qtexttable.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qtexttable.h"
#include "qtextcursor.h"
#include "qtextformat.h"
#include <qdebug.h>
#include "qtextcursor_p.h"
#include "qtexttable_p.h"
#include "qvarlengtharray.h"
 
#include <algorithm>
#include <stdlib.h>
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
void QTextTableCell::setFormat(const QTextCharFormat &format)
{
    QTextCharFormat fmt = format;
    fmt.clearProperty(QTextFormat::ObjectIndex);
    fmt.setObjectType(QTextFormat::TableCellObject);
    QTextDocumentPrivate *p = const_cast<QTextDocumentPrivate *>(QTextDocumentPrivate::get(table));
    QTextDocumentPrivate::FragmentIterator frag(&p->fragmentMap(), fragment);
 
    QTextFormatCollection *c = p->formatCollection();
    QTextCharFormat oldFormat = c->charFormat(frag->format);
    fmt.setTableCellRowSpan(oldFormat.tableCellRowSpan());
    fmt.setTableCellColumnSpan(oldFormat.tableCellColumnSpan());
 
    p->setCharFormat(frag.position(), 1, fmt, QTextDocumentPrivate::SetFormatAndPreserveObjectIndices);
}
 
QTextCharFormat QTextTableCell::format() const
{
    const QTextDocumentPrivate *p = QTextDocumentPrivate::get(table);
    const QTextFormatCollection *c = p->formatCollection();
 
    QTextCharFormat fmt = c->charFormat(tableCellFormatIndex());
    fmt.setObjectType(QTextFormat::TableCellObject);
    return fmt;
}
 
int QTextTableCell::tableCellFormatIndex() const
{
    const QTextDocumentPrivate *p = QTextDocumentPrivate::get(table);
    return QTextDocumentPrivate::FragmentIterator(&p->fragmentMap(), fragment)->format;
}
 
int QTextTableCell::row() const
{
    const QTextTablePrivate *tp = table->d_func();
    if (tp->dirty)
        tp->update();
 
    int idx = tp->findCellIndex(fragment);
    if (idx == -1)
        return idx;
    return tp->cellIndices.at(idx) / tp->nCols;
}
 
int QTextTableCell::column() const
{
    const QTextTablePrivate *tp = table->d_func();
    if (tp->dirty)
        tp->update();
 
    int idx = tp->findCellIndex(fragment);
    if (idx == -1)
        return idx;
    return tp->cellIndices.at(idx) % tp->nCols;
}
 
int QTextTableCell::rowSpan() const
{
    return format().tableCellRowSpan();
}
 
int QTextTableCell::columnSpan() const
{
    return format().tableCellColumnSpan();
}
 
QTextCursor QTextTableCell::firstCursorPosition() const
{
    return QTextCursorPrivate::fromPosition(table->d_func()->pieceTable, firstPosition());
}
 
QTextCursor QTextTableCell::lastCursorPosition() const
{
    return QTextCursorPrivate::fromPosition(table->d_func()->pieceTable, lastPosition());
}
 
 
int QTextTableCell::firstPosition() const
{
    const QTextDocumentPrivate *p = QTextDocumentPrivate::get(table);
    return p->fragmentMap().position(fragment) + 1;
}
 
int QTextTableCell::lastPosition() const
{
    const QTextDocumentPrivate *p = QTextDocumentPrivate::get(table);
    const QTextTablePrivate *td = table->d_func();
    int index = table->d_func()->findCellIndex(fragment);
    int f;
    if (index != -1)
        f = td->cells.value(index + 1, td->fragment_end);
    else
        f = td->fragment_end;
    return p->fragmentMap().position(f);
}
 
 
QTextFrame::iterator QTextTableCell::begin() const
{
    const QTextDocumentPrivate *p = QTextDocumentPrivate::get(table);
    int b = p->blockMap().findNode(firstPosition());
    int e = p->blockMap().findNode(lastPosition()+1);
    return QTextFrame::iterator(const_cast<QTextTable *>(table), b, b, e);
}
 
QTextFrame::iterator QTextTableCell::end() const
{
    const QTextDocumentPrivate *p = QTextDocumentPrivate::get(table);
    int b = p->blockMap().findNode(firstPosition());
    int e = p->blockMap().findNode(lastPosition()+1);
    return QTextFrame::iterator(const_cast<QTextTable *>(table), e, b, e);
}
 
 
QTextTable *QTextTablePrivate::createTable(QTextDocumentPrivate *pieceTable, int pos, int rows, int cols, const QTextTableFormat &tableFormat)
{
    QTextTableFormat fmt = tableFormat;
    fmt.setColumns(cols);
    QTextTable *table = qobject_cast<QTextTable *>(pieceTable->createObject(fmt));
    Q_ASSERT(table);
 
    pieceTable->beginEditBlock();
 
//     qDebug("---> createTable: rows=%d, cols=%d at %d", rows, cols, pos);
    // add block after table
    QTextCharFormat charFmt;
    charFmt.setObjectIndex(table->objectIndex());
    charFmt.setObjectType(QTextFormat::TableCellObject);
 
 
    int charIdx = pieceTable->formatCollection()->indexForFormat(charFmt);
    int cellIdx = pieceTable->formatCollection()->indexForFormat(QTextBlockFormat());
 
    QTextTablePrivate *d = table->d_func();
    d->blockFragmentUpdates = true;
 
    d->fragment_start = pieceTable->insertBlock(QTextBeginningOfFrame, pos, cellIdx, charIdx);
    d->cells.append(d->fragment_start);
    ++pos;
 
    for (int i = 1; i < rows*cols; ++i) {
        d->cells.append(pieceTable->insertBlock(QTextBeginningOfFrame, pos, cellIdx, charIdx));
//      qDebug("      addCell at %d", pos);
        ++pos;
    }
 
    d->fragment_end = pieceTable->insertBlock(QTextEndOfFrame, pos, cellIdx, charIdx);
//  qDebug("      addEOR at %d", pos);
    ++pos;
 
    d->blockFragmentUpdates = false;
    d->dirty = true;
 
    pieceTable->endEditBlock();
 
    return table;
}
 
struct QFragmentFindHelper
{
    inline QFragmentFindHelper(int _pos, const QTextDocumentPrivate::FragmentMap &map)
        : pos(_pos), fragmentMap(map) {}
    uint pos;
    const QTextDocumentPrivate::FragmentMap &fragmentMap;
};
 
static inline bool operator<(int fragment, const QFragmentFindHelper &helper)
{
    return helper.fragmentMap.position(fragment) < helper.pos;
}
 
static inline bool operator<(const QFragmentFindHelper &helper, int fragment)
{
    return helper.pos < helper.fragmentMap.position(fragment);
}
 
int QTextTablePrivate::findCellIndex(int fragment) const
{
    QFragmentFindHelper helper(pieceTable->fragmentMap().position(fragment),
                              pieceTable->fragmentMap());
    const auto it = std::lower_bound(cells.constBegin(), cells.constEnd(), helper);
    if ((it == cells.constEnd()) || (helper < *it))
        return -1;
    return it - cells.constBegin();
}
 
void QTextTablePrivate::fragmentAdded(QChar type, uint fragment)
{
    dirty = true;
    if (blockFragmentUpdates)
        return;
    if (type == QTextBeginningOfFrame) {
        Q_ASSERT(cells.indexOf(int(fragment)) == -1);
        const uint pos = pieceTable->fragmentMap().position(fragment);
        QFragmentFindHelper helper(pos, pieceTable->fragmentMap());
        auto it = std::lower_bound(cells.begin(), cells.end(), helper);
        cells.insert(it, fragment);
        if (!fragment_start || pos < pieceTable->fragmentMap().position(fragment_start))
            fragment_start = fragment;
        return;
    }
    QTextFramePrivate::fragmentAdded(type, fragment);
}
 
void QTextTablePrivate::fragmentRemoved(QChar type, uint fragment)
{
    dirty = true;
    if (blockFragmentUpdates)
        return;
    if (type == QTextBeginningOfFrame) {
        Q_ASSERT(cells.indexOf(int(fragment)) != -1);
        cells.removeAll(int(fragment));
        if (fragment_start == fragment && cells.size()) {
            fragment_start = cells.at(0);
        }
        if (fragment_start != fragment)
            return;
    }
    QTextFramePrivate::fragmentRemoved(type, fragment);
}
 
void QTextTablePrivate::update() const
{
    Q_Q(const QTextTable);
    nCols = q->format().columns();
    nRows = (cells.size() + nCols-1)/nCols;
//     qDebug(">>>> QTextTablePrivate::update, nRows=%d, nCols=%d", nRows, nCols);
 
    grid.assign(nRows * nCols, 0);
 
    QTextDocumentPrivate *p = pieceTable;
    QTextFormatCollection *c = p->formatCollection();
 
    cellIndices.resize(cells.size());
 
    int cell = 0;
    for (int i = 0; i < cells.size(); ++i) {
        int fragment = cells.at(i);
        QTextCharFormat fmt = c->charFormat(QTextDocumentPrivate::FragmentIterator(&p->fragmentMap(), fragment)->format);
        int rowspan = fmt.tableCellRowSpan();
        int colspan = fmt.tableCellColumnSpan();
 
        // skip taken cells
        while (cell < nRows*nCols && grid[cell])
            ++cell;
 
        int r = cell/nCols;
        int c = cell%nCols;
        cellIndices[i] = cell;
 
        if (r + rowspan > nRows) {
            grid.resize((r + rowspan) * nCols, 0);
            nRows = r + rowspan;
        }
 
        Q_ASSERT(c + colspan <= nCols);
        for (int ii = 0; ii < rowspan; ++ii) {
            for (int jj = 0; jj < colspan; ++jj) {
                Q_ASSERT(grid[(r+ii)*nCols + c+jj] == 0);
                grid[(r+ii)*nCols + c+jj] = fragment;
//              qDebug("    setting cell %d span=%d/%d at %d/%d", fragment, rowspan, colspan, r+ii, c+jj);
            }
        }
    }
//     qDebug("<<<< end: nRows=%d, nCols=%d", nRows, nCols);
 
    dirty = false;
}
 
 
 
 
 
QTextTable::QTextTable(QTextDocument *doc)
    : QTextFrame(*new QTextTablePrivate(doc), doc)
{
}
 
QTextTable::~QTextTable()
{
}
 
 
QTextTableCell QTextTable::cellAt(int row, int col) const
{
    Q_D(const QTextTable);
    if (d->dirty)
        d->update();
 
    if (row < 0 || row >= d->nRows || col < 0 || col >= d->nCols)
        return QTextTableCell();
 
    return QTextTableCell(this, d->grid[row*d->nCols + col]);
}
 
QTextTableCell QTextTable::cellAt(int position) const
{
    Q_D(const QTextTable);
    if (d->dirty)
        d->update();
 
    uint pos = (uint)position;
    const QTextDocumentPrivate::FragmentMap &map = d->pieceTable->fragmentMap();
    if (position < 0 || map.position(d->fragment_start) >= pos || map.position(d->fragment_end) < pos)
        return QTextTableCell();
 
    QFragmentFindHelper helper(position, map);
    auto it = std::lower_bound(d->cells.begin(), d->cells.end(), helper);
    if (it != d->cells.begin())
        --it;
 
    return QTextTableCell(this, *it);
}
 
QTextTableCell QTextTable::cellAt(const QTextCursor &c) const
{
    return cellAt(c.position());
}
 
void QTextTable::resize(int rows, int cols)
{
    Q_D(QTextTable);
    if (d->dirty)
        d->update();
 
    int nRows = this->rows();
    int nCols = this->columns();
 
    if (rows == nRows && cols == nCols)
        return;
 
    d->pieceTable->beginEditBlock();
 
    if (nCols < cols)
        insertColumns(nCols, cols - nCols);
    else if (nCols > cols)
        removeColumns(cols, nCols - cols);
 
    if (nRows < rows)
        insertRows(nRows, rows-nRows);
    else if (nRows > rows)
        removeRows(rows, nRows-rows);
 
    d->pieceTable->endEditBlock();
}
 
void QTextTable::insertRows(int pos, int num)
{
    Q_D(QTextTable);
    if (num <= 0)
        return;
 
    if (d->dirty)
        d->update();
 
    if (pos > d->nRows || pos < 0)
        pos = d->nRows;
 
//     qDebug() << "-------- insertRows" << pos << num;
    QTextDocumentPrivate *p = d->pieceTable;
    QTextFormatCollection *c = p->formatCollection();
    p->beginEditBlock();
 
    int extended = 0;
    int insert_before = 0;
    if (pos > 0 && pos < d->nRows) {
        int lastCell = -1;
        for (int i = 0; i < d->nCols; ++i) {
            int cell = d->grid[pos*d->nCols + i];
            if (cell == d->grid[(pos-1)*d->nCols+i]) {
                // cell spans the insertion place, extend it
                if (cell != lastCell) {
                    QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), cell);
                    QTextCharFormat fmt = c->charFormat(it->format);
                    fmt.setTableCellRowSpan(fmt.tableCellRowSpan() + num);
                    p->setCharFormat(it.position(), 1, fmt);
                }
                extended++;
            } else if (!insert_before) {
                insert_before = cell;
            }
            lastCell = cell;
        }
    } else {
        insert_before = (pos == 0 ? d->grid[0] : d->fragment_end);
    }
    if (extended < d->nCols) {
        Q_ASSERT(insert_before);
        QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), insert_before);
        QTextCharFormat fmt = c->charFormat(it->format);
        fmt.setTableCellRowSpan(1);
        fmt.setTableCellColumnSpan(1);
        Q_ASSERT(fmt.objectIndex() == objectIndex());
        int pos = it.position();
        int cfmt = p->formatCollection()->indexForFormat(fmt);
        int bfmt = p->formatCollection()->indexForFormat(QTextBlockFormat());
//         qDebug("inserting %d cells, nCols=%d extended=%d", num*(d->nCols-extended), d->nCols, extended);
        for (int i = 0; i < num*(d->nCols-extended); ++i)
            p->insertBlock(QTextBeginningOfFrame, pos, bfmt, cfmt, QTextUndoCommand::MoveCursor);
    }
 
//     qDebug() << "-------- end insertRows" << pos << num;
    p->endEditBlock();
}
 
void QTextTable::insertColumns(int pos, int num)
{
    Q_D(QTextTable);
    if (num <= 0)
        return;
 
    if (d->dirty)
        d->update();
 
    if (pos > d->nCols || pos < 0)
        pos = d->nCols;
 
//     qDebug() << "-------- insertCols" << pos << num;
    QTextDocumentPrivate *p = d->pieceTable;
    QTextFormatCollection *c = p->formatCollection();
    p->beginEditBlock();
 
    QList<int> extendedSpans;
    for (int i = 0; i < d->nRows; ++i) {
        int cell;
        if (i == d->nRows - 1 && pos == d->nCols) {
            cell = d->fragment_end;
        } else {
            int logicalGridIndexBeforePosition = pos > 0
                                                 ? d->findCellIndex(d->grid[i*d->nCols + pos - 1])
                                                 : -1;
 
            // Search for the logical insertion point by skipping past cells which are not the first
            // cell in a rowspan. This means any cell for which the logical grid index is
            // less than the logical cell index of the cell before the insertion.
            int logicalGridIndex;
            int gridArrayOffset = i*d->nCols + pos;
            do {
                cell = d->grid[gridArrayOffset];
                logicalGridIndex = d->findCellIndex(cell);
                gridArrayOffset++;
            } while (logicalGridIndex < logicalGridIndexBeforePosition
                     && gridArrayOffset < d->nRows*d->nCols);
 
            if (logicalGridIndex < logicalGridIndexBeforePosition
                && gridArrayOffset == d->nRows*d->nCols)
                cell = d->fragment_end;
        }
 
        if (pos > 0 && pos < d->nCols && cell == d->grid[i*d->nCols + pos - 1]) {
            // cell spans the insertion place, extend it
            if (!extendedSpans.contains(cell)) {
                QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), cell);
                QTextCharFormat fmt = c->charFormat(it->format);
                fmt.setTableCellColumnSpan(fmt.tableCellColumnSpan() + num);
                p->setCharFormat(it.position(), 1, fmt);
                d->dirty = true;
                extendedSpans << cell;
            }
        } else {
            /* If the next cell is spanned from the row above, we need to find the right position
            to insert to */
            if (i > 0 && pos < d->nCols && cell == d->grid[(i-1) * d->nCols + pos]) {
                int gridIndex = i*d->nCols + pos;
                const int gridEnd = d->nRows * d->nCols - 1;
                while (gridIndex < gridEnd && cell == d->grid[gridIndex]) {
                    ++gridIndex;
                }
                if (gridIndex == gridEnd)
                    cell = d->fragment_end;
                else
                    cell = d->grid[gridIndex];
            }
            QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), cell);
            QTextCharFormat fmt = c->charFormat(it->format);
            fmt.setTableCellRowSpan(1);
            fmt.setTableCellColumnSpan(1);
            Q_ASSERT(fmt.objectIndex() == objectIndex());
            int position = it.position();
            int cfmt = p->formatCollection()->indexForFormat(fmt);
            int bfmt = p->formatCollection()->indexForFormat(QTextBlockFormat());
            for (int i = 0; i < num; ++i)
                p->insertBlock(QTextBeginningOfFrame, position, bfmt, cfmt, QTextUndoCommand::MoveCursor);
        }
    }
 
    QTextTableFormat tfmt = format();
    tfmt.setColumns(tfmt.columns()+num);
    QList<QTextLength> columnWidths = tfmt.columnWidthConstraints();
    if (! columnWidths.isEmpty()) {
        for (int i = num; i > 0; --i)
            columnWidths.insert(pos, columnWidths.at(qMax(0, pos - 1)));
    }
    tfmt.setColumnWidthConstraints (columnWidths);
    QTextObject::setFormat(tfmt);
 
//     qDebug() << "-------- end insertCols" << pos << num;
    p->endEditBlock();
}
 
void QTextTable::appendRows(int count)
{
    insertRows(rows(), count);
}
 
void QTextTable::appendColumns(int count)
{
    insertColumns(columns(), count);
}
 
void QTextTable::removeRows(int pos, int num)
{
    Q_D(QTextTable);
//     qDebug() << "-------- removeRows" << pos << num;
 
    if (num <= 0 || pos < 0)
        return;
    if (d->dirty)
        d->update();
    if (pos >= d->nRows)
        return;
    if (pos+num > d->nRows)
        num = d->nRows - pos;
 
    QTextDocumentPrivate *p = d->pieceTable;
    QTextFormatCollection *collection = p->formatCollection();
    p->beginEditBlock();
 
    // delete whole table?
    if (pos == 0 && num == d->nRows) {
        const int pos = p->fragmentMap().position(d->fragment_start);
        p->remove(pos, p->fragmentMap().position(d->fragment_end) - pos + 1);
        p->endEditBlock();
        return;
    }
 
    p->aboutToRemoveCell(cellAt(pos, 0).firstPosition(), cellAt(pos + num - 1, d->nCols - 1).lastPosition());
 
    QList<int> touchedCells;
    for (int r = pos; r < pos + num; ++r) {
        for (int c = 0; c < d->nCols; ++c) {
            int cell = d->grid[r*d->nCols + c];
            if (touchedCells.contains(cell))
                continue;
            touchedCells << cell;
            QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), cell);
            QTextCharFormat fmt = collection->charFormat(it->format);
            int span = fmt.tableCellRowSpan();
            if (span > 1) {
                fmt.setTableCellRowSpan(span - 1);
                p->setCharFormat(it.position(), 1, fmt);
            } else {
                // remove cell
                int index = d->cells.indexOf(cell) + 1;
                int f_end = index < d->cells.size() ? d->cells.at(index) : d->fragment_end;
                p->remove(it.position(), p->fragmentMap().position(f_end) - it.position());
            }
        }
    }
 
    p->endEditBlock();
//     qDebug() << "-------- end removeRows" << pos << num;
}
 
void QTextTable::removeColumns(int pos, int num)
{
    Q_D(QTextTable);
//     qDebug() << "-------- removeCols" << pos << num;
 
    if (num <= 0 || pos < 0)
        return;
    if (d->dirty)
        d->update();
    if (pos >= d->nCols)
        return;
    if (pos + num > d->nCols)
        pos = d->nCols - num;
 
    QTextDocumentPrivate *p = d->pieceTable;
    QTextFormatCollection *collection = p->formatCollection();
    p->beginEditBlock();
 
    // delete whole table?
    if (pos == 0 && num == d->nCols) {
        const int pos = p->fragmentMap().position(d->fragment_start);
        p->remove(pos, p->fragmentMap().position(d->fragment_end) - pos + 1);
        p->endEditBlock();
        return;
    }
 
    p->aboutToRemoveCell(cellAt(0, pos).firstPosition(), cellAt(d->nRows - 1, pos + num - 1).lastPosition());
 
    QList<int> touchedCells;
    for (int r = 0; r < d->nRows; ++r) {
        for (int c = pos; c < pos + num; ++c) {
            int cell = d->grid[r*d->nCols + c];
            QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), cell);
            QTextCharFormat fmt = collection->charFormat(it->format);
            int span = fmt.tableCellColumnSpan();
            if (touchedCells.contains(cell) && span <= 1)
                continue;
            touchedCells << cell;
 
            if (span > 1) {
                fmt.setTableCellColumnSpan(span - 1);
                p->setCharFormat(it.position(), 1, fmt);
            } else {
                // remove cell
                int index = d->cells.indexOf(cell) + 1;
                int f_end = index < d->cells.size() ? d->cells.at(index) : d->fragment_end;
                p->remove(it.position(), p->fragmentMap().position(f_end) - it.position());
            }
        }
    }
 
    QTextTableFormat tfmt = format();
    tfmt.setColumns(tfmt.columns()-num);
    QList<QTextLength> columnWidths = tfmt.columnWidthConstraints();
    if (columnWidths.size() > pos) {
        columnWidths.remove(pos, num);
        tfmt.setColumnWidthConstraints (columnWidths);
    }
    QTextObject::setFormat(tfmt);
 
    p->endEditBlock();
//     qDebug() << "-------- end removeCols" << pos << num;
}
 
void QTextTable::mergeCells(int row, int column, int numRows, int numCols)
{
    Q_D(QTextTable);
 
    if (d->dirty)
        d->update();
 
    QTextDocumentPrivate *p = d->pieceTable;
    QTextFormatCollection *fc = p->formatCollection();
 
    const QTextTableCell cell = cellAt(row, column);
    if (!cell.isValid() || row != cell.row() || column != cell.column())
        return;
 
    QTextCharFormat fmt = cell.format();
    const int rowSpan = fmt.tableCellRowSpan();
    const int colSpan = fmt.tableCellColumnSpan();
 
    numRows = qMin(numRows, rows() - cell.row());
    numCols = qMin(numCols, columns() - cell.column());
 
    // nothing to merge?
    if (numRows < rowSpan || numCols < colSpan)
        return;
 
    // check the edges of the merge rect to make sure no cell spans the edge
    for (int r = row; r < row + numRows; ++r) {
        if (cellAt(r, column) == cellAt(r, column - 1))
            return;
        if (cellAt(r, column + numCols) == cellAt(r, column + numCols - 1))
            return;
    }
 
    for (int c = column; c < column + numCols; ++c) {
        if (cellAt(row, c) == cellAt(row - 1, c))
            return;
        if (cellAt(row + numRows, c) == cellAt(row + numRows - 1, c))
            return;
    }
 
    p->beginEditBlock();
 
    const int origCellPosition = cell.firstPosition() - 1;
 
    const int cellFragment = d->grid[row * d->nCols + column];
 
    // find the position at which to insert the contents of the merged cells
    QFragmentFindHelper helper(origCellPosition, p->fragmentMap());
    const auto begin = d->cells.cbegin();
    const auto it = std::lower_bound(begin, d->cells.cend(), helper);
    Q_ASSERT(it != d->cells.cend());
    Q_ASSERT(!(helper < *it));
    Q_ASSERT(*it == cellFragment);
    const int insertCellIndex = it - begin;
    int insertFragment = d->cells.value(insertCellIndex + 1, d->fragment_end);
    uint insertPos = p->fragmentMap().position(insertFragment);
 
    d->blockFragmentUpdates = true;
 
    bool rowHasText = cell.firstCursorPosition().block().length();
    bool needsParagraph = rowHasText && colSpan == numCols;
 
    // find all cells that will be erased by the merge
    for (int r = row; r < row + numRows; ++r) {
        int firstColumn = r < row + rowSpan ? column + colSpan : column;
 
        // don't recompute the cell index for the first row
        int firstCellIndex = r == row ? insertCellIndex + 1 : -1;
        int cellIndex = firstCellIndex;
 
        for (int c = firstColumn; c < column + numCols; ++c) {
            const int fragment = d->grid[r * d->nCols + c];
 
            // already handled?
            if (fragment == cellFragment)
                continue;
 
            QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), fragment);
            uint pos = it.position();
 
            if (firstCellIndex == -1) {
                QFragmentFindHelper helper(pos, p->fragmentMap());
                const auto begin = d->cells.cbegin();
                const auto it = std::lower_bound(begin, d->cells.cend(), helper);
                Q_ASSERT(it != d->cells.cend());
                Q_ASSERT(!(helper < *it));
                Q_ASSERT(*it == fragment);
                firstCellIndex = cellIndex = it - begin;
            }
 
            ++cellIndex;
 
            QTextCharFormat fmt = fc->charFormat(it->format);
 
            const int cellRowSpan = fmt.tableCellRowSpan();
            const int cellColSpan = fmt.tableCellColumnSpan();
 
            // update the grid for this cell
            for (int i = r; i < r + cellRowSpan; ++i)
                for (int j = c; j < c + cellColSpan; ++j)
                    d->grid[i * d->nCols + j] = cellFragment;
 
            // erase the cell marker
            p->remove(pos, 1);
 
            const int nextFragment = d->cells.value(cellIndex, d->fragment_end);
            const uint nextPos = p->fragmentMap().position(nextFragment);
 
            Q_ASSERT(nextPos >= pos);
 
            // merge the contents of the cell (if not empty)
            if (nextPos > pos) {
                if (needsParagraph) {
                    needsParagraph = false;
                    QTextCursorPrivate::fromPosition(p, insertPos++).insertBlock();
                    p->move(pos + 1, insertPos, nextPos - pos);
                } else if (rowHasText) {
                    QTextCursorPrivate::fromPosition(p, insertPos++).insertText(" "_L1);
                    p->move(pos + 1, insertPos, nextPos - pos);
                } else {
                    p->move(pos, insertPos, nextPos - pos);
                }
 
                insertPos += nextPos - pos;
                rowHasText = true;
            }
        }
 
        if (rowHasText) {
            needsParagraph = true;
            rowHasText = false;
        }
 
        // erase cells from last row
        if (firstCellIndex >= 0) {
            d->cellIndices.remove(firstCellIndex, cellIndex - firstCellIndex);
            d->cells.erase(d->cells.begin() + firstCellIndex, d->cells.begin() + cellIndex);
        }
    }
 
    d->fragment_start = d->cells.constFirst();
 
    fmt.setTableCellRowSpan(numRows);
    fmt.setTableCellColumnSpan(numCols);
    p->setCharFormat(origCellPosition, 1, fmt);
 
    d->blockFragmentUpdates = false;
    d->dirty = false;
 
    p->endEditBlock();
}
 
void QTextTable::mergeCells(const QTextCursor &cursor)
{
    if (!cursor.hasComplexSelection())
        return;
 
    int firstRow, numRows, firstColumn, numColumns;
    cursor.selectedTableCells(&firstRow, &numRows, &firstColumn, &numColumns);
    mergeCells(firstRow, firstColumn, numRows, numColumns);
}
 
void QTextTable::splitCell(int row, int column, int numRows, int numCols)
{
    Q_D(QTextTable);
 
    if (d->dirty)
        d->update();
 
    QTextDocumentPrivate *p = d->pieceTable;
    QTextFormatCollection *c = p->formatCollection();
 
    const QTextTableCell cell = cellAt(row, column);
    if (!cell.isValid())
        return;
    row = cell.row();
    column = cell.column();
 
    QTextCharFormat fmt = cell.format();
    const int rowSpan = fmt.tableCellRowSpan();
    const int colSpan = fmt.tableCellColumnSpan();
 
    // nothing to split?
    if (numRows > rowSpan || numCols > colSpan)
        return;
 
    p->beginEditBlock();
 
    const int origCellPosition = cell.firstPosition() - 1;
 
    QVarLengthArray<int> rowPositions(rowSpan);
 
    rowPositions[0] = cell.lastPosition();
 
    for (int r = row + 1; r < row + rowSpan; ++r) {
        // find the cell before which to insert the new cell markers
        int gridIndex = r * d->nCols + column;
        const auto begin = d->cellIndices.cbegin();
        const auto it = std::upper_bound(begin, d->cellIndices.cend(), gridIndex);
        int fragment = d->cells.value(it - begin, d->fragment_end);
        rowPositions[r - row] = p->fragmentMap().position(fragment);
    }
 
    fmt.setTableCellColumnSpan(1);
    fmt.setTableCellRowSpan(1);
    const int fmtIndex = c->indexForFormat(fmt);
    const int blockIndex = p->blockMap().find(cell.lastPosition())->format;
 
    int insertAdjustement = 0;
    for (int i = 0; i < numRows; ++i) {
        for (int c = 0; c < colSpan - numCols; ++c)
            p->insertBlock(QTextBeginningOfFrame, rowPositions[i] + insertAdjustement + c, blockIndex, fmtIndex);
        insertAdjustement += colSpan - numCols;
    }
 
    for (int i = numRows; i < rowSpan; ++i) {
        for (int c = 0; c < colSpan; ++c)
            p->insertBlock(QTextBeginningOfFrame, rowPositions[i] + insertAdjustement + c, blockIndex, fmtIndex);
        insertAdjustement += colSpan;
    }
 
    fmt.setTableCellRowSpan(numRows);
    fmt.setTableCellColumnSpan(numCols);
    p->setCharFormat(origCellPosition, 1, fmt);
 
    p->endEditBlock();
}
 
int QTextTable::rows() const
{
    Q_D(const QTextTable);
    if (d->dirty)
        d->update();
 
    return d->nRows;
}
 
int QTextTable::columns() const
{
    Q_D(const QTextTable);
    if (d->dirty)
        d->update();
 
    return d->nCols;
}
 
QTextCursor QTextTable::rowStart(const QTextCursor &c) const
{
    Q_D(const QTextTable);
    QTextTableCell cell = cellAt(c);
    if (!cell.isValid())
        return QTextCursor();
 
    int row = cell.row();
    QTextDocumentPrivate *p = d->pieceTable;
    QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), d->grid[row*d->nCols]);
    return QTextCursorPrivate::fromPosition(p, it.position());
}
 
QTextCursor QTextTable::rowEnd(const QTextCursor &c) const
{
    Q_D(const QTextTable);
    QTextTableCell cell = cellAt(c);
    if (!cell.isValid())
        return QTextCursor();
 
    int row = cell.row() + 1;
    int fragment = row < d->nRows ? d->grid[row*d->nCols] : d->fragment_end;
    QTextDocumentPrivate *p = d->pieceTable;
    QTextDocumentPrivate::FragmentIterator it(&p->fragmentMap(), fragment);
    return QTextCursorPrivate::fromPosition(p, it.position() - 1);
}
 
void QTextTable::setFormat(const QTextTableFormat &format)
{
    QTextTableFormat fmt = format;
    // don't try to change the number of table columns from here
    fmt.setColumns(columns());
    QTextObject::setFormat(fmt);
}
 
QT_END_NAMESPACE
 
#include "moc_qtexttable.cpp"