Added a ToStringRole to summarize the model items (for tool tip and QR code).

model/metadata.h

@@ -7,7 +7,15 @@
 #include <QString>
 
 /// model data
-enum UserRoles { NameRole = Qt::UserRole + 1, DescriptionRole, InfoRole, AmountRole, FactorRole };
+enum UserRoles {
+  NameRole = Qt::UserRole + 1,
+  DescriptionRole,
+  InfoRole,
+  AmountRole,
+  FactorRole,
+  /// helper roles
+  ToStringRole
+};
 static UserRoles DEFAULT_ROLE             = NameRole;
 static QList<UserRoles> USER_FACING_ROLES = {NameRole, DescriptionRole, InfoRole, AmountRole,
                                              FactorRole};

model/modelitem.cpp

@@ -44,6 +44,20 @@ bool ModelItem::setItemData(const QMap<int, QVariant>& changedValues) {
   return valueChanged;
 }
 
+QString ModelItem::toString() const {
+  QString result;
+
+  QListIterator<UserRoles> i(USER_FACING_ROLES);
+  while (i.hasNext()) {
+    const UserRoles role   = i.next();
+    const QString roleName = ROLE_NAMES.value(role);
+    const QVariant value   = data(role);
+    // result.append(value.toString());
+    result.append(QString("%1: %2\n").arg(roleName, data(role).toString()));
+  }
+  return result;
+}
+
 QJsonObject ModelItem::toJsonObject() const {
   QJsonObject itemObject;
   // TODO add UUID and dates (entry, modification, end)

model/modelitem.h

@@ -14,7 +14,7 @@ class ModelItem {
   // TODO change return value to list of changed roles
   bool setItemData(const QMap<int, QVariant>& changedValues);
 
-  // QString toString() const;
+  QString toString() const;
   QJsonObject toJsonObject() const;
 
  private:

model/tablemodel.cpp

@@ -76,6 +76,8 @@ QVariant TableModel::data(const QModelIndex& index, int role) const {
     case AmountRole:
     case FactorRole:
       return m_items.at(row)->data(role);
+    case ToStringRole:
+      return m_items.at(row)->toString();
   }
 
   return QVariant();