Method refresh

src/qt/peertablemodel.cpp:152–191

}

void PeerTableModel::refresh()
{
    interfaces::Node::NodesStats nodes_stats;
    m_node.getNodesStats(nodes_stats);
    decltype(m_peers_data) new_peers_data;
    new_peers_data.reserve(nodes_stats.size());
    for (const auto& node_stats : nodes_stats) {
        const CNodeCombinedStats stats{std::get<0>(node_stats), std::get<2>(node_stats), std::get<1>(node_stats)};
        new_peers_data.append(stats);
    }

    // Handle peer addition or removal as suggested in Qt Docs. See:
    // - https://doc.qt.io/qt-5/model-view-programming.html#inserting-and-removing-rows
    // - https://doc.qt.io/qt-5/model-view-programming.html#resizable-models
    // We take advantage of the fact that the std::vector returned
    // by interfaces::Node::getNodesStats is sorted by nodeid.
    for (int i = 0; i < m_peers_data.size();) {
        if (i < new_peers_data.size() && m_peers_data.at(i).nodeStats.nodeid == new_peers_data.at(i).nodeStats.nodeid) {
            ++i;
            continue;
        }
        // A peer has been removed from the table.
        beginRemoveRows(QModelIndex(), i, i);
        m_peers_data.erase(m_peers_data.begin() + i);
        endRemoveRows();
    }

    if (m_peers_data.size() < new_peers_data.size()) {
        // Some peers have been added to the end of the table.
        beginInsertRows(QModelIndex(), m_peers_data.size(), new_peers_data.size() - 1);
        m_peers_data.swap(new_peers_data);
        endInsertRows();
    } else {
        m_peers_data.swap(new_peers_data);
    }

    const auto top_left = index(0, 0);
    const auto bottom_right = index(rowCount() - 1, columnCount() - 1);
    Q_EMIT dataChanged(top_left, bottom_right);
}