C++ QTextFrame::d_func方法代码示例

void QTextFramePrivate::remove_me()
{
    Q_Q(QTextFrame);
    if (fragment_start == 0 && fragment_end == 0
        && !parentFrame) {
        q->document()->docHandle()->deleteObject(q);
        return;
    }

    if (!parentFrame)
        return;

    int index = parentFrame->d_func()->childFrames.indexOf(q);

    // iterator over all children and move them to the parent
    for (int i = 0; i < childFrames.size(); ++i) {
        QTextFrame *c = childFrames.at(i);
        parentFrame->d_func()->childFrames.insert(index, c);
        c->d_func()->parentFrame = parentFrame;
        ++index;
    }
    Q_ASSERT(parentFrame->d_func()->childFrames.at(index) == q);
    parentFrame->d_func()->childFrames.removeAt(index);

    childFrames.clear();
    parentFrame = 0;
}

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;
}

void QTextDocumentPrivate::insert_string(int pos, uint strPos, uint length, int format, QTextUndoCommand::Operation op)
{
    // ##### optimise when only appending to the fragment!
    Q_ASSERT(noBlockInString(text.mid(strPos, length)));

    split(pos);
    uint x = fragments.insert_single(pos, length);
    QTextFragmentData *X = fragments.fragment(x);
    X->format = format;
    X->stringPosition = strPos;
    uint w = fragments.previous(x);
    if (w)
        unite(w);

    int b = blocks.findNode(pos);
    blocks.setSize(b, blocks.size(b)+length);

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

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

    adjustDocumentChangesAndCursors(pos, length, op);
}

QTextFrame *QTextDocumentPrivate::insertFrame(int start, int end, const QTextFrameFormat &format)
{
    Q_ASSERT(start >= 0 && start < length());
    Q_ASSERT(end >= 0 && end < length());
    Q_ASSERT(start <= end || end == -1);

    if (start != end && frameAt(start) != frameAt(end))
        return 0;

    beginEditBlock();

    QTextFrame *frame = qobject_cast<QTextFrame *>(createObject(format));
    Q_ASSERT(frame);

    // #### using the default block and char format below might be wrong
    int idx = formats.indexForFormat(QTextBlockFormat());
    QTextCharFormat cfmt;
    cfmt.setObjectIndex(frame->objectIndex());
    int charIdx = formats.indexForFormat(cfmt);

    insertBlock(QTextBeginningOfFrame, start, idx, charIdx, QTextUndoCommand::MoveCursor);
    insertBlock(QTextEndOfFrame, ++end, idx, charIdx, QTextUndoCommand::KeepCursor);

    frame->d_func()->fragment_start = find(start).n;
    frame->d_func()->fragment_end = find(end).n;

    insert_frame(frame);

    endEditBlock();

    return frame;
}

void QTextDocumentPrivate::insert_frame(QTextFrame *f)
{
    int start = f->firstPosition();
    int end = f->lastPosition();
    QTextFrame *parent = frameAt(start-1);
    Q_ASSERT(parent == frameAt(end+1));

    if (start != end) {
        // iterator over the parent and move all children contained in my frame to myself
        for (int i = 0; i < parent->d_func()->childFrames.size(); ++i) {
            QTextFrame *c = parent->d_func()->childFrames.at(i);
            if (start < c->firstPosition() && end > c->lastPosition()) {
                parent->d_func()->childFrames.removeAt(i);
                f->d_func()->childFrames.append(c);
                c->d_func()->parentFrame = f;
            }
        }
    }
    // insert at the correct position
    int i = 0;
    for (; i < parent->d_func()->childFrames.size(); ++i) {
        QTextFrame *c = parent->d_func()->childFrames.at(i);
        if (c->firstPosition() > end)
            break;
    }
    parent->d_func()->childFrames.insert(i, f);
    f->d_func()->parentFrame = parent;
}

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;
}

int QTextDocumentPrivate::insert_block(int pos, uint strPos, int format, int blockFormat, QTextUndoCommand::Operation op, int command)
{
    split(pos);
    uint x = fragments.insert_single(pos, 1);
    QTextFragmentData *X = fragments.fragment(x);
    X->format = format;
    X->stringPosition = strPos;
    // no need trying to unite, since paragraph separators are always in a fragment of their own

    Q_ASSERT(isValidBlockSeparator(text.at(strPos)));
    Q_ASSERT(blocks.length()+1 == fragments.length());

    int block_pos = pos;
    if (blocks.length() && command == QTextUndoCommand::BlockRemoved)
        ++block_pos;
    int size = 1;
    int n = blocks.findNode(block_pos);
    int key = n ? blocks.position(n) : blocks.length();

    Q_ASSERT(n || (!n && block_pos == blocks.length()));
    if (key != block_pos) {
        Q_ASSERT(key < block_pos);
        int oldSize = blocks.size(n);
        blocks.setSize(n, block_pos-key);
        size += oldSize - (block_pos-key);
    }
    int b = blocks.insert_single(block_pos, size);
    QTextBlockData *B = blocks.fragment(b);
    B->format = blockFormat;

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

    QTextBlockGroup *group = qobject_cast<QTextBlockGroup *>(objectForFormat(blockFormat));
    if (group)
        group->blockInserted(QTextBlock(this, b));

    QTextFrame *frame = qobject_cast<QTextFrame *>(objectForFormat(formats.format(format)));
    if (frame) {
        frame->d_func()->fragmentAdded(text.at(strPos), x);
        framesDirty = true;
    }

    adjustDocumentChangesAndCursors(pos, 1, op);
    return x;
}

void QTextDocumentPrivate::scan_frames(int pos, int charsRemoved, int charsAdded)
{
    // ###### optimise
    Q_UNUSED(pos);
    Q_UNUSED(charsRemoved);
    Q_UNUSED(charsAdded);

    QTextFrame *f = rootFrame();
    clearFrame(f);

    for (FragmentIterator it = begin(); it != end(); ++it) {
        // QTextFormat fmt = formats.format(it->format);
        QTextFrame *frame = qobject_cast<QTextFrame *>(objectForFormat(it->format));
        if (!frame)
            continue;

        Q_ASSERT(it.size() == 1);
        QChar ch = text.at(it->stringPosition);

        if (ch == QTextBeginningOfFrame) {
            if (f != frame) {
                // f == frame happens for tables
                Q_ASSERT(frame->d_func()->fragment_start == it.n || frame->d_func()->fragment_start == 0);
                frame->d_func()->parentFrame = f;
                f->d_func()->childFrames.append(frame);
                f = frame;
            }
        } else if (ch == QTextEndOfFrame) {
            Q_ASSERT(f == frame);
            Q_ASSERT(frame->d_func()->fragment_end == it.n || frame->d_func()->fragment_end == 0);
            f = frame->d_func()->parentFrame;
        } else if (ch == QChar::ObjectReplacementCharacter) {
            Q_ASSERT(f != frame);
            Q_ASSERT(frame->d_func()->fragment_start == it.n || frame->d_func()->fragment_start == 0);
            Q_ASSERT(frame->d_func()->fragment_end == it.n || frame->d_func()->fragment_end == 0);
            frame->d_func()->parentFrame = f;
            f->d_func()->childFrames.append(frame);
        } else {
            Q_ASSERT(false);
        }
    }
    Q_ASSERT(f == rtFrame);
    framesDirty = false;
}