Method populateFromNode

plugins/quickinspector/quickscenegraphmodel.cpp:183–359

    }

void QuickSceneGraphModel::populateFromNode(QSGNode *node, bool emitSignals)
{
    if (!node)
        return;

    QVector<QSGNode *> &childList = m_parentChildMap[node];
    QVector<QSGNode *> newChildList;

    newChildList.reserve(node->childCount());
    for (QSGNode *childNode = node->firstChild(); childNode; childNode = childNode->nextSibling())
        newChildList.append(childNode);

    QModelIndex myIndex; // don't call indexForNode(node) here yet, in the common case of few changes we waste a lot of time here
    bool hasMyIndex = false;

    std::sort(newChildList.begin(), newChildList.end());

    auto i = childList.begin();
    auto j = newChildList.constBegin();

    while (i != childList.end() && j != newChildList.constEnd()) {
        if (*i < *j) { // handle deleted node
            emit nodeDeleted(*i);
            GET_INDEX
            if (emitSignals) {
                const auto idx = std::distance(childList.begin(), i);
                beginRemoveRows(myIndex, idx, idx);
            }
            pruneSubTree(*i);
            i = childList.erase(i);
            if (emitSignals)
                endRemoveRows();
        } else if (*i > *j) { // handle added node
            GET_INDEX
            const auto idx = std::distance(childList.begin(), i);
            if (contains(m_childParentMap, *j)) { // move from elsewhere in our tree
                const auto sourceIdx = indexForNode(*j);
                Q_ASSERT(sourceIdx.isValid());
#if 0
                if (emitSignals)
                    beginMoveRows(sourceIdx.parent(), sourceIdx.row(), sourceIdx.row(), myIndex,
                                  idx);
                m_parentChildMap[m_childParentMap.value(*j)].remove(sourceIdx.row());
                m_childParentMap.insert(*j, node);
                i = childList.insert(i, *j);
                if (emitSignals)
                    endMoveRows();
#else
                if (emitSignals) {
                    beginRemoveRows(sourceIdx.parent(), sourceIdx.row(), sourceIdx.row());
                }

                auto cit = m_childParentMap.find(*j);
                if (cit != m_childParentMap.end()) {
                    QSGNode *node = cit->second;
                    m_parentChildMap[node].remove(sourceIdx.row());

                    m_childParentMap.erase(cit);