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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 2561 insertions, 0 deletions

diff --git a/src/gui/text/qtextcursor.cpp b/src/gui/text/qtextcursor.cpp
new file mode 100644
index 0000000000..6ddfdb00e1
--- /dev/null
+++ b/src/gui/text/qtextcursor.cpp
@@ -0,0 +1,2561 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qtextcursor.h"
+#include "qtextcursor_p.h"
+#include "qglobal.h"
+#include "qtextdocumentfragment.h"
+#include "qtextdocumentfragment_p.h"
+#include "qtextlist.h"
+#include "qtexttable.h"
+#include "qtexttable_p.h"
+#include "qtextengine_p.h"
+#include "qabstracttextdocumentlayout.h"
+
+#include <qtextlayout.h>
+#include <qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+enum {
+    AdjustPrev = 0x1,
+    AdjustUp = 0x3,
+    AdjustNext = 0x4,
+    AdjustDown = 0x12
+};
+
+QTextCursorPrivate::QTextCursorPrivate(QTextDocumentPrivate *p)
+    : priv(p), x(0), position(0), anchor(0), adjusted_anchor(0),
+      currentCharFormat(-1), visualNavigation(false), keepPositionOnInsert(false),
+      changed(false)
+{
+    priv->addCursor(this);
+}
+
+QTextCursorPrivate::QTextCursorPrivate(const QTextCursorPrivate &rhs)
+    : QSharedData(rhs)
+{
+    position = rhs.position;
+    anchor = rhs.anchor;
+    adjusted_anchor = rhs.adjusted_anchor;
+    priv = rhs.priv;
+    x = rhs.x;
+    currentCharFormat = rhs.currentCharFormat;
+    visualNavigation = rhs.visualNavigation;
+    keepPositionOnInsert = rhs.keepPositionOnInsert;
+    changed = rhs.changed;
+    priv->addCursor(this);
+}
+
+QTextCursorPrivate::~QTextCursorPrivate()
+{
+    if (priv)
+        priv->removeCursor(this);
+}
+
+QTextCursorPrivate::AdjustResult QTextCursorPrivate::adjustPosition(int positionOfChange, int charsAddedOrRemoved, QTextUndoCommand::Operation op)
+{
+    QTextCursorPrivate::AdjustResult result = QTextCursorPrivate::CursorMoved;
+    // not(!) <= , so that inserting text adjusts the cursor correctly
+    if (position < positionOfChange
+        || (position == positionOfChange
+            && (op == QTextUndoCommand::KeepCursor
+                || keepPositionOnInsert)
+            )
+         ) {
+        result = CursorUnchanged;
+    } else {
+        if (charsAddedOrRemoved < 0 && position < positionOfChange - charsAddedOrRemoved)
+            position = positionOfChange;
+        else
+            position += charsAddedOrRemoved;
+
+        currentCharFormat = -1;
+    }
+
+    if (anchor >= positionOfChange
+        && (anchor != positionOfChange || op != QTextUndoCommand::KeepCursor)) {
+        if (charsAddedOrRemoved < 0 && anchor < positionOfChange - charsAddedOrRemoved)
+            anchor = positionOfChange;
+        else
+            anchor += charsAddedOrRemoved;
+    }
+
+    if (adjusted_anchor >= positionOfChange
+        && (adjusted_anchor != positionOfChange || op != QTextUndoCommand::KeepCursor)) {
+        if (charsAddedOrRemoved < 0 && adjusted_anchor < positionOfChange - charsAddedOrRemoved)
+            adjusted_anchor = positionOfChange;
+        else
+            adjusted_anchor += charsAddedOrRemoved;
+    }
+
+    return result;
+}
+
+void QTextCursorPrivate::setX()
+{
+    if (priv->isInEditBlock()) {
+        x = -1; // mark dirty
+        return;
+    }
+
+    QTextBlock block = this->block();
+    const QTextLayout *layout = blockLayout(block);
+    int pos = position - block.position();
+
+    QTextLine line = layout->lineForTextPosition(pos);
+    if (line.isValid())
+        x = line.cursorToX(pos);
+    else
+        x = -1; // delayed init.  Makes movePosition() call setX later on again.
+}
+
+void QTextCursorPrivate::remove()
+{
+    if (anchor == position)
+        return;
+    currentCharFormat = -1;
+    int pos1 = position;
+    int pos2 = adjusted_anchor;
+    QTextUndoCommand::Operation op = QTextUndoCommand::KeepCursor;
+    if (pos1 > pos2) {
+        pos1 = adjusted_anchor;
+        pos2 = position;
+        op = QTextUndoCommand::MoveCursor;
+    }
+
+    // deleting inside table? -> delete only content
+    QTextTable *table = complexSelectionTable();
+    if (table) {
+        priv->beginEditBlock();
+        int startRow, startCol, numRows, numCols;
+        selectedTableCells(&startRow, &numRows, &startCol, &numCols);
+        clearCells(table, startRow, startCol, numRows, numCols, op);
+        adjusted_anchor = anchor = position;
+        priv->endEditBlock();
+    } else {
+        priv->remove(pos1, pos2-pos1, op);
+        adjusted_anchor = anchor = position;
+        priv->finishEdit();
+    }
+
+}
+
+void QTextCursorPrivate::clearCells(QTextTable *table, int startRow, int startCol, int numRows, int numCols, QTextUndoCommand::Operation op)
+{
+    priv->beginEditBlock();
+
+    for (int row = startRow; row < startRow + numRows; ++row)
+        for (int col = startCol; col < startCol + numCols; ++col) {
+            QTextTableCell cell = table->cellAt(row, col);
+            const int startPos = cell.firstPosition();
+            const int endPos = cell.lastPosition();
+            Q_ASSERT(startPos <= endPos);
+            priv->remove(startPos, endPos - startPos, op);
+        }
+
+    priv->endEditBlock();
+}
+
+bool QTextCursorPrivate::canDelete(int pos) const
+{
+    QTextDocumentPrivate::FragmentIterator fit = priv->find(pos);
+    QTextCharFormat fmt = priv->formatCollection()->charFormat((*fit)->format);
+    return (fmt.objectIndex() == -1 || fmt.objectType() == QTextFormat::ImageObject);
+}
+
+void QTextCursorPrivate::insertBlock(const QTextBlockFormat &format, const QTextCharFormat &charFormat)
+{
+    QTextFormatCollection *formats = priv->formatCollection();
+    int idx = formats->indexForFormat(format);
+    Q_ASSERT(formats->format(idx).isBlockFormat());
+
+    priv->insertBlock(position, idx, formats->indexForFormat(charFormat));
+    currentCharFormat = -1;
+}
+
+void QTextCursorPrivate::adjustCursor(QTextCursor::MoveOperation m)
+{
+    adjusted_anchor = anchor;
+    if (position == anchor)
+        return;
+
+    QTextFrame *f_position = priv->frameAt(position);
+    QTextFrame *f_anchor = priv->frameAt(adjusted_anchor);
+
+    if (f_position != f_anchor) {
+        // find common parent frame
+        QList<QTextFrame *> positionChain;
+        QList<QTextFrame *> anchorChain;
+        QTextFrame *f = f_position;
+        while (f) {
+            positionChain.prepend(f);
+            f = f->parentFrame();
+        }
+        f = f_anchor;
+        while (f) {
+            anchorChain.prepend(f);
+            f = f->parentFrame();
+        }
+        Q_ASSERT(positionChain.at(0) == anchorChain.at(0));
+        int i = 1;
+        int l = qMin(positionChain.size(), anchorChain.size());
+        for (; i < l; ++i) {
+            if (positionChain.at(i) != anchorChain.at(i))
+                break;
+        }
+
+        if (m <= QTextCursor::WordLeft) {
+            if (i < positionChain.size())
+                position = positionChain.at(i)->firstPosition() - 1;
+        } else {
+            if (i < positionChain.size())
+                position = positionChain.at(i)->lastPosition() + 1;
+        }
+        if (position < adjusted_anchor) {
+            if (i < anchorChain.size())
+                adjusted_anchor = anchorChain.at(i)->lastPosition() + 1;
+        } else {
+            if (i < anchorChain.size())
+                adjusted_anchor = anchorChain.at(i)->firstPosition() - 1;
+        }
+
+        f_position = positionChain.at(i-1);
+    }
+
+    // same frame, either need to adjust to cell boundaries or return
+    QTextTable *table = qobject_cast<QTextTable *>(f_position);
+    if (!table)
+        return;
+
+    QTextTableCell c_position = table->cellAt(position);
+    QTextTableCell c_anchor = table->cellAt(adjusted_anchor);
+    if (c_position != c_anchor) {
+        bool before;
+        int col_position = c_position.column();
+        int col_anchor = c_anchor.column();
+        if (col_position == col_anchor) {
+            before = c_position.row() < c_anchor.row();
+        } else {
+            before = col_position < col_anchor;
+        }
+
+        // adjust to cell boundaries
+        if (m <= QTextCursor::WordLeft) {
+            position = c_position.firstPosition();
+            if (!before)
+                --position;
+        } else {
+            position = c_position.lastPosition();
+            if (before)
+                ++position;
+        }
+        if (position < adjusted_anchor)
+            adjusted_anchor = c_anchor.lastPosition();
+        else
+            adjusted_anchor = c_anchor.firstPosition();
+    }
+    currentCharFormat = -1;
+}
+
+void QTextCursorPrivate::aboutToRemoveCell(int from, int to)
+{
+    Q_ASSERT(from <= to);
+    if (position == anchor)
+        return;
+
+    QTextTable *t = qobject_cast<QTextTable *>(priv->frameAt(position));
+    if (!t)
+        return;
+    QTextTableCell removedCellFrom = t->cellAt(from);
+    QTextTableCell removedCellEnd = t->cellAt(to);
+    if (! removedCellFrom.isValid() || !removedCellEnd.isValid())
+        return;
+
+    int curFrom = position;
+    int curTo = adjusted_anchor;
+    if (curTo < curFrom)
+        qSwap(curFrom, curTo);
+
+    QTextTableCell cellStart = t->cellAt(curFrom);
+    QTextTableCell cellEnd = t->cellAt(curTo);
+
+    if (cellStart.row() >= removedCellFrom.row() && cellEnd.row() <= removedCellEnd.row()
+            && cellStart.column() >= removedCellFrom.column()
+              && cellEnd.column() <= removedCellEnd.column()) { // selection is completely removed
+        // find a new position, as close as possible to where we were.
+        QTextTableCell cell;
+        if (removedCellFrom.row() == 0 && removedCellEnd.row() == t->rows()-1) // removed n columns
+            cell = t->cellAt(cellStart.row(), removedCellEnd.column()+1);
+        else if (removedCellFrom.column() == 0 && removedCellEnd.column() == t->columns()-1) // removed n rows
+            cell = t->cellAt(removedCellEnd.row() + 1, cellStart.column());
+
+        int newPosition;
+        if (cell.isValid())
+            newPosition = cell.firstPosition();
+        else
+            newPosition = t->lastPosition()+1;
+
+        setPosition(newPosition);
+        anchor = newPosition;
+        adjusted_anchor = newPosition;
+        x = 0;
+    }
+    else if (cellStart.row() >= removedCellFrom.row() && cellStart.row() <= removedCellEnd.row()
+        && cellEnd.row() > removedCellEnd.row()) {
+        int newPosition = t->cellAt(removedCellEnd.row() + 1, cellStart.column()).firstPosition();
+        if (position < anchor)
+            position = newPosition;
+        else
+            anchor = adjusted_anchor = newPosition;
+    }
+    else if (cellStart.column() >= removedCellFrom.column() && cellStart.column() <= removedCellEnd.column()
+        && cellEnd.column() > removedCellEnd.column()) {
+        int newPosition = t->cellAt(cellStart.row(), removedCellEnd.column()+1).firstPosition();
+        if (position < anchor)
+            position = newPosition;
+        else
+            anchor = adjusted_anchor = newPosition;
+    }
+}
+
+bool QTextCursorPrivate::movePosition(QTextCursor::MoveOperation op, QTextCursor::MoveMode mode)
+{
+    currentCharFormat = -1;
+    bool adjustX = true;
+    QTextBlock blockIt = block();
+
+    if (!blockIt.isValid())
+        return false;
+
+    if (op >= QTextCursor::Left && op <= QTextCursor::WordRight
+        && blockIt.textDirection() == Qt::RightToLeft) {
+        if (op == QTextCursor::Left)
+            op = QTextCursor::NextCharacter;
+        else if (op == QTextCursor::Right)
+            op = QTextCursor::PreviousCharacter;
+        else if (op == QTextCursor::WordLeft)
+            op = QTextCursor::NextWord;
+        else if (op == QTextCursor::WordRight)
+            op = QTextCursor::PreviousWord;
+    }
+
+    const QTextLayout *layout = blockLayout(blockIt);
+    int relativePos = position - blockIt.position();
+    QTextLine line;
+    if (!priv->isInEditBlock())
+        line = layout->lineForTextPosition(relativePos);
+
+    Q_ASSERT(priv->frameAt(position) == priv->frameAt(adjusted_anchor));
+
+    int newPosition = position;
+
+    if (x == -1 && !priv->isInEditBlock() && (op == QTextCursor::Up || op == QTextCursor::Down))
+        setX();
+
+    switch(op) {
+    case QTextCursor::NoMove:
+        return true;
+
+    case QTextCursor::Start:
+        newPosition = 0;
+        break;
+    case QTextCursor::StartOfLine: {
+        newPosition = blockIt.position();
+        if (line.isValid())
+            newPosition += line.textStart();
+
+        break;
+    }
+    case QTextCursor::StartOfBlock: {
+        newPosition = blockIt.position();
+        break;
+    }
+    case QTextCursor::PreviousBlock: {
+        if (blockIt == priv->blocksBegin())
+            return false;
+        blockIt = blockIt.previous();
+
+        newPosition = blockIt.position();
+        break;
+    }
+    case QTextCursor::PreviousCharacter:
+    case QTextCursor::Left:
+        newPosition = priv->previousCursorPosition(position, QTextLayout::SkipCharacters);
+        break;
+    case QTextCursor::StartOfWord: {
+        if (relativePos == 0)
+            break;
+
+        // skip if already at word start
+        QTextEngine *engine = layout->engine();
+        engine->attributes();
+        if ((relativePos == blockIt.length() - 1)
+            && (engine->atSpace(relativePos - 1) || engine->atWordSeparator(relativePos - 1)))
+            return false;
+
+        if (relativePos < blockIt.length()-1)
+            ++position;
+
+        // FALL THROUGH!
+    }
+    case QTextCursor::PreviousWord:
+    case QTextCursor::WordLeft:
+        newPosition = priv->previousCursorPosition(position, QTextLayout::SkipWords);
+        break;
+    case QTextCursor::Up: {
+        int i = line.lineNumber() - 1;
+        if (i == -1) {
+            if (blockIt == priv->blocksBegin())
+                return false;
+            int blockPosition = blockIt.position();
+            QTextTable *table = qobject_cast<QTextTable *>(priv->frameAt(blockPosition));
+            if (table) {
+                QTextTableCell cell = table->cellAt(blockPosition);
+                if (cell.firstPosition() == blockPosition) {
+                    int row = cell.row() - 1;
+                    if (row >= 0) {
+                        blockPosition = table->cellAt(row, cell.column()).lastPosition();
+                    } else {
+                        // move to line above the table
+                        blockPosition = table->firstPosition() - 1;
+                    }
+                    blockIt = priv->blocksFind(blockPosition);
+                } else {
+                    blockIt = blockIt.previous();
+                }
+            } else {
+                blockIt = blockIt.previous();
+            }
+            layout = blockLayout(blockIt);
+            i = layout->lineCount()-1;
+        }
+        if (layout->lineCount()) {
+            QTextLine line = layout->lineAt(i);
+            newPosition = line.xToCursor(x) + blockIt.position();
+        } else {
+            newPosition = blockIt.position();
+        }
+        adjustX = false;
+        break;
+    }
+
+    case QTextCursor::End:
+        newPosition = priv->length() - 1;
+        break;
+    case QTextCursor::EndOfLine: {
+        if (!line.isValid() || line.textLength() == 0) {
+            if (blockIt.length() >= 1)
+                // position right before the block separator
+                newPosition = blockIt.position() + blockIt.length() - 1;
+            break;
+        }
+        newPosition = blockIt.position() + line.textStart() + line.textLength();
+        if (line.lineNumber() < layout->lineCount() - 1) {
+            const QString text = blockIt.text();
+            // ###### this relies on spaces being the cause for linebreaks.
+            // this doesn't work with japanese
+            if (text.at(line.textStart() + line.textLength() - 1).isSpace())
+                --newPosition;
+        }
+        break;
+    }
+    case QTextCursor::EndOfWord: {
+        QTextEngine *engine = layout->engine();
+        engine->attributes();
+        const int len = blockIt.length() - 1;
+        if (relativePos >= len)
+            return false;
+        if (engine->atWordSeparator(relativePos)) {
+            ++relativePos;
+            while (relativePos < len && engine->atWordSeparator(relativePos))
+                ++relativePos;
+        } else {
+            while (relativePos < len && !engine->atSpace(relativePos) && !engine->atWordSeparator(relativePos))
+                ++relativePos;
+        }
+        newPosition = blockIt.position() + relativePos;
+        break;
+    }
+    case QTextCursor::EndOfBlock:
+        if (blockIt.length() >= 1)
+            // position right before the block separator
+            newPosition = blockIt.position() + blockIt.length() - 1;
+        break;
+    case QTextCursor::NextBlock: {
+        blockIt = blockIt.next();
+        if (!blockIt.isValid())
+            return false;
+
+        newPosition = blockIt.position();
+        break;
+    }
+    case QTextCursor::NextCharacter:
+    case QTextCursor::Right:
+        newPosition = priv->nextCursorPosition(position, QTextLayout::SkipCharacters);
+        break;
+    case QTextCursor::NextWord:
+    case QTextCursor::WordRight:
+        newPosition = priv->nextCursorPosition(position, QTextLayout::SkipWords);
+        break;
+
+    case QTextCursor::Down: {
+        int i = line.lineNumber() + 1;
+
+        if (i >= layout->lineCount()) {
+            int blockPosition = blockIt.position() + blockIt.length() - 1;
+            QTextTable *table = qobject_cast<QTextTable *>(priv->frameAt(blockPosition));
+            if (table) {
+                QTextTableCell cell = table->cellAt(blockPosition);
+                if (cell.lastPosition() == blockPosition) {
+                    int row = cell.row() + cell.rowSpan();
+                    if (row < table->rows()) {
+                        blockPosition = table->cellAt(row, cell.column()).firstPosition();
+                    } else {
+                        // move to line below the table
+                        blockPosition = table->lastPosition() + 1;
+                    }
+                    blockIt = priv->blocksFind(blockPosition);
+                } else {
+                    blockIt = blockIt.next();
+                }
+            } else {
+                blockIt = blockIt.next();
+            }
+
+            if (blockIt == priv->blocksEnd())
+                return false;
+            layout = blockLayout(blockIt);
+            i = 0;
+        }
+        if (layout->lineCount()) {
+            QTextLine line = layout->lineAt(i);
+            newPosition = line.xToCursor(x) + blockIt.position();
+        } else {
+            newPosition = blockIt.position();
+        }
+        adjustX = false;
+        break;
+    }
+    case QTextCursor::NextCell: // fall through
+    case QTextCursor::PreviousCell: // fall through
+    case QTextCursor::NextRow: // fall through
+    case QTextCursor::PreviousRow: {
+        QTextTable *table = qobject_cast<QTextTable *>(priv->frameAt(position));
+        if (!table)
+            return false;
+
+        QTextTableCell cell = table->cellAt(position);
+        Q_ASSERT(cell.isValid());
+        int column = cell.column();
+        int row = cell.row();
+        const int currentRow = row;
+        if (op == QTextCursor::NextCell || op == QTextCursor::NextRow) {
+            do {
+                column += cell.columnSpan();
+                if (column >= table->columns()) {
+                    column = 0;
+                    ++row;
+                }
+                cell = table->cellAt(row, column);
+                // note we also continue while we have not reached a cell thats not merged with one above us
+            } while (cell.isValid()
+                    && ((op == QTextCursor::NextRow && currentRow == cell.row())
+                        || cell.row() < row));
+        }
+        else if (op == QTextCursor::PreviousCell || op == QTextCursor::PreviousRow) {
+            do {
+                --column;
+                if (column < 0) {
+                    column = table->columns()-1;
+                    --row;
+                }
+                cell = table->cellAt(row, column);
+                // note we also continue while we have not reached a cell thats not merged with one above us
+            } while (cell.isValid()
+                    && ((op == QTextCursor::PreviousRow && currentRow == cell.row())
+                        || cell.row() < row));
+        }
+        if (cell.isValid())
+            newPosition = cell.firstPosition();
+        break;
+    }
+    }
+
+    if (mode == QTextCursor::KeepAnchor) {
+        QTextTable *table = qobject_cast<QTextTable *>(priv->frameAt(position));
+        if (table && ((op >= QTextCursor::PreviousBlock && op <= QTextCursor::WordLeft)
+                      || (op >= QTextCursor::NextBlock && op <= QTextCursor::WordRight))) {
+            int oldColumn = table->cellAt(position).column();
+
+            const QTextTableCell otherCell = table->cellAt(newPosition);
+            if (!otherCell.isValid())
+                return false;
+
+            int newColumn = otherCell.column();
+            if ((oldColumn > newColumn && op >= QTextCursor::End)
+                || (oldColumn < newColumn && op <= QTextCursor::WordLeft))
+                return false;
+        }
+    }
+
+    const bool moved = setPosition(newPosition);
+
+    if (mode == QTextCursor::MoveAnchor) {
+        anchor = position;
+        adjusted_anchor = position;
+    } else {
+        adjustCursor(op);
+    }
+
+    if (adjustX)
+        setX();
+
+    return moved;
+}
+
+QTextTable *QTextCursorPrivate::complexSelectionTable() const
+{
+    if (position == anchor)
+        return 0;
+
+    QTextTable *t = qobject_cast<QTextTable *>(priv->frameAt(position));
+    if (t) {
+        QTextTableCell cell_pos = t->cellAt(position);
+        QTextTableCell cell_anchor = t->cellAt(adjusted_anchor);
+
+        Q_ASSERT(cell_anchor.isValid());
+
+        if (cell_pos == cell_anchor)
+            t = 0;
+    }
+    return t;
+}
+
+void QTextCursorPrivate::selectedTableCells(int *firstRow, int *numRows, int *firstColumn, int *numColumns) const
+{
+    *firstRow = -1;
+    *firstColumn = -1;
+    *numRows = -1;
+    *numColumns = -1;
+
+    if (position == anchor)
+        return;
+
+    QTextTable *t = qobject_cast<QTextTable *>(priv->frameAt(position));
+    if (!t)
+        return;
+
+    QTextTableCell cell_pos = t->cellAt(position);
+    QTextTableCell cell_anchor = t->cellAt(adjusted_anchor);
+
+    Q_ASSERT(cell_anchor.isValid());
+
+    if (cell_pos == cell_anchor)
+        return;
+
+    *firstRow = qMin(cell_pos.row(), cell_anchor.row());
+    *firstColumn = qMin(cell_pos.column(), cell_anchor.column());
+    *numRows = qMax(cell_pos.row() + cell_pos.rowSpan(), cell_anchor.row() + cell_anchor.rowSpan()) - *firstRow;
+    *numColumns = qMax(cell_pos.column() + cell_pos.columnSpan(), cell_anchor.column() + cell_anchor.columnSpan()) - *firstColumn;
+}
+
+static void setBlockCharFormatHelper(QTextDocumentPrivate *priv, int pos1, int pos2,
+                               const QTextCharFormat &format, QTextDocumentPrivate::FormatChangeMode changeMode)
+{
+    QTextBlock it = priv->blocksFind(pos1);
+    QTextBlock end = priv->blocksFind(pos2);
+    if (end.isValid())
+        end = end.next();
+
+    for (; it != end; it = it.next()) {
+        priv->setCharFormat(it.position() - 1, 1, format, changeMode);
+    }
+}
+
+void QTextCursorPrivate::setBlockCharFormat(const QTextCharFormat &_format,
+    QTextDocumentPrivate::FormatChangeMode changeMode)
+{
+    priv->beginEditBlock();
+
+    QTextCharFormat format = _format;
+    format.clearProperty(QTextFormat::ObjectIndex);
+
+    QTextTable *table = complexSelectionTable();
+    if (table) {
+        int row_start, col_start, num_rows, num_cols;
+        selectedTableCells(&row_start, &num_rows, &col_start, &num_cols);
+
+        Q_ASSERT(row_start != -1);
+        for (int r = row_start; r < row_start + num_rows; ++r) {
+            for (int c = col_start; c < col_start + num_cols; ++c) {
+                QTextTableCell cell = table->cellAt(r, c);
+                int rspan = cell.rowSpan();
+                int cspan = cell.columnSpan();
+                if (rspan != 1) {
+                    int cr = cell.row();
+                    if (cr != r)
+                        continue;
+                }
+                if (cspan != 1) {
+                    int cc = cell.column();
+                    if (cc != c)
+                        continue;
+                }
+
+                int pos1 = cell.firstPosition();
+                int pos2 = cell.lastPosition();
+                setBlockCharFormatHelper(priv, pos1, pos2, format, changeMode);
+            }
+        }
+    } else {
+        int pos1 = position;
+        int pos2 = adjusted_anchor;
+        if (pos1 > pos2) {
+            pos1 = adjusted_anchor;
+            pos2 = position;
+        }
+
+        setBlockCharFormatHelper(priv, pos1, pos2, format, changeMode);
+    }
+    priv->endEditBlock();
+}
+
+
+void QTextCursorPrivate::setBlockFormat(const QTextBlockFormat &format, QTextDocumentPrivate::FormatChangeMode changeMode)
+{
+    QTextTable *table = complexSelectionTable();
+    if (table) {
+        priv->beginEditBlock();
+        int row_start, col_start, num_rows, num_cols;
+        selectedTableCells(&row_start, &num_rows, &col_start, &num_cols);
+
+        Q_ASSERT(row_start != -1);
+        for (int r = row_start; r < row_start + num_rows; ++r) {
+            for (int c = col_start; c < col_start + num_cols; ++c) {
+                QTextTableCell cell = table->cellAt(r, c);
+                int rspan = cell.rowSpan();
+                int cspan = cell.columnSpan();
+                if (rspan != 1) {
+                    int cr = cell.row();
+                    if (cr != r)
+                        continue;
+                }
+                if (cspan != 1) {
+                    int cc = cell.column();
+                    if (cc != c)
+                        continue;
+                }
+
+                int pos1 = cell.firstPosition();
+                int pos2 = cell.lastPosition();
+                priv->setBlockFormat(priv->blocksFind(pos1), priv->blocksFind(pos2), format, changeMode);
+            }
+        }
+        priv->endEditBlock();
+    } else {
+        int pos1 = position;
+        int pos2 = adjusted_anchor;
+        if (pos1 > pos2) {
+            pos1 = adjusted_anchor;
+            pos2 = position;
+        }
+
+        priv->setBlockFormat(priv->blocksFind(pos1), priv->blocksFind(pos2), format, changeMode);
+    }
+}
+
+void QTextCursorPrivate::setCharFormat(const QTextCharFormat &_format, QTextDocumentPrivate::FormatChangeMode changeMode)
+{
+    Q_ASSERT(position != anchor);
+
+    QTextCharFormat format = _format;
+    format.clearProperty(QTextFormat::ObjectIndex);
+
+    QTextTable *table = complexSelectionTable();
+    if (table) {
+        priv->beginEditBlock();
+        int row_start, col_start, num_rows, num_cols;
+        selectedTableCells(&row_start, &num_rows, &col_start, &num_cols);
+
+        Q_ASSERT(row_start != -1);
+        for (int r = row_start; r < row_start + num_rows; ++r) {
+            for (int c = col_start; c < col_start + num_cols; ++c) {
+                QTextTableCell cell = table->cellAt(r, c);
+                int rspan = cell.rowSpan();
+                int cspan = cell.columnSpan();
+                if (rspan != 1) {
+                    int cr = cell.row();
+                    if (cr != r)
+                        continue;
+                }
+                if (cspan != 1) {
+                    int cc = cell.column();
+                    if (cc != c)
+                        continue;
+                }
+
+                int pos1 = cell.firstPosition();
+                int pos2 = cell.lastPosition();
+                priv->setCharFormat(pos1, pos2-pos1, format, changeMode);
+            }
+        }
+        priv->endEditBlock();
+    } else {
+        int pos1 = position;
+        int pos2 = adjusted_anchor;
+        if (pos1 > pos2) {
+            pos1 = adjusted_anchor;
+            pos2 = position;
+        }
+
+        priv->setCharFormat(pos1, pos2-pos1, format, changeMode);
+    }
+}
+
+
+QTextLayout *QTextCursorPrivate::blockLayout(QTextBlock &block) const{
+    QTextLayout *tl = block.layout();
+    if (!tl->lineCount() && priv->layout())
+        priv->layout()->blockBoundingRect(block);
+    return tl;
+}
+
+/*!
+    \class QTextCursor
+    \reentrant
+
+    \brief The QTextCursor class offers an API to access and modify QTextDocuments.
+
+    \ingroup richtext-processing
+    \ingroup shared
+
+    Text cursors are objects that are used to access and modify the
+    contents and underlying structure of text documents via a
+    programming interface that mimics the behavior of a cursor in a
+    text editor. QTextCursor contains information about both the
+    cursor's position within a QTextDocument and any selection that it
+    has made.
+
+    QTextCursor is modeled on the way a text cursor behaves in a text
+    editor, providing a programmatic means of performing standard
+    actions through the user interface. A document can be thought of
+    as a single string of characters. The cursor's current position()
+    then is always either \e between two consecutive characters in the
+    string, or else \e before the very first character or \e after the
+    very last character in the string.  Documents can also contain
+    tables, lists, images, and other objects in addition to text but,
+    from the developer's point of view, the document can be treated as
+    one long string.  Some portions of that string can be considered
+    to lie within particular blocks (e.g. paragraphs), or within a
+    table's cell, or a list's item, or other structural elements. When
+    we refer to "current character" we mean the character immediately
+    \e before the cursor position() in the document. Similarly, the
+    "current block" is the block that contains the cursor position().
+
+    A QTextCursor also has an anchor() position. The text that is
+    between the anchor() and the position() is the selection. If
+    anchor() == position() there is no selection.
+
+    The cursor position can be changed programmatically using
+    setPosition() and movePosition(); the latter can also be used to
+    select text. For selections see selectionStart(), selectionEnd(),
+    hasSelection(), clearSelection(), and removeSelectedText().
+
+    If the position() is at the start of a block atBlockStart()
+    returns true; and if it is at the end of a block atBlockEnd() returns
+    true. The format of the current character is returned by
+    charFormat(), and the format of the current block is returned by
+    blockFormat().
+
+    Formatting can be applied to the current text document using the
+    setCharFormat(), mergeCharFormat(), setBlockFormat() and
+    mergeBlockFormat() functions. The 'set' functions will replace the
+    cursor's current character or block format, while the 'merge'
+    functions add the given format properties to the cursor's current
+    format. If the cursor has a selection the given format is applied
+    to the current selection. Note that when only parts of a block is
+    selected the block format is applied to the entire block. The text
+    at the current character position can be turned into a list using
+    createList().
+
+    Deletions can be achieved using deleteChar(),
+    deletePreviousChar(), and removeSelectedText().
+
+    Text strings can be inserted into the document with the insertText()
+    function, blocks (representing new paragraphs) can be inserted with
+    insertBlock().
+
+    Existing fragments of text can be inserted with insertFragment() but,
+    if you want to insert pieces of text in various formats, it is usually
+    still easier to use insertText() and supply a character format.
+
+    Various types of higher-level structure can also be inserted into the
+    document with the cursor:
+
+    \list
+    \i Lists are ordered sequences of block elements that are decorated with
+       bullet points or symbols. These are inserted in a specified format
+       with insertList().
+    \i Tables are inserted with the insertTable() function, and can be
+       given an optional format. These contain an array of cells that can
+       be traversed using the cursor.
+    \i Inline images are inserted with insertImage(). The image to be
+       used can be specified in an image format, or by name.
+    \i Frames are inserted by calling insertFrame() with a specified format.
+    \endlist
+
+    Actions can be grouped (i.e. treated as a single action for
+    undo/redo) using beginEditBlock() and endEditBlock().
+
+    Cursor movements are limited to valid cursor positions. In Latin
+    writing this is between any two consecutive characters in the
+    text, before the first character, or after the last character. In
+    some other writing systems cursor movements are limited to
+    "clusters" (e.g. a syllable in Devanagari, or a base letter plus
+    diacritics).  Functions such as movePosition() and deleteChar()
+    limit cursor movement to these valid positions.
+
+    \sa \link richtext.html Rich Text Processing\endlink
+
+*/
+
+/*!
+    \enum QTextCursor::MoveOperation
+
+    \value NoMove Keep the cursor where it is
+
+    \value Start Move to the start of the document.
+    \value StartOfLine Move to the start of the current line.
+    \value StartOfBlock Move to the start of the current block.
+    \value StartOfWord Move to the start of the current word.
+    \value PreviousBlock Move to the start of the previous block.
+    \value PreviousCharacter Move to the previous character.
+    \value PreviousWord Move to the beginning of the previous word.
+    \value Up Move up one line.
+    \value Left Move left one character.
+    \value WordLeft Move left one word.
+
+    \value End Move to the end of the document.
+    \value EndOfLine Move to the end of the current line.
+    \value EndOfWord Move to the end of the current word.
+    \value EndOfBlock Move to the end of the current block.
+    \value NextBlock Move to the beginning of the next block.
+    \value NextCharacter Move to the next character.
+    \value NextWord Move to the next word.
+    \value Down Move down one line.
+    \value Right Move right one character.
+    \value WordRight Move right one word.
+
+    \value NextCell  Move to the beginning of the next table cell inside the
+           current table. If the current cell is the last cell in the row, the
+           cursor will move to the first cell in the next row.
+    \value PreviousCell  Move to the beginning of the previous table cell
+           inside the current table. If the current cell is the first cell in
+           the row, the cursor will move to the last cell in the previous row.
+    \value NextRow  Move to the first new cell of the next row in the current
+           table.
+    \value PreviousRow  Move to the last cell of the previous row in the
+           current table.
+
+    \sa movePosition()
+*/
+
+/*!
+    \enum QTextCursor::MoveMode
+
+    \value MoveAnchor Moves the anchor to the same position as the cursor itself.
+    \value KeepAnchor Keeps the anchor where it is.
+
+    If the anchor() is kept where it is and the position() is moved,
+    the text in between will be selected.
+*/
+
+/*!
+    \enum QTextCursor::SelectionType
+
+    This enum describes the types of selection that can be applied with the
+    select() function.
+
+    \value Document         Selects the entire document.
+    \value BlockUnderCursor Selects the block of text under the cursor.
+    \value LineUnderCursor  Selects the line of text under the cursor.
+    \value WordUnderCursor  Selects the word under the cursor. If the cursor
+           is not positioned within a string of selectable characters, no
+           text is selected.
+*/
+
+/*!
+    Constructs a null cursor.
+ */
+QTextCursor::QTextCursor()
+    : d(0)
+{
+}
+
+/*!
+    Constructs a cursor pointing to the beginning of the \a document.
+ */
+QTextCursor::QTextCursor(QTextDocument *document)
+    : d(new QTextCursorPrivate(document->docHandle()))
+{
+}
+
+/*!
+    Constructs a cursor pointing to the beginning of the \a frame.
+*/
+QTextCursor::QTextCursor(QTextFrame *frame)
+    : d(new QTextCursorPrivate(frame->document()->docHandle()))
+{
+    d->adjusted_anchor = d->anchor = d->position = frame->firstPosition();
+}
+
+
+/*!
+    Constructs a cursor pointing to the beginning of the \a block.
+*/
+QTextCursor::QTextCursor(const QTextBlock &block)
+    : d(new QTextCursorPrivate(block.docHandle()))
+{
+    d->adjusted_anchor = d->anchor = d->position = block.position();
+}
+
+
+/*!
+  \internal
+ */
+QTextCursor::QTextCursor(QTextDocumentPrivate *p, int pos)
+    : d(new QTextCursorPrivate(p))
+{
+    d->adjusted_anchor = d->anchor = d->position = pos;
+
+    d->setX();
+}
+
+/*!
+    \internal
+*/
+QTextCursor::QTextCursor(QTextCursorPrivate *d)
+{
+    Q_ASSERT(d);
+    this->d = d;
+}
+
+/*!
+    Constructs a new cursor that is a copy of \a cursor.
+ */
+QTextCursor::QTextCursor(const QTextCursor &cursor)
+{
+    d = cursor.d;
+}
+
+/*!
+    Makes a copy of \a cursor and assigns it to this QTextCursor. Note
+    that QTextCursor is an \l{Implicitly Shared Classes}{implicitly
+    shared} class.
+
+ */
+QTextCursor &QTextCursor::operator=(const QTextCursor &cursor)
+{
+    d = cursor.d;
+    return *this;
+}
+
+/*!
+    Destroys the QTextCursor.
+ */
+QTextCursor::~QTextCursor()
+{
+}
+
+/*!
+    Returns true if the cursor is null; otherwise returns false. A null
+    cursor is created by the default constructor.
+ */
+bool QTextCursor::isNull() const
+{
+    return !d || !d->priv;
+}
+
+/*!
+    Moves the cursor to the absolute position in the document specified by
+    \a pos using a \c MoveMode specified by \a m. The cursor is positioned
+    between characters.
+
+    \sa position() movePosition() anchor()
+*/
+void QTextCursor::setPosition(int pos, MoveMode m)
+{
+    if (!d || !d->priv)
+        return;
+
+    if (pos < 0 || pos >= d->priv->length()) {
+        qWarning("QTextCursor::setPosition: Position '%d' out of range", pos);
+        return;
+    }
+
+    d->setPosition(pos);
+    if (m == MoveAnchor) {
+        d->anchor = pos;
+        d->adjusted_anchor = pos;
+    } else { // keep anchor
+        QTextCursor::MoveOperation op;
+        if (pos < d->anchor)
+            op = QTextCursor::Left;
+        else
+            op = QTextCursor::Right;
+        d->adjustCursor(op);
+    }
+    d->setX();
+}
+
+/*!
+    Returns the absolute position of the cursor within the document.
+    The cursor is positioned between characters.
+
+    \sa setPosition() movePosition() anchor() positionInBlock()
+*/
+int QTextCursor::position() const
+{
+    if (!d || !d->priv)
+        return -1;
+    return d->position;
+}
+
+/*!
+    \since 4.7
+    Returns the relative position of the cursor within the block.
+    The cursor is positioned between characters.
+
+    This is equivalent to \c{ position() - block().position()}.
+
+    \sa position()
+*/
+int QTextCursor::positionInBlock() const
+{
+    if (!d || !d->priv)
+        return 0;
+    return d->position - d->block().position();
+}
+
+/*!
+    Returns the anchor position; this is the same as position() unless
+    there is a selection in which case position() marks one end of the
+    selection and anchor() marks the other end. Just like the cursor
+    position, the anchor position is between characters.
+
+    \sa position() setPosition() movePosition() selectionStart() selectionEnd()
+*/
+int QTextCursor::anchor() const
+{
+    if (!d || !d->priv)
+        return -1;
+    return d->anchor;
+}
+
+/*!
+    \fn bool QTextCursor::movePosition(MoveOperation operation, MoveMode mode, int n)
+
+    Moves the cursor by performing the given \a operation \a n times, using the specified
+    \a mode, and returns true if all operations were completed successfully; otherwise
+    returns false.
+
+    For example, if this function is repeatedly used to seek to the end of the next
+    word, it will eventually fail when the end of the document is reached.
+
+    By default, the move operation is performed once (\a n = 1).
+
+    If \a mode is \c KeepAnchor, the cursor selects the text it moves
+    over. This is the same effect that the user achieves when they
+    hold down the Shift key and move the cursor with the cursor keys.
+
+    \sa setVisualNavigation()
+*/
+bool QTextCursor::movePosition(MoveOperation op, MoveMode mode, int n)
+{
+    if (!d || !d->priv)
+        return false;
+    switch (op) {
+    case Start:
+    case StartOfLine:
+    case End:
+    case EndOfLine:
+        n = 1;
+        break;
+    default: break;
+    }
+
+    int previousPosition = d->position;
+    for (; n > 0; --n) {
+        if (!d->movePosition(op, mode))
+            return false;
+    }
+
+    if (d->visualNavigation && !d->block().isVisible()) {
+        QTextBlock b = d->block();
+        if (previousPosition < d->position) {
+            while (!b.next().isVisible())
+                b = b.next();
+            d->setPosition(b.position() + b.length() - 1);
+        } else {
+            while (!b.previous().isVisible())
+                b = b.previous();
+            d->setPosition(b.position());
+        }
+        if (mode == QTextCursor::MoveAnchor)
+            d->anchor = d->position;
+        while (d->movePosition(op, mode)
+               && !d->block().isVisible())
+            ;
+
+    }
+    return true;
+}
+
+/*!
+  \since 4.4
+
+  Returns true if the cursor does visual navigation; otherwise
+  returns false.
+
+  Visual navigation means skipping over hidden text pragraphs. The
+  default is false.
+
+  \sa setVisualNavigation(), movePosition()
+ */
+bool QTextCursor::visualNavigation() const
+{
+    return d ? d->visualNavigation : false;
+}
+
+/*!
+  \since 4.4
+
+  Sets visual navigation to \a b.
+
+  Visual navigation means skipping over hidden text pragraphs. The
+  default is false.
+
+  \sa visualNavigation(), movePosition()
+ */
+void QTextCursor::setVisualNavigation(bool b)
+{
+    if (d)
+        d->visualNavigation = b;
+}
+
+
+/*!
+  \since 4.7
+
+  Sets the visual x position for vertical cursor movements to \a x.
+
+  The vertical movement x position is cleared automatically when the cursor moves horizontally, and kept
+  unchanged when the cursor moves vertically. The mechanism allows the cursor to move up and down on a
+  visually straight line with proportional fonts, and to gently "jump" over short lines.
+
+  A value of -1 indicates no predefined x position. It will then be set automatically the next time the
+  cursor moves up or down.
+
+  \sa verticalMovementX()
+  */
+void QTextCursor::setVerticalMovementX(int x)
+{
+    if (d)
+        d->x = x;
+}
+
+/*! \since 4.7
+
+  Returns the visual x position for vertical cursor movements.
+
+  A value of -1 indicates no predefined x position. It will then be set automatically the next time the
+  cursor moves up or down.
+
+  \sa setVerticalMovementX()
+  */
+int QTextCursor::verticalMovementX() const
+{
+    return d ? d->x : -1;
+}
+
+/*!
+  \since 4.7
+
+  Returns whether the cursor should keep its current position when text gets inserted at the position of the
+  cursor.
+
+  The default is false;
+
+  \sa setKeepPositionOnInsert()
+ */
+bool QTextCursor::keepPositionOnInsert() const
+{
+    return d ? d->keepPositionOnInsert : false;
+}
+
+/*!
+  \since 4.7
+
+  Defines whether the cursor should keep its current position when text gets inserted at the current position of the
+  cursor.
+
+  If \a b is true, the cursor keeps its current position when text gets inserted at the positing of the cursor.
+  If \a b is false, the cursor moves along with the inserted text.
+
+  The default is false.
+
+  Note that a cursor always moves when text is inserted before the current position of the cursor, and it
+  always keeps its position when text is inserted after the current position of the cursor.
+
+  \sa keepPositionOnInsert()
+ */
+void QTextCursor::setKeepPositionOnInsert(bool b)
+{
+    if (d)
+        d->keepPositionOnInsert = b;
+}
+
+
+
+/*!
+    Inserts \a text at the current position, using the current
+    character format.
+
+    If there is a selection, the selection is deleted and replaced by
+    \a text, for example:
+    \snippet doc/src/snippets/code/src_gui_text_qtextcursor.cpp 0
+    This clears any existing selection, selects the word at the cursor
+    (i.e. from position() forward), and replaces the selection with
+    the phrase "Hello World".
+
+    Any ASCII linefeed characters (\\n) in the inserted text are transformed
+    into unicode block separators, corresponding to insertBlock() calls.
+
+    \sa charFormat() hasSelection()
+*/
+void QTextCursor::insertText(const QString &text)
+{
+    QTextCharFormat fmt = charFormat();
+    fmt.clearProperty(QTextFormat::ObjectType);
+    insertText(text, fmt);
+}
+
+/*!
+    \fn void QTextCursor::insertText(const QString &text, const QTextCharFormat &format)
+    \overload
+
+    Inserts \a text at the current position with the given \a format.
+*/
+void QTextCursor::insertText(const QString &text, const QTextCharFormat &_format)
+{
+    if (!d || !d->priv)
+        return;
+
+    Q_ASSERT(_format.isValid());
+
+    QTextCharFormat format = _format;
+    format.clearProperty(QTextFormat::ObjectIndex);
+
+    bool hasEditBlock = false;
+
+    if (d->anchor != d->position) {
+        hasEditBlock = true;
+        d->priv->beginEditBlock();
+        d->remove();
+    }
+
+    if (!text.isEmpty()) {
+        QTextFormatCollection *formats = d->priv->formatCollection();
+        int formatIdx = formats->indexForFormat(format);
+        Q_ASSERT(formats->format(formatIdx).isCharFormat());
+
+        QTextBlockFormat blockFmt = blockFormat();
+
+
+        int textStart = d->priv->text.length();
+        int blockStart = 0;
+        d->priv->text += text;
+        int textEnd = d->priv->text.length();
+
+        for (int i = 0; i < text.length(); ++i) {
+            QChar ch = text.at(i);
+
+            const int blockEnd = i;
+
+            if (ch == QLatin1Char('\r')
+                && (i + 1) < text.length()
+                && text.at(i + 1) == QLatin1Char('\n')) {
+                ++i;
+                ch = text.at(i);
+            }
+
+            if (ch == QLatin1Char('\n')
+                || ch == QChar::ParagraphSeparator
+                || ch == QTextBeginningOfFrame
+                || ch == QTextEndOfFrame
+                || ch == QLatin1Char('\r')) {
+
+                if (!hasEditBlock) {
+                    hasEditBlock = true;
+                    d->priv->beginEditBlock();
+                }
+
+                if (blockEnd > blockStart)
+                    d->priv->insert(d->position, textStart + blockStart, blockEnd - blockStart, formatIdx);
+
+                d->insertBlock(blockFmt, format);
+                blockStart = i + 1;
+            }
+        }
+        if (textStart + blockStart < textEnd)
+            d->priv->insert(d->position, textStart + blockStart, textEnd - textStart - blockStart, formatIdx);
+    }
+    if (hasEditBlock)
+        d->priv->endEditBlock();
+    d->setX();
+}
+
+/*!
+    If there is no selected text, deletes the character \e at the
+    current cursor position; otherwise deletes the selected text.
+
+    \sa deletePreviousChar() hasSelection() clearSelection()
+*/
+void QTextCursor::deleteChar()
+{
+    if (!d || !d->priv)
+        return;
+
+    if (d->position != d->anchor) {
+        removeSelectedText();
+        return;
+    }
+
+    if (!d->canDelete(d->position))
+        return;
+    d->adjusted_anchor = d->anchor =
+                         d->priv->nextCursorPosition(d->anchor, QTextLayout::SkipCharacters);
+    d->remove();
+    d->setX();
+}
+
+/*!
+    If there is no selected text, deletes the character \e before the
+    current cursor position; otherwise deletes the selected text.
+
+    \sa deleteChar() hasSelection() clearSelection()
+*/
+void QTextCursor::deletePreviousChar()
+{
+    if (!d || !d->priv)
+        return;
+
+    if (d->position != d->anchor) {
+        removeSelectedText();
+        return;
+    }
+
+    if (d->anchor < 1 || !d->canDelete(d->anchor-1))
+        return;
+    d->anchor--;
+
+    QTextDocumentPrivate::FragmentIterator fragIt = d->priv->find(d->anchor);
+    const QTextFragmentData * const frag = fragIt.value();
+    int fpos = fragIt.position();
+    QChar uc = d->priv->buffer().at(d->anchor - fpos + frag->stringPosition);
+    if (d->anchor > fpos && uc.unicode() >= 0xdc00 && uc.unicode() < 0xe000) {
+        // second half of a surrogate, check if we have the first half as well,
+        // if yes delete both at once
+        uc = d->priv->buffer().at(d->anchor - 1 - fpos + frag->stringPosition);
+        if (uc.unicode() >= 0xd800 && uc.unicode() < 0xdc00)
+            --d->anchor;
+    }
+
+    d->adjusted_anchor = d->anchor;
+    d->remove();
+    d->setX();
+}
+
+/*!
+    Selects text in the document according to the given \a selection.
+*/
+void QTextCursor::select(SelectionType selection)
+{
+    if (!d || !d->priv)
+        return;
+
+    clearSelection();
+
+    const QTextBlock block = d->block();
+
+    switch (selection) {
+        case LineUnderCursor:
+            movePosition(StartOfLine);
+            movePosition(EndOfLine, KeepAnchor);
+            break;
+        case WordUnderCursor:
+            movePosition(StartOfWord);
+            movePosition(EndOfWord, KeepAnchor);
+            break;
+        case BlockUnderCursor:
+            if (block.length() == 1) // no content
+                break;
+            movePosition(StartOfBlock);
+            // also select the paragraph separator
+            if (movePosition(PreviousBlock)) {
+                movePosition(EndOfBlock);
+                movePosition(NextBlock, KeepAnchor);
+            }
+            movePosition(EndOfBlock, KeepAnchor);
+            break;
+        case Document:
+            movePosition(Start);
+            movePosition(End, KeepAnchor);
+            break;
+    }
+}
+
+/*!
+    Returns true if the cursor contains a selection; otherwise returns false.
+*/
+bool QTextCursor::hasSelection() const
+{
+    return !!d && d->position != d->anchor;
+}
+
+
+/*!
+    Returns true if the cursor contains a selection that is not simply a
+    range from selectionStart() to selectionEnd(); otherwise returns false.
+
+    Complex selections are ones that span at least two cells in a table;
+    their extent is specified by selectedTableCells().
+*/
+bool QTextCursor::hasComplexSelection() const
+{
+    if (!d)
+        return false;
+
+    return d->complexSelectionTable() != 0;
+}
+
+/*!
+    If the selection spans over table cells, \a firstRow is populated
+    with the number of the first row in the selection, \a firstColumn
+    with the number of the first column in the selection, and \a
+    numRows and \a numColumns with the number of rows and columns in
+    the selection. If the selection does not span any table cells the
+    results are harmless but undefined.
+*/
+void QTextCursor::selectedTableCells(int *firstRow, int *numRows, int *firstColumn, int *numColumns) const
+{
+    *firstRow = -1;
+    *firstColumn = -1;
+    *numRows = -1;
+    *numColumns = -1;
+
+    if (!d || d->position == d->anchor)
+        return;
+
+    d->selectedTableCells(firstRow, numRows, firstColumn, numColumns);
+}
+
+
+/*!
+    Clears the current selection by setting the anchor to the cursor position.
+
+    Note that it does \bold{not} delete the text of the selection.
+
+    \sa removeSelectedText() hasSelection()
+*/
+void QTextCursor::clearSelection()
+{
+    if (!d)
+        return;
+    d->adjusted_anchor = d->anchor = d->position;
+    d->currentCharFormat = -1;
+}
+
+/*!
+    If there is a selection, its content is deleted; otherwise does
+    nothing.
+
+    \sa hasSelection()
+*/
+void QTextCursor::removeSelectedText()
+{
+    if (!d || !d->priv || d->position == d->anchor)
+        return;
+
+    d->priv->beginEditBlock();
+    d->remove();
+    d->priv->endEditBlock();
+    d->setX();
+}
+
+/*!
+    Returns the start of the selection or position() if the
+    cursor doesn't have a selection.
+
+    \sa selectionEnd() position() anchor()
+*/
+int QTextCursor::selectionStart() const
+{
+    if (!d || !d->priv)
+        return -1;
+    return qMin(d->position, d->adjusted_anchor);
+}
+
+/*!
+    Returns the end of the selection or position() if the cursor
+    doesn't have a selection.
+
+    \sa selectionStart() position() anchor()
+*/
+int QTextCursor::selectionEnd() const
+{
+    if (!d || !d->priv)
+        return -1;
+    return qMax(d->position, d->adjusted_anchor);
+}
+
+static void getText(QString &text, QTextDocumentPrivate *priv, const QString &docText, int pos, int end)
+{
+    while (pos < end) {
+        QTextDocumentPrivate::FragmentIterator fragIt = priv->find(pos);
+        const QTextFragmentData * const frag = fragIt.value();
+
+        const int offsetInFragment = qMax(0, pos - fragIt.position());
+        const int len = qMin(int(frag->size_array[0] - offsetInFragment), end - pos);
+
+        text += QString(docText.constData() + frag->stringPosition + offsetInFragment, len);
+        pos += len;
+    }
+}
+
+/*!
+    Returns the current selection's text (which may be empty). This
+    only returns the text, with no rich text formatting information.
+    If you want a document fragment (i.e. formatted rich text) use
+    selection() instead.
+
+    \note If the selection obtained from an editor spans a line break,
+    the text will contain a Unicode U+2029 paragraph separator character
+    instead of a newline \c{\n} character. Use QString::replace() to
+    replace these characters with newlines.
+*/
+QString QTextCursor::selectedText() const
+{
+    if (!d || !d->priv || d->position == d->anchor)
+        return QString();
+
+    const QString docText = d->priv->buffer();
+    QString text;
+
+    QTextTable *table = d->complexSelectionTable();
+    if (table) {
+        int row_start, col_start, num_rows, num_cols;
+        selectedTableCells(&row_start, &num_rows, &col_start, &num_cols);
+
+        Q_ASSERT(row_start != -1);
+        for (int r = row_start; r < row_start + num_rows; ++r) {
+            for (int c = col_start; c < col_start + num_cols; ++c) {
+                QTextTableCell cell = table->cellAt(r, c);
+                int rspan = cell.rowSpan();
+                int cspan = cell.columnSpan();
+                if (rspan != 1) {
+                    int cr = cell.row();
+                    if (cr != r)
+                        continue;
+                }
+                if (cspan != 1) {
+                    int cc = cell.column();
+                    if (cc != c)
+                        continue;
+                }
+
+                getText(text, d->priv, docText, cell.firstPosition(), cell.lastPosition());
+            }
+        }
+    } else {
+        getText(text, d->priv, docText, selectionStart(), selectionEnd());
+    }
+
+    return text;
+}
+
+/*!
+    Returns the current selection (which may be empty) with all its
+    formatting information. If you just want the selected text (i.e.
+    plain text) use selectedText() instead.
+
+    \note Unlike QTextDocumentFragment::toPlainText(),
+    selectedText() may include special unicode characters such as
+    QChar::ParagraphSeparator.
+
+    \sa QTextDocumentFragment::toPlainText()
+*/
+QTextDocumentFragment QTextCursor::selection() const
+{
+    return QTextDocumentFragment(*this);
+}
+
+/*!
+    Returns the block that contains the cursor.
+*/
+QTextBlock QTextCursor::block() const
+{
+    if (!d || !d->priv)
+        return QTextBlock();
+    return d->block();
+}
+
+/*!
+    Returns the block format of the block the cursor is in.
+
+    \sa setBlockFormat() charFormat()
+ */
+QTextBlockFormat QTextCursor::blockFormat() const
+{
+    if (!d || !d->priv)
+        return QTextBlockFormat();
+
+    return d->block().blockFormat();
+}
+
+/*!
+    Sets the block format of the current block (or all blocks that
+    are contained in the selection) to \a format.
+
+    \sa blockFormat(), mergeBlockFormat()
+*/
+void QTextCursor::setBlockFormat(const QTextBlockFormat &format)
+{
+    if (!d || !d->priv)
+        return;
+
+    d->setBlockFormat(format, QTextDocumentPrivate::SetFormat);
+}
+
+/*!
+    Modifies the block format of the current block (or all blocks that
+    are contained in the selection) with the block format specified by
+    \a modifier.
+
+    \sa setBlockFormat(), blockFormat()
+*/
+void QTextCursor::mergeBlockFormat(const QTextBlockFormat &modifier)
+{
+    if (!d || !d->priv)
+        return;
+
+    d->setBlockFormat(modifier, QTextDocumentPrivate::MergeFormat);
+}
+
+/*!
+    Returns the block character format of the block the cursor is in.
+
+    The block char format is the format used when inserting text at the
+    beginning of an empty block.
+
+    \sa setBlockCharFormat()
+ */
+QTextCharFormat QTextCursor::blockCharFormat() const
+{
+    if (!d || !d->priv)
+        return QTextCharFormat();
+
+    return d->block().charFormat();
+}
+
+/*!
+    Sets the block char format of the current block (or all blocks that
+    are contained in the selection) to \a format.
+
+    \sa blockCharFormat()
+*/
+void QTextCursor::setBlockCharFormat(const QTextCharFormat &format)
+{
+    if (!d || !d->priv)
+        return;
+
+    d->setBlockCharFormat(format, QTextDocumentPrivate::SetFormatAndPreserveObjectIndices);
+}
+
+/*!
+    Modifies the block char format of the current block (or all blocks that
+    are contained in the selection) with the block format specified by
+    \a modifier.
+
+    \sa setBlockCharFormat()
+*/
+void QTextCursor::mergeBlockCharFormat(const QTextCharFormat &modifier)
+{
+    if (!d || !d->priv)
+        return;
+
+    d->setBlockCharFormat(modifier, QTextDocumentPrivate::MergeFormat);
+}
+
+/*!
+    Returns the format of the character immediately before the cursor
+    position(). If the cursor is positioned at the beginning of a text
+    block that is not empty then the format of the character
+    immediately after the cursor is returned.
+
+    \sa insertText(), blockFormat()
+ */
+QTextCharFormat QTextCursor::charFormat() const
+{
+    if (!d || !d->priv)
+        return QTextCharFormat();
+
+    int idx = d->currentCharFormat;
+    if (idx == -1) {
+        QTextBlock block = d->block();
+
+        int pos;
+        if (d->position == block.position()
+            && block.length() > 1)
+            pos = d->position;
+        else
+            pos = d->position - 1;
+
+        if (pos == -1) {
+            idx = d->priv->blockCharFormatIndex(d->priv->blockMap().firstNode());
+        } else {
+            Q_ASSERT(pos >= 0 && pos < d->priv->length());
+
+            QTextDocumentPrivate::FragmentIterator it = d->priv->find(pos);
+            Q_ASSERT(!it.atEnd());
+            idx = it.value()->format;
+        }
+    }
+
+    QTextCharFormat cfmt = d->priv->formatCollection()->charFormat(idx);
+    cfmt.clearProperty(QTextFormat::ObjectIndex);
+
+    Q_ASSERT(cfmt.isValid());
+    return cfmt;
+}
+
+/*!
+    Sets the cursor's current character format to the given \a
+    format. If the cursor has a selection, the given \a format is
+    applied to the current selection.
+
+    \sa hasSelection(), mergeCharFormat()
+*/
+void QTextCursor::setCharFormat(const QTextCharFormat &format)
+{
+    if (!d || !d->priv)
+        return;
+    if (d->position == d->anchor) {
+        d->currentCharFormat = d->priv->formatCollection()->indexForFormat(format);
+        return;
+    }
+    d->setCharFormat(format, QTextDocumentPrivate::SetFormatAndPreserveObjectIndices);
+}
+
+/*!
+    Merges the cursor's current character format with the properties
+    described by format \a modifier. If the cursor has a selection,
+    this function applies all the properties set in \a modifier to all
+    the character formats that are part of the selection.
+
+    \sa hasSelection(), setCharFormat()
+*/
+void QTextCursor::mergeCharFormat(const QTextCharFormat &modifier)
+{
+    if (!d || !d->priv)
+        return;
+    if (d->position == d->anchor) {
+        QTextCharFormat format = charFormat();
+        format.merge(modifier);
+        d->currentCharFormat = d->priv->formatCollection()->indexForFormat(format);
+        return;
+    }
+
+    d->setCharFormat(modifier, QTextDocumentPrivate::MergeFormat);
+}
+
+/*!
+    Returns true if the cursor is at the start of a block; otherwise
+    returns false.
+
+    \sa atBlockEnd(), atStart()
+*/
+bool QTextCursor::atBlockStart() const
+{
+    if (!d || !d->priv)
+        return false;
+
+    return d->position == d->block().position();
+}
+
+/*!
+    Returns true if the cursor is at the end of a block; otherwise
+    returns false.
+
+    \sa atBlockStart(), atEnd()
+*/
+bool QTextCursor::atBlockEnd() const
+{
+    if (!d || !d->priv)
+        return false;
+
+    return d->position == d->block().position() + d->block().length() - 1;
+}
+
+/*!
+    Returns true if the cursor is at the start of the document;
+    otherwise returns false.
+
+    \sa atBlockStart(), atEnd()
+*/
+bool QTextCursor::atStart() const
+{
+    if (!d || !d->priv)
+        return false;
+
+    return d->position == 0;
+}
+
+/*!
+    \since 4.6
+
+    Returns true if the cursor is at the end of the document;
+    otherwise returns false.
+
+    \sa atStart(), atBlockEnd()
+*/
+bool QTextCursor::atEnd() const
+{
+    if (!d || !d->priv)
+        return false;
+
+    return d->position == d->priv->length() - 1;
+}
+
+/*!
+    Inserts a new empty block at the cursor position() with the
+    current blockFormat() and charFormat().
+
+    \sa setBlockFormat()
+*/
+void QTextCursor::insertBlock()
+{
+    insertBlock(blockFormat());
+}
+
+/*!
+    \overload
+
+    Inserts a new empty block at the cursor position() with block
+    format \a format and the current charFormat() as block char format.
+
+    \sa setBlockFormat()
+*/
+void QTextCursor::insertBlock(const QTextBlockFormat &format)
+{
+    QTextCharFormat charFmt = charFormat();
+    charFmt.clearProperty(QTextFormat::ObjectType);
+    insertBlock(format, charFmt);
+}
+
+/*!
+    \fn void QTextCursor::insertBlock(const QTextBlockFormat &format, const QTextCharFormat &charFormat)
+    \overload
+
+    Inserts a new empty block at the cursor position() with block
+    format \a format and \a charFormat as block char format.
+
+    \sa setBlockFormat()
+*/
+void QTextCursor::insertBlock(const QTextBlockFormat &format, const QTextCharFormat &_charFormat)
+{
+    if (!d || !d->priv)
+        return;
+
+    QTextCharFormat charFormat = _charFormat;
+    charFormat.clearProperty(QTextFormat::ObjectIndex);
+
+    d->priv->beginEditBlock();
+    d->remove();
+    d->insertBlock(format, charFormat);
+    d->priv->endEditBlock();
+    d->setX();
+}
+
+/*!
+    Inserts a new block at the current position and makes it the first
+    list item of a newly created list with the given \a format. Returns
+    the created list.
+
+    \sa currentList() createList() insertBlock()
+ */
+QTextList *QTextCursor::insertList(const QTextListFormat &format)
+{
+    insertBlock();
+    return createList(format);
+}
+
+/*!
+    \overload
+
+    Inserts a new block at the current position and makes it the first
+    list item of a newly created list with the given \a style. Returns
+    the created list.
+
+    \sa currentList(), createList(), insertBlock()
+ */
+QTextList *QTextCursor::insertList(QTextListFormat::Style style)
+{
+    insertBlock();
+    return createList(style);
+}
+
+/*!
+    Creates and returns a new list with the given \a format, and makes the
+    current paragraph the cursor is in the first list item.
+
+    \sa insertList() currentList()
+ */
+QTextList *QTextCursor::createList(const QTextListFormat &format)
+{
+    if (!d || !d->priv)
+        return 0;
+
+    QTextList *list = static_cast<QTextList *>(d->priv->createObject(format));
+    QTextBlockFormat modifier;
+    modifier.setObjectIndex(list->objectIndex());
+    mergeBlockFormat(modifier);
+    return list;
+}
+
+/*!
+    \overload
+
+    Creates and returns a new list with the given \a style, making the
+    cursor's current paragraph the first list item.
+
+    The style to be used is defined by the QTextListFormat::Style enum.
+
+    \sa insertList() currentList()
+ */
+QTextList *QTextCursor::createList(QTextListFormat::Style style)
+{
+    QTextListFormat fmt;
+    fmt.setStyle(style);
+    return createList(fmt);
+}
+
+/*!
+    Returns the current list if the cursor position() is inside a
+    block that is part of a list; otherwise returns 0.
+
+    \sa insertList() createList()
+ */
+QTextList *QTextCursor::currentList() const
+{
+    if (!d || !d->priv)
+        return 0;
+
+    QTextBlockFormat b = blockFormat();
+    QTextObject *o = d->priv->objectForFormat(b);
+    return qobject_cast<QTextList *>(o);
+}
+
+/*!
+    \fn QTextTable *QTextCursor::insertTable(int rows, int columns)
+
+    \overload
+
+    Creates a new table with the given number of \a rows and \a columns,
+    inserts it at the current cursor position() in the document, and returns
+    the table object. The cursor is moved to the beginning of the first cell.
+
+    There must be at least one row and one column in the table.
+
+    \sa currentTable()
+ */
+QTextTable *QTextCursor::insertTable(int rows, int cols)
+{
+    return insertTable(rows, cols, QTextTableFormat());
+}
+
+/*!
+    \fn QTextTable *QTextCursor::insertTable(int rows, int columns, const QTextTableFormat &format)
+
+    Creates a new table with the given number of \a rows and \a columns
+    in the specified \a format, inserts it at the current cursor position()
+    in the document, and returns the table object. The cursor is moved to
+    the beginning of the first cell.
+
+    There must be at least one row and one column in the table.
+
+    \sa currentTable()
+*/
+QTextTable *QTextCursor::insertTable(int rows, int cols, const QTextTableFormat &format)
+{
+    if(!d || !d->priv || rows == 0 || cols == 0)
+        return 0;
+
+    int pos = d->position;
+    QTextTable *t = QTextTablePrivate::createTable(d->priv, d->position, rows, cols, format);
+    d->setPosition(pos+1);
+    // ##### what should we do if we have a selection?
+    d->anchor = d->position;
+    d->adjusted_anchor = d->anchor;
+    return t;
+}
+
+/*!
+    Returns a pointer to the current table if the cursor position()
+    is inside a block that is part of a table; otherwise returns 0.
+
+    \sa insertTable()
+*/
+QTextTable *QTextCursor::currentTable() const
+{
+    if(!d || !d->priv)
+        return 0;
+
+    QTextFrame *frame = d->priv->frameAt(d->position);
+    while (frame) {
+        QTextTable *table = qobject_cast<QTextTable *>(frame);
+        if (table)
+            return table;
+        frame = frame->parentFrame();
+    }
+    return 0;
+}
+
+/*!
+    Inserts a frame with the given \a format at the current cursor position(),
+    moves the cursor position() inside the frame, and returns the frame.
+
+    If the cursor holds a selection, the whole selection is moved inside the
+    frame.
+
+    \sa hasSelection()
+*/
+QTextFrame *QTextCursor::insertFrame(const QTextFrameFormat &format)
+{
+    if (!d || !d->priv)
+        return 0;
+
+    return d->priv->insertFrame(selectionStart(), selectionEnd(), format);
+}
+
+/*!
+    Returns a pointer to the current frame. Returns 0 if the cursor is invalid.
+
+    \sa insertFrame()
+*/
+QTextFrame *QTextCursor::currentFrame() const
+{
+    if(!d || !d->priv)
+        return 0;
+
+    return d->priv->frameAt(d->position);
+}
+
+
+/*!
+    Inserts the text \a fragment at the current position().
+*/
+void QTextCursor::insertFragment(const QTextDocumentFragment &fragment)
+{
+    if (!d || !d->priv || fragment.isEmpty())
+        return;
+
+    d->priv->beginEditBlock();
+    d->remove();
+    fragment.d->insert(*this);
+    d->priv->endEditBlock();
+
+    if (fragment.d && fragment.d->doc)
+        d->priv->mergeCachedResources(fragment.d->doc->docHandle());
+}
+
+/*!
+    \since 4.2
+    Inserts the text \a html at the current position(). The text is interpreted as
+    HTML.
+
+    \note When using this function with a style sheet, the style sheet will
+    only apply to the current block in the document. In order to apply a style
+    sheet throughout a document, use QTextDocument::setDefaultStyleSheet()
+    instead.
+*/
+
+#ifndef QT_NO_TEXTHTMLPARSER
+
+void QTextCursor::insertHtml(const QString &html)
+{
+    if (!d || !d->priv)
+        return;
+    QTextDocumentFragment fragment = QTextDocumentFragment::fromHtml(html, d->priv->document());
+    insertFragment(fragment);
+}
+
+#endif // QT_NO_TEXTHTMLPARSER
+
+/*!
+    \overload
+    \since 4.2
+
+    Inserts the image defined by the given \a format at the cursor's current position
+    with the specified \a alignment.
+
+    \sa position()
+*/
+void QTextCursor::insertImage(const QTextImageFormat &format, QTextFrameFormat::Position alignment)
+{
+    if (!d || !d->priv)
+        return;
+
+    QTextFrameFormat ffmt;
+    ffmt.setPosition(alignment);
+    QTextObject *obj = d->priv->createObject(ffmt);
+
+    QTextImageFormat fmt = format;
+    fmt.setObjectIndex(obj->objectIndex());
+
+    d->priv->beginEditBlock();
+    d->remove();
+    const int idx = d->priv->formatCollection()->indexForFormat(fmt);
+    d->priv->insert(d->position, QString(QChar(QChar::ObjectReplacementCharacter)), idx);
+    d->priv->endEditBlock();
+}
+
+/*!
+    Inserts the image defined by \a format at the current position().
+*/
+void QTextCursor::insertImage(const QTextImageFormat &format)
+{
+    insertText(QString(QChar::ObjectReplacementCharacter), format);
+}
+
+/*!
+    \overload
+
+    Convenience method for inserting the image with the given \a name at the
+    current position().
+
+    \snippet doc/src/snippets/code/src_gui_text_qtextcursor.cpp 1
+*/
+void QTextCursor::insertImage(const QString &name)
+{
+    QTextImageFormat format;
+    format.setName(name);
+    insertImage(format);
+}
+
+/*!
+    \since 4.5
+    \overload
+
+    Convenience function for inserting the given \a image with an optional
+    \a name at the current position().
+*/
+void QTextCursor::insertImage(const QImage &image, const QString &name)
+{
+    if (image.isNull()) {
+        qWarning("QTextCursor::insertImage: attempt to add an invalid image");
+        return;
+    }
+    QString imageName = name;
+    if (name.isEmpty())
+        imageName = QString::number(image.serialNumber());
+    d->priv->document()->addResource(QTextDocument::ImageResource, QUrl(imageName), image);
+    QTextImageFormat format;
+    format.setName(imageName);
+    insertImage(format);
+}
+
+/*!
+    \fn bool QTextCursor::operator!=(const QTextCursor &other) const
+
+    Returns true if the \a other cursor is at a different position in
+    the document as this cursor; otherwise returns false.
+*/
+bool QTextCursor::operator!=(const QTextCursor &rhs) const
+{
+    return !operator==(rhs);
+}
+
+/*!
+    \fn bool QTextCursor::operator<(const QTextCursor &other) const
+
+    Returns true if the \a other cursor is positioned later in the
+    document than this cursor; otherwise returns false.
+*/
+bool QTextCursor::operator<(const QTextCursor &rhs) const
+{
+    if (!d)
+        return !!rhs.d;
+
+    if (!rhs.d)
+        return false;
+
+    Q_ASSERT_X(d->priv == rhs.d->priv, "QTextCursor::operator<", "cannot compare cursors attached to different documents");
+
+    return d->position < rhs.d->position;
+}
+
+/*!
+    \fn bool QTextCursor::operator<=(const QTextCursor &other) const
+
+    Returns true if the \a other cursor is positioned later or at the
+    same position in the document as this cursor; otherwise returns
+    false.
+*/
+bool QTextCursor::operator<=(const QTextCursor &rhs) const
+{
+    if (!d)
+        return true;
+
+    if (!rhs.d)
+        return false;
+
+    Q_ASSERT_X(d->priv == rhs.d->priv, "QTextCursor::operator<=", "cannot compare cursors attached to different documents");
+
+    return d->position <= rhs.d->position;
+}
+
+/*!
+    \fn bool QTextCursor::operator==(const QTextCursor &other) const
+
+    Returns true if the \a other cursor is at the same position in the
+    document as this cursor; otherwise returns false.
+*/
+bool QTextCursor::operator==(const QTextCursor &rhs) const
+{
+    if (!d)
+        return !rhs.d;
+
+    if (!rhs.d)
+        return false;
+
+    return d->position == rhs.d->position && d->priv == rhs.d->priv;
+}
+
+/*!
+    \fn bool QTextCursor::operator>=(const QTextCursor &other) const
+
+    Returns true if the \a other cursor is positioned earlier or at the
+    same position in the document as this cursor; otherwise returns
+    false.
+*/
+bool QTextCursor::operator>=(const QTextCursor &rhs) const
+{
+    if (!d)
+        return false;
+
+    if (!rhs.d)
+        return true;
+
+    Q_ASSERT_X(d->priv == rhs.d->priv, "QTextCursor::operator>=", "cannot compare cursors attached to different documents");
+
+    return d->position >= rhs.d->position;
+}
+
+/*!
+    \fn bool QTextCursor::operator>(const QTextCursor &other) const
+
+    Returns true if the \a other cursor is positioned earlier in the
+    document than this cursor; otherwise returns false.
+*/
+bool QTextCursor::operator>(const QTextCursor &rhs) const
+{
+    if (!d)
+        return false;
+
+    if (!rhs.d)
+        return true;
+
+    Q_ASSERT_X(d->priv == rhs.d->priv, "QTextCursor::operator>", "cannot compare cursors attached to different documents");
+
+    return d->position > rhs.d->position;
+}
+
+/*!
+    Indicates the start of a block of editing operations on the
+    document that should appear as a single operation from an
+    undo/redo point of view.
+
+    For example:
+
+    \snippet doc/src/snippets/code/src_gui_text_qtextcursor.cpp 2
+
+    The call to undo() will cause both insertions to be undone,
+    causing both "World" and "Hello" to be removed.
+
+    It is possible to nest calls to beginEditBlock and endEditBlock. The
+    top-most pair will determine the scope of the undo/redo operation.
+
+    \sa endEditBlock()
+ */
+void QTextCursor::beginEditBlock()
+{
+    if (!d || !d->priv)
+        return;
+
+    if (d->priv->editBlock == 0) // we are the initial edit block, store current cursor position for undo
+        d->priv->editBlockCursorPosition = d->position;
+
+    d->priv->beginEditBlock();
+}
+
+/*!
+    Like beginEditBlock() indicates the start of a block of editing operations
+    that should appear as a single operation for undo/redo. However unlike
+    beginEditBlock() it does not start a new block but reverses the previous call to
+    endEditBlock() and therefore makes following operations part of the previous edit block created.
+
+    For example:
+
+    \snippet doc/src/snippets/code/src_gui_text_qtextcursor.cpp 3
+
+    The call to undo() will cause all three insertions to be undone.
+
+    \sa beginEditBlock(), endEditBlock()
+ */
+void QTextCursor::joinPreviousEditBlock()
+{
+    if (!d || !d->priv)
+        return;
+
+    d->priv->joinPreviousEditBlock();
+}
+
+/*!
+    Indicates the end of a block of editing operations on the document
+    that should appear as a single operation from an undo/redo point
+    of view.
+
+    \sa beginEditBlock()
+ */
+
+void QTextCursor::endEditBlock()
+{
+    if (!d || !d->priv)
+        return;
+
+    d->priv->endEditBlock();
+}
+
+/*!
+    Returns true if this cursor and \a other are copies of each other, i.e.
+    one of them was created as a copy of the other and neither has moved since.
+    This is much stricter than equality.
+
+    \sa operator=() operator==()
+*/
+bool QTextCursor::isCopyOf(const QTextCursor &other) const
+{
+    return d == other.d;
+}
+
+/*!
+    \since 4.2
+    Returns the number of the block the cursor is in, or 0 if the cursor is invalid.
+
+    Note that this function only makes sense in documents without complex objects such
+    as tables or frames.
+*/
+int QTextCursor::blockNumber() const
+{
+    if (!d || !d->priv)
+        return 0;
+
+    return d->block().blockNumber();
+}
+
+
+/*!
+    \since 4.2
+    Returns the position of the cursor within its containing line.
+
+    Note that this is the column number relative to a wrapped line,
+    not relative to the block (i.e. the paragraph).
+
+    You probably want to call positionInBlock() instead.
+
+    \sa positionInBlock()
+*/
+int QTextCursor::columnNumber() const
+{
+    if (!d || !d->priv)
+        return 0;
+
+    QTextBlock block = d->block();
+    if (!block.isValid())
+        return 0;
+
+    const QTextLayout *layout = d->blockLayout(block);
+
+    const int relativePos = d->position - block.position();
+
+    if (layout->lineCount() == 0)
+        return relativePos;
+
+    QTextLine line = layout->lineForTextPosition(relativePos);
+    if (!line.isValid())
+        return 0;
+    return relativePos - line.textStart();
+}
+
+/*!
+    \since 4.5
+    Returns the document this cursor is associated with.
+*/
+QTextDocument *QTextCursor::document() const
+{
+    if (d->priv)
+        return d->priv->document();
+    return 0; // document went away
+}
+
+QT_END_NAMESPACE