::paint(PaintInfo& paintInfo, int tx, int ty)
{
    // put this back in when all layout tests can handle it
    // ASSERT(!needsLayout());
    // avoid crashing on bugs that cause us to paint with dirty layout
    if (needsLayout())
        return;
    
    unsigned totalRows = m_gridRows;
    unsigned totalCols = table()->columns().size();

    if (!totalRows || !totalCols)
        return;

    tx += x();
    ty += y();

    PaintPhase phase = paintInfo.phase;
    bool pushedClip = pushContentsClip(paintInfo, tx, ty);
    paintObject(paintInfo, tx, ty);
    if (pushedClip)
        popContentsClip(paintInfo, phase, tx, ty);
}

void RenderTableSection::paintObject(PaintInfo& paintInfo, int tx, int ty)
{
    // Check which rows and cols are visible and only paint these.
    // FIXME: Could use a binary search here.
    unsigned totalRows = m_gridRows;
    unsigned totalCols = table()->columns().size();

    PaintPhase paintPhase = paintInfo.phase;
    int x = paintInfo.rect.x();
    int y = paintInfo.rect.y();
    int w = paintInfo.rect.width();
    int h = paintInfo.rect.height();

    int os = 2 * maximalOutlineSize(paintPhase);
    unsigned startrow = 0;
    unsigned endrow = totalRows;
    
    // If some cell overflows, just paint all of them.
    if (!m_hasOverflowingCell) {
        for (; startrow < totalRows; startrow++) {
            if (ty + m_rowPos[startrow + 1] >= y - os)
                break;
        }
        if (startrow == totalRows && ty + m_rowPos[totalRows] + table()->outerBorderBottom() >= y - os)
            startrow--;

        for (; endrow > 0; endrow--) {
            if (ty + m_rowPos[endrow - 1] <= y + h + os)
                break;
        }
        if (!endrow && ty + m_rowPos[0] - table()->outerBorderTop() <= y + h + os)
            endrow++;
    }

    unsigned startcol = 0;
    unsigned endcol = totalCols;
    // FIXME: Implement RTL.
    if (!m_hasOverflowingCell && style()->direction() == LTR) {
        for (; startcol < totalCols; startcol++) {
            if (tx + table()->columnPositions()[startcol + 1] >= x - os)
                break;
        }
        if (startcol == totalCols && tx + table()->columnPositions()[totalCols] + table()->outerBorderRight() >= x - os)
            startcol--;

        for (; endcol > 0; endcol--) {
            if (tx + table()->columnPositions()[endcol - 1] <= x + w + os)
                break;
        }
        if (!endcol && tx + table()->columnPositions()[0] - table()->outerBorderLeft() <= y + w + os)
            endcol++;
    }

    if (startcol < endcol) {
        // draw the cells
        for (unsigned r = startrow; r < endrow; r++) {
            unsigned c = startcol;
            // since a cell can be -1 (indicating a colspan) we might have to search backwards to include it
            while (c && cellAt(r, c).inColSpan)
                c--;
            for (; c < endcol; c++) {
                CellStruct current = cellAt(r, c);
                RenderTableCell* cell = current.cell;
                    
                // Cells must always paint in the order in which they appear taking into account
                // their upper left originating row/column.  For cells with rowspans, avoid repainting
                // if we've already seen the cell.
                if (!cell || (r > startrow && (cellAt(r - 1, c).cell == cell)))
                    continue;

                RenderTableRow* row = static_cast<RenderTableRow*>(cell->parent());

                if (paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) {
                    // We need to handle painting a stack of backgrounds.  This stack (from bottom to top) consists of
                    // the column group, column, row group, row, and then the cell.
                    RenderObject* col = table()->colElement(c);
                    RenderObject* colGroup = 0;
                    if (col && col->parent()->style()->display() == TABLE_COLUMN_GROUP)
                        colGroup = col->parent();

                    // Column groups and columns first.
                    // FIXME: Columns and column groups do not currently support opacity, and they are being painted "too late" in
                    // the stack, since we have already opened a transparency layer (potentially) for the table row group.
                    // Note that we deliberately ignore whether or not the cell has a layer, since these backgrounds paint "behind" the
                    // cell.
                    cell->paintBackgroundsBehindCell(paintInfo, tx, ty, colGroup);
                    cell->paintBackgroundsBehindCell(paintInfo, tx, ty, col);

                    // Paint the row group next.
                    cell->paintBackgroundsBehindCell(paintInfo, tx, ty, this);

                    // Paint the row next, but only if it doesn't have a layer.  If a row has a layer, it will be responsible for
                    // painting the row background for the cell.
                    if (!row->hasSelfPaintingLayer())
                        cell->paintBackgroundsBehindCell(paintInfo, tx, ty, row);
                }

                if ((!cell->hasSelfPaintingLayer() && !row->hasSelfPaintingLayer()) || paintInfo.phase == PaintPhaseCollapsedTableBorders)
                    cell->paint(paintInfo, tx, ty);
            }
        }
    }
}

void RenderTableSection::imageChanged(WrappedImagePtr, const IntRect*)
{
    // FIXME: Examine cells and repaint only the rect the image paints in.
    repaint();
}

void RenderTableSection::recalcCells()
{
    m_cCol = 0;
    m_cRow = -1;
    clearGrid();
    m_gridRows = 0;

    for (RenderObject* row = firstChild(); row; row = row->nextSibling()) {
        if (row->isTableRow()) {
            m_cRow++;
            m_cCol = 0;
            if (!ensureRows(m_cRow + 1))
                break;
            
            RenderTableRow* tableRow = static_cast<RenderTableRow*>(row);
            m_grid[m_cRow].rowRenderer = tableRow;

            for (RenderObject* cell = row->firstChild(); cell; cell = cell->nextSibling()) {
                if (cell->isTableCell())
                    addCell(static_cast<RenderTableCell*>(cell), tableRow);
            }
        }
    }
    m_needsCellRecalc = false;
    setNeedsLayout(true);
}

void RenderTableSection::clearGrid()
{
    int rows = m_gridRows;
    while (rows--)
        delete m_grid[rows].row;
}

int RenderTableSection::numColumns() const
{
    int result = 0;
    
    for (int r = 0; r < m_gridRows; ++r) {
        for (int c = result; c < table()->numEffCols(); ++c) {
            const CellStruct& cell = cellAt(r, c);
            if (cell.cell || cell.inColSpan)
                result = c;
        }
    }
    
    return result + 1;
}

void RenderTableSection::appendColumn(int pos)
{
    for (int row = 0; row < m_gridRows; ++row) {
        m_grid[row].row->resize(pos + 1);
        CellStruct& c = cellAt(row, pos);
        c.cell = 0;
        c.inColSpan = false;
    }
}

void RenderTableSection::splitColumn(int pos, int newSize)
{
    if (m_cCol > pos)
        m_cCol++;
    for (int row = 0; row < m_gridRows; ++row) {
        m_grid[row].row->resize(newSize);
        Row& r = *m_grid[row].row;
        memmove(r.data() + pos + 1, r.data() + pos, (newSize - 1 - pos) * sizeof(CellStruct));
        r[pos + 1].cell = 0;
        r[pos + 1].inColSpan = r[pos].inColSpan || r[pos].cell;
    }
}

// Hit Testing
bool RenderTableSection::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int xPos, int yPos, int tx, int ty, HitTestAction action)
{
    // Table sections cannot ever be hit tested.  Effectively they do not exist.
    // Just forward to our children always.
    tx += x();
    ty += y();

    if (hasOverflowClip() && !overflowClipRect(tx, ty).contains(xPos, yPos))
        return false;

    for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
        // FIXME: We have to skip over inline flows, since they can show up inside table rows
        // at the moment (a demoted inline <form> for example). If we ever implement a
        // table-specific hit-test method (which we should do for performance reasons anyway),
        // then we can remove this check.
        if (child->isBox() && !toRenderBox(child)->hasSelfPaintingLayer() && child->nodeAtPoint(request, result, xPos, yPos, tx, ty, action)) {
            updateHitTestResult(result, IntPoint(xPos - tx, yPos - ty));
            return true;
        }
    }
    
    return false;
}

} // namespace WebCore