Method buildTreeModel

app/src/DataModel/ProjectEditor.cpp:1319–1401

* @brief Rebuilds the project-structure tree, restoring expansion and selection. */

 * @brief Rebuilds the project-structure tree, restoring expansion and selection.
 */
void DataModel::ProjectEditor::buildTreeModel()
{
  m_rootItems.clear();
  m_groupItems.clear();
  m_sourceItems.clear();
  m_actionItems.clear();
  m_datasetItems.clear();
  m_outputWidgetItems.clear();
  m_sourceParserItems.clear();
  m_userTableItems.clear();
  m_groupFolderItems.clear();
  m_tableFolderItems.clear();
  m_workspaceItems.clear();
  m_workspaceFolderItems.clear();
  m_groupsRootItem     = nullptr;
  m_tablesRootItem     = nullptr;
  m_systemDatasetsItem = nullptr;
  m_workspacesRootItem = nullptr;
  m_mqttPublisherItem  = nullptr;
  m_controlScriptItem  = nullptr;

  const bool seeding = m_seedExpansionFromModel;
  QHash<QString, bool> expandedStates;
  if (seeding) {
    const auto& persisted = DataModel::ProjectModel::instance().treeExpansion();
    for (auto it = persisted.constBegin(); it != persisted.constEnd(); ++it)
      expandedStates.insert(it.key(), it.value().toBool());

    m_seedExpansionFromModel = false;
  } else if (m_treeModel) {
    saveExpandedStateMap(m_treeModel->invisibleRootItem(), expandedStates, "");
  }

  if (m_currentSelectionConnection) {
    QObject::disconnect(m_currentSelectionConnection);
    m_currentSelectionConnection = QMetaObject::Connection();
  }

  if (m_selectionModel) {
    m_selectionModel->deleteLater();
    m_selectionModel = nullptr;
  }

  if (m_treeModel) {
    m_treeModel->disconnect(this);
    m_treeModel->deleteLater();
    m_treeModel = nullptr;
  }

  m_treeModel = new CustomModel(this);

  const auto& pm = DataModel::ProjectModel::instance();
  auto* root     = new QStandardItem(pm.title());
  root->setData(root->text(), TreeViewText);
  root->setData("qrc:/icons/project-editor/treeview/project-setup.svg", TreeViewIcon);
  root->setData(true, TreeViewExpanded);

  m_treeModel->appendRow(root);