Add enum for model columns

GnuPG-bug-id: 5245

src/models/useridlistmodel.cpp

@@ -127,15 +127,17 @@ public:
 
     QVariant toolTip(int column) const
     {
-        if (column == 5 /*Status*/) {
-            return i18n("class %1", mSig.certClass());
+        if (!mSig.isNull()) {
+            if (column == static_cast<int>(UserIDListModel::Column::Status)) {
+                return i18n("class %1", mSig.certClass());
+            }
         }
         return mItemData.value(column);
     }
 
     QVariant icon(int column) const
     {
-        if (!mSig.isNull() && column == 5 /*Status*/) {
+        if (!mSig.isNull() && column == static_cast<int>(UserIDListModel::Column::Status)) {
             return Formatting::validityIcon(mSig);
         }
         return QVariant();

src/models/useridlistmodel.h

@@ -27,6 +27,17 @@ class KLEO_EXPORT UserIDListModel : public QAbstractItemModel
 {
     Q_OBJECT
 public:
+    enum class Column {
+        Id,
+        Name,
+        Email,
+        ValidFrom,
+        ValidUntil,
+        Status,
+        Exportable,
+        Tags,
+    };
+
     explicit UserIDListModel(QObject *parent = nullptr);
     ~UserIDListModel() override;