Added a ModelItem class to hold the data for each row.

model/modelitem.h

@@ -0,0 +1,18 @@
+#ifndef MODELITEM_H
+#define MODELITEM_H
+
+#include <QVariant>
+
+class ModelItem {
+ public:
+  ModelItem(const QHash<int, QVariant> values);
+
+  QVariant data(int role) const;
+
+  bool setData(const QVariant& value, int role);
+
+ private:
+  QHash<int, QVariant> m_values;
+};
+
+#endif  // MODELITEM_H