rendertablesection.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 1997 Martin Jones ([e-mail])
 *           (C) 1997 Torben Weis ([e-mail])
 *           (C) 1998 Waldo Bastian ([e-mail])
 *           (C) 1999 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2006 Alexey Proskuryakov ([e-mail])
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "RenderTableSection.h"

#include "CachedImage.h"
#include "Document.h"
#include "HTMLNames.h"
#include "RenderTableCell.h"
#include "RenderTableCol.h"
#include "RenderTableRow.h"
#include "RenderView.h"
#include <limits>
#include <wtf/Vector.h>

using namespace std;

namespace WebCore {

using namespace HTMLNames;

RenderTableSection::RenderTableSection(Node* node)
    : RenderBox(node)
    , m_gridRows(0)
    , m_cCol(0)
    , m_cRow(-1)
    , m_needsCellRecalc(false)
    , m_outerBorderLeft(0)
    , m_outerBorderRight(0)
    , m_outerBorderTop(0)
    , m_outerBorderBottom(0)
    , m_overflowLeft(0)
    , m_overflowWidth(0)
    , m_overflowTop(0)
    , m_overflowHeight(0)
    , m_hasOverflowingCell(false)
{
    // init RenderObject attributes
    setInline(false);   // our object is not Inline
}

RenderTableSection::~RenderTableSection()
{
    clearGrid();
}

void RenderTableSection::destroy()
{
    RenderTable* recalcTable = table();
    
    RenderBox::destroy();
    
    // recalc cell info because RenderTable has unguarded pointers
    // stored that point to this RenderTableSection.
    if (recalcTable)
        recalcTable->setNeedsSectionRecalc();
}

void RenderTableSection::addChild(RenderObject* child, RenderObject* beforeChild)
{
    // Make sure we don't append things after :after-generated content if we have it.
    if (!beforeChild && isAfterContent(lastChild()))
        beforeChild = lastChild();

    bool isTableSection = node() && (node()->hasTagName(theadTag) || node()->hasTagName(tbodyTag) || node()->hasTagName(tfootTag));

    if (!child->isTableRow()) {
        if (isTableSection && child->node() && child->node()->hasTagName(formTag) && document()->isHTMLDocument()) {
            RenderBox::addChild(child, beforeChild);
            return;
        }

        RenderObject* last = beforeChild;
        if (!last)
            last = lastChild();
        if (last && last->isAnonymous()) {
            last->addChild(child);
            return;
        }

        // If beforeChild is inside an anonymous cell/row, insert into the cell or into
        // the anonymous row containing it, if there is one.
        RenderObject* lastBox = last;
        while (lastBox && lastBox->parent()->isAnonymous() && !lastBox->isTableRow())
            lastBox = lastBox->parent();
        if (lastBox && lastBox->isAnonymous()) {
            lastBox->addChild(child, beforeChild);
            return;
        }

        RenderObject* row = new (renderArena()) RenderTableRow(document() /* anonymous table */);
        RefPtr<RenderStyle> newStyle = RenderStyle::create();
        newStyle->inheritFrom(style());
        newStyle->setDisplay(TABLE_ROW);
        row->setStyle(newStyle.release());
        addChild(row, beforeChild);
        row->addChild(child);
        return;
    }

    if (beforeChild)
        setNeedsCellRecalc();

    ++m_cRow;
    m_cCol = 0;

    // make sure we have enough rows
    if (!ensureRows(m_cRow + 1))
        return;

    m_grid[m_cRow].rowRenderer = static_cast<RenderTableRow*>(child);

    if (!beforeChild) {
        m_grid[m_cRow].height = child->style()->height();
        if (m_grid[m_cRow].height.isRelative())
            m_grid[m_cRow].height = Length();
    }

    // If the next renderer is actually wrapped in an anonymous table row, we need to go up and find that.
    while (beforeChild && beforeChild->parent() != this)
        beforeChild = beforeChild->parent();

    ASSERT(!beforeChild || beforeChild->isTableRow() || isTableSection && beforeChild->node() && beforeChild->node()->hasTagName(formTag) && document()->isHTMLDocument());
    RenderBox::addChild(child, beforeChild);
}

void RenderTableSection::removeChild(RenderObject* oldChild)
{
    setNeedsCellRecalc();
    RenderBox::removeChild(oldChild);
}

bool RenderTableSection::ensureRows(int numRows)
{
    int nRows = m_gridRows;
    if (numRows > nRows) {
        if (numRows > static_cast<int>(m_grid.size())) {
            size_t maxSize = numeric_limits<size_t>::max() / sizeof(RowStruct);
            if (static_cast<size_t>(numRows) > maxSize)
                return false;
            m_grid.grow(numRows);
        }
        m_gridRows = numRows;
        int nCols = max(1, table()->numEffCols());
        CellStruct emptyCellStruct;
        emptyCellStruct.cell = 0;
        emptyCellStruct.inColSpan = false;
        for (int r = nRows; r < numRows; r++) {
            m_grid[r].row = new Row(nCols);
            m_grid[r].row->fill(emptyCellStruct);
            m_grid[r].rowRenderer = 0;
            m_grid[r].baseline = 0;
            m_grid[r].height = Length();
        }
    }

    return true;
}

void RenderTableSection::addCell(RenderTableCell* cell, RenderTableRow* row)
{
    int rSpan = cell->rowSpan();
    int cSpan = cell->colSpan();
    Vector<RenderTable::ColumnStruct>& columns = table()->columns();
    int nCols = columns.size();

    // ### mozilla still seems to do the old HTML way, even for strict DTD
    // (see the annotation on table cell layouting in the CSS specs and the testcase below:
    // <TABLE border>
    // <TR><TD>1 <TD rowspan="2">2 <TD>3 <TD>4
    // <TR><TD colspan="2">5
    // </TABLE>

    while (m_cCol < nCols && (cellAt(m_cRow, m_cCol).cell || cellAt(m_cRow, m_cCol).inColSpan))
        m_cCol++;

    if (rSpan == 1) {
        // we ignore height settings on rowspan cells
        Length height = cell->style()->height();
        if (height.isPositive() || (height.isRelative() && height.value() >= 0)) {
            Length cRowHeight = m_grid[m_cRow].height;
            switch (height.type()) {
                case Percent:
                    if (!(cRowHeight.isPercent()) ||
                        (cRowHeight.isPercent() && cRowHeight.rawValue() < height.rawValue()))
                        m_grid[m_cRow].height = height;
                        break;
                case Fixed:
                    if (cRowHeight.type() < Percent ||
                        (cRowHeight.isFixed() && cRowHeight.value() < height.value()))
                        m_grid[m_cRow].height = height;
                    break;
                case Relative:
                default:
                    break;
            }
        }
    }

    // make sure we have enough rows
    if (!ensureRows(m_cRow + rSpan))
        return;

    m_grid[m_cRow].rowRenderer = row;

    int col = m_cCol;
    // tell the cell where it is
    CellStruct currentCell;
    currentCell.cell = cell;
    currentCell.inColSpan = false;
    while (cSpan) {
        int currentSpan;
        if (m_cCol >= nCols) {
            table()->appendColumn(cSpan);
            currentSpan = cSpan;
        } else {
            if (cSpan < columns[m_cCol].span)
                table()->splitColumn(m_cCol, cSpan);
            currentSpan = columns[m_cCol].span;
        }

        for (int r = 0; r < rSpan; r++) {
            CellStruct& c = cellAt(m_cRow + r, m_cCol);
            if (currentCell.cell && !c.cell)
                c.cell = currentCell.cell;
            if (currentCell.inColSpan)
                c.inColSpan = true;
        }
        m_cCol++;
        cSpan -= currentSpan;
        currentCell.cell = 0;
        currentCell.inColSpan = true;
    }
    if (cell) {
        cell->setRow(m_cRow);
        cell->setCol(table()->effColToCol(col));
    }
}

void RenderTableSection::setCellWidths()
{
    Vector<int>& columnPos = table()->columnPositions();

    LayoutStateMaintainer statePusher(view());
    
    for (int i = 0; i < m_gridRows; i++) {
        Row& row = *m_grid[i].row;
        int cols = row.size();
        for (int j = 0; j < cols; j++) {
            CellStruct current = row[j];
            RenderTableCell* cell = current.cell;

            if (!cell)
                continue;
            int endCol = j;
            int cspan = cell->colSpan();
            while (cspan && endCol < cols) {
                cspan -= table()->columns()[endCol].span;
                endCol++;
            }
            int w = columnPos[endCol] - columnPos[j] - table()->hBorderSpacing();
            int oldWidth = cell->width();
            if (w != oldWidth) {
                cell->setNeedsLayout(true);
                if (!table()->selfNeedsLayout() && cell->checkForRepaintDuringLayout()) {
                    if (!statePusher.didPush()) {
                        // Technically, we should also push state for the row, but since
                        // rows don't push a coordinate transform, that's not necessary.
                        statePusher.push(this, IntSize(x(), y()));
                    }
                    cell->repaint();
                }
                cell->updateWidth(w);
            }
        }
    }
    
    statePusher.pop();  // only pops if we pushed
}

int RenderTableSection::calcRowHeight()
{
#ifndef NDEBUG
    setNeedsLayoutIsForbidden(true);
#endif

    ASSERT(!needsLayout());

    RenderTableCell* cell;

    int spacing = table()->vBorderSpacing();

    LayoutStateMaintainer statePusher(view());

    m_rowPos.resize(m_gridRows + 1);
    m_rowPos[0] = spacing;

    for (int r = 0; r < m_gridRows; r++) {
        m_rowPos[r + 1] = 0;
        m_grid[r].baseline = 0;
        int baseline = 0;
        int bdesc = 0;
        int ch = m_grid[r].height.calcMinValue(0);
        int pos = m_rowPos[r] + ch + (m_grid[r].rowRenderer ? spacing : 0);

        m_rowPos[r + 1] = max(m_rowPos[r + 1], pos);

        Row* row = m_grid[r].row;
        int totalCols = row->size();

        for (int c = 0; c < totalCols; c++) {
            CellStruct current = cellAt(r, c);
            cell = current.cell;
            if (!cell || current.inColSpan)
                continue;
            if (r < m_gridRows - 1 && cellAt(r + 1, c).cell == cell)
                continue;

            int indx = max(r - cell->rowSpan() + 1, 0);

            if (cell->overrideSize() != -1) {
                if (!statePusher.didPush()) {
                    // Technically, we should also push state for the row, but since
                    // rows don't push a coordinate transform, that's not necessary.
                    statePusher.push(this, IntSize(x(), y()));
                }
                cell->setOverrideSize(-1);
                cell->setChildNeedsLayout(true, false);
                cell->layoutIfNeeded();
            }
            
            int adjustedPaddingTop = cell->paddingTop() - cell->intrinsicPaddingTop();
            int adjustedPaddingBottom = cell->paddingBottom() - cell->intrinsicPaddingBottom();
            int adjustedHeight = cell->height() - (cell->intrinsicPaddingTop() + cell->intrinsicPaddingBottom());
        
            // Explicit heights use the border box in quirks mode.  In strict mode do the right
            // thing and actually add in the border and padding.
            ch = cell->style()->height().calcValue(0) + 
                (cell->style()->htmlHacks() ? 0 : (adjustedPaddingTop + adjustedPaddingBottom +
                                                   cell->borderTop() + cell->borderBottom()));
            ch = max(ch, adjustedHeight);

            pos = m_rowPos[indx] + ch + (m_grid[r].rowRenderer ? spacing : 0);

            m_rowPos[r + 1] = max(m_rowPos[r + 1], pos);

            // find out the baseline
            EVerticalAlign va = cell->style()->verticalAlign();
            if (va == BASELINE || va == TEXT_BOTTOM || va == TEXT_TOP || va == SUPER || va == SUB) {
                int b = cell->baselinePosition();
                if (b > cell->borderTop() + cell->paddingTop()) {
                    baseline = max(baseline, b - cell->intrinsicPaddingTop());
                    bdesc = max(bdesc, m_rowPos[indx] + ch - (b - cell->intrinsicPaddingTop()));
                }
            }
        }

        //do we have baseline aligned elements?
        if (baseline) {
            // increase rowheight if baseline requires
            m_rowPos[r + 1] = max(m_rowPos[r + 1], baseline + bdesc + (m_grid[r].rowRenderer ? spacing : 0));
            m_grid[r].baseline = baseline;
        }