Method takeUpdatedChildrenInfo

YACReaderLibrary/db/folder_model.cpp:238–328

}

void FolderModel::takeUpdatedChildrenInfo(FolderItem *parent, const QModelIndex &parentModelIndex, FolderItem *updated)
{
    auto currentChildren = parent->children();
    auto updatedChildren = updated->children();

    int lenght = currentChildren.size();
    int lenghtUpdated = updatedChildren.size();

    int m; // index that reflects modifications on the actual model for this parent
    int i; // index of the original children before update
    int j; // index of the updated children
    for (m = 0, i = 0, j = 0; (i < lenght) && (j < lenghtUpdated);) {
        auto child = currentChildren[i];
        auto updatedChild = updatedChildren[j];

        // same folder
        auto sameFolderId = child->id == updatedChild->id; // and also same name
        if (sameFolderId) {
            // 1. check if child data needs to be udpated
            if (child->getData() != updatedChild->getData()) {
                auto modelIndexToUpdate = index(m, 0, parentModelIndex);

                child->setData(updatedChild->getData());

                emit dataChanged(modelIndexToUpdate, modelIndexToUpdate);
            }

            // 2. update children info
            takeUpdatedChildrenInfo(child, index(m, 0, parentModelIndex), updatedChild);

            m++;
            i++;
            j++;
            continue;
        }

        auto childName = child->data(Name).toString();
        auto childUpdatedName = updatedChild->data(Name).toString();

        // folder added
        if (!naturalSortLessThanCI(childName, childUpdatedName)) {
            beginInsertRows(parentModelIndex, m, m);

            parent->addChild(updatedChild, m);
            updated->removeChild(updatedChild);

            endInsertRows();

            m++;
            j++;
            continue;
        }

        // folder removed
        if (naturalSortLessThanCI(childName, childUpdatedName)) {
            beginRemoveRows(parentModelIndex, m, m);

            delete parent->child(m);