qtextdocument_p.cpp

奇趣公司比较新的qt/emd版本

}


bool QTextDocumentPrivate::split(int pos)
{
    uint x = fragments.findNode(pos);
    if (x) {
        int k = fragments.position(x);
//          qDebug("found fragment with key %d, size_left=%d, size=%d to split at %d",
//                k, (*it)->size_left, (*it)->size, pos);
        if (k != pos) {
            Q_ASSERT(k <= pos);
            // need to resize the first fragment and add a new one
            QTextFragmentData *X = fragments.fragment(x);
            int oldsize = X->size;
            fragments.setSize(x, pos-k);
            uint n = fragments.insert_single(pos, oldsize-(pos-k));
            X = fragments.fragment(x);
            QTextFragmentData *N = fragments.fragment(n);
            N->stringPosition = X->stringPosition + pos-k;
            N->format = X->format;
            return true;
        }
    }
    return false;
}

bool QTextDocumentPrivate::unite(uint f)
{
    uint n = fragments.next(f);
    if (!n)
        return false;

    QTextFragmentData *ff = fragments.fragment(f);
    QTextFragmentData *nf = fragments.fragment(n);

    if (nf->format == ff->format && (ff->stringPosition + (int)ff->size == nf->stringPosition)) {
        if (isValidBlockSeparator(text.at(ff->stringPosition))
            || isValidBlockSeparator(text.at(nf->stringPosition)))
            return false;

        fragments.setSize(f, ff->size + nf->size);
        fragments.erase_single(n);
        return true;
    }
    return false;
}


int QTextDocumentPrivate::undoRedo(bool undo)
{
    PMDEBUG("%s, undoState=%d, undoStack size=%d", undo ? "undo:" : "redo:", undoState, undoStack.size());
    if (!undoEnabled || (undo && undoState == 0) || (!undo && undoState == undoStack.size()))
        return -1;

    undoEnabled = false;
    beginEditBlock();
    while (1) {
        if (undo)
            --undoState;
        QTextUndoCommand &c = undoStack[undoState];

	switch(c.command) {
        case QTextUndoCommand::Inserted:
            remove(c.pos, c.length, (QTextUndoCommand::Operation)c.operation);
            PMDEBUG("   erase: from %d, length %d", c.pos, c.length);
            c.command = QTextUndoCommand::Removed;
	    break;
        case QTextUndoCommand::Removed:
            PMDEBUG("   insert: format %d (from %d, length %d, strpos=%d)", c.format, c.pos, c.length, c.strPos);
            insert_string(c.pos, c.strPos, c.length, c.format, (QTextUndoCommand::Operation)c.operation);
            c.command = QTextUndoCommand::Inserted;
	    break;
	case QTextUndoCommand::BlockInserted:
	case QTextUndoCommand::BlockAdded:
            remove_block(c.pos, &c.blockFormat, c.command, (QTextUndoCommand::Operation)c.operation);
            PMDEBUG("   blockremove: from %d", c.pos);
	    if (c.command == QTextUndoCommand::BlockInserted)
		c.command = QTextUndoCommand::BlockRemoved;
	    else
		c.command = QTextUndoCommand::BlockDeleted;
	    break;
	case QTextUndoCommand::BlockRemoved:
	case QTextUndoCommand::BlockDeleted:
            PMDEBUG("   blockinsert: charformat %d blockformat %d (pos %d, strpos=%d)", c.format, c.blockFormat, c.pos, c.strPos);
            insert_block(c.pos, c.strPos, c.format, c.blockFormat, (QTextUndoCommand::Operation)c.operation, c.command);
	    if (c.command == QTextUndoCommand::BlockRemoved)
		c.command = QTextUndoCommand::BlockInserted;
	    else
		c.command = QTextUndoCommand::BlockAdded;
	    break;
	case QTextUndoCommand::CharFormatChanged: {
            PMDEBUG("   charFormat: format %d (from %d, length %d)", c.format, c.pos, c.length);
            FragmentIterator it = find(c.pos);
            Q_ASSERT(!it.atEnd());

            int oldFormat = it.value()->format;
            setCharFormat(c.pos, c.length, formats.charFormat(c.format));
            c.format = oldFormat;
	    break;
	}
	case QTextUndoCommand::BlockFormatChanged: {
            PMDEBUG("   blockformat: format %d pos %d", c.format, c.pos);
            QTextBlock it = blocksFind(c.pos);
            Q_ASSERT(it.isValid());

            int oldFormat = block(it)->format;
            block(it)->format = c.format;
            QTextBlockGroup *oldGroup = qobject_cast<QTextBlockGroup *>(objectForFormat(formats.blockFormat(oldFormat)));
            QTextBlockGroup *group = qobject_cast<QTextBlockGroup *>(objectForFormat(formats.blockFormat(c.format)));
            c.format = oldFormat;
            if (group != oldGroup) {
                if (oldGroup)
                    oldGroup->blockRemoved(it);
                if (group)
                    group->blockInserted(it);
            } else if (group) {
                group->blockFormatChanged(it);
            }
            documentChange(it.position(), it.length());
	    break;
	}
	case QTextUndoCommand::GroupFormatChange: {
            PMDEBUG("   group format change");
            QTextObject *object = objectForIndex(c.objectIndex);
            int oldFormat = formats.objectFormatIndex(c.objectIndex);
            changeObjectFormat(object, c.format);
            c.format = oldFormat;
	    break;
	}
	case QTextUndoCommand::Custom:
            if (undo)
                c.custom->undo();
            else
                c.custom->redo();
	    break;
	default:
	    Q_ASSERT(false);
        }
        if (undo) {
            if (undoState == 0 || !undoStack[undoState-1].block)
                break;
        } else {
            ++undoState;
            if (undoState == undoStack.size() || !undoStack[undoState-1].block)
                break;
        }
    }
    undoEnabled = true;
    int editPos = -1;
    if (docChangeFrom >= 0) {
        editPos = qMin(docChangeFrom + docChangeLength, length() - 1);
    }
    endEditBlock();
    emitUndoAvailable(isUndoAvailable());
    emitRedoAvailable(isRedoAvailable());
    return editPos;
}

/*!
    Appends a custom undo \a item to the undo stack.
*/
void QTextDocumentPrivate::appendUndoItem(QAbstractUndoItem *item)
{
    if (!undoEnabled) {
        delete item;
        return;
    }

    QTextUndoCommand c;
    c.command = QTextUndoCommand::Custom;
    c.block = editBlock != 0;
    c.operation = QTextUndoCommand::MoveCursor;
    c.format = 0;
    c.strPos = 0;
    c.pos = 0;
    c.blockFormat = 0;

    c.custom = item;
    appendUndoItem(c);
}

void QTextDocumentPrivate::appendUndoItem(const QTextUndoCommand &c)
{
    PMDEBUG("appendUndoItem, command=%d enabled=%d", c.command, undoEnabled);
    if (!undoEnabled)
        return;
    if (undoState < undoStack.size())
        truncateUndoStack();

    if (!undoStack.isEmpty() && modified) {
        QTextUndoCommand &last = undoStack[undoState - 1];
        if (last.tryMerge(c))
            return;
    }
    undoStack.append(c);
    undoState++;
    emitUndoAvailable(true);
    emitRedoAvailable(false);
}

void QTextDocumentPrivate::truncateUndoStack() {
    if (undoState == undoStack.size())
        return;

    for (int i = undoState; i < undoStack.size(); ++i) {
        QTextUndoCommand c = undoStack[i];
        if (c.command & QTextUndoCommand::Removed) {
            // ########
//             QTextFragment *f = c.fragment_list;
//             while (f) {
//                 QTextFragment *n = f->right;
//                 delete f;
//                 f = n;
//             }
        } else if (c.command & QTextUndoCommand::Custom) {
            delete c.custom;
        }
    }
    undoStack.resize(undoState);
}

void QTextDocumentPrivate::emitUndoAvailable(bool available)
{
    if (available != wasUndoAvailable) {
        Q_Q(QTextDocument);
        emit q->undoAvailable(available);
        wasUndoAvailable = available;
    }
}

void QTextDocumentPrivate::emitRedoAvailable(bool available)
{
    if (available != wasRedoAvailable) {
        Q_Q(QTextDocument);
        emit q->redoAvailable(available);
        wasRedoAvailable = available;
    }
}

void QTextDocumentPrivate::enableUndoRedo(bool enable)
{
    if (!enable) {
        undoState = 0;
        truncateUndoStack();
        emitUndoAvailable(false);
        emitRedoAvailable(false);
    }
    modifiedState = modified ? -1 : undoState;
    undoEnabled = enable;
    if (!undoEnabled)
        compressPieceTable();
}

void QTextDocumentPrivate::joinPreviousEditBlock()
{
    beginEditBlock();

    if (undoEnabled && undoState)
        undoStack[undoState - 1].block = true;
}

void QTextDocumentPrivate::endEditBlock()
{
    Q_Q(QTextDocument);
    if (--editBlock)
        return;

    if (undoEnabled && undoState > 0)
        undoStack[undoState - 1].block = false;

    if (framesDirty)
        scan_frames(docChangeFrom, docChangeOldLength, docChangeLength);

    if (lout && docChangeFrom >= 0) {
        if (!inContentsChange) {
            inContentsChange = true;
            emit q->contentsChange(docChangeFrom, docChangeOldLength, docChangeLength);
            inContentsChange = false;
        }
        lout->documentChanged(docChangeFrom, docChangeOldLength, docChangeLength);
    }

    docChangeFrom = -1;

    while (!changedCursors.isEmpty()) {
        QTextCursorPrivate *curs = changedCursors.takeFirst();
        emit q->cursorPositionChanged(QTextCursor(curs));
    }

    contentsChanged();

    if (blocks.numNodes() != lastBlockCount) {
        lastBlockCount = blocks.numNodes();
        emit q->blockCountChanged(lastBlockCount);
    }

    if (!undoEnabled && unreachableCharacterCount)
        compressPieceTable();
}

void QTextDocumentPrivate::documentChange(int from, int length)
{
//     qDebug("QTextDocumentPrivate::documentChange: from=%d,length=%d", from, length);
    if (docChangeFrom < 0) {
        docChangeFrom = from;
        docChangeOldLength = length;
        docChangeLength = length;
        return;
    }
    int start = qMin(from, docChangeFrom);
    int end = qMax(from + length, docChangeFrom + docChangeLength);
    int diff = qMax(0, end - start - docChangeLength);
    docChangeFrom = start;
    docChangeOldLength += diff;
    docChangeLength += diff;
}

void QTextDocumentPrivate::adjustDocumentChangesAndCursors(int from, int addedOrRemoved, QTextUndoCommand::Operation op)
{
    Q_Q(QTextDocument);
    for (int i = 0; i < cursors.size(); ++i) {
        QTextCursorPrivate *curs = cursors.at(i);
        if (curs->adjustPosition(from, addedOrRemoved, op) == QTextCursorPrivate::CursorMoved) {
            if (editBlock) {
                if (!changedCursors.contains(curs))
                    changedCursors.append(curs);
            } else {
                emit q->cursorPositionChanged(QTextCursor(curs));
            }
        }
    }

//     qDebug("QTextDocumentPrivate::adjustDocumentChanges: from=%d,addedOrRemoved=%d", from, addedOrRemoved);
    if (docChangeFrom < 0) {
        docChangeFrom = from;
        if (addedOrRemoved > 0) {
            docChangeOldLength = 0;
            docChangeLength = addedOrRemoved;
        } else {
            docChangeOldLength = -addedOrRemoved;
            docChangeLength = 0;
        }
//         qDebug("adjustDocumentChanges:");
//         qDebug("    -> %d %d %d", docChangeFrom, docChangeOldLength, docChangeLength);
        contentsChanged();
        return;
    }

    // have to merge the new change with the already existing one.
    int added = qMax(0, addedOrRemoved);
    int removed = qMax(0, -addedOrRemoved);

    int diff = 0;
    if(from + removed < docChangeFrom)
        diff = docChangeFrom - from - removed;
    else if(from > docChangeFrom + docChangeLength)
        diff = from - (docChangeFrom + docChangeLength);

    int overlap_start = qMax(from, docChangeFrom);
    int overlap_end = qMin(from + removed, docChangeFrom + docChangeLength);
    int removedInside = qMax(0, overlap_end - overlap_start);
    removed -= removedInside;

//     qDebug("adjustDocumentChanges: from=%d, addedOrRemoved=%d, diff=%d, removedInside=%d", from, addedOrRemoved, diff, removedInside);
    docChangeFrom = qMin(docChangeFrom, from);
    docChangeOldLength += removed + diff;
    docChangeLength += added - removedInside + diff;
//     qDebug("    -> %d %d %d", docChangeFrom, docChangeOldLength, docChangeLength);

    contentsChanged();
}