Qt Entity Creator

File locations

Header structure

#ifndef ORES_QT_CLIENT_<ENTITY>_MODEL_HPP
#define ORES_QT_CLIENT_<ENTITY>_MODEL_HPP

#include <vector>
#include <QFutureWatcher>
#include <QAbstractTableModel>
#include "ores.qt/ClientManager.hpp"
#include "ores.logging/make_logger.hpp"
#include "<component>/domain/<entity>.hpp"

namespace ores::qt {

class Client<Entity>Model final : public QAbstractTableModel {
    Q_OBJECT

private:
    inline static std::string_view logger_name = "ores.qt.client_<entity>_model";

    [[nodiscard]] static auto& lg() {
        using namespace ores::logging;
        static auto instance = make_logger(logger_name);
        return instance;
    }

public:
    enum Column {
        // Define columns matching display fields
        // Example: IsoCode, Name, Symbol, ..., ColumnCount
        ColumnCount
    };

    explicit Client<Entity>Model(ClientManager* clientManager,
                                  QObject* parent = nullptr);
    ~Client<Entity>Model() override = default;

    // QAbstractTableModel interface
    int rowCount(const QModelIndex& parent = QModelIndex()) const override;
    int columnCount(const QModelIndex& parent = QModelIndex()) const override;
    QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
    QVariant headerData(int section, Qt::Orientation orientation,
                        int role = Qt::DisplayRole) const override;

    // Data access
    const <component>::domain::<entity>* get<Entity>(int row) const;
    void refresh();

    // Pagination
    std::uint32_t page_size() const { return page_size_; }
    void set_page_size(std::uint32_t size);
    std::uint32_t total_available_count() const { return total_available_count_; }
    void load_page(std::uint32_t offset, std::uint32_t limit);

signals:
    void dataLoaded();
    void loadError(const QString& error_message, const QString& details = {});

private slots:
    void onDataLoaded();

private:
    struct FetchResult {
        bool success;
        std::vector<<component>::domain::<entity>> entries;
        std::uint32_t total_available_count;
        QString error_message;
        QString error_details;
    };

    void fetch_data(std::uint32_t offset, std::uint32_t limit);

    ClientManager* clientManager_;
    std::vector<<component>::domain::<entity>> entries_;
    QFutureWatcher<FetchResult>* watcher_;

    std::uint32_t page_size_{100};
    std::uint32_t total_available_count_{0};
    bool is_fetching_{false};
};

}

#endif

Implementation patterns

• Async fetch pattern with exception handling
  

  Use process_authenticated_request for typed request/response handling. The protocol request must include offset and limit fields, and the response must include total_available_count.

  #include "ores.qt/ExceptionHelper.hpp"
  #include "ores.comms/net/client_session.hpp"
  
  void Client<Entity>Model::fetch_data(std::uint32_t offset, std::uint32_t limit) {
      is_fetching_ = true;
      QPointer<Client<Entity>Model> self = this;
  
      QFuture<FetchResult> future =
          QtConcurrent::run([self, offset, limit]() -> FetchResult {
              return exception_helper::wrap_async_fetch<FetchResult>([&]() -> FetchResult {
                  if (!self || !self->clientManager_) {
                      return {.success = false, .entries = {}, .total_available_count = 0,
                              .error_message = "Model was destroyed",
                              .error_details = {}};
                  }
  
                  // Build typed request with pagination params
                  <component>::messaging::get_<entity>s_request request;
                  request.offset = offset;
                  request.limit = limit;
  
                  auto result = self->clientManager_->
                      process_authenticated_request(std::move(request));
  
                  if (!result) {
                      return {.success = false, .entries = {}, .total_available_count = 0,
                              .error_message = QString::fromStdString(
                                  "Failed to fetch: " + comms::net::to_string(result.error())),
                              .error_details = {}};
                  }
  
                  return {.success = true,
                          .entries = std::move(result-><entity>s),
                          .total_available_count = result->total_available_count,
                          .error_message = {}, .error_details = {}};
              }, "<entity>s");  // Entity name for error messages
          });
  
      watcher_->setFuture(future);
  }
  
  void Client<Entity>Model::onDataLoaded() {
      is_fetching_ = false;
  
      const auto result = watcher_->result();
  
      if (!result.success) {
          BOOST_LOG_SEV(lg(), error) << "Failed to fetch <entity>s: "
                                     << result.error_message.toStdString();
          emit loadError(result.error_message, result.error_details);
          return;
      }
  
      beginResetModel();
      entries_ = std::move(result.entries);
      total_available_count_ = result.total_available_count;
      endResetModel();
  
      emit dataLoaded();
  }
  

  The wrap_async_fetch template catches any std::exception thrown inside the lambda and populates the error_message and error_details fields with full boost::diagnostic_information. This preserves exception details that would otherwise be lost when Qt wraps exceptions in QUnhandledException.

• Optional: Recency highlighting for modified records
  

  If you want to highlight recently-modified records in the table view with a pulsing color effect, use the RecencyTracker and RecencyPulseManager utility classes:

  1. Add to header:

  #include "ores.qt/RecencyPulseManager.hpp"
  #include "ores.qt/RecencyTracker.hpp"
  
  private slots:
      void onPulseStateChanged(bool isOn);
      void onPulsingComplete();
  
  private:
      QVariant foregroundColor(const std::string& identifier) const;
  
      // Recency highlighting - define key extractor type and tracker
      using KeyExtractor = std::string(*)(const <component>::domain::<entity>&);
      RecencyTracker<<component>::domain::<entity>, KeyExtractor> recencyTracker_;
      RecencyPulseManager* pulseManager_;
  

  1. Define a key extractor function and initialize in constructor:

  namespace {
      std::string entity_key_extractor(const <component>::domain::<entity>& e) {
          return e.<primary_key_field>;  // e.g., e.name, e.iso_code
      }
  }
  
  Client<Entity>Model::Client<Entity>Model(...)
      : QAbstractTableModel(parent),
        // ...other members...
        recencyTracker_(entity_key_extractor),
        pulseManager_(new RecencyPulseManager(this)) {
  
      connect(pulseManager_, &RecencyPulseManager::pulse_state_changed,
              this, &Client<Entity>Model::onPulseStateChanged);
      connect(pulseManager_, &RecencyPulseManager::pulsing_complete,
              this, &Client<Entity>Model::onPulsingComplete);
  }
  

  1. In data() method, handle Qt::ForegroundRole:

  if (role == Qt::ForegroundRole) {
      return foregroundColor(entry.<primary_key_field>);
  }
  

  1. Implement the helper methods:

  QVariant Client<Entity>Model::foregroundColor(const std::string& id) const {
      if (recencyTracker_.is_recent(id) && pulseManager_->is_pulse_on()) {
          return color_constants::stale_indicator;
      }
      return {};
  }
  
  void Client<Entity>Model::onPulseStateChanged(bool /*isOn*/) {
      if (!entries_.empty()) {
          emit dataChanged(index(0, 0), index(rowCount() - 1, columnCount() - 1),
              {Qt::ForegroundRole});
      }
  }
  
  void Client<Entity>Model::onPulsingComplete() {
      recencyTracker_.clear();
  }
  

  1. After loading data, update recency tracking and start pulsing if needed:

  recencyTracker_.clear();
  pulseManager_->stop_pulsing();
  // ... load data into entries_ ...
  
  const bool has_recent = recencyTracker_.update(entries_);
  if (has_recent && !pulseManager_->is_pulsing()) {
      pulseManager_->start_pulsing();
  }
  

  The RecencyTracker handles all timestamp comparison logic automatically, comparing each entity's recorded_at field against the last reload time

Commit message

[qt] Add Client<Entity>Model for <entity> data fetching

Create Qt model for fetching and displaying <entity> data from the
server with async loading and pagination support.

Icon selection

File locations

Header structure

#ifndef ORES_QT_<ENTITY>_MDI_WINDOW_HPP
#define ORES_QT_<ENTITY>_MDI_WINDOW_HPP

#include <QTableView>
#include <QVBoxLayout>
#include <QToolBar>
#include <QSortFilterProxyModel>
#include <memory>
#include "ores.qt/EntityListMdiWindow.hpp"
#include "ores.qt/ClientManager.hpp"
#include "ores.qt/Client<Entity>Model.hpp"
#include "ores.qt/PaginationWidget.hpp"  // If pagination needed
#include "ores.logging/make_logger.hpp"
#include "<component>/domain/<entity>.hpp"

namespace ores::qt {

class <Entity>MdiWindow final : public EntityListMdiWindow {
    Q_OBJECT

private:
    inline static std::string_view logger_name = "ores.qt.<entity>_mdi_window";

    [[nodiscard]] static auto& lg() {
        using namespace ores::logging;
        static auto instance = make_logger(logger_name);
        return instance;
    }

public:
    explicit <Entity>MdiWindow(ClientManager* clientManager,
                                const QString& username,
                                QWidget* parent = nullptr);
    ~<Entity>MdiWindow() override = default;

    Client<Entity>Model* model() const { return model_.get(); }

public slots:
    void reload() override;  // Pure virtual from EntityListMdiWindow

signals:
    void statusChanged(const QString& message);
    void errorOccurred(const QString& error_message);
    void selectionChanged(int selection_count);
    void addNewRequested();
    void show<Entity>Details(const <component>::domain::<entity>& entity);
    void <entity>Deleted(const QString& id);
    void show<Entity>History(const QString& id);

protected:
    QString normalRefreshTooltip() const override {
        return tr("Refresh <entity>s");
    }

private slots:
    void onDataLoaded();
    void onLoadError(const QString& error_message, const QString& details = {});
    void onSelectionChanged();
    void onRowDoubleClicked(const QModelIndex& index);
    void onConnectionStateChanged();
    void addNew();
    void editSelected();
    void deleteSelected();
    void showHistory();

private:
    void setupUi();
    void setupToolbar();
    void updateActionStates();

    // Layout
    QVBoxLayout* verticalLayout_;
    QTableView* tableView_;
    QToolBar* toolBar_;
    PaginationWidget* paginationWidget_;  // If pagination needed

    // Standard actions
    QAction* addAction_;
    QAction* editAction_;
    QAction* deleteAction_;
    QAction* refreshAction_;
    QAction* historyAction_;

    // Model
    std::unique_ptr<Client<Entity>Model> model_;
    QSortFilterProxyModel* proxyModel_;
    ClientManager* clientManager_;
    QString username_;
};

}

#endif

Implementation patterns

• Constructor setup sequence
  
  1. Initialize member variables.
  2. Create toolbar with setupToolbar().
  3. Setup reload action with stale indicator.
  4. Add standard actions (Add, Edit, Delete, History).
  5. Create table view with standard configuration.
  6. Setup proxy model for sorting/filtering.
  7. Connect model signals.
  8. Connect pagination signals (if applicable).
  9. Connect connection state signals.
  10. Update action states.
  11. Load initial data if connected.
• Standard table configuration and settings
  

  After creating the table view and model, call initializeTableSettings() from the base class. This single call handles:

  • Setting ResizeToContents on all columns
  • Column visibility context menu (right-click header to show/hide columns)
  • Saving/restoring header state (column order, visibility, width) via QSettings
  • Saving/restoring window size via QSettings
  • Settings version management (bump to discard stale saved state)
  • Default hidden columns (applied when no saved state or version mismatch)
  • sizeHint() returns saved window size or the default size you specify

  tableView_->setAlternatingRowColors(true);
  tableView_->setSelectionBehavior(QAbstractItemView::SelectRows);
  tableView_->setSelectionMode(QAbstractItemView::ExtendedSelection);
  tableView_->setWordWrap(false);
  tableView_->setSortingEnabled(true);
  tableView_->verticalHeader()->setVisible(false);
  
  // This replaces ALL manual column setup, save/restore, and column visibility code.
  // Parameters: tableView, sourceModel, settingsGroup, defaultHiddenColumns, defaultSize, settingsVersion
  initializeTableSettings(tableView_, model_.get(),
      "<Entity>ListWindow",
      {Client<Entity>Model::Description},  // Columns hidden by default (or {} for none)
      {900, 400},  // Default window size
      1);          // Bump when column layout changes
  

  Important: Do NOT use setColumnWidth(), setStretchLastSection(true), or setSectionResizeMode(QHeaderView::Fixed). All list windows must use ResizeToContents consistently (set by initializeTableSettings()) so columns auto-size to actual data and behave identically across all entity windows.

  Do NOT implement the following in subclasses — they are handled by the base class:

  • sizeHint() — returns saved window size or default from initializeTableSettings()
  • saveSettings() — saves header state and window size on close
  • setupColumnVisibility() / showHeaderContextMenu() — column visibility context menu
  • Any manual QSettings save/restore code
• Settings versioning for column layout
  

  When column layout changes (columns added, removed, renamed, or reordered), bump the settingsVersion parameter in initializeTableSettings() to invalidate cached header state. This forces users to get the new defaults on next launch.

• Non-Latin text detection for transliterated names
  

  When an entity has both a full_name (possibly in non-Latin script) and a transliterated_name, merge them into the Name column display rather than showing a separate Transliterated Name column. Use TextUtils from ores.qt/TextUtils.hpp:

  #include "ores.qt/TextUtils.hpp"
  // ...
  case FullName:
      return TextUtils::display_name_with_transliteration(
          entity.full_name, entity.transliterated_name);
  

  This detects non-Latin characters (Korean, Chinese, Japanese, Arabic, Cyrillic, etc.) and appends the transliteration in parentheses, truncated to 30 characters with an ellipsis. The Transliterated Name column should be hidden by default (enforced in restoreSettings() regardless of saved state).

• Stale indicator pattern (using EntityListMdiWindow base class)
  

  The base class EntityListMdiWindow provides all stale indicator functionality. In your setupToolbar(), create the refresh action and call initializeStaleIndicator():

  void <Entity>MdiWindow::setupToolbar() {
      toolBar_ = new QToolBar(this);
      const QColor iconColor = color_constants::icon_color;
  
      // Create refresh action
      refreshAction_ = new QAction(
          IconUtils::createRecoloredIcon(
              ":/icons/ic_fluent_arrow_sync_20_regular.svg", iconColor),
          tr("Refresh"), this);
      connect(refreshAction_, &QAction::triggered, this, &<Entity>MdiWindow::reload);
      toolBar_->addAction(refreshAction_);
  
      // Initialize stale indicator (base class handles pulse animation)
      initializeStaleIndicator(refreshAction_,
          ":/icons/ic_fluent_arrow_sync_20_regular.svg");
  
      // Add other actions...
      addAction_ = new QAction(/* ... */);
      // etc.
  }
  
  void <Entity>MdiWindow::reload() {
      clearStaleIndicator();  // Clear stale state before reloading
      model_->refresh();
  }
  

  The base class provides:

  • markAsStale() - Starts pulse animation and shows stale tooltip
  • clearStaleIndicator() - Stops animation and restores normal state
  • normalRefreshTooltip() / staleRefreshTooltip() - Override for custom tooltips
• Pagination widget pattern
  

  For entities with large datasets, add a PaginationWidget below the table view and connect its signals to the model:

  // In setupUi():
  pagination_widget_ = new PaginationWidget(this);
  layout->addWidget(pagination_widget_);
  
  // In setupConnections():
  connect(pagination_widget_, &PaginationWidget::page_size_changed,
          this, [this](std::uint32_t size) {
      model_->set_page_size(size);
      model_->refresh();
  });
  
  connect(pagination_widget_, &PaginationWidget::load_all_requested,
          this, [this]() {
      const auto total = model_->total_available_count();
      if (total > 0 && total <= 1000) {
          model_->set_page_size(total);
          model_->refresh();
      }
  });
  
  connect(pagination_widget_, &PaginationWidget::page_requested,
          this, [this](std::uint32_t offset, std::uint32_t limit) {
      model_->load_page(offset, limit);
  });
  
  // In onDataLoaded():
  const auto loaded = model_->rowCount();
  const auto total = model_->total_available_count();
  pagination_widget_->update_state(loaded, total);
  pagination_widget_->set_load_all_enabled(
      loaded < static_cast<int>(total) && total > 0 && total <= 1000);
  

  Reference: CurrencyMdiWindow and PartyMdiWindow both implement this pattern.

• Deletion pattern
  

  void <Entity>MdiWindow::deleteSelected() {
      auto selection = tableView_->selectionModel()->selectedRows();
      if (selection.isEmpty()) return;
  
      // Collect identifiers
      QStringList ids;
      for (const auto& proxyIndex : selection) {
          auto sourceIndex = proxyModel_->mapToSource(proxyIndex);
          if (auto* entity = model_->get<Entity>(sourceIndex.row())) {
              ids << QString::fromStdString(entity->identifier());
          }
      }
  
      // Confirm deletion
      auto result = MessageBoxHelper::question(this, tr("Confirm Deletion"),
          tr("Delete %1 selected item(s)?").arg(ids.size()));
      if (result != QMessageBox::Yes) return;
  
      // Async delete operation...
  }
  

Commit message

[qt] Add <Entity>MdiWindow for <entity> list view

Create MDI window with table view, toolbar actions (add, edit, delete,
history), stale indicator, and pagination support.

File locations

Header structure

#ifndef ORES_QT_<ENTITY>_DETAIL_DIALOG_HPP
#define ORES_QT_<ENTITY>_DETAIL_DIALOG_HPP

#include <QToolBar>
#include <memory>
#include "ores.qt/DetailDialogBase.hpp"
#include "ores.qt/ClientManager.hpp"
#include "ores.logging/make_logger.hpp"
#include "<component>/domain/<entity>.hpp"

namespace Ui { class <Entity>DetailDialog; }

namespace ores::qt {

/**
 * @brief Detail dialog for viewing and editing <entity> records.
 *
 * Inherits from DetailDialogBase which provides:
 * - statusMessage/errorMessage signals
 * - requestClose() for decoupled window closing
 * - notifySaveSuccess() helper for consistent post-save behavior
 */
class <Entity>DetailDialog : public DetailDialogBase {
    Q_OBJECT

private:
    inline static std::string_view logger_name = "ores.qt.<entity>_detail_dialog";

    [[nodiscard]] static auto& lg() {
        using namespace ores::logging;
        static auto instance = make_logger(logger_name);
        return instance;
    }

public:
    explicit <Entity>DetailDialog(QWidget* parent = nullptr);
    ~<Entity>DetailDialog() override;

    void setClientManager(ClientManager* clientManager);
    void setChangeReasonCache(ChangeReasonCache* cache);
    void setUsername(const std::string& username);
    void set<Entity>(const <component>::domain::<entity>& entity);
    <component>::domain::<entity> get<Entity>() const;
    void clearDialog();

    void setReadOnly(bool readOnly, int versionNumber = 0);
    void setCreateMode(bool createMode);
    [[nodiscard]] QString identifier() const;

    // Version navigation (if history support)
    void setHistory(const std::vector<<component>::domain::<entity>>& history);
    void showVersionNavActions(bool visible);

signals:
    // Note: statusMessage and errorMessage are inherited from DetailDialogBase
    void isDirtyChanged(bool isDirty);
    void <entity>Saved(const QString& id);  // Emitted for both create and update
    void <entity>Deleted(const QString& id);
    void revertRequested(const <component>::domain::<entity>& entity);

public slots:
    void save();
    void markAsStale();

private slots:
    void onSaveClicked();
    void onDeleteClicked();
    void onRevertClicked();
    void onFieldChanged();
    void onFirstVersionClicked();
    void onPrevVersionClicked();
    void onNextVersionClicked();
    void onLastVersionClicked();

private:
    void setupToolbar();
    void setFieldsReadOnly(bool readOnly);
    void updateSaveResetButtonState();
    void displayCurrentVersion();
    void updateVersionNavButtonStates();

    std::unique_ptr<Ui::<Entity>DetailDialog> ui_;
    QToolBar* toolBar_;

    // Toolbar actions
    QAction* saveAction_;
    QAction* deleteAction_;
    QAction* revertAction_;
    QAction* firstVersionAction_;
    QAction* prevVersionAction_;
    QAction* nextVersionAction_;
    QAction* lastVersionAction_;

    // State
    bool isDirty_{false};
    bool isAddMode_{false};
    bool isReadOnly_{false};
    bool isStale_{false};

    // Data
    ClientManager* clientManager_{nullptr};
    ChangeReasonCache* changeReasonCache_{nullptr};
    std::string username_;
    <component>::domain::<entity> current<Entity>_;
    std::vector<<component>::domain::<entity>> history_;
    int currentHistoryIndex_{0};
};

}

#endif

UI file structure

<customwidgets>
  <customwidget>
    <class>ores::qt::ProvenanceWidget</class>
    <extends>QWidget</extends>
    <header>ores.qt/ProvenanceWidget.hpp</header>
    <container>0</container>
  </customwidget>
</customwidgets>

Header structure additions for tabbed dialogs

protected:
    QTabWidget* tabWidget() const override;
    QWidget* provenanceTab() const override;
    ProvenanceWidget* provenanceWidget() const override;

QTabWidget* <Entity>DetailDialog::tabWidget() const {
    return ui_->tabWidget;
}

QWidget* <Entity>DetailDialog::provenanceTab() const {
    return ui_->provenanceTab;
}

ProvenanceWidget* <Entity>DetailDialog::provenanceWidget() const {
    return ui_->provenanceWidget;
}

Implementation patterns

• Mode handling
  

  Use setProvenanceEnabled (provided by DetailDialogBase) to enable or disable the Provenance tab. The tab stays visible in all modes so the tab strip remains uniform; it is merely disabled (greyed out) in create mode.

  Use populateProvenance to populate all six fields in a single call, and clearProvenance to reset them.

  void <Entity>DetailDialog::setCreateMode(bool createMode) {
      isAddMode_ = createMode;
  
      // Primary key editable only in create mode
      ui_->identifierEdit->setReadOnly(!createMode);
  
      // Provenance tab disabled in create mode (no data yet)
      setProvenanceEnabled(!createMode);
  
      // Delete disabled in create mode
      deleteAction_->setEnabled(!createMode);
  
      updateSaveResetButtonState();
  }
  
  void <Entity>DetailDialog::set<Entity>(const <component>::domain::<entity>& entity) {
      current<Entity>_ = entity;
      updateUiFrom<Entity>();
  }
  
  void <Entity>DetailDialog::updateUiFrom<Entity>() {
      // Populate entity-specific fields...
      ui_->nameEdit->setText(QString::fromStdString(current<Entity>_.name));
      // ...
  
      // Populate all six provenance fields via base class helper
      populateProvenance(current<Entity>_.version,
                         current<Entity>_.modified_by,
                         current<Entity>_.performed_by,
                         current<Entity>_.recorded_at,
                         current<Entity>_.change_reason_code,
                         current<Entity>_.change_commentary);
  }
  
  void <Entity>DetailDialog::setReadOnly(bool readOnly, int versionNumber) {
      isReadOnly_ = readOnly;
      setFieldsReadOnly(readOnly);
  
      saveAction_->setVisible(!readOnly);
      deleteAction_->setVisible(!readOnly);
      revertAction_->setVisible(readOnly);
  
      if (readOnly && versionNumber > 0) {
          // Show version info in title or status
      }
  }
  

• Tab enable/disable rules
  

  Tab	Create mode	Edit mode	Read-only mode
  General	enabled	enabled	enabled (fields read-only)
  Entity-specific tabs	enabled	enabled	enabled (fields read-only)
  Provenance	disabled	enabled	enabled

• Field change tracking
  

  void <Entity>DetailDialog::onFieldChanged() {
      if (isReadOnly_) return;
  
      isDirty_ = true;
      emit isDirtyChanged(true);
      updateSaveResetButtonState();
  }
  

• Async save pattern
  

  #include "ores.qt/ExceptionHelper.hpp"
  
  // Define a result struct for the async operation
  struct SaveResult {
      bool success;
      QString error_message;
      QString error_details;
  };
  
  void <Entity>DetailDialog::onSaveClicked() {
      if (!clientManager_ || !clientManager_->isConnected()) {
          emit errorMessage(tr("Not connected to server"));
          return;
      }
  
      // Change reason dialog (amend mode only — not required for create)
      std::string change_reason_code;
      std::string change_commentary;
      if (!isAddMode_) {
          if (!changeReasonCache_ || !changeReasonCache_->isLoaded()) {
              emit errorMessage(tr("Change reasons not loaded. Please try again."));
              return;
          }
          auto reasons = changeReasonCache_->getReasonsForAmend(
              std::string{reason::categories::common});
          if (reasons.empty()) {
              emit errorMessage(tr("No change reasons available. Please contact administrator."));
              return;
          }
          ChangeReasonDialog dlg(reasons, ChangeReasonDialog::OperationType::Amend,
                                 isDirty_, this);
          if (dlg.exec() != QDialog::Accepted)
              return;
          change_reason_code = dlg.selectedReasonCode();
          change_commentary  = dlg.commentary();
      }
  
      auto entity = get<Entity>();
  
      QPointer<<Entity>DetailDialog> self = this;
      QFuture<SaveResult> future = QtConcurrent::run(
              [self, entity, change_reason_code, change_commentary]() -> SaveResult {
          return exception_helper::wrap_async_fetch<SaveResult>([&]() -> SaveResult {
              if (!self) {
                  return {.success = false,
                          .error_message = "Dialog closed",
                          .error_details = {}};
              }
  
              // Build and send request...
              auto response = /* deserialize response */;
              if (!response->success) {
                  return {.success = false,
                          .error_message = QString::fromStdString(response->message),
                          .error_details = {}};
              }
  
              return {.success = true, .error_message = {}, .error_details = {}};
          }, "<entity>");
      });
  
      auto* watcher = new QFutureWatcher<SaveResult>(self);
      connect(watcher, &QFutureWatcher<SaveResult>::finished, self, [self, watcher]() {
          const auto result = watcher->result();
          watcher->deleteLater();
  
          if (result.success) {
              // Emit entity-specific signal first
              emit self-><entity>Saved(self->identifier());
  
              // Then use base class helper to emit status and close dialog
              self->notifySaveSuccess(
                  tr("<Entity> '%1' saved").arg(self->identifier()));
          } else {
              BOOST_LOG_SEV(lg(), error) << "Save failed: "
                                         << result.error_message.toStdString();
              emit self->errorMessage(result.error_message);
              MessageBoxHelper::critical(self, tr("Save Error"),
                  result.error_message, result.error_details);
          }
      });
  
      watcher->setFuture(future);
  }
  

• Async delete pattern with change reason
  

  struct DeleteResult {
      bool success;
      std::string message;
  };
  
  void <Entity>DetailDialog::onDeleteClicked() {
      if (!clientManager_ || !clientManager_->isConnected()) {
          MessageBoxHelper::warning(this, "Disconnected",
              "Cannot delete <entity> while disconnected from server.");
          return;
      }
  
      // Confirmation dialog
      auto reply = MessageBoxHelper::question(this, "Delete <Entity>",
          QString("Are you sure you want to delete '%1'?").arg(identifier()),
          QMessageBox::Yes | QMessageBox::No);
      if (reply != QMessageBox::Yes)
          return;
  
      // Change reason dialog for delete
      std::string change_reason_code;
      std::string change_commentary;
      if (!changeReasonCache_ || !changeReasonCache_->isLoaded()) {
          emit errorMessage(tr("Change reasons not loaded. Please try again."));
          return;
      }
      auto reasons = changeReasonCache_->getReasonsForDelete(
          std::string{reason::categories::common});
      if (reasons.empty()) {
          emit errorMessage(tr("No change reasons available. Please contact administrator."));
          return;
      }
      ChangeReasonDialog dlg(reasons, ChangeReasonDialog::OperationType::Delete,
                             false, this);
      if (dlg.exec() != QDialog::Accepted)
          return;
      change_reason_code = dlg.selectedReasonCode();
      change_commentary  = dlg.commentary();
  
      QPointer<<Entity>DetailDialog> self = this;
      auto task = [self, id = current<Entity>_.id,
                   change_reason_code, change_commentary]() -> DeleteResult {
          if (!self || !self->clientManager_)
              return {.success = false, .message = "Dialog closed"};
  
          // Build and send delete request...
          return {.success = response->success, .message = response->message};
      };
  
      auto* watcher = new QFutureWatcher<DeleteResult>(self);
      connect(watcher, &QFutureWatcher<DeleteResult>::finished, self, [self, watcher]() {
          auto result = watcher->result();
          watcher->deleteLater();
  
          if (result.success) {
              emit self-><entity>Deleted(self->identifier());
              self->requestClose();
          } else {
              QString errorMsg = QString::fromStdString(result.message);
              emit self->errorMessage(errorMsg);
              MessageBoxHelper::critical(self, "Delete Failed", errorMsg);
          }
      });
  
      QFuture<DeleteResult> future = QtConcurrent::run(task);
      watcher->setFuture(future);
  }
  

• Required includes for change reason support
  

  #include "ores.qt/ChangeReasonCache.hpp"
  #include "ores.qt/ChangeReasonDialog.hpp"
  #include "ores.dq/domain/change_reason_constants.hpp"
  
  namespace ores::qt {
  
  namespace reason = dq::domain::change_reason_constants;
  

Commit message

[qt] Add <Entity>DetailDialog for <entity> editing

Create detail dialog with create/edit/view-only modes, version
navigation, and async save/delete operations with change reason tracking.

Update MDI Window

void <Entity>MdiWindow::onRowDoubleClicked(const QModelIndex& index) {
    auto sourceIndex = proxyModel_->mapToSource(index);
    if (auto* entity = model_->get<Entity>(sourceIndex.row())) {
        emit show<Entity>Details(*entity);
    }
}

Commit message

[qt] Wire <Entity>DetailDialog to list window

Connect double-click and edit action to emit show details signal.

File locations

Header structure

#ifndef ORES_QT_<ENTITY>_HISTORY_DIALOG_HPP
#define ORES_QT_<ENTITY>_HISTORY_DIALOG_HPP

#include <QWidget>
#include <QToolBar>
#include <memory>
#include "ores.qt/ClientManager.hpp"
#include "ores.logging/make_logger.hpp"
#include "<component>/domain/<entity>.hpp"

namespace Ui { class <Entity>HistoryDialog; }

namespace ores::qt {

class <Entity>HistoryDialog : public QWidget {
    Q_OBJECT

private:
    inline static std::string_view logger_name = "ores.qt.<entity>_history_dialog";

    [[nodiscard]] static auto& lg() {
        using namespace ores::logging;
        static auto instance = make_logger(logger_name);
        return instance;
    }

public:
    explicit <Entity>HistoryDialog(const QString& identifier,
                                    ClientManager* clientManager,
                                    QWidget* parent = nullptr);
    ~<Entity>HistoryDialog() override;

    void loadHistory();
    void markAsStale();
    QSize sizeHint() const override;

    [[nodiscard]] const QString& identifier() const { return identifier_; }

signals:
    void statusChanged(const QString& message);
    void errorOccurred(const QString& error_message);
    void openVersionRequested(const <component>::domain::<entity>& entity, int versionNumber);
    void revertVersionRequested(const <component>::domain::<entity>& entity);

private slots:
    void onVersionSelected(int row);
    void onHistoryLoaded();
    void onHistoryLoadError(const QString& error);
    void onOpenClicked();
    void onRevertClicked();
    void onReloadClicked();

private:
    using DiffResult = QVector<QPair<QString, QPair<QString, QString>>>;

    void setupToolbar();
    void displayChangesTab(int versionIndex);
    void displayFullDetailsTab(int versionIndex);
    DiffResult calculateDiff(const <component>::domain::<entity>& current,
                             const <component>::domain::<entity>& previous);
    void updateButtonStates();
    int selectedVersionIndex() const;
    const QIcon& getHistoryIcon() const;

    std::unique_ptr<Ui::<Entity>HistoryDialog> ui_;
    QToolBar* toolBar_;

    QAction* reloadAction_;
    QAction* openAction_;
    QAction* revertAction_;

    ClientManager* clientManager_;
    QString identifier_;
    std::vector<<component>::domain::<entity>> history_;
};

}

#endif

UI file structure

Implementation patterns

• Diff calculation
  

  <Entity>HistoryDialog::DiffResult
  <Entity>HistoryDialog::calculateDiff(
      const <component>::domain::<entity>& current,
      const <component>::domain::<entity>& previous) {
  
      DiffResult result;
  
  #define CHECK_DIFF_STRING(FIELD_NAME, FIELD) \
      if (current.FIELD != previous.FIELD) { \
          result.append({FIELD_NAME, \
              {QString::fromStdString(previous.FIELD), \
               QString::fromStdString(current.FIELD)}}); \
      }
  
  #define CHECK_DIFF_BOOL(FIELD_NAME, FIELD) \
      if (current.FIELD != previous.FIELD) { \
          result.append({FIELD_NAME, \
              {previous.FIELD ? "Yes" : "No", \
               current.FIELD ? "Yes" : "No"}}); \
      }
  
      // Apply macros for each field
      CHECK_DIFF_STRING("Name", name);
      CHECK_DIFF_BOOL("Active", is_active);
      // ... etc
  
  #undef CHECK_DIFF_STRING
  #undef CHECK_DIFF_BOOL
  
      return result;
  }
  

• Async history loading
  

  #include "ores.qt/ExceptionHelper.hpp"
  
  // Define a result struct for consistency with other async patterns
  struct HistoryResult {
      bool success;
      std::vector<<component>::domain::<entity>> entries;
      QString error_message;
      QString error_details;
  };
  
  void <Entity>HistoryDialog::loadHistory() {
      QPointer<<Entity>HistoryDialog> self = this;
  
      QFuture<HistoryResult> future = QtConcurrent::run([self]() -> HistoryResult {
          return exception_helper::wrap_async_fetch<HistoryResult>([&]() -> HistoryResult {
              if (!self || !self->clientManager_) {
                  return {.success = false, .entries = {},
                          .error_message = "Dialog closed or no client",
                          .error_details = {}};
              }
  
              // Build and send history request...
              return {.success = true, .entries = std::move(history_entries),
                      .error_message = {}, .error_details = {}};
          }, "<entity> history");
      });
  
      auto* watcher = new QFutureWatcher<HistoryResult>(self);
      connect(watcher, &QFutureWatcher<HistoryResult>::finished, self, [self, watcher]() {
          const auto result = watcher->result();
          watcher->deleteLater();
  
          if (result.success) {
              self->history_ = std::move(result.entries);
              self->onHistoryLoaded();
          } else {
              BOOST_LOG_SEV(lg(), error) << "History load failed: "
                                         << result.error_message.toStdString();
              MessageBoxHelper::critical(self, tr("Load Error"),
                  result.error_message, result.error_details);
          }
      });
  
      watcher->setFuture(future);
  }
  

Commit message

[qt] Add <Entity>HistoryDialog for <entity> version history

Create history dialog with version list, changes diff view, full
details tab, and revert functionality.

Update MDI Window

void <Entity>MdiWindow::showHistory() {
    auto selection = tableView_->selectionModel()->selectedRows();
    if (selection.size() != 1) return;

    auto sourceIndex = proxyModel_->mapToSource(selection.first());
    if (auto* entity = model_->get<Entity>(sourceIndex.row())) {
        emit show<Entity>History(QString::fromStdString(entity->identifier()));
    }
}

Commit message

[qt] Wire <Entity>HistoryDialog to list window

Connect history action to emit show history signal.

File locations

Header structure

#ifndef ORES_QT_<ENTITY>_CONTROLLER_HPP
#define ORES_QT_<ENTITY>_CONTROLLER_HPP

#include <QPointer>
#include "ores.qt/EntityController.hpp"
#include "ores.qt/DetachableMdiSubWindow.hpp"
#include "ores.logging/make_logger.hpp"
#include "<component>/domain/<entity>.hpp"

namespace ores::qt {

class <Entity>MdiWindow;

class <Entity>Controller : public EntityController {
    Q_OBJECT

private:
    inline static std::string_view logger_name = "ores.qt.<entity>_controller";

    [[nodiscard]] static auto& lg() {
        using namespace ores::logging;
        static auto instance = make_logger(logger_name);
        return instance;
    }

public:
    <Entity>Controller(
        QMainWindow* mainWindow,
        QMdiArea* mdiArea,
        ClientManager* clientManager,
        const QString& username,
        ChangeReasonCache* changeReasonCache,
        QObject* parent = nullptr);

    void showListWindow() override;
    void closeAllWindows() override;
    void reloadListWindow() override;

protected:
    // Return list window for base class notification handling
    EntityListMdiWindow* listWindow() const override;

private slots:
    void onAddNewRequested();
    void onShow<Entity>Details(const <component>::domain::<entity>& entity);
    void onShow<Entity>History(const QString& id);
    void on<Entity>Deleted(const QString& id);
    void onOpenHistoryVersion(const <component>::domain::<entity>& entity, int versionNumber);
    void onRevert<Entity>(const <component>::domain::<entity>& entity);

private:
    void showDetailWindow(const <component>::domain::<entity>* entity,
                          bool createMode, bool readOnly = false,
                          int versionNumber = 0);

    ChangeReasonCache* changeReasonCache_;
    QPointer<<Entity>MdiWindow> listWindow_;
    QPointer<DetachableMdiSubWindow> listMdiSubWindow_;
};

}

#endif

class ChangeReasonCache;

Implementation patterns

• Constructor - event subscription via base class
  

  Important: The event subscription requires the eventing infrastructure to be in place:

  1. Database notification trigger exists (see sql-schema-creator skill)
  2. Event type is defined with event_traits specialization
  3. Event is registered in comms service application.cpp

  For details, see the "Eventing Infrastructure" section in the binary-protocol-developer skill.

  The EntityController base class handles all event subscription/unsubscription when you pass the event name to the constructor:

  #include "ores.eventing/domain/event_traits.hpp"
  #include "<component>/eventing/<entity>_changed_event.hpp"
  
  namespace ores::qt {
  
  using namespace ores::logging;
  
  namespace {
      // Get the event name from the event traits
      constexpr std::string_view <entity>_event_name =
          eventing::domain::event_traits<
              <component>::eventing::<entity>_changed_event>::name;
  }
  
  <Entity>Controller::<Entity>Controller(
      QMainWindow* mainWindow,
      QMdiArea* mdiArea,
      ClientManager* clientManager,
      const QString& username,
      ChangeReasonCache* changeReasonCache,
      QObject* parent)
      : EntityController(mainWindow, mdiArea, clientManager, username,
                         <entity>_event_name, parent),  // Pass event name to base
        changeReasonCache_(changeReasonCache),
        listWindow_(nullptr),
        listMdiSubWindow_(nullptr) {
  
      BOOST_LOG_SEV(lg(), debug) << "<Entity>Controller created";
  }
  
  // Override listWindow() so base class can call markAsStale()
  EntityListMdiWindow* <Entity>Controller::listWindow() const {
      return listWindow_;
  }
  

  The base class:

  • Subscribes to events on connect/reconnect
  • Unsubscribes in destructor
  • Handles onNotificationReceived and calls listWindow()->markAsStale()

  For controllers that don't need events, pass empty string_view {}:

  : EntityController(mainWindow, mdiArea, clientManager, username, {}, parent)
  

• Show list window
  

  void <Entity>Controller::showListWindow() {
      // Reuse existing window if available
      if (listMdiSubWindow_) {
          bring_window_to_front(listMdiSubWindow_);
          return;
      }
  
      BOOST_LOG_SEV(lg(), info) << "Creating new <entity> MDI window";
      const QColor iconColor = color_constants::icon_color;
  
      // Create widget
      listWindow_ = new <Entity>MdiWindow(clientManager_, username_, nullptr);
  
      // Connect signals
      connect(listWindow_, &<Entity>MdiWindow::statusChanged,
              this, &<Entity>Controller::statusMessage);
      connect(listWindow_, &<Entity>MdiWindow::errorOccurred,
              this, &<Entity>Controller::errorMessage);
      connect(listWindow_, &<Entity>MdiWindow::addNewRequested,
              this, &<Entity>Controller::onAddNewRequested);
      connect(listWindow_, &<Entity>MdiWindow::show<Entity>Details,
              this, &<Entity>Controller::onShow<Entity>Details);
      connect(listWindow_, &<Entity>MdiWindow::show<Entity>History,
              this, &<Entity>Controller::onShow<Entity>History);
  
      // Wrap in MDI sub-window
      listMdiSubWindow_ = new DetachableMdiSubWindow(mainWindow_);
      listMdiSubWindow_->setAttribute(Qt::WA_DeleteOnClose);
      listMdiSubWindow_->setWidget(listWindow_);
      listMdiSubWindow_->setWindowTitle(tr("<Entity>s"));
      listMdiSubWindow_->setWindowIcon(IconUtils::createRecoloredIcon(
          ":/icons/ic_fluent_<icon>_20_regular.svg", iconColor));
  
      register_detachable_window(listMdiSubWindow_);
  
      // Track destruction - use QPointer for safety
      connect(listMdiSubWindow_, &QObject::destroyed, this,
              [self = QPointer<<Entity>Controller>(this)]() {
          if (!self) return;
          self->listWindow_ = nullptr;
          self->listMdiSubWindow_ = nullptr;
      });
  
      mdiArea_->addSubWindow(listMdiSubWindow_);
      listMdiSubWindow_->adjustSize();
      listMdiSubWindow_->show();
  
      listWindow_->reload();
  }
  
  void <Entity>Controller::closeAllWindows() {
      BOOST_LOG_SEV(lg(), debug) << "closeAllWindows called";
  
      // Close all managed windows
      QList<QString> keys = managed_windows_.keys();
      for (const QString& key : keys) {
          if (auto* window = managed_windows_.value(key)) {
              window->close();
          }
      }
      managed_windows_.clear();
  
      listWindow_ = nullptr;
      listMdiSubWindow_ = nullptr;
  }
  
  void <Entity>Controller::reloadListWindow() {
      if (listWindow_) {
          listWindow_->reload();
      }
  }
  

• Showing detail and history windows
  

  Use the show_managed_window helper from EntityController to present detail and history windows. This helper handles adding to MDI, removing the maximize button, sizing, and detaching if the list window is detached:

  void <Entity>Controller::showDetailWindow(
      const <component>::domain::<entity>* entity,
      bool createMode, bool readOnly, int versionNumber) {
  
      const QString windowKey = build_window_key("details",
          entity ? QString::fromStdString(entity->identifier()) : "new");
  
      if (try_reuse_window(windowKey)) {
          return;
      }
  
      auto* detailDialog = new <Entity>DetailDialog(mainWindow_);
      detailDialog->setClientManager(clientManager_);
      detailDialog->setChangeReasonCache(changeReasonCache_);
      detailDialog->setUsername(username_.toStdString());
      detailDialog->setCreateMode(createMode);
      if (entity) {
          detailDialog->set<Entity>(*entity);
      }
  
      // Connect status/error signals
      connect(detailDialog, &<Entity>DetailDialog::statusMessage,
              this, &<Entity>Controller::statusMessage);
      connect(detailDialog, &<Entity>DetailDialog::errorMessage,
              this, &<Entity>Controller::errorMessage);
  
      // Connect entity-specific signals - use handleEntitySaved/handleEntityDeleted
      // for centralized reload control. Use QPointer for safety in lambda captures.
      connect(detailDialog, &<Entity>DetailDialog::<entity>Saved,
              this, [self = QPointer<<Entity>Controller>(this)](const QString& id) {
          if (!self) return;
          BOOST_LOG_SEV(lg(), info) << "<Entity> saved: " << id.toStdString();
          self->handleEntitySaved();  // Respects autoReloadOnSave_ flag
      });
      connect(detailDialog, &<Entity>DetailDialog::<entity>Deleted,
              this, [self = QPointer<<Entity>Controller>(this), windowKey](const QString& id) {
          if (!self) return;
          BOOST_LOG_SEV(lg(), info) << "<Entity> deleted: " << id.toStdString();
          self->handleEntityDeleted();  // Respects autoReloadOnSave_ flag
      });
  
      auto* detailWindow = new DetachableMdiSubWindow(mainWindow_);
      detailWindow->setAttribute(Qt::WA_DeleteOnClose);
      detailWindow->setWidget(detailDialog);
      detailWindow->setWindowTitle(createMode ? tr("New <Entity>")
          : tr("<Entity>: %1").arg(/* identifier */));
      detailWindow->setWindowIcon(/* ... */);
  
      register_detachable_window(detailWindow);
  
      connect(detailWindow, &QObject::destroyed, this,
              [self = QPointer<<Entity>Controller>(this), windowKey]() {
          if (!self) return;
          self->managed_windows_.remove(windowKey);
      });
  
      managed_windows_[windowKey] = detailWindow;
  
      // Wire dialog close signal to window close
      connect_dialog_close(detailDialog, detailWindow);
  
      // Use the helper to show the window (handles MDI add, sizing, detach)
      show_managed_window(detailWindow, listMdiSubWindow_);
  }
  

  The handleEntitySaved() and handleEntityDeleted() methods are defined in EntityController and respect the autoReloadOnSave_ flag. By default, auto-reload is disabled. Controllers should NOT call listWindow_->reload() directly; instead, use these centralized methods for consistent behavior.

  The show_managed_window method signature:

  void show_managed_window(DetachableMdiSubWindow* window,
      DetachableMdiSubWindow* referenceWindow = nullptr,
      QPoint offset = QPoint(30, 30));
  

  • window: The window to show
  • referenceWindow: Optional window to follow detach state from (typically listWindow_)
  • offset: Position offset when detaching (default 30,30, use 60,60 for nested windows)
• QPointer safety in lambda captures
  

  When using lambdas in Qt connect() calls, always use QPointer to safely capture this. This prevents crashes if the controller is destroyed while a signal is still pending:

  // CORRECT: Use QPointer for safety
  connect(sender, &Sender::signal, this,
          [self = QPointer<MyController>(this)](const QString& arg) {
      if (!self) return;  // Guard against destroyed controller
      BOOST_LOG_SEV(lg(), info) << "Signal received";
      self->handleSomething();
      emit self->statusMessage("Done");
  });
  
  // WRONG: Raw this capture can crash if controller is destroyed
  connect(sender, &Sender::signal, this, [this](const QString& arg) {
      handleSomething();  // Crash if 'this' was deleted!
  });
  

  Rules for QPointer usage:

  1. Replace [this] with [self = QPointer<ControllerClass>(this)]
  2. For additional captures: [self = QPointer<...>(this), key, otherVar]
  3. Add if (!self) return; as the first line in the lambda
  4. Replace this-> with self->
  5. Replace bare member access (member_) with self->member_
  6. Replace emit signal(...) with emit self->signal(...)
• Notification handling (automatic via base class)
  

  Notification handling is automatic when you:

  1. Pass the event name to the EntityController base class constructor
  2. Override listWindow() to return your list window

  The base class EntityController::onNotificationReceived():

  • Filters notifications by the event name you provided
  • Calls listWindow()->markAsStale() when matching notifications arrive
  • Logs the notification receipt

  No additional code is needed in derived controllers for basic stale marking.

Commit message

[qt] Add <Entity>Controller for <entity> window management

Create controller with list window, detail dialogs, history dialogs,
and server notification handling.

Files to modify

Header changes

// Forward declaration
class <Entity>Controller;

// Member variable
<Entity>Controller* <entity>Controller_;

UI changes

Implementation changes

// Create controller — pass changeReasonCache_ so dialogs can show
// the change reason dialog before save (amend) and delete.
<entity>Controller_ = new <Entity>Controller(
    this, mdiArea_, clientManager_, username_, changeReasonCache_, this);

// Connect signals from controller to MainWindow
connect(<entity>Controller_, &<Entity>Controller::detachableWindowCreated,
        this, &MainWindow::onDetachableWindowCreated);
connect(<entity>Controller_, &<Entity>Controller::detachableWindowDestroyed,
        this, &MainWindow::onDetachableWindowDestroyed);

// Connect signals
connect(<entity>Controller_, &<Entity>Controller::statusMessage,
        this, [this](const QString& msg) {
            ui_->statusbar->showMessage(msg, 5000);
        });
connect(<entity>Controller_, &<Entity>Controller::errorMessage,
        this, [this](const QString& err) {
            ui_->statusbar->showMessage(err, 5000);
        });

// Connect menu action
connect(ui_->Action<Entity>s, &QAction::triggered,
        <entity>Controller_, &<Entity>Controller::showListWindow);

// Set menu icon (using icon-guidelines skill for selection)
ui_->Action<Entity>s->setIcon(IconUtils::createRecoloredIcon(
    ":/icons/ic_fluent_<icon>_20_regular.svg", iconColor));

// Enable/disable based on connection state
ui_->Action<Entity>s->setEnabled(isConnected);

Commit message

[qt] Integrate <Entity>Controller into MainWindow

Add menu action and controller for <entity> management in main window.

Files to update

Classes to add

Relationships to show

Commit message

[qt] Update UML diagrams for <Entity> components

Add class diagrams for Client<Entity>Model, <Entity>MdiWindow,
<Entity>DetailDialog, <Entity>HistoryDialog, and <Entity>Controller.

Item delegates must reference the model's Column enum

#include "ores.qt/Client<Entity>Model.hpp"

namespace ores::qt {

using Column = Client<Entity>Model::Column;

void <Entity>ItemDelegate::paint(QPainter* painter,
    const QStyleOptionViewItem& option,
    const QModelIndex& index) const {

    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index);

    // CORRECT: Use enum values for column checks
    if (index.column() == Column::Status) {
        drawBadge(painter, opt.rect, /* ... */);
        return;
    }

    switch (index.column()) {
        case Column::Name:
            opt.displayAlignment = Qt::AlignLeft | Qt::AlignVCenter;
            break;
        case Column::Version:
            opt.font = monospaceFont_;
            opt.displayAlignment = Qt::AlignCenter;
            break;
        // ...
    }
}

// WRONG: These go stale when the model's Column enum changes.
constexpr int status_column_index = 2;
constexpr int locked_column_index = 3;

Badge colors for item delegates

#include "ores.qt/ColorConstants.hpp"

// In delegate implementation:
using bc = badge_colors;

// Boolean/enabled states
bc::enabled   // Green for enabled/yes/active
bc::disabled  // Gray for disabled/no/inactive
bc::yes       // Alias for enabled
bc::no        // Alias for disabled

// Status indicators
bc::online    // Green for online
bc::recent    // Blue for recent activity
bc::old       // Amber for old/stale
bc::never     // Gray for never
bc::locked    // Red for locked
bc::unlocked  // Gray for unlocked

// Data quality dimensions
bc::origin_primary, bc::origin_derived
bc::nature_actual, bc::nature_estimated, bc::nature_simulated
bc::treatment_raw, bc::treatment_cleaned, bc::treatment_enriched

// Common text color
bc::text      // White (255, 255, 255)
bc::default_bg // Gray fallback

Badge font scaling

void MyItemDelegate::paint(QPainter* painter,
    const QStyleOptionViewItem& option,
    const QModelIndex& index) const {
    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index);

    // Derive badge font from view font
    QFont badgeFont = opt.font;
    badgeFont.setPointSize(qRound(badgeFont.pointSize() * 0.8));
    badgeFont.setBold(true);

    // Pass font to badge drawing helper
    drawBadge(painter, rect, text, bgColor, badge_colors::text, badgeFont);
}

Adding external data to LookupFetcher

// In LookupFetcher.hpp:
std::unordered_map<std::string, std::string>
fetch_business_centre_image_map(ClientManager* cm);

// In LookupFetcher.cpp:
std::unordered_map<std::string, std::string>
fetch_business_centre_image_map(ClientManager* cm) {
    std::unordered_map<std::string, std::string> mapping;
    if (!cm) return mapping;

    refdata::messaging::get_business_centres_request request;
    request.limit = 1000;
    auto response = cm->process_authenticated_request(std::move(request));
    if (response) {
        for (const auto& bc : response->business_centres) {
            std::string image_id_str;
            if (bc.image_id)
                image_id_str = boost::uuids::to_string(*bc.image_id);
            mapping.emplace(bc.code, std::move(image_id_str));
        }
    }
    return mapping;
}

Using external data in detail dialog combo boxes

self->ui_->businessCenterCombo->clear();
for (const auto& code : result.business_centre_codes) {
    self->ui_->businessCenterCombo->addItem(QString::fromStdString(code));
}

Using external data in list model columns

void Client<Entity>Model::fetch_external_data() {
    if (!clientManager_ || !clientManager_->isConnected())
        return;

    using MapType = std::unordered_map<std::string, std::string>;
    QPointer<Client<Entity>Model> self = this;

    auto* watcher = new QFutureWatcher<MapType>(this);
    connect(watcher, &QFutureWatcher<MapType>::finished,
            this, [self, watcher]() {
        auto mapping = watcher->result();
        watcher->deleteLater();
        if (!self || mapping.empty())
            return;

        self->code_to_value_ = std::move(mapping);

        if (!self->entries_.empty()) {
            emit self->dataChanged(self->index(0, TargetColumn),
                self->index(self->rowCount() - 1, TargetColumn),
                {Qt::DecorationRole});
        }
    });

    watcher->setFuture(QtConcurrent::run(
        [cm = clientManager_]() { return fetch_the_shared_function(cm); }));
}