swnewtable.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <swtable.hxx>
#include <tblsel.hxx>
#include <tblrwcl.hxx>
#include <ndtxt.hxx>
#include <ndole.hxx>
#include <node.hxx>
#include <UndoTable.hxx>
#include <pam.hxx>
#include <frmfmt.hxx>
#include <frmatr.hxx>
#include <cellfrm.hxx>
#include <fmtfsize.hxx>
#include <doc.hxx>
#include <IDocumentUndoRedo.hxx>
#include <IDocumentChartDataProviderAccess.hxx>
#include <IDocumentContentOperations.hxx>
#include <IDocumentFieldsAccess.hxx>
#include <IDocumentLayoutAccess.hxx>
#include <IDocumentMarkAccess.hxx>
#include <IDocumentRedlineAccess.hxx>
#include <ftnidx.hxx>
#include <cstdlib>
#include <vector>
#include <set>
#include <list>
#include <memory>
#include <editeng/boxitem.hxx>
#include <editeng/protitem.hxx>
#include <swtblfmt.hxx>
#include <calbck.hxx>
#include <sal/log.hxx>

#ifdef DBG_UTIL
#define CHECK_TABLE(t) (t).CheckConsistency();
#else
#define CHECK_TABLE(t)
#endif

class SwBoxSelection
{
public:
    std::vector<SwSelBoxes> maBoxes;
    tools::Long mnMergeWidth;
    SwBoxSelection() : mnMergeWidth(0) {}
    bool isEmpty() const { return maBoxes.empty(); }
    void push_back(const SwSelBoxes& rNew) { maBoxes.push_back(rNew); }
};

bool SwTable::NewMerge( SwDoc* pDoc, const SwSelBoxes& rBoxes,
     const SwSelBoxes& rMerged, SwUndoTableMerge* pUndo )
{
    if( pUndo )
        pUndo->SetSelBoxes( rBoxes );
    DeleteSel( pDoc, rBoxes, &rMerged, nullptr, true, true );

    CHECK_TABLE( *this )
    return true;
}

static void lcl_CheckMinMax( tools::Long& rMin, tools::Long& rMax, const SwTableLine& rLine, size_t nCheck, bool bSet )
{
    ++nCheck;
    if( rLine.GetTabBoxes().size() < nCheck )
    {   // robust
        OSL_FAIL( "Box out of table line" );
        nCheck = rLine.GetTabBoxes().size();
    }

    tools::Long nNew = 0; // will be the right border of the current box
    tools::Long nWidth = 0; // the width of the current box
    for( size_t nCurrBox = 0; nCurrBox < nCheck; ++nCurrBox )
    {
        SwTableBox* pBox = rLine.GetTabBoxes()[nCurrBox];
        OSL_ENSURE( pBox, "Missing table box" );
        nWidth = pBox->GetFrameFormat()->GetFrameSize().GetWidth();
        nNew += nWidth;
    }
    // nNew is the right border of the wished box
    if( bSet || nNew > rMax )
        rMax = nNew;
    nNew -= nWidth; // nNew becomes the left border of the wished box
    if( bSet || nNew < rMin )
        rMin = nNew;
}

static tools::Long lcl_Box2LeftBorder( const SwTableBox& rBox )
{
    if( !rBox.GetUpper() )
        return 0;
    tools::Long nLeft = 0;
    const SwTableLine &rLine = *rBox.GetUpper();
    const size_t nCount = rLine.GetTabBoxes().size();
    for( size_t nCurrBox = 0; nCurrBox < nCount; ++nCurrBox )
    {
        SwTableBox* pBox = rLine.GetTabBoxes()[nCurrBox];
        OSL_ENSURE( pBox, "Missing table box" );
        if( pBox == &rBox )
            return nLeft;
        nLeft += pBox->GetFrameFormat()->GetFrameSize().GetWidth();
    }
    OSL_FAIL( "Box not found in own upper?" );
    return nLeft;
}

static SwTableBox* lcl_LeftBorder2Box( tools::Long nLeft, const SwTableLine* pLine )
{
    if( !pLine )
        return nullptr;
    tools::Long nCurrLeft = 0;
    const size_t nCount = pLine->GetTabBoxes().size();
    for( size_t nCurrBox = 0; nCurrBox < nCount; ++nCurrBox )
    {
        SwTableBox* pBox = pLine->GetTabBoxes()[nCurrBox];
        OSL_ENSURE( pBox, "Missing table box" );
        if( pBox->GetFrameFormat()->GetFrameSize().GetWidth() )
        {
            if( nCurrLeft == nLeft )
                return pBox;
            // HACK: It appears that rounding errors may result in positions not matching
            // exactly, so allow a little tolerance. This happens at least with merged cells
            // in the doc from fdo#38414 .
            if( std::abs( nCurrLeft - nLeft ) <= ( nLeft / 1000 ))
                return pBox;
            if( nCurrLeft >= nLeft )
            {
                SAL_WARN( "sw.core", "Possibly wrong box found" );
                return pBox;
            }
        }
        nCurrLeft += pBox->GetFrameFormat()->GetFrameSize().GetWidth();
    }
    OSL_FAIL( "Didn't find wished box" );
    return nullptr;
}

static void lcl_ChangeRowSpan( const SwTable& rTable, const tools::Long nDiff,
                        sal_uInt16 nRowIdx, const bool bSingle )
{
    if( !nDiff || nRowIdx >= rTable.GetTabLines().size() )
        return;
    OSL_ENSURE( !bSingle || nDiff > 0, "Don't set bSingle when deleting lines!" );
    bool bGoOn;
    // nDistance is the distance between the current row and the critical row,
    // e.g. the deleted rows or the inserted rows.
    // If the row span is lower than the distance there is nothing to do
    // because the row span ends before the critical area.
    // When the inserted rows should not be overlapped by row spans which ends
    // exactly in the row above, the trick is to start with a distance of 1.
    tools::Long nDistance = bSingle ? 1 : 0;
    do
    {
        bGoOn = false; // will be set to true if we found a non-master cell
        // which has to be manipulated => we have to check the previous row, too.
        const SwTableLine* pLine = rTable.GetTabLines()[ nRowIdx ];
        const size_t nBoxCount = pLine->GetTabBoxes().size();
        for( size_t nCurrBox = 0; nCurrBox < nBoxCount; ++nCurrBox )
        {
            tools::Long nRowSpan = pLine->GetTabBoxes()[nCurrBox]->getRowSpan();
            tools::Long nAbsSpan = nRowSpan > 0 ? nRowSpan : -nRowSpan;
            // Check if the last overlapped cell is above or below
            // the critical area
            if( nAbsSpan > nDistance )
            {
                if( nDiff > 0 )
                {
                    if( nRowSpan > 0 )
                        nRowSpan += nDiff; // increment row span of master cell
                    else
                    {
                        nRowSpan -= nDiff; // increment row span of non-master cell
                        bGoOn = true;
                    }
                }
                else
                {
                    if( nRowSpan > 0 )
                    {   // A master cell
                         // end of row span behind the deleted area ..
                        if( nRowSpan - nDistance > -nDiff )
                            nRowSpan += nDiff;
                        else // .. or inside the deleted area
                            nRowSpan = nDistance + 1;
                    }
                    else
                    {   // Same for a non-master cell
                        if( nRowSpan + nDistance < nDiff )
                            nRowSpan -= nDiff;
                        else
                            nRowSpan = -nDistance - 1;
                        bGoOn = true; // We have to continue
                    }
                }
                pLine->GetTabBoxes()[ nCurrBox ]->setRowSpan( nRowSpan );
            }
        }
        ++nDistance;
        if( nRowIdx )
            --nRowIdx;
        else
            bGoOn = false; //robust
    } while( bGoOn );
}

std::unique_ptr<SwBoxSelection> SwTable::CollectBoxSelection( const SwPaM& rPam ) const
{
    OSL_ENSURE( m_bNewModel, "Don't call me for old tables" );
    if( m_aLines.empty() )
        return nullptr;
    const SwNode* pStartNd = rPam.Start()->nNode.GetNode().FindTableBoxStartNode();
    const SwNode* pEndNd = rPam.End()->nNode.GetNode().FindTableBoxStartNode();
    if( !pStartNd || !pEndNd || pStartNd == pEndNd )
        return nullptr;

    const size_t nLines = m_aLines.size();
    size_t nTop = 0;
    size_t nBottom = 0;
    tools::Long nMin = 0, nMax = 0;
    int nFound = 0;
    for( size_t nRow = 0; nFound < 2 && nRow < nLines; ++nRow )
    {
        SwTableLine* pLine = m_aLines[nRow];
        OSL_ENSURE( pLine, "Missing table line" );
        const size_t nCols = pLine->GetTabBoxes().size();
        for( size_t nCol = 0; nCol < nCols; ++nCol )
        {
            SwTableBox* pBox = pLine->GetTabBoxes()[nCol];
            OSL_ENSURE( pBox, "Missing table box" );
            if( nFound )
            {
                if( pBox->GetSttNd() == pEndNd )
                {
                    nBottom = nRow;
                    lcl_CheckMinMax( nMin, nMax, *pLine, nCol, false );
                    ++nFound;
                    break;
                }
            }
            else if( pBox->GetSttNd() == pStartNd )
            {
                nTop = nRow;
                lcl_CheckMinMax( nMin, nMax, *pLine, nCol, true );
                ++nFound;
            }
        }
    }
    if( nFound < 2 )
        return nullptr;

    bool bOkay = true;
    tools::Long nMid = ( nMin + nMax ) / 2;

    auto pRet(std::make_unique<SwBoxSelection>());
    std::vector< std::pair< SwTableBox*, long > > aNewWidthVector;
    size_t nCheckBottom = nBottom;
    tools::Long nLeftSpan = 0;
    tools::Long nRightSpan = 0;
    tools::Long nLeftSpanCnt = 0;
    tools::Long nRightSpanCnt = 0;
    for( size_t nRow = nTop; nRow <= nBottom && bOkay && nRow < nLines; ++nRow )
    {
        SwTableLine* pLine = m_aLines[nRow];
        OSL_ENSURE( pLine, "Missing table line" );
        SwSelBoxes aBoxes;
        tools::Long nRight = 0;
        const size_t nCount = pLine->GetTabBoxes().size();
        for( size_t nCurrBox = 0; nCurrBox < nCount; ++nCurrBox )
        {
            SwTableBox* pBox = pLine->GetTabBoxes()[nCurrBox];
            OSL_ENSURE( pBox, "Missing table box" );
            tools::Long nLeft = nRight;
            nRight += pBox->GetFrameFormat()->GetFrameSize().GetWidth();
            tools::Long nRowSpan = pBox->getRowSpan();
            if( nRight <= nMin )
            {
                if( nRight == nMin && nLeftSpanCnt )
                    bOkay = false;
                continue;
            }
            SwTableBox* pInnerBox = nullptr;
            SwTableBox* pLeftBox = nullptr;
            SwTableBox* pRightBox = nullptr;
            tools::Long nDiff = 0;
            tools::Long nDiff2 = 0;
            if( nLeft < nMin )
            {
                if( nRight >= nMid || nRight + nLeft >= nMin + nMin )
                {
                    if( nCurrBox )
                    {
                        aBoxes.insert(pBox);
                        pInnerBox = pBox;
                        pLeftBox = pLine->GetTabBoxes()[nCurrBox-1];
                        nDiff = nMin - nLeft;
                        if( nRight > nMax )
                        {
                            if( nCurrBox+1 < nCount )
                            {
                                pRightBox = pLine->GetTabBoxes()[nCurrBox+1];
                                nDiff2 = nRight - nMax;
                            }
                            else
                                bOkay = false;
                        }
                        else if( nRightSpanCnt && nRight == nMax )
                            bOkay = false;
                    }
                    else
                        bOkay = false;
                }
                else if( nCurrBox+1 < nCount )
                {
                    pLeftBox = pBox;
                    pInnerBox = pLine->GetTabBoxes()[nCurrBox+1];
                    nDiff = nMin - nRight;
                }
                else
                    bOkay = false;
            }
            else if( nRight <= nMax )
            {
                aBoxes.insert(pBox);
                if( nRow == nTop && nRowSpan < 0 )
                {
                    bOkay = false;
                    break;
                }
                if( nRowSpan > 1 && nRow + nRowSpan - 1 > nBottom )
                    nBottom = nRow + nRowSpan - 1;
                if( nRowSpan < -1 && nRow - nRowSpan - 1 > nBottom )
                    nBottom = nRow - nRowSpan - 1;
                if( nRightSpanCnt && nRight == nMax )
                    bOkay = false;
            }
            else if( nLeft < nMax )
            {
                if( nLeft <= nMid || nRight + nLeft <= nMax )
                {
                    if( nCurrBox+1 < nCount )
                    {
                        aBoxes.insert(pBox);
                        pInnerBox = pBox;
                        pRightBox = pLine->GetTabBoxes()[nCurrBox+1];
                        nDiff = nRight - nMax;
                    }
                    else
                        bOkay = false;
                }
                else if( nCurrBox )
                {
                    pRightBox = pBox;
                    pInnerBox = pLine->GetTabBoxes()[nCurrBox-1];
                    nDiff = nLeft - nMax;
                }
                else
                    bOkay = false;
            }
            else
                break;
            if( pInnerBox )
            {
                if( nRow == nBottom )
                {
                    tools::Long nTmpSpan = pInnerBox->getRowSpan();
                    if( nTmpSpan > 1 )
                        nBottom += nTmpSpan - 1;
                    else if( nTmpSpan < -1 )
                        nBottom -= nTmpSpan + 1;
                }
                SwTableBox* pOuterBox = pLeftBox;
                do
                {
                    if( pOuterBox )
                    {
                        tools::Long nOutSpan = pOuterBox->getRowSpan();
                        if( nOutSpan != 1 )
                        {
                            size_t nCheck = nRow;
                            if( nOutSpan < 0 )
                            {
                                const SwTableBox& rBox =
                                    pOuterBox->FindStartOfRowSpan( *this );
                                nOutSpan = rBox.getRowSpan();
                                const SwTableLine* pTmpL = rBox.GetUpper();
                                nCheck = GetTabLines().GetPos( pTmpL );
                                if( nCheck < nTop )
                                    bOkay = false;
                                if( pOuterBox == pLeftBox )
                                {
                                    if( !nLeftSpanCnt || nMin - nDiff != nLeftSpan )
                                        bOkay = false;
                                }
                                else
                                {
                                    if( !nRightSpanCnt || nMax + nDiff != nRightSpan )
                                        bOkay = false;
                                }
                            }
                            else
                            {
                                if( pOuterBox == pLeftBox )
                                {
                                    if( nLeftSpanCnt )
                                        bOkay = false;
                                    nLeftSpan = nMin - nDiff;
                                    nLeftSpanCnt = nOutSpan;
                                }
                                else
                                {
                                    if( nRightSpanCnt )
                                        bOkay = false;
                                    nRightSpan = nMax + nDiff;
                                    nRightSpanCnt = nOutSpan;
                                }
                            }
                            nCheck += nOutSpan - 1;
                            if( nCheck > nCheckBottom )
                                nCheckBottom = nCheck;
                        }
                        else if( ( nLeftSpanCnt && pLeftBox == pOuterBox ) ||
                            ( nRightSpanCnt && pRightBox == pOuterBox ) )
                            bOkay = false;
                        std::pair< SwTableBox*, long > aTmp;
                        aTmp.first = pInnerBox;
                        aTmp.second = -nDiff;
                        aNewWidthVector.push_back(aTmp);
                        aTmp.first = pOuterBox;
                        aTmp.second = nDiff;
                        aNewWidthVector.push_back(aTmp);
                    }
                    pOuterBox = pOuterBox == pRightBox ? nullptr : pRightBox;
                    if( nDiff2 )
                        nDiff = nDiff2;
                } while( pOuterBox );
            }
        }
        if( nLeftSpanCnt )
            --nLeftSpanCnt;
        if( nRightSpanCnt )
            --nRightSpanCnt;
        pRet->push_back(aBoxes);
    }
    if( nCheckBottom > nBottom )
        bOkay = false;
    if( bOkay )
    {
        pRet->mnMergeWidth = nMax - nMin;
        for (auto const& newWidth : aNewWidthVector)
        {
            SwFrameFormat* pFormat = newWidth.first->ClaimFrameFormat();
            tools::Long nNewWidth = pFormat->GetFrameSize().GetWidth() + newWidth.second;
            pFormat->SetFormatAttr( SwFormatFrameSize( SwFrameSize::Variable, nNewWidth, 0 ) );
        }
    }
    else
        pRet.reset();

    return pRet;
}

static void lcl_InvalidateCellFrame( const SwTableBox& rBox )
{
    SwIterator<SwCellFrame,SwFormat> aIter( *rBox.GetFrameFormat() );
    for( SwCellFrame* pCell = aIter.First(); pCell; pCell = aIter.Next() )
    {
        if( pCell->GetTabBox() == &rBox )
        {
            pCell->InvalidateSize();
            SwFrame* pLower = pCell->GetLower();
            if( pLower )
                pLower->InvalidateSize_();
        }
    }
}

static tools::Long lcl_InsertPosition( SwTable &rTable, std::vector<sal_uInt16>& rInsPos,
    const SwSelBoxes& rBoxes, bool bBehind )
{
    sal_Int32 nAddWidth = 0;
    tools::Long nCount = 0;
    for (size_t j = 0; j < rBoxes.size(); ++j)
    {
        SwTableBox *pBox = rBoxes[j];
        SwTableLine* pLine = pBox->GetUpper();
        tools::Long nWidth = rBoxes[j]->GetFrameFormat()->GetFrameSize().GetWidth();
        nAddWidth += nWidth;
        sal_uInt16 nCurrBox = pLine->GetBoxPos( pBox );
        sal_uInt16 nCurrLine = rTable.GetTabLines().GetPos( pLine );
        OSL_ENSURE( nCurrLine != USHRT_MAX, "Time to say Good-Bye.." );
        if( rInsPos[ nCurrLine ] == USHRT_MAX )
        {
            rInsPos[ nCurrLine ] = nCurrBox;
            ++nCount;
        }
        else if( ( rInsPos[ nCurrLine ] > nCurrBox ) == !bBehind )
            rInsPos[ nCurrLine ] = nCurrBox;
    }
    if( nCount )
        nAddWidth /= nCount;
    return nAddWidth;
}

bool SwTable::NewInsertCol( SwDoc& rDoc, const SwSelBoxes& rBoxes,
    sal_uInt16 nCnt, bool bBehind )
{
    if( m_aLines.empty() || !nCnt )
        return false;

    CHECK_TABLE( *this )
    tools::Long nNewBoxWidth = 0;
    std::vector< sal_uInt16 > aInsPos( m_aLines.size(), USHRT_MAX );
    { // Calculation of the insert positions and the width of the new boxes
        sal_uInt64 nTableWidth = 0;
        for( size_t i = 0; i < m_aLines[0]->GetTabBoxes().size(); ++i )
            nTableWidth += m_aLines[0]->GetTabBoxes()[i]->GetFrameFormat()->GetFrameSize().GetWidth();

        // Fill the vector of insert positions and the (average) width to insert
        sal_uInt64 nAddWidth = lcl_InsertPosition( *this, aInsPos, rBoxes, bBehind );

        // Given is the (average) width of the selected boxes, if we would
        // insert nCnt of columns the table would grow
        // So we will shrink the table first, then insert the new boxes and
        // get a table with the same width than before.
        // But we will not shrink the table by the full already calculated value,
        // we will reduce this value proportional to the old table width
        nAddWidth *= nCnt; // we have to insert nCnt boxes per line
        sal_uInt64 nResultingWidth = nAddWidth + nTableWidth;
        if( !nResultingWidth )
            return false;
        nAddWidth = (nAddWidth * nTableWidth) / nResultingWidth;
        nNewBoxWidth = tools::Long( nAddWidth / nCnt ); // Rounding
        nAddWidth = nNewBoxWidth * nCnt; // Rounding
        if( !nAddWidth || nAddWidth >= nTableWidth )
            return false;
        AdjustWidths( static_cast< tools::Long >(nTableWidth), static_cast< tools::Long >(nTableWidth - nAddWidth) );
    }

    FndBox_ aFndBox( nullptr, nullptr );
    aFndBox.SetTableLines( rBoxes, *this );
    aFndBox.DelFrames( *this );

    SwTableNode* pTableNd = GetTableNode();
    std::vector<SwTableBoxFormat*> aInsFormat( nCnt, nullptr );
    size_t nLastLine = SAL_MAX_SIZE;
    tools::Long nLastRowSpan = 1;

    for( size_t i = 0; i < m_aLines.size(); ++i )
    {
        SwTableLine* pLine = m_aLines[ i ];
        sal_uInt16 nInsPos = aInsPos[i];
        assert(nInsPos != USHRT_MAX); // didn't find insert position
        SwTableBox* pBox = pLine->GetTabBoxes()[ nInsPos ];
        if( bBehind )
            ++nInsPos;
        SwTableBoxFormat* pBoxFrameFormat = static_cast<SwTableBoxFormat*>(pBox->GetFrameFormat());
        ::InsTableBox( rDoc, pTableNd, pLine, pBoxFrameFormat, pBox, nInsPos, nCnt );
        tools::Long nRowSpan = pBox->getRowSpan();
        tools::Long nDiff = i - nLastLine;
        bool bNewSpan = false;
        if( nLastLine != SAL_MAX_SIZE && nDiff <= nLastRowSpan &&
            nRowSpan != nDiff - nLastRowSpan )
        {
            bNewSpan = true;
            while( nLastLine < i )
            {
                SwTableLine* pTmpLine = m_aLines[ nLastLine ];
                sal_uInt16 nTmpPos = aInsPos[nLastLine];
                if( bBehind )
                    ++nTmpPos;
                for( sal_uInt16 j = 0; j < nCnt; ++j )
                    pTmpLine->GetTabBoxes()[nTmpPos+j]->setRowSpan( nDiff );
                if( nDiff > 0 )
                    nDiff = -nDiff;
                ++nDiff;
                ++nLastLine;
            }
        }
        if( nRowSpan > 0 )
            bNewSpan = true;
        if( bNewSpan )
        {
            nLastLine = i;
            if( nRowSpan < 0 )
                nLastRowSpan = -nRowSpan;
            else
                nLastRowSpan = nRowSpan;
        }
        const SvxBoxItem& aSelBoxItem = pBoxFrameFormat->GetBox();
        std::unique_ptr<SvxBoxItem> pNoRightBorder;
        if( aSelBoxItem.GetRight() )
        {
            pNoRightBorder.reset( new SvxBoxItem( aSelBoxItem ));
            pNoRightBorder->SetLine( nullptr, SvxBoxItemLine::RIGHT );
        }
        for( sal_uInt16 j = 0; j < nCnt; ++j )
        {
            SwTableBox *pCurrBox = pLine->GetTabBoxes()[nInsPos+j];
            if( bNewSpan )
            {
                pCurrBox->setRowSpan( nLastRowSpan );
                SwFrameFormat* pFrameFormat = pCurrBox->ClaimFrameFormat();
                SwFormatFrameSize aFrameSz( pFrameFormat->GetFrameSize() );
                aFrameSz.SetWidth( nNewBoxWidth );
                pFrameFormat->SetFormatAttr( aFrameSz );
                if( pNoRightBorder && ( !bBehind || j+1 < nCnt ) )
                    pFrameFormat->SetFormatAttr( *pNoRightBorder );
                aInsFormat[j] = static_cast<SwTableBoxFormat*>(pFrameFormat);
            }
            else
                pCurrBox->ChgFrameFormat( aInsFormat[j] );
        }
        if( bBehind && pNoRightBorder )
        {
            SwFrameFormat* pFrameFormat = pBox->ClaimFrameFormat();
            pFrameFormat->SetFormatAttr( *pNoRightBorder );
        }
    }

    aFndBox.MakeFrames( *this );
#if OSL_DEBUG_LEVEL > 0
    {
        const SwTableBoxes &rTabBoxes = m_aLines[0]->GetTabBoxes();
        tools::Long nNewWidth = 0;
        for( size_t i = 0; i < rTabBoxes.size(); ++i )
            nNewWidth += rTabBoxes[i]->GetFrameFormat()->GetFrameSize().GetWidth();
        OSL_ENSURE( nNewWidth > 0, "Very small" );
    }
#endif
    CHECK_TABLE( *this )

    return true;
}

bool SwTable::PrepareMerge( const SwPaM& rPam, SwSelBoxes& rBoxes,
   SwSelBoxes& rMerged, SwTableBox** ppMergeBox, SwUndoTableMerge* pUndo )
{
    if( !m_bNewModel )
    {
        ::GetMergeSel( rPam, rBoxes, ppMergeBox, pUndo );
        return rBoxes.size() > 1;
    }
    CHECK_TABLE( *this )
    // We have to assert a "rectangular" box selection before we start to merge
    std::unique_ptr< SwBoxSelection > pSel( CollectBoxSelection( rPam ) );
    if (!pSel || pSel->isEmpty())
        return false;
    // Now we should have a rectangle of boxes,
    // i.e. contiguous cells in contiguous rows
    bool bMerge = false; // will be set if any content is transferred from
    // a "not already overlapped" cell into the new master cell.
    const SwSelBoxes& rFirstBoxes = pSel->maBoxes[0];
    if (rFirstBoxes.empty())
        return false;
    SwTableBox *pMergeBox = rFirstBoxes[0]; // the master cell box
    if( !pMergeBox )
        return false;
    (*ppMergeBox) = pMergeBox;
    // The new master box will get the left and the top border of the top-left
    // box of the selection and because the new master cell _is_ the top-left
    // box, the left and right border does not need to be changed.
    // The right and bottom border instead has to be derived from the right-
    // bottom box of the selection. If this is an overlapped cell,
    // the appropriate master box.
    SwTableBox* pLastBox = nullptr; // the right-bottom (master) cell
    SwDoc* pDoc = GetFrameFormat()->GetDoc();
    SwPosition aInsPos( *pMergeBox->GetSttNd()->EndOfSectionNode() );
    SwPaM aChkPam( aInsPos );
    // The number of lines in the selection rectangle: nLineCount
    const size_t nLineCount = pSel->maBoxes.size();
    // BTW: nLineCount is the rowspan of the new master cell
    tools::Long nRowSpan = static_cast<tools::Long>(nLineCount);
    // We will need the first and last line of the selection
    // to check if there any superfluous row after merging
    SwTableLine* pFirstLn = nullptr;
    SwTableLine* pLastLn = nullptr;
    // Iteration over the lines of the selection...
    for( size_t nCurrLine = 0; nCurrLine < nLineCount; ++nCurrLine )
    {
        // The selected boxes in the current line
        const SwSelBoxes& rLineBoxes = pSel->maBoxes[nCurrLine];
        size_t nColCount = rLineBoxes.size();
        // Iteration over the selected cell in the current row
        for (size_t nCurrCol = 0; nCurrCol < nColCount; ++nCurrCol)
        {
            SwTableBox* pBox = rLineBoxes[nCurrCol];
            rMerged.insert( pBox );
            // Only the first selected cell in every row will be alive,
            // the other will be deleted => put into rBoxes
            if( nCurrCol )
                rBoxes.insert( pBox );
            else
            {
                if( nCurrLine == 1 )
                    pFirstLn = pBox->GetUpper(); // we need this line later on
                if( nCurrLine + 1 == nLineCount )
                    pLastLn = pBox->GetUpper(); // and this one, too.
            }
            // A box has to be merged if it's not the master box itself,
            // but an already overlapped cell must not be merged as well.
            bool bDoMerge = pBox != pMergeBox && pBox->getRowSpan() > 0;
            // The last box has to be in the last "column" of the selection
            // and it has to be a master cell
            if( nCurrCol+1 == nColCount && pBox->getRowSpan() > 0 )
                pLastBox = pBox;
            if( bDoMerge )
            {
                bMerge = true;
                // If the cell to merge contains only one empty paragraph,
                // we do not transfer this paragraph.
                if( !IsEmptyBox( *pBox, aChkPam ) )
                {
                    SwNodeIndex& rInsPosNd = aInsPos.nNode;
                    SwPaM aPam( aInsPos );
                    aPam.GetPoint()->nNode.Assign( *pBox->GetSttNd()->EndOfSectionNode(), -1 );
                    SwContentNode* pCNd = aPam.GetContentNode();
                    aPam.GetPoint()->nContent.Assign( pCNd, pCNd ? pCNd->Len() : 0 );
                    SwNodeIndex aSttNdIdx( *pBox->GetSttNd(), 1 );
                    bool const bUndo = pDoc->GetIDocumentUndoRedo().DoesUndo();
                    if( pUndo )
                    {
                        pDoc->GetIDocumentUndoRedo().DoUndo(false);
                    }
                    pDoc->getIDocumentContentOperations().AppendTextNode( *aPam.GetPoint() );
                    if( pUndo )
                    {
                        pDoc->GetIDocumentUndoRedo().DoUndo(bUndo);
                    }
                    SwNodeRange aRg( aSttNdIdx, aPam.GetPoint()->nNode );
                    if( pUndo )
                        pUndo->MoveBoxContent( *pDoc, aRg, rInsPosNd );
                    else
                    {
                        pDoc->getIDocumentContentOperations().MoveNodeRange( aRg, rInsPosNd,
                            SwMoveFlags::NO_DELFRMS );
                    }
                }
            }
            // Only the cell of the first selected column will stay alive
            // and got a new row span
            if( !nCurrCol )
                pBox->setRowSpan( nRowSpan );
        }
        if( nRowSpan > 0 ) // the master cell is done, from now on we set
            nRowSpan = -nRowSpan; // negative row spans
        ++nRowSpan; // ... -3, -2, -1
    }
    if( bMerge )
    {
        // A row containing overlapped cells is superfluous,
        // these cells can be put into rBoxes for deletion
        FindSuperfluousRows_( rBoxes, pFirstLn, pLastLn );
        // pNewFormat will be set to the new master box and the overlapped cells
        SwFrameFormat* pNewFormat = pMergeBox->ClaimFrameFormat();
        pNewFormat->SetFormatAttr( SwFormatFrameSize( SwFrameSize::Variable, pSel->mnMergeWidth, 0 ) );
        for( size_t nCurrLine = 0; nCurrLine < nLineCount; ++nCurrLine )
        {
            const SwSelBoxes& rLineBoxes = pSel->maBoxes[nCurrLine];
            size_t nColCount = rLineBoxes.size();
            for (size_t nCurrCol = 0; nCurrCol < nColCount; ++nCurrCol)
            {
                SwTableBox* pBox = rLineBoxes[nCurrCol];
                if( nCurrCol )
                {
                    // Even this box will be deleted soon,
                    // we have to correct the width to avoid side effects
                    SwFrameFormat* pFormat = pBox->ClaimFrameFormat();
                    pFormat->SetFormatAttr( SwFormatFrameSize( SwFrameSize::Variable, 0, 0 ) );
                }
                else
                {
                    pBox->ChgFrameFormat( static_cast<SwTableBoxFormat*>(pNewFormat) );
                    // remove numbering from cells that will be disabled in the merge
                    if( nCurrLine )
                    {
                        SwPaM aPam( *pBox->GetSttNd(), 0 );
                        aPam.GetPoint()->nNode++;
                        SwTextNode* pNd = aPam.GetNode().GetTextNode();
                        while( pNd )
                        {
                            pNd->SetCountedInList( false );

                            aPam.GetPoint()->nNode++;
                            pNd = aPam.GetNode().GetTextNode();
                        }
                    }
                }
            }
        }
        if( pLastBox ) // Robust
        {
            // The new borders of the master cell...
            SvxBoxItem aBox( pMergeBox->GetFrameFormat()->GetBox() );
            bool bOld = aBox.GetRight() || aBox.GetBottom();
            const SvxBoxItem& rBox = pLastBox->GetFrameFormat()->GetBox();
            aBox.SetLine( rBox.GetRight(), SvxBoxItemLine::RIGHT );
            aBox.SetLine( rBox.GetBottom(), SvxBoxItemLine::BOTTOM );
            if( bOld || aBox.GetLeft() || aBox.GetTop() || aBox.GetRight() || aBox.GetBottom() )
                (*ppMergeBox)->GetFrameFormat()->SetFormatAttr( aBox );
        }

        if( pUndo )
            pUndo->AddNewBox( pMergeBox->GetSttIdx() );
    }
    return bMerge;
}

void SwTable::FindSuperfluousRows_( SwSelBoxes& rBoxes,
    SwTableLine* pFirstLn, SwTableLine* pLastLn )
{
    if( !pFirstLn || !pLastLn )
    {
        if( rBoxes.empty() )
            return;
        pFirstLn = rBoxes[0]->GetUpper();
        pLastLn = rBoxes.back()->GetUpper();
    }
    sal_uInt16 nFirstLn = GetTabLines().GetPos( pFirstLn );
    sal_uInt16 nLastLn = GetTabLines().GetPos( pLastLn );
    for( sal_uInt16 nRow = nFirstLn; nRow <= nLastLn; ++nRow )
    {
        SwTableLine* pLine = m_aLines[nRow];
        OSL_ENSURE( pLine, "Missing table line" );
        const size_t nCols = pLine->GetTabBoxes().size();
        bool bSuperfl = true;
        for( size_t nCol = 0; nCol < nCols; ++nCol )
        {
            SwTableBox *pBox = pLine->GetTabBoxes()[nCol];
            if( pBox->getRowSpan() > 0 &&
                rBoxes.end() == rBoxes.find( pBox ) )
            {
                bSuperfl = false;
                break;
            }
        }
        if( bSuperfl )
        {
            for( size_t nCol = 0; nCol < nCols; ++nCol )
            {
                SwTableBox* pBox = pLine->GetTabBoxes()[nCol];
                rBoxes.insert( pBox );
            }
        }
    }
}

SwTableBox& SwTableBox::FindStartOfRowSpan( const SwTable& rTable, sal_uInt16 nMaxStep )
{
    if( getRowSpan() > 0 || !nMaxStep )
        return *this;

    tools::Long nLeftBorder = lcl_Box2LeftBorder( *this );
    SwTableBox* pBox = this;
    const SwTableLine* pMyUpper = GetUpper();
    sal_uInt16 nLine = rTable.GetTabLines().GetPos( pMyUpper );
    if( nLine && nLine < rTable.GetTabLines().size() )
    {
        SwTableBox* pNext;
        do
        {
            pNext = lcl_LeftBorder2Box( nLeftBorder, rTable.GetTabLines()[--nLine] );
            if( pNext )
                pBox = pNext;
        } while( nLine && --nMaxStep && pNext && pBox->getRowSpan() < 1 );
    }

    return *pBox;
}

SwTableBox& SwTableBox::FindEndOfRowSpan( const SwTable& rTable, sal_uInt16 nMaxStep )
{
    tools::Long nAbsSpan = getRowSpan();
    if( nAbsSpan < 0 )
        nAbsSpan = -nAbsSpan;
    if( nAbsSpan == 1 || !nMaxStep )
        return *this;

    if( nMaxStep > --nAbsSpan )
        nMaxStep = static_cast<sal_uInt16>(nAbsSpan);
    const SwTableLine* pMyUpper = GetUpper();
    sal_uInt16 nLine = rTable.GetTabLines().GetPos( pMyUpper );
    nMaxStep = nLine + nMaxStep;
    if( nMaxStep >= rTable.GetTabLines().size() )
        nMaxStep = rTable.GetTabLines().size() - 1;
    tools::Long nLeftBorder = lcl_Box2LeftBorder( *this );
    SwTableBox* pBox =
        lcl_LeftBorder2Box( nLeftBorder, rTable.GetTabLines()[ nMaxStep ] );
    if ( !pBox )
        pBox = this;

    return *pBox;
}

static void lcl_getAllMergedBoxes( const SwTable& rTable, SwSelBoxes& rBoxes, SwTableBox& rBox )
{
    SwTableBox* pBox = &rBox;
    OSL_ENSURE( pBox == &rBox.FindStartOfRowSpan( rTable ), "Not a master box" );
    rBoxes.insert( pBox );
    if( pBox->getRowSpan() == 1 )
        return;
    const SwTableLine* pMyUpper = pBox->GetUpper();
    sal_uInt16 nLine = rTable.GetTabLines().GetPos( pMyUpper );
    tools::Long nLeftBorder = lcl_Box2LeftBorder( *pBox );
    sal_uInt16 nCount = rTable.GetTabLines().size();
    while( ++nLine < nCount && pBox && pBox->getRowSpan() != -1 )
    {
        pBox = lcl_LeftBorder2Box( nLeftBorder, rTable.GetTabLines()[nLine] );
        if( pBox )
            rBoxes.insert( pBox );
    }
}

static void lcl_UnMerge( const SwTable& rTable, SwTableBox& rBox, size_t nCnt,
    bool bSameHeight )
{
    SwSelBoxes aBoxes;
    lcl_getAllMergedBoxes( rTable, aBoxes, rBox );
    size_t const nCount = aBoxes.size();
    if( nCount < 2 )
        return;
    if( nCnt > nCount )
        nCnt = nCount;
    std::unique_ptr<size_t[]> const pSplitIdx(new size_t[nCnt]);
    if( bSameHeight )
    {
        std::unique_ptr<SwTwips[]> const pHeights(new SwTwips[nCount]);
        SwTwips nHeight = 0;
        for (size_t i = 0; i < nCount; ++i)
        {
            SwTableLine* pLine = aBoxes[ i ]->GetUpper();
            SwFrameFormat *pRowFormat = pLine->GetFrameFormat();
            pHeights[ i ] = pRowFormat->GetFrameSize().GetHeight();
            nHeight += pHeights[ i ];
        }
        SwTwips nSumH = 0;
        size_t nIdx = 0;
        for (size_t i = 1; i <= nCnt; ++i)
        {
            SwTwips nSplit = ( i * nHeight ) / nCnt;
            while( nSumH < nSplit && nIdx < nCount )
                nSumH += pHeights[ nIdx++ ];
            pSplitIdx[ i - 1 ] = nIdx;
        }
    }
    else
    {
        for (size_t i = 1; i <= nCnt; ++i)
        {
            pSplitIdx[ i - 1 ] = ( i * nCount ) / nCnt;
        }
    }
    size_t nIdx = 0;
    for (size_t i = 0; i < nCnt; ++i)
    {
        size_t nNextIdx = pSplitIdx[ i ];
        aBoxes[ nIdx ]->setRowSpan( nNextIdx - nIdx );
        lcl_InvalidateCellFrame( *aBoxes[ nIdx ] );
        while( ++nIdx < nNextIdx )
            aBoxes[ nIdx ]->setRowSpan( nIdx - nNextIdx );
    }
}

static void lcl_FillSelBoxes( SwSelBoxes &rBoxes, SwTableLine &rLine )
{
    const size_t nBoxCount = rLine.GetTabBoxes().size();
    for( size_t i = 0; i < nBoxCount; ++i )
        rBoxes.insert( rLine.GetTabBoxes()[i] );
}

void SwTable::InsertSpannedRow( SwDoc& rDoc, sal_uInt16 nRowIdx, sal_uInt16 nCnt )
{
    CHECK_TABLE( *this )
    OSL_ENSURE( nCnt && nRowIdx < GetTabLines().size(), "Wrong call of InsertSpannedRow" );
    SwSelBoxes aBoxes;
    SwTableLine& rLine = *GetTabLines()[ nRowIdx ];
    lcl_FillSelBoxes( aBoxes, rLine );
    SwFormatFrameSize aFSz( rLine.GetFrameFormat()->GetFrameSize() );
    if( SwFrameSize::Variable != aFSz.GetHeightSizeType() )
    {
        SwFrameFormat* pFrameFormat = rLine.ClaimFrameFormat();
        tools::Long nNewHeight = aFSz.GetHeight() / ( nCnt + 1 );
        if( !nNewHeight )
            ++nNewHeight;
        aFSz.SetHeight( nNewHeight );
        pFrameFormat->SetFormatAttr( aFSz );
    }
    InsertRow_( &rDoc, aBoxes, nCnt, true );
    const size_t nBoxCount = rLine.GetTabBoxes().size();
    for( sal_uInt16 n = 0; n < nCnt; ++n )
    {
        SwTableLine *pNewLine = GetTabLines()[ nRowIdx + nCnt - n ];
        for( size_t nCurrBox = 0; nCurrBox < nBoxCount; ++nCurrBox )
        {
            tools::Long nRowSpan = rLine.GetTabBoxes()[nCurrBox]->getRowSpan();
            if( nRowSpan > 0 )
                nRowSpan = - nRowSpan;
            pNewLine->GetTabBoxes()[ nCurrBox ]->setRowSpan( nRowSpan - n );
        }
    }
    lcl_ChangeRowSpan( *this, nCnt, nRowIdx, false );
    CHECK_TABLE( *this )
}

typedef std::pair< sal_uInt16, sal_uInt16 > SwLineOffset;
typedef std::vector< SwLineOffset > SwLineOffsetArray;

/*
* When a couple of table boxes has to be split,
* lcl_SophisticatedFillLineIndices delivers the information where and how many
* rows have to be inserted.
* Input
*     rTable: the table to manipulate
*     rBoxes: an array of boxes to split
*     nCnt:   how many parts are wanted
* Output
*     rArr:   a list of pairs ( line index, number of lines to insert )
*/
static void lcl_SophisticatedFillLineIndices( SwLineOffsetArray &rArr,
    const SwTable& rTable, const SwSelBoxes& rBoxes, sal_uInt16 nCnt )
{
    std::list< SwLineOffset > aBoxes;
    SwLineOffset aLnOfs( USHRT_MAX, USHRT_MAX );
    for (size_t i = 0; i < rBoxes.size(); ++i)
    {   // Collect all end line indices and the row spans
        const SwTableBox &rBox = rBoxes[ i ]->FindStartOfRowSpan( rTable );
        OSL_ENSURE( rBox.getRowSpan() > 0, "Didn't I say 'StartOfRowSpan' ??" );
        if( nCnt > rBox.getRowSpan() )
        {
            const SwTableLine *pLine = rBox.GetUpper();
            const sal_uInt16 nEnd = sal_uInt16( rBox.getRowSpan() +
                rTable.GetTabLines().GetPos(  pLine ) );
            // The next if statement is a small optimization
            if( aLnOfs.first != nEnd || aLnOfs.second != rBox.getRowSpan() )
            {
                aLnOfs.first = nEnd; // ok, this is the line behind the box
                aLnOfs.second = sal_uInt16( rBox.getRowSpan() ); // the row span
                aBoxes.insert( aBoxes.end(), aLnOfs );
            }
        }
    }
    // As I said, I noted the line index _behind_ the last line of the boxes
    // in the resulting array the index has to be _on_ the line
    // nSum is to evaluate the wished value
    sal_uInt16 nSum = 1;
    while( !aBoxes.empty() )
    {
        // I. step:
        // Looking for the "smallest" line end with the smallest row span
        std::list< SwLineOffset >::iterator pCurr = aBoxes.begin();
        aLnOfs = *pCurr; // the line end and row span of the first box
        while( ++pCurr != aBoxes.end() )
        {
            if( aLnOfs.first > pCurr->first )
            {   // Found a smaller line end
                aLnOfs.first = pCurr->first;
                aLnOfs.second = pCurr->second; // row span
            }
            else if( aLnOfs.first == pCurr->first &&
                     aLnOfs.second < pCurr->second )
                aLnOfs.second = pCurr->second; // Found a smaller row span
        }
        OSL_ENSURE( aLnOfs.second < nCnt, "Clean-up failed" );
        aLnOfs.second = nCnt - aLnOfs.second; // the number of rows to insert
        rArr.emplace_back( aLnOfs.first - nSum, aLnOfs.second );
        // the correction has to be incremented because in the following
        // loops the line ends were manipulated
        nSum = nSum + aLnOfs.second;

        pCurr = aBoxes.begin();
        while( pCurr != aBoxes.end() )
        {
            if( pCurr->first == aLnOfs.first )
            {   // These boxes can be removed because the last insertion
                // of rows will expand their row span above the needed value
                pCurr = aBoxes.erase(pCurr);
            }
            else
            {
                bool bBefore = ( pCurr->first - pCurr->second < aLnOfs.first );
                // Manipulation of the end line indices as if the rows are
                // already inserted
                pCurr->first = pCurr->first + aLnOfs.second;
                if( bBefore )
                {   // If the insertion is inside the box,
                    // its row span has to be incremented
                    pCurr->second = pCurr->second + aLnOfs.second;
                    if( pCurr->second >= nCnt )
                    {   // if the row span is bigger than the split factor
                        // this box is done
                        pCurr = aBoxes.erase(pCurr);
                    }
                    else
                        ++pCurr;
                }
                else
                    ++pCurr;
            }
        }
    }
}

typedef std::set< SwTwips > SwSplitLines;

static sal_uInt16 lcl_CalculateSplitLineHeights( SwSplitLines &rCurr, SwSplitLines &rNew,
    const SwTable& rTable, const SwSelBoxes& rBoxes, sal_uInt16 nCnt )
{
    if( nCnt < 2 )
        return 0;
    std::vector< SwLineOffset > aBoxes;
    SwLineOffset aLnOfs( USHRT_MAX, USHRT_MAX );
    sal_uInt16 nFirst = USHRT_MAX; // becomes the index of the first line
    sal_uInt16 nLast = 0; // becomes the index of the last line of the splitting
    for (size_t i = 0; i < rBoxes.size(); ++i)
    {   // Collect all pairs (start+end) of line indices to split
        const SwTableBox &rBox = rBoxes[ i ]->FindStartOfRowSpan( rTable );
        OSL_ENSURE( rBox.getRowSpan() > 0, "Didn't I say 'StartOfRowSpan' ??" );
        const SwTableLine *pLine = rBox.GetUpper();
        const sal_uInt16 nStart = rTable.GetTabLines().GetPos( pLine );
        const sal_uInt16 nEnd = sal_uInt16( rBox.getRowSpan() + nStart - 1 );
        // The next if statement is a small optimization
        if( aLnOfs.first != nStart || aLnOfs.second != nEnd )
        {
            aLnOfs.first = nStart;
            aLnOfs.second = nEnd;
            aBoxes.push_back( aLnOfs );
            if( nStart < nFirst )
                nFirst = nStart;
            if( nEnd > nLast )
                nLast = nEnd;
        }
    }

    if (nFirst == USHRT_MAX)
    {
        assert(aBoxes.empty());
        return 0;
    }

    SwTwips nHeight = 0;
    std::unique_ptr<SwTwips[]> pLines(new SwTwips[ nLast + 1 - nFirst ]);
    for( sal_uInt16 i = nFirst; i <= nLast; ++i )
    {
        bool bLayoutAvailable = false;
        nHeight += rTable.GetTabLines()[ i ]->GetTableLineHeight( bLayoutAvailable );
        rCurr.insert( rCurr.end(), nHeight );
        pLines[ i - nFirst ] = nHeight;
    }
    for( const auto& rSplit : aBoxes )
    {
        SwTwips nBase = rSplit.first <= nFirst ? 0 :
                        pLines[ rSplit.first - nFirst - 1 ];
        SwTwips nDiff = pLines[ rSplit.second - nFirst ] - nBase;
        for( sal_uInt16 i = 1; i < nCnt; ++i )
        {
            SwTwips nSplit = nBase + ( i * nDiff ) / nCnt;
            rNew.insert( nSplit );
        }
    }
    return nFirst;
}

static sal_uInt16 lcl_LineIndex( const SwTable& rTable, const SwSelBoxes& rBoxes,
                      bool bBehind )
{
    sal_uInt16 nDirect = USHRT_MAX;
    sal_uInt16 nSpan = USHRT_MAX;
    for (size_t i = 0; i < rBoxes.size(); ++i)
    {
        SwTableBox *pBox = rBoxes[i];
        const SwTableLine* pLine = rBoxes[i]->GetUpper();
        sal_uInt16 nPos = rTable.GetTabLines().GetPos( pLine );
        if( USHRT_MAX != nPos )
        {
            if( bBehind )
            {
                if( nPos > nDirect || nDirect == USHRT_MAX )
                    nDirect = nPos;
                tools::Long nRowSpan = pBox->getRowSpan();
                if( nRowSpan < 2 )
                    nSpan = 0;
                else if( nSpan )
                {
                    sal_uInt16 nEndOfRowSpan = static_cast<sal_uInt16>(nPos + nRowSpan - 1);
                    if( nEndOfRowSpan > nSpan || nSpan == USHRT_MAX )
                        nSpan = nEndOfRowSpan;
                }
            }
            else if( nPos < nDirect )
                nDirect = nPos;
        }
    }
    if( nSpan && nSpan < USHRT_MAX )
        return nSpan;
    return nDirect;
}

bool SwTable::NewSplitRow( SwDoc& rDoc, const SwSelBoxes& rBoxes, sal_uInt16 nCnt,
                           bool bSameHeight )
{
    CHECK_TABLE( *this )
    ++nCnt;
    FndBox_ aFndBox( nullptr, nullptr );
    aFndBox.SetTableLines( rBoxes, *this );

    if( bSameHeight && rDoc.getIDocumentLayoutAccess().GetCurrentViewShell() )
    {
        SwSplitLines aRowLines;
        SwSplitLines aSplitLines;
        sal_uInt16 nFirst = lcl_CalculateSplitLineHeights( aRowLines, aSplitLines,
            *this, rBoxes, nCnt );
        aFndBox.DelFrames( *this );
        SwTwips nLast = 0;
        SwSplitLines::iterator pSplit = aSplitLines.begin();
        for( const auto& rCurr : aRowLines )
        {
            while( pSplit != aSplitLines.end() && *pSplit < rCurr )
            {
                InsertSpannedRow( rDoc, nFirst, 1 );
                SwTableLine* pRow = GetTabLines()[ nFirst ];
                SwFrameFormat* pRowFormat = pRow->ClaimFrameFormat();
                SwFormatFrameSize aFSz( pRowFormat->GetFrameSize() );
                aFSz.SetHeightSizeType( SwFrameSize::Minimum );
                aFSz.SetHeight( *pSplit - nLast );
                pRowFormat->SetFormatAttr( aFSz );
                nLast = *pSplit;
                ++pSplit;
                ++nFirst;
            }
            if( pSplit != aSplitLines.end() && rCurr == *pSplit )
                ++pSplit;
            SwTableLine* pRow = GetTabLines()[ nFirst ];
            SwFrameFormat* pRowFormat = pRow->ClaimFrameFormat();
            SwFormatFrameSize aFSz( pRowFormat->GetFrameSize() );
            aFSz.SetHeightSizeType( SwFrameSize::Minimum );
            aFSz.SetHeight( rCurr - nLast );
            pRowFormat->SetFormatAttr( aFSz );
            nLast = rCurr;
            ++nFirst;
        }
    }
    else
    {
        aFndBox.DelFrames( *this );
        bSameHeight = false;
    }
    if( !bSameHeight )
    {
        SwLineOffsetArray aLineOffs;
        lcl_SophisticatedFillLineIndices( aLineOffs, *this, rBoxes, nCnt );
        SwLineOffsetArray::reverse_iterator pCurr( aLineOffs.rbegin() );
        while( pCurr != aLineOffs.rend() )
        {
            InsertSpannedRow( rDoc, pCurr->first, pCurr->second );
            ++pCurr;
        }
    }

    std::set<size_t> aIndices;
    for (size_t i = 0; i < rBoxes.size(); ++i)
    {
        OSL_ENSURE( rBoxes[i]->getRowSpan() != 1, "Forgot to split?" );
        if( rBoxes[i]->getRowSpan() > 1 )
            aIndices.insert( i );
    }

    for( const auto& rCurrBox : aIndices )
        lcl_UnMerge( *this, *rBoxes[rCurrBox], nCnt, bSameHeight );

    CHECK_TABLE( *this )
    // update the layout
    aFndBox.MakeFrames( *this );

    return true;
}

bool SwTable::InsertRow( SwDoc* pDoc, const SwSelBoxes& rBoxes,
                        sal_uInt16 nCnt, bool bBehind )
{
    bool bRet = false;
    if( IsNewModel() )
    {
        CHECK_TABLE( *this )
        sal_uInt16 nRowIdx = lcl_LineIndex( *this, rBoxes, bBehind );
        if( nRowIdx < USHRT_MAX )
        {
            FndBox_ aFndBox( nullptr, nullptr );
            aFndBox.SetTableLines( rBoxes, *this );
            aFndBox.DelFrames( *this );

            bRet = true;
            SwTableLine *pLine = GetTabLines()[ nRowIdx ];
            SwSelBoxes aLineBoxes;
            lcl_FillSelBoxes( aLineBoxes, *pLine );
            InsertRow_( pDoc, aLineBoxes, nCnt, bBehind );
            const size_t nBoxCount = pLine->GetTabBoxes().size();
            sal_uInt16 nOfs = bBehind ? 0 : 1;
            for( sal_uInt16 n = 0; n < nCnt; ++n )
            {
                SwTableLine *pNewLine = GetTabLines()[ nRowIdx+nCnt-n-nOfs];
                for( size_t nCurrBox = 0; nCurrBox < nBoxCount; ++nCurrBox )
                {
                    tools::Long nRowSpan = pLine->GetTabBoxes()[nCurrBox]->getRowSpan();
                    if( bBehind )
                    {
                        if( nRowSpan == 1 || nRowSpan == -1 )
                            nRowSpan = n + 1;
                        else if( nRowSpan > 1 )
                        {
                            nRowSpan = - nRowSpan;

                            // tdf#123102 disable numbering of the new hidden
                            // paragraph in merged cells to avoid of bad
                            // renumbering of next list elements
                            SwTableBox* pBox = pNewLine->GetTabBoxes()[nCurrBox];
                            SwNodeIndex aIdx( *pBox->GetSttNd(), +1 );
                            SwContentNode* pCNd = aIdx.GetNode().GetContentNode();
                            if( pCNd && pCNd->IsTextNode() && pCNd->GetTextNode()->GetNumRule() )
                            {
                                SwPosition aPos( *pCNd->GetTextNode() );
                                SwPaM aPam( aPos, aPos );
                                pDoc->DelNumRules( aPam );
                            }
                        }
                    }
                    else
                    {
                        if( nRowSpan > 0 )
                            nRowSpan = n + 1;
                        else
                            --nRowSpan;
                    }
                    pNewLine->GetTabBoxes()[ nCurrBox ]->setRowSpan( nRowSpan - n );
                }
            }
            if( bBehind )
                ++nRowIdx;
            if( nRowIdx )
                lcl_ChangeRowSpan( *this, nCnt, --nRowIdx, true );
            // update the layout
            aFndBox.MakeFrames( *this );
        }
        CHECK_TABLE( *this )
    }
    else
        bRet = InsertRow_( pDoc, rBoxes, nCnt, bBehind );
    return bRet;
}

void SwTable::PrepareDelBoxes( const SwSelBoxes& rBoxes )
{
    if( !IsNewModel() )
        return;

    for (size_t i = 0; i < rBoxes.size(); ++i)
    {
        SwTableBox* pBox = rBoxes[i];
        tools::Long nRowSpan = pBox->getRowSpan();
        if( nRowSpan != 1 && pBox->GetFrameFormat()->GetFrameSize().GetWidth() )
        {
            tools::Long nLeft = lcl_Box2LeftBorder( *pBox );
            SwTableLine *pLine = pBox->GetUpper();
            sal_uInt16 nLinePos = GetTabLines().GetPos( pLine);
            OSL_ENSURE( nLinePos < USHRT_MAX, "Box/table mismatch" );
            if( nRowSpan > 1 )
            {
                if( ++nLinePos < GetTabLines().size() )
                {
                    pLine = GetTabLines()[ nLinePos ];
                    pBox = lcl_LeftBorder2Box( nLeft, pLine );
                    OSL_ENSURE( pBox, "RowSpan irritation I" );
                    if( pBox )
                        pBox->setRowSpan( --nRowSpan );
                }
            }
            else if( nLinePos > 0 )
            {
                do
                {
                    pLine = GetTabLines()[ --nLinePos ];
                    pBox = lcl_LeftBorder2Box( nLeft, pLine );
                    OSL_ENSURE( pBox, "RowSpan irritation II" );
                    if( pBox )
                    {
                        nRowSpan = pBox->getRowSpan();
                        if( nRowSpan > 1 )
                        {
                            lcl_InvalidateCellFrame( *pBox );
                            --nRowSpan;
                        }
                        else
                            ++nRowSpan;
                        pBox->setRowSpan( nRowSpan );
                    }
                    else
                        nRowSpan = 1;
                }
                while( nRowSpan < 0 && nLinePos > 0 );
            }
        }
    }
}

static void lcl_SearchSelBox( const SwTable &rTable, SwSelBoxes& rBoxes, tools::Long nMin, tools::Long nMax,
                       SwTableLine& rLine, bool bChkProtected, bool bColumn )
{
    tools::Long nLeft = 0;
    tools::Long nRight = 0;
    tools::Long nMid = ( nMax + nMin )/ 2;
    const size_t nCount = rLine.GetTabBoxes().size();
    for( size_t nCurrBox = 0; nCurrBox < nCount; ++nCurrBox )
    {
        SwTableBox* pBox = rLine.GetTabBoxes()[nCurrBox];
        OSL_ENSURE( pBox, "Missing table box" );
        tools::Long nWidth = pBox->GetFrameFormat()->GetFrameSize().GetWidth();
        nRight += nWidth;
        if( nRight > nMin )
        {
            bool bAdd = false;
            if( nRight <= nMax )
                bAdd = nLeft >= nMin || nRight >= nMid ||
                       nRight - nMin > nMin - nLeft;
            else
                bAdd = nLeft <= nMid || nRight - nMax < nMax - nLeft;
            tools::Long nRowSpan = pBox->getRowSpan();
            if( bAdd &&
                ( !bChkProtected ||
                !pBox->GetFrameFormat()->GetProtect().IsContentProtected() ) )
            {
                size_t const nOldCnt = rBoxes.size();
                rBoxes.insert( pBox );
                if( bColumn && nRowSpan != 1 && nOldCnt < rBoxes.size() )
                {
                    SwTableBox *pMasterBox = pBox->getRowSpan() > 0 ? pBox
                        : &pBox->FindStartOfRowSpan( rTable );
                    lcl_getAllMergedBoxes( rTable, rBoxes, *pMasterBox );
                }
            }
        }
        if( nRight >= nMax )
            break;
        nLeft = nRight;
    }
}

void SwTable::CreateSelection(  const SwPaM& rPam, SwSelBoxes& rBoxes,
    const SearchType eSearch, bool bChkProtected ) const
{
    OSL_ENSURE( m_bNewModel, "Don't call me for old tables" );
    if( m_aLines.empty() )
        return;
    const SwNode* pStartNd = rPam.GetPoint()->nNode.GetNode().FindTableBoxStartNode();
    const SwNode* pEndNd = rPam.GetMark()->nNode.GetNode().FindTableBoxStartNode();
    if( !pStartNd || !pEndNd )
        return;
    CreateSelection( pStartNd, pEndNd, rBoxes, eSearch, bChkProtected );
}

void SwTable::CreateSelection( const SwNode* pStartNd, const SwNode* pEndNd,
    SwSelBoxes& rBoxes, const SearchType eSearch, bool bChkProtected ) const
{
    rBoxes.clear();
    // Looking for start and end of the selection given by SwNode-pointer
    const size_t nLines = m_aLines.size();
    // nTop becomes the line number of the upper box
    // nBottom becomes the line number of the lower box
    size_t nTop = 0;
    size_t nBottom = 0;
    // nUpperMin becomes the left border value of the upper box
    // nUpperMax becomes the right border of the upper box
    // nLowerMin and nLowerMax the borders of the lower box
    tools::Long nUpperMin = 0, nUpperMax = 0;
    tools::Long nLowerMin = 0, nLowerMax = 0;
    // nFound will incremented if a box is found
    // 0 => no box found; 1 => the upper box has been found; 2 => both found
    int nFound = 0;
    for( size_t nRow = 0; nFound < 2 && nRow < nLines; ++nRow )
    {
        SwTableLine* pLine = m_aLines[nRow];
        OSL_ENSURE( pLine, "Missing table line" );
        const size_t nCols = pLine->GetTabBoxes().size();
        for( size_t nCol = 0; nCol < nCols; ++nCol )
        {
            SwTableBox* pBox = pLine->GetTabBoxes()[nCol];
            OSL_ENSURE( pBox, "Missing table box" );
            if( pBox->GetSttNd() == pEndNd || pBox->GetSttNd() == pStartNd )
            {
                if( !bChkProtected ||
                    !pBox->GetFrameFormat()->GetProtect().IsContentProtected() )
                    rBoxes.insert( pBox );
                if( nFound )
                {
                    nBottom = nRow;
                    lcl_CheckMinMax( nLowerMin, nLowerMax, *pLine, nCol, true );
                    ++nFound;
                    break;
                }
                else
                {
                    nTop = nRow;
                    lcl_CheckMinMax( nUpperMin, nUpperMax, *pLine, nCol, true );
                    ++nFound;
                     // If start and end node are identical, we're nearly done...
                    if( pEndNd == pStartNd )
                    {
                        nBottom = nTop;
                        nLowerMin = nUpperMin;
                        nLowerMax = nUpperMax;
                        ++nFound;
                    }
                }
            }
        }
    }
    if( nFound < 2 )
        return; // At least one node was not a part of the given table
    if( eSearch == SEARCH_ROW )
    {
        // Selection of a row is quiet easy:
        // every (unprotected) box between start and end line
        // with a positive row span will be collected
        for( size_t nRow = nTop; nRow <= nBottom; ++nRow )
        {
            SwTableLine* pLine = m_aLines[nRow];
            OSL_ENSURE( pLine, "Missing table line" );
            const size_t nCount = pLine->GetTabBoxes().size();
            for( size_t nCurrBox = 0; nCurrBox < nCount; ++nCurrBox )
            {
                SwTableBox* pBox = pLine->GetTabBoxes()[nCurrBox];
                OSL_ENSURE( pBox, "Missing table box" );
                if( pBox->getRowSpan() > 0 && ( !bChkProtected ||
                    !pBox->GetFrameFormat()->GetProtect().IsContentProtected() ) )
                    rBoxes.insert( pBox );
            }
        }
        return;
    }
    bool bCombine = nTop == nBottom;
    if( !bCombine )
    {
        tools::Long nMinWidth = nUpperMax - nUpperMin;
        tools::Long nTmp = nLowerMax - nLowerMin;
        if( nMinWidth > nTmp )
            nMinWidth = nTmp;
        nTmp = std::min(nLowerMax, nUpperMax);
        nTmp -= ( nLowerMin < nUpperMin ) ? nUpperMin : nLowerMin;
        // If the overlapping between upper and lower box is less than half
        // of the width (of the smaller cell), bCombine is set,
        // e.g. if upper and lower cell are in different columns
        bCombine = ( nTmp + nTmp < nMinWidth );
    }
    if( bCombine )
    {
        if( nUpperMin < nLowerMin )
            nLowerMin = nUpperMin;
        else
            nUpperMin = nLowerMin;
        if( nUpperMax > nLowerMax )
            nLowerMax = nUpperMax;
        else
            nUpperMax = nLowerMax;
    }
    const bool bColumn = eSearch == SEARCH_COL;
    if( bColumn )
    {
        for( size_t i = 0; i < nTop; ++i )
            lcl_SearchSelBox( *this, rBoxes, nUpperMin, nUpperMax,
                              *m_aLines[i], bChkProtected, bColumn );
    }

    {
        tools::Long nMin = std::min(nUpperMin, nLowerMin);
        tools::Long nMax = nUpperMax < nLowerMax ? nLowerMax : nUpperMax;
        for( size_t i = nTop; i <= nBottom; ++i )
            lcl_SearchSelBox( *this, rBoxes, nMin, nMax, *m_aLines[i],
                              bChkProtected, bColumn );
    }
    if( bColumn )
    {
        for( size_t i = nBottom + 1; i < nLines; ++i )
            lcl_SearchSelBox( *this, rBoxes, nLowerMin, nLowerMax, *m_aLines[i],
                              bChkProtected, true );
    }
}

void SwTable::ExpandColumnSelection( SwSelBoxes& rBoxes, tools::Long &rMin, tools::Long &rMax ) const
{
    OSL_ENSURE( m_bNewModel, "Don't call me for old tables" );
    rMin = 0;
    rMax = 0;
    if( m_aLines.empty() || rBoxes.empty() )
        return;

    const size_t nLineCnt = m_aLines.size();
    const size_t nBoxCnt = rBoxes.size();
    size_t nBox = 0;
    for( size_t nRow = 0; nRow < nLineCnt && nBox < nBoxCnt; ++nRow )
    {
        SwTableLine* pLine = m_aLines[nRow];
        OSL_ENSURE( pLine, "Missing table line" );
        const size_t nCols = pLine->GetTabBoxes().size();
        for( size_t nCol = 0; nCol < nCols; ++nCol )
        {
            SwTableBox* pBox = pLine->GetTabBoxes()[nCol];
            OSL_ENSURE( pBox, "Missing table box" );
            if( pBox == rBoxes[nBox] )
            {
                lcl_CheckMinMax( rMin, rMax, *pLine, nCol, nBox == 0 );
                if( ++nBox >= nBoxCnt )
                    break;
            }
        }
    }
    for( size_t nRow = 0; nRow < nLineCnt; ++nRow )
    {
        SwTableLine* pLine = m_aLines[nRow];
        const size_t nCols = pLine->GetTabBoxes().size();
        tools::Long nRight = 0;
        for( size_t nCurrBox = 0; nCurrBox < nCols; ++nCurrBox )
        {
            tools::Long nLeft = nRight;
            SwTableBox* pBox = pLine->GetTabBoxes()[nCurrBox];
            nRight += pBox->GetFrameFormat()->GetFrameSize().GetWidth();
            if( nLeft >= rMin && nRight <= rMax )
                rBoxes.insert( pBox );
        }
    }
}

void SwTable::PrepareDeleteCol( tools::Long nMin, tools::Long nMax )
{
    OSL_ENSURE( m_bNewModel, "Don't call me for old tables" );
    if( m_aLines.empty() || nMax < nMin )
        return;
    tools::Long nMid = nMin ? ( nMin + nMax ) / 2 : 0;
    const SwTwips nTabSize = GetFrameFormat()->GetFrameSize().GetWidth();
    if( nTabSize == nMax )
        nMid = nMax;
    const size_t nLineCnt = m_aLines.size();
    for( size_t nRow = 0; nRow < nLineCnt; ++nRow )
    {
        SwTableLine* pLine = m_aLines[nRow];
        const size_t nCols = pLine->GetTabBoxes().size();
        tools::Long nRight = 0;
        for( size_t nCurrBox = 0; nCurrBox < nCols; ++nCurrBox )
        {
            tools::Long nLeft = nRight;
            SwTableBox* pBox = pLine->GetTabBoxes()[nCurrBox];
            nRight += pBox->GetFrameFormat()->GetFrameSize().GetWidth();
            if( nRight < nMin )
                continue;
            if( nLeft > nMax )
                break;
            tools::Long nNewWidth = -1;
            if( nLeft < nMin )
            {
                if( nRight <= nMax )
                    nNewWidth = nMid - nLeft;
            }
            else if( nRight > nMax )
                nNewWidth = nRight - nMid;
            else
                nNewWidth = 0;
            if( nNewWidth >= 0 )
            {
                SwFrameFormat* pFrameFormat = pBox->ClaimFrameFormat();
                SwFormatFrameSize aFrameSz( pFrameFormat->GetFrameSize() );
                aFrameSz.SetWidth( nNewWidth );
                pFrameFormat->SetFormatAttr( aFrameSz );
            }
        }
    }
}

void SwTable::ExpandSelection( SwSelBoxes& rBoxes ) const
{
    for (size_t i = 0; i < rBoxes.size(); ++i)
    {
        SwTableBox *pBox = rBoxes[i];
        tools::Long nRowSpan = pBox->getRowSpan();
        if( nRowSpan != 1 )
        {
            SwTableBox *pMasterBox = nRowSpan > 0 ? pBox
                    : &pBox->FindStartOfRowSpan( *this );
            lcl_getAllMergedBoxes( *this, rBoxes, *pMasterBox );
        }
    }
}

void SwTable::CheckRowSpan( SwTableLine* &rpLine, bool bUp ) const
{
    OSL_ENSURE( IsNewModel(), "Don't call me for old tables" );
    sal_uInt16 nLineIdx = GetTabLines().GetPos( rpLine );
    OSL_ENSURE( nLineIdx < GetTabLines().size(), "Start line out of range" );
    bool bChange = true;
    if( bUp )
    {
        while( bChange )
        {
            bChange = false;
            rpLine = GetTabLines()[ nLineIdx ];
            const size_t nCols = rpLine->GetTabBoxes().size();
            for( size_t nCol = 0; !bChange && nCol < nCols; ++nCol )
            {
                SwTableBox* pBox = rpLine->GetTabBoxes()[nCol];
                if( pBox->getRowSpan() > 1 || pBox->getRowSpan() < -1 )
                    bChange = true;
            }
            if( bChange )
            {
                if( nLineIdx )
                    --nLineIdx;
                else
                {
                    bChange = false;
                    rpLine = nullptr;
                }
            }
        }
    }
    else
    {
        const size_t nMaxLine = GetTabLines().size();
        while( bChange )
        {
            bChange = false;
            rpLine = GetTabLines()[ nLineIdx ];
            const size_t nCols = rpLine->GetTabBoxes().size();
            for( size_t nCol = 0; !bChange && nCol < nCols; ++nCol )
            {
                SwTableBox* pBox = rpLine->GetTabBoxes()[nCol];
                if( pBox->getRowSpan() < 0 )
                    bChange = true;
            }
            if( bChange )
            {
                ++nLineIdx;
                if( nLineIdx >= nMaxLine )
                {
                    bChange = false;
                    rpLine = nullptr;
                }
            }
        }
    }
}

// This structure corrects the row span attributes for a top line of a table
// In a top line no negative row span is allowed, so these have to be corrected.
// If there has been at least one correction, all values are stored
// and can be used by undo of table split
SwSaveRowSpan::SwSaveRowSpan( SwTableBoxes& rBoxes, sal_uInt16 nSplitLn )
    : mnSplitLine( nSplitLn )
{
    bool bDontSave = true; // nothing changed, nothing to save
    const size_t nColCount = rBoxes.size();
    OSL_ENSURE( nColCount, "Empty Table Line" );
    mnRowSpans.resize( nColCount );
    for( size_t nCurrCol = 0; nCurrCol < nColCount; ++nCurrCol )
    {
        SwTableBox* pBox = rBoxes[nCurrCol];
        OSL_ENSURE( pBox, "Missing Table Box" );
        tools::Long nRowSp = pBox->getRowSpan();
        mnRowSpans[ nCurrCol ] = nRowSp;
        if( nRowSp < 0 )
        {
            bDontSave = false;
            nRowSp = -nRowSp;
            pBox->setRowSpan( nRowSp ); // correction needed
        }
    }
    if( bDontSave )
        mnRowSpans.clear();
}

// This function is called by undo of table split to restore the old row span
// values at the split line
void SwTable::RestoreRowSpan( const SwSaveRowSpan& rSave )
{
    if( !IsNewModel() ) // for new model only
        return;
    sal_uInt16 nLineCount = GetTabLines().size();
    OSL_ENSURE( rSave.mnSplitLine < nLineCount, "Restore behind last line?" );
    if( rSave.mnSplitLine >= nLineCount )
        return;

    SwTableLine* pLine = GetTabLines()[rSave.mnSplitLine];
    const size_t nColCount = pLine->GetTabBoxes().size();
    OSL_ENSURE( nColCount, "Empty Table Line" );
    OSL_ENSURE( nColCount == rSave.mnRowSpans.size(), "Wrong row span store" );
    if( nColCount != rSave.mnRowSpans.size() )
        return;

    for( size_t nCurrCol = 0; nCurrCol < nColCount; ++nCurrCol )
    {
        SwTableBox* pBox = pLine->GetTabBoxes()[nCurrCol];
        OSL_ENSURE( pBox, "Missing Table Box" );
        tools::Long nRowSp = pBox->getRowSpan();
        if( nRowSp != rSave.mnRowSpans[ nCurrCol ] )
        {
            OSL_ENSURE( -nRowSp == rSave.mnRowSpans[ nCurrCol ], "Pardon me?!" );
            OSL_ENSURE( rSave.mnRowSpans[ nCurrCol ] < 0, "Pardon me?!" );
            pBox->setRowSpan( -nRowSp );

            sal_uInt16 nLine = rSave.mnSplitLine;
            if( nLine )
            {
                tools::Long nLeftBorder = lcl_Box2LeftBorder( *pBox );
                SwTableBox* pNext;
                do
                {
                    pNext = lcl_LeftBorder2Box( nLeftBorder, GetTabLines()[--nLine] );
                    if( pNext )
                    {
                        pBox = pNext;
                        tools::Long nNewSpan = pBox->getRowSpan();
                        if( pBox->getRowSpan() < 1 )
                            nNewSpan -= nRowSp;
                        else
                        {
                            nNewSpan += nRowSp;
                            pNext = nullptr;
                        }
                        pBox->setRowSpan( nNewSpan );
                    }
                } while( nLine && pNext );
            }
        }
    }
}

std::unique_ptr<SwSaveRowSpan> SwTable::CleanUpTopRowSpan( sal_uInt16 nSplitLine )
{
    if( !IsNewModel() )
        return nullptr;
    std::unique_ptr<SwSaveRowSpan> pRet(new SwSaveRowSpan( GetTabLines()[0]->GetTabBoxes(), nSplitLine ));
    if( pRet->mnRowSpans.empty() )
        return nullptr;
    return pRet;
}

void SwTable::CleanUpBottomRowSpan( sal_uInt16 nDelLines )
{
    if( !IsNewModel() )
        return;
    const size_t nLastLine = GetTabLines().size()-1;
    SwTableLine* pLine = GetTabLines()[nLastLine];
    const size_t nColCount = pLine->GetTabBoxes().size();
    OSL_ENSURE( nColCount, "Empty Table Line" );
    for( size_t nCurrCol = 0; nCurrCol < nColCount; ++nCurrCol )
    {
        SwTableBox* pBox = pLine->GetTabBoxes()[nCurrCol];
        OSL_ENSURE( pBox, "Missing Table Box" );
        tools::Long nRowSp = pBox->getRowSpan();
        if( nRowSp < 0 )
            nRowSp = -nRowSp;
        if( nRowSp > 1 )
        {
            lcl_ChangeRowSpan( *this, -static_cast<tools::Long>(nDelLines),
                               static_cast<sal_uInt16>(nLastLine), false );
            break;
        }
    }
}

void SwTable::ConvertSubtableBox(sal_uInt16 const nRow, sal_uInt16 const nBox)
{
    SwDoc *const pDoc(GetFrameFormat()->GetDoc());
    SwTableLine *const pSourceLine(GetTabLines()[nRow]);
    SwTableBox *const pSubTableBox(pSourceLine->GetTabBoxes()[nBox]);
    assert(!pSubTableBox->GetTabLines().empty());
    // are relative (%) heights possible? apparently not
    SwFormatFrameSize const outerSize(pSourceLine->GetFrameFormat()->GetFrameSize());
    tools::Long minHeights(0);
    {
        SwFormatFrameSize const* pSize(nullptr);
        SwFrameFormat const& rSubLineFormat(*pSubTableBox->GetTabLines()[0]->GetFrameFormat());
        if (rSubLineFormat.GetItemState(RES_FRM_SIZE, true,
            reinterpret_cast<SfxPoolItem const**>(&pSize)) == SfxItemState::SET)
        {   // for first row, apply height from inner row to outer row.
            // in case the existing outer row height was larger than the entire
            // subtable, the last inserted row needs to be tweaked (below)
            pSourceLine->GetFrameFormat()->SetFormatAttr(*pSize);
            if (pSize->GetHeightSizeType() != SwFrameSize::Variable)
            {
                minHeights += pSize->GetHeight();
            }
        }
    }
    for (size_t i = 1; i < pSubTableBox->GetTabLines().size(); ++i)
    {
        SwTableLine *const pSubLine(pSubTableBox->GetTabLines()[i]);
        SwTableLine *const pNewLine = new SwTableLine(
            static_cast<SwTableLineFormat*>(pSourceLine->GetFrameFormat()),
            pSourceLine->GetTabBoxes().size() - 1 + pSubLine->GetTabBoxes().size(),
            nullptr);
        SwFrameFormat const& rSubLineFormat(*pSubLine->GetFrameFormat());
        SwFormatFrameSize const* pSize(nullptr);
        if (rSubLineFormat.GetItemState(RES_FRM_SIZE, true,
            reinterpret_cast<SfxPoolItem const**>(&pSize)) == SfxItemState::SET)
        {   // for rows 2..N, copy inner row height to outer row
            pNewLine->ClaimFrameFormat();
            pNewLine->GetFrameFormat()->SetFormatAttr(*pSize);
            if (pSize->GetHeightSizeType() != SwFrameSize::Variable)
            {
                minHeights += pSize->GetHeight();
            }
        }
        // ensure the sum of the lines is at least as high as the outer line was
        if (i == pSubTableBox->GetTabLines().size() - 1
            && outerSize.GetHeightSizeType() != SwFrameSize::Variable
            && minHeights < outerSize.GetHeight())
        {
            SwFormatFrameSize lastSize(pNewLine->GetFrameFormat()->GetFrameSize());
            lastSize.SetHeight(lastSize.GetHeight() + outerSize.GetHeight() - minHeights);
            if (lastSize.GetHeightSizeType() == SwFrameSize::Variable)
            {
                lastSize.SetHeightSizeType(SwFrameSize::Minimum);
            }
            pNewLine->GetFrameFormat()->SetFormatAttr(lastSize);
        }
        SfxPoolItem const* pRowBrush(nullptr);
        (void)rSubLineFormat.GetItemState(RES_BACKGROUND, true, &pRowBrush);
        GetTabLines().insert(GetTabLines().begin() + nRow + i, pNewLine);
        for (size_t j = 0; j < pSourceLine->GetTabBoxes().size(); ++j)
        {
            if (j == nBox)
            {
                for (size_t k = 0; k < pSubLine->GetTabBoxes().size(); ++k)
                {
                    // move box k to new outer row
                    SwTableBox *const pSourceBox(pSubLine->GetTabBoxes()[k]);
                    assert(pSourceBox->getRowSpan() == 1);
                    // import filter (xmltbli.cxx) converts all box widths to absolute
                    assert(pSourceBox->GetFrameFormat()->GetFrameSize().GetWidthPercent() == 0);
                    ::InsTableBox(*pDoc, GetTableNode(), pNewLine,
                        static_cast<SwTableBoxFormat*>(pSourceBox->GetFrameFormat()),
                        pSourceBox, j+k, 1);
                    // insert dummy text node...
                    pDoc->GetNodes().MakeTextNode(
                            SwNodeIndex(*pSourceBox->GetSttNd(), +1),
                            pDoc->GetDfltTextFormatColl());
                    SwNodeRange content(*pSourceBox->GetSttNd(), +2,
                            *pSourceBox->GetSttNd()->EndOfSectionNode());
                    SwTableBox *const pNewBox(pNewLine->GetTabBoxes()[j+k]);
                    SwNodeIndex insPos(*pNewBox->GetSttNd(), 1);
                    // MoveNodes would delete the box SwStartNode/SwEndNode
                    // without the dummy node
#if 0
                    pDoc->GetNodes().MoveNodes(content, pDoc->GetNodes(), insPos, false);
#else
                    pDoc->getIDocumentContentOperations().MoveNodeRange(content, insPos, SwMoveFlags::NO_DELFRMS|SwMoveFlags::REDLINES);
#endif
                    // delete the empty node that was bundled in the new box
                    pDoc->GetNodes().Delete(insPos);
                    if (pRowBrush)
                    {
                        SfxPoolItem const* pCellBrush(nullptr);
                        if (pNewBox->GetFrameFormat()->GetItemState(RES_BACKGROUND, true, &pCellBrush) != SfxItemState::SET)
                        {   // set inner row background on inner cell
                            pNewBox->ClaimFrameFormat();
                            pNewBox->GetFrameFormat()->SetFormatAttr(*pRowBrush);
                        }
                    }
                    // assume that the borders can be left as they are, because
                    // lines don't have borders, only boxes do
                }
            }
            else
            {
                // insert covered cell for box j
                SwTableBox *const pSourceBox(pSourceLine->GetTabBoxes()[j]);
                assert(pSourceBox->GetTabLines().empty()); // checked for that
                sal_uInt16 const nInsPos(j < nBox ? j : j + pSubLine->GetTabBoxes().size() - 1);
                ::InsTableBox(*pDoc, GetTableNode(), pNewLine,
                    static_cast<SwTableBoxFormat*>(pSourceBox->GetFrameFormat()),
                    pSourceBox, nInsPos, 1);
                // adjust row span:
                // N rows in subtable, N-1 rows inserted:
                // -1 -> -N ; -(N-1) ... -1
                // -2 -> -(N+1) ; -N .. -2
                //  1 -> N ; -(N-1) .. -1
                //  2 -> N+1 ; -N .. -2
                tools::Long newSourceRowSpan(pSourceBox->getRowSpan());
                tools::Long newBoxRowSpan;
                if (newSourceRowSpan < 0)
                {
                    newSourceRowSpan -= pSubTableBox->GetTabLines().size() - 1;
                    newBoxRowSpan = newSourceRowSpan + i;
                }
                else
                {
                    newSourceRowSpan += pSubTableBox->GetTabLines().size() - 1;
                    newBoxRowSpan = -(newSourceRowSpan - sal::static_int_cast<long>(i));
                }
                pNewLine->GetTabBoxes()[nInsPos]->setRowSpan(newBoxRowSpan);
                if (i == pSubTableBox->GetTabLines().size() - 1)
                {   // only last iteration
                    pSourceBox->setRowSpan(newSourceRowSpan);
                }
            }
        }
    }
    // delete inner rows 2..N
    while (1 < pSubTableBox->GetTabLines().size())
    {
        // careful: the last box deletes pSubLine!
        SwTableLine *const pSubLine(pSubTableBox->GetTabLines()[1]);
        for (size_t j = pSubLine->GetTabBoxes().size(); 0 < j; --j)
        {
            SwTableBox *const pBox(pSubLine->GetTabBoxes()[0]);
            DeleteBox_(*this, pBox, nullptr, false, false, nullptr);
        }
    }
    // fix row spans in lines preceding nRow
    lcl_ChangeRowSpan(*this, pSubTableBox->GetTabLines().size() - 1, nRow - 1, false);
    // note: the first line of the inner table remains; caller will call
    //       GCLines() to remove it
}

bool SwTable::CanConvertSubtables() const
{
    for (SwTableLine const*const pLine : GetTabLines())
    {
        bool haveSubtable(false);
        for (SwTableBox const*const pBox : pLine->GetTabBoxes())
        {
            if (pBox->IsFormulaOrValueBox() == RES_BOXATR_FORMULA)
            {
                return false; // no table box formulas yet
            }
            if (!pBox->GetTabLines().empty())
            {
                if (haveSubtable)
                {   // can't handle 2 subtable in a row yet
                    return false;
                }
                haveSubtable = true;
                for (SwTableLine const*const pInnerLine : pBox->GetTabLines())
                {
                    // bitmap row background will look different
                    SwFrameFormat const& rRowFormat(*pInnerLine->GetFrameFormat());
                    std::unique_ptr<SvxBrushItem> pBrush(rRowFormat.makeBackgroundBrushItem());
                    assert(pBrush);
                    if (pBrush->GetGraphicObject() != nullptr)
                    {
                        /* TODO: all cells could override this?
                        for (SwTableBox & rInnerBox : rInnerLine.GetTabBoxes())
                        */
                        if (1 < pInnerLine->GetTabBoxes().size()) // except if only 1 cell?
                        {
                            return false;
                        }
                    }
                    for (SwTableBox const*const pInnerBox : pInnerLine->GetTabBoxes())
                    {
                        if (!pInnerBox->GetTabLines().empty())
                        {
                            return false; // nested subtable :(
                        }
                    }
                }
            }
        }
    }
    // note: fields that refer to table cells may be *outside* the table,
    // so the entire document needs to be imported before checking here
    // (same for table box formulas and charts)
    SwDoc *const pDoc(GetFrameFormat()->GetDoc());
    SwFieldType const*const pTableFields(
        pDoc->getIDocumentFieldsAccess().GetFieldType(SwFieldIds::Table, "", false));
    std::vector<SwFormatField*> vFields;
    pTableFields->GatherFields(vFields);
    if (!vFields.empty())
    {
        return false; // no formulas in fields yet
    }
    if (pDoc->GetAttrPool().GetItemCount2(RES_BOXATR_FORMULA) != 0)
    {
        return false; // no table box formulas yet
    }
    OUString const tableName(GetFrameFormat()->GetName());
    SwNodeIndex temp(*pDoc->GetNodes().GetEndOfAutotext().StartOfSectionNode(), +1);
    while (SwStartNode const*const pStartNode = temp.GetNode().GetStartNode())
    {
        ++temp;
        SwOLENode const*const pOLENode(temp.GetNode().GetOLENode());
        if (pOLENode && tableName == pOLENode->GetChartTableName())
        {   // there are charts that refer to this table
            // presumably such charts would need to be adapted somehow?
            return  false;
        }
        temp.Assign(*pStartNode->EndOfSectionNode(), +1);
    }
    return true;
}

void SwTable::ConvertSubtables()
{
    for (size_t i = 0; i < GetTabLines().size(); ++i)
    {
        SwTableLine *const pLine(GetTabLines()[i]);
        for (size_t j = 0; j < pLine->GetTabBoxes().size(); ++j)
        {
            SwTableBox *const pBox(pLine->GetTabBoxes()[j]);
            SwTableLines & rInnerLines(pBox->GetTabLines());
            if (!rInnerLines.empty())
            {
                ConvertSubtableBox(i, j);
            }
        }
    }
    GCLines();
    m_bNewModel = true;
#if 0
    // note: outline nodes (and ordinary lists) are sorted by MoveNodes() itself
    //       (this could change order inside table of contents, but that's a
    //       really esoteric use-case)
    // nodes were moved - sort marks, redlines, footnotes
    SwDoc *const pDoc(GetFrameFormat()->GetDoc());
    pDoc->getIDocumentMarkAccess()->assureSortedMarkContainers();
    pDoc->getIDocumentRedlineAccess().GetRedlineTable().Resort();
    pDoc->GetFootnoteIdxs().UpdateAllFootnote();
#endif
    // assume that there aren't any node indexes to the deleted box start/end nodes
    CHECK_TABLE( *this )
}

#ifdef DBG_UTIL

namespace {

struct RowSpanCheck
{
    tools::Long nRowSpan;
    SwTwips nLeft;
    SwTwips nRight;
};

}

void SwTable::CheckConsistency() const
{
    if( !IsNewModel() )
        return;
    const size_t nLineCount = GetTabLines().size();
    const SwTwips nTabSize = GetFrameFormat()->GetFrameSize().GetWidth();
    SwTwips nLineWidth = 0;
    std::list< RowSpanCheck > aRowSpanCells;
    std::list< RowSpanCheck >::iterator aIter = aRowSpanCells.end();
    SwNodeIndex index(*GetTableNode());
    ++index;
    for( size_t nCurrLine = 0; nCurrLine < nLineCount; ++nCurrLine )
    {
        SwTwips nWidth = 0;
        SwTableLine* pLine = GetTabLines()[nCurrLine];
        SAL_WARN_IF( !pLine, "sw.core", "Missing Table Line" );
        const size_t nColCount = pLine->GetTabBoxes().size();
        SAL_WARN_IF( !nColCount, "sw.core", "Empty Table Line" );
        for( size_t nCurrCol = 0; nCurrCol < nColCount; ++nCurrCol )
        {
            SwTableBox* pBox = pLine->GetTabBoxes()[nCurrCol];
            assert(pBox);
            SAL_WARN_IF(GetTableNode()->EndOfSectionIndex() <= index.GetIndex(), "sw.core", "Box not in table nodes");
            SAL_WARN_IF(!index.GetNode().IsStartNode(), "sw.core", "No box start node");
            index = *index.GetNode().EndOfSectionNode();
            ++index;
            SwTwips nNewWidth = pBox->GetFrameFormat()->GetFrameSize().GetWidth() + nWidth;
            tools::Long nRowSp = pBox->getRowSpan();
            if( nRowSp < 0 )
            {
                SAL_WARN_IF( aIter == aRowSpanCells.end(),
                        "sw.core", "Missing master box");
                if (aIter != aRowSpanCells.end())
                {
                    SAL_WARN_IF( aIter->nLeft != nWidth || aIter->nRight != nNewWidth,
                        "sw.core", "Wrong position/size of overlapped table box");
                    --(aIter->nRowSpan);
                    SAL_WARN_IF( aIter->nRowSpan != -nRowSp, "sw.core",
                            "Wrong row span value" );
                    if( nRowSp == -1 )
                    {
                        aIter = aRowSpanCells.erase(aIter);
                    }
                    else
                        ++aIter;
                }
            }
            else if( nRowSp != 1 )
            {
                SAL_WARN_IF( !nRowSp, "sw.core", "Zero row span?!" );
                RowSpanCheck aEntry;
                aEntry.nLeft = nWidth;
                aEntry.nRight = nNewWidth;
                aEntry.nRowSpan = nRowSp;
                aRowSpanCells.insert( aIter, aEntry );
            }
            nWidth = nNewWidth;
        }
        if( !nCurrLine )
            nLineWidth = nWidth;
        SAL_WARN_IF( nWidth != nLineWidth, "sw.core",
                "Different Line Widths: first: " << nLineWidth
                << " current [" << nCurrLine << "]: " <<  nWidth);
        SAL_WARN_IF( std::abs(nWidth - nTabSize) > 1 /* how tolerant? */, "sw.core",
                "Line width differs from table width: " << nTabSize
                << " current [" << nCurrLine << "]: " << nWidth);
        SAL_WARN_IF( nWidth < 0 || nWidth > USHRT_MAX, "sw.core",
                "Width out of range [" << nCurrLine << "]: " << nWidth);
        SAL_WARN_IF( aIter != aRowSpanCells.end(), "sw.core",
                "Missing overlapped box" );
        aIter = aRowSpanCells.begin();
    }
    bool bEmpty = aRowSpanCells.empty();
    SAL_WARN_IF( !bEmpty, "sw.core", "Open row span detected" );
    SAL_WARN_IF(GetTableNode()->EndOfSectionNode() != &index.GetNode(), "sw.core", "table end node not found");
}

#endif

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */