roles: add ObjectType role and enum

This is to simplify client and LRC logic when working with
models which store objects of multiple types.

Issue: #81198
Change-Id: Ibae1f96f8d2ceb25cae5fb7c9974f77a612707d0

src/itemdataroles.h

@@ -36,6 +36,7 @@ enum class Role
 {
     DisplayRole        = Qt::DisplayRole ,
     Object             = Qt::UserRole + 1,
+    ObjectType         ,
     Name               ,
     Number             ,
     LastUsed           ,
@@ -45,4 +46,20 @@ enum class Role
     DropState          ,
     UserRole           = Qt::UserRole + 100  // this should always be the last role in the list
 };
+
+/**
+ * All LRC models that store more than one type of class (eg: RecentModel) should return a member of
+ * this enum when ::data(Ring::Role::ObjectType) is called on one of their indeces. This is to
+ * simplify LRC and client logic by not having to dynamic_cast the pointer stored in the index.
+ */
+enum class ObjectType
+{
+    Person,
+    ContactMethod,
+    Call,
+    Media,
+};
+
 } // namespace Ring
+
+Q_DECLARE_METATYPE(Ring::ObjectType)