qtextdocument_p.cpp

奇趣公司比较新的qt/emd版本

    QTextUndoCommand c = { QTextUndoCommand::BlockInserted, true,
                      op, charFormat, strPos, pos, { blockFormat } };

    appendUndoItem(c);
    Q_ASSERT(undoState == undoStack.size());

    if (formats.charFormat(charFormat).objectIndex() == -1)
        ensureMaximumBlockCount();

    endEditBlock();
    return fragment;
}

int QTextDocumentPrivate::insertBlock(int pos, int blockFormat, int charFormat, QTextUndoCommand::Operation op)
{
    return insertBlock(QChar::ParagraphSeparator, pos, blockFormat, charFormat, op);
}

void QTextDocumentPrivate::insert(int pos, int strPos, int strLength, int format)
{
    if (strLength <= 0)
        return;

    Q_ASSERT(pos >= 0 && pos < fragments.length());
    Q_ASSERT(formats.format(format).isCharFormat());

    insert_string(pos, strPos, strLength, format, QTextUndoCommand::MoveCursor);

    beginEditBlock();

    QTextUndoCommand c = { QTextUndoCommand::Inserted, true,
                      QTextUndoCommand::MoveCursor, format, strPos, pos, { strLength } };
    appendUndoItem(c);
    Q_ASSERT(undoState == undoStack.size());

    endEditBlock();
}

void QTextDocumentPrivate::insert(int pos, const QString &str, int format)
{
    if (str.size() == 0)
        return;

    Q_ASSERT(noBlockInString(str));

    int strPos = text.length();
    text.append(str);
    insert(pos, strPos, str.length(), format);
}

int QTextDocumentPrivate::remove_string(int pos, uint length, QTextUndoCommand::Operation op)
{
    Q_ASSERT(pos >= 0);
    Q_ASSERT(blocks.length() == fragments.length());
    Q_ASSERT(blocks.length() >= pos+(int)length);

    int b = blocks.findNode(pos);
    uint x = fragments.findNode(pos);

    Q_ASSERT(blocks.size(b) > length);
    Q_ASSERT(x && fragments.position(x) == (uint)pos && fragments.size(x) == length);
    Q_ASSERT(noBlockInString(text.mid(fragments.fragment(x)->stringPosition, length)));

    blocks.setSize(b, blocks.size(b)-length);

    QTextFrame *frame = qobject_cast<QTextFrame *>(objectForFormat(fragments.fragment(x)->format));
    if (frame) {
        frame->d_func()->fragmentRemoved(text.at(fragments.fragment(x)->stringPosition), x);
        framesDirty = true;
    }

    const int w = fragments.erase_single(x);

    if (!undoEnabled)
        unreachableCharacterCount += length;

    adjustDocumentChangesAndCursors(pos, -int(length), op);

    return w;
}

int QTextDocumentPrivate::remove_block(int pos, int *blockFormat, int command, QTextUndoCommand::Operation op)
{
    Q_ASSERT(pos >= 0);
    Q_ASSERT(blocks.length() == fragments.length());
    Q_ASSERT(blocks.length() > pos);

    int b = blocks.findNode(pos);
    uint x = fragments.findNode(pos);

    Q_ASSERT(x && (int)fragments.position(x) == pos);
    Q_ASSERT(fragments.size(x) == 1);
    Q_ASSERT(isValidBlockSeparator(text.at(fragments.fragment(x)->stringPosition)));
    Q_ASSERT(b);

    if (blocks.size(b) == 1 && command == QTextUndoCommand::BlockAdded) {
	Q_ASSERT((int)blocks.position(b) == pos);
//  	qDebug("removing empty block");
	// empty block remove the block itself
    } else {
	// non empty block, merge with next one into this block
//  	qDebug("merging block with next");
	int n = blocks.next(b);
	Q_ASSERT((int)blocks.position(n) == pos + 1);
	blocks.setSize(b, blocks.size(b) + blocks.size(n) - 1);
	b = n;
    }
    *blockFormat = blocks.fragment(b)->format;

    QTextBlockGroup *group = qobject_cast<QTextBlockGroup *>(objectForFormat(blocks.fragment(b)->format));
    if (group)
        group->blockRemoved(QTextBlock(this, b));

    QTextFrame *frame = qobject_cast<QTextFrame *>(objectForFormat(fragments.fragment(x)->format));
    if (frame) {
        frame->d_func()->fragmentRemoved(text.at(fragments.fragment(x)->stringPosition), x);
        framesDirty = true;
    }

    blocks.erase_single(b);
    const int w = fragments.erase_single(x);

    adjustDocumentChangesAndCursors(pos, -1, op);

    return w;
}

#if !defined(QT_NO_DEBUG)
static bool isAncestorFrame(QTextFrame *possibleAncestor, QTextFrame *child)
{
    while (child) {
        if (child == possibleAncestor)
            return true;
        child = child->parentFrame();
    }
    return false;
}
#endif

void QTextDocumentPrivate::move(int pos, int to, int length, QTextUndoCommand::Operation op)
{
    Q_ASSERT(to <= fragments.length() && to <= pos);
    Q_ASSERT(pos >= 0 && pos+length <= fragments.length());
    Q_ASSERT(blocks.length() == fragments.length());

    if (pos == to)
        return;

    bool needsInsert = to != -1;

#if !defined(QT_NO_DEBUG)
    const bool startAndEndInSameFrame = (frameAt(pos) == frameAt(pos + length - 1));

    const bool endIsEndOfChildFrame = (isAncestorFrame(frameAt(pos), frameAt(pos + length - 1))
                                       && text.at(find(pos + length - 1)->stringPosition) == QTextEndOfFrame);

    const bool startIsStartOfFrameAndEndIsEndOfFrameWithCommonParent
               = (text.at(find(pos)->stringPosition) == QTextBeginningOfFrame
                  && text.at(find(pos + length - 1)->stringPosition) == QTextEndOfFrame
                  && frameAt(pos)->parentFrame() == frameAt(pos + length - 1)->parentFrame());

    const bool isFirstTableCell = (qobject_cast<QTextTable *>(frameAt(pos + length - 1))
                                  && frameAt(pos + length - 1)->parentFrame() == frameAt(pos));

    Q_ASSERT(startAndEndInSameFrame || endIsEndOfChildFrame || startIsStartOfFrameAndEndIsEndOfFrameWithCommonParent || isFirstTableCell);
#endif

    beginEditBlock();

    split(pos);
    split(pos+length);

    uint dst = needsInsert ? fragments.findNode(to) : 0;
    uint dstKey = needsInsert ? fragments.position(dst) : 0;

    uint x = fragments.findNode(pos);
    uint end = fragments.findNode(pos+length);

    uint w = 0;
    while (x != end) {
        uint n = fragments.next(x);

        uint key = fragments.position(x);
        uint b = blocks.findNode(key+1);

        QTextFragmentData *X = fragments.fragment(x);
        QTextUndoCommand c = { QTextUndoCommand::Removed, true,
                          op, X->format, X->stringPosition, key, { X->size } };
        QTextUndoCommand cInsert = { QTextUndoCommand::Inserted, true,
                          op, X->format, X->stringPosition, dstKey, { X->size } };

        if (key+1 != blocks.position(b)) {
//	    qDebug("remove_string from %d length %d", key, X->size);
            Q_ASSERT(noBlockInString(text.mid(X->stringPosition, X->size)));
            w = remove_string(key, X->size, op);

            if (needsInsert) {
                insert_string(dstKey, X->stringPosition, X->size, X->format, op);
                dstKey += X->size;
            }
        } else {
//	    qDebug("remove_block at %d", key);
            Q_ASSERT(X->size == 1 && isValidBlockSeparator(text.at(X->stringPosition)));
            b = blocks.previous(b);
            c.command = blocks.size(b) == 1 ? QTextUndoCommand::BlockDeleted : QTextUndoCommand::BlockRemoved;
            w = remove_block(key, &c.blockFormat, QTextUndoCommand::BlockAdded, op);

            if (needsInsert) {
                insert_block(dstKey++, X->stringPosition, X->format, c.blockFormat, op, QTextUndoCommand::BlockRemoved);
                cInsert.command = blocks.size(b) == 1 ? QTextUndoCommand::BlockAdded : QTextUndoCommand::BlockInserted;
                cInsert.blockFormat = c.blockFormat;
            }
        }
        appendUndoItem(c);
        x = n;

        if (needsInsert)
            appendUndoItem(cInsert);
    }
    if (w)
        unite(w);

    Q_ASSERT(blocks.length() == fragments.length());

    endEditBlock();
}

void QTextDocumentPrivate::remove(int pos, int length, QTextUndoCommand::Operation op)
{
    move(pos, -1, length, op);
}

void QTextDocumentPrivate::setCharFormat(int pos, int length, const QTextCharFormat &newFormat, FormatChangeMode mode)
{
    beginEditBlock();

    Q_ASSERT(newFormat.isValid());

    int newFormatIdx = -1;
    if (mode == SetFormatAndPreserveObjectIndices) {
        QTextCharFormat cleanFormat = newFormat;
        cleanFormat.clearProperty(QTextFormat::ObjectIndex);
        newFormatIdx = formats.indexForFormat(cleanFormat);
    } else if (mode == SetFormat) {
        newFormatIdx = formats.indexForFormat(newFormat);
    }

    if (pos == -1) {
        if (mode == MergeFormat) {
            QTextFormat format = formats.format(initialBlockCharFormatIndex);
            format.merge(newFormat);
            initialBlockCharFormatIndex = formats.indexForFormat(format);
        } else if (mode == SetFormatAndPreserveObjectIndices
                   && formats.format(initialBlockCharFormatIndex).objectIndex() != -1) {
            QTextCharFormat f = newFormat;
            f.setObjectIndex(formats.format(initialBlockCharFormatIndex).objectIndex());
            initialBlockCharFormatIndex = formats.indexForFormat(f);
        } else {
            initialBlockCharFormatIndex = newFormatIdx;
        }

        ++pos;
        --length;
    }

    const int startPos = pos;
    const int endPos = pos + length;

    split(startPos);
    split(endPos);

    while (pos < endPos) {
        FragmentMap::Iterator it = fragments.find(pos);
        Q_ASSERT(!it.atEnd());

        QTextFragmentData *fragment = it.value();

        Q_ASSERT(formats.format(fragment->format).type() == QTextFormat::CharFormat);

        int offset = pos - it.position();
        int length = qMin(endPos - pos, int(fragment->size - offset));
        int oldFormat = fragment->format;

        if (mode == MergeFormat) {
            QTextFormat format = formats.format(fragment->format);
            format.merge(newFormat);
            fragment->format = formats.indexForFormat(format);
        } else if (mode == SetFormatAndPreserveObjectIndices
                   && formats.format(oldFormat).objectIndex() != -1) {
            QTextCharFormat f = newFormat;
            f.setObjectIndex(formats.format(oldFormat).objectIndex());
            fragment->format = formats.indexForFormat(f);
        } else {
            fragment->format = newFormatIdx;
        }

        QTextUndoCommand c = { QTextUndoCommand::CharFormatChanged, true, QTextUndoCommand::MoveCursor, oldFormat,
                          0, pos, { length } };
        appendUndoItem(c);

        pos += length;
        Q_ASSERT(pos == (int)(it.position() + fragment->size) || pos >= endPos);
    }

    int n = fragments.findNode(startPos - 1);
    if (n)
        unite(n);

    n = fragments.findNode(endPos);
    if (n)
        unite(n);

    QTextBlock blockIt = blocksFind(startPos);
    QTextBlock endIt = blocksFind(endPos);
    if (endIt.isValid())
        endIt = endIt.next();
    for (; blockIt.isValid() && blockIt != endIt; blockIt = blockIt.next())
        QTextDocumentPrivate::block(blockIt)->invalidate();

    documentChange(startPos, length);

    endEditBlock();
}

void QTextDocumentPrivate::setBlockFormat(const QTextBlock &from, const QTextBlock &to,
				     const QTextBlockFormat &newFormat, FormatChangeMode mode)
{
    beginEditBlock();

    Q_ASSERT(mode != SetFormatAndPreserveObjectIndices); // only implemented for setCharFormat

    Q_ASSERT(newFormat.isValid());

    int newFormatIdx = -1;
    if (mode == SetFormat)
        newFormatIdx = formats.indexForFormat(newFormat);
    QTextBlockGroup *group = qobject_cast<QTextBlockGroup *>(objectForFormat(newFormat));

    QTextBlock it = from;
    QTextBlock end = to;
    if (end.isValid())
	end = end.next();

    for (; it != end; it = it.next()) {
        int oldFormat = block(it)->format;
        QTextBlockFormat format = formats.blockFormat(oldFormat);
        QTextBlockGroup *oldGroup = qobject_cast<QTextBlockGroup *>(objectForFormat(format));
        if (mode == MergeFormat) {
            format.merge(newFormat);
            newFormatIdx = formats.indexForFormat(format);
            group = qobject_cast<QTextBlockGroup *>(objectForFormat(format));
        }
        block(it)->format = newFormatIdx;

        block(it)->invalidate();

        QTextUndoCommand c = { QTextUndoCommand::BlockFormatChanged, true, QTextUndoCommand::MoveCursor, oldFormat,
                              0, it.position(), { 1 } };
        appendUndoItem(c);

        if (group != oldGroup) {
            if (oldGroup)
                oldGroup->blockRemoved(it);
            if (group)
                group->blockInserted(it);
        } else if (group) {
	    group->blockFormatChanged(it);
	}
    }

    documentChange(from.position(), to.position() + to.length() - from.position());

    endEditBlock();