[components] Downgrade enum class Role to plain enum

We should better align this model class with SDDM::UserModel to reduce
confusion. Enum classes might be better for some tasks, but they aren't
widely used for Qt model roles, and they require extra casts without
added safety benefits.

components/sessionsprivate/sessionsmodel.cpp

@@ -230,20 +230,20 @@ QVariant SessionsModel::data(const QModelIndex &index, int role) const
     }
 
     if (index.row() == m_data.count()) {
-        switch (static_cast<Role>(role)) {
-        case Role::RealName:
+        switch (role) {
+        case RealNameRole:
             return i18n("New Session");
-        case Role::IconName:
+        case IconNameRole:
             return QStringLiteral("system-switch-user");
-        case Role::Name:
+        case NameRole:
             return i18n("New Session");
-        case Role::DisplayNumber:
+        case DisplayNumberRole:
             return 0; // NA
-        case Role::VtNumber:
+        case VtNumberRole:
             return -1; // an invalid VtNumber - which we'll use to indicate it's to start a new session
-        case Role::Session:
+        case SessionRole:
             return 0; // NA
-        case Role::IsTty:
+        case IsTtyRole:
             return false; // NA
         default:
             return QVariant();
@@ -252,20 +252,20 @@ QVariant SessionsModel::data(const QModelIndex &index, int role) const
 
     const SessionEntry &item = m_data.at(index.row());
 
-    switch (static_cast<Role>(role)) {
-    case Role::RealName:
+    switch (role) {
+    case RealNameRole:
         return item.realName;
-    case Role::Icon:
+    case IconRole:
         return item.icon;
-    case Role::Name:
+    case NameRole:
         return item.name;
-    case Role::DisplayNumber:
+    case DisplayNumberRole:
         return item.displayNumber;
-    case Role::VtNumber:
+    case VtNumberRole:
         return item.vtNumber;
-    case Role::Session:
+    case SessionRole:
         return item.session;
-    case Role::IsTty:
+    case IsTtyRole:
         return item.isTty;
     default:
         return QVariant();
@@ -280,14 +280,16 @@ int SessionsModel::rowCount(const QModelIndex &parent) const
 
 QHash<int, QByteArray> SessionsModel::roleNames() const
 {
-    return {
-        {static_cast<int>(Role::Name), QByteArrayLiteral("name")},
-        {static_cast<int>(Role::RealName), QByteArrayLiteral("realName")},
-        {static_cast<int>(Role::Icon), QByteArrayLiteral("icon")},
-        {static_cast<int>(Role::IconName), QByteArrayLiteral("iconName")},
-        {static_cast<int>(Role::DisplayNumber), QByteArrayLiteral("displayNumber")},
-        {static_cast<int>(Role::VtNumber), QByteArrayLiteral("vtNumber")},
-        {static_cast<int>(Role::Session), QByteArrayLiteral("session")},
-        {static_cast<int>(Role::IsTty), QByteArrayLiteral("isTty")},
-    };
+    QHash<int, QByteArray> roleNames;
+
+    roleNames[NameRole] = QByteArrayLiteral("name");
+    roleNames[RealNameRole] = QByteArrayLiteral("realName");
+    roleNames[IconRole] = QByteArrayLiteral("icon");
+    roleNames[IconNameRole] = QByteArrayLiteral("iconName");
+    roleNames[DisplayNumberRole] = QByteArrayLiteral("displayNumber");
+    roleNames[VtNumberRole] = QByteArrayLiteral("vtNumber");
+    roleNames[SessionRole] = QByteArrayLiteral("session");
+    roleNames[IsTtyRole] = QByteArrayLiteral("isTty");
+
+    return roleNames;
 }

components/sessionsprivate/sessionsmodel.h

@@ -50,16 +50,17 @@ public:
     explicit SessionsModel(QObject *parent = nullptr);
     ~SessionsModel() override = default;
 
-    enum class Role {
-        RealName = Qt::DisplayRole,
-        Icon = Qt::DecorationRole, // path to a file
-        Name = Qt::UserRole + 1,
-        DisplayNumber,
-        VtNumber,
-        Session,
-        IsTty,
-        IconName, // name of an icon
+    enum UserRoles {
+        RealNameRole = Qt::DisplayRole,
+        IconRole = Qt::DecorationRole, // path to a file
+        NameRole = Qt::UserRole + 1,
+        DisplayNumberRole,
+        VtNumberRole,
+        SessionRole,
+        IsTtyRole,
+        IconNameRole, // name of an icon
     };
+    Q_ENUM(UserRoles)
 
     bool canSwitchUser() const;
     bool canStartNewSession() const;